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
37.
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
4
and step 5 for point 2, 3 and 4 according to figure 37.
11.4.9.2 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.
11.4.9.3 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
1MRK 505 378-UEN A Section 11
Testing functionality by secondary injection
Line differential protection RED670 2.2 IEC 143
Commissioning manual
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