E89627
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Low Voltage Expert Guides
N° 8
LV generator
protection
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Get more with the world’s Power & Control specialist
Contents
The Generator Set and Electrical Distribution
3
1.1. The 2 applications
1.1.1. Replacement energy
1.1.2. Energy production
4
4
6
1.2. Quality Energy
8
1.3. Services to be provided
10
The Generator Set application in LV
12
2.1. Choice of HV or LV system
12
2.2. Transfer device
2.2.1. Layout of feeders
2.2.2. Sequence
13
13
14
Protection and Monitoring of a LV Generator Set
16
3.1. Generator protection
3.1.1. Overload protection
3.1.2. Short-circuit current protection
15
16
16
3.2. Downstream LV network protection
3.2.1. Priority circuit protection
3.2.2. Safety of persons
18
19
19
3.3. The monitoring functions
3.3.1. Capacitor banks
3.3.2. Motor restart and re-acceleration
3.3.3. Non-linear loads - Example of a UPS
19
20
20
21
3.4. Generator Set parallel connection
3.4.1. Parallel operation
3.4.2. Grounding a parallel-connected Generator Set
25
25
26
3.5. The installation standards
3.5.1. Power definition
3.5.2. Safety standard requirements
27
27
27
The Schneider protection solution
29
4 .1. Micrologic and generator protection
4.1.1. Long Time Delay protection of the “Inverse Definite Minimum
Time Lag” type of phases (3)
4.1.2. Generator protection
29
29
30
4.2. Micrologic P & H for generator monitoring
4.2.1. Implementation
4.2.2. The monitoring functions
31
31
31
4.3. Micrologic for insulation fault protection
4.3.1. The ground protection
4.3.2. Residual current device (RCD) protection
38
38
39
Summary
40
5.1. Diagram
40
5.2. Comments
41
5.3. Summary
42
"Additional technical informations" chapter
43
1
2
In short
Generator Sets (GS) are used in HV
and LV electrical distribution.
In LV they are used as:
b replacement source
b safety source
b sometimes as a Production
Source.
When the need for Energy Quality is
essential, the Generator Set is
associated with an Uninterruptible
Power Supply (UPS).
The Generator Set and
Electrical Distribution
Users’ LV electrical distribution is normally supplied by an electrical utility by
means of HV/MV and MV/LV voltage transformers.
To ensure better continuity of the electricity supply, the user can implement a
direct supply from an independent thermal source (Generator Set or GS) as a
Replacement source. On isolated sites or for economic reasons, he can use this
energy source as the Main source.
This Generator Set mainly consists of:
b a thermal motor
b a generator converting this mechanical energy into electrical energy
b an electrical cubicle performing the excitation regulation and control/monitoring
functions of the various Generator Set components (thermal and electrical).
Generator Set installation must conform to installation rules and satisfy the safety
regulations applicable to the premises on which they are installed or to the
equipment that they are intended to supply.
The Protection Plan and Monitoring
of downstream LV distribution must
be defined specifically taking the
generator characteristics into
account.
3
The Generator Set and
Electrical Distribution
1.1. The 2 applications
According to the application - Main electrical power supply source (Production
Set) or Replacement source of the Main source - the sizing characteristics of the
Generator Sets vary (power, output voltage, MV or LV generator, etc.).
1.1.1. Replacement energy
Principle
As a Replacement source, the Generator Set operates only should the mains
supply fail.
Mains failure can be due to:
b a random cause: fault on the network
b a voluntary cause: placing the network out of operation for maintenance
purposes.
E79478E
Operation
In the Replacement source function, the Generator Set supplies the loads via a
source changeover switch.
As operation is exceptional, the Generator Set is sized strictly to supply the
power P required. The power of these Generator Sets is rarely greater than an
MVA. The power of the Replacement source LV Generator Sets ranges typically
from 250 to 800 kVA.
MV
Main
source
LV
GS
NC
NC: normally closed.
NO: normally open.
Figure 1: Replacement source GS.
4
NO
Replacement
source
E79354E
Implementation
The Generator Sets normally operate independently without connection to the
mains supply, but can be connected if necessary (parallel-connected Generator
Set) in the case of high power requirements.
MV
MV
GS
LV
LV
NC
NC
GS
NC
NC: normally closed.
NO: normally open.
Figure 2: Block diagram of a high power LV replacement GS.
5
The Generator Set and
Electrical Distribution
1.1.2. Energy production
Principle
The Generator Set operates in the “Main” operating mode: it must be able to
withstand operating overloads:
b one hour overload
b one hour overload every 12 hours (Prime Power)
For example: independent energy production for a cement works.
Operation
Powers are normally high or very high (up to several tens of MVA).
Note 1: The production source Set can be LV - if it is low or medium power - and
directly supply a LV/MV step-up transformer. In this case, we can consider that
the Generator Set management functions, excluding generator protection, are at
MV level (Generator Set + MV/LV transformer global function).
E79352E
HV
NC
LV
GS
HV
busbar
LV
NC: normally closed.
NO: normally open.
Figure 3: Block diagram of a LV production GS with step-up transformer.
6
E79355E
Note 2: If there is an MV Set in Production, it may be useful to have one or more
Replacement Sets in LV according to network typology (maintenance of network,
Production Set, MV fault, etc.) (maintenance du réseau, du Groupe de
Production, défaut HTA, ...).
MV production set
GS
LV replacement set
GS
LV
NC
GS
LV
NC
NC
NC: normally closed.
NO: normally open.
64060si
Figure 4: Block diagram of an MV production GS with LV replacement GS.
7
In short
The Generator Set and
Electrical Distribution
1.2. Quality Energy
To supply sensitive loads (computer, etc.), a quality energy must be implemented
that is free from breaking and with a perfectly regulated voltage.
A number of systems can be used to ensure break-free switching. These
systems are implemented in the LV system:
b reversible synchronous machine
the Set generator is permanently connected to the mains supply:
v when operating in the Main function, it operates as a synchronous motor driving
its inertia flywheel
v when operating in the Replacement function. When the Mains supply fails, the
synchronous machine, driven by its flywheel, starts to operate as a generator.
The Set’s thermal motor starts (off-load) and automatically connects as soon as it
reaches its speed at the generator.
When the Main source is restored, the Set is then synchronised on the Main
source, the Main source circuit-breaker closes and the thermal motor is
disengaged and stopped.
Replacement Set or Safety Set.
The same functions are required:
ensure continuity of the electrical
supply should the main source fail.
However, a Safety Set must satisfy
far more exacting operating
requirements in order to guarantee
safety of the electrical installation at
all costs.
E79357E
Electrical utility network
SN
main
source
Synchronous
machine
(compensator
or generator)
Magnetic
coupling
Flywheel
NC
Non-backed up
feeders
Thermal
motor
NC
Backed up
feeders
NC: normally closed.
NO: normally open.
Figure 5: Block diagram of a reversible synchronous machine.
This type of solution is not very common as it is relatively expensive to
implement.
b generator Set associated with a UPS
the generator set ensures continuity of the electrical supply. Electrical supply
involves breaking (from a few minutes to a few seconds). Energy Quality
(elimination of outages/brownouts and waveform) is obtained by an
Uninterruptible Power Supply (UPS) - equipped with a battery- which continually
supplies sensitive loads in LV.
This type of solution is advantageous as it provides sensitive loads with quality
energy during use on a Main or Replacement source.
8
E79360E
Electrical utility
HV incomer
NC
Mains 1
feeder
Mains 2
feeder
Non-sensitive
load
Uninterruptible
power supply
Sensitive feeders
NC: normally closed.
NO: normally open.
Figure 6: Replacement GS and UPS.
Note: for very sensitive applications, should the UPS stop, the operator can ask
not to be switched to the MS in operation on Generator Set. In this case the MS is
replaced by a redundant UPS.
This system is naturally compulsory if frequency of the upstream (source) and
downstream (application) networks is different (for example source in 50 Hz,
application in 60 Hz).
9
The Generator Set and
Electrical Distribution
1.3. Services to be provided
According to the choice of customer or the type of risk anticipated, the Generator
Set is defined in priority as:
E79361E
Safety Source only
A separate Set manages the Replacement Source function. Safety regulations,
mainly concerning buildings open to the general public such as hospitals, public
buildings, etc. define in detail electrical distribution for safety equipment
(emergency lighting, fume extraction, etc.).
These regulations aim at:
b providing fire protection (defective main source, supply of extinguishing means)
b evacuating people in the best possible conditions (emergency lighting,
evacuation path, elevator supply, etc.).
The Safety Set only supplies the loads necessary for the Safety function.
Electrical safety supply
Replacement
source
Safety
source
Main
source
GS
NC
NC
Safety
switchboard
NC
Main safety
switchboard
Safety
Main
NC
Semi-lighting
1
Fumes extraction, elevator,
water supply, telecommunication,
other specific equipment
Semi-lighting
2
Other
installation
Safety
Main or replacement
NC: normally closed.
NO: normally open.
Figure 7: Block diagram of an installation with a replacement GS and a safety GS.
Note: the various switches can be replaced by circuit-breakers if required by
their need for protection.
10
Replacement Source
The Set’s purpose is to perform process controlled shutdown correctly. The
“energy quality” function, if necessary, is taken into account thanks to supplying
of sensitive loads via an Uninterruptible Power Supply (UPS) downstream from
the Set.
The Set can be specifically dedicated to the Replacement source function, but it
is allowed to operate as a Safety source if the specific Safety function
requirements are fully satisfied: for example maximum time of 10 s to obtain
voltage and frequency.
This allows more frequent operation of these Sets and thus allows them to be
more operational if necessary.
Autonomous Production Source
As a rule the set is implemented:
b to supply electrical power at lesser cost (isolated site)
b to guard against serious long-term energy downtime risks (areas with seismic
risks, etc.).
11
In short
A LV Generator Set normally has a
power of less than 2 500 kVA: the
typical value is around 800 kVA.
The LV Generator Set is mainly
used as a replacement and/or
safety source. The main source is
switched to the replacement source:
b with load-shedding of non-priority
loads
b by means of an automatic source
changeover switch controlled by
voltage.
The Generator Set
Application in LV
2.1. Choice of HV or LV system
Supply voltage is chosen mainly with respect to Generator Set power
requirements.
Generator Set as HV source
The Generator Set is normally a generator activated by a diesel motor or a gas
turbine.
The production Set application, requiring high installed powers, is thus normally
carried out using the MV system.
Generator Set as LV source
The Generator Set is normally a generator activated by a diesel motor.
The following table summarises the system choice criteria:
criteria
LV
HV
comments
power
< 2500 kVA
> 2500 kVA
facility
+++
+
regulations
++
LV Generator Set applications
LV Generator Sets are mainly used:
b to supply safety equipment
b to replace the Main source
b to supply temporary installations
The sectors of activity where it is necessary to have a Replacement and/or
Safety source, are very vast ranging from Tertiary to Industry.
The following table lists the main application sectors:
tertiary
hospitals
computer Centre (bank, etc.)
public building
12
industrial
process,
cement works (furnace
motor), …
2.2. Transfer device
It is interesting to make the source transfer (or source switching) device using
standard switchgear, adding specific features. Thus the devices will be:
b withdrawable for easier maintenance
b electrically and mechanically locked
For implementation, the distribution architecture and transfer sequence must be
studied.
2.2.1. Layout of feeders
As a rule it is not necessary to back up the entire installation. An economic
measure is to size the Generator Set for supply of the priority feeders only.
For example: sizing the Generator Set at 700 kW for a LV distribution of 2000 kVA
(only one third of feeders are considered priority).
Transfer of load supply to the replacement source can be considered in 2 ways.
Transfer with load-shedding of non-priority loads
Priority and non-priority loads are not specifically grouped: management (loadshedding) of loads must be performed by a dedicated automation device or relay.
This configuration type requires a management auxiliary but is easier to modify or
upgrade.
E79353E
MV
LV
Main LV board
GS
NC
Loadshedding
Non-priority
Priority
NC: normally closed.
NO: normally open.
Figure 8: Management of priorities by load-shedding.
13
The Generator Set
Application in LV
E79356E
Transfer for priority feeders only
Priority feeders are directly grouped at a specific busbar in this system. This
system requires no management auxiliaries.
Source 1
MV
GS
LV
NC
NC
D1
NO
D2
Main/Standby
Non-priority circuits
NC: normally closed.
NO: normally open.
Figure 9: Management of priorities by grouping.
14
Priority circuits
2.2.2. Sequence
E88044E
E88045E
Main source / Generator Set transfer
Transfer generally takes place with a short break (a few seconds) the time
required to start the Generator Set and to switch over:
b switching to Generator Set sequence
v loss of mains voltage at TA
- load-shedding of non-priority feeders (if necessary) and important feeders
v after time delay starting of Generator Set at TB
v on appearance of Generator Set voltage at TC
- opening of Main source circuit-breaker
v closing of Replacement source circuit-breaker (Generator Set) at T D
v sequenced restoration of important feeders
b switching to Main source sequence
v restoration of mains voltage at TA
v after time delay at T'B
- opening of Replacement source circuit-breaker
- restoration of non-priority feeders
v closing of Main source circuit-breaker at T'C
v stopping of Generator Set at T'D.
Main
Non-priority
Figure 10: Block diagram.
Replacement
Main
Priority
Figure 11: Type 3 chronogram.
Transfer of loads on the Generator Set, the Replacement source, implies
consideration of the generator’s specific characteristics. This takes the form of an
additional study concerning:
b the protection plan (setting and discrimination)
b load management (putting back into operation)
b supply of sensitive and non-linear loads
In addition, to ensure optimised operation and maintenance, it is important to
implement additional monitoring and supervision functions (frequency and voltage
monitoring, phase unbalance, etc.).
Note: return to the Main source can be performed using a synchrocoupler to
ensure switching without voltage breaking.
15
In short
Protection and Monitoring
of a LV Generator Set
E79476E
The following diagram shows the electrical sizing parameters of a Generator Set.
Pn, Un and In are, respectively, the power of the thermal motor, the rated voltage
and the rated current of the generator.
Thermal
motor
Figure 12: Block diagram of a Generator Set.
Nota 1: Also remember that Generator Set sizing is optimised, i.e. that Pn is
normally around one third of normal installed power.
3.1.1. Overload protection
The generator protection curve must be analysed.
E79364E
A Generator Set has specific
overload and short-circuit withstand
characteristics as a result of the
high generator reactances.
This has the following
consequences:
b for protection of people and
equipment, specific circuit-breaker
settings providing both protection of
the installation set and coordination with the downstream
protection devices.
b for proper operation on duty of the
monitoring functions preventing
malfunctions and ensuring alarm
management if necessary in event
of:
v non-linear loads (harmonics)
v loads with a high energising
current (motors, LV/LV transformers,
etc.)
v parallel-connection of Generator
Sets
v operation in prolonged overload
conditions (Standby Set).
Standards specify the specific
power available according to the
type of application of a Generator
Set - production, transfer, standby.
3.1. Generator protection
Overloads
Figure 13: Example of an overload curve T=f(I).
Standards and requirements of applications can also stipulate specific overload
conditions:
For example:
I / In
1.1
1.5
t
>1h
30 s
The setting possibilities of the overload protection devices (or Long Time
Delay) will closely follow these requirements.
Note on overloads
b for economic reasons, the thermal motor of a Replacement Set may be strictly
sized for its nominal power. If there is an active power overload, the diesel motor
will stall. The active power balance of the priority loads must take this into account
b a production Set must be able to withstand operating overloads:
v one hour overload
v one hour overload every 12 hours (Prime Power).
(see chapter 3.5 “The installation standards”)
16
3.1.2. Short-circuit current protection
3.1.2.1. Making the short-circuit current
The short-circuit current is the sum:
b of an aperiodic current
b of a damped sinusoidal current.
The short-circuit current equation shows that it is made according to three
phases.
E79365E
I rms
1
2
subtransient transient
conditions conditions
3
steady state
conditions
generator with
compound
excitation or
over-excitation
generator with
serial exitation
fault
10 to 20 ms
appears
0.1 to 0.3 s
T (s)
Figure 14: Short-circuit current level during the 3 phases.
Subtransient phase
When a short-circuit appears at the terminals of a generator, the current is first
made at a relatively high value of around 6 to 12 ln during the first cycle
(0 to 20 milliseconds).
The amplitude of the short-circuit output current is defined by three parameters:
b the subtransient reactance of the generator
b the level of excitation prior to the time of the fault and
b the impedance of the faulty circuit.
The short-circuit impedance of the generator to be considered is the subtransient
reactance expressed as a % of Uo (phase-to-neutral voltage) by the
manufacturer x”d. The typical value is 10 to 15 %.
We determine the subtransient short-circuit impedance of the generator:
X"d =
U 2n x"d
where S = 3UNIN.
S 100
Transient phase
The transient phase is placed 100 to 500 ms after the time of the fault. Starting
from the value of the fault current of the subtransient period, the current drops to
1.5 to 2 times the current ln.
The short-circuit impedance to be considered for this period is the transient
reactance expressed as a % Uo by the manufacturer x'd. The typical value is 20
to 30 %.
