• The BLKVand 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
13.9.2.2 Measuring the trip value for the negative sequence function
M1405-46 v12
Measure the trip value for the negative sequence function, if included in the IED.
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 BLKV signal
appears.
3. Record the measured voltage and calculate the corresponding negative-sequence
voltage according to the equation (observe that the voltages in the equation are
phasors):
Section 13 1MRK 502 073-UUS A
Testing functionality by secondary injection
242 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Commissioning manual
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