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It is Ratio between Voltage appearing across Faulty phase before interrupting faulty current to Voltage appering across all three phase after failt has been cleared.
It is designed as 1.3 for Solidly grounded system and 1.5 for Ungrounded syste.
From:Sanjay Rathod
ESSAR STEEL LTD(MRSS)
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FranThe first-pole-to-clear factor in a SF6 circuit breaker refers to the time interval between the initial operation of the first pole of the breaker to trip and the subsequent operation of the last pole to clear the fault. This factor is important for ensuring coordinated and efficient fault clearing in the circuit breaker operation.
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What are the differences between a vacuum breaker and a SF6 gas circuit breaker breaker and a sf6 gas circuit breaker?
A vacuum breaker uses a vacuum to extinguish the arc when interrupting a circuit, while a SF6 gas circuit breaker uses sulfur hexafluoride gas. SF6 gas circuit breakers can handle higher voltages and currents compared to vacuum breakers. SF6 gas circuit breakers are also more environmentally harmful due to the greenhouse gas SF6, while vacuum breakers are considered more eco-friendly.
What is the maximum acceptable tan delta value of 132 KV SF6 circuit breaker?
The maximum acceptable tan delta value of a 132 KV SF6 circuit breaker is typically around 0.3. This value indicates the insulation quality of the circuit breaker and should be within the specified range to ensure safe and reliable operation. If the tan delta value exceeds this limit, it may indicate potential insulation issues that need to be addressed.
What is a Circuit breaker and explain type circuit breakers?
A circuit breaker is an electrical device that automatically interrupts the flow of electricity in a circuit when it detects a fault or overload, to protect the circuit from damage. There are several types of circuit breakers, including thermal, magnetic, and gas-insulated circuit breakers, which operate based on different principles to ensure the safe operation of electrical systems.
What is load breaker switch?
A load breaker switch is a type of electrical switch that is designed to disconnect or interrupt the flow of electrical current in a circuit. It is commonly used to safely isolate electrical equipment for maintenance or repairs, or in emergency situations to protect the circuit from overloading or short circuits.
What is the Difference between circuit breaker and a relay?
A circuit breaker is a device designed to protect an electrical circuit from damage caused by excess current flow (overload) or short circuit. A relay is an electrically operated switch that opens and closes circuits electromechanically or electronically. While both devices can control the flow of electricity, a circuit breaker is primarily a protective device, while a relay is used for switching or controlling circuits.