Steady state phase
The steady state occurs above 500 ms.
When the fault persists, Set output voltage collapses and the exciter regulation
seeks to raise this output voltage. The result is a stabilised sustained short-circuit
current:
b if generator excitation does not increase during a short-circuit (no field overexcitation) but is maintained at the level preceding the fault, the current stabilises
at a value that is given by the synchronous reactance Xd of the generator. The
typical value of xd is greater than 200 %. Consequently, the final current will be
less than the full-load current of the generator, normally around 0.5 ln.
b If the generator is equipped with maximum field excitation (field overriding) or
with compound excitation, the excitation “surge” voltage will cause the fault
current to increase for 10 seconds, normally to 2 to 3 times the full-load current
of the generator.
17
Protection and Monitoring
of a LV Generator Set
3.1.2.2. Calculating the short-circuit current
Manufacturers normally specify the impedance values and time constants
required for analysis of operation in transient or steady state conditions.
Impedance table: Leroy Somer generator
(kVA)
x"d (%)
75
200
400
800
1600
2500
10.5
10.4
12.9
10.5
18.8
19.1
x'd (%)
21
15.6
19.4
18
33.8
30.2
x'd (%)
280
291
358
280
404
292
Resistances are always negligible compared with reactances.
The parameters for the short-circuit current study are:
Value of the short-circuit current at generator terminals
Short-circuit current strength in transient conditions is:
s
or
s
UN is the generator output phase-to-phase voltage (Main source).
Note: this value can be compared with the short-circuit current at the terminals
of a transformer. Thus, for the same power, currents in event of a short-circuit
close to a generator will be 5 to 6 times weaker than those that may occur with a
transformer (main source).
This difference is accentuated further still by the fact that generator set power is
normally less than that of the transformer.
E79474E
Example
MV
GS
LV
NC
NC
Main/standby
Non-priority circuits
Priority circuits
NC: normally closed.
NO: normally open.
Figure 15.
When the LV network is supplied by the Main source 1 of 2000 kA, the shortcircuit current is 42 kA at the main LV board busbar. When the LV network is
supplied by the Replacement Source 2 of 500 kVA with transient reactance of
30 %, the short-circuit current is made at approx. 2.5 kA, i.e. at a value 16 times
weaker than with the Main source.
18
3.2. Downstream LV network protection
3.2.1. Priority circuit protection
Choice of breaking capacity
This must be systematically checked with the characteristics of the main source
(HV/LV transformer).
Choice and setting of the Short Time Delay releases
b subdistribution boards
the ratings of the protection devices for the subdistribution and final distribution
circuits are always lower than Generator Set rated current. Consequently, except
in special cases, conditions are similar to supply by the transformer.
b main LV switchboard
v the sizing of the main feeder protection devices is normally similar to that of the
Generator Set. Setting of the STD must allow for the short-circuit characteristic of
the Generator Set (see 3.1.2.).
v discrimination of protection devices on the priority feeders must be provided in
generator set operation (it can even be compulsory for safety feeders).
It is necessary to check proper staggering of STD setting of the protection
devices of the main feeders with that of the subdistribution protection devices
downstream (normally set for distribution circuits at 10 ln).
Note: when operating on the Generator Set, use of a low sensitivity RCD
enables management of the insulation fault and ensures very simple
discrimination.
3.2.2. Safety of people
In the IT (2nd fault) and TN grounding systems, protection of people against
indirect contacts is provided by the STD protection of circuit-breakers. Their
operation on a fault must be ensured, whether the installation is supplied by the
Main source (Transformer) or by the Replacement source (Generator Set).
Calculating the insulation fault current
Zero-sequence reactance formulated as a % of Uo by the manufacturer x’o.
The typical value is 8 %.
The phase-to-neutral single-phase short-circuit current is given by:
The insulation fault current in the TN system is slightly greater than the threephase fault current: for example, in event of an insulation fault on the system in
the previous example, the insulation fault current is equal to 3 kA.
19
Protection and Monitoring
of a LV Generator Set
3.3. The monitoring functions
Due to the specific characteristics of the generator and its regulation, the proper
operating parameters of the Generator Set must be monitored when special
loads are implemented.
The behaviour of the generator is different from that of the transformer:
b the active power it supplies is optimised for a power factor = 0.8
b at less than power factor 0.8, the generator may, by increased excitation,
supply part of the reactive power.
3.3.1. Capacitor bank
An off-load generator connected to a capacitor bank may self-arc, consequently
increasing its overvoltage.
The capacitor banks used for power factor regulation must therefore be
disconnected. This operation can be performed by sending the stopping setpoint
to the regulator (if it is connected to the system managing the source switchings)
or by opening the circuit-breaker supplying the capacitors.
If capacitors continue to be necessary, do not use regulation of the power factor
relay in this case (incorrect and over-slow setting).
3.3.2. Motor restart and re-acceleration
A generator can supply at most in transient period a current of between 3 and 5
times its nominal current.
A motor absorbs roughly 6 ln for 2 to 20 s during start-up.
If Σ Pmotors is high, simultaneous start-up of loads generates a high pick-up
current that can be damaging: large voltage drop, due to the high value of the
Generator Set transient and subtransient reactances (20 % to 30 %), with a risk
of:
b non-starting of motors
b temperature rise linked to the prolonged starting time due to the voltage drop
b tripping of the thermal protection devices.
Moreover, the network and the actuators are disturbed by the voltage drop.
Application
A generator supplies a set of motors.
Generator short-circuit characteristics: PN = 130 kVA at a power factor of 0.8,
ln = 150 A
X’d = 20 % (for example) hence lsc = 750 A.
b the Σ Pmotors is 45 kW (45 % of generator power)
Calculating voltage drop at start-up:
Σ Motors = 45 kW, lM = 81 A, hence a starting current ld = 480 A for 2 to 20 s.
Voltage drop on the busbar for simultaneous motor starting:
∆U
≈
U
I N- I d
I cc- I N
en %
∆U ≈ 55 %
which is not supportable for motors (failure to start).
b the Σ Pmotors is 20 kW (20 % of generator power)
Calculating voltage drop at start-up:
Σ Motors = 20 kW, lM = 35 A, hence a starting current ld = 210 A for 2 to 20 s.
Voltage drop on the busbar:
∆U
U
≈
I N- I d
I cc- I N
en %
∆U ≈ 10 %
which is supportable but high.
20
E79475E
GS
Remote control 2
Remote control 1
Priority
Priority
motors
resistive loads
Figure 16: Restarting of priority motors (Σ P > 1/3 Pn).
Restarting tips:
b if the Pmax of the largest motor > 1/3 Pn, a progressive starter must be
installed on this motor
b if Σ Pmotors > 1/3 Pn, motor cascade restarting must be managed by a PLC
b if Σ Pmotors < 1/3 Pn, there are no restarting problems.
3.3.3. Non-linear loads - Example of a UPS
Non-linear loads
These are mainly:
b saturated magnetic circuits
b discharge lamps, fluorescent lights
b electronic converters:
v computer processing systems: PC, computers, etc.
v etc.
These loads generate harmonic currents: supplied by a Generator Set, this can
create high voltage distortion due to the low short-circuit power of the generator.
Uninterruptible Power Supply (UPS)
The combination of a UPS and generator set is the best solution for ensuring
quality power supply with long autonomy for the supply of sensitive loads.
It is also a non-linear load due to the input rectifier. On source switching, the
autonomy of the UPS on battery must allow starting and connection of the
Generator Set.
21
E79360E
E89635
Protection and Monitoring
of a LV Generator Set
Electrical utility
HV incomer
NC
Mains 1
feeder
Mains 2
feeder
Uninterruptible
power supply
Non-sensitive
load
Sensitive feeders
Figure 17: GS-UPS combination for Quality Energy.
UPS power
UPS inrush power must allow for:
b nominal power of the downstream loads. This is the sum of the apparent
powers Pa absorbed by each application. Furthermore, so as not to oversize the
installation, the overload capacities at UPS level must be considered (for
example: 1.5 ln for 1 minute and 1.25 ln for 10 minutes).
b the power required to recharge the battery: this current is proportional to the
autonomy required for a given power. The sizing Sr of a UPS is given by:
Sr = 1.17 x Pn.
The table below defines the pick-up currents and protection devices for supplying
the rectifier (Mains 1) and the standby mains (Mains 2).
Table: pick-up currents and protection devices
nominal power
22
current value (A)
Pn
mains 1 with 3Ph battery
400 V - l1
mains 2 or 3Ph application
400 V lu
40 kVA
86
60.5
60 kVA
123
91
80 kVA
158
121
100 kVA
198
151
120 kVA
240
182
160 kVA
317
243
200 kVA
395
304
250 kVA
493
360
300 kVA
590
456
400 kVA
793
608
500 kVA
990
760
600 kVA
1180
912
800 kVA
1648
1215
Short-circuit downstream of a UPS
The UPS use PWM switch mode power supply to reproduce the output voltage.
As a rule their current regulation will limit current to 1.5 times ln. The output filter
will be able to supply for 1/4 of a period loads at 4 or 5 times ln: this may be
sufficient to selectively eliminate short-circuits on small feeders and thus
guarantee continuity of supply.
On the other hand, on large feeders, as current is limited, the short-circuit may
remain steady and the UPS immediately switches to the standby supply source
to increase short-circuit current and ensure tripping of the downstream protection
devices.
E79477E
Generator Set/UPS combination
b restarting the Rectifier on a Generator Set
The UPS rectifier can be equipped with a progressive starting system of the
charger to prevent harmful pick-up currents when installation supply switches to
the Generator Set.
Mains1
GS starting
UPS charger
starting
5 to 10 s
Figure 18: Progressive starting of a type 2 UPS rectifier.
b harmonics and voltage distortion
total voltage distortion t is defined by:
τ(%) =
Uh 2n
Uf
where Uhn is the n order voltage harmonic.
This value depends on:
v the harmonic currents generated by the rectifier (proportional to the power Sr of
the rectifier)
v the longitudinal subtransient reactance X”d of the generator
v the power Sg of the generator.
We define U' Rcc (%) = X"d
SR
the generator relative short-circuit voltage,
SG
brought to rectifier power
i.e. τ = f(U’RCC ).
Note 1: as subtransient reactance is great, harmonic distortion is normally too
high compared with the tolerated value (7 to 8 %) for reasonable economic sizing
of the generator: use of a suitable filter is an appropriate and cost-effective
solution.
Note 2: harmonic distortion is not harmful for the rectifier but may be harmful for
the other loads supplied in parallel on the rectifier.
23
Protection and Monitoring
of a LV Generator Set
Application
A chart is used to find the distortion t as a function of U’RCC
E79366E
(voltage harmonic distortion)
Without filter
With filter
(incorporated)
Figure 19: Chart for calculating type 3 harmonic distortion.
The chart gives:
b either t as a function of U’RCC
b or U’RCC as a function of τ
From which Generator Set sizing, Sg, is determined.
Example
b generator sizing
v 300 kVA UPS without filter, subtransient reactance of 15 %
The power Sr of the rectifier is Sr = 1.17 x 300 kVA = 351 kVA
For a τ < 7 %, the chart gives U’ RCC = 4 %, power Sg is:
15
= 1 400 kVA
4
v 300 kVA UPS with filter, subtransient reactance of 15 %
For τ = 5 %, the calculation gives U’RCC = 12 %, power Sg is:
S G = 351 x
S G = 351 x
15
= 500 kVA
12
Note: with an upstream transformer of 630 kVA on the 300 kVA UPS without filter,
the 5 % ratio would be obtained.
The result is that operation on Generator Set must be continually monitored for
harmonic currents.
If voltage harmonic distortion is too great, use of a filter on the network is the
most effective solution to bring it back to values that can be tolerated by sensitive
loads.
24
Protection and Monitoring
of a LV Generator Set
3.4. Generator Set parallel-connection
Parallel-connection of the Generator Set irrespective of the application type Safety source, Replacement source or Production source - requires finer
management of connection, i.e. additional monitoring functions.
3.4.1. Parallel operation
As Generator Sets generate energy in parallel on the same load, they must be
synchronised properly (voltage, frequency) and load distribution must be
balanced properly. This function is performed by the regulator of each Generator
Set (thermal and excitation regulation). The parameters (frequency, voltage) are
monitored before connection: if the values of these parameters are correct,
connection can take place.
3.4.1.1. Insulation faults
An insulation fault inside the metal casing of a generator set may seriously
damage the generator of this set if the latter resembles a phase-to-neutral shortcircuit. The fault must be detected and eliminated quickly, else the other
generators will generate energy in the fault and trip on overload: installation
continuity of supply will no longer be guaranteed. Ground Fault Protection (GFP)
built into the generator circuit is used to:
b quickly disconnect the faulty generator and preserve continuity of supply
b act at the faulty generator control circuits to stop it and reduce the risk of
damage.
This GFP is of the “Residual sensing” type and must be installed as close as
possible to the protection device as per a TN-C/TN-S* system at each generator
set with grounding of frames by a separate PE.
E51145E
* The system is in TN-C for sets seen as the “generator” and in TN-S for sets seen as “loads”.
generator no. 1
generator no. 2
RS
RS
protected
area
PE
unprotected
area
PE
PEN
PE
PEN
Phases
N
PE
Figure 20.
25
Protection and Monitoring
of a LV Generator Set
3.4.1.2. Generator Set faults as a load
One of the parallel-connected Generator Sets may no longer operate as a
generator but as a motor (by loss of its excitation for example). This may
generate overloading of the other Generator Set(s) and thus place the electrical
installation out of operation.
To check that the Generator Set really is supplying the installation with power
(operation as a generator), you need to check the proper flow direction of energy
on the coupling busbar using a specific “reverse power” check. Should a fault
occur, i.e. the Set operates as a motor, this function will eliminate the faulty Set.
E88015E
MV incomer
GS
HV busbar
SetSet.
LV
E88043E
Figure 21: Energy transfer direction - GS as a generator.
MV incomer
GS
HV busbar
LV
Figure 22: Energy transfer direction - GS as a load.
3.4.2. Grounding parallel-connected Generator Sets
Grounding of connected Generator Sets may lead to circulation of earth fault
currents (3rd order and multiple of 3 harmonics) by connection of Neutrals for
common grounding (grounding system of the TN or TT type). Consequently, to
prevent these currents from flowing between the Generator Sets, we recommend
that you install a decoupling resistance in the grounding circuit.
26
3.5. The installation standards
There are no specific electrical installation rules for Generator Sets performing
Replacement or Production functions.
Continuity of supply requirements must be taken into account for Safety Sets.
For mobile Sets, installation of residual current protection at 30 mA may be
required to guarantee safety of people whatever the connection.
3.5.1. Power definition
The notion of active power delivered is defined by thermal motor sizing. Standard
ISO 3046-1 for diesel motors states three alternatives for defining nominal power
and specifies the overload capacity definition. The notion of power is thus defined
by:
b continuous power
the motor can supply 100 % of its nominal power for an unlimited period of time.
This is the notion used for a Production Set.
b prime Power (PP)
the motor can supply a basic power for an unlimited period of time and 100 % of
nominal power for a specific period of time. Both period and basic power vary
according to the manufacturer. A typical example would be a basic power of 70 %
of nominal power and 100 % of nominal load for 500 hours a year.
Overload capacity: this is defined by 10 % of additional power for 1 hour in a
period of 12 operating hours.
b standby power
this is the maximum power that the machine can deliver over a limited period,
normally less than 500 hours a year. This definition must only be applied to
generator sets operating solely as standby sets. As the motor is not able to
supply greater power, a safety factor of at least 10 % must be applied to
determine necessary standby power. If nominal power is determined by standby
power, there is no more margin left for overload.
Thus, the same diesel set can be defined by:
b a continuous power of 1550 kW
b a prime power PP of 1760 kW and
b a standby power of 1880 kW.
3.5.1.1. Protection device settings
Available power values and tolerated overload times must be considered to
calculate installation sizing and protection device settings. This can be specified
by installation standards.
For example, even if the NEC (National Electrical Code - US Standard in Section
445-4 (a)) does not indicate a precise acceptable overload percentage, the
values normally specified for generator protection range between 100 % and
125 % of generator nominal current at nominal power and at nominal power factor
(typically for 0.8). Moreover, Section 445-4 (a) to (e) EX. allows a 100 %
overshoot of nominal current for more than 60 seconds.
3.5.2. Safety standard requirements
3.5.2.1. Protection device discrimination
In safety terms, electrical installation standards can recommend selective tripping
of protection devices for all circuits supplying equipment:
b safety equipment (fire pump, smoke extraction motor, etc.)
b or for which interruption in energy supply would generate a serious risk.
For example, the NEC requires co-ordination of protection devices for most
elevator supply circuits (Section 620-62). Furthermore, section 4-5-1 of
publication NFPA (1) 1110, Emergency and Stand-by Power Systems, requires
that manufacturers “optimise selective tripping of Short-Circuit Protection
Devices”.
