DC earth fault relay is commonly used to detect earth fault in DC systems. An ungrounded DC system is used to control the supply of protection systems, control panels, communication, and other networking devices. When one terminal of the DC system is grounded, it is not creating any problem. However, when both the DC terminal … Read more
DC earth fault locator is an instrument that is used to detect earth fault in a live DC system. DC system is used for the running of protection systems in substations, generating stations, communication & networking equipment, and other electronic devices. Due to cable insulation failure or wrong wire connection, the DC terminal can be … Read more
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 any other discrepancy in the CB closing circuit, continuous CB close command can be extended to the closing coil. In that condition, after tripping the … Read more
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 part of power system protection. Always 02 nos. trip circuits are used in the CB for system redundancy. Due to the failure of the trip … Read more
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 connected in parallel with every break of the CB. Reasons for using Grading Capacitors in Circuit Breakers. When the capacitors are connected across the breaks … Read more
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, impedance protection is most commonly used for the protection of transmission lines. When the Impedance value goes below the set value during the fault or … Read more
The main difference between earthing and grounding is that in earthing, the circuit connects directly to the ground to let the fault current flow safely and protect the system. In grounding, the circuit connects to the ground to release excess electrical energy and protect people and devices. What is Earthing? Earthing is used for the … Read more