Various diagnostic tests can be performed on power and instrument transformers using the DV Power range of transformer test instruments. They include DC current tests:

  • Winding resistance measurement
  • Tap changer analysis
  • Make before break OLTC verification
  • Heat run test

as well as AC voltage tests:

  • Transformer turns ratio
  • Excitation current measurement
  • Phase angle measurement
  • Vector group detection
  • Magnetic Balance

DV Power transformer test instruments use the DVtest method for OLTC testing. This is a unique specialised non-intrusive method for OLTC analysis. In addition, the automatic transformer demagnetisation function is used to remove the effects of a magnetised transformer core and to minimise transformer inrush current. DV Power tap changer analysers also include a dedicated AC/DC current measurement channel which is used to monitor the tap changer motor current during tap changer operation.

DV Power are renowned for using cutting-edge-technology to produce light, powerful, and highly accurate battery, circuit breaker and transformer test equipment. DV Power provides a 3-year warranty on all test instrumentation. This is a guarantee to our customers that they will receive the highest quality test equipment on the market.