Medium Voltage
Distribution
GM6
MV Gas Insulated Switchgear
up to 36 kV
GM6
General presentation
Protection and control
of electrical networks
For over 30 years, Schneider has been providing Medium Voltage electrical
network protection, monitoring and control solutions in the public distribution,
industry and building sectors.
GM6 is a range of medium voltage equipment included in an offer that covers all
the functions required for network operation.
Public distribution networks
Network telecontrol (SCADA & DMS)
Milenium
Main functions:
t supervisory control and data acquisition,
t network restoration,
t wallboard replacement,
t geographic and schematic views,
t switching schedules,
t safety, checks and documentation,
t outage statistics,
t management of maintenance operations,
t management of construction programs.
HV/MV substation control
Talus
Main functions:
t remote control,
t HV and MV protection integration,
t data and alarm logging,
t centralized local control.
Industrial and building networks
Protection, monitoring and control
Isis - Powerlogic SMS
Sepam - Circuit Monitor - Power Meter.
Main functions:
t installation display,
t real time access to protection and control units,
t alarm management,
t data analysis,
t electricity consumption management,
t power availability and quality,
t protection functions,
t web technology.
2
Schneider Electric
GM6
GM6 offer
Three levels of components are available to protect, monitor and control the
medium voltage switchboard:
t A control and monitoring system interfaceable with a higher level system.
t
Sepam: protection and control unit for each switchgear unit (or cubicle).
GM6 units: medium voltage equipment comprising cubicles with breaking
devices, sensors, medium voltage connections and low voltage auxiliaries.
t
Pre-engineered and adaptable solutions
The three levels of components may be provided to make up:
t global solutions from the control centre to the MV switchgear,
t partial solutions which include 1, 2 or 3 levels of components to fit into projects for
new substations and retrofitting, extending and revamping existing installations.
Services
Equipment design, installation and maintenance.
Personnel training.
t Electrical network availability studies.
t 5-year extended warranty.
t
t
Schneider Electric
3
General presentation
Main characteristics
of MV equipment
GM6
INCOMER
BUS COUPLER
FEEDER 630 A
GM6 is indoor, metalclad switchgear designed for the MV section of HV/MV
and MV/MV substations.
GM6 is an important step forward from the point of view of personnel safety,
operational reliability and reduction in the overall dimensions of equipment.
GM6 units comply with the ENEL (Italian National Electricity Board), International
(IEC) and European standards.
GM6 range enables alla substation arrangements to be satisfied for system up to
40,5kV.
GM6’s design and functions take into account the three main categories of users
requirements.
t Investment Optimization and Profitability.
t Service continuity.
t Safety.
Investment Optimization and Profitability
These are achieved through GM6 capability to meet all users requirements in the
most cost-effective way possible.
With GM6, the user benefits from:
t the most compact equipment ever built in the medium voltage field, providing
users with a high degree of space savings when building or replacing a HV/MV or
MV/MV substation,
t pre-engineered solutions built upon the group’s worldwide experience and
collaboration with consultants and contractors, providing users with considerable
time savings when specifying needs,
t the shortest delivery and installation time possible, providing users with fast
commissioning and quick return on investment,
t a complete range of remote protection, control and monitoring functions when
requested by users who want to set up a supervision system in order to optimize
their energy supply.
Service continuity
Service continuity is achieved by means of GM6, which is a highly reliable
equipment offering with all the required functions to provide users with maximum
energy availability and quality.
With GM6, the user benefits from:
t adoption of long proven technical solution; for instance, aluminium castings for
the gas-filled compartment enclosures have been used for many years in MAGRINI
GALILEO gas-insulated high voltage equipment,
t quality organization in accordance with the ISO 9001 (EN29001) issued from
CSQ, the official certification body in the electric field in Italy,
t fully factory-tested equipment with type test reports (required by IEC standards
and ENEL specifications) available for each performance and type of cubicle,
t negligible maintenance requirements, confined to simple periodical checks and
possible monitoring of all electrical data affecting the working condition of
equipment,
t equipment that cannot be affected by humid, dusty, corrosive or polluted
operating environments since all live parts are contained in SF6 filled and sealed
enclosures,
t a supervision offer open to all specifications regarding substation management
and enabling users to control and follow up their energy supply.
Safety
Maximum safety is achieved through GM6 design and functions.
