ABB Relion 650 series RET650 Product Manual page 49

ABB
Transformer protection RET650
Product version: 1.1
Table 22. Restricted earth fault protection, low impedance REFPDIF
Function
Operate characteristic
Reset ratio
Base sensitivity function
Directional characteristic,
for zero sequence
directional function
Operate time, trip function 25 ms typically at 0 to 10
Reset time, trip function
Table 23. 1Ph High impedance differential protection HZPDIF
Function
Operate voltage
Reset ratio
Maximum continuous voltage U>Trip
Operate time
Reset time
Critical impulse time
Range or value
Adaptable
>95%
(4.0-100.0)% of IBase
(60 - 90) degrees
x IdMin
30 ms typically at 10 to 0
x IdMin
Range or value
(20-400) V
I=U/R
>95%
2
/series resistor ≤200 W
15 ms typically at 0 to 10 x U
90 ms typically at 10 to 0 x U
2 ms typically at 0 to 10 x U
1MRK 504 127-BEN -
Issued: February 2011
Accuracy
± 1.0% of Ir for I < Ir
r
± 1.0% of I for I > Ir
-
± 1.0% of I
r
± 2.0 degree
-
-
Accuracy
± 1.0% of I
r
-
-
-
d
-
d
-
d
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