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      • Synchronous Motor
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  • Electrical Relays
Showing 1-9 of 23 results
Types 2Bof 2BProtective 2BRelays

Classification or Types of Protective Relays

  • Categories Power System, Electrical Relays

The IEEE defines protective relays as: “relays whose function is to detect defective lines or apparatus or other power system conditions of an abnormal or dangerous nature and to initiate appropriate control …

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Motor Control Centre

What are Motor Control Centres?

  • Categories Circuit Breaker, Electrical Relays, Power System, Synchronous Motor, Three Phase Induction Motor

The Motor Control Centre is used in general to describe combinations of enclosures, busbars, circuit breakers, power contactors, power fuses, protective relays, controls and indicating devices. Read more about switchgear …

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Application%2Bof%2Binstantaneous%2Bovercurrent%2Brelay

Overcurrent Relays for Transmission Line Protection

  • Categories Electrical Relays, Power System

The use of overcurrent relays is the simplest and cheapest type of line protection. Three types of overcurrent relays are used: Inverse time delay overcurrent (TDOC) relays,  Instantaneous overcurrent relays,  …

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Gas insulated switchgear parts

Introduction to Gas Insulated Substations / Switchgears (GIS)

  • Categories Power System, Circuit Breaker, Electrical Relays, Substation, Switchgear, Transformer

Gas-insulated substations (GIS) have been used in power systems over the last three decades because of their high reliability, easy maintenance, small ground space requirement, etc. This article is an …

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Low voltage Switchgear

Low Voltage Switchgear

  • Categories Power System, Circuit Breaker, Electrical Relays, Generation, Instrumentation, Measurement, Substation, Switchgear

As per IEC 60947, switchgears with rated voltages up to 1000 V ac and 1500 V dc are termed as low voltage switchgear. The term ‘switchgear’ is a generic term …

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relay%2Btime%2Bopt

Instantaneous, Inverse Time and Definite Time Lag Relays

  • Categories Power System, Electrical Relays

In this post, we will explain Instantaneous, Inverse Time and Definite Time Lag Relays and their characteristics. An important characteristic of a relay is its time of operation. By ‘the time …

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substation earthing

Substation Earthing System Design

  • Categories Power System, Basic Electrical, Circuit Breaker, Electrical Relays, Generation, Substation, Switchgear, Transformer

We have already given an introduction to substation earthing system in an article published earlier. Today we are going to discuss the design of substation earthing system. Before 1960s the …

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fundamental requirements of protective relaying

Basic Relays – Electromagnetic Attraction and Induction Relays

  • Categories Power System, Electrical Relays, Substation, Switchgear

Most of the relays used in the power system operate by virtue of the current and/or voltage supplied by current and voltage transformers connected in various combinations to the system …

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Solid State Relay

Solid State Relays (Static Relays)

  • Categories Power System, Basic Electrical, Circuit Breaker, Electrical Relays, Instrumentation, Measurement, Substation, Switchgear

What is a Static Relay? There are two basic classifications of relays – Electromechanical Relays and Solid State Relays (Static relay). One main difference between them is electromechanical relays have …

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