ABB RELION 670 Series Product Manual page 89

Transformer protection RET670 2.1 IEC
Table 67. Voltage differential protection VDCPTOV
Function
Voltage difference for alarm
and trip
Under voltage level
Independent time delay for
voltage differential alarm at
0.8 to 1.2 x UDAlarm
Independent time delay for
voltage differential trip at 0.8
to 1.2 x UDTrip
Independent time delay for
voltage differential reset at 1.2
to 0.8 x UDTrip
Table 68. Loss of voltage check LOVPTUV
Function
Operate voltage
Pulse timer when
disconnecting all three phases
Time delay for enabling the
functions after restoration
Operate time delay when
disconnecting all three phases
Time delay to block when all
three phase voltages are not
low
ABB
SEMOD166919-2 v6
Range or value
UBase
(2.0–100.0) % of
UBase
(1.0–100.0) % of
(0.000–60.000)s
(0.000–60.000)s
(0.000–60.000)s
SEMOD175210-2 v6
Range or value
(1–100)% of UBase
(0.050–60.000) s
(0.000–60.000) s
(0.000–60.000) s
(0.000–60.000) s
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
±0.5% of U
r
±0.2% or ±15 ms whichever is greater
±0.2% or ±35 ms whichever is greater
±0.2% or ±35 ms whichever is greater
±0.2% or ±35 ms whichever is greater
1MRK 504 155-BEN F
89