Table 25. Auxiliary DC supply voltage influence on functionality during operation
Dependence on Reference value Within nominal
range
Influence
Ripple, in DC auxiliary voltage
Operative range
max. 2%
Full wave
rectified
15% of EL 0.01%/%
Auxiliary voltage dependence,
operate value
±20% of EL 0.01%/%
Interrupted auxiliary DC voltage
24-60 V DC ± 20%
90-250 V DC ± 20%
Interruption
interval
0–50 ms
No restart
0–∞ s Correct behaviour at power down
Restart time < 300 s
Table 26. Frequency influence (reference standard: IEC 60255–1)
Dependence on Within nominal range Influence
Frequency dependence, operate value f
r
±2.5 Hz for 50 Hz
f
r
±3.0 Hz for 60 Hz
±1.0%/Hz
Frequency dependence for distance protection operate value f
r
±2.5 Hz for 50 Hz
f
r
±3.0 Hz for 60 Hz
±2.0%/Hz
Harmonic frequency dependence (20% content)
2
nd
, 3
rd
and 5
th
harmonic of f
r
±2.0%
Harmonic frequency dependence for distance protection (10%
content)
2
nd
, 3
rd
and 5
th
harmonic of f
r
±10.0%
Harmonic frequency dependence for high impedance differential
protection (10% content)
2
nd
, 3rd and 5
th
harmonic of f
r
±10.0%
Harmonic frequency dependence for overcurrent protection
2
nd
, 3
rd
and 5
th
harmonic of f
r
±3.0%
Line differential protection RED670
1MRK 505 379-BEN N
72 Hitachi Power Grids
© Copyright 2017 Hitachi Power Grids. All rights reserved
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