With GM6, the user benefits from:
t a very comprehensive set of mechanical and electrical interlocks preventing
operator errors and compliant with the user’s security protocol,
t internal arc withstand of all the functional units, validated in accordance
with IEC 60298, appendix AA, criteria 1 to 6, class A accessibility,
t operations with reliable and clear signalling devices and direct visibility of the
disconnecting contacts,
t high ratio between maximum withstand pressure for the gas-filled compartments
and normal filling pressure,
t pressure relief devices for exausting accidental excess internal pressure in order
to safeguard the operator,
t earthing switch on the cable side provided with making capacity,
t cable plug-in terminations housed in earthed metal shields, connectors to DIN
47637 standards,
t a temperature compensated pressure gauge (with alarm and signal contacts)
complete with a dial which is adjusted according to the elevation above sea level,
t voltage indicating devices located close to operating shaft of the earthing switch
on the cable side.
4
Schneider Electric
GM6
General characteristics
The values below are given for normal operating conditions as defined
in IEC 60298 and 60694.
rated voltage (kV)
rated insulation level
power-frequency withstand voltage (kV) rms
lightning impulse withstand voltage (kV) imp
rated normal current
busbar (A)
functional units (A)
short time withstand current (kA/3 sec) (2)
short circuit breaking current (kA)
internal arc withstand (kA/1 sec)
standard degrees of protection (3)
SF6 filled compartment
enclosure
internal partitions
24
36(6)
50
125
70
170
1250
2500
4000(7)
630
1250
2500
4000(1)
25
31.5
25
31.5
25(5)
1250
2500
4000(7)
630
1250
2500
4000(1)
25
31.5
25
31.5
25(5)
IP65
IP3X
IP2XC
IP65
IP3X
IP2XC
Normal operating conditions, according to IEC 60694 for indoor switchgear (4)
t Ambient air temperature:
y less than or equal to 40 °C,
y less than or equal to 35 °C on average over a 24-hour period,
y greater than or equal to -5 °C.
(1)
two units in parallel, please consult us.
the short-circuit making current is equal to 2.5 times the short time current.
standard degree of protection, for other values, please consult us.
(4)
for different conditions, please consult us.
(5)
31.5kA x 0.5 sec.
(6)
for 40,5 kV rated voltage, please consult us.
(7)
please, consult us.
(2)
(3)
Standards
GM6 units comply with the following standards:
t IEC 298-694
t ENEL (Italian National Eletricity Board) DY 0072
t Italian Work Safety Regulations
t U.K. Electrical Association approvat.
All switches, devices and components included in the switchgear conform to the
relevant IEC Standards.
Schneider Electric
5
GM6
Functional units
Description
GM6 switchgear is made up of interconnected functional units, available as singlebusbar or double-busbar system. Each functional unit contains all the elements
needed to perform its function:
t a gas insulated, metalclad cubicle, for indoor use,
t a circuit breaker using SF6 as a breaking medium, sealed for life,
t a digital protection and control system.
Power connections are made between functional units by a busbar set located
inside a SF6 compartment. Steady electrical continuity of all metal frames is
ensured by connection of each functional unit’s earthing busbar to the switchgear’s
main earthing circuit.
Low voltage compartments, for protection relay (front) and auxiliary
relay-terminal board (rear) are provided.
Cubicle
The cubicle is an earthed, metallic enclosure, gas insulated switchgear that
complies with the requirements of the IEC 60298 standard.
The cubicle comprises four electrically independent compartments.
The busbar compartment is separate and independent from the circuit breaker
compartment, so that the circuit breaker can be replaced if necessary while
the busbars are energized. An inspection window enables a visual check of the
position of the busbar disconnector blades. The compartment using SF6 as
isolating medium, is situated in the top of the unit and it contains:
t the main busbars,
t the three-pole, two way busbar disconnector.
The circuit breaker compartment is composed of an alluminium housing filled
with SF6 and containing the circuit breaker poles.
An inspection window enables a visual check of the position of the line isolator and
earthing switch.
The compartment is located in the central part of the cubicle and it contains:
t the disconnectable circuit breaker,
t the three-pole, two way line disconnector (only single busbar system),
t the earthing switch,
t the bushing for receiving plug-in cable terminations.
The MV connection compartment is situated in the bottom of the cubicle and it
contains:
t the cable connection,
t the current transformer,
t the voltage transformer.
The Low Voltage compartments are separated from the Medium Voltage section;
the first is located in the top of the unit and it contains protection and control
system, while the other are located on the back and contains the low voltage
auxiliaries. Three basic cubicle lay-out are offered:
t incoming or outgoing feeder
AD1/AD2,
t bus section
CL1/CL2 and double busbar system,
t the busbar metering
TT1.
Disconnectable circuit breaker
The circuit breaker SF1-G is designed in accordance with IEC 60056 standard and
it complies with the definition of «pressure sealed systems» given in IEC 60056
standard, appendix EE.
