4.
Decrease the measured three-phase impedance slowly and observe the operation value
for the signal ZOUT.
5.
Compare the operation value with the set value.
6.
Do the necessary change of the setting of the test equipment and repeat step
for point 2, 3 and 4 according to figure
12.4.9.2
Testing the power swing detection function ZMRPSB
M13888-27 v6
Preconditions
The following output signals shall be configured to binary outputs: ZOUT, measured
impedance within outer impedance boundary, ZIN, measured impedance within inner
impedance boundary and START, power swing detection.
1.
Slowly decrease the measured impedance in all three phases until the START signal gets
activated.
2.
Increase the measured voltages to their rated values.
3.
Decrease instantaneously voltages in all three phases to the values, which are
approximately 20% lower than the voltage that gives the set value
R1LIn at the
predefined test current.
4.
The START signal must not appear.
5.
Increase the measured voltages to their rated values.
12.4.9.3
Testing the
tR1 timer
M13888-47 v8
Preconditions
•
The input I0CHECK, residual current (3I
0
) detection used to inhibit the start output must
be configured to the output signal STPE on the FDPSPDIS or FRPSPDIS function.
•
The input BLKI02, block inhibit of the start output for subsequent residual current
detection is connected to FALSE.
1.
Program the test equipment for a single-phase to earth fault and energize FDPSPDIS or
FRPSDIS and check that the input BLOCK on the power swing detection function ZMRPSB
is activated.
2.
Make a test sequence so that a single-phase to earth fault occurs after that the trajectory
of the impedance has passed the outer and inner boundary of ZMRPSB during power
swing. Use the result from test of ZMRPSB above to determine when the fault shall be
applied. The earth-fault must be activated before
tR1 has elapsed.
3.
Start the sequence and observe that the START signal will not be activated.
12.4.9.4
Testing the block input, interaction between FDPSPDIS or FRPSPDIS and
ZMRPSB
M13888-73 v7
Precondition
The BLOCK input is configured and connected to STPE output on the FDPSPDIS or FRPSPDIS
function.
1.
Make a test sequence so that a single phase-to-earth-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. Use the result from test of ZMRPSB
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 START.
Section 12
1MRK 502 067-UEN B
Testing functionality by secondary injection
128
Commissioning manual