Ring Main Unit (RMU) – Introduction

Ring Main Unit
Ring Main Unit,RMU is a compact, enclosed and sealed type of Switchgear used for medium voltage power distribution. It is a complete Switchgear in itself. A complete Switchgear means, assembly of required switching devices, protection device as well as metering device. RMU of different voltage...
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How to Disable Full DR Alarm in Numerical Relay?

These days mostly Numerical Relays are used for protection purpose instead of conventional Electromechanical Relays. In fact, Numerical Relays offer a variety of protection as well as trouble shooting features. A single Numerical Relay can provide many protection unlike conventional Electromechanical Relays. A single Numerical...
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Transient Recovery Voltage (TRV)

“The Transient Recovery Voltage refers to the voltage across the pole immediately after arc extinction. Such voltage has a power-frequency component plus an oscillatory transient component.” In alternating current circuit breakers, the current interruption takes place invariably at the natural zero of the current wave....
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Causes of Insulation Deterioration

Heat is the prime cause which leads to electrical insulation deterioration. Some possible causes of heat generation in the electrical insulation are as follows: Heat is generated in the electrically stressed insulation, due to dielectric loss and conduction currents. Heat is imparted to insulation by...
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