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General handling and installation precautions for protective relays to ensure performance and prevent failure.
Procedures for unpacking relays, checking for damage, and handling moving parts to prevent damage or setting alterations.
Guidelines for storing relays to prevent dust and moisture ingress, including temperature range and de-humidifier bag use.
Requirements for the installation site, including cleanliness, dryness, illumination, and reference to publications for dimensions.
Overview of commissioning, noting relays are pre-adjusted. Handling of moving parts secured for transit.
Precautions for handling sensitive components to avoid electrostatic discharge, using anti-static bags.
Checking relay ratings, wiring connections, case earthing, and polarity of DC supplies/magnetic blowout contacts.
Steps to access the relay, remove the cover, handle the module, check mechanical settings, and ensure contact follow-through.
Procedures for insulation testing between circuits and earth using a DC voltage tester, consulting application diagrams.
Ensuring the case earthing screw connects the relay to a local earth for safety.
Warning against opening secondary circuits of live CTs due to lethal voltage and potential damage.
List of essential equipment for testing, including a current source and ammeter.
Detailed procedure for electrical tests, including setting plug bridge and potentiometer, checking pick-up, reset, and contact operation.
Checking output contacts for correct closure/opening and ensuring the cover reset mechanism resets the flag.
General principles for armature gap and contact pressure measurements, defining relay contact state in unenergised position.
Specific settings for normal duty make and break contacts, including feeler gauge measurements and force requirements.
Procedure for setting the mechanical flag using feeler gauges and adjusting the catch spring.
Troubleshooting steps for relays failing to operate, checking connections, settings, components, and continuity.
Troubleshooting for relays operating at incorrect values, checking settings, potentiometer, and supply characteristics.
Troubleshooting for output contacts that make mechanically but are open circuit, or are contaminated.
Diagnosing output contacts that fail to operate mechanically by checking push rods, connections, and flag springs.
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