ANSI Codes of Frequency Protection Relay
ANSI codes of frequency relay are 81H, 81L, 81 R. The 81H, 81L, 81 R are frequency relay acronyms for over-frequency, under-frequency, and rate of … Read more
Protection
Lightning Arrester-Definition, Working & Characteristics
Lightning Arrester is a device used for the protection of electrical equipment against lightning stroke. The lightning stroke is the high voltage transients caused by … Read more
ANSI Device Numbers
The ANSI standard device numbers ( As per ANSI/IEEE standard C37.2) are used in the design of an electrical power system. These devices protect the … Read more
Why is grit Laid in the electrical switchyard?
Grit in the electrical switchyard is laid to make the upper surface of the soil more resistive. The more resistivity of the soil decreases the … Read more
Classification of Relays | Different Types of Relays
In this post, we shall discuss different types of Relays like Latching Relay, Reed Relay, Solid State Relay, Differential Relay, Automotive Relay, Timer Delay Relay, … Read more
Phase Fault Protection
Phase fault protection is used for protection of induction motor. The protection relay trips the motor in the case of fault. We can call the … Read more
What is Through Fault?
Through fault occurs outside of the protective zone. In other words,occurrence of the external faults outside of the equipment protective zone is called through fault. … Read more
Single Phase Preventer Working Principle | Induction Motor Protection
In this post, we will learn the single-phase preventer working principle. We use a single-phase preventer to protect the induction motor from a single phasing fault. … Read more
What is a Protective Relay? Principle, Advantages, Applications
A protective relay is an electrical device that monitors the voltage and current using CTs and PTs. Thus, the main function of the protective relay … Read more
What Happens if DC supply fails in an electrical substation?
This article describes the importance of DC supply in substations. Circuit breakers are the main power-controlling elements that are switched on and off during normal … Read more