GE Multilin DTP-B, Инструкция по эксплуатации

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9. ACCEPTANCE TESTS
GEK-106243E DTP Digital Transformer Protection 9-5
9.10 OPERATIONS
9.10.1 TIME SETTING.
Set the date and time, and check that the setting is performed successfully.
9.10.2 COMMUNICATIONS TRIGGER.
Apply a known current by any of the phases, and operate the communications trigger. Verify, retrieving the header
of the last oscillography record by means of the GE-LOCAL software, that the retrieved time coincides with the
correct time.
9.11 PERCENTAGE RESTRAINT CHECKING
•
Disable the harmonic restraints, and enable the differential function.
•
Set sensitivity to 0.3, and percentage restraints to 50%
•
Apply current to the primary and secondary, so that we have a differential current of 0.00, and a through
current of 2.
•
Increase the current in the primary, and check that it trips when the differential current is equal or higher than
0.3 + 2.00 x 0.5 = 1.30
Check that it trips with an error margin of less than 5% for different through currents, and different sensitivity and
percentage restraint settings.
9.12 HARMONIC RESTRAINT CHECKING
•
Enable the harmonic restraints, and the differential function.
•
Set sensitivity to 0.3, percentage restraints to 50%, and harmonic restraints to 20%.
•
Apply current to the primary and secondary, so that we have a differential current of 0.00, and a through
current of 2.
•
Apply to the primary a second harmonic current of 0.5 Amps, besides the current it already had.
•
Increase the current in the primary, and check that it trips when the differential current is equal or higher than
0.3 + 2.00 x 0.5 + 0.5 / 0.2 = 3.8
Check that it trips with an error margin of less than 5% for different through currents, and different sensitivity and
percentage restraint settings.