VAMP 130
Overcurrent and earth-fault relay
Technical Description
VAMP Ltd
14
Vamp 24h support phone : +358 (0)40 573 6316
VM130.EN003
Parameters of the earth-fault stages:
I
0
>, I
0
>>, Io>>> (50/51N)
Parameter:
Value/unit:
Measured
value
I
0
A
Earth-fault current in primary
value
I
0
>, I
0
>>,
Io>>>
A
Setting value in primary
current units
I
0
>, I
0
>>,
Io>>>
pu
Setting value as per unit value
DT
Operation charact./ definite
time (Io>)
Curve
NI, VI
EI, LTI
Operation charact./ inverse time
(Io>)
t>,
t>>,t>>>
s Operation
time
Setting
values
K
Time multiplier at inverse time
(Io>)
SCntr
Start counter (Start) reading
TCntr
Trip counter (Trip) reading
Flt
pu
Max. value of fault current as
compared to I
0n
Recorded
values
EDly
%
Elapsed time as compared to
the set operate time, 100% =
tripping
2.2.3.
Phase unbalance protection I
2
> (46)
The purpose of the phase unbalance protection is to detect phase
discontinuity and abnormal unbalance of the power system.
The operation of the unbalanced load function is based on the
relation between the negative phase sequence I
2
and the positive
phase sequence I
1
. For the relay to be able to measure the
correct unsymmetry, it is important that the phase order of the
energizing currents is correct.
The phase unbalance protection operates with definite time
characteristic and it is mainly used for signalling.
The setting of the phase unbalance protection is performed in
the menu called IL SETTING/I2> Set.
