Methods of Ground/ Earth resistance measurements on existing systems

It is vital to maintain good ground in a system. In order to ensure that, ground resistance measurements and tests are conducted on existing earth electrodes at periodic intervals after their installation. This ensures the resistance in the ground is at an acceptable level and is maintained. Here are the different methods of ground/ earth … Read more

What are the essential components of a protective relay?

What are the essential components of a protective relay? The essential components of a protective relay are the following: 1.       Sensing element. 2.       Comparison element. 3.       Control element   Related searches: What is a protection relay? Protection relay What is the purpose of protection relay? Why is protective relay used? Relays Why relays are used … Read more

What are the main functions of a protection relay?

What are the main functions of a protection relay? The main functions of a protective relay are the following: ·         Detection of the presence of a fault. ·         Detection of presence location of a fault. ·         Detection of presence type of fault. ·         To close the trip circuit and operate the circuit breaker to isolate … Read more

What is a protection relay?

    What is a protection relay?     Protection relay is an electrical device used to sense an abnormal condition in a power system and operate a circuit breaker or an alarm signal. Related searches: What is a protection relay?    Protection relay   What is the purpose of protection relay? Why is protective … Read more

How rating of a circuit breaker for a system is determined?

How rating of a circuit breaker for a system is determined?   The rating of a circuit breaker for a system is determined based on the balanced three phase fault occurring in it. Even though the three phase faults are quite rare, it imposes the most severe duty on the circuit breaker. Hence for any … Read more