13.5.15 Generator stator overload protection GSPTTR (49S)
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13.5.15.1 Verifying the settings
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Explained testing method is given for default value for the TD1 parameter.
The function has heating content memory features. Thus if testing shots are done
consecutively, operate time will be shorten accordingly, compared to the given operate
characteristic. Therefore either wait until set tReset time has elapsed, between two
shots, or reset this memory by setting the RESET input into the function to value
TRUE
1. Connect the test set for the appropriate three-phase current injection to the IED
phases A, B and C. The protection shall be fed with a symmetrical three-phase
current.
2. Set the injected current to 116% of IBase, switch on the current and check operate
time of the trip, 120 s.
3. Decrease the current slowly.
4. The output signal PICKUP will reset if the measured current falls below reset
level or if BLOCK signal is set to one.
5. Switch off the current.
6. Set the injected current to 120% of IBase, switch on the current and check operate
time of the trip, 60 s.
7. Switch off the current.
8. Set the injected current to 154% of IBase, switch on the current and check operate
time of the trip, 30 s.
9. Switch off the current.
10. Set the injected current to 226% of IBase, switch on the current and check operate
time of the trip, 10 s.
11. Switch off the current.
12. Finally check that pickup and trip information is stored in the event menu.
13.5.15.2 Completing the test
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Continue to test another function or end the test by changing the Test mode setting to
Disabled. Restore connections and settings to their original values, if they were
changed for testing purposes. Make sure that all built-in features for this function,
which shall be in operation, are enabled and with correct settings.
1MRK 502 073-UUS A Section 13
Testing functionality by secondary injection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 217
Commissioning manual
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