Visual Inspection is Essential
Prefabricated substations, like household appliances, require regular "physical inspections." Start with the exterior:
Box Inspection: Check for rust, deformation, or peeling coatings.
Sealing Test: Ensure door gaps, cable entry holes, and other areas are properly sealed.
Ventilation System: Clean dust screens and check cooling fan operation.
Foundation Stability: Observe the concrete foundation for cracks and settlement.
Internal Component Maintenance
Opening the "black box," these core components require special attention:
Circuit Breaker Maintenance: Check for contact wear and clean dust from the arc extinguishing chamber.
Busbar Connections: Tighten bolts and measure contact resistance.
Insulation Monitoring: Inspect bushings and cable terminals with specialized equipment.
Secondary Circuits: Verify protective devices and inspect terminal blocks.
Operational Data Speaks for You. Let the numbers reveal your equipment's "health":
Temperature Recording: Compare temperature rise curves under different loads.
Sound Monitoring: Use a stethoscope to detect abnormal mechanical vibrations.
Load Analysis: Calculate the duration of peak currents.
Historical Comparison: Create a performance trend chart.