ABB RELION REB500 Technical Manual page 71

1MRK 505 406-UEN B
IEC19000418 V1 EN-US
Figure 17:
The measurement has to be performed using the negative-sequence component, whenever
there is no source of residual current behind the relay, that is, no grounded transformer
neutrals. The parameter
The zero and/or negative-sequence components of currents and voltages are compared with
the settings of the parameters:
• U
0min
• I
0min
• U
2min
• I
2min
• the associated binary signals U
The signals U
result of discrepancies between the operating times of the three circuit-breaker poles.
Depending on the operating mode selected, one of the following four conditions is monitored:
Bay protection functions REB500
Technical manual
VT supervision
VTSupMode (operating mode) must be set accordingly.
VTSup [U0_VTSUP]
VTSup [I0_VTSUP]
VTSup [U2_VTSUP]
VTSup [I2_VTSUP]
and U are delayed by 5 ms as a precaution against incorrect blocking as a
0 2
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, U , I and I are then set to logical
0 2 0 2
Bay protection functions
18000016-IEC19000418-1-en.vsdx
1 or left at logical 0 .
Section 5
65