11.4.14.1 Function revision history
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Document
revision
Product
revision
History
A 2.2.1 -
B 2.2.1 -
C 2.2.2 -
D 2.2.3 -
E 2.2.3 -
F 2.2.4 -
G 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.
H 2.2.5 -
11.4.14.2 Verifying the signals and settings
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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 (21). 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
• Trip 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 ground 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-ground faults with one phase current are tested. The result shall be according to
Table
36. It should be checked that the fault will give phase-to-phase voltage, phase-to-ground voltage,
zero-sequence voltage and phase current so that the conditions set for the logic are fulfilled.
Table 36: Operation at different combinations of faults and operation mode
OperMode
Fault type/Faulted phase current to the IED
A_BG/IA A_BG/IB B_CG/IB B_CG/IC C_CG/IA C_AG/IC
No Filter Trip Trip Trip Trip Trip Trip
No Pref Trip Trip Trip Trip Trip Trip
1231c Trip No Trip Trip No Trip No Trip Trip
1321c No Trip Trip No Trip Trip Trip No Trip
123a Trip No Trip Trip No Trip Trip No Trip
132a Trip No Trip No Trip Trip Trip No Trip
213a No Trip Trip Trip No Trip Trip No Trip
Table continues on next page
Section 11 1MRK 504 165-UUS Rev. J
Testing functionality by secondary injection
162 Transformer protection RET670
Commissioning manual
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