Arcteq Generator Commander, Instruction Manual

Page: 546 / 561

10.2.1.17 Voltage-restrained overcurrent protection (Iv>; 51V)
Table. 10.2.1.17 - 458. Technical data for the voltage-restrained overcurrent protection function.
Measurement inputs
Current inputs Phase current inputs: I
L1
(A), I
L2
(B), I
L3
(C)
Current input magnitudes RMS phase currents
Voltage inputs
U
L1
, U
L2
, U
L3
U
L12
, U
L23
, U
L31
+ U
0
Voltage input calculation Positive sequence voltage
Pick-up
Pick-up current setting (point 1 & 2)
0.10…40.00 × I
N
, setting step 0.01 × I
N
Pick-up voltage setting (point 1 & 2) 0.05…150.00 %U
N
, setting step 0.01 %U
N
Inaccuracy:
- Current
- Voltage
±0.5 %I
SET
or ±15 mA (0.10…4.0 × I
SET
)
±1.5 %U
SET
or ±30 mV
Operation time
Definite time function operating time setting 0.00…1800.00 s, setting step 0.005 s
Inaccuracy:
- Definite time (I
M
/I
SET
ratio 1.05
→
) ±1.0 % or ±25 ms
IDMT setting parameters:
k Time dial setting for IDMT
A IDMT constant
B IDMT constant
C IDMT constant
0.01…25.00, step 0.01
0…250.0000, step 0.0001
0…5.0000, step 0.0001
0…250.0000, step 0.0001
Inaccuracy:
- IDMT operating time
- IDMT minimum operating time
±1.5 % or ±20 ms
±20 ms
Instant operation time
Start time and instant operation time (trip):
- I
M
/I
SET
ratio 1.05
→
<40 ms
Reset
Reset ratio:
- Current 97 % of the pick-up current setting
Reset time setting
Inaccuracy: Reset time
0.000…150.000 s, step 0.005 s
±1.0 % or ±25 ms
Instant reset time and start-up reset <45 ms
10.2.1.18 100 % stator earth fault protection (U03rd>; 64S)
Table. 10.2.1.18 - 459. Technical data for the 100 % stator earth fault protection function.
Measurement updates
Current inputs
Phase current inputs: I
L1
(A), I
L2
(B), I
L3
(C)
Current input calculation Positive sequence current (I1)
Voltage inputs Residual voltage from U3 or U4 voltage channel
Voltage input magnitude Zero sequence voltage third harmonic
Pick-up
Pick-up voltage setting
1.00…95.00 %U0
N
, setting step 0.01 %U0
N
Genera Generattor Commander or Commander
Instruction manual
Version: 2.07
544 © Arcteq Relays Ltd
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