Anti pumping relay in Circuit Breaker –Diagram, Working principle
Anti pumping relay is used in the circuit breakers to prevent unwanted closing of the breaker after immediate tripping. Due to failure of the TNC switch (Trip normal close) or […]
Trip circuit supervision relay – Diagram, Working Principle
The trip circuit supervision relay always monitors the healthiness of the trip circuit including a connected trip coil of the CB. Tripping or isolation of CB is the most important […]
Why does Grading Capacitor use in Circuit Breaker?
Grading capacitor is commonly used in High Voltage Circuit Breaker for uniform voltage distribution across the Breaker contacts at CB open position. In a multi-break Circuit Breaker, Grading capacitors are […]
Backup impedance protection in Generator, Transformer & Reactor
In addition to the general protection, backup impedance protection or distance protection is also used in Generator, Transformer & Reactor to protect during external faults in the power system. Generally, […]
Difference between Earthing and Grounding | Earthing vs Grounding
The main difference between earthing and grounding is that – Under Earthing, the circuit is physically connected to the ground to flow circulating current or fault current of the circuit […]
What is Floating Neutral? Effects and How to Test and Fix it?
Floating neutral is a condition, in which the neutral wire of any circuit is disconnected from the ground. In AC system, the neutral wire is permanently grounded to the earth. […]
What is OLTC or On-load tap changer in Transformer? Working Principle
OLTC stands for On-load tap changer which is used in Transformer to regulate the output voltage. OLTC is installed inside the transformer main tank. It is operated by a Drive […]
Causes of over voltage in Power System
When the voltage goes higher than the rated voltage is called Over Voltage. It is a very common issue in Power systems. System voltage is to be maintained as per […]
What is Restriking Voltage? Effects and Methods of Arc Extinction
After opening the Circuit Breaker under load or fault condition, a transit voltage appears across the breaker contacts which is called Restriking Voltage. Frequency of Restriking voltage goes in kH. […]
What is corona effect? Advantage and Disadvantage of Corona
The Corona Effect is the phenomenon of electric discharge in high voltage transmission lines and substations. Hissing noise and violet glow were observed under the corona effect. Power loss, damage […]