Transformer Oil BDV Testing Procedure

The dielectric strength of transformer oil is known as BDV or break-down voltage. A Transformer Oil BDV test is performed to find the dielectric strength of transformer oil. BDV is the minimum voltage withstand the capacity of transformer oil without…

Critical Disruptive Voltage & Visual Critical Voltage

Critical disruptive voltage is defined as the voltage at which complete disruption of the dielectric strength of air occurs. if the voltage increases above critical disruptive voltage corona occurs.  𝛿: air density correction factor  r: radius of conductor  d: distance of…

PMMC instrument-Working, Construction, Advantages

The permanent magnet moving coil instruments (PMMC instruments) are suitable for DC quantity measurements only. PMMC instruments working principle based on Faraday’s law of electromagnetic induction states that when the current carrying coil is placed in the magnetic field it experiences…

Earthing Resistance Testing Procedure

Why Earthing/grounding testing is Necessary? Testing the quality of the Earthing system has been a critical part of any electrical system maintenance program. Ground electrodes provide a safe path to Earth for the dissipation of fault currents, lightning strikes, static…

What is Skin Effect? Definition Factors affecting

Definition: The non-uniform distribution of current through the given cross-section area of the conductor, when it operated on AC current is known as the Skin Effect. When DC current flows through the conductor it is distributed uniformly throughout the cross-section area…