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Ground Potential Rise (GPR) refers to the increase in electrical potential between the ground and a point of reference when a fault occurs on a power system. It is caused by lightning or high voltage ground faults. Under these conditions the potential of the soil surrounding the point of ground fault increases to dangerous levels. … Read more
Grounding systems are required not only to ensure the safety of the personnel and the safe operation of equipment but also to protect the system from lightning and ensure accurate measurement of electrical parameters. Here are a few factors that influence the requirements for a good grounding system. The following are the major factors influencing … Read more
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
The fall of potential method or 3-point method is the most commonly used method to measure ground resistance. It is used to determine the earth resistance of an existing grounding system. The fall of potential method requires only a minimum amount of calculation and is best suited for small installations. It can be used for … Read more
In an AC power system, the power factor is a very important parameter that defines how efficiently electrical power is being utilized by the load. It is a rational number between -1 and 1 but has no unit. The p.f of a system depends on the type of load present, whether resistive, inductive, or capacitive. … Read more
The following are the basic requirements of any power system protection system: Reliability Simplicity Selectivity Sensitivity Speed of operation Economy
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? 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? 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
