ABB Relion 670 Series Product Manual page 67

Bay control REC670
Version 2.2
Differential protection
Table 34. High impedance differential protection, single phase HZPDIF
Function
Operate voltage
Reset ratio
Maximum continuous power
Operate time at 0 to 10 x U
Reset time at 10 x U to 0
d
Critical impulse time
Operate time at 0 to 2 x U
Reset time at 2 x U to 0
d
Critical impulse time
1) 2
The value U Trip/ R should always be lower than Stabilizing resistor thermal rating to allow continuous activation during testing. If this value is exceeded, testing should be
done with a transient faults. Typical value for the thermal rating of the resistor is 100W.
Hitachi Power Grids
Range or value
(10-900) V
I=U/R
>95% at (30-900) V
1)
See
Min. = 5 ms
d
Max. = 15 ms
Min. = 75 ms
Max. = 95 ms
2 ms typically at 0 to 10 x U
Min. = 25 ms
d
Max. = 35 ms
Min. = 50 ms
Max. = 70 ms
15 ms typically at 0 to 2 x U
© Copyright 2017 Hitachi Power Grids. All rights reserved
M13081-1 v13
Accuracy
±1.0% of I at I ≤ I
r
±1.0% of I at I > I
-
-
-
d
-
d
1MRK 511 404-BEN N
r
r
67