It is of the puffer type and uses the SF6 gas as a breaking and isolating medium.
The circuit breaker is maintenance free for life. In case of necessity it can be
replaced in short time because the main connections are made by sliding contacts.
Protection and control system
It includes:
t Sepam protection and monitoring unit
t current transformers
t voltage transformers
6
Schneider Electric
GM6
AD type functional unit (incomer and feeder)
single busbar system
8
1
2
12
1
SF6 busbar compartment
2
busbar disconnector
3
3
SF6 circuit breaker
compartment
7
4
cable compartment
5
current transformer
6
voltage transformer
11
7
SF6 circuit breaker
9
8
LV cubicles
9
MV plug-in connectors
O
I
13
3
5
5
3
O
3
5
5
3
4
6
6
44
I
8
10
4
10 line disconnector
5
11 earthing switch
6
12 inspection window
13 sliding contacts
AD type functional unit (incomer and feeder)
double busbar system
8
1
2
3
11
7
1
SF6 busbar compartment
2
busbar disconnector
3
3
5
5
12
3
O
3
5
5
3
4
6
6
44
I
8
10
9
SF6 circuit breaker
compartment
O
I
4
cable compartment
5
current transformer
6
voltage transformer
7
SF6 circuit breaker
8
LV cubicles
9
MV plug-in connectors
O
I
4
5
6
10 earthing switch
11 inspection window
12 sliding contacts
Schneider Electric
7
Functional units
Choice Single Busbar System
GM6
The GM6 range is composed of 7 functional units. The chart below may be used
to link up needs and functional units, and it gives information on the general
composition of each unit.
How to select: if the user wishes to supply power to a transformer, the solution
is a Transformer Feeder.
The matching functional unit is therefore a TF, comprising an AD1 cubicle
equipped with a disconnector switch, circuit breaker and a type T Sepam.
incomer
line
busbar
disconnector
feeder
transformer
busbar
disconnector
circuit breaker
circuit breaker
line disconnector
line disconnector
earthing switch
earthing switch
LI
TI
AD1 - AD2
AD1 - AD2
Sepam S
Sepam T
synoptic
synoptic
current transformer / voltage transformer
bus section
busbar metering
meter / earth
line
busbar
disconnector
transformer
busbar
disconnector
capacitor
busbar
disconnector
switchboard
circuit breaker
line disconnector
earthing switch
LF
AD1 - AD2
Sepam S
synoptic
circuit breaker
line disconnector
earthing switch
TF
AD1 - AD2
Sepam T
synoptic
circuit breaker
line disconnector
earthing switch
CF
AD1 - AD2
Sepam C
synoptic
circuit breaker
line disconnector
B-S
CL1 - CL2
Sepam B
synoptic
current transformer
(only CL2)
line disconnector
earthing switch
BB-S
TT1
Sepam B
synoptic
voltage transformer
lightning
arresters
key locks
Incomer
LI, TI with AD1/AD2
8
key locks
Feeder
LF, TF, CF with AD1/AD2
Switchboard bus section
BS with CL1/CL2
Busbar metering
BB-S with TT1
Schneider Electric
Functional units
Choice Double Busbar System
GM6
The GM6 range is composed of 8 functional units. The chart below may be used
to link up needs and functional units, and it gives information on the general
composition of each unit.
How to select: if the user wishes to supply power to a transformer, the solution
is a Transformer Feeder.
The matching functional unit is therefore a TF, comprising an AD1 cubicle
equipped with a disconnector switch, circuit breaker and a type T Sepam.
incomer
line
busbar
disconnector
feeder
transformer
busbar
disconnector
line
busbar
disconnector
circuit breaker
circuit breaker
circuit breaker
earthing switch
earthing switch
earthing switch
LI
TI
LF
AD1 - AD2
AD1 - AD2
AD1 - AD2
Sepam S
Sepam T
Sepam S
synoptic
synoptic
synoptic
current transformer / voltage transformer
transformer
busbar
disconnector
capacitor
busbar
disconnector
circuit breaker
earthing switch
TF
AD1 - AD2
Sepam T
synoptic
circuit breaker
earthing switch
CF
AD1 - AD2
Sepam C
synoptic
bus
section
switchboard
busbar
disconnector
bus
coupler
switchboard
busbar
disconnector
circuit breaker
circuit breaker
B-S
CL1 - CL2(1)
Sepam B
synoptic
current
transformer
(only CL2)
B-C
CT1-CT2
Sepam B
synoptic
current
transformer
(only CT2)
busbar
metering
meter / earth
busbar
disconnector
earthing switch
BB-S
TT1(1)
Sepam B
synoptic
voltage
transformer
lightning
arresters
key locks
(1)
key locks
use one unit for each busbar
Incomer
LI, TI with AD1/AD2
Busbar coupler
B-C with CT1/CT2
Schneider Electric
Feeder
LF, TF, CF with AD1/AD2
Switchboard bus section
BS with CL1/CL2
Busbar metering
BB-S with TT1
9
Functional units
Description
GM6
Functional unit/cubicle correspondence chart
The chart below summarizes the electrical characteristics of each of the GM6
functional units.
