VAMP 210 - Residual Voltage Protection (59 N)

VAMP Ltd Generator protection relay
Technical description
VAMP 210
VM210.EN004 Vamp 24h support phone: +358 (0)20 753 3264
21
Parameters of the earth fault protection:
I
0
>, I
0
>> (50N/51N)
Parameter: Value/unit:
Measured
value
I
01
A Primary earth-fault current I
01
Display I
0
>, I
0
>> A Setting value I
0
I
0
>, I
0
>> pu Setting value
DT Definite time curve
NI, VI,
EI, LTI
Inverse time (I
0
>)
t>, t>> s
Operating time at definite time
function
Setting
values
k>
Time multiplier at inverse time
(I
0
>)
SCntr Cumulative start counter
TCntr Cumulative trip counter
Flt pu Max. fault value
Recorded
values
EDly %
Elapsed time as compared to the
set operating time, 100% =
tripping
I
02
>, I
02
>> (50N/51N)
Parameter: Value/unit:
Measured
value
I
02
A
Earth-fault current I
02
as primary
value.
Display I
02
>, I
02
>> A Start current in primary units
I
02
>, I
02
>> pu
Start current value in relation to
the rated current Io2n
t>, t>> s
Operating time at definite time
function
Setting
values
k> Time multiplier at inverse time
SCntr Cumulative start counter
TCntr Cumulative trip counter
Flt pu Max. fault value
Recorded
values
EDly %
Elapsed time as compared to the
set operating time, 100% =
tripping
2.2.6. Residual voltage protection (59N)
If the generator is connected to the power system via a unit
transformer, the stator earth-fault protection of the generator
is typically realized with a neutral overvoltage function. The
neutral voltage is measured with a voltage transformer
connected between the generator neutral and earth. The
neutral voltage function comprises two overvoltage stages, both
with separately adjustable definite time operation delays.