ABB RELION RET670, Commissioning Manual

Page: 151 / 328

1. Program the test equipment for a single-phase to ground fault and energize
FDPSPDIS (21) or FRPSDIS (21) and check that the input BLOCK on the power
swing detection function ZMRPSB (68) is activated.
2. Make a test sequence so that a single-phase to ground fault occurs after that the
trajectory of the impedance has passed the outer and inner boundary of ZMRPSB
(68) during power swing. Use the result from test of ZMRPSB (68) above to
determine when the fault shall be applied. The ground-fault must be activated before
tR1 has elapsed.
3. Start the sequence and observe that the PICKUP signal will not be activated.
11.4.9.4 Testing the block input, interaction between FDPSPDIS (21) or FRPSPDIS
(21) and ZMRPSB (78)
Precondition
The BLOCK input is configured and connected to PHG_FLT output on the FDPSPDIS
(21) or FRPSPDIS (21) function.
1. Make a test sequence so that a single phase-to-ground-fault occurs after that the
trajectory of the impedance has passed the outer boundary but not the inner boundary
of the power swing detection function ZMRPSB (68). Use the result from test of
ZMRPSB (68) above to instance when the fault shall be applied.
2. Start the test sequence by continuously reducing the voltage and observe that the
output signal ZOUT may come, but not PICKUP.
If the input I0CHECK is configured (connected to output signal PHG_FLT on
FDPSPDIS (21) or FRPSPDIS (21), the test of inhibit of ZMRPSB (68) at ground-
fault during power swing can be done in the same way as for test of
tR1 . The inhibit
of ZMRPSB (68) shall be instantaneous if the input TRSP is activated at the same
time as the input I0CHECK during power swing.
11.4.9.5 Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to
Disabled . Restore connections and settings to their original values, if they were changed
for testing purposes.
11.4.10 Power swing logic PSLPSCH
Prepare the IED for verification of settings as outlined in section "Requirements" and
section "Preparing for test" in this chapter.
Most readily available test equipment does not permit simulation of power-swing
conditions and the simultaneous occurrence of different faults with controlled fault
1MRK 504 165-UUS -
Section 11
Testing functionality by secondary injection
Transformer protection RET670 2.2 ANSI 145
Commissioning manual