1.
Check the input circuits and the operate value of the
IMinOp current level detector by
injecting current, one phase at a time.
2.
Check the phase current blocking function for all three phases by injecting current, one
phase at a time. The output signals shall reset with a delay of 1 second when the current
exceeds 1.5 ·
IBase.
3.
Inject a current 0.1 ·
IBase to the reference current input I5.
4.
Increase slowly the current in one of the phases current input and check that FAIL output
is obtained when the current is about 0.9 ·
IBase.
12.9.1.2
Completing the test
M12917-43 v4
Continue to test another function or end the test by changing the
TestMode setting to Off.
Restore connections and settings to their original values, if they were changed for testing
purposes.
12.9.2
Fuse failure supervision FUFSPVC
M1405-2 v8
Prepare the IED for verification of settings as outlined in section
and
in this chapter.
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.
12.9.2.1
Checking that the binary inputs and outputs operate as expected
M1405-9 v8
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.
•
The signal BLKU should appear with almost no time delay.
•
The signals BLKZ and 3PH should not appear on the IED.
•
Only the distance protection function can operate.
•
Undervoltage-dependent functions must not operate.
3.
Disconnect the dc voltage from the DISCPOS binary input terminal.
4.
Connect the nominal dc voltage to the MCBOP binary input.
•
The BLKUand 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.
BLKU and BLKZ signals should appear simultaneously wether the BLKU 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 BLKU 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 BLKU after about 50ms
•
Signal BLKZ after about 200ms
Section 12
1MRK 502 067-UEN B
Testing functionality by secondary injection
200
Commissioning manual
