HV Test Solutions

Different tests and measurements are performed during the maintenance and/or commissioning stages in transformers, motors, generators, and other electrical devices; a HV (High Voltage) test is typically used to determine the effectiveness of the insulation that allows them to operate with reliability and safety, and also as the way to get some important parameters for diagnostic and condition assessment purposes.

The requirements of HV test systems used on site depends on the nature of the device under test and the type and range of parameter that is being sought, so that the related HV test equipment differs much according to this; a HV test can be destructive or non destructive, it can be performed with AC or DC, and it can be searching for insulation resistance values, breakdown voltages, dielectric conditions, voltage ratios, etc; the following EuroSMC equipment are products which use a HV test in search of some of those parameters with different HV test and measurement techniques.

HV test applications included in EuroSMC products

We can differentiate between a HV test for transformers and a HV test for motors/generators, although sometimes the same test technique can be applied for both, since the analysis of the winding characteristics and performance is a common target.

The following EuroSMC equipment are designed for HV test applications in transformers, among other applications:


The CV-05 configuration is the minimum required to perform a HV test with the Raptor System, and it is formed by the Raptor Master unit and the Raptor HV. The Raptor is an innovative and advanced substation test system that replaces the need for multiple test sets, with outstanding portability, modularity and adaptability for the main primary test applications in substations and switchgear.

The Raptor HV is an optional HV test slave that complements the Raptor System, extending the Raptor applications for testing transformers, among others. The main HV test applications of the Raptor CV-05 are the following:

  • CT, VT and PT withstand voltage tests
  • CT and VT excitation curve /knee point.
  • VT and PT ratio measurement.
  • Polarity test in VT’s secondary winding.
  • Step & touch voltage measurements.
  • Testing voltage sensors and converters.

For more information, please check the related EuroSMC products or contact us.