(1) Publication of the National Association of Fire Protection
27
Protection and Monitoring
of a LV Generator Set
3.5.2.2. Alarm processing
A Safety set must never stop, but must supply safety equipment and anti-panic
devices even if this means damage to itself.
On the other hand, safety regulations will require increasingly rigorous preventive
maintenance of the Set to ensure safer operation. Consequently, certain thermal
motor alarms - water temperature, oil temperature, oil level - or generator alarms
- temperature, overloads - must not cause the Safety Set to trip but must be
locked to ensure maintenance or subsequent repairs once installation supply
switches back to the Main Source.
28
In short
Via the Micrologic releases of the
Masterpact and Compact NS circuitbreaker ranges, Schneider has
taken into account the specific
features of the set generators.
These devices perform:
b the essential protection functions
b additional monitoring functions
such as measurement of relevant
proper operation parameters
b connection functions, …
This switchgear guarantees
optimised continuity of supply for
operators.
The Schneider
protection solution
4 .1. Micrologic and generator protection
With respect to generator protection, the Micrologic releases of the Masterpact
NT, NW and Compact NS ranges allow optimised settings for fine generator
protection.
4.1.1. Long Time Delay protection of the “Inverse
Definite Minimum Time Lag” type of phases (3)
The Micrologic P and H include in the microprocessor the various IDMTL type
curves. These curves of variable slope are used to enhance:
b discrimination with fuses placed upstream (HV) of the power circuit-breaker
b co-ordination with the MV protection relays that may be of the IDMTL type
b protection of specific applications.
Five slopes are proposed:
b definite Time DT
b standard inverse time SIT, curve in i0.5t
b very inverse time VIT, curve in it
b extremely inverse time EIT, curve in l2t
b high voltage fuse HVF, curve in i4t
The slope is calculated as per the formula:
(
).
()
Tr =time delay band
B = type of curve DT, SIT, VIT, EIT, HVF
E89636
For the various time delay bands and slopes, the tripping thresholds in seconds
at 1.5 lr are as follows:
time delay
band
DT
SIT
VIT
EIT
0,5 s
1s
2s
4s
8s
12 s
16 s
20 s
24 s
0,5
3,2
5
14
1
6,4
10
28
2
12,9
20
56
4
25,8
40
112
8
51,6
80
224
12
77,4
120
336
16
103
160
448
20
129
200
560
24
155
240
672
HVF
159
319
637
1300
2600
3800
5100
6400
7700
b intermittent overloads and IDMTL slopes
As long as the circuit-breaker remains closed, the intermittent overloads are
taken into account to simulate their effects on the conductors. This function
optimises the circuit-breaker tripping time.
29
The Schneider
protection solution
4.1.2. Generator protection
E89628
The many setting possibilities of the LTD protection slope allow the generator
thermal overload curve to be followed closely. The low setting of the STD
protection is compatible with the short-circuit behaviour of the generator.
Optimised protection of the generator thanks to the Micrologic releases of the NT,
NW and Compact NS ranges guarantees optimum continuity of supply.
E88696E
Figure 23: Masterpact NW/NT and Compact NS overload curves.
Generator overload
conditions
Circuit-breaker VIT
protection curve
Generator
short-circuit
conditions
Figure 24: IDMTL curves and generator overload curve.
.
30
4.2. Micrologic P & H for generator
monitoring
The Micrologic P and H incorporate other current, voltage, power and frequency
protection and/or monitoring functions suited to loads such as motors, generators
and transformers.
4.2.1. Implementation
E88008E
In the control unit “setting” menu, the operator selectors the functions that he
wishes to activate and accesses the various thresholds to be configured.
All the settings are made via the keys available on the front face or by remote
transmission.
For all functions, except for phase rotation direction, four thresholds must be set:
b activation threshold (1)
b activation time delay (2)
b de-activation threshold (3)
b de-activation time delay (4).
Activation
threshold
De-activation
threshold
Activation
time delay
De-activation
time delay
Relay
output
Figure 25.
When the function is activated, according to operator configuration, it can result
either in tripping or in an alarm, or in both.
31
The Schneider
protection solution
4.2.2. The monitoring functions
4.2.1.1. Current unbalance
E88009E
b application:
the acceptable values for current negative phase sequence components are
approximately:
v 15 % for generators
v 20 % for motors
As current unbalance effects are thermal and thus slow, the tripping threshold for
this protection must be configured according to the thermal time constant of the
equipment (a few minutes).
It can be used as an alarm to allow better distribution of single-phase loads.
I mean
Figure 26.
b principle:
the function compares a current unbalance to the threshold previously set by the
user. The current unbalance Dl is the value as a % of the difference, E max,
between maximum current and mean current, lmean.
Imean = (I1+I2+I3)/3.
Emax = max (Ii) - Imean.
∆I = Emax/Imean.
The activation and de-activation thresholds, configured by the user, are a % of
Imean:
∆l = 5 % represents a relatively small unbalance (l1 = 4000 A, l2 = 3800 A, l3 =
3600 A).
∆l = 90 % represents a strongly unbalanced power supply (l1 = 4000 A, l2 = 1200
A, l3 = 1120 A).
Example 1: I1 = 4000 A, I2 = 2000 A, I3 = 3300 A.
Imean = 3100 A.
Emax = I2 - Imoy.
∆I = Emax/Imean, ∆I = 35 %.
Nota : calculation of current (or voltage) unbalance in HV distribution is normally
used: Iunbal(%) = 100 x (Iinverse)/(Idirect)
Micrologic calculates current unbalance as per the formula:
Iunbal(%) = 100 x (lmax)/(lmean)
Both calculation modes yield similar results.
b current unbalance setting:
activation
threshold
activation
time delay
de-activation
threshold
de-activation
time delay
32
setting range
setting step
accuracy
5 à 60 % of Imean
1%
-10 % to 0 %
1 to 40 s
1s
-20 % to 0 %
-5 % to 0 % of
activation threshold
10 to 360 s
1%
-10 % to 0 %
1s
-20 % to 0 %
4.2.2.2. Overcurrent
E88010E
b application:
overcurrent protection is suitable for:
v monitoring cyclic loads (prevent temperature rise of loads, etc.)
v managing consumption (guard against overshoots).
I consumed
I sizing
Activation
1h
Ta = activation time delay
Td = de-activation time delay
Figure 27: Consumption monitoring.
This is used to calculate the mean value of consumed current. It can deliver a
load shedding order to remain within the limits:
v of the supplier’s contract - Main source v or of delivered power - Replacement source.
It provides thermal type protection for each phase and for the neutral (dry
transformers).
b principle:
this function calculates the mean value of each current of the three phases and
the neutral over a time programmable between 5 minutes and one hour and over
a sliding window refreshed every 15 seconds.
b overcurrent setting
activation
threshold
activation
time delay
de-activation
threshold
de-activation
time delay
setting range
setting step
accuracy
0.2 to 10 In
1A
± 6.6 %
1500 s
15 s
-20 % to 0 %
0.2 to 10 In of
activation threshold
10 to 3000 s
1A
± 6.6 %
15 s
-20 % to 0 %
4.2.2.3. Voltage unbalance
b application:
detection of voltage unbalance or loss.
Voltage unbalance protection is more suitable to the installation as a whole,
whereas current unbalance protection is more suitable for loads.
This is because voltage unbalance will affect all the feeders of this installation,
while current unbalance may vary according to its position in the installation.
b principle:
the function compares voltage unbalance to the threshold set beforehand by the
user.
Voltage unbalance DU is the value as a % of the difference, E max, between
maximum voltage and the mean value of the phase-to-phase voltages, Umean.
Umean = (U12 + U23 + U31)/3.
Emax = max(Ui) - Umean.
DU= Emax/Umean.
33
The Schneider
protection solution
The activation and de-activation thresholds, configured by the user, are a % of U
max:
∆U = 5 % represents a relatively small unbalance
∆U = 90 % represents a strongly unbalanced power supply
Example
Case similar to a phase loss associated with unbalance on the other phases.
U12 = 330 V, U23 = 390 V, U31 = 10 V.
Umean = 243,3 V.
Emax = U31 - Umean.
∆U = Emax/Umean, ∆U = 96 %.
b voltage unbalance setting:
activation
threshold
activation
time delay
de-activation
threshold
de-activation
time delay
setting range
setting step
accuracy
2 à 30 % of Umean
1%
-10 % to 0 %
1 to 40 s
1s
-20 % to 0 %
2 % of activation
threshold
10 to 360 s
1%
-10 % to 0 %
1s
-20 % to 0 %
4.2.2.4. Overvoltage and undervoltage
b application:
the overvoltage and undervoltage protections can be used to:
v check output voltage of a generator
v prevent transformer saturation (overvoltage)
v switch from the Main to the Replacement source
v prevent temperature rise on motor starting (undervoltage)
Note: in actual fact, voltage drops and rises seriously affect the performance of
the loads supplied (see motor characteristics table below).
Motor characteristics
Torque curve
Slipping
Nominal current
Nominal efficiency
Nominal power factor
Starting current
Nominal temp. rise
Off-load P (Watt)
Voltage variation as a %
Un -10 %
Un -5 %
0,81
0,90
1,23
1,11
1,10
1,05
0,97
0,98
1,03
1,02
0,90
0,95
1,18
1,05
0,85
0,92
Un
1
1
1
1
1
1
1
1
Un +5 %
1,10
0,91
0,98
1,00
0,97
1,05
1
1,12
Un+10%
1,21
0,83
0,98
0,98
0,94
1,10
1,10
1,25
E88011E
b principle:
the function is activated when one of the three phase-to-phase voltages (U12,
U23, U31) is below (or above) the threshold set by the user for a time longer than
the time delay. It is de-activated when the 3 phase-to-phase voltages move back
above (or below) the de-activation threshold for a time longer than the time delay.
U max.
U min.
U12
Figure 28.
34
U23
U31
b undervoltage setting:
activation
threshold
activation
time delay
de-activation
threshold
de-activation
time delay
setting range
setting step
accuracy
100 à 690 V
5V
0 % to 5 %
0.2 to 5 s
0.1 s
0 % to 20 %
690 V of activation
threshold
0.2 to 36 s
5V
0 % to 5 %
0.1 s
0 % to 20 %
setting range
setting step
accuracy
100 à 1200 V
5V
-5 % to 0 %
0.2 to 5 s
0.1 s
0 % to 20 %
100 V of activation
threshold
0.2 to 36 s
5V
-5 % to 0 %
0.1 s
0 % to 20 %
b overvoltage setting:
activation
threshold
activation
time delay
de-activation
threshold
de-activation
time delay
4.2.2.5 Reverse active power
b application
reverse power protection is used to protect generators connected with the mains
(as an auxiliary or standby source) and generators operating in parallel
autonomously (e.g. marine).
Note
For protection of generators driven by diesel sets, the threshold must be set
between 5 and 20 % of generator active power for a period of 2 seconds.
For protection of generators driven by steam turbines, the threshold must be set
between 1 and 5 % of active power for a period of 2 seconds
E88012E
b principle:
the function is activated when the active power flowing in the opposite flow
direction to the energy defined by the user, is greater than the activation
threshold for a time longer than the time delay.
De-activation
zone
Activation zone
De-activation time delay
Activation time delay
Activation
threshold
De-activation
threshold
Reverse power
Figure 29.
35
The Schneider
protection solution
b reverse power setting:
activation
threshold
activation
time delay
de-activation
threshold
de-activation
time delay
setting range
setting step
accuracy
5 kW to 500 kW
5 kW
± 2.5 %
0.2 to 20 s
0.1 s
-20 % to 0 %
5 kW of activation
threshold
1 to 360 s
5 kW
± 2.5 %
0.1 s
-20 % to 0 %
4.2.2.6. Over frequency and under frequency
b causes
incorrect operation of generator / motor set
frequency reduction is possible when a generator is on overload
frequency increase is possible should the generator begin racing after losing its
load.
b application:
over frequency and under frequency protection is used to:
Check generator frequency
Check frequency at motor terminals
Prevent saturation of transformers further to a frequency reduction.
b principle:
the function is activated when frequency exceeds the programmed threshold for
a time longer than the time delay.
E88013E
Over frequency monitoring
Over F
de-activation
zone
Over F
activation
zone
De-activation
time delay
Activation
time delay
Frequency
De-activation
threshold
Activation
threshold
E88007E
Figure 30: Operation for overfrequency.
De-activation
time delay
Under F
activation
zone
Under F
de-activation
zone
Activation
time delay
Frequency
Activation
threshold
Figure 31: Operation for underfrequency.
36
De-activation
threshold
b overfrequency setting:
activation
threshold
activation
time delay
de-activation
threshold
de-activation
time delay
setting range
setting step
accuracy
45 to 540 Hz
0.5 Hz
± 0.5 Hz
0.2 to 5 s
0.1 s
-20 % to 0 %
540 Hz of
activation threshold
1 to 36 s
0.5 Hz
± 0.5 Hz
0.1 s
-20 % to 0 %
setting range
setting step
accuracy
45 to 540 Hz
0.5 Hz
± 0.5 Hz
0.2 to 5 s
0.1 s
-20 % to 0 %
45 Hz of
activation threshold
1 to 36 s
0.5 Hz
± 0.5 Hz
0.1 s
-20 % to 0 %
b underfrequency setting:
activation
threshold
activation
time delay
de-activation
threshold
de-activation
time delay
4.2.2.7 Phase rotation direction
b application:
phase reversal protection is used to:
v check the rotation direction of three-phase motors (e.g. boats berthed)
v prevent connection of generators to the electrical network if rotation direction is
reversed
b principle:
the function compares the phase succession order.
In event of reversal, protection is activated after 300 ms (tripping or alarm).
b phase rotation direction setting:
setting range
DF
time delay
Φ1, Φ2, Φ3 or Φ1, Φ3, Φ2
300 ms
37
The Schneider
protection solution
4.3. Micrologic for insulation fault
protection
Currents due to insulation faults can be dangerous for people (risk of indirect
contact) and equipment (fire risk).
To provide protection and satisfy all installation systems as completely as
possible, the Micrologic range incorporates as standard:
b on 6.0 units, ground protection
b on 7.0 units, residual current protection.
4.3.1. Ground protection
b fire protection:
this is stipulated by the NEC (National Electric Code) in the USA to avoid risk of
fire that could occur in event of an impedance-grounded (arc) fault, not detected
by the standard L, S, I protection devices (fault smaller than the STD threshold or
intermittent fault).
b protection of people:
this is also used on TN-S networks with very long cables to guarantee
instantaneous tripping in event of an insulation fault. Ground protection is
performed according to two systems.
4.3.1.1. Residual sensor
E88017E
The “residual” type protection determines earth fault current by the vector sum of
phase and neutral currents.
This protection detects faults downstream of the circuit-breaker.
A CT is placed on each of the phases and the neutral (if distributed).
For the Masterpacts, the CTs are built into the circuit-breakers.
Circuit-breaker
with built-in
MX protection
Figure 32.
The Neutral CT provides both ground/residual protection and overload protection
of the neutral conductor.
38
4.3.1.2. Source Ground Return (SGR)
E88018
The “Source Ground Return” system directly measures the earth fault current by
a specific external sensor.
This protection detects faults upstream and downstream of the circuit-breaker.
It is only possible at the supply end of the LV installation.
Figure 33.
Note: the SGR CT is specific to this application.
The Ground protection and Neutral protection are separate and thus can be
combined.
Setting the protection devices
Ground protection can be set for its threshold (limited to 1200 A) by 9 bands and
by its time delay (same as the Short Time Delay).
To enhance discrimination with fuses or other circuit-breakers, part of the ground
protection curve can be converted into a reverse curve by choosing the l2tON
setting.
The SGR protection requires use of the MDGF module.
4.3.2. Residual current device (RCD) protection or
“zero sequence” system
E88019
RCD protection is stipulated by installation standards (IEC 60 364) for protection
of people and equipment in the following cases:
b TT type grounding systems, in which currents resulting from insulation faults
are small
b TN-S type networks with very long cables, in which the instantaneous threshold
is not sufficient to protect a short-circuit at the end of the line
b IT networks with very long cables.
This protection is also used to provide additional fire protection.
Its threshold from 500 mA to 30 A and time delay can be set to ensure residual
current discrimination.
Figure 34.
An external rectangular toroid sensor is compulsory.
39
Summary
5.1. Diagram
E88014E
A typical example of a high power electrical installation for an office building (see
Note 1).
Source
IT safety
source
TN-S replacement
source
GS
Main LV board
GS
Non-priority
feeders,
heating, etc.
Non-sensitive
priority feeders,
lighting, elevator, etc.
Safety
feeders
300 kVA
Sensitive
feeders,
computer, etc.
Source
Chassis
COM
module
IT safety
source
Main LV board
GS
Non-priority
feeders
40
TN-S
replacement
source
GS
Chassis
COM
module
Communication
bus
Proprietary
bus
5.2. Comments
Monitoring
The Long and Short Time Delay protection settings
are of the Distribution type. Discrimination with
downstream feeders is of the time type and total.
