VIP 300 protection relay
for Ringmaster
VIP 300 protection relay
Protection relay
Providing a wide range of
selectivity and quality of supply
The VIP 300 is a three phase overcurrent and earth fault
protection relay, providing protection for the network and
equipment. It is an integral part of the highly successful
Ringmaster range of secondary distribution switchgear.
The main function of the relay is to detect overcurrent
and earth faults within the network and to trip the circuit
breaker.
Self powered
reliability
The VIP 300
protection relay is a
self powered
microprocessor
based unit which
requires no external
DC power source or
batteries, making it
the ideal solution for
location in remote
areas or where
auxiliary supplies are
not available.
2
VIP 300 protection relay
Benefits
Flexibility
There are a wide range of settings
available. The IDMT (inverse definite
minimum time) characteristics can be
adjusted to grade the relay with other
devices. Fast power up ensures that when
switched on to a fault the power up time
is less than )30ms.
Testing
The VAP6 hand held test unit, is
available to provide a simple check of
the integrity of the relay and can also
perform trip tests. Circuit breaker “trip
inhibit” facility allows the relay to be
tested without tripping the circuit breaker
using the VAP6. Secondary injection can
be carried out using conventional test
equipment.
Ease of use
VIP 300 has improved operation and control,
with the relay settings being clearly
displayed on the front panel.
Manual reset flags show separate ‘tripped on
fault’ for either overcurrent or earth fault
conditions.
Reliability
The relay has a self monitoring device and
diagnostic routine which constantly checks
the operation of the relay automatically.
3
VIP 300 protection relay
Features
■ Pick-up current ranges:
RN2c, RE2c, CN2, CE2
overcurrent : 20A -200A
earth fault : 2A-160A.
CE6 and RN6c
overcurrent : 40A - 400A
earth fault : 4A to 320A.
overcurrent : 80A - 800A
earth fault : 8A to 640A.
■ Hardened electronics
Certified EMC performance to IEC 255
and EN 50061, EN50082.
■ Separate overcurrent and earth fault
trip indication.
■ Flashing LED’s indicate when the relay
pick-up setting has been exceeded
(creep test).
Protection application guide
Product
CE2, RN2c, RE2c
CE6, RN6c
Application
transformer
ring feeders
200 - 1600kVA
400 - 3800kVA
incomers
1900 - 12000kVA
Time Fuse Link
IDMT VIP 300
*Note: a protection coordination study may be necessary to verify the type of protection. Consult your local Merlin Gerin sales engineer if in doubt.
Protection selection guide
Primary current (A)
Equivalent transformer rating at 11kV
Units
Application protection
CE2
Transformer protection Time Fuse Link
CN2
IDMT - VIP 300
RN2c, RE2c
CE6
RN6c
4
Feeder protection
IDMT - VIP 300
10
200kVA
20
400kVA
80
1600kVA
100
1900kVA
125
2400kVA
200
3800kVA
630
12000kVA
VIP 300 protection relay
Protection relay
Ringmaster - the total solution
The Ringmaster range of switchgear comprises non-extensible and
extensible ring main units, extensible switches and circuit breakers
up to 630A for medium voltage systems up to 13.8kV.
RN2c - 200A non-extensible ring main unit incorporating 2 fault
make/load break switches and a tee-off circuit breaker (transformer
mounted or free standing).
RE2c - 200A extensible ring main unit incorporating 2 fault
make/load break switches and tee-off circuit breaker (transformer
mounted or free standing). Available early 2000.
RN6c - 630A non-extensible ring main unit for freestanding network
sectionalising.
CN2 - 200A non-extensible circuit breaker (transformer mounted or
free standing).
SN6 - 630A non-extensible switch (transformer mounted or free
standing).
CE2 - 200A extensible circuit breaker (switchboard mounted).
CE6 - 630A extensible circuit breaker (switchboard mounted).
SE6 - 630A extensible switch (switchboard mounted).
MU2 - 200A feeder metering unit (circuit connected, transformer
mounted or free standing).
Easergy - Telecontrol cabinets (up to four switch control, freestanding, wall or switchgear mounted).
For further details please refer to the Ringmaster range selection guide.
■
Time Fuse Link
In addition to the VIP 300 relay, Ringmaster
is also available with Time Fuse Link
protection as a low cost option for
transformers. Further details are given in the
Ringmaster range selection guide.
5
6
VIP 300 protection relay
Technical specification
Content
Page
Use and settings
Relay front panel
8
Curve selection
9
Operating ranges
Selection principle
10
Applications
Required setting
information
11
Setting examples
12
Ex. 1 - Ring main unit
protecting an 11kV,
1MVA transformer
13 - 14
Ex. 2 - 200A circuit breaker
protecting an 11kV,
2MVA transformer
15
Ex. 3 - 630A circuit breaker
protecting a radial feeder
of 4MVA at 11kV
16 - 17
Ex. 4 - 630A circuit breaker
protecting a radial feeder
of 8MVA at 11kV
18
Technical
characteristics
19
IDMT & DT tripping
curves
Standard inverse
20
Very inverse
21
Extremely inverse
22
Definite time
23
7
VIP 300 protection relay
Relay front panel
1
2 3
4
5
C B
phase
overcurrent
7
8
6
10
A
I>
sensors:
200/1 4509996A0
VIP300LH range: x2
EI
1.2
DT
(s)
curve selection
15
6
4
2.7
1
12
9
2.4
1.5
off
VIP 300
2.1
1.8
SI
RI
42 48 56
36
64
30
72
24
80
20 100 90
(A)
I>>
DT only
VI
I>
trip
9
20
3
(x Is) 3
(x Is) off
0.2
0.15 0.2
0.3
0.1
0.07
x10
0.4
0.05
not time
multiplier
x1
Is
0.6
0.05
0.9
0.03
0.6
t>
0.4
0.1
warning
(s)
t>>
see table
1.5
VIP 300
Settings
Equivalent Time
Multiplier
t>
to>
SI
VI
EI
0.05
0.07
0.1
0.15
0.2
0.3
0.4
0.05
0.6
0.07
0.1
0.15
0.2
0.3
0.4
0.6
x1
x1
x1
x1
x1
x1
x1
x10
x1
x10
x10
x10
x10
x10
x10
x10
0.02
0.02
0.03
0.05
0.07
0.10
0.13
0.17
0.20
0.24
0.34
0.50
0.67
1.01
1.35
2.02
0.03
0.05
0.07
0.10
0.13
0.20
0.27
0.33
0.40
0.47
0.67
1.00
1.33
2.00
2.67
4.00
0.06
0.09
0.12
0.19
0.25
0.37
0.50
0.62
0.74
0.87
1.24
1.86
2.48
3.71
4.95
7.43
reset
Io>
minimum operating
phase current: 20A
2.1
1.8
SI
off
DT
1.2
(s)
15
6
4
2.7
1
12
9
2.4
1.5
RI
trip
Io>>
DT only
EI
VI
20
3
3
(x Ios) off
curve selection
16 24 32
12
40
8
50
4
60
2 80 70
(A)
Io>
earth fault
0.15 0.2
0.2
0.3
0.1
0.07
0.4
0.05 (s)
x1
0.6
to>
Ios
not time
multiplier
0.4
0.6
0.1
warning
x10
0.05
0.03
to>>
see table
0.9
(s)
1.5
VAP6 test plug
D
11 12
13
14
E
15
17
18
16
19
20
Phase overcurrent setting
Earth fault setting
Other functions
1.
Phase setting area
(upper half of relay front panel).
11. Earth fault setting area
(lower half of relay front panel).
A. Current setting scale label.
2.
Red LED phase overcurrent
pick-up indicator.
12. Red LED earth fault pick-up
indicator.
3.
Phase overcurrent trip indicator.
13. Earth fault trip indicator.
D. Minimum operating current.
4.
Phase overcurrent setting Is.
14. Earth fault setting current Ios.
E. VAP6 test plug socket.
5.
Choice of low set curve type I>.
15. Choice of low set curve type Io>.
6.
Low set pick-up (DT only) I>.
16. Low set pick-up (DT only) Io>.
7.
Low set time delay t>. (@10Is)
17. Low set time delay to>. (@10Ios)
8.
Multiplying factor (low set).
18. Multiplying factor (low set).
9.
High set pick-up I>>.
19. High set pick-up Io>>.
10. High set time delay t>>.
8
20. High set time delay to>>.
B. Current transformer and
range information.
C. Indicator reset button.
VIP 300 protection relay
Curve selection
Phase overcurrent setting:
IDMT curve selection
t
The numbers indicated below are those
of the setting switches (refer to the
diagram of the front panel on page 8)
The letters indicate the curve
characteristic as shown opposite.
G
SI, VI, EI RI
Phase overcurrent setting:
F ■ Setting current Is (4)
G ■ Type of low set I> curve (5)
IDMT: SI, VI, EI, RI.
Definite time: DT
t>
H ■ DT low set pick-up I> (6)
This setting is only active for the
low set DT curve selection (as
shown). If IDMT curves are
selected this switch is disabled,
as SI,VI, EI, low set pick-up is
fixed at 1.2 Is.
J
K
t>>
J ■ Low set time delay t> (7)
and multiplier (8)
L
Is
F
1.2 Is
10 Is
K ■ High set I>>(9)
L ■ High set time delay t>>(10)
Earth fault setting:
I>>
The principle is the same as for phase
protection.
Set:
F ■ Setting current Ios (14)
DT curve selection
G ■ Type of low setting Io> curve (15)
t
IDMT: SI, VI, EI, RI
Definite time: DT
H
I>
t>
DT
H ■ DT low set pick-up Io> (16)
This setting is only active for the
low set DT curve selection (as
shown). If IDMT curves are
selected this switch is disabled,
as SI, VI, EI low set pick-up is
fixed at 1.2 Is.
G
J
J ■ Low set time delay to> (17)
and multiplier (18)
K ■ High set Io>>(19)
L ■ High set time delay to>>(20)
K
Operation:
t>>
Is
L
1.2 Is
I>
The high and low set elements
operate separately. The tripping order
results from the “logical OR” between
the two settings.
I>>
F
9
VIP 300 protection relay
Choice of operating ranges
Selection principle
The operating range for the VIP 300 is dependent on the current transformer
(also referred to as sensor) used, which is determined by the Ringmaster panel type
chosen from the selection guide. The relay itself can then be set to either the x2 or
x4 range as detailed in the table below.
Sensor CTs available:
Ringmaster
800/1, 400/1 or 200/1 (see Ringmaster selection guide)
Range specified:
VIP 300LH x2 or x4 range
Ringmaster range
Application
Range
RN2c, RE2c, CE2,
CN2, 200/1A CT
Transformer
protection
x2
min operating
current
20A
x4
40A
Transformer/
Feeder
Protection
x2
40A
x4
80A
Feeder
protection
x2
80A
x4
160A
RN6c
400/1A CT
CE6, RN6c
800/1A CT
Protection
Overcurrent
earth fault
Overcurrent
earth fault
Overcurrent
earth fault
Overcurrent
earth fault
Overcurrent
earth fault
Overcurrent
earth fault
Current Setting range
Minimum
Maximum
20A
100A
2A*
80A
40A
200A
4A*
160A
40A
200A
4A*
160A
80A
400A
8A*
320A
80A
400A
8A*
320A
160A
800A
16A*
640A
Example
1
2
3
4
*The earth fault pick-up can be set below minimum operating current but a load current > minimum operating current needs to
flow previous to a fault in order to ensure the relay is powered up.
SETTING RANGES x2 x4
52
7 x4 range
40A,80A
or 160A
5 minimum
operating
current
3
1
CT1
S1
P1
S2
P2
R
P1
S2
P2
Y
S2
P2
S1
S1
B
4
C11
C31
5
C31
C51
6
C51
C10
7
C70
C30
8
C50
9
C90
10
x2 range
8 20A, 40A
or 80A
minimum
6 operating
current
4
2
S2
C71
P1
C11
C70
VIP 300 IDMT RELAY
9
50/51
50N/51N
10
11
12
13
14
MITOP - ITC
Note: Connection must be made to terminals 2, 4, 6 and 8 or terminals 1, 3, 5 and 7
for the x2 or x4 setting ranges respectively.
Note: MITOP - trip coil.
10
K8
K7
(-Ve)
(+Ve)
15
16
0v
VIP 300 protection relay
Application
Selection principles
Required setting information.
Prior to making any settings, you need to know:
Ir - rated current of installation to be protected.
Current transformer:
The current transformer is specified by the panel type chosen from the Ringmaster
catalogue.
i)
Choice of range:
To select the minimum operating current and therefore required primary amp
operating range two factors can be considered.
- The load current and any possible allowable overload
(typical allowable overload for transformers is 30%)
- The earth fault level
(typically set at 0.4 times rated current Ir)
It is appropriate to choose the range which will operate above the minimum
operating current. Effectively the relay can be operated below this level, see
minimum operating note.
ii)
Choice of curve*:
There are 5 types of curve available.
SI
- Standard inverse, mainly used for feeder applications.
VI
- Very inverse, mainly used for transformer applications.
EI
- Extremely inverse, mainly used for transformer applications.
DT
- Definite time, used for timed applications.
RI
- Special applications (consult Merlin Gerin).
iii) Choice of current setting Is and Ios*:
Consider assumptions made in i) and choose the nearest appropriate current
setting.
iv) Choice of low set time delay t> and to>*:
Desired operating time depends on the interval to achieve grading with upstream
and downstream devices at the maximum and minimum fault levels. Between IDMT
characteristics a grading margin of 0.4s is desired. Between an IDMT characteristic
and a LV protective device a grading margin of 0.25s is considered acceptable.
v)
Choice of high set current setting I>> and Io>>:
I>> and Io>> are multiples of Is and Ios respectively. The high set element has the
advantage of allowing the protection upstream to reduce its operating time at high
fault levels. Grading is carried out at the instantaneous current setting and not at the
maximum fault level, therefore it can be achieved at lower currents enabling the
upstream device to operate quicker at the maximum fault level.
vi) Choice of high set time delay t>> and to>>:
Depending on grading required upstream and downstream.
*Depends on characteristics of devices upstream and downstream. The selection
principles only act as a guide to set up the VIP 300, a proper protection selectivity
study should be carried out to set up device settings.
11
VIP 300 protection relay
Application
Setting examples
Typical examples will be given.
Consider 4 examples:
1:
RN2c unit protecting a typical MV/LV 1MVA transformer.
2:
CE2 unit protecting a typical MV/LV 2MVA transformer.
3:
CE6 unit protecting a radial feeder with 4 RN2c units fed from it each feeding
4:
CE6 unit protecting the same radial feed for which a planned extension is to
1HVA transformers.
make a ring feeding 8 RN2c units, each feeding 1HVA transformers.
Example schematic
12
VIP 300 protection relay
Application - transformers
Example 1
An RN2c circuit breaker equipped with a VIP 300 feeds a 1000kVA transformer.
The transformer details are as follows:
Power rating
= 1MVA
Primary voltage = 11kV
% Impedance Zt = 5%
From this the rated current of the transformer can be calculated:
Ir =
Power
voltage x 33
=
1000 x 103 = 52.5A
11000 x 33
The HV fault level (MVAs) will be assumed to be 250MVA. The three phase LV fault level
can be calculated:
1
IFLV = 11kV x
33
112 + 112 x Zt
MVAs MVAT 100
[
1
IFLV = 11kV x
33
112 + 112 x 5
250
1
100
[
]
]
A @ 11kV
A = 972A @ 11kV
The circuit breaker is fitted with 200/1A CTs. From the above the following will now be
determined.
Choice of range:
The setting ranges available for the minimum operating currents are:
x2 range, minimum operating current = 20A setting overcurrent 20A-100A earth fault 2A-80A
x4 range, minimum operating current = 40A setting overcurrent 40A-200A earth fault 4A-160A
By considering the minimum operating current of 20A (x2 range) then the transformer rated
current is mid-point within the primary amp range. Hence there is room to consider possible
overloads and earth fault levels.
Range chosen x2 minimum operating current = 20A
Choice of curve:
In this case we are dealing with a MV/LV transformer. For this application the type of curve
selected for overcurrent protection is usually either a VI or EI characteristic. These curves
provide quicker operating times at higher fault currents to allow better protection of the
transformer primary. The selection of these curves also helps in co-ordinating with the LV
protective device on the secondary side of the transformer.
For earth fault protection the curve selected is usually a definite time characteristic and is
normally set quite low (typical 40% or 0.4 times the rated current).
I> setting
VI
Io> setting
DT
Choice of current setting:
Overcurrent Is
If a typical overload of 30% is considered for the transformer.
Is = overload x Ir = 1.3 x 52.5 = 68A
Choose the nearest available setting above this in primary amps
Is setting
72A.
Earth fault Ios
Consider a typical earth fault setting of 40% of transformer rated current, 20.8A
Ios setting
24A
DT only
setting 1
13
VIP 300 protection relay
Application - transformers
Earth fault
Choice of low set time delay:
Overcurrent t>
The time setting corresponds to the actual relay operating time at 10 x Is, in this case 720A.
The desired operating time for the relay is determined by the upstream and downstream
protective devices. In this example the downstream device is on the LV network, we therefore
have to ensure adequate time is given between the two devices upto maximum LV 3ph fault
level. It is assumed the LV device is set at 0.1s at the maximum fault level and therefore the
desired operating time for the VIP 300 is given as follows:
1000
100
10
Desired operating =
time
operating time + grading margin between
of LV device
devices
= 0.1 + 0.25
1
(see selection principles)
If this value is used as t in the formula for the VI curve selected (see page 21)
t=
13.5
[( IfIs ) -1 ]
x t>
1.5
desired time t
If (fault level)
Is (current level)
t>
= 0.35
= 972A
= 72A
=?
to>
0.1
Io>
0.01
To find t> rearrange formula
1
0.1
10
100
Current (multiples of Ios)
[( ) ]
t> = If -1 x t x 1.5
Is
13.5
Overcurrent
[( ) ]
t> = 972 -1 x 0.35 x 1.5
72
1.2 x Is
1000
13.5
By inserting the values into the formula t> = 0.486
Select 0.5 as nearest low set time delay (0.05 and x10 multiplier). The actual operating time
can now be found by placing back into the original formula.
Actual t = 0.36
t> 0.05s x10
Earth fault to>
The earth fault element can be set as low as possible as there is no need to grade with the
device on the LV of the transformer. It is set at 0.1 to avoid spurious operation under transient
conditions such as magnetizing inrush.
to> 0.1s
x1
100
10
1
t>
10 x Is
0.1
Choice of high set current setting:
t>>
Overcurrent I>>
The high set instantaneous element is a multiple of the setting current Is> and in this case is
graded with the LV protective device. The maximum fault current the LV protective device will
see is the 3ph LV fault level, 972A. Hence above 972A the high set can be implemented.
Instantaneous = 15 x 72 = 1080 which is above 972A
I>> = 15
Earth fault Io>>
The high set earth fault element is a multiple of the setting current Ios>. The high set element
for the earth fault is not used in this case and should be set in the off position.
0.01
1
10
100
Current (multiples of Is)
Io>> off
Choice of high set time delay:
Dependent on upstream and downstream protection. In this case the phase
overcurrent high set time delay t>> is set to the minimum 0.03 as downstream
grading has been accounted for. Earth fault high set time delay to>> is
disabled as high set is in off position.
t>>
0.03
to>> 0.03 (disabled as high set is in off position).
phase
overcurrent
sensors:
200/1 4509996A0
VIP300LH range: x2
I>
I>
EI
42 48 56
36
64
30
72
24
80
20 100 90
(A)
Is
9
2.4
1.2
(s)
curve selection
2.7
1
VIP 300
2.1
1.8
1.5
off
DT
trip
I>>
DT only
VI
SI
RI
(x Is) 3
15
20
3
(x Is) off
0.2
0.15 0.2
0.3
0.1
0.07
warning
x10
0.4
0.05
not time
multiplier
x1
0.6
t>
see table
12
6
4
0.4
0.6
0.1
0.05
0.9
0.03
1.5
(s)
t>>
VIP 300
Settings
Equivalent Time
Multiplier
t>
to>
SI
VI
EI
0.05
0.07
0.1
0.15
0.2
0.3
0.4
0.05
0.6
0.07
0.1
0.15
0.2
0.3
0.4
0.6
x1
x1
x1
x1
x1
x1
x1
x10
x1
x10
x10
x10
x10
x10
x10
x10
0.02
0.02
0.03
0.05
0.07
0.10
0.13
0.17
0.20
0.24
0.34
0.50
0.67
1.01
1.35
2.02
0.03
0.05
0.07
0.10
0.13
0.20
0.27
0.33
0.40
0.47
0.67
1.00
1.33
2.00
2.67
4.00
0.06
0.09
0.12
0.19
0.25
0.37
0.50
0.62
0.74
0.87
1.24
1.86
2.48
3.71
4.95
7.43
reset
minimum operating
phase current: 20A
Io>
EI
2.1
1.8
SI
DT
9
2.4
1.5
off
RI
trip
Io>>
DT only
VI
1.2
2.7
1
(s)
3
12
15
6
4
20
3
(x Ios) off
curve selection
Io>
earth fault
14
16 24 32
12
40
8
50
4
60
2 80 70
(A)
Ios
0.15 0.2
0.1
0.07
0.05 (s)
to>
0.2
0.3
0.4
0.6
warning
x10
x1
not time
multiplier
0.03
see table
to>>
0.4
0.6
0.1
0.05
0.9
(s)
1.5
VAP6 test plug
VIP 300 protection relay
Application - transformers
Example 2
Principles as example 1
A CE2 circuit breaker feeds a typical MV/LV 11kV 2MVA transformer. Transformer impedance
and fault level as in example 1.
The rated current for a 2MVA transformer.
= 2000 x 103 = 105A
Ir = power
voltage x 33
11000 x 33
Choice of range:
The load current exceeds the current range for the x2 setting thus the x4 setting is appropriate.
Range chosen x4
minimum operating current = 40A
Choice of curve:
For this example we are dealing with a similar MV/LV application, the curve types are as
selected as follows.
I> setting
Io> setting
EI
DT
Choice of current setting:
A typical overload of 30% and earth fault level of 40% are considered as in
example 1.
Is
Ios
144A
48A
Choice of Iow set time delay:
Overcurrent t>, The LV 3 phase fault level = 1809A @ 11kV (using formula in
example 1).
t=
80
x
[( IfIs ) -1 ]
t> = 1809 -1
[( 144 ) ]
2
2
t>
0.808
x 0.35 x 0.808 = 0.55
phase
overcurrent
sensors:
200/1 4509996A0
VIP300LH range: x4
I>
80
I>
EI
1.8
off
t>
to>
0.6
0.1
x1
x1
Choice of high set current:
As before
1
(x Is)
84 96 112
72
128
60
144
48
160
40 200 180
(A)
Is
3
15
4
20
3
(x Is) off
0.2
0.15 0.2
warning
0.3
0.1
0.07
x10
0.4
0.05
not time
multiplier
x1
0.6
t>
see table
12
6
0.4
0.6
0.1
0.05
0.9
0.03
1.5
(s)
t>>
VIP 300
Settings
Equivalent Time
Multiplier
t>
to>
SI
VI
EI
0.05
0.07
0.1
0.15
0.2
0.3
0.4
0.05
0.6
0.07
0.1
0.15
0.2
0.3
0.4
0.6
x1
x1
x1
x1
x1
x1
x1
x10
x1
x10
x10
x10
x10
x10
x10
x10
0.02
0.02
0.03
0.05
0.07
0.10
0.13
0.17
0.20
0.24
0.34
0.50
0.67
1.01
1.35
2.02
0.03
0.05
0.07
0.10
0.13
0.20
0.27
0.33
0.40
0.47
0.67
1.00
1.33
2.00
2.67
4.00
0.06
0.09
0.12
0.19
0.25
0.37
0.50
0.62
0.74
0.87
1.24
1.86
2.48
3.71
4.95
7.43
reset
minimum operating
phase current: 20A
I>> 15
Io>> off (disabled)
Choice of high set time delay:
2.7
curve selection
trip
9
2.4
1.2
DT
VIP 300
2.1
1.5
RI
The earth fault element is set as before
I>>
DT only
VI
SI
Io>
EI
2.1
1.8
off
DT
9
2.4
1.5
RI
trip
Io>>
DT only
VI
SI
1.2
2.7
1
(s)
3
12
15
6
4
20
3
(x Ios) off
curve selection
As before
t>> 0.03
to>> 0.03 (not used as high set
current in off position).
Io>
earth fault
32 48 64
24
40
16
100
8
120
4 160 140
(A)
Ios
0.15 0.2
0.1
0.07
0.05 (s)
to>
0.2
0.3
0.4
0.6
warning
x10
x1
not time
multiplier
0.03
see table
to>>
0.4
0.6
0.1
0.05
0.9
(s)
1.5
VAP6 test plug
15
VIP 300 protection relay
Application - feeders
Example 3
A CE6 unit protects an 11kV radial feed feeding 4 RN2c units each subsequently feeding
1000kVA transformers. The CE6 is an extensible 630A circuit breaker complete with 800/1A
CTs.
Effective load current.
Ir =
power
= 4000 x 103
voltage x 33
11000 x 33
= 210A
The HV three phase fault level is assumed as 250MVA. The earth fault level is assumed as
100 MVA. The corresponding fault current can be calculated from:
I3ph
=
I1ph
=
MVAs
voltage x 33
6
= 250 x 10 = 13121A
11000 x 33
6
MVAEF
= 100 x 10 = 5248A
voltage x 33
11000 x 33
Choice of range:
min. operating current = 80A x2 range
min. operating current = 160A x4 range
overcurrent 80A - 400A
overcurrent 160A - 800A
earth fault
earth fault
8A - 320A
8A - 640A
By selecting the minimum operating current of 80A (x2 range) then the feeder rated current is
in the midpoint of the range.
Range chosen x2 minimum operating current = 80A
Choice of curve:
This example deals with feeder protection, SI or VI curves are suitable as they have slower
operating times for high fault levels. It depends on the device upstream and downstream and
the discrimination to be achieved at the HV fault level.
I>
Io>
SI
SI
Choice of current setting:
Overcurrent protection should take into account the max load current, 210A, and possible
overload of one or more of the transformers. Earth fault protection assumes a 40% earth fault.
Is
Ios
256A
96A
Choice of low set time delay setting:
Overcurrent:
Consider example 1 as downstream device with t> setting equal to 0.5, a t> setting of 1.5 for
the upstream device gives adequate margin over the entire characteristic t> 0.15 x 10.
16
VIP 300 protection relay
Application - feeders
For the earth fault element the downstream device operates at 0.1s, therefore the required
operating time for the upstream relay is 0.5s at the maximum phase - earth fault level.
t
=
0.14
If 0.02 -1
Is
[( )
]
x
to>
2.97
desired time t
If (fault level)
Is (current setting)
to>
= 0.5
= 5248A
= 96A
=?
To find to> rearrange formula
to> =
[( IfIs )
0.02
-1
]
x t x 2.97
0.14
to> =
-1] x 0.5 x 2.97
[(5248
96 )
0.02
0.14
By inserting the values into the formula to> = 0.88 select 1.0 as nearest setting.
The actual operating time can now be found by placing back into the formula above.
Desired operating time t = 0.57
to> 0.1s
x10
Choice of high set:
Disabled for this application.
Earth fault
I>> off
Io>> off
1.2 x Is
1000
Choice of high set time delay:
100
Disabled as high set is in off position set at minimum t>> & to>> = 0.03
10
t>
1
phase
overcurrent
sensors:
800/1 4509996A0
VIP300LH range: x2
I>
I>
I>>
DT only
EI
VI
1.8
SI
2.1
DT
9
2.4
1.5
off
RI
1.2
(s)
2.7
1
VIP 300
(x Is) 3
12
15
6
4
20
3
(x Is) off
curve selection
trip
168 192 224
144
256
120
288
96
320
80 400 360
(A)
Is
0.2
0.15 0.2
0.3
0.1
0.07
x10
0.4
0.05
warning
not time
multiplier
x1
0.6
t>
see table
0.4
0.6
0.1
0.05
0.9
0.03
1.5
(s)
t>>
VIP 300
Settings
t>
0.05
0.07
0.1
0.15
0.2
0.3
0.4
0.05
0.6
0.07
0.1
0.15
0.2
0.3
0.4
0.6
to>
x1
x1
x1
x1
x1
x1
x1
x10
x1
x10
x10
x10
x10
x10
x10
x10
SI
VI
EI
0.02
0.02
0.03
0.05
0.07
0.10
0.13
0.17
0.20
0.24
0.34
0.50
0.67
1.01
1.35
2.02
0.03
0.05
0.07
0.10
0.13
0.20
0.27
0.33
0.40
0.47
0.67
1.00
1.33
2.00
2.67
4.00
0.06
0.09
0.12
0.19
0.25
0.37
0.50
0.62
0.74
0.87
1.24
1.86
2.48
3.71
4.95
7.43
reset
minimum operating
phase current: 20A
Io>
off
1.2
2.7
1
DT
9
2.4
1.5
RI
trip
2.1
1.8
EI
(s)
3
0.1
0.01
1
100
12
15
6
4
1000
20
3
10
Current (multiples of Ios)
Overcurrent
Io>>
DT only
VI
SI
10 x Is
Equivalent Time
Multiplier
1.2 x Is
(x Ios) off
curve selection
100
Io>
earth fault
64 96 128
48
160
32
200
16
240
8 320 280
(A)
Ios
0.15 0.2
0.1
0.07
0.05 (s)
to>
0.2
0.3
0.4
0.6
warning
x10
x1
not time
multiplier
0.05
0.03
see table
to>>
0.4
0.6
0.1
0.9
(s)
10
1.5
VAP6 test plug
t>
1
10 x Is
0.1
0.01
1
10
100
Current (multiples of Is)
17
VIP 300 protection relay
Application - feeders
Example 4
An extension is planned for the system to feed another 4 RN2c units in a ring as shown in the
diagram, the CE6 ring feeders would have to be capable of feeding the load on the ring.
Example carried out as example 3.
Choice of range
Load rating exceeds range x2 maximum, 420A.
Rating chosen x4 minimum operating current = 160A
Choice of curve
As example 3.
Choice of current setting
Is
512A
Iso
192A
Choice of low set time delay
calculated similarly to example 3
t>
to>
0.15
0.07
x10
x10
Choice of high set
As example 3.
Choice of high set time delay
As example 3.
phase
overcurrent
sensors:
800/1 4509996A0
VIP300LH range: x4
I>
I>
I>>
DT only
EI
VI
DT
1.2
(s)
2.7
1
(x Is) 3
curve selection
trip
336 384 448
288
512
240
576
192
640
160 800 720
(A)
Is
9
2.4
1.5
off
RI
VIP 300
2.1
1.8
SI
15
6
4
20
3
(x Is) off
0.2
0.15 0.2
warning
0.3
0.1
0.07
x10
0.4
0.05
not time
multiplier
x1
0.6
t>
see table
12
0.4
0.6
0.1
0.05
0.9
0.03
1.5
(s)
t>>
VIP 300
Settings
Equivalent Time
Multiplier
t>
to>
SI
VI
EI
0.05
0.07
0.1
0.15
0.2
0.3
0.4
0.05
0.6
0.07
0.1
0.15
0.2
0.3
0.4
0.6
x1
x1
x1
x1
x1
x1
x1
x10
x1
x10
x10
x10
x10
x10
x10
x10
0.02
0.02
0.03
0.05
0.07
0.10
0.13
0.17
0.20
0.24
0.34
0.50
0.67
1.01
1.35
2.02
0.03
0.05
0.07
0.10
0.13
0.20
0.27
0.33
0.40
0.47
0.67
1.00
1.33
2.00
2.67
4.00
0.06
0.09
0.12
0.19
0.25
0.37
0.50
0.62
0.74
0.87
1.24
1.86
2.48
3.71
4.95
7.43
reset
minimum operating
phase current: 20A
Io>
EI
2.1
1.8
off
DT
9
2.4
1.5
RI
trip
Io>>
DT only
VI
SI
1.2
2.7
1
(s)
3
12
15
6
4
20
3
(x Ios) off
curve selection
Io>
earth fault
18
128192 256
96
320
64
400
32
480
16 640 560
(A)
Ios
0.15 0.2
0.1
0.07
0.05 (s)
to>
0.2
0.3
0.4
0.6
warning
x10
x1
not time
multiplier
0.03
see table
to>>
0.4
0.6
0.1
0.05
0.9
(s)
1.5
VAP6 test plug
VIP 300 protection relay
Technical characteristics
Phase overcurrent
I>
t>
I>>
t>>
Accuracy
- three phase
(5% or 0/+2A
- single phase
(10% or 0/+4A
Low set time delay
- definite time
( 2% or ( 20ms *(see note)
- IDMT
class 5 according to IEC 255-3 *(see note)
High set
(5%
High set time delay
(2% or (20ms *(see note)
% of pick-up
95%
storage time
20ms
*Operating times refer to when the relay is powered up, the tripping times indicated do not include the Mitop response time.
When the relay is switched onto a fault the operating time will be extended by:
+30ms at 1.5ls
+20ms from 2ls to 10ls
+10ms above 10ls
Low set
Earth fault
Accuracy
Low set - three phase
(5% or 0/+2A
- single phase
(10% or 0/+4A
to> Low set time delay
- Definite time
(2% or (20ms *(see note)
- IDMT
class 5 according to IEC 255-3 *(see note)
Io>> High set
(5%
to>> High set time delay
(2% or (20ms *(see note)
% of pick up
95%
storage time
20ms
*Operating times refer to when the relay is powered up, the tripping times indicated do not include the Mitop response time.
When the relay is switched onto a fault the operating time will be extended by:
+30ms at 1.5ls
+20ms from 2ls to 10ls
+10ms above 10ls
Io>
General characteristics
Value
Operating frequency
Operating temperature
Storage temperature
Continuous rating
Continuous rating
50Hz +10%, 60Hz +10%
-25$C to +70$C
-40$C to +85$C
240A
960A
With Ringmaster 200/1A CT
With Ringmaster 800/1A CT
Environment &
electromagnetic capability
Standard
Severity
Vibration
Enclosure protection index
Sensor input isolation
1.2/50 +s impuse voltage
1MHz dampened oscillating wave
IEC 255-21-1
EN 60529
IEC 255-5
IEC 255-5
IEC 255-22-1
Rapid transient bursts
1.2/50 (8-20+s) hybrid wave
Electrostatic discharge
Radio frequency on I/Os
HF electromagnetic field
IEC 255-22-4
IEC 1000-4-5
IEC 255-22-2
EN 50082-2
IEC 255-22-3
EN 50082-2
EN 50082-3
EN 50082-2
IEC 1000-4-8
EN 50081
Class 2
IP54(cover closed) IP20(cover open)
2kV rms, 50 Hz, 1mn
5kV
2.5kV cm
1kV dm
4kV cm and dm, 5kHz burst
2kV 42 ohms
8kV in air 6kV on contact
10V,0.15 to 80 MHz
30V/m not modulated, 27 to 1000 MHz
10V/m mod. ampl., 80 to 1000MHz
11V/m mod. impuls., 900MHz
30A/m steady
300A/m, 1s
30 dB+V/m at 10m, 30 to 230MHz
37 dB+V/m at 10m, 230 to 1000MHz
50/60 Hz magnetic field
Radiant field emitted
19
VIP 300 protection relay
IDMT tripping curves
IDMT tripping curves
■
The graphs in this section represent the 8 time delay settings for t> and to>
available on the x1 and x10 ranges.
■
The low set pick-up settings I> and Io> are fixed at 1.2xIs and 1.2xIso
respectively for the IDMT characteristics.>
■
The numbers given on the right of the curves represent the position of the time
delay selector switch t> or to>. They correspond to the actual operating time
at a current of 10 times the pick-up.
■
If the multiplying factor x1/x10 is in the x10 position, multiply the time delay
selector settings by 10 (see x10 graph).
■
The phase overcurrent and earth fault protection curves are the same.
SI current/time curves with selector
switch on the x1 setting
Current in amperes
1000
1.0 A
100
10
Time
in
seconds
t> 0.6
t> 0.4
t> 0.3
t> 0.2
t> 0.15
t> 0.1
t> 0.07
t> 0.05
1
0.10
0.01
1
10
100
Standard inverse
Standard Inverse (x1).tcc Ref. Voltage: 11000 Current Scale x10^0
t=
SI current/time curves with selector
switch on the x10 setting
1000
( )
Current in amperes
1.0 A
100
t> 6
t> 4
t> 3
t> 2
t> 1.5
t> 1
t> 0.7
t> 0.5
10
Time
in
seconds
1
0.10
0.01
1
10
100
Standard Inverse (x10).tcc Ref. Voltage: 11000 Current Scale x10^0
20
0.14 x t>
2.97
I 0.02
-1
Is
VIP 300 protection relay
IDMT tripping curves
VI current/time curves with selector
switch on the x1 setting
1000
Current in amperes
1.0 A
100
t> 0.6
t> 0.4
t> 0.3
t> 0.2
t> 0.15
t> 0.1
t> 0.07
t> 0.05
10
Time
in
seconds
1
0.10
Very inverse
0.01
1
t=
10
100
Very Inverse (x1).tcc Ref. Voltage: 11000 Current Scale x10^0
13.5 x t>
I
1.5
-1
Is
( )
VI current/time curves with selector
switch on the x10 setting
1000
Current in amperes
1.0 A
t> 6
t> 4
t> 3
t> 2
t> 1.5
t> 1
t> 0.7
t> 0.5
100
10
Time
in
seconds
1
0.10
0.01
1
10
100
Very Inverse (x10).tcc Ref. Voltage: 11000 Current Scale x10^0
RI curve
(Specific application - please consult Merlin Gerin)
21
VIP 300 protection relay
IDMT tripping curves
EI current/time curves with selector
switch on the x1 setting
1000
1.0 A
Current in amperes
100
t> 0.6
t> 0.4
t> 0.3
t> 0.2
t. 0.15
t> 0.1
t> 0.07
t> 0.05
10
Time
in
seconds
1
0.10
Extremely inverse
t=
0.01
1
10
100
Extremely Inverse (x1).tcc Ref. Voltage: 11000 Current Scale x10^0
EI current/time curves with selector
switch on the x10 setting
1000
Current in amperes
1.0 A
t> 6
t> 4
t> 3
t> 2
t> 1.5
t> 1
t> 0.7
t> 0.5
100
10
Time
in
seconds
1
0.10
0.01
1
10
100
Extremely Inverse (x10).tcc Ref. Voltage: 11000 Current Scale x10^0
22
80
I
Is
2
( ) -1
x
t>
0.808
VIP 300 protection relay
DT tripping curves
DT tripping curves
■
The graphs below represent the 8 low set pick-up settings
for I> and Io> and the 8 time delay settings for t> and to> available on the x1
and x10 ranges.
■
The low set pick up settings I> and Io> are variable between 1 and 3 times Is
and Ios respectively.
■
The numbers given at the top of the curves represent the variable setting of
the low set selector switch I> and Io>. The numbers given on the right of the
curves represent the position of the time delay sector switch t> or to>.
■
If the multiplying factor x1/x10 is in the x10 position, multiply the time delay
selector settings by 10 (see x10 graph).
■
The phase overcurrent and earth fault protection curves are the same.
DT current/time curves with selector
switch on the x1 setting
DT current/time curves with selector
switch on the x10 setting
Current in amperes
1000
Current in amperes
1000
100
100
10
10
Time
in
seconds
t> 6
t> 4
t> 3
t> 2
t> 1.5
t> 1
t> 0.7
t> 0.5
Time
in
seconds
1
1
t> 0.6
t> 0.4
t> 0.3
t> 0.2
t> 0.15
t> 0.1
t> 0.07
t> 0.05
0.10
0.01
1
10
0.10
100
Definite Time (x1).tcc Ref. Voltage: 11000 Current Scale x10^0
0.01
1
10
100
Definite Time (x10).tcc Ref. Voltage: 11000 Current Scale x10^0
23
MGMV 5477
Merlin Gerin Medium Voltage 123 Jack Lane, Hunslet, Leeds LS10 1BS UK
Tel: +44 (0)113 290 3500 Fax: +44 (0)113 290 3710 www.schneider.co.uk
JAN 2004