Hitachi Relion 670 Series Commissioning Manual page 152

Section 11
Testing functionality by secondary injection
11.4.14 Phase preference logic PPLPHIZ
Prepare the IED for verification of settings outlined in Section
11.4.14.1 Function revision history
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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 (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
37. 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.
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Product History
revision
2.2.1 -
2.2.1 -
2.2.2 -
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 -
2.2.6 -
2.2.6 A feature has been added which can enable opening of a preferred phase-to-ground loop for
cross-country faults having very low residual current at IED location (for example, when both
faults are in front of the IED).
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"Preparing the IED to verify
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Line distance protection REL670
Commissioning manual
settings".
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