ABB Relion 670 Series Product Manual page 94

Generator protection REG670
Version 2.2
Table 74. Voltage differential protection VDCPTOV
Function
Voltage difference for alarm and trip
Under voltage level
Independent time delay for voltage
differential alarm at 0.8 x UDAlarm to 1.2 x
UDAlarm
Independent time delay for voltage
differential trip at 0.8 x UDTrip to 1.2 x
UDTrip
Independent time delay for voltage
differential reset at 1.2 x UDTrip to 0.8 x
UDTrip
Table 75. 100% Stator E/F 3rd harmonic STEFPHIZ
Function
Fundamental frequency level UN (95%
Stator EF)
Third harmonic differential level
Third harmonic differential block level
Independent time delay to operate for
fundamental UN > protection at 0 to 1.2 x
UNFund>
Independent time delay to operate for 3rd
harm-based protection at 0 to 5 x
UN3rdH<
Filter characteristic:
Fundamental
Third harmonic
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SEMOD166919-2 v7
Range or value
UBase
(2.0–100.0) % of
(1.0–100.0) % of UBase
(0.000–60.000)s
(0.000–60.000)s
(0.000–60.000)s
SEMOD175168-2 v7
Range or value
UBase
(1.0–50.0)% of
(0.5–10.0)% of UBase
UBase
(0.1–10.0)% of
(0.020–60.000) s
(0.020–60.000) s
Reject third harmonic by 1–
40
Reject fundamental
harmonic by 1–40
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Accuracy
±0.5% of U
r
±0.5% of U
r
±0.2% or ±40 ms whichever is greater
±0.2% or ±40 ms whichever is greater
±0.2% or ±40 ms whichever is greater
Accuracy
±0.25% of U
r
±0.25% of U
r
±0.25% of U
r
±0.2% or ±40 ms whichever is greater
±0.2% or ±40 ms whichever is greater
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1MRK 502 074-BEN M
Hitachi Power Grids