Corona Discharge on HV Assets
Corona Discharge on HV Assets Corona discharge is
associated with high voltage equipment such as
electrical transmission lines, transformer
insulators and bushings, switchgear, motors and
the like. Corona can be a sign of a defect,
contamination, malfunction or bad design of
Being able to pinpoint corona discharge and address potential equipment failure is important and can contribute significantly to the reliable operation of electrical apparatus.
Diagnostic methods for physical characteristics: Determination of density
Ultraviolet detects electrical discharges and is
directly proportional to voltage. Partial
discharge, corona and arcing occurs whenever
voltage is present, regardless of current. Both
technologies are complementary and are classified
as NDT – Non Destructive Testing equipment.
Together they cover a wider spectral range and provide enough information to obtain a clear assessment of the condition of electrical assets. As such, both technologies are required to perform comprehensive surveys. Unlike IR which is affected by solar radiation and emissivity of the material, UV detection is effective under all lighting and weather conditions.