top of page

Condition assessment on switchgear

Condition assessment provides knowledge about the state of the various components in HV grids. This knowledge contributes to the right decisions regarding maintenance and replacement.

Condition based-maintenance improves the overall performance at a lower cost

VLF Withstand test

The purpose of a withstand test is to verify the integrity of the cable under test. If the test cable has a defect severe enough at the withstand test voltage, an electrical tree will initiate and grow in the insulation. Inception of an electrical tree growth are functions of several factors including test voltage, source frequency and amplitude, and the geometry of the defect.

Maintenance test according to;IEEE 400.2-2013         

  • Good insulation will be unaffected

  • Reveals; Production deviations, poor workmanship and aging.

  • Uses sinusoidal, 0.1Hz waveform

  • 30 min test time

  • Up to 30 km cable can be tested

Insulation testing of AC Electric Machinery with High voltage at Very Low Frequency IEEE Std 433-2009

bottom of page