The healthy condition close to the rated
values (that is, V/Hz below the set pickup
value) must be applied first when the
operate time of a function is tested.
Otherwise, an additional delay of up to 50
ms should be added to stated operate
times.
SEMOD166919-2 v7
Table 79. Voltage differential protection VDCPTOV
Function
Range or value
Accuracy
Voltage difference for alarm and trip
(2.0–100.0) % of
UBase
±0.5% of U
r
Under voltage level
(1.0–100.0) % of
UBase
±0.5% of U
r
Independent time delay for voltage differential
alarm at 0.8 x UDAlarm to 1.2 x UDAlarm
(0.000–60.000)s
±0.2% or ±40 ms whichever is greater
Independent time delay for voltage differential
trip at 0.8 x UDTrip to 1.2 x UDTrip
(0.000–60.000)s
±0.2% or ±40 ms whichever is greater
Line differential protection RED670
1MRK 505 379-BEN R
Version 2.2
Hitachi Energy
115
© 2017 - 2022 Hitachi Energy. All rights reserved
Содержание Relion 670 Series
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