The type of cubicle used for the function varies according to the characteristics.
The name of the cubicle (AD1, CL2,...) is the name which appears on the GM6 test
certificates.
How to read the chart:
to create a “line incomer” function, an LI functional unit is chosen.
The incomer characteristics are:
t Un = 24kV,
t Isc = 25kA,
t In = 2500A.
The cubicle used for this function is an AD2.
function
line incomer
transformer incomer
switchboard coupler
24 kV
LI
TI
SS
kA
31,5
25
1250
LF
TF
CF
1250
A
2500
A
2500
A
2500
A
2500
A*
CL2
CL2
2500
A
kA
31,5
25
1250
kA
31,5
25
CT2
CT2
1250
BB-S
A
kA
31,5
25
CT1
busbar metering
2500
kA
31,5
25
1250
B-C
2500
AD2
AD2
CL1
bus coupler**
1250
A
kA
31,5
25
1250
B-S
2500
kA
31,5
25
AD1
bus section
AD2
AD2
AD1
line feeder
transformer feeder
capacitor feeder
36 kV
kA
31,5
25
2500
A
kA
31,5
25
1250
kA
31,5
25
TT1
1250
TT1
2500
A*
1250
* busbar current
** only for double busbar system
10
Schneider Electric
GM6
Front views
Side views
Side views
Front views
AD1
AD1
AD2
AD2
If CTs are required, select CL2.
CL1
CL1 bus coupler
CL1 bus section
CL2
CL2 bus coupler
CL2 bus riser
TT1
TT1
Dimensions (mm) and approximate weights (kg)
by type of cubicle
(*) without-with VTs
(**) without CTs- min weight with 1 CT set- max weight with
2 CTs sets
(***) without-with CTs.
Schneider Electric
width (mm)
height (mm)
depth (mm)
weight (kg)
AD1
500
AD2
700
720-840*
720-770-820**
1800-2200*
1080-1260*
1080-1130-1310**
CL1
1075
2560
CL2
1475
1700
1900-2000***
TT1
500
1800
700
11
Functional units
Description
GM6
Front views
Side views
Side views
Front views
AD1
AD1
AD2
AD2
If CTs are required, select CL2.
CL1-F
CL1-F bus section
CL1-F bus riser
If CTs are required, select CL2.
CL1-R
CL1-R bus section
CL1-R bus riser
CL2-F bus section
CL2-F bus riser
4
CL2-F
12
Schneider Electric
GM6
Front views
Side views
Side views
CL2-R
CL2-R bus section
CL2-R bus riser
Front views
If CTs are
required,
select CT2
with current
transformers.
CT1
CT1 bus coupler
CT2 bus coupler
CT2 with current
transformers
bus coupler
bus riser
TT1-F
TT1-F
TT1-R
CT2
TT1-R
Dimensions (mm) and approximate weights (kg)
by type of cubicle
(*) without-with VTs
(**) without CTs- min weight with 1 CT set- max weight
with 2 CTs sets
(***) without-with CTs
(****) dimensions also valid for CT2 with CTs.
Schneider Electric
width (mm)
height (mm)
depth (mm)
weight (kg)
AD1
500
AD2
700
875-995*
875-925-975**
1800-2200*
1295-1475*
1295-1345-1525**
CL1
1075
2560
CL2 (****)
1475
1855
2115-2215***
TT1
500
1800
855
13
GM6
Protection monitoring and control
Switchboard monitoring and control
GM6 supervision system
GM6 can be provided with a user’s customized supervision system designed to
control and monitor GM6 switchboards.
The use of a supervision system is a key factor in the improvement of the quality
of service:
t efficiency in daily use and operations thanks to a user friendly user interface,
t continuity of service by fast intervention provided by remote control of the GM6,
t understanding and analysis of events and loads.
User-friendly and dependable operator interface
The operator interface of a GM6 supervision system is designed to be used
by electricians.
The ergonomics is intuitive, making the system easy to understand and use.
