ABB RELION REB500 Technical Manual page 63
Bay protection functions
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Also See for RELION REB500:
- Operation manual (110 pages) ,
- Applications manual (108 pages) ,
- Engineering manual (98 pages)
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1MRK 505 406-UEN B
Phase selection
The phase selection logic determines the loop:
•
for the underimpedance starting measurement when an ground fault has been detected
•
to be measured in the first period (max. 20 ms) after starting
•
to be measured during the time the function is in the picked-up state when a ground fault
has been detected on an ungrounded system or system with Petersen coils (phase
selection ≠ solidly grounded)
In a solidly grounded system (parameter
measured is determined according to the following table:
Table 48: Solidly grounded system- loop to be measured
Type of fault
Phase-to-ground fault
Phase-to-ground fault
Phase-to-ground fault
Phase-to-phase fault
Phase-to-phase fault
Phase-to-phase fault
Phase-to-phase-to-ground fault
Phase-to-phase-to-ground fault
Phase-to-phase-to-ground fault
Three-phase fault
In a solidly grounded system, both phases involved in a phase-to-phase-to-ground fault have
to trip, which is not the case in ungrounded systems or systems with Petersen coils. The
phase-to-phase loops are measured.
In ungrounded systems or systems with Petersen coils (parameter
acyclic phase selection), the loop to be measured is determined according to the following
table:
Table 49: Ungrounded system or Peterson coil - loop to be measured
Type of fault
Phase-to-phase fault
Phase-to-phase fault
Phase-to-phase fault
Three-phase fault
Cross-country fault *)
Cross-country fault *)
Cross-country fault *)
*) two ground faults at different locations
In ungrounded systems or systems with Petersen coils, it is usual for just one of the two
ground faults of a cross-country fault to be tripped, so that as much of the system remains in
operation as possible.
Bay protection functions REB500
Technical manual
PhaseSelMode set to solid gr. ), the loop to be
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GUID-F5513F63-3A6F-4981-AF34-6B92F2828581 v1
Starters
Loop measured
L1, E
L2, E
L3, E
L1, L2
L2, L3
L3, L1
L1, L2, E
L2, L3, E
L3, L1, E
L1, L2, L3
PhaseSelMode set to cyclic/
Starters
Loop measured
L1, L2
L2, L3
L3, L1
L1, L2, L3
L1, L2, E
L2, L3, E
L3, L1, E
Section 5
Bay protection functions
L1E
L2E
L3E
L1L2
L2L3
L3R
L1L2
L2L3
L3L1
L3L1 (L1L2) (L2L3)
L1L2
L2L3
L3L1
L3L1 (L1L2) (L2L3)
according to phase
selection logic
57
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