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6 F 2 S 0 8 3 5
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 [TPMODE],
[ARC-M], and [STUB]. The switch [TPMODE] is valid for model 100s.
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.
Out-of-step tripping
Set the scheme switch [OST] to "Trip".
Shift the phase angle from the second quadrant to the third quadrant or vice versa taking the
remote terminal voltage as a reference voltage.
Check that the tripping output relay operates in all phases and autoreclose does not start.
Check that the indications and recordings are correct.
Shift the phase angle from the first quadrant to the fourth quadrant or vice versa taking the
remote terminal voltage as a reference voltage.
Check that any of the tripping output relays do not operate.
Circuit breaker failure tripping
Set the scheme switch [BF1] to "T" or "TOC" and [BF2] to "ON".
Apply a fault and retain it. Check that the adjacent breaker tripping output relay operates after the
time setting of the TBF2.
The adjacent breaker tripping output relay is user configurable and assigned to signal
CBF-TRIP. For the setting, see Sections 4.2.6.9 and 4.2.7.2.
⎯ 211 ⎯
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