ABB Relion 670 Series Commissioning Manual page 88

Section 10
Testing functionality by secondary injection
10.4.5 Thermal overload protection, two time constants TRPTTR (49)
Prepare the IED for verification of settings as outlined in section
for test" in this chapter.
10.4.5.1 Checking trip 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 trip value of stage IBase1,
increase the current in phase A until stage IBase1 trips and note the trip value.
4. Decrease the current slowly and note the reset value.
Check, in the same way, the trip and reset values of IBase1 for phases B and C.
5. Activate the cooling input signal, thus switching to base current IBase2.
6. Check the trip and reset values (for all three phases) for IBase2 in the same way as described
above for stage IBase1.
7. Deactivate the input signal for stage IBase2.
8. Set the time constant for IBase1 in accordance with the setting plan.
9. Set the injection current for phase A to 1.50 · IBase1.
10. Connect a trip output contact to the timer and monitor the output of contacts ALARM1 and ALARM2
to digital inputs in test equipment.
Read the heat content in the thermal protection from the local HMI and wait until the content is
zero.
11. Switch on the injection current and check that ALARM1 and ALARM2 contacts trip at the set
percentage level and that the trip time for tripping is in accordance with the set Time Constant 1
(Tau1).
With setting Itr = 101%IBase1 and injection current 1.50 · IBase1, the trip time from zero content in
the memory shall be 0.60 · Time Constant 1 (Tau1).
12. Check that all trip and alarm contacts trip according to the configuration logic.
13. Switch off the injection current and check from the service menu readings of thermal status and
LOCKOUT that the lockout resets at the set percentage of heat content.
14. Activate the cooling input signal to switch over to base current IBase2.
Wait 5 minutes to empty the thermal memory and set Time Constant 2 (Tau2) in accordance with
the setting plan.
15. Test with injection current 1.50 · IBase2 the thermal alarm level, the trip time for tripping and the
lockout reset in the same way as described for stage IBase1.
16. Finally check that pickup and trip information is stored in the event menu.
10.4.5.2 Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Disabled.
Restore connections and settings to the original values, if changed for testing purposes.
82
Observe the maximum permitted overloading of the current circuits in the IED.
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1MRK 505 372-UUS Rev. K
"Requirements" and section
Busbar protection REB670
Commissioning manual
SEMOD53632-3 v5
"Preparing
SEMOD53632-11 v7
SEMOD53632-51 v5