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1MRK 504 160-UEN -
10.4.4.2
10.4.4.3
10.4.5
10.4.5.1
Transformer protection RET650 2.1 IEC
Commissioning manual
Testing functionality by secondary injection
7.
Connect a trip output contact to a timer.
8.
Set the injected current to 200% of the operate level of the tested step, switch on
the current and check the time delay.
For inverse time curves, check the operate time at a current equal to 110% of the
operate current for txMin.
9.
Check that all operate and start contacts operate according to the configuration
(signal matrixes)
10. Reverse the direction of the injected current and check that the step does not
operate.
11. Check that the protection does not operate when the polarizing voltage is zero.
12. Repeat the above described tests for the higher set steps.
13. Finally, check that start and trip information is stored in the event menu.
Four step non-directional earth fault protection
1.
Do as described in
applying any polarizing voltage.
Completing the test
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.
Thermal overload protection, two time constants TRPTTR
Prepare the IED for verification of settings outlined in section
verify
settings".
Checking operate and reset values
1.
Connect symmetrical three-phase currents to the appropriate current terminals
of the IED.
2.
Set the Time constant 1 (Tau1) and Time Constant 2 (Tau2) temporarily to 1
minute.
3.
Set the three-phase injection currents slightly lower than the set operate value of
stage IBase1, increase the current in phase L1 until stage IBase1operates and
note the operate value.
Observe the maximum permitted overloading of the current
circuits in the IED.
4.
Decrease the current slowly and note the reset value.
"Four step directional earth fault
Section 10
protection", but without
"Preparing the IED to
75
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