Transformer Testing & Commissioning

Pre-commissioning testing, diagnostic testing and commissioning for new, relocated and returning-to-service transformers, with documented results you can hand to your consultant.

Pre-commissioning tests

• Winding resistance across all tap positions
• Turns ratio, vector group and polarity verification
• Insulation resistance and polarisation index
• Magnetising current and magnetic balance
• Oil dielectric strength and moisture content
• Protection device function checks, including Buchholz, temperature indicators and pressure relief
• Earth continuity and neutral earthing resistance

Commissioning

• Pre-energisation checks and safety isolation
• Tap changer operation and protection setting verification
• Secondary injection testing of protection relays
• Validation of site results against factory acceptance test data
• Phasing, first energisation and load monitoring
• As-commissioned reports and reference data for your asset records

Diagnostic testing and condition assessment

• Partial discharge measurement
• Dissolved gas analysis
• Condition assessment of in-service transformers
• Monitoring of condition trends over time
• Early identification of developing faults to support maintenance planning

Thermographic surveys

• Non-destructive thermal inspection of energised equipment without a shutdown
• Identification of poor connections, unbalanced loads and thermal anomalies that may indicate insulation deterioration
• Early detection of developing faults to help reduce energy losses, maintenance costs and unplanned outages
• Surveys covering transformers, switchgear, air circuit breakers and power control centres
• Periodic inspection of critical equipment, with survey frequency based on operating conditions and equipment risk