11.9.2.6 Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to
Disabled. Restore connections and settings to their original values, if they were changed
for testing purposes.
11.9.3 Fuse failure supervision
Prepare the IED for verification of settings outlined in Section
"Preparing the IED to
verify settings".
Checking the operation of binary input and output
1. Simulate normal operation conditions with three-phase voltage on the main fuse
group and the pilot fuse group. Ensure the values are equal to their rated values.
2. Disconnect one of the phase voltage from the main fuse group or the pilot fuse group.
Observe the binary outputs of the IED. The MAINFUF or the PILOTFUF signals are
simultaneously activated. Only the output circuit related to the open phase will be
active i.e either MAINFUF or PILOTFUF.
3. Establish a normal voltage operating condition and observe the corresponding output
signals. MAINFUF or PILOTFUF should change to 0 in about 27 ms.
4. Set normal conditions as mentioned in step 1.
5. Enable the BLOCK binary input and repeat step 2. MAINFUF or PILOTFUF should
not appear.
Checking the operation of MAINFUF and PILOTFUF
1. Simulate normal operation conditions with three-phase voltage on the main fuse
group and the pilot fuse group. Ensure the values are equal to their rated values.
2. Decrease one of the three-phase voltages on main fuse group or pilot fuse group. The
voltage change must be greater than the set value for Vdif Main block or Vdif Pilot
alarm. MAINFUF or PILOTFUF signals are activated without any time delay.
3. Set normal conditions as mentioned in step 1. MAINFUF or PILOTFUF signals
should reset.
4. Set SealIn to On, Vdif Main block to 20% of VBase and VSealIn to 70% of VBase.
5. Apply three-phase voltages with the value slightly below VSealIn level.
6. Decrease one of the three-phase voltages on main fuse group. The voltage change
must be greater than the set value for Vdif Main block. MAINFUF signal is activated.
7. After more than 5 seconds increase the measured voltage back to the value slightly
below VSealIn level. MAINFUF signal should not reset.
8. Slowly increase measured voltage to the value slightly above VSealIn until
MAINFUF signal resets.
9. Record the measured voltage and compare with the set value VSealIn.
1MRK 504 165-UUS - Section 11
Testing functionality by secondary injection
Transformer protection RET670 2.2 ANSI 235
Commissioning manual
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