Testing

TRANSFORMERS

• Routine testing;
  • Insulation Resistance (including absorption ratio & polarisation index)
  • Winding Ratio & Polarity tests
  • Measurement of winding resistance
  • Separate source over voltage withstand test (pressure)
  • High frequency Induced over-voltage withstand test (inter-turn)
  • Determination of magnetising current and no load losses
  • Determination of impedance voltage and full load losses
• Special Testing;
  • TX partial discharge
  • Impulse up to 1MV
  • Temp rise tests
  • Sweep frequency response analysis
  • Power factor & capacitance test (Tan-delta)

ELECTRIC MOTORS

• Load testing;
  • Up to 3.5MW, 4 pole, 11kv
  • Mechanical load (generator)
  • Back to back (Traction motors)
  • Output power
  • Efficiency
  • Commutation (DC motors)
• No-load testing;
  • Up to 36MW, 11KV
  • Full speed, full voltage
  • Vibration
  • Bearing stabilisation
  • Input power
  • No load currents
• Special testing;
  • Open circuit/Short circuit
  • Locked rotor
  • Separation of losses