The monitoring functions mainly concern
verification of inrush power: this allows use, if
necessary, of load shedding to cope with load
peaks.
Replacement source
The set is optimised with exact dimensioning.
Setting of the LTD protection will follow the Set’s
protection curve and setting of the STD protection
will be low (from 1.5 to 2.5 lg).
The Set supplies priority feeders. As our
example is an office building, these feeders are
often not linear. Due to the power ratio and high
subtransient impedances between the Set and
the Main source (transformer), voltage total
harmonic distortion (THDu) is often very high
and greater than load withstand value (even for
non-sensitive loads).
1. Installation of a Micrologic H ensures
permanent monitoring, if necessary, of the
relevant harmonic pollution parameters.
E88697
E88698
Source to protect
E88104
Protection
Main source
Discrimination with downstream priority feeders
must allow for the low settings (in particular for the
STD).
l measurement and H spectrum vignettes
For feeders supplied by the UPS, discrimination
must be ensured with the downstream feeders (this
2. Use of a UPS incorporating a harmonicis because the UPS switches to mains 2 to perform
suppression filter is the ideal solution for using a
the discrimination function).
Generator Set/UPS combination with optimised
sizing and to bring upstream total harmonic
distortion down to a completely acceptable value.
Safety source
The Set must operate in all circumstances.
The settings made will eliminate nuisance tripping.
Discrimination must allow for these settings and
choose a downstream circuit distribution that will
enable this.
E88103E
Source
Fine network analysis in real time is not required.
However, alarm transfer and storage are
recommended. If necessary, network
parameters (voltage, current, etc.) can be
measured for analysis after the fault.
Safety and
replacement source
GS
Note 1: in the diagram on the previous page, the
Safety Set and the Replacement Set are separate:
this is advantageous only if the priority and safety
feeders are physically separate. As explained in
paragraph 1.3, the 2 functions are normally grouped.
The following diagram gives an example of this:
Non-priority
feeders
Safety
Priority
feeders
Figure 35.
41
Summary
5.3.
functions
production set
Summary
replacement
set
safety set
parallelcomments
connected sets*
generator overload protection
overloads
b
b
v
b v (1)
(1) for Production GS allow for:
- one hour overload
- one hour overload every 12 hours
Note: disabling of thermal memory may be requested
short-circuits
b
b
v
b v
Magnetic setting at 1.5 ln
insulation fault protection
fire ground protection
b
b
v
b v
Use in case of TN-S grounding system
ground fault protection
restricted differential
v
v
v
v
For uncoupling and placing the GS out of operation if fault
protection of people
b
b
b
b
Protection, if necessary, of the RCD type (Zero Sequence)
current unbalance
v
v
v (2)
v
(2) Safety GS: the Generator Set must operate whatever
current unbalance
Production and/or Replacement GS: same problem as with
supply by transformers
overcurrent
v (3)
v (3)
v
v (3)
(3) to be used to perform load shedding
voltage unbalance
v
v
v
v
overvoltage and
undervoltage
b (4)
b (4)
v
b v (4)
network monitoring
(4) use Protection only if risk of breaking equipment /or loss
of safety is greater in the event of overvoltage /
undervoltage than in the event of breaking
frequency
b (4)
b (4)
v
b v (4)
reverse active power
ns
ns
ns
v
If the GS operates as a motor, there is a risk of:
- deterioration of the diesel set
- placing all sources out of operation (by overload)
harmonic measurement
v
v
v
In particular, if non-linear loads are great during operation
on GS (>50 %)
For example Replacement GS with high power UPS
(computer centre)
b
v
ns
* In
42
Important or compulsory
Recommended
Not significant
case of two choices, choose that for the parallel-connected generator set category.
Additional technical
informations
44
6.2. Control units characteristics
STR and Micrologic A, H and P
52
6.3. Communication characteristics
for Compact NS and Masterpact
71
E89629
Applications
6.1. Characteristics tables of circuit breakers
Compact NS and Masterpact
43
6.1. Characteristics tables
of circuit breakers
Compact NS up to 630 A
045345si
Compact circuit breakers
number of poles
control
manual
connections
electric
fixed
toggle
direct or extended rotary handle
front connection
rear connection
front connection
rear connection
front connection
rear connection
plug-in (on base)
withdrawable (on chassis)
048286si
Compact NS250H.
electrical characteristics as per IEC 60947-2 and EN 60947-2
rated current (A)
In
40 °C
65 °C
rated insulation voltage (V)
Ui
rated impulse withstand voltage kV)
Uimp
rated operational voltage (V)
Ue
AC 50/60 Hz
DC
type of circuit breaker
ultimate breaking capacity (kA rms)
lcu
AC 50/60 Hz 220/240 V
380/415 V
440 V
500 V
525 V
660/690 V
DC
250 V (1P)
500 V (2P in series)
service breaking capacity
lcs
% Icu
suitability for isolation
utilisation category
durability (C-O cycles)
mechanical
electrical
440 V
In/2
In
electrical characteristics as per NEMA AB1
breaking capacity (kA)
240 V
480 V
600 V
electrical characteristics as per UL508
breaking capacity (kA)
Compact NS630L.
protection
trip units
overload protection
short-circuit protection
earth-fault protection
zone selective interlocking
add-on earth-leakage protection
240 V
480 V
600 V
long time
Ir (In x …)
short time
lsd (Ir x …)
instantaneous Ii (In x …)
lg (In x …)
ZSI
add-on Vigi module
combination with Vigirex relay
current measurements
additional measurement, indication and control auxiliaries
indication contacts
MX shunt and MN undervoltage releases
voltage-presence indicator
current-transformer module and ammeter module
insulation-monitoring module
remote communication by bus
device-status indication
device remote operation
transmission of settings
indication and identification of protection devices and alarms
transmission of measured current values
installation
accessories
(1) 2P in 3P case for type N only
(2) specific trip units are available for operational
voltages > 525 V
(3) operational voltage y 500 V.
44
dimensions (mm) W x H x D
weight (kg)
terminal extensions and spreaders
terminal shields and interphase barriers
escutcheons
fixed, front connections
2-3P / 4P
fixed, front connections
3P / 4P
source changeover system (see section on source changeover systems)
manual, remote-operated and automatic source changeover systems
NS125E
NS100
NS160
NS250
NS400
NS630
3, 4
b
b
b
-
2(1), 3, 4
b
b
b
b
b
b
b
b
b
2(1), 3, 4
b
b
b
b
b
b
b
b
b
2(1), 3, 4
b
b
b
b
b
b
b
b
b
3, 4
b
b
b
b
b
b
b
b
b
3, 4
b
b
b
b
b
b
b
b
b
125
750
8
500
E
25
16/10
10
6
-
L
150
150
130
100
100
75
100
100
160
150
750
8
690
500
N
H
85
100
36
70
35
65
30
50
22
35
8
10
50
85
50
85
100%
b
A
40 000
40 000
20 000
L
150
150
130
70
50
20
100
100
250
220
750
8
690
500
N
H
85
100
36
70
35
65
30
50
22
35
8
10
50
85
50
85
100%
b
A
20 000
20 000
10 000
L
150
150
130
70
50
20
100
100
400
320
750
8
690
500
N
H
85
100
45
70
42
65
30
50
22
35
10(2) 20(2)
85
85
100%
b
A
15 000
12 000
6 000
L
150
150
130
100
100
75(2)
-
630
500
750
8
690
500
N
H
85
100
45
70
42
65
30
50
22
35
10(2) 20(2)
85
85
100%(3)
b
A
15 000
8 000
4 000
L
150
150
130
70
50
35(2)
-
50%
b
A
10 000
6 000
6 000
100
100
750
8
690
500
N
H
85
100
25
70
25
65
18
50
18
35
8
10
50
85
50
85
100%
b
A
50 000
50 000
30 000
E
5
5
-
N
85
25
10
H
100
65
35
L
200
130
50
N
85
35
20
H
100
65
35
L
200
130
50
N
85
35
20
H
100
65
35
L
200
130
50
N
85
42
20
H
100
65
35
L
200
130
50
N
85
42
20
H
100
65
35
L
200
130
50
E
-
N
85
25
10
H
85
65
10
L
-
N
85
35
10
H
85
65
10
L
-
N
85
35
18
H
85
65
18
L
-
N
85
42
18
H
85
65
18
L
-
N
85
42
30
H
85
65
30
L
-
non interchangeable
12.5… 125 (A)
b
b
-
TM (thermal-magnetic)
b
b
b
b
-
b
b
-
b
b
b
b
b
-
b
b
-
b
b
b
105 x 161 x 86
1.7 / 2.3
b
b
b
105 x 161 x 86 / 140 x 161 x 86
1.6 to 1.9 / 2.1 to 2.3
b
b
b
140 x 255 x 110 / 185 x 255 x 110
6.0 / 7.8
-
b
b
STR22 (electronic)
b
b
b
b
b
-
STR23 (electronic)
b
b
b
b
b
-
STR53 (electronic)
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
-
b
b
-
b
b
b
b
b
45
6.1. Characteristics tables
of circuit breakers
Compact NS
from 630 up to 3200 A
Compact circuit breakers
045151si
number of poles
control
manual
toggle
direct or extended rotary handle
electric
type of circuit breaker
connections
fixed
withdrawable (on chassis)
045178si
Compact NS800H.
Compact NS2000H.
front connection
rear connection
front connection
rear connection
electrical characteristics as per IEC 60947-2 and EN 60947-2
rated current (A)
In
50 °C
65 °C (1)
rated insulation voltage (V)
Ui
rated impulse withstand voltage (kV)
Uimp
rated operational voltage (V)
Ue
AC 50/60 Hz
DC
type of circuit breaker
ultimate breaking capacity (kA rms)
lcu
AC 50/60 Hz 220/240 V
380/415 V
440 V
500/525 V
660/690 V
DC
250 V
500 V
service breaking capacity (kA rms)
lcs
Value or % Icu
short-time withstand current (kA rms)
lcw
0.5 s
V AC 50/60 Hz
1s
suitability for isolation
utilisation category
durability (C-O cycles)
mechanical
electrical
440 V
In/2
In
690 V
In/2
In
pollution degree
electrical characteristics as per Nema AB1
breaking capacity at 60 Hz (kA)
protection and measurements
interchangeable control units
overload protection
short-circuit protection
earth-fault protection
residual earth-leakage protection
zone selective interlocking
protection of the fourth pole
current measurements
additional indication and control auxiliaries
indication contacts
voltage releases
240 V
480 V
600 V
long time
Ir (In x …)
short time
Isd (Ir x …)
instantaneous Ii (In x …)
lg (In x …)
∆n
I∆
ZSI
MX shunt release
MN undervoltage release
remote communication by bus
device-status indication
device remote operation
transmission of settings
indication and identification of protection devices and alarms
transmission of measured current values
installation
accessories
terminal extensions and spreaders
terminal shields and interphase barriers
escutcheons
dimensions fixed devices, front connections (mm)
3P
HxWxD
4P
weight fixed devices, front connections (kg)
3P
4P
(1) 65°C with vertical connections. See the temperature
derating tables for other types of connections.
46
source changeover system (see section on source changeover systems)
manual, remote-operated and automatic source changeover systems
NS630b NS800
3, 4
b
b
b
N
b
b
b
b
H
b
b
b
b
NS1250
3, 4
b
b
b
N
b
b
b
b
L
b
b
b
b
630
630
750
8
690
500
N
H
50
70
50
70
50
65
40
50
30
42
75% 50%
25
25
17
17
b
B
B
10000
6000
5000
4000
2000
III
800
800
N
50
35
25
L
125
100
-
H
65
50
50
NS1000
1000
1000
1250
1250
750
8
690
500
N
50
50
50
40
30
75%
25
17
b
B
10000
5000
4000
3000
2000
III
L
150
150
130
100
25
100%
10
7
A
Micrologic 2.0
b
b
b
-
N
50
35
25
Micrologic 5.0
b
b
b
b
-
NS1600
H
b
b
b
b
1600
1510
H
70
70
65
50
42
50%
25
17
B
5000
2000
2000
1000
H
65
50
50
Micrologic 2.0 A
b
b
b
b
b
b
b
b
327 x 210 x 147
327 x 280 x 147
14
18
1600
1550
750
8
690
500
N
85
70
65
65
65
65 kA
40
28
b
B
5000
3000
2000
2000
1000
III
NS2500
NS3200
2500
2500
3200
2970
H
b
2000
1900
H
125
85
85
75%
40
28
B
-
N
85
65
50
Micrologic 5.0 A
b
b
b
b
b
b
Micrologic 6.0 A
b
b
b
b
b
b
b
b
b
b
b
b
-
NS1600b NS2000
3, 4
b
N
b
-
H
125
85
-
Micrologic 7.0 A
b
b
b
b
b
b
b
b
b
b
b
b
-
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
350 x 420 x 160
350 x 535 x 160
24
36
b
47
056408si
6.1. Characteristics tables
of circuit breakers
Masterpact NT06 to NT16
common characteristics
number of poles
rated insulation voltage (V)
impulse withstand voltage (kV)
rated operational voltage (V AC 50/60 Hz)
suitability for isolation
degree of pollution
Ui
Uimp
Ue
IEC 60947-2
IEC 60664-1
3/4
1000/1250
12
690
3
circuit-breaker characteristics as per IEC 60947-2
rated current (A)
rating of 4th pole (A)
sensor ratings (A)
type of circuit breaker
ultimate breaking capacity (kA rms)
V AC 50/60 Hz
rated service breaking capacity (kA rms)
rated short-time withstand current (kA rms)
V AC 50/60 Hz
integrated instantaneous protection (kA peak ±10%)
rated making capacity (kA peak)
V AC 50/60 H
In
at 40 °C / 50 °C**
Icu
220/415 V
440 V
525 V
690 V
% Icu
0.5 s
3s
Ics
Icw
Icm
220/415 V
440 V
525 V
690 V
break time (ms)
closing time (ms)
circuit-breaker characteristics as per NEMA AB1
breaking capacity (kA)
V AC 50/60 Hz
240 V
480 V
600 V
switch-disconnector characteristics as per IEC 60947-3
type of switch-disconnector
rated making capacity (kA peak)
V AC 50/60 Hz
Icm
rated short-time withstand current (kA rms)
V AC 50/60 Hz
ultimate breaking capacity (Icu) with external protection relay,
maximum delay 350 ms
Icw
220/415 V
440 V
500/690 V
0.5 s
3s
installation, connection and maintenance
service life
C/O cycles x 1000
mechanical
electrical
with maintenance
without maintenance
without maintenance
motor control (AC3-947-4)
connection
drawout
fixed
dimensions (mm)
HxWxD
drawout
fixed
weight (kg)
drawout
(approximate)
fixed
* see the current-limiting curve in the "additional characteristics" section
** 50 °C: rear vertical connected. Refer to temperature derating tables
for other connection types.
(1) SELLIM system.
48
440 V
690 V
690 V
FC
RC
FC
RC
3P
4P
3P
4P
3P/4P
3P/4P
NT06
NT08
NT10
NT12
NT16
630
630
400
to 630
800
800
400
to 800
1000
1000
400
to 1000
1250
1250
630
to 1250
1600
1600
800
to 1600
H1
42
42
42
42
100 %
42
20
88
88
88
88
25
< 50
42
42
42
L1*
150
130
100
25
H1
42
42
42
42
100 %
42
20
88
88
88
88
25
< 50
10
1(1)
330
286
220
52
9
150
100
25
42
42
42
HA
75
75
75
42
20
35
HA
75
75
75
42
20
35
25
25
12.5
12.5
6
3
3
2
3
2
b
b
b
b
b
b
b
b
322 x 288 x 280
322 x 358 x 280
301 x 274 x 211
301 x 344 x 211
30/39
14/18
25
12.5
6 (NT16: 3)
2 (NT16: 1)
2 (NT16: 1)
b
b
b
b
sensor selection
sensor rating (A)
Ir threshold setting (A)
400
160 to 400
630
250 to 630
800
320 to 800
1000
400 to 1000
1250
500 to 1250
1600
640 to 1600
49
6.1. Characteristics tables
of circuit breakers
Masterpact NW08 à NW63
056409si
common characteristics
number of poles
rated insulation voltage (V)
impulse withstand voltage (kV)
rated operational voltage (V AC 50/60 Hz)
suitability for isolation
degree of pollution
Ui
Uimp
Ue
IEC 60947-2
IEC 60664-1
3/4
1000/1250
12
690/1150
4
circuit-breaker characteristics as per IEC 60947-2
056410si
rated current (A)
rating of 4th pole (A)
sensor ratings (A)
type of circuit breaker
ultimate breaking capacity (kA rms)
V AC 50/60 Hz
rated service breaking capacity (kA rms)
rated short-time withstand current (kA rms)
V AC 50/60 Hz
integrated instantaneous protection (kA peak ± 10%)
rated making capacity (kA peak)
V AC 50/60 Hz
In
at 40 °C / 50 °C**
Icu
220/415 V
440 V
525 V
690 V
1150 V
% Icu
1s
3s
Ics
Icw
Icm
220/415 V
440 V
525 V
690 V
1150 V
break time (ms)
closing time (ms)
circuit-breaker characteristics as per NEMA AB1
breaking capacity (kA)
V AC 50/60 Hz
240 V
480 V
600 V
switch-disconnector characteristics as per IEC 60947-3
type of switch-disconnector
rated making capacity (kA peak)
V AC 50/60 Hz
Icm
rated short-time withstand current (kA rms)
V AC 50/60 Hz
ultimate breaking capacity (Icu) with external protection relay,
maximum delay 350 ms
Icw
220/415 V
440 V
500/690 V
1150 V
1s
3s
installation, connection and maintenance
service life
C/O cycles x 1000
mechanical
electrical
with maintenance
without maintenance
without maintenance
motor control (AC3-947-4)
connection
drawout
fixed
dimensions (mm)
HxWxD
drawout
fixed
weight (kg)
drawout
(approximate)
fixed
* see the current-limiting curve in the "additional characteristics" section
** 50°C: rear vertical connected. Refer to temperature derating tables
for other connection types.
