Switchgear

Valve Type Lightning Arrester - Construction & Working

Valve type lightning arrester is an improved and expensive lightning arrester which is also called a nonlinear surge diverter. A valve type arrester gets its name from the fact that a nonlinear resistor regulates itself from the …

What is Surge Absorber? - Types of Surge Absorbers

What is Surge Absorber or Lightning Absorber? A surge absorber is a protective device that absorbs the high voltage surges and reduces the steepness of the surge wavefronts. The traveling waves set up by the surges on the trans…

Effect of Power Swing or Power Surge on Distance Relays

When there is a sudden and large change in the power system i.e., due to removal of a fault or a sudden change in the load, there will be a change in the phase angle between the induced voltage on the line. Consider a transmissio…

Torque Equation of Induction Relay - its Derivation

The induction relay works on the principle of electromagnetic induction similar to the induction motor and energy meter. It consists of two electromagnets and a rotating disc placed between the two electromagnets. The torque prod…

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