ABB REG650 Product Manual page 39

Generator protection REG650
Product version: 1.3
Differential protection
Table 23. Transformer differential protection T2WPDIF, T3WPDIF
Function
Operating characteristic
Reset ratio
Unrestrained differential current limit
Base sensitivity function
Minimum negative sequence current
Operate angle, negative sequence
Second harmonic blocking
Fifth harmonic blocking
Connection type for each of the windings
Phase displacement between high voltage
winding, W1 and each of the windings, W2
and W3. Hour notation
Operate time, restrained function
Reset time, restrained function
Operate time, unrestrained function
Reset time, unrestrained function
Table 24. Restricted earth-fault protection, low impedance REFPDIF
Function
Operate characteristic
Reset ratio
Directional characteristic, for zero
sequence directional function
Operate time, trip function
Reset time, trip function
ABB
Range or value
Adaptable
>94%
IBase on
(1.00-50.00)x
high voltage winding
IBase
(0.05 - 0.60) x
(0.02 - 0.20) x IBase
(30.0 - 90.0) degrees
(5.0-100.0)% of
fundamental differential
current
(5.0-100.0)% of
fundamental differential
current
Y or D
0–11
25 ms typically at 0 to 5 x
set level
25 ms typically at 5 to 0 x
set level
20 ms typically at 0 to 5 x
set level
25 ms typically at 5 to 0 x
set level
Range or value
Adaptable
0.95
ROA ± 60 to ± 90 degrees
25 ms typically at 0 to 10 x IdMin
30 ms typically at 10 to 0 x IdMin
Accuracy
± 1.0% of Ir for I < Ir
± 1.0% of I for I > Ir
-
± 1.0% of set value
± 1.0% of Ir
± 1.0% of Ir
± 1.0 degrees
± 2.0% of applied harmonic magnitude
± 12.0% of applied harmonic magnitude
-
-
-
-
-
-
Accuracy
± 1% of IBase if Ibias < 1.25 IBase (i.e. base sensitivity in section 1 of the
operate - restrain characteristic)
± 2% of theoretical operate value (Idiff) if Ibias >= 1.25 IBase (i.e. sections
2 and 3)
(The above is valid if IBase is equal to the protected winding rated current.)
-
± 1 degrees at Ibias = IBase
± 2 degrees at Ibias = 2 * IBase
± 3 degrees at Ibias = 4 * IBase
(The above is valid if IBase is equal to the protected winding rated current.)
-
-
1MRK 502 050-BEN B
39