Secondary Injection Testing - ABB REJ 513 User Manual

REJ 513
2
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User's Guide

Secondary injection testing

When auxiliary voltage is connected to the protection relay, the relay performs a self-
testing program, which does not include the measuring transformers and the output
contacts. The operational condition of the relay is tested by means of ordinary relay
test equipment and such a test also includes the measuring transformers, the output
contacts and the accuracy of the operate values.
Testing, both primary and secondary, should always be performed in accordance with
national regulations and instructions.
According to the manufacturer's recommendations the relay should be submitted to
secondary testing at five years' intervals. The testing should include the entire
protection chain from the measuring transformers to the relay outputs.
The secondary testing described in this manual is based on the relay's setting values
during normal operation. (If necessary, the secondary testing can be extended by
testing the protection stages throughout their setting ranges.)
All setting values that are altered during the test procedure have to be read and stored
prior to the tests.
To enable secondary injection testing the relay has to be disconnected, either through
disconnectable terminal blocks or a test plug fitted on the relay.
Danger!
Do not open the secondary circuit of a current transformer under any phases of the
testing if the primary circuit is live. The high voltage generated by an open CT
secondary circuit could be lethal and may damage instruments and insulation.
Equipment required for testing:
• adjustable voltage transformer 0...260 V, 1 A
• current transformer
• ammeter, accuracy ±0.5%
• stop watch or counter for time measurement
• ac/dc voltage source for the auxiliary supply
• switches and indicator lamps
• supply and pilot wires
• calibrated multimeter
The secondary current is to be selected on the basis of the rated current, 1 A or 5 A, of
the relay energizing input to be tested.
ABB Substation Automation
Products and Systems
1MRS750613-MUM