13.5.16 Generator rotor overload protection (49R)
GUID-4BEA4A9E-AEE1-4E4E-9D7C-ABA3499EB431 v1
13.5.16.1 Verifying the settings
GUID-2AF96028-B49E-4820-BD3D-4957E75B9C2D v2
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 shortened 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.
Precautions if MeasurCurrent = DC. The magnitude of the injected current have to be
decreased by multiplying it with a factor of 0.741 in order to get correct operate times
when testing with three-phase symmetrical sinusoidal currents.
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 113% 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 125% 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 146% 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 209% of IBase, switch on the current and check operate
time of the trip, 10 s.
11. Switch off the current.
12. Set the injected current to 100% of IBase and switch on the current.
13. Decrease the current slowly under 37 PICKUP.
14. The signal 37 TRIP will be activated when timer 37 trip delay expires.
15. Finally check that pickup and trip information is stored in the event menu.
Section 13 1MRK 502 073-UUS A
Testing functionality by secondary injection
218 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Commissioning manual
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