Switchgear Repair
HT/LT Vacuum & Air Circuit Breaker Maintenance, Retrofitting & Busbar Servicing
Comprehensive maintenance, refurbishment, and retrofitting of 11kV/33kV Vacuum Circuit Breakers (VCB), Low-Voltage Air Circuit Breakers (ACB), Motor Control Centers (MCC), and copper busbar trunking systems.
Key Deliverables & Specifications
VCB Vacuum Bottle Dielectric Testing
28kV AC Hi-Pot test confirming vacuum integrity and arc quenching capability.
Micro-Ohm Contact Resistance Measurement
Precision 100A Ductor testing ensuring contact resistance remains < 40 micro-ohms.
Motorized Spring Mechanism Overhaul
Refurbishment of trip/close coils, charging motors, and mechanical anti-pumping relays.
Old Breaker Retrofitting Solutions
Custom retrofitting of obsolete oil/gas breakers with modern withdrawable VCBs.
Engineering Scope & Capabilities
HT & LT Switchgear Repair, Maintenance & Retrofitting
Switchgear panels protect your entire electrical distribution infrastructure. Trafo Engineering provides specialized maintenance, vacuum bottle replacement, contact timing diagnostics, and retrofitting for HT VCB panels (Schneider, ABB, Siemens, Trafo-Tech) and LT distribution boards.
Our Switchgear Engineering Scope
- VCB Vacuum Bottle Integrity Testing: High-potential AC withstand testing (up to 28kV AC) to detect loss of vacuum before breaker failure.
- Ductor Micro-Ohm Contact Resistance: Testing breaker primary jaw and tulip contacts to eliminate overheating contact resistance.
- Mechanism Overhauling & Lubrication: Servicing spring-charge motors, trip coils, closing solenoids, and mechanical interlocks.
- Busbar Retorquing & Insulation Shrouding: Retorquing high-tensile busbar bolts with calibrated torque wrenches and applying heat-shrink insulation boots.
Step-by-Step Engineering Methodology
Rack-Out Isolation & Visual Arc Chute Check
Racking breaker out to disconnected position, inspecting arc chutes and main contacts.
Contact Resistance & Timing Analysis
Measuring opening/closing speeds and pole simultaneity with digital breaker timer.
Mechanism Lubrication & Relay Tripping Test
Cleaning mechanism, applying synthetic grease, and validating secondary trip coil signals.
Primary Current Injection & Rack-In
Running primary current injection test to verify CT/relay loop before racking in.
Diagnostic & Calibration Instruments
| Testing Instrument / Apparatus | Capability & Standard Compliance |
|---|---|
| Circuit Breaker Timing Analyzer | SCOT M3K Multi-Pole Breaker Analyzer |
| Contact Resistance Micro-Ohmmeter | Megger MOM2 200A Micro-Ohmmeter |
| AC Hi-Pot Vacuum Tester | Phenix 50kV AC Dielectric Test Set |
| Primary Current Injection Set | 2,000A High-Current Injection System |
Frequently Asked Technical Questions
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