(1) except 4000 A.
50
440 V
690 V
1150 V
690 V
FC
RC
FC
RC
3P
4P
3P
4P
3P/4P
3P/4P
NW08 NW10 NW12 NW16 NW20
NW25 NW32 NW40
NW40b NW50 NW63
800
800
400
to 800
2500
2500
1250
to 2500
4000
4000
2000
to 4000
4000
4000
2000
to 4000
H1
100
100
100
100
100 %
100
100
without
220
220
220
220
25
< 80
H2
150
150
130
100
-
150
150
100
N1
42
42
42
42
100 %
42
22
without
88
88
88
88
25
< 70
1000
1000
400
to 1000
1250
1250
630
to 1250
1600
1600
800
to 1600
H1
65
65
65
65
-
H2
100
100
85
85
-
L1*
150
150
130
100
-
H10
50
65
36
without
143
143
143
143
25
85
50
190
220
220
187
187
25
30
30
80
330
330
286
220
10
50
50
without
105
25
42
42
42
65
65
65
100
100
85
150
150
100
NA
88
88
88
42
42
HA
105
105
105
50
36
50
HF
187
187
187
85
50
85
25
12.5
10
10
10
10
10
10
10
10
10
b
b
b
b
b
b
b
b
b
b
b
b
439 x 441 x 395
439 x 556 x 395
352 x 422x 297
352 x 537x 297
90/120
60/80
3
3
b
b
-
2000
2000
1000
to 2000
H1
65
65
65
65
100 %
65
36
without
143
143
143
143
25
< 70
H2
100
100
85
85
-
H3
150
150
130
100
-
L1*
150
150
130
100
-
H10
50
85
75
190
220
220
187
187
25
65
65
150
330
330
286
220
25
30
30
80
330
330
286
220
10
50
50
without
105
25
-
65
65
65
100
100
85
150
150
100
150
150
100
HA10
105
50
50
50
HA
105
105
105
50
36
50
HF
187
187
187
85
75
85
0.5
b
b
-
20
10
8
6
6
b
b
b
b
8
6
6
b
b
b
b
2
2
6
b
b
-
3
3
b
b
-
3200
3200
1600
to 3200
H1
65
65
65
65
100 %
65
65
without
143
143
143
143
25
< 70
H2
100
100
85
85
-
H3
150
150
130
100
-
H10
50
85
75
190
220
220
187
187
25
65
65
150
330
330
286
220
25
50
50
without
105
25
65
65
65
100
100
85
150
150
100
-
100
100
100
HA10
105
50
50
50
HA
121
121
121
55
55
55
HF
187
187
187
85
75
85
HA10
105
50
50
50
HA
187
187
187
85
85
85
0.5
b
b
-
20
10
5
2.5
2.5
b
b
b (1)
b
-
5
2.5
2.5
b
b
b (1)
b
1.25
1.25
2.5
b
b
-
5000
5000
2500
to 5000
6300
6300
3200
to 6300
100
100
270
330
330
286
220
25
10
5
1.5
1.5
1.5
1.5
b
b
b
b
479 x 786 x 395
479 x 1016 x 395
352 x 767x 297
352 x 997x 297
225/300
120/160
0.5
b
b
-
sensor selection
sensor rating (A)
Ir threshold
setting (A)
400
160
to 400
630
250
to 630
800
320
to 800
1000
400
to 1000
1250
500
to 1250
1600
630
to 1600
2000
800
to 2000
2500
1000
to 2500
3200
1250
to 3200
4000
1600
to 4000
5000
2000
to 5000
6300
2500
to 6300
51
Compact NS400 to 630 circuit
breakers, types N, H and L, 3-pole
and 4-pole, may be equipped with
any of the STR23SE, STR23SV,
STR53UE and STR53SV electronic
trip units.
The STR53UE and STR53SV trip
units offer a wider range of settings
and the STR53UE offers a number
of optional protection, measurement
and communications functions.
For DC applications, the Compact
NS400H and 630H circuit breakers
are equipped with a built-in MP
magnetic trip unit.
52
Compact NS400 to 630
60
E88733E
In short
6.2. Control units
characteristics
250
400
500
630
STR23SE / STR53UE
STR23SE / STR53UE
STR23SV / STR53SV
MP
Standard protection
with selectivity
Protection of systems supplied by
generators. Protection of long cables
Protection of DC
distribution systems
Protection of systems U > 525 V
Selection of the trip unit depends on the type of distribution system protected and
the operational voltage of the circuit breaker.
Protection for all types of circuits, from 60 to 630 A, is possible with only four tripunit catalogue numbers, whatever the circuit-breaker operational voltage:
b U y 525 V: STR23SE or STR53UE
b U > 525 V: STR23SV or STR53SV.
Trip units do not have a predefined rating. The tripping threshold depends on the
circuit breaker rating and the LT (long time) current setting.
For example, for an STR23SE trip unit set to the maximum value, the tripping
threshold is:
v 250 A, when installed on a Compact NS400 250 A
v 630 A, when installed on a Compact NS630.
STR23SE (U y 525 V) and STR23SV (U > 525 V)
electronic trip units
E88734
6
1
7
STR 23 SE
Io
1
.5
x In
+
90
105 %Ir
alarm
Ir
.8 .9
.7
.63
.88
.85
.8
.9 .93
.95
.98
1
3
4
3
2
5
x Io
-
Isd
6
x Ir
7
8
10
Ir
Isd
E88735
test
t
1
2
3
4
0
1
2
3
4
5
6
7
Ir Im
5
I
long-time threshold (overload protection)
long-time tripping delay
short-time pick-up (short-circuit protection)
short-time tripping delay
instantaneous pick-up (short-circuit protection)
test connector
percent load indication.
Protection
The protection functions may be set using the adjustment dials.
Overload protection
Long-time protection with an adjustable threshold and fixed tripping delay:
b Io base setting (6-position dial from 0.5 to 1)
b Ir fine adjustment (8-position dial from 0.8 to 1).
Short-circuit protection
Short-time and instantaneous protection:
b short-time protection with an adjustable pick-up and fixed tripping delay
b instantaneous protection with fixed pick-up.
Protection of the fourth pole
On four-pole circuit breakers, neutral protection is set using a three-position
switch to 4P 3d (neutral unprotected), 4P 3d + N/2 (neutral protection at 0.5 In) or
4P 4d (neutral protection at In).
Indications
A LED on the front indicates the percent load:
b ON - load is > 90 % of Ir setting
b flashing - load is > 105 % of Ir setting.
Test
A mini test kit or a portable test kit may be connected to the test connector on the
front to check circuit-breaker operation after installing the trip unit or accessories.
53
6.2. Control units
characteristics
Compact NS400 to 630
STR53UE (U y 525 V) and STR53SV (U > 525 V)
electronic trip units
E88737
8
1
2
3
4
STR 53 UE
Io
.7
.8 .9
.88
1
.6
.5
.9 .93
.95
.98
.85
.8
1
x In
+
3
4 5
2
tsd
(s).2
x Ir
.3 .3
0,5
16
0
on
(s) @ 6 Ir
3
6
I2t
4 6
2
8
10
1.5
>Isd
x In
>Ig
.2
0
test
.4
.5 .6
.7
fault
11
.2
x In
.4 .4
1
A
> Im
> Ih
.3
In
tr
tsd
I1
I2
I3
Ir Isd li
.2
.2
on
> Ir
.8
.3
.1
off
7 (*)
µP
Ig
g
8
10
9
(*)
tg
(s) .3
.1
.1
2
>Ir
6
Ii
1.5
8 16
4
-
1
x Io
tr
test
%Ir
Isd
Ir
5
.1
I2t
off
E88736
t
1
2
3
4
6
7
0
5
Ir
Isd
Ii
I
1 long-time threshold (overload protection)
2 long-time tripping delay
3 short-time pick-up (short-circuit protection)
4 short-time tripping delay
5 instantaneous pick-up (short-circuit protection)
6 optional earth-fault pick-up
7 optional earth-fault tripping delay
8 test connector
9 battery and lamp test pushbutton.
(*) STR avec l'option "défaut terre".
Earth-fault protection (T) (see the "Options for the STR53UE electronic
trip unit" section on the following pages).
With the earth-fault option (T) on the STR53UE electronic trip unit, an external
neutral sensor can be installed (situation for a three-pole circuit breaker in a
distribution system with a neutral). Available ratings of external neutral
sensors: 150, 250, 400, 630 A.
Protection
The protection functions may be set using the adjustment dials.
Overload protection
Long-time protection with adjustable threshold and tripping delay:
b Io base setting (6-position dial from 0.5 to 1)
b Ir fine adjustment (8-position dial from 0.8 to 1).
Short-circuit protection
Short-time and instantaneous protection:
b short-time protection with adjustable pick-up and tripping delay,
with or without constant I2t
b instantaneous protection with adjustable pick-up.
Protection of the fourth pole
On four-pole circuit breakers, neutral protection is set using a three-position
switch to 4P 3d (neutral unprotected), 4P 3d + N/2 (neutral protection at 0.5 In) or
4P 4d (neutral protection at In).
Overload LED (% Ir)
A LED on the front indicates the percent load:
b when ON, the load is > 90 % of Ir setting
b when flashing, the load is > 105 % of Ir setting.
54
Fault indications
A LED signals the type of fault:
b overload (long-time protection) or abnormal internal temperature (> Ir)
b short-circuit (short-time protection) or instantaneous (> Isd)
b earth fault (if earth-fault protection option installed) (> Ig)
b microprocessor malfunction:
v both (> Ig) and (> Isd) LEDs ON
v (> Ig) LED ON (if earth-fault protection option (T) installed).
Battery powered. Spare batteries are supplied in an adapter box. The LED
indicating the type of fault goes OFF after approximately ten minutes to conserve
battery power. The information is however stored in memory and the LED can be
turned back ON by pressing the battery/LED test pushbutton. The LED
automatically goes OFF and the memory is cleared when the circuit breaker is
reset.
Setting example
Test
E88738
What is the overload-protection threshold of a
Compact NS400 circuit breaker equipped with
an STR23SE (or STR23SV) trip unit set
to Io = 0.5 and Ir = 0.8 ?
Io
.7
.63
.8 .9
.5
Ir
1 .88
.85
.8
x In
.9 .93
.95
.98
1
A mini test kit or a portable test kit may be connected to the test connector on the
front to check circuit-breaker operation after installing the trip unit or accessories.
The test pushbutton tests the battery and the (% Ir), (> Ir), (> Isd) and (> Ig)
LEDs.
Self monitoring
The circuit breaker trips if a microprocessor fault or an abnormal temperature
is detected.
x Io
Options
Answer
In x Io x Ir = 400 x 0.5 x 0.8 = 160 A.
The identical trip unit, with identical settings but
installed on a Compact NS630 circuit breaker, will
have an overload-protection threshold of:
630 x 0.5 x 0.8 = 250 A.
trip units
ratings (A)
circuit breaker
In 20 to 70 ° C (1)
Compact NS400 N/H/L
Compact NS630 N/H/L
Four options are available:
b earth-fault protection T
b ammeter I
b zone selective interlocking ZSI
b communications option COM.
STR23SE (U y 525V)
STR23SV (U > 525V)
STR53UE (U y 525V)
STR53SV (U > 525V)
150
b
-
150
b
-
250
b
-
400
b
-
630
b
250
b
-
400
b
-
630
b
overload protection (Long time)
current setting
time delay (s)
(min.…max.)
Ir = In x …
0.4...1
adjustable, 48 settings
fixed
90...180
5...7.5
3.2...5.0
0.4...1
adjustable, 48 settings
adjustable
8...15
34...50
69...100
0.4...0.5 1.5...2
3...4
0.2...0.74 1...1.4
2...2.8
2...10
adjustable, 8 settings
fixed
y 40
y 60
1.5...10
adjustable, 8 settings
adjustable, 4 settings + "constant I2t" option
y 15
y 60
y 140
y 230
y 60
y 140
y 230
y 350
11
fixed
1.5...11
adjustable, 8 settings
4P 3d
4P 3d + N/2
4P 4d
no protection
0.5 x Ir
1 x Ir
no protection
0.5 x Ir
1 x Ir
ZSI
COM
I
T
-
b (standard)
b (2)
b (2)
b (2)
b (2)
at 1.5 x Ir
at 6 x Ir
at 7.2 Ir
138...200 277...400
6...8
12...16
4...5.5
8.2...11
short-circuit protection (Short time)
pick-up (A)
accuracy ± 15 %
time delay (ms)
Isd = Ir x …
max. resettable time
max. break time
short-circuit protection (instantaneous)
pick-up (A)
Ii = In x …
protection of the fourth pole
neutral unprotected
neutral protection at 0.5 In
neutral protection at In
options
indication of fault type
zone selective interlocking
communications
built-in ammeter
earth-fault protection
(1) If the trip units are used in high-temperature environments, the setting must take into account the thermal limitations of the circuit breaker. The overload
protection setting may not exceed 0.95 at 60° C or 0.9 at 70° C for the Compact NS400, and 0.95 at 50° C, 0.9 at 60° C or 0.85 at 70° C for the Compact NS630.
(2) This option is not available for the STR53SV trip unit.
55
In short
6.2. Control units
characteristics
Possible combinations:
bI
bT
b I +T
b I + COM
b I + T + COM
b ZSI
b ZSI + I
b ZSI + T
b ZSI + I + T
b ZSI +I + COM
b ZSI + I + T + COM
Compact NS400 to 630
Options for the STR53UE electronic trip unit
Earth-fault protection (T)
type
pick-up
accuracy ± 15%
time delay
"constant I2t" function
Residual
Ig = In x …
max. resettable time
max. break time
0.2 to 1
adjustable, 8 settings
adjustable, 4 settings
60
140
230
350
y 140 y 230 y 350 y 500
Ammeter (I)
A digital display continuously indicates the current of the phase with the greatest
load. The value of each current (I1, I2, I3, Ineutral) may be successively
displayed by pressing a scroll button.
LEDs indicate the phase for which the current is displayed.
Ammeter display limits:
b minimum current u 0.2 x In. Lower currents are not displayed
b maximum current y 10 x In.
Zone selective interlocking (ZSI)
A number of circuit breakers are interconnected one after another by a pilot wire.
In the event of a short-time or earth fault:
b if a given STR53UE trip unit detects the fault, it informs the upstream circuit
breaker, which applies the set time delay
b if the STR53UE trip unit does not detect the fault, the upstream circuit breaker
trips after its shortest time delay.
In this manner, the fault is cleared rapidly by the nearest circuit breaker.
The thermal stresses on the circuits are minimised and time discrimination is
maintained throughout the installation.
The STR53UE trip unit can handle only the downstream end of a zone selective
interlocking function. Consequently, the ZSI option cannot be implemented
between two Compact NS circuit breakers.
Opto-electronic outputs
Using opto-transistors, these outputs ensure total isolation between the internal
circuits of the trip unit and the circuits wired by the user.
Communications option (COM)
This option transmits data to Digipact distribution monitoring and control modules.
Transmitted data:
b settings
b phase and neutral currents (rms values)
b highest current of the three phases
b overload-condition alarm
b cause of tripping (overload, short-circuit, etc.).
56
E88739
MP DC trip units
Im(A)
30005000
4400
2500
3500
3800
5700
2000
4000
In Im
Magnetic trip units for Compact NS400/630 three-pole, type H circuit breakers.
These trip units are specifically designed to protect DC distribution systems.
They are not interchangeable. The circuit breaker and trip unit are supplied
fully assembled.
built-in trip units
circuit breaker
Compact NS400H
Compact NS630H
short-circuit protection (magnetic)
pick-up (A)
Im
MP1
MP2
MP3
b
b
b
b
b
adjustable
800...1600
adjustable
1250...2500
adjustable
2000...4000
57
6.2. Control units
characteristics
In short
Micrologic for Compact
NS630b to 3200
Protection
Protection thresholds and delays are set using the adjustment dials.
Overload protection
True rms long-time protection.
Thermal memory: thermal image before and after tripping.
