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6 F 2 S 0 8 5 0
6.5.3
Protection Scheme
Protection schemes implemented in GRL100 are basically for unit protection. It is recommended
that the protection schemes are tested under end-to-end mode. The setup of the end-to-end
synchronized test is described in Section 6.5.1.
In the protection scheme tests, a dynamic test set with the three-phase voltage source and current
source is required to simulate power system pre-fault, fault and post-fault conditions.
The "Sim.fault" on the LCD "Test" menu is available to test local and remote terminals
synchronously. For use, see Section 4.2.7.5
The autoreclose function can be tested together with these tests. A permanent fault should be
applied to test a reclose-onto-fault.
Tripping is observed with the tripping command output relays TP-A1 to -C1 and TP-A2 to -C2.
Reclosing is observed with the user configurable reclosing command output relays assigned to
signals ARC1 and ARC2. For the default setting, see Appendix D.
Differential tripping
When a phase current is applied, instantaneous per phase based tripping or three-phase tripping
is performed depending on the fault types, setting of the scheme switches [ARC-M], and
[STUB].
The tripping should be checked for the current which is two times or larger than the minimum
operating current DIFI1 or DIFGI. Operating time is measured by the operating time of the
tripping command output relay. It will typically be 1 cycle.
Check that the indications and recordings are correct.
When a residual current is applied, time-delayed three-phase tripping is performed. Operating
time will be 1 cycle plus setting of timer TDIFG. The tripping or reclosing is blocked when the
scheme switch [DIFG] or [ARC-DIFG] is set to "OFF".
Check that the indications and recordings are correct.
Zone 1 tripping
This performs instantaneous or time-delayed, and single-phase or three-phase tripping
depending on the fault types, setting of trip mode control switch [Z1CNT] and autoreclose mode
switch [ARC-M].
Zone 1 tripping should be checked for the fault at 50% of the zone 1 reach setting.
Operating time is measured on operation of the trip output relay. It will typically be 1 cycle in
case of instantaneous tripping.
Check that the indications and recordings are correct.
Zone 2 tripping
Check that three-phase time-delayed final tripping is performed for all kinds of faults. Faults
should be set midway between zone 1 and zone 2.
Check that the operating time is 1-1.5 cycle plus zone 2 timer setting.
Check that the indications and recordings are correct.
Zone 3 tripping
Check that three-phase time-delayed final tripping is performed for all kinds of faults. Faults
should be set midway between zone 2 and zone 3.
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