Category Archives: Electric Current

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Testing and Commissioning Requirements for Switchgear

Before starting the switchgear testing an approved testing & commissioning engineer should be appointed in order to thoroughly review all the applicable drawings and specification, and to become totally familiar with all systems and the design intent. Experience certificate of testing and commissioning engineer to be submitted for client approval and test and commissioning should be… Read More: Testing and Commissioning Requirements for Switchgear »

How to Calculate Torque of DC Motor?

As you are familiar with the principle of a DC motor or DC machine that when it is loaded either as a motor or as a generator, conductors of the rotor are carrying the current. To better understand the concept, imagine the conductors which are laying in the magnetic field which is present in the… Read More: How to Calculate Torque of DC Motor? »

Generator Working Principle – AC & DC Generator

Direct current or DC machines are used for the conversion of one form of energy to another. Similarly a DC Generator is used to generate the energy which works on the principle of converting mechanical energy into electrical energy. Basic law or principle behind the generator is the Faraday’s law of electromagnetic induction which states that… Read More: Generator Working Principle – AC & DC Generator »

Electrical Resistance Reactance & Impedance

Resistance definition & Meaning Understanding of resistance is very basic requirement for electrical engineers or professionals, the question of resistance comes when we are talking about the conductors, metals, wires or cables etc. Electrical resistance in general is a measure of the difficulty to pass through electric current from any conductor. So in simple words we can… Read More: Electrical Resistance Reactance & Impedance »

Circuit Breaker Operating Mechanism MCB Usage & Principle

What is MCB? MCB or Miniature Circuit Breakers is a mechanical switching device which is capable of making, carrying and breaking currents under normal circuit conditions and also making, carrying for a specified time and automatically breaking currents under specified abnormal circuit conditions such as those of short circuit. So we can say that MCB… Read More: Circuit Breaker Operating Mechanism MCB Usage & Principle »

ELCB Earth Leakage Circuit Breaker

What is an ELCB? An Earth Leakage Circuit Breaker (ELCB) is a safety device used in electrical installations with high earth impedance to prevent shock. It detects small stray voltages on the metal enclosures of electrical equipment, and interrupts the circuit if a dangerous voltage is detected. Once widely used, more recent installations instead use… Read More: ELCB Earth Leakage Circuit Breaker »