The recording of daily maintenance and inspection results for secondary circuit testing equipment should adhere to the principles of "accuracy, completeness, and traceability." A combination of standardized forms and digital methods should be used to ensure clear information and facilitate subsequent analysis and accountability.
Use a dedicated record form for registration. It is recommended to use the "Secondary Circuit Daily Inspection Record Form" or the "Relay Protection Device Operation and Maintenance Log," which should include:
Inspection time, inspector, equipment name and number
Status record of each inspection item (e.g., whether the indicator lights are normal, whether the meter readings are accurate, whether the terminals are loose)
Description of any abnormalities and handling measures
Signature of the reviewer
Example item:
Date: 2026-03-31 | Equipment: 220kV line protection panel | Indicator lights: Normal | Meters: Phase A current 0.45kA, stable | Terminal blocks: No looseness, no overheating | Remarks: No abnormalities | Inspector: Mr. Zhang
Key items to record:
Signal system: Whether the indicator lights, traffic lights, and audible devices respond correctly
Instrument readings: Whether the current and voltage readings are within the normal range, and whether there are fluctuations or distortions
Wiring status: Whether the terminal screws are... Check for tightness, oxidation, and discoloration of cable heads due to overheating.
Environmental conditions: Cabinet sealing, indoor temperature and humidity, presence of water accumulation or small animal tracks.
Power supply and insulation: DC power supply voltage stability, presence of alarms from insulation monitoring devices.
Abnormal situations must be described in detail and managed in a closed-loop manner.
If an abnormality is found (e.g., relay contact jamming, low insulation resistance), the following must be recorded:
Time of discovery, description of the phenomenon, preliminary judgment
Temporary measures taken (e.g., increased monitoring, removal of pressure plates)
Subsequent handling process (notifying the maintenance team, adding to the defect list)
Final handling result and recovery time, forming a closed loop.
Electronic archiving and periodic review
Encourage the use of PMS (Production Management System) or inspection APP for scanning, uploading photos, and automatic archiving.
Paper records should be organized monthly, archived uniformly, and retained for at least 2 years.
Management personnel should periodically check the completeness of records as a basis for equipment health assessment.
