ABB RELION RET670, Руководство по эксплуатации продукта

Страница: 51 / 102

Differential protection
Table 23. Transformer differential protection T2WPDIF, T3WPDIF
Function Range or value Accuracy
Operating characteristic Adaptable ± 2.0% of Ir for I < Ir
± 2.0% of Ir for I > Ir
Reset ratio > 95% -
Unrestrained differential current
limit (100-5000)% of
IBase on high
voltage winding ± 2.0% of set value
Base sensitivity function (10-60)% of IBase ± 2.0% of Ir
Second harmonic blocking (5.0-100.0)% of
fundamental ± 2.0% of Ir
Fifth harmonic blocking (5.0-100.0)% of
fundamental ± 5.0% of Ir
Connection type for each of the
windings Y or D -
Phase displacement between high
voltage winding, W1 and each of
the windings, W2 and W3. Hour
notation 0–11 -
Operate time, restrained function 25 ms typically at
0 to 2 x Id -
Reset time, restrained function 20 ms typically at
2 to 0 x Id -
Operate time, unrestrained
function 12 ms typically at
0 to 5 x Id -
Reset time, unrestrained function 25 ms typically at
5 to 0 x Id -
Critical impulse time 2 ms typically at 0
to 5 x Id -
Transformer protection RET670 1MRK 504 091-BEN B
Pre-configured
Product version: 1.1
Issued: June 2010
ABB 51