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Section 6
Testing functionality
6.9.5.1
132
Values of the logical signals for ECPSCH (85) are available on the local HMI under
Main menu/Tests/Function status/Scheme communication/ECPSCH(85)/
1:ECPSCH. The Signal Monitoring in PCM600 shows the same signals that are
available on the local HMI.
Before testing the communication logic for residual overcurrent protection function
ECPSCH (85), the four step residual overcurrent protection function EF4PTOC (51N/
67N) has to be tested according to the corresponding instruction. Once this is done,
continue with the instructions below.
If the current reversal and weak-end infeed logic for ground-fault protection is
included, proceed with the testing according to the corresponding instruction after the
testing the communication logic for residual overcurrent protection. The current
reversal and weak-end-infeed functions shall be tested together with the permissive
scheme.
Testing the directional comparison logic function
Blocking scheme
1.
Inject the polarizing voltage 3V0 at 5% ofVBase where the current is lagging the
voltage by 65°.
2.
Inject current (65° lagging the voltage) in one phase at about 110% of the set
operating current, and switch the current off with the switch.
3.
Switch the fault current on and measure the operating time of the communication
logic.
Use the TRIP signal from the configured binary output to stop the timer.
4.
Compare the measured time with the set value tCoord.
5.
Activate the CR binary input.
6.
Check that the CRL output is activated when the CR input is activated.
7.
Switch the fault current on (110% of the set operating current) and wait longer
than the set value tCoord.
No TRIP signal should appear.
8.
Switch the fault current off.
9.
Reset the CR binary input.
10. Activate the BLOCK digital input.
11. Switch the fault current on (110% of the set operating current) and wait for a
period longer than the set value tCoord.
1MRK 506 331-UUS A
Commissioning Manual
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