Setting accuracy may be enhanced by limiting the setting range using a different
long-time rating plug.
Overload protection can be cancelled using a specific LT rating plug "Off".
E88740
Micrologic 2.0 and 5.0 control units
protect power circuits. Micrologic 5.0
offers time discrimination for shortcircuits as well.
Short-circuit protection
Short-time (rms) and instantaneous protection.
Selection of I2t type (ON or OFF) for short-time delay.
Neutral protection
On three-pole circuit breakers, neutral protection is not possible.
On four-pole circuit breakers, neutral protection may be set using a threeposition switch: neutral unprotected (4P 3d), neutral protection at 0.5 In (4P 3d +
N/2) or neutral protection at In (4P 4d).
Micrologic 5.0
Indications
Overload indication by alarm LED on the front; the LED goes on when the current
exceeds the long-time trip threshold.
Test
A mini test kit or a portable test kit may be connected to the test connector on the
front to check circuit-breaker operation after installing the trip unit or accessories.
Note.
Micrologic A control units come with a transparent lead-seal cover as standard.
1
Ir
long time
.7
.6
.5
.4
.8
x In
tr
8
(s) 4
.9
12
16
.95 2
.98 1
20
24
1
.5
short time
3
Isd
4
5
3
2.5
6
2
8
1.5
10
x Ir
setting
2
alarm
5
@ 6 Ir
tsd
(s)
.4 .4 .3
.3
.2
.1
on
Ii
.2
.1
0
I t off
2
delay
instantaneous
4
3
6 8 10
12
15
off
2
x In
4
test
6
1
2
3
4
5
6
58
long-time threshold and tripping delay
overload alarm (LED)
short-time pick-up and tripping delay
instantaneous pick-up
fixing screw for long-time rating plug
test connector.
Micrologic 2.0
long time
current setting (A)
Ir = In x …
tripping between 1.05 and 1.20 Ir
time delay (s)
accuracy 0 to -30% tr at 1.5 x Ir
accuracy 0 to -20% tr at 6 x Ir
accuracy 0 to -20% tr at 7.2 x Ir
thermal memory
Isd = Ir x …
2.5
3
4
5
6
500
20
13.8
600
24
16.6
8
10
t
Ir
tr
Isd
I
fixed: 20 ms
Micrologic 5.0
long time
current setting (A)
Ir = In x …
tripping between 1.05 and 1.20 Ir
time delay (s)
accuracy 0 to -30% tr at 1.5 x Ir
accuracy 0 to -20% tr at 6 x Ir
accuracy 0 to -20% tr at 7.2 x Ir
thermal memory
instantaneous
pick-up (A)
accuracy ± 10%
2
1
0
protection
short time
pick-up (A)
accuracy ± 10%
time delay (ms) at 10 x Ir
1.5
0.98
0.4
0.5
0.6
0.7
0.8
0.9
0.95
other ranges or disable by changing rating plug
12.5 25
50
100
200 300
400
0.5
1
2
4
8
12
16
0.34 0.69 1.38 2.7
5.5
8.3
11
20 minutes before and after tripping
Isd = Ir x …
1.5
2
2.5
3
4
I 2t Off
I2t On
tsd (max resettable time)
tsd (max break time)
0
20
80
0.1
0.1
80
140
0.2
0.2
140
200
0.3
0.3
230
320
0.4
0.4
350
500
Ii = In x …
2
3
4
6
8
settings
5
6
E88742
instantaneous
pick-up (A)
accuracy ± 10%
time delay
0.4
0.5
0.6
0.7
0.8
0.9
0.95
other ranges or disable by changing rating plug
12.5 25
50
100
200 300
400
0.5
1
2
4
8
12
16
0.34 0.69 1.38 2.7
5.5
8.3
11
20 minutes before and after tripping
E88741
protection
0.98
1
500
20
13.8
600
24
16.6
t
tr
Isd
tsd
8
Ii
10
0
10
12
Ir
15
I
off
59
6.2. Control units
characteristics
In short
Micrologic A "ammeter"
Protection settings .................................................
Protection thresholds and delays are set using the adjustment dials.
The selected values are momentarily displayed in amperes and in seconds.
Overload protection
True rms long-time protection.
Thermal memory: thermal image before and after tripping.
Setting accuracy may be enhanced by limiting the setting range using a different
long-time rating plug.
The long-time rating plug "OFF" enables to cancel the overload protection.
Micrologic A control units protect
power circuits.
They also offer measurements,
display, communication and current
maximeters. Version 6 provides
earth-fault protection, version 7
provides earth-leakage protection.
Short-circuit protection
Short-time (rms) and instantaneous protection.
Selection of I2t type (ON or OFF) for short-time delay.
E88743
Micrologic 6.0 A
9
10
Dt= IDn=
tsd= tr=
Isd=
Ii= Ir=
Ig=
tg=
MAX
s
kA
11
Earth fault protection
Residual or source ground return.
Selection of I2t type (ON or OFF) for delay.
Residual earth-leakage protection (Vigi).
Operation without an external power supply.
d Protected against nuisance tripping.
k DC-component withstand class A up to 10 A.
Neutral protection
On three-pole circuit breakers, neutral protection is not possible.
On four-pole circuit breakers, neutral protection may be set using a threeposition switch: neutral unprotected (4P 3t), neutral protection at 0.5 In (4P 3t + N/
2), neutral protection at In (4P 4t).
Zone selective interlocking (ZSI)
A ZSI terminal block may be used to interconnect a number of control units to
provide total discrimination for short-time and earth-fault protection, without a
delay before tripping.
100 %
40 %
12
"Ammeter" measurements ....................................
13
Micrologic A control units measure the true rms value of currents.
A digital LCD screen continuously displays the most heavily loaded phase (Imax)
or displays the I1, I2, I3, IN, Ig, I∆n, stored-current (maximeter) and setting values by
successively pressing the navigation button.
The optional external power supply makes it possible to display currents < 20% In.
menu
long time
Ir
1
.7
.6
.5
.4
tr
8
(s) 4
.9
12
16
.95 2
.98 1
20
24
1
.5
.8
x In
Isd
4
5
3
2.5
6
2
8
1.5
10
x Ir
tsd
Ig
tg
(s)
.4 .4 .3
.3
.2
.1
on
setting
D
C
B
A
5
E
F
G
H
J
ground fault
1
2
3
4
5
6
7
8
9
10
11
12
13
7
@ 6 Ir
short time
3
2
alarm
Ii
.2
.1
0
I t off
2
delay
(s)
on
2
I t
4
3
6 8 10
12
15
off
2
x In
test
.4 .4 .3
.3
.2
.1
instantaneous
.2
.1
0
off
4
6
8
long-time current setting and tripping delay
overload signal (LED)
short-time pick-up and tripping delay
instantaneous pick-up
earth-leakage or earth-fault pick-up and tripping delay
earth-leakage or earth-fault test button
long-time rating plug screw
test connector
lamp test, reset and battery test
indication of tripping cause
digital display
three-phase bargraph and ammeter
navigation buttons.
60
menu
Communication option
In conjunction with the COM communication option, the control unit transmits the
following:
b setting values
b all "ammeter" measurements
b tripping causes
b maximeter reset.
Note.
Micrologic A control units come with a transparent lead-seal cover as standard.
Micrologic 2.0 A
long time
current setting (A)
Ir = In x …
tripping between 1.05 and 1.20 x Ir
time delay (s)
accuracy: 0 to -30 %
accuracy: 0 to -20 %
accuracy: 0 to -20 %
thermal memory
(1) with tsd = 0.4 off, tr = 0.5 s.
residual earth leakage (Vigi)
sensitivity (A)
accuracy: 0 to -20 %
time delay (ms.)
1.5
8
10
Ir
tr
2
2.5
3
4
5
6
0
I
menu
I1
I2
I3
IN
no auxiliary source (where I > 20 % In)
I 1 max I 2 max I 3 max I N max
500
20
13.8
600
24
16.6
2
2.5
3
4
I 2t Off
I2t On
tsd (max resettable time)
tsd (max break time)
0
20
80
0.1
0.1
80
140
0.2
0.2
140
200
0.3
0.3
230
320
0.4
0.4
350
500
Ii = In x …
2
3
4
6
8
10
12
15
off
Ig = In x …
In y 400 A
400 A < In y 1200 A
In > 1200 A
settings
I 2t Off
I2t On
tg (max resettable time)
tg (max break time)
Micrologic 6.0 A
A
B
C
0.3
0.3
0.4
0.2
0.3
0.4
500
640
720
0
0.1
0.2
0.1
0.2
20
80
140
80
140
200
D
0.5
0.5
800
0.3
0.3
230
320
E
0.6
0.6
880
0.4
0.4
350
500
F
0.7
0.7
960
G
0.8
0.8
1040
H
0.9
0.9
1120
J
1
1
1200
I∆
∆n
Micrologic 7.0 A
0.5 1
2
3
5
7
settings
t∆n (max resettable time)
t∆n (max break time)
60
80
140
350
350
500
800
800
1000
ammeter
continuous current measurements
measurements from 20 to 200 % of In
accuracy: 1.5 % (including sensors)
maximeters
230
230
320
t
Ir
tr
Isd
1.5
140
140
200
6
1
Isd = Ir x …
settings
5
0.98
8
tsd
10
Ii
0
E88744
tr at 1.5 x Ir
tr at 6 x Ir
tr at 7.2 x Ir
Micrologic 5.0 / 6.0 / 7.0 A
0.4
0.5
0.6
0.7
0.8
0.9
0.95
other ranges or disable by changing rating plug
12.5 25
50
100
200
300
400
0.5
1
2
4
8
12
16
0.34 0.69 1.38 2.7
5.5
8.3
11
20 minutes before and after tripping
E88742
Micrologic 5.0 / 6.0 / 7.0 A
long time
current setting (A)
Ir = In x …
tripping between 1.05 and 1.20 x Ir
time delay (s)
accuracy: 0 to -30 %
accuracy: 0 to -20 %
accuracy: 0 to -20 %
thermal memory
time delay (ms)
at In or 1200 A
600
24
16.6
Micrologic 2.0 A
protection
earth fault
pick up (A)
accuracy: ±10 %
500
20
13.8
t
fixed: 20 ms
continuous current measurements
measurements from 20 to 200 % of In
accuracy: 1.5% (including sensors)
maximeters
instantaneous
pick-up (A)
accuracy: ±10 %
1
Isd
Isd = Ir x …
ammeter
short time
pick-up (A)
accuracy: ±10 %
time delay (ms) at 10 Ir
0.98
I
t
2
I t on
Ig
2
tg
I t off
0
10
30
t
I
IDn
tDn
0
I
menu
Micrologic 5.0 / 6.0 / 7.0 A
I1
I2
I3
IN
Ig
I ∆n
no auxiliary source (where I > 20 % In)
I 1 max I 2 max I 3 max I N max I g max I ∆n
20
E88745
instantaneous
pick-up (A)
accuracy: ±10 %
time delay
tr at 1.5 x Ir
tr at 6 x Ir
tr at 7.2 x Ir
0.4
0.5
0.6
0.7
0.8
0.9
0.95
other ranges or disable by changing rating plug
12.5 25
50
100
200
300
400
0.5
1
2
4
8
12
16
0.34(1) 0.69 1.38 2.7
5.5
8.3
11
20 minutes before and after tripping
E88741
protections
max
Note:
All current-based protection functions require no auxiliary source.
The test / reset button resets maximeters, clears the tripping indication and tests
the battery.
61
6.2. Control units
characteristics
In short
Micrologic P "power"
Protection settings ........................................
menu
The adjustable protection functions are identical to those of Micrologic A
(overloads, short-circuits, earth-fault and earth-leakage protection).
Micrologic P control units include all the
functions offered by Micrologic A.
In addition, they measure voltages and
calculate power and energy values.
They also offer new protection functions
based on currents, voltages, frequency
and power reinforce load protection.
Micrologic 6.0 P
E88746
+
9
10
I (A)
Trip
2000A
11
Double setting
Within the range determined by the adjustment dial, fine adjustment of thresholds
(to within one ampere) and time delays (to within one second) is possible on the
keypad or remotely using the COM option.
IDMTL setting
Coordination with fuse-type or medium-voltage protection systems is optimised
by adjusting the slope of the overload-protection curve. This setting also ensures
better operation of this protection function with certain loads.
Neutral protection
On three-pole circuit breakers, neutral protection may be set using the keypad or
remotely using the COM option, to one of four positions: neutral unprotected (4P
3t), neutral protection at 0.5 In (4P 3t + N/2), neutral protection at In (4P 4t) and
neutral protection at 2 In (4P 3t + 2N). Neutral protection at 2 In is used when the
neutral conductor is twice the size of the phase conductors (major load
imbalance, high level of third order harmonics).
On four-pole circuit breakers, neutral protection may be set using a threeposition switch or the keypad: neutral unprotected (4P 3t), neutral protection at
0.5 In (4P 3t + N/2), neutral protection at In (4P 4t). Neutral protection produces
no effect if the long-time curve is set to one of the IDMTL protection settings.
24s
Programmable alarms and other protection ........
20 kA
0.4s
Depending on the thresholds and time delays set using the keypad or remotely
using the COM option, the Micrologic P control unit monitors currents and
voltage, power, frequency and the phase sequence. Each threshold overrun is
signalled remotely via the COM option. Each threshold overrun may be combined
with tripping (protection) or an indication carried out by an optional M2C or M6C
programmable contact (alarm), or both (protection and alarm).
Off
13
14
12
15
Load shedding and reconnection.........................
Load shedding and reconnection parameters may be set according to the power
or the current flowing through the circuit breaker. Load shedding is carried out by
a supervisor via the COM option or by an M2C or M6C programmable contact.
long time
Ir
1
.7
.6
.5
.4
tr
8
(s) 4
.9
12
16
.95 2
.98 1
20
24
1
.5
.8
x In
16
5
Isd
4
5
3
2.5
6
2
8
1.5
10
x Ir
tsd
Ig
tg
D
C
B
A
FG
H
J
ground fault
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
62
(s)
Ii
.4 .4 .3
.3
.2
.1
on
setting
E
7
Measurements ........................................................
@ 6 Ir
short time
3
2
alarm
.2
.1
0
I t off
2
delay
(s)
on
2
I t
6 8 10
4
12
3
15
off
2
x In
test
.4 .4 .3
.3
.2
.1
instantaneous
.2
.1
0
off
4
6
8
long-time current setting and tripping delay
overload signal (LED)
short-time pick-up and tripping delay
instantaneous pick-up
earth-leakage or earth-fault pick-up and tripping delay
earth-leakage or earth-fault test button
long-time rating plug screw
test connector
lamp + battery test and indications reset
indication of tripping cause
high-resolution screen
measurement display
maintenance indicators
protection settings
navigation buttons
hole for settings lockout pin on cover.
The Micrologic P control unit calculates in real time all the electrical values (V, A,
W, VAR, VA, Wh, VARh, VAh, Hz), power factors and crest factors.
The Micrologic P control unit also calculates demand current and demand power
over an adjustable time period. Each measurement is associated with a minimeter
and a maximeter.
In the event of tripping on a fault, the interrupted current is stored. The optional
external power supply makes it possible to display the value with the circuit
breaker open or not supplied.
Note:
Micrologic P control units come with a non-transparent lead-seal cover as
standard.
Histories and maintenance indicators ..................
The last ten trips and alarms are recorded in two separate history files.
Maintenance indications (contact wear, operation cycles, etc.) are recorded for
local access.
Option de signalisation par contact programmables
The M2C (two contacts) and M6C (six contacts) auxiliary contacts may be used
to signal threshold overruns or status changes. They can be programmed using
the keypad on the Micrologic P control unit or remotely using the COM option.
Communication option (COM)
The communication option may be used to:
b remotely read and set parameters for the protection functions
b transmit all the calculated indicators and measurements
b signal the causes of tripping and alarms
b consult the history files and the maintenance-indicator register.
An event log and a maintenance register, stored in control-unit memory but not
available locally, may be accessed in addition via the COM option.
