COMEM > COMEM Service > Transformer service

Transformer service

General Maintenance and Electrical Testing

• Measurement of Insulation Resistance
  • Core / Clamp
  • Clamp / Earth
  • Windings / Earth
• Measurement of Winding DC Resistance
• Verification of Voltage Ratio and Vector Group and check of phase displacement
• Measurement of Excitation Current
• Measurement of Dissipation Factor (Tan&) of the insulation system capacitances
• Measurement of Winding Capacitances
• Measurement of Short Circuit impedance at low voltage supply (220/380V)
• Measurement of Magnetic Balance
• Measurement of Dielectric Frequency Response (DFR)
• Measurement of FRA (Frequency Response Analyze)
• General check & Cleaning
  • Check of presence of oil leakages and status of gaskets
  • Check of accessories’ mechanical functionality for TR and OLTC
  • Check of OLTC functionality
  • Check and cleaning of bushings
  • Replacement of Silica gel
• Function tests of protection devices
• Oil sample Analysis

Transformer digitalization

The possibility to collect and analyze data about the transformer’s health is becoming a key pillar for asset and service managers and transformer end-users.

We can help you to choose the right solution and decide the level of digitalization for your transformer

Installation & Commissioning

Accessories replacement & retrofitting

Oil analysis*

• Dissolved Gas Analysis
• Dielectric Breakdown Voltage
• Furan Analysis (Optional)
• Corrosive Sulphur CCD Test (Optional)
• PCB Content (Optional)

*in collaboration with external accredited laboratory