Architecture
The user terminal consists of a compatible personal computer.
It is directly connected to the Sepam protection units via a standard communication
bus.
The control station can easily be connected to a higher level monitoring
and control system.
Basic functions
The main functions are:
t installation display by chained mimic diagrams
(animated single line diagram, device position, energized parts, current faults…),
t continuity of service by fast intervention provided by remote control of the GM6,
t understanding and analysis of events and loads.
14
Schneider Electric
GM6
GM6 switchboard: protection monitoring and control unit
Sepam is a range of digital monitoring protection and control units.
Sepam is at the centre of protection, monitoring and control system for GM6
functional units: all the necessary protection, metering, control, monitoring and
signalling functions are carried out by Sepam.
Sepam has a range of units defined to provide an optimal solution for a each
application, and includes:
t Sepam S, sub-station incomer and feeder
t Sepam B, bus sectioning
t Sepam T, transformer feeder
t Sepam M, motor feeder
t Sepam C, capacitor feeder
t Sepam G, generator feeder
The Sepam range hinges around 2 functional and hardware bases:
t Sepam 2000, focused on performance, covers all GM6 functional applications
+
t Sepam 1000 , simple and modular, offers an optimezed solution for most
common applications.
Sepam advantages
Sepam, a digital multi-functional protection unit, provides you with the following
advantages:
t simple to use for better dayly efficiency: use-machine interface (UMI) which
is ergonomic and which provides comprehensive and clear information to operators
t simple to incorporate: flexibility and user friendliness of parameter setting
software, simplified tests
t money saving:
v integrating all functions required in one single, ready to use product
v upgradable solution, to spread the cost of investment over time
t centralized GM6 switchboard management:
v Sepam is easily integrated into all network control systems, due to its Modbus
communication interface
v all data required for installation monitoring and control are accessible through
the Modbus communication
t better network knowledge through the oscillo-disturbance recording function
and measurement of the imbalance ratio, motor operation parameters, etc.:
t improving continuity of service
v through effective preventive equipment maintenance using switchgear diagnosis
functions: time and number of operations, sum of breaking currents A2, etc.
v through clear and comprehensive information, both locally and remotely, reducing
the time needed to act in the event of a fault.
to remote
control centre
I on
A
V/Hz
W/ϕ
Wh
O off
clear
alarm
trip
I on
reset
A
MERLIN GERIN
I on
A
V/Hz
W/ϕ
Wh
O off
clear
alarm
MERLIN GERIN
Schneider Electric
W/ϕ
Wh
O off
clear
alarm
trip
reset
MERLIN GERIN
trip
reset
V/Hz
I on
A
V/Hz
W/ϕ
Wh
O off
clear
alarm
trip
reset
MERLIN GERIN
I on
A
V/Hz
W/ϕ
Wh
O off
clear
alarm
trip
reset
MERLIN GERIN
I on
A
V/Hz
W/ϕ
Wh
O off
clear
alarm
trip
reset
MERLIN GERIN
15
GM6
Protection monitoring and control
Functional unit protection
Protection and control solution
Each GM6 functional unit is equipped with a protection and control solution suitable
for the function to be performed.
The solution comprises :
(1)
t a Sepam Protection and Control unit
suited to the needs,
t toroidal current transformers,
t voltage transformers,
t low voltage auxiliaries: test blocks, auxiliary contacts, terminal blocks ...
t low voltage outlets for connection to the switching device.
(1)
or any other combination of relays, automation devices, measurements and metering
apparatus.
Sepam 2000, for all applications
The Sepam 2000 range of digital protection, monitoring and control units provides
a comprehensive solution for all applications:
sub-station, busbar, transformer and motor, as well as generators and capacitors.
Different types of Sepam 2000 are proposed for each type of equipment to be
protected. For example, there are 30 different types of Sepam 2000 dedicated
to protection, monitoring and control of transformers.
Each Sepam 2000 is an optimized solution, designed to provide an exact response
to the actual requirements of a functional application, including all the required
functions ready to use.
Focused on performance, Sepam 2000 includes the following functions:
t metering functions: measurement of current and voltage, measurement of power
and active and reactive energy, etc.
t protection functions: directional phase and earthing protection, differential
transformer or machine protection, etc.
t monitoring and control functions: in its function as a programmable logical
controller, Sepam 2000 is pre-programmed to carry out standard monitoring and
control functions, and can be re programmed to handle any specific automatic
control function!
Sepam 1000+, for the most common applications
Sepam 1000+ is a new range of protection, monitoring and control units which are
both cost-effective and high performance.