63
6.2. Control units
characteristics
Micrologic P "power"
Micrologic 5.0 / 6.0 / 7.0 P
long time (rms)
current setting (A)
Ir = In x …
tripping between 1.05 and 1.20 x Ir
time delay (s)
accuracy: 0 to -30 %
accuracy: 0 to -20 %
accuracy: 0 to -20 %
IDMTL setting
curve slope
thermal memory
(1) with tsd = 0.4 off, tr = 0.5 s
time delay (ms.)
at In or 1200 A
residual earth leakage (Vigi)
sensitivity (A)
accuracy: 0 to -20 %
time delay (ms.)
tr
IDMTL
2.5
3
4
5
6
8
10
I2t Off
I2t On
tsd (max resettable time)
tsd (max break time)
0
20
80
0.1
0.1
80
140
0.2
0.2
140
200
0.3
0.3
230
320
0.4
0.4
350
500
Ii = In x …
2
3
4
6
8
10
12
15
OFF
Ig = In x …
In y 400 A
400 A < In y 1200 A
In > 1200 A
settings
I2t Off
I2t On
tg (max resettable time)
tg (max break time)
Micrologic 6.0 P
A
B
C
0.3
0.3
0.4
0.2
0.3
0.4
500
640
720
0
0.1
0.2
0.1
0.2
20
80
140
80
140
200
D
0.5
0.5
800
0.3
0.3
230
320
E
0.6
0.6
880
0.4
0.4
350
500
F
0.7
0.7
960
G
0.8
0.8
1040
H
0.9
0.9
1120
J
1
1
1200
I∆
∆n
Micrologic 7.0 P
0.5
1
2
3
5
settings
t∆n (max resettable time)
60
60
140
140
230
230
350
350
800
800
t∆n (max break time)
140
200
320
500
1000
settings
E88744
2
Isd
tsd
I
t
2
I t on
Ig
2
I t off
tg
0
7
10
20
30
t
I
IDn
tDn
0
I
Micrologic 5.0 / 6.0 / 7.0 P
I imbalance
Imax demand: I1, I2, I3, IN, Ig
time delay
1 to 40 s.
0 to 1500 s.
voltage
voltage imbalance
minimum voltage
maximum voltage
U imbalance
Umin
Umax
0.02 to 0.3 Uaverage
60 to 690 V between phases
100 to 930 V between phases
1 to 40 s.
0.2 to 5 s.
0.2 to 5 s.
power
reverse power
rP
5 to 500 kW
0.2 to 20 s.
frequency
minimum frequency
maximum frequency
Fmin
Fmax
45 to 400 Hz
45 to 540 Hz
0.2 to 5 s.
0.2 to 5 s.
Ø1/2/3 or Ø1/3/2
instantaneous
t
threshold
threshold
delay
delay
0
Ư
load shedding and reconnection
measured value
current
power
Ir
0
1.5
threshold
0.05 to 0.6 Imax
0.4 In at short-time pick-up
phase sequence
sequence
600
24
16.6
t
Ii
Isd = Ir x …
alarms and other protection
current
current imbalance
maximum demand current
500
20
13.8
E88745
earth fault
pick-up (A)
accuracy: ±10 %
1
E88748E
instantaneous
pick-up (A)
accuracy: ±10 %
0.98
I
P
I/U/P/F
Micrologic 5.0 / 6.0 / 7.0 P
threshold
0.5 to 1 Ir per phases
200 kW to 10 MW
time delay
20% tr to 80% tr.
10 to 3600 s.
E88749E
short time (rms)
pick-up (A)
accuracy: ±10 %
time delay (ms.) at 10 x Ir
tr at 1.5 x Ir
tr at 6 x Ir
tr at 7.2 x Ir
+
Micrologic 5.0 / 6.0 / 7.0 P
0.4
0.5
0.6
0.7
0.8
0.9
0.95
other ranges or disable by changing rating plug
12.5 25
50
100
200 300
400
0.5
1
2
4
8
12
16
0.34 (1) 0.69 1.38 2.7
5.5
8.3
11
SIT
VIT
EIT
HVFuse DT
20 minutes before and after tripping
E88747
protection
t
threshold
threshold
delay
delay
0
Note:
All current-based protection functions require no auxiliary source.
Voltage-based protection functions are connected to AC power via a voltage
measurement input built into the circuit breaker.
64
I/P
E88751
E88750
Navigation from one display to another is intuitive. The six buttons on the keypad
provide access to the menus and easy selection of values. When the setting
cover is closed, the keypad may no longer be used to access the protection
settings, but still provides access to the displays for measurements, histories,
indicators, etc.
Measurements ........................................................
Instantaneous values
The value displayed on the screen is refreshed every second.
Minimum and maximum values of measurements are stored in memory
(minimeters and maximeters).
Display of a maximum
current .
currents
I
rms
I
max rms
E88753
E88752
Default display.
A
A
A
A
1
2
e-fault
1
2
e-fault
3
N
e-leakage
3
N
e-leakage
V
V
V
%
12
23
31
1N
2N
3N
(U12 + U23 + U31 ) / 3
W, Var, VA
Wh, VARh, VAh
totals
totals
totals
totals
total
voltages
U
V
U
U
rms
rms
average rms
imbalance
power, energy
P active , Q reactive, S apparent
E active, E reactive, E apparent
power factory
Display of a power.
consumed
supplied
frequencies
F
Hz
Demand metering
The demand is calculated over a fixed or sliding time window that may be
programmed from 5 to 60 minutes. According to the contract signed with the
power supplier, an indicator associated with a load shedding function makes it
possible to avoid or minimise the costs of overrunning the subscribed power.
Maximum demand values are systematically stored and time stamped
(maximeter).
E88755
E88754
Display of a voltage.
PF
consumed - supplied
currents
I
demand
I
max demand
A
A
A
A
1
2
e-fault
1
2
e-fault
3
N
e-leakage
3
N
e-leakage
power
Display of a frequency.
Display of a demand power.
P, Q, S
P, Q, S
demand
max demand
W, Var, VA
W, Var, VA
totals
totals
Histories ..................................................................
E88757
E88756
Minimeters and maximeters
Only the current and power maximeters may be displayed on the screen.
The last ten trips and alarms are recorded in two separate history files that may
be displayed on the screen.
b tripping history:
v type of fault
v date and time
v values measured at the time of tripping (interrupted current, etc.).
b alarm history:
v type of fault
v date and time
v values measured at the time of the alarm.
Display of a tripping history.
Display after tripping.
Maintenance indicators..........................................
A number of maintenance indicators may be called up on the screen:
b contact wear
b operation counter:
v cumulative total
v total since last reset.
65
E88762
6.2. Control units
characteristics
POWERLOGIC System Manager Demo
File Edit View Setup Control Display
Reports
Micrologic P "power"
Time
Ready
With the communication option
Tools Window Help
5 seconds
Sampling Mode : MANUAL
Event
Additional measurements, maximeters and minimeters
Certain measured or calculated values are only accessible with the COM
communication option:
b I peak /2, (I1 + I2 + I3)/3, I imbalance
b load level in % Ir
b total power factor
The maximeters and minimeters are available only via the COM option for use
with a supervisor.
Module
ONLINE: DEMO
No working system
Display of an event log on a supervisor.
9:30
Event log
All events are time stamped.
b trips
b beginning and end of alarms
b modifications to settings and parameters
b counter resets
b system faults:
v fallback position
v thermal self-protection
b loss of time
b overrun of wear indicators
b test-kit connections
b etc.
Maintenance register
Used as an aid in troubleshooting and to better plan for device maintenance
operations.
b highest current measured
b operation counter
b number of test-kit connections
b number of trips in operating mode and in test mode
b contact-wear indicator.
Additional technical characteristics
Setting the display language
System messages may be displayed in six different languages. The desired
language is selected via the keypad.
Protection functions
All current-based protection functions require no auxiliary source. Voltage-based
protection functions are connected to AC power via a voltage measurement input
built into the circuit breaker.
Measurement functions
Measurement functions are independent of the protection functions.
The high-accuracy measurement module operates independently of the
protection module, while remaining synchronised with protection events.
Measurement-calculation mode
b measurement functions implement the new "zero blind time" concept which
consists in continuously measuring signals at a high sampling rate. The traditional
"blind window" used to process samples no longer exists. This method ensures
accurate energy calculations even for highly variable loads (welding machines,
robots, etc.).
b energies are calculated on the basis of the instantaneous power values, in two
manners:
v the traditional mode where only positive (consumed) energies are considered
v the signed mode where the positive (consumed) and negative (supplied)
energies are considered separately.
66
Accuracy of measurements (including sensors)
cvoltage (V) 1%
b current (A) 1.5%
b frequency (Hz) 0.1 Hz
b power (W) and energy (Wh) 2.5%
Stored information
The fine setting adjustments, the last 100 events and the maintenance register
remain in the control-unit memory even when power is lost.
Time-stamping
Time-stamping is activated only if an external power supply module is present
(max. drift of 1 hour per year).
Reset
An individual reset, via the keypad or remotely, acts on alarms, minimum and
maximum data, peak values, the counters and the indicators.
67
In short
6.2. Control units
characteristics
In addition to the Micrologic P functions, the Micrologic H control unit
offers:
b in-depth analysis of power quality including calculation of harmonics and the
fundamentals
b diagnostics aid and event analysis through waveform capture
b enhanced alarm programming to analyse and track down a disturbance on the
AC power system.
Micrologic H control units include all the
functions offered by Micrologic P.
Integrating significantly enhanced
calculation and memory functions, the
Micrologic H control unit offers in-depth
analysis of power quality and detailed
event diagnostics. It is intended for
operation with a supervisor.
E88759
Micrologic H "harmonics"
Micrologic 7.0 H
Measurements ........................................................
The Micrologic H control unit offers all the measurements carried out by
Micrologic P, with in addition:
b phase by phase measurements of:
v power, energy
v power factors
b calculation of:
v current and voltage total harmonic distortion (THD)
v current, voltage and power fundamentals (50 Hz)
v current and voltage harmonics up to the 31st order.
Instantaneous values displayed on the screen
currents
I
U
P
E
I
rms
I
max rms
(A)
A
A
A
A
1
2
e-fault
1
2
e-fault
3
N
e-leakage
3
N
e-leakage
V
V
V
%
12
23
31
1N
2N
3N
(U12 + U23 + U31) / 3
W, Var, VA
Wh, VARh, VAh
totals 1
2
3
totals consumed - supplied
totals consumed
totals supplied
total 1
2
3
voltages
(V)
U
V
U
U
(kW)
rms
rms
average rms
imbalance
power, energy
(kWh)
P
E
Harmonics
active,
active,
Q reactive , S apparent
E reactive, E apparent
power factor
PF
frequencies
F
Hz
power-quality indicators
total fundamentals
U
THD
%
U
U and I harmonics
amplitude
3
Harmonics 3, 5, 7, 9, 11 and 13, monitored by electrical utilities, are
long time
Ir
.7
.6
.5
.4
tr
8
(s) 4
.9
12
16
.95 2
.98 1
20
24
1
.5
.8
x In
(A)
setting
3
2
1
.5
5
Demand measurements
Similar to the Micrologic P control unit, the demand values are calculated over a
fixed or sliding time window that may be set from 5 to 60 minutes.
@ 6 Ir
short time
Isd
4
5
3
2.5
6
2
8
1.5
10
x Ir
IÐn
alarm
tsd
(s)
.4 .4 .3
.3
.2
.1
2
on
I t
earth leakage
.2
.1
0
off
delay
Ðt
(ms)
230
10
140
20
30
60
7
Ii
currents
instantaneous
6 8 10
4
12
3
15
off
2
x In
I
demand
I
max demand
test
350
800
I P Q S
I
5 7 9 11 13
displayed on the screen.
A
A
A
A
1
2
e-fault
1
2
e-fault
3
N
e-leakage
3
N
e-leakage
power
P, Q, S
P, Q, S
demand
max demand
W, Var, VA
W, Var, VA
totals
totals
Maximeters
Only the current maximeters may be displayed on the screen.
Histories and maintenance indicators
These functions are identical to those of the Micrologic P.
Note:
Micrologic H control units come with a non-transparent lead-seal cover as
standard.
68
E88760
POWERLOGIC System Manager Demo
Edit View Setup Control Display
File
Reports
Tools Window Help
Sampling Mode : MANUAL
Time
5 seconds
Event
With the communication option
Module
Phase A-N Voltage - Harmonics Analysis
Phase 1-N
1,20
Additional measurements, maximeters and minimeters
Certain measured or calculated values are only accessible with the COM
communication option:
b I peak / 2, (I1 + I2 + I3)/3, I imbalance
b load level in % Ir
b power factor (total and per phase)
b voltage and current THD
b K factors of currents and average K factor
b crest factors of currents and voltages
b all the fundamentals per phase
b fundamental current and voltage phase displacement
b distortion power and distortion factor phase by phase
b amplitude and displacement of current and voltage harmonics 3 to 31.
The maximeters and minimeters are available only via the COM option for use
with a supervisor.
Harmonics(RMS)
Fundamental:
1,00
RMS:
RMS-H:
0,80
Peak:
% Fundamental
CF:
THD:
0,60
H1: 118.09
H2: 0.01
H3: 0.45
H4: 0.03
H5: 0.45
H6: 0.04
H7: 1.27
H8: 0.05
H9: 0.42
H10: 0.01
H11: 1.03
H12: 0.07
OK
0,40
0,20
0,00
H2
H3
H4
H5
H6
H7
H8
H9
H10
H11
H12
Harmonics
ONLINE: DEMO
Ready
No working system
9:30
E88761
Display of harmonics up to 12th order.
POWERLOGIC System Manager Demo
Edit View Setup Control Display
File
Reports
5 seconds
Phase A Current
Phase A-N Voltage
642
167
321
83
0
-83
Waveform capture
The Micrologic H control unit stores the last 4 cycles of each instantaneous
current or voltage measurement. On request or automatically on programmed
events, the control unit stores the waveforms. The waveforms may be displayed
in the form of oscillograms by a supervisor via the COM option.
Tools Window Help
Sampling Mode : MANUAL
17
33
50
66
0
17
-321
33
66
50
Your Specific Device - Phase A-N Voltage
-642
-167
Harmonics(RMS)
Phase B-N Voltage
118.11
2.38
Peak:
83
0
118.08
RMS:
RMS-H:
167
-83
Fundamental:
166.86
CF:
17
33
50
1.41
THD:
2.02
-167
H1: 118.09
H2: 0.01
H3: 0.45
H4: 0.03
H5: 0.45
H6: 0.04
H7: 1.27
H8: 0.05
H9: 0.42
H10: 0.01
H11: 1.03
H12: 0.07
Event log and maintenance registers
The Micrologic H offers the same event log and maintenance register functions
as the Micrologic P.
OK
ONLINE: DEMO
Ready
No working system
9:30
E88762
Waveform capture.
Additional technical characteristics
POWERLOGIC System Manager Demo
File Edit View Setup Control Display
Reports
Event
Setting the display language
System messages may be displayed in six different languages. The desired
language is selected via the keypad.
Tools Window Help
Sampling Mode : MANUAL
Time
Enhanced alarm programming
Each instantaneous value can be compared to user-set high and low thresholds.
Overrun of a threshold generates an alarm. An alarm or combinations of alarms
can be linked to programmable actions, including circuit-breaker opening,
activation of a M2C or M6C contact, selective recording of measurements in a
log, waveform capture, etc.
5 seconds
Protection functions
All current-based protection functions require no auxiliary source. Voltage-based
protection functions are connected to AC power via a voltage measurement input
built into the circuit breaker.
Module
Measurement functions
Measurement functions are independent of the protection functions.
The high-accuracy measurement module operates independently of the
protection module, while remaining synchronised with protection events.
Ready
Log.
ONLINE: DEMO
No working system
9:30
Measurement-calculation mode
An analogue calculation function dedicated to measurements enhances the
accuracy of harmonic calculations and the power-quality indicators. The
Micrologic H control unit calculates electrical magnitudes using 1.5 x In dynamics
(20 x In for Micrologic P).
Measurement functions implement the new "zero blind time" concept
Energies are calculated on the basis of the instantaneous power values, in the
traditional and signed modes.
Harmonic components are calculated using the discrete Fourier transform
(DFT).
69
6.2. Control units
characteristics
Micrologic H "harmonics"
Accuracy of measurements (including sensors)
cvoltage (V) 1%
b current (A) 1.5%
b frequency (Hz) 0.1 Hz
b power (W) and energy (Wh) 2.5%
b total harmonic distortion 1%
Stored information
The fine-setting adjustments, the last 100 events and the maintenance register
remain in the control-unit memory even when power is lost.
Time-stamping
Time-stamping is activated only if an external power supply module is present
(max. drift of 1 hour per year).
Reset
An individual reset, via the keypad or remotely, acts on alarms, minimum and
maximum data, peak values, the counters and the indicators.
70
In short
6.3. Communication
characteristics
053172si
Integration of the circuit breaker or the
switch-disconnector in a supervison
system requires either the communicating
auxiliaries or the SC150 interface.
Compact devices fit perfectly in the SMS
Powerlogic electrical installation
management system by communicating
using Digipact protocols. An external
gateway offers communication via other
networks including:
b Profibus
b Ethernet…
Compact NS100 to 630
There are two possibilities for the 100 to 630 A range:
b communicating auxiliaries
They replace the standard auxiliaries and connect directly to the Digipact bus.
Three equipment levels:
v communicating auxiliary contacts, comprising:
- OF (on/off), SD (trip indication) and SDE (fault-trip indication) contacts
- electronic module
- prefabricated wiring.
v communicating auxiliary contacts and motor-mechanism module, comprising:
- OF (on/off), SD (trip indication) and SDE (fault-trip indication) contacts
- motor-mechanism module (220 V AC) (1)
- electronic module
- prefabricated wiring.
v communicating carriage switches for the chassis, comprising:
- CE / CD (connected/disconnected position) contacts
- electronic module
- wiring connector.
b SC150 interface
Using the SC150 interface, it is possible to integrate a device equipped with noncommunicating auxiliaries into a supervison system.
