admin 1 unit electricity is an important parameter for understanding of energy consumption by the electrical load. A Watt (W) is the standard unit of power or load. The rate of energy transfer over a unit of time, is called watt(W). 1 kW =1000 W. When 1 kW load is running for 1 hour time, the … Read more
The nature of the works of the Isolator and Circuit Breaker is the same, both are used to isolate the circuit from the connected supply. The operating characteristics of both the equipment are different and based on the requirement they are used in a different locations in electrical switchgear. What is Isolator? The isolator is … Read more
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 – Under Earthing, the circuit is physically connected to the ground to flow circulating current or fault current of the circuit to the protection of the system, Under Grounding, the circuit is physically connected to the ground to discharge the electrical energy to earth for protecting … Read more
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. However, floating neutral may occur in a power system due to loose connection, braking of neutral flat, wrong circuit connection, or due to short circuit. … Read more