Sepam 1000+, a simple solution:
t a lean catalogue adapted to the following typical applications: line incomers
and feeders, transformers, motors and busbars,
t ready to use, with integrated settable breaking device control,
t ergonomic user-machine interface (UMI) for intuitive use
Sepam 1000+, a modular solution.
To adapt to increasing numbers of applications, and to allow the installation to be
upgraded at a later date:
t choice between 2 user-machine interfaces (UMI): a basic UMI, or an advanced
UMI with graphic LCD screen and keypad. The advanced UMI can be remotely
located and its screens can be customized in all languages.
t functional enhancement with optional additional modules: on / off input / output,
Modbus communication network connection interface, acquisition module for 8
temperature probes or low level analogue output module (4-20 mA).
For detailed information, see catalogues (Sepam Encyclopædia on CD ROM).
16
Schneider Electric
Protection monitoring and control
Current and voltage transformers
In the protection system, the functional units are fitted with transformers designed
to supply the measurements and/or protection circuits:
t current transformers,
t voltage transformers,
The active parts are totally encapsulated in an integral epoxy resin molding
which serves a dual function:
t it ensures electrical insulation,
t it guarantees the assembly an excellent mechanical resistance.
Current transformers
AD1 and AD2 units
ARC, AOL, AOPC and ARL (see table on page 24) type toroidal-core current
transformers, located in the cable compartment. The toroidal core accommodates
the secondary windings, the cable is the primary winding.
The transformers have primary current values of 50A to 2500A and secondary
current 1A or 5A.
AOPC type
CL2 unit
ARO type toroidal-core current transformers, located in the bus-section unit.
The transformers have primary current values of 50A to 2500A and secondary
current 1A or 5A.
Schneider has a standardized list of CTs that are appropriate for use with digital
protections to simplify the determination of accuracy characteristics.
This list is available on request.
ARO type
Voltage transformer
TT1 unit
VRT type metal shielded voltage transformers, located in the cable compartment.
They have one insulated MV end with plug-in connector, for connection between
neutral and phase conductors in 3-phase systems.
The cores and windings are overcast in epoxy resin, providing electrical insulation.
The external surface is metal shielded.
VRT type
Schneider Electric
17
Apparatus
SF1-G circuit breaker up to 36 kV
GM6
SF1-G circuit breaker
The SF1-G circuit breakers are of the “puffer“ type and use SF6 gas
as a breaking and insulating medium.
They are composed of three poles mounted on a base which supports
the operating mechanism. Acording to IEC 56 App. EE (1987), the circuit breaker
is defined as a sealed pressure system, that is an assembly for which no further
gas processing is required during its expected operating life.
t The fundamental feature of the circuit breaker- essential for the very concept
of a fully gas insulated switchgear- is its very high dependability which means:
v high reliability,
v long mechanical life: the circuit breakers are designed for 10000 mechanical
operations with no need to replace parts with only ordinary maintenance of the
operating mechanism,
v long electrical life: the capacity of breaking load and short circuit current is much
higher than it is normally required in 30years of operational life. The circuit breakers
comply for the electrical endurance life whit Table IV of the ENEL (Italian National
Electricity Board) specification DY 1702 and IEC 56.
v no need for any maintenance on the active parts,
v manufactured under a fully quality assurance program.
t
Puffer type: operating principle
fig. 1
fig. 2
fig. 3
fig. 4
18
The main contacts and arcing contacts are initially closed (fig 1).
Precompression (fig 2)
When the contacts begin to open, the piston slightly compresses the SF6 gas
in the pressure chamber.
Arcing period (fig 3)
The arc strikes between the arcing contacts. The piston continues its downward
movement.
A small quantity of gas, directed by the insulating nozzle, is injected across the arc.
For the breaking of low currents, the arc is cooled by forced convection.
However, for high currents, thermal expansion causes the hot gases to move
toward the colder parts of the pole unit.
The distance between the two arcing contacts becomes sufficient for the current
to be broken when it reaches the zero point, due to the dielectric properties of SF6.
Sweeping overstroke (fig 4)
The moving parts finish their movement and the injection of cold gas continues until
the contacts are completely open.
Schneider Electric
GM6
Characteristics of circuit breakers
in GM6 GIS
electrical characteristics
rated voltage
insulation level
short circuit breaking current
kV, 50/60 Hz
kV, rms 50 Hz - 1 mn
kV, 1.2/50 µs impulse
A
630
1250
2500
4000
kA, rms
short circuit current
kA, peak
short-time withstand current
kA, rms 3s
capacitor breaking current
for rated current
rated operating sequence
A
rated normal current
approximate operating time
=630
>630
O-0.3s-CO-30s-CO
O-0.3s-CO-3min-CO
ms
opening
breaking
closing
SF1-G
24
50
125
36
70
170
t
t
t
t
t
t
t*
t*
25
31,5
63
80
25
31,5
530
875
25
31,5
63
80
25
31,5
530
630
t
t
t
t
40-60
50-70
50-70
40-60
50-70
50-70
* 2 circuit breakers in parallel.
