VAMP Ltd
Generator protection relay
Operation and configuration
VAMP 210
VM210.EN004
Vamp 24h support phone: +358 (0)20 753 3264
33
Turns ratios of the voltage and current transformers:
Current transformer (CT)
Inom
500 A
(Conf/current scaling)
Isec
5 A
Voltage transformer (VT)
Unom
6000 V
(Conf/voltage scaling)
sec
100 V
U0sec
100
V
Core-balance current transformer I (CT)
I01n
50 A
(Conf/Io1 scaling)
t01sec
5 A
Core-balance current transformer II (CT)
I02n
50 A
(Conf/Io2 scaling)
(not always used)
I02sec 5
A
2 Calculation and selection of setting values:
The generator protection relay automatically calculates the
value of the rated current I
gn
of the generator from the set S
gn
and U
gn
values using the following expression:
A
kVa
U
S
I
gn
gn
gn
550
6300
3
6000
3
=
⋅
=
⋅
=
Overcurrent stage I> (51):
SET I>
I> k
Type
1.20 1.50
NI
Overvoltage stage U> (59):
SET U>
U> t>
115%
3.00 s
Overvoltage stage U>> (59):
SET U>>
U>> t>>
140% 0.40
s
Undervoltage stage U1< (27):
SET U<
U1< t<
NoCmp
I<Blk
80% 10.00
s 20% 10.00
s
Reverse power stage P< (32):
SET P<
P< t<
-4% 2.00
s
Unbalanced load stage I
2
>:
SET I2>
I2 K1>
Type
8% 20.00
s INV
