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Section 7
Testing functionality
7.8
Testing secondary system supervision functions
7.8.1
Fuse failure supervision SDDRFUF
Prepare the IED for verification of settings as outlined in
settings".
Values of the logical signals for SDDRFUF are available on the local HMI under Main menu/
Tests/Function status/Secondary system supervision/SDDRFUF/1:SDDRFUF. The Signal
Monitoring in PCM600 shows the same signals that are available on the local HMI.
The verification is divided in two main parts. The first part is common to all fuse failure
supervision options, and checks that binary inputs and outputs operate as expected according
to actual configuration. In the second part the relevant set operate values are measured.
7.8.1.1
Checking that the binary inputs and outputs operate as expected
1.
Simulate normal operating conditions with the three-phase currents in phase with their
corresponding phase voltages and with all of them equal to their rated values.
2.
Connect the nominal dc voltage to the DISCPOS binary input.
•
•
•
•
3.
Disconnect the dc voltage from the DISCPOS binary input terminal.
4.
Connect the nominal dc voltage to the MCBOP binary input.
•
•
5.
Disconnect the dc voltage from the MCBOP binary input terminal.
6.
Disconnect one of the phase voltages and observe the logical output signals on the
binary outputs of the IED. BLKU and BLKZ signals should simultaneously appear.
BLKU and BLKZ signals should simultaneously appear.
7.
After more than 5 seconds disconnect the remaining two-phase voltages and all three
currents.
•
•
8.
Establish normal voltage and current operating conditions simultaneously and observe
the corresponding output signals.
They should change to logical 0 as follows:
•
•
•
7.8.1.2
Measuring the operate value for the negative sequence function
Measure the operate value for the negative sequence function.
1.
Simulate normal operating conditions with the three-phase currents in phase with their
corresponding phase voltages and with all of them equal to their rated values.
2.
Slowly decrease the measured voltage in one phase until the BLKU signal appears.
3.
Record the measured voltage and calculate the corresponding negative-sequence voltage
according to the equation.
74
The signal BLKU should appear with almost no time delay.
No signals BLKZ and 3PH should appear on the IED.
Only the distance protection function can operate.
Undervoltage-dependent functions must not operate.
The BLKU and BLKZ signals should appear without any time delay.
All undervoltage-dependent functions must be blocked.
There should be no change in the high status of the output signals BLKU and BLKZ.
The signal 3PH will appear.
Signal 3PH after about 25ms
Signal BLKU after about 50ms
Signal BLKZ after about 200ms
© Copyright 2011 ABB. All rights reserved
1MRK 502 035-UEN A
6.1"Preparing the IED to verify
Generator protection REG650
Commissioning manual
M1405-2 v6
M1405-9 v5
M1405-46 v5
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