The SC150 interface is used to connect:
v the auxiliary contacts on the circuit breaker (OF, SD, SDE, SDV, CD, CE)
v the remote-operation system (on, off, reset)
v the communication output for the STR53UE and STR43ME electronic trip units
equipped with the COM option
v an unassigned digital input.
Compact with
communicating SC150
auxiliaries
device identification
address
rating
b
-
b
-
b
b
b
b
b
b
b
b
b
b
b
b
indication of status conditions
054481si
Compact NS equipped with communicating auxiliary contacts
and motor-mechanism module.
OF (on/off)
SD (trip indication)
SDE (fault-trip indication)
CE/CD (connected/disconnected position)
controls
ON/OFF
LED reset
protection settings
b
Reading of the protection settings
operating and maintenance aids
054516si
Withdrawable Compact NS on its chassis equipped with
communicating auxiliary contacts.
Measurements:
currents
Fault readings:
type of fault
Indications:
operation counter
b
b
b
b
(1) For voltages other than 220 V AC, use a standard motor-mechanism module (noncommunicating) together with an SC150 indication and control interface.
SC150 indication and control interface.
71
6.3. Communication
characteristics
In short
Masterpact NT / NW
For fixed devices, the COM option is made up of:
b a "device" communication module, installed behind the Micrologic control unit
and supplied with its set of sensors (OF, SDE ,PF and CH micro-contacts) and
its kit for connection to XF and MX communicating voltage releases.
For drawout devices, the COM option is made up of:
b a "device" communication module, installed behind the Micrologic control unit
and supplied with its set of sensors (OF, SDE, PF and CH micro-contacts) and
its kit for connection to XF and MX communicating voltage releases
b a "chassis" communication module supplied separately with its set of sensors
(CE, CD and CT contacts).
Status indication by the COM option is independent of the device indication
contacts. These contacts remain available for conventional uses.
056431si
The COM option is required for
integration of the circuit breaker or switchdisconnector in a supervision system.
Masterpact uses the Digipact or Modbus
communications protocol for full
compatibility with the SMS PowerLogic
electrical-installation management
systems. An external gateway is available
for communication on other networks:
b Profibus
b Ethernet…
Digipact or Modbus "Device" communication module
This module is independent of the control unit. It receives and transmits
information on the communication network. An infra-red link transmits data
between the control unit and the communication module.
Consumption: 30 mA, 24 V.
Digipact or Modbus "chassis" communication module
This module is independent of the control unit. With Modbus "chassis"
communication module, this module makes it possible to address the chassis
and to maintain the address when the circuit breaker is in the disconnected
position.
Consumption: 30 mA, 24 V.
Digipact "device"
communication module.
E88758E
XF and MX communicating voltage releases
The XF and MX communicating voltage releases are equipped for connection to
the "device" communication module.
The remote-tripping function (second MX or MN) are independent of the
communication option. They are not equipped for connection to the "device"
communication module.
communication
bus
++
us
CE
modb
CD
CCM
2
CT
056401si
Digipact "chassis"
communication module.
+
CCT
OF
SDE
PF
CH
CD
C
MX
XF
CE
C
4
5
056431si
1
Modbus "device"
communication module.
3
E45183si
Modbus "chassis"
communication module.
1 "Device" communication module
2 "Chassis" communication module
3 OF, SDE, PF and CH "device" sensors
4 CE, CD and CT "chassis" sensors
5 MX and XF release.
: hard wire
: communication bus
Note:
Eco COM is limited to the transmission of metering data and does not allow the
control of the circuit breaker.
72
Reports
Time
Overview of functions
Tools Window Help
Sampling Mode : MANUAL
5 seconds
Event
Module
Phase A-N Voltage - Harmonics Analysis
Phase 1-N
1,20
Harmonics(RMS)
Fundamental:
1,00
RMS:
RMS-H:
0,80
% Fundamental
E88760
POWERLOGIC System Manager Demo
Edit View Setup Control Display
File
Peak:
CF:
THD:
0,60
H1: 118.09
H2: 0.01
H3: 0.45
H4: 0.03
H5: 0.45
H6: 0.04
H7: 1.27
H8: 0.05
H9: 0.42
H10: 0.01
H11: 1.03
H12: 0.07
OK
0,40
0,20
0,00
H2
H3
H4
H5
H6
H7
H8
H9
H10
H11
The Masterpact circuit breakers and switch-disconnectors are compatible with
the Digipact or Modbus COM option.
The COM option may be used with all types of control units to:
b identify the device
b indicate status conditions
b control the device.
Depending on the different types of Micrologic (A, P, H) control units, the COM
option also offers:
b setting of the protection and alarms functions
b analysis of the AC-power parameters for operating-assistance and
maintenance purposes.
H12
Harmonics
Ready
ONLINE: DEMO
No working system
9:30
switch-disconnector
circuit breaker with
with communic. bus
Digipact
Modbus
communication bus
Digipact
Modbus
b
-
b
-
A
A
P
P
H
H
A
A
A
A
P
P
H
H
b
b
b
b
b
b
b
b
A
A
A
A
A
P
P
P
P
P
b
-
b
-
A
A
device identification
address
calibre
type of device
type of control unit
type of long-time rating plug
A
A
P
P
P
P
P
H
H
H
H
H
H
H
H
H
H
A
A
A
A
A
P
P
P
P
P
H
H
H
H
H
P
H
A
P
H
P
H
A
P
P
H
H
P
H
H
P
P
P
H
H
H
H
P
P
H
H
status indications
ON/OFF OF
spring charged CH
ready to close PF
fault-trip SDE
connected/disconnected/test
position CE/CD/CT
controls
ON/OFF MX/XF
spring charging
reset of the mechanical
indicator
protections and alarms settings
reading of protections settings
writing of fine settings in the range
imposed by the adjustment dials
reading/writing of alarms (délestage, relestage, M2C…)
reading/writing of alarms personnalisables
operating and maintenance aids
measurement:
current
voltages, frequency, power, etc.
power quality: fundamental, harmonics
programming of demand metering
fault readings:
type of fault
interrupted current
waveform capture:
on faults
on demand or programmed
histories and logs:
trip history
alarm history
event logs
indicators:
counter operation
contact wear
maintenance register
A
P
P
H
H
A
A
H
H
A
P
H
A
P
P
P
H
H
H
P
P
P
H
H
H
Note:
See the description of the Micrologic control units for further details on protection
and alarms, measurements, waveform capture, histories, logs and maintenance
indicators.
73
E88763E
6.3. Communication
characteristics
Masterpact, Compact NS
in a communication network
Software
Communication
interface
RS 232C,Ethernet
RS 485
Communication
Bus
IN
LIN GER
MERSV
pulsar
JBus
BBus
com
24V
OK
error
1 3
N°1
N°1
com
error
Data concentrator
DC150
Device
OF24
MN
Com
CD3
CE6
CD2
CE5
UC1
UC2
UC3
UC4
M2C
UC2
SDE2
CE3
CE2
MX1
XF
PF
CD3
CD1
CD2
814
824
812
834
822
811
832
821
831
MCH
OC24
OF23
OC23
OF22
OC22
OF21
OC21
CE1
CD1
CE4
CE1
CE2
314
CE3
324
312
SDE1
334
322
311
332
K2 84
321
82
UC4 M2C/M6C
Q3 184/
331
UC3
V3 484/ 474/ Q2 182
K1 81
UC2
F2 +
2
1 181/
UC1
M2 M3 4 VN V V1 471/ Q
Com
Z5 M1
3 T
E5 E6 4 Z3 Z4 T T1 T2 F1
E3 E E2 Z1 Z2
E1
MCHB
PF
2
XF
254
B3
MX1
A2
252
MN/MX2 12 C2
B1
A3
251
D2/ C 13 C3
A1
/C
C1
D1/ C11
OF14
OC14
OF13
OC13
OF12
OF11
OC12
OF24
CT1
CT2
914
CT3
924
912
OF1
934
922
OF2
911
14
932
OF3
921
24
12
OF4
931
OF11114 44 34 32 22
11
OF12124
21
42
OF13134
31
112
OF14144
41
122
OF21214
111
132
OF22224
121
142
OF23234
131
212
OF24244
141
222
211
232
221
242
231
241
MN
Com
CD3
CE6
CD2
CE5
UC1
UC2
UC3
UC4
M2C
UC2
SDE2
CE3
CE2
MX1
XF
PF
CD3
CD1
CD2
814
824
812
834
822
811
832
821
831
MCH
OC24
OF23
OC23
OF22
OC22
OF21
OC21
CE1
CD1
CE4
CE1
CE2
314
CE3
324
312
SDE1
334
322
311
332
K2 84
321
82
UC4 M2C/M6C
Q3 184/
331
UC3
V3 484/ 474/ Q2 182
K1 81
UC2
F2 +
2
1 181/
UC1
M2 M3 4 VN V V1 471/ Q
Com
Z5 M1
3 T
E5 E6 4 Z3 Z4 T T1 T2 F1
E3 E E2 Z1 Z2
E1
MCHB
PF
2
XF
254
B3
MX1
A2
252
MN/MX2 12 C2
B1
A3
251
D2/ C 13 C3
A1
/C
C1
D1/ C11
OF14
OC14
OF13
OC13
OF12
OF11
OC12
CT1
CT2
914
CT3
924
912
OF1
934
922
OF2
911
14
932
OF3
921
24
12
OF4
931
OF11114 44 34 32 22
11
OF12124
21
42
OF13134
31
112
OF14144
41
122
OF21214
111
132
OF22224
121
142
OF23234
131
212
OF24244
141
222
211
232
221
242
231
241
ct
compa
0NH
Reset
push
push
70
NX 32
ON
Ir
Ig
Isd I
Ii
Ap
reset
H2
Ue (V)
220/440
525
690
OFF
Micrologic
Icu (kA)
100
100
85
Icw 85kA/1s
cat.B
d
discharge
Ics =
100%
Icu
50/60Hz
O OFF
947-2
IEC
EN 60947-2
BS CEI
UTE
VDE
UNE
AS NEMA
NB25 Uimp 8kV.
Icu
Ui 750V.
(kA)
Ue
100
(V)
0
70
220/245
65
380/41
50
440 5
10
500/520
85
660/69
250
% Icu
Ics=100
cat A
-2
BS CEI
IEC947
VDE
UNE
2
NEMA
UTE
Im 10
012
53
compactL
NS250 Uimp 8kV.
Ui 750V. Icu (kA)
150
Ue(V)
150
220/240
130
380/415
70
440
20
500
100
600/690
0
125/16
push
to
trip
O OFF
9
1
.9
.8
8
Reset
push
d
discharge
push
70
NX 32
ON
Ir
Ig
Isd I
Ii
Ap
reset
H2
Ue (V)
220/440
525
690
OFF
Micrologic
Icu (kA)
100
100
85
Icw 85kA/1s
cat.B
d
discharge
Æ5...8
Ics =
100%
ct
compa
Icu
0NH
NB25 Uimp 8kV.
Icu
Ui 750V.
(kA)
Ue
100
(V)
0
70
220/245
65
380/41
50
440 5
10
500/520
85
660/69
250
% Icu
Ics=100
cat A
50/60Hz
O OFF
947-2
IEC
EN 60947-2
BS CEI
UTE
D
250
250
cat A TM Icu C
100%
Ics = 250A/40°
UNE
AS NEMA
VDE
VDE
UTE
947-2UNE NEMA
IEC
CEI
BS
5
6
Ir
7
x 250A
Ir
Im
x 250A
auto
manu
O
push
OFF
I
push
1
012
53
ON
-2
BS CEI
IEC947
VDE
UNE
2
NEMA
UTE
Im 10
.9
.8
8
7
x 250A
Ir
Compact NS
Masterpact
Æ5...8
Im
O
auto
manu
Masterpact
d
discharge
6
1
x 250A
Digipact Bus
O OFF
D
250
250
cat A TM Icu C
100%
Ics = 250A/40°
VDE
UTE
947-2UNE NEMA
IEC
CEI
BS
5
9
volets
shutters
Test
compactL
NS250 Uimp 8kV.
Ui 750V. Icu (kA)
150
Ue(V)
150
220/240
130
380/415
70
440
20
500
100
600/690
0
125/16
push
to
trip
Ir
volets
shutters
Test
push
Compact NS
OFF
I
push
1
ON
ModBUS Bus
Devices
Circuit breakers equipped with Micrologic control units may be connected to
either a Digipact or Modbus communication bus. The information made available
depends on the type of Micrologic control unit (S, A) and on the type of
communication bus (Digipact or Modbus).
Switch-disconnectors may be connected exclusively to the Digipact
communication bus.
Communication bus
Digipact bus
The Digipact bus is the internal bus of the low-voltage switchboard in which the
Digipact communicating devices are installed (with Digipact COM, PM150,
SC150, UA150, etc.). This bus must be equipped with a DC150 data concentrator
(see the Powerlogic System catalogue).
Addresses
Addressing is carried out by the DC150 data concentrator.
Number of devices
The maximum number of devices that may be connected to the Digipact bus is
calculated in terms of "communication points". These points correspond to the
amount of traffic the bus can handle. The total number of points for the various
devices connected to a single bus must not exceed 100.
If the required devices represent more than 100 points, add a second Digipact
internal bus.
Communicating device
DC150 data concentrator
Micrologic + Digipact COM
PM150
SC150
UA150
Number of points
4
4
4
4
4
Length of bus
The maximum recommended length for the Digipact internal bus is 200 meters.
Bus power source
Power is supplied by the DC150 data concentrator (24 V).
74
Modbus bus
The Modbus RS485 (JBus) system is an open bus on which communicating
Modbus devices (Compact with Modbus COM, PM300, Sepam, Vigilohm, etc.) are
installed. All types of PLCs and microcomputers may be connected to the bus.
Addresses
The software layer of the Modbus protocol can manage up to 255 addresses
(1 to 255).
The "device" communication module comprises three addresses linked to:
b circuit-breaker manager;
b measurement manager;
b protection manager.
The "chassis" communication module comprises one address linked to:
b the chassis manager.
The division of the system into four managers secures data exchange with the
supervision system and the circuit-breaker actuators.
The manager addresses are automatically derived from the circuit-breaker
address @xx entered via the Micrologic control unit (the default address is 47).
logic addresses
@xx
@xx + 50
@xx + 200
@xx + 100
Circuit-breaker manager
Chassis manager
Measurement managers
Protection manager
(1 to 47)
(51 to 97)
(201 to 247)
(101 to 147)
Number of devices
The maximum number of devices that may be connected to the Modbus bus
depends on the type of device (Compact with Modbus COM, PM300, Sepam,
Vigilohm, etc.), the baud rate (19200 is recommended), the volume of data
exchanged and the desired response time. The RS485 physical layer offers up to
32 connection points on the bus (1 master, 31 slaves).
A fixed device requires only one connection point (communication module on the
device).
A drawout device uses two connection points (communication modules on the
device and on the chassis).
The number must never exceed 31 fixed devices or 15 drawout devices.
Length of bus
The maximum recommended length for the Modbus bus is 1200 meters.
Bus power source
A 24 V DC power supply is required (less than 20% ripple, insulation class II).
Communication interface
The Modbus bus may be connected to the central processing device in any of
three manners:
b direct link to a PLC. The communication interface is not required if the PLC is
equipped with a Modbus port;
b direct link to a computer. The Modbus (RS485) / Serial port (RS232)
communication interface is required;
b connection to a TCP/IP (Ethernet) network. The Modbus (RS485) / TCP/IP
(Ethernet) communication interface is required.
Software
To make use of the information provided by the communicating devices, software
with a Modbus driver must be used.
Micrologic utilities
This is a set of Modbus drivers that may be used with a PC to:
b display the variables (I, U, P, E, etc.) with the RDU (Remote Display Utility)
b read/write the settings with the RSU (Remote Setting Utility)
b remotely control (ON / OFF) the device with the RCU (Remote Control Utility)
These utilities are available on request.
75
6.3. Caractéristiques
de la communication
Masterpact, Compact NS
dans le réseau de communication
System Manager Software (SMS)
SMS is a power management software for the control and monitoring of LV and
MV electrical installations.
The SMS family includes a number of products for all types of applications, from
standalone systems to networked power management of multiple buildings.
SMS can communicate with all intelligent devices of the electrical installation
including:
b Power Meter and Circuit Monitor products
b LV circuit breakers and switch-disconnectors
b Sepam units.
76
© 2001 Schneider Electric - All rights reserved
Schneider Electric Industries SA
5, rue Nadar
92506 Rueil Malmaison
Cedex France
As standards and design change from time to time, always ask for confirmation of the
information given in this publication.
This document was printed on ecological paper.
Tel : +33 (0)1 41 29 82 00
Fax : +33 (0)1 47 51 80 20
http://www.schneiderelectric.com
DBTP172GUI/EN
Published by: Schneider Electric
Design and layout by: AMEG
Printed by:
11/2001