Verifying The Signals And Settings; Completing The Test - Hitachi RET670 Commissioning Manual

Section 11
Testing functionality by secondary injection
Document
revision
D
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11.4.14.2

Verifying the signals and settings

The Phase preference logic function PPLPHIZ is tested with a three-phase testing equipment for
distance protections. PPLPHIZ is tested in co-operation with the Distance protection zone,
quadrilateral characteristic function ZMQPDIS. The distance protection and the phase preference
logic shall be set to values according to the real set values to be used. The test is made by means of
injection of voltage and current where the amplitude of both current and voltage and the phase angle
between the voltage and current can be controlled.
During the test the following binary signals (outputs) shall be monitored:
• Trip signal from distance protection
• Start signal from phase preference logic
1. Connect the test set for injection of voltage and current.
2. Inject voltages and currents corresponding to a phase-to-phase to earth fault within zone 1 of
the distance protection function. In the test one of the current inputs (one of the faulted phases)
is disconnected. The remaining current is the fault current out on the protected line. All
combinations of two phase-to-earth faults with one phase current are tested. The result shall be
according to
phase-to-earth voltage, zero-sequence voltage and phase current so that the conditions set for
the logic are fulfilled.
Table 36:
OperMode
No Filter
No Pref
1231c
1321c
123a
132a
213a
231a
312a
321a
11.4.14.3

Completing the test

Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
154
Product History
revision
2.2.3 -
2.2.3 -
2.2.4 -
2.2.4 Setting ranges and setting descriptions have been updated in order to make the function
more user friendly. The added logic takes over if the relay detects the two faulty phases
within 20 ms and allows a larger margin of undervoltage to detect the faulty phases.
2.2.5 -
Table 36. It should be checked that the fault will give phase-to-phase voltage,
Operation at different combinations of faults and operation mode
Fault type/Faulted phase current to the IED
L1L2N/IL1 L1L2N/IL2
Trip Trip
Trip Trip
Trip No Trip
No Trip Trip
Trip No Trip
Trip No Trip
No Trip Trip
No Trip Trip
Trip No Trip
No Trip Trip
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L2L3N/IL2 L2L3N/IL3 L3L1N/IL1
Trip Trip
Trip Trip
Trip No Trip
No Trip Trip
Trip No Trip
No Trip Trip
Trip No Trip
Trip No Trip
No Trip Trip
No Trip Trip
1MRK 504 165-UEN Rev. K
GUID-F84417C1-0C2B-48E3-AE1D-F6F07F98F76A v1
L3L1N/IL3
Trip Trip
Trip Trip
No Trip Trip
Trip No Trip
Trip No Trip
Trip No Trip
Trip No Trip
No Trip Trip
No Trip Trip
No Trip Trip
GUID-8BD66BC8-AAC3-41C4-B819-B159361688D2 v5
Transformer protection RET670
Commissioning manual