Preparation Phase:
Power Off Detection: Ensure the cable is powered off (power off is required for insulation resistance testing).
Safety Protection: Wear insulated gloves and goggles, and use insulated tools.
Equipment Calibration: Check the power and calibration status of testing instruments (such as clamp meters and thermal imagers).
Testing Phase:
Insulation Resistance Test: Connect the tester electrodes to the cable conductor and sheath, apply voltage, read the resistance value, record the data, and compare it with the standard.
Leakage Current Detection: Clamp the clamp meter to the grounding wire and observe whether the current value is stable. If the fluctuation exceeds 10%, further investigation is needed.
Infrared Thermal Imaging Detection: Scan the entire length of the cable, focusing on areas prone to heat generation such as joints and bends. Retest if the temperature is abnormal.
Analysis Phase:
Data Comparison: Compare the test results with historical data or industry standards to determine the leakage risk level.
Leakage Point Location: Combine multiple methods (such as partial discharge + infrared thermal imaging) to accurately locate the leakage point.
Treatment Phase:
Repair or Replacement: Repair or replace the entire cable with damaged insulation.
Retesting and Verification: Retest after repair to ensure the leakage problem is completely resolved.
