Protective Relay Calibration and Functional Test

This template is used to document calibration and functional testing of protective relays against the approved coordination study or setting sheet. It captures pickup, timing, trip verification, and as-left settings so you can prove the relay operated as intended. It is especially useful during commissioning, factory acceptance, periodic maintenance, or after a protection setting change.

Use this template when the work involves protective relays, trip circuits, and coordination settings, not just a visual check of electrical equipment. A general inspection form usually misses critical details like pickup tolerance, end-to-end trip path verification, and trip circuit supervision status. If you need evidence that a relay actually operated within the study limits, this is the right template.

The cadence depends on the equipment criticality, utility or owner requirements, and the maintenance program, but relays are commonly tested at commissioning and then on a planned periodic basis. Many organizations also retest after firmware changes, setting changes, breaker work, nuisance trips, or any event that could affect the trip path. The template helps you document whatever interval your program requires.

A qualified person with relay testing experience should perform the test, and a supervisor or reviewer should sign off when your procedure requires it. The person running the test should understand lockout-tagout, arc-flash and shock boundaries, CT/PT behavior, and the specific relay model being tested. This is not a casual operator checklist.

This template supports electrical safety and maintenance programs aligned with OSHA general industry requirements, NFPA 70E practices for electrical work, and ANSI/IEEE protection testing expectations. It also helps document that the relay settings match the approved coordination study and that the trip circuit was verified before injection. If the equipment serves a life-safety or process-critical function, the record can also support internal audit and reliability requirements.

Common mistakes include testing without confirming the approved setting sheet at the point of work, skipping trip circuit supervision checks, and recording only pass/fail without the measured pickup or timing value. Another frequent issue is failing to verify the correct breaker or lockout relay actually received the trip output. The template is designed to prevent those gaps by forcing observable, testable entries.

Yes. You can add sections for specific protection functions such as differential, distance, ground fault, undervoltage, or frequency elements, depending on the relay package. You can also adjust tolerances, test methods, and evidence attachments to match your utility, plant standard, or OEM procedure. The base structure already supports those additions without losing the core verification steps.

It can be used as the inspection record that feeds your CMMS, asset register, or commissioning package. The asset ID, firmware version, test equipment calibration status, and attached printout make it easy to link the result to a work order or preventive maintenance task. If you track deficiencies separately, the corrective action section can be used to trigger follow-up work.

Record the deficiency, the measured value, the expected value, and the likely impact on coordination or selectivity. Then document the corrective action, which may include retesting, setting correction, wiring verification, CT/PT polarity review, or escalation to engineering. Do not leave the form as a simple fail without a disposition.