Fault current limiter

Abstract

This specification relates to fault current limiter (FCL). More particularly, to solve problems of protecting and designing current limiting impedance in a protective coordination system, as limitations of the related art, the fault current limiter may measure heat capacity of a current limiting impedance unit (200) by detecting fault current flowing to the current limiting impedance unit and limiting the fault current flowing to the current limiting impedance unