VAMP 210
Generator protection relay
Technical description
VAMP Ltd
8
Vamp 24h support phone: +358 (0)20 753 3264
VM210.EN004
Parameters of the overcurrent stages:
I>, I>> (50/51)
Parameter: Value/unit:
Measured
value
ILmax
A
Corresponding primary value
I>, I>>
A
Setting value in primary
current units
I>, I>>
_ x Ign
Setting value as compared to
the generator rated current
Ign = Sgn/(Ugn x SQRT(3))
curve DT
Definite
time
NI, VI,
EI, LTI
Inverse time
t>, t>>
s
Operating time
Setting
values
k>
Time multiplier at inverse
time (I>)
SCntr
Cumulative
start
counter
TCntr
Cumulative trip counter
1-N, 2-N,
3-N
Fault type/single-phase fault
e.g.: 1-N = fault on phase L1
1-2, 2-3,
1-3
Fault type/two-phase fault
e.g.: 2-3 = fault between L2
and L3
Type
1-2-3
Fault type/three-phase fault
Flt xIn
Max. value of fault current as
compared to In
Load A
1 s mean value of pre-fault
phase currents IL1…IL3
Recorded
values
EDly %
Elapsed time as compared to
the set operating time, 100% =
tripping
The low-set stage (I>) of the overcurrent unit can be configured
for inverse time characteristic. Four sets of characteristic
curves according to IEC 60255-3 are available for the low-set
stage, i.e.: Normal Inverse (NI), Very Inverse (VI), Extremely
Inverse (EI) and Long Time Inverse (LTI).
Limitations:
1.
The maximum measured current is 50 x I
n
. This limits the
scope of inverse curves when the setting is more than 2.5 x
I
n
. See Figure 2.1-1. E.g. at setting 4 x I
n
the maximum
setting relative current is 12.5 x I
set
/I
n
although the curves
are defined up to 20 x I
set
/I
n
2.
The fastest possible operating time is about 60 ms at
inverse time characteristic according to curve types VI and
EI.