Description; Visual Inspection; Inverse Time Unit; Phase Pickup Calibration Verification - GE MDP Instruction Manual

Digital time overcurrent relay

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GEK-100682D

5 PERIODIC & ACCEPTANCE TESTS

5.1 DESCRIPTION

Immediately upon receipt of the relay, an inspection and acceptance test should be made to make sure that no

damage has been sustained in shipment, and that the relay calibrations have not been disturbed.

Check the nameplate stamping to make sure that the model number and rating of the relay agree with the req-

uisition. Remove the relay from its case and check that there are no broken or cracked molded parts or other

signs of physical damage, and that all screws are tight.

a) PHASE PICKUP CALIBRATION VERIFICATION

1. Set the switch on the front of the relay so the output relays correspond to phase or ground (Position B).

2. Connect the relay as indicated in the figure below. In order to apply current to the relay, use a supply of 120

or 220 volts, 50/60 Hz, with a variable resistor in series, or an electronic test source.

Figure 5–1: TEST CONNECTIONS

GE Power Management

MDP Digital Time Overcurrent Relay

Courtesy of NationalSwitchgear.com

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