ABB RET670 Product Manual page 46

Transformer protection RET670
Customized
Product version: 1.2
Table 21. Frequency influence (reference standard: IEC 60255–1)
Dependence on
Frequency dependence, operate value
Frequency dependence for distance
protection operate value
Harmonic frequency dependence (20%
content)
Harmonic frequency dependence for
distance protection (10% content)
Harmonic frequency dependence for high
impedance differential protection (10%
content)
46
Within nominal range
f ± 2.5 Hz for 50 Hz
r
f ± 3.0 Hz for 60 Hz
r
f ± 2.5 Hz for 50 Hz
r
f ± 3.0 Hz for 60 Hz
r
2nd, 3rd and 5th harmonic of f
2nd, 3rd and 5th harmonic of f
2nd, 3rd and 5th harmonic of f
1MRK 504 117-BEN D
Influence
± 1.0% / Hz
±2.0% / Hz
± 1.0%
r
± 6.0%
r
±5.0%
r
ABB