Circuit breaker
The circuit breakers in the SF1-G range use SF6 for insulation and current
breaking. They are composed of three poles mounted on a base which supports
the operating mechanism. Acording to IEC 56 App. EE (1987), the circuit breaker
is defined as a sealed pressure system, that is an assembly for which no further
gas processing is required during its expected operating life.
t The fundamental feature of the circuit breaker- essential for the very concept
of a fully gas insulated switchgear- is its extremaly high dependability which means:
v high reliability
v long mechanical life: the circuit breakers are designed for 10000 mechanical
operation with no need to raplace parts with only ordinary maintenance of the
operating mechanism
v long electrical life: the capacity of breaking load and short circuit current is much
higher than it is normally required in 30years of operational life. by way of example,
the circuit breakers are guaranteed for the elctrical duration defined by Table IV
of the ENEL (Italian National Electricity Board) specification DY 1702.
v no need for any maintenance on the active parts
v manufactured under a fully quality assurance program.
main switching features
v low overvoltages when breaking small inductive currents
v suitable for rapid autoreclosing duty
v suitable for switching capacitor banks
standards
the indicated features are referred to the following standards and specifications:
IEC 56 and 694 International Standards
ENEL DY 1701-707 specifications
operating times
t opening time (interval of time between the instant of energizing the opening
release and the instant when the arcing contacts have separated in all poles):
40 to 60 ms
t break time (interval of time between the instant of energizing the opening release
and the instant when the arc extinguishes in all poles): 50 to 70 ms
t closing time (interval of time between energizing the closing circuit and the
instant when the contacts touch in all poles): 50 to 70 ms
operating sequence
Consult our technical department for other operating sequences.
Schneider Electric
19
Apparatus
GMh operating mechanism
GM6
GMh operating mechanism
SF1-G range circuit breakers are actuated by a GMh operating mechanism that
ensures switching device closing and opening speed that is independent of the
operator.
Circuit breakers equipped with a GMh electrical operating mechanism can perform
remote control functions and implement reclosing cycles.
A GMh electrical operating mechanism includes:
t a spring system that stores the energy needed to close and open the breaker,
t a manual spring charging system,
t an electrical motor spring charging device that automatically recharges
the mechanism as soon as the contacts close (time i 5 s),
t two mechanical push-buttons on the front panel for opening and closing,
t an electrical closing system including:
v a closing release for remote control and an anti-pumping relay.
t an electrical “opening” release system featuring one or more releases
of the following types:
v shunt,
v undervoltage,
v low power-consuming mitop*,
t operation counter,
t an optional “operating mechanism charged“ indication contact,
t an end-of-charging contact,
t a black and white mechanical “open-closed” position indicator,
t a multi-pin connector for isolating auxiliary circuits in the “disconnected“ position.
Auxiliary contacts
The GMh operating mechanism is equipped with a block of 15 auxiliary contacts,
including:
t 1 changeover contact for the electrical operating mechanism,
t 1 changeover contact for indication,
t 1 changeover contact for the shunt release.
The number of available contacts depends on the composition of the operating
mechanism and the options chosen. In any case the minimum available contact are
7 (4NC - 3NO).
* mitop: current-operated release used as an option with the Sepam 100 LA protection relay.
rated current
breaking
capacity
AC
DC
10 A
10 A with 220V
(p.f. u 0.3)
1.5 A with 110 or 220V
(L/R i 0.01 s)
GMh operating mechanism characteristics
type of auxiliaries
supply
consumption
possible combinations
of auxiliaries
and quantities
spring
charging
motor
voltage
AC (V)
50 Hz
60 Hz
DC (V)
AC (VA)
DC (W)
=
or
or
or
or
or
or
or
closing
release
48 -110 - 220
120 - 240
24 - 48 - 60 - 110 - 125 - 220
500
100
500
70
+
+
t1
t1
t1
t1
t1
t1
t1
t1
t1
t1
t1
t1
t1
t1
t1
t1
opening release
shunt
single
double
100
70
+
t1
t1
200
140
+
1
t1
undervoltage
400/90**
100/10**
+
t
1
t
1
1
Mitop
7
t
t
t
1
t
t
1
t
1
1
** pick-up/hold consumption.
20
Schneider Electric
GM6
Apparatus
Auxiliary diagram
Auxiliary diagram
GMh circuit breaker operating mechanism
KN
M
M3
Mitop
Q
QF
SE
SM
M1-M2
Sm1
Sm2
Anti-pumping relay.
Spring charging motor.
“Operating mechanism charged” indication.
“Mitop” operating release (current-operated).
Circuit breaker.
Circuit breaker auxiliary contacts.
Latch check
Manual charging operation in progress.
End-of-charging contacts.
Closing push button (outside).
Opening push button for shunt trip release
(outside).
Sm3
Opening push button for undervoltage release
(outside).
Sn
Closing disable contact (outside).
SP1
Pressure-switch contact first level.
SP2
Pressure-switch contact second level.
YF
Closing release.
YM
Undervoltage opening release.
Y01-Y02 Shunt opening releases.
SC
Busbar to earth indication.
Schneider Electric
Sm1
Sm2
Sm3
Sn
SM
QF
SC
Q
SE
KN
Y01
YM
M
SP1
Y02
M3
M2
M1
Mitop
SP2
YF
21
GM6
Installation
Cable terminations
The switchgear is designed for the use of plug-in terminations according
to DIN 47637 specifications.
It is possible to connect up to four cables (1/3-core cable) for each phase with
a max. cable cross-section up to 630 mm2.
In order to simplify the assembly and cable-testing work, the height of the
connection point is more than 700 mm.
Type of cable terminations (only for reference):
rated
voltage
unit
rated
current
short
circuit
current
kV
12-24
12-24
12-24
12-36
12-36
12-36
A
630
630
1250
1250/1600
2000
2500
kA
25
25
25
31.5
31.5
31.5
max n° of cables
max n° of CT
per phase (1)
size 1
size 3
1
2
2
2
3
4
per phase
and type
2 x ARC2
2 x AOL2 (2)
2 x AOL2
2 x AOPC
2 x ARL4
2 x ARL5 (3)
An addictional bushing to DIN 47637 can be provided on request for connecting a voltage
transformer per phase.
(1)
cable cross section
t for size 1 terminations: from 25 to 240 mm2
t for size 3 terminations: from 150 to 630 mm2
(2)
type ARC2 with only 1 cable per phase
(3)
type ARL4 with 3 cables per phase
22
AD2
AD2
4 cables per phase
with ARL5 CT type
+ VT connection
3 cables per phase
with ARL4 CT type
AD2
AD1
2 cables per phase with
AOPC CT type
2 cables per phase
with AOL CT type
Schneider Electric
Installation
Example of layout
GM6
Line-up switchgear
4200
1800
800
(two supply cubicles and one bus section 36 kV 2500 A)
50
50
700
2 feeders
1250 A or 2500 A
500
700
incomer
1250A
with VT
1475
bus section
2500 A
busbar
transformer
500
busbar
transformer
700
incomer
2500A
with VT
700
700
2 feeders
1250 A or 2500 A
1600
700
500
7675
Civil engineering with utilities space
(1)
(2)
(3)
(4)
3200(5)
2700
(5)
up to 1200 mm if requested
distance needed to extract a functional unit from the switchboard without
moving the other units
minimum distance (mm)
minimum distance (mm), according to the cables bending radius
the switchboard where internal arc protection is required, please consult us.
For further details, please refer to the civil engineering manual.
1600(1)- 2000(2)
800(3)
800
1200 (4)
280
Schneider Electric
23
GM6
Environment
Preserving the environment
The Schneider recycling procedure for
SF6 based products is subject to rigorous
management, and allows each device to
be traced through to its final destruction.
The Schneider recycling procedure
Within the framework of the group’s environmental policy, Schneider services
has made an operational procedure available, enabling medium voltage switchgear
to be processed while eliminating any release of SF6 into the atmosphere.
To help you to protect the environment, and to take care of your storage or
dismantling concerns, Schneider services offers to recover any of your equipment
that is reaching the end of its service life.
The GM6 has been designed with environmental protection in mind:
c the insulating and conducting materials that are used are identified,
easy to separate, and recyclable,
c SF6 can be recovered at the end of its life, and reused after treatment.
24
Schneider Electric
Schneider Electric S.p.A.
LEES CA M 321 B E
Circonvallazione Est, 1
24040 Stezzano (BG)
Tel. (035) 4151111
Tfax (035) 4153200
As standards, specifications and designs change from time to
time, please ask for confirmation of the information given in this
publication.
1-0501-4A