Completing The Test - ABB Relion 670 Series REL670 Commissioning Manual

Line distance protection 2.1 iec

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Section 10

Testing functionality by secondary injection

10.4.14.1

144

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

Connect the test set for injection of voltage and current.

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 table 31.

It should be checked that the fault will give phase-to-phase voltage, phase-to-

earth voltage, zero-sequence voltage and phase current so that the conditions set

for the logic are fulfilled.

Table 31:

Operation at different combinations of faults and operation mode

OperMode

Fault type/Faulted phase current to the IED

L1L2N/IL1

No Filter

Trip

No Pref

Trip

1231c

Trip

1321c

No Trip

123a

Trip

132a

Trip

213a

No Trip

231a

No Trip

312a

Trip

321a

No Trip