Values of the logical signals for SDDRFUF are available on the local HMI under Main
menu/Tests/Function status/Secondary system supervision/SDDRFUF/SDDRFUF:
1. 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.
6.6.2.1 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 89bS binary input.
• The signal BLKV 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.
3. Disconnect the dc voltage from the 89b binary input terminal.
4. Connect the nominal dc voltage to the MCBOP binary input.
• The BLKV and BLKZ signals should appear without any time delay.
• All undervoltage-dependent functions must be blocked.
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.
BLKV and BLKZ signals should appear simultaneously wether the BLKV and
BLKZ reset depends on the setting SealIn “on” or “off”. If “on” no reset, if “off”
reset.
7. After more than 5 seconds disconnect the remaining two-phase voltages and all three
currents.
• There should be no change in the high status of the output signals BLKV and
BLKZ.
• The signal 3PH will appear.
8. Establish normal voltage and current operating conditions simultaneously and
observe the corresponding output signals.
They should change to logical 0 as follows:
• Signal 3PH after about 25ms
• Signal BLKV after about 50ms
• Signal BLKZ after about 200ms
1MRK 505 293-UUS A Section 6
Testing functionality
87
Commissioning manual
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