Testing The Power Swing Detection Function Zmrpsb (68) - ABB RET670 Commissioning Manual

Section 10
Testing functionality by secondary injection
1. Keep the measured current as close as possible to its rated value or lower. Keep it constant
during the test, but ensure that it is higher than the set minimum operating current.
2. Ensure that the maximum continuous current to the IED does not exceed four times its rated
value, if the measurement of the operating characteristics runs under constant voltage
conditions.
3. Make the necessary connections and settings of the test equipment for test of point 1
according to figure 28.
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 28.
10.4.9.2

Testing the power swing detection function ZMRPSB (68)

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 PICKUP, power swing detection.
1. Slowly decrease the measured impedance in all three phases until the PICKUP 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
4. The PICKUP signal must not appear.
5. Increase the measured voltages to their rated values.
10.4.9.3 Testing the
Preconditions
• The input I0CHECK, residual current (3I
configured to the output signal PHG_FLT on the FDPSPDIS (21) or FRPSPDIS (21) function.
• The input BLK_SS, block inhibit of the pickup output for subsequent residual current
detection is connected to FALSE.
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
3. Start the sequence and observe that the PICKUP signal will not be activated.
110
tR1 timer
R1LIn at the predefined test current.
) detection used to inhibit the pickup output must be
0
tR1 has elapsed.
1MRK 504 154-UUS B
4 and step 5
M13888-27 v6
M13888-47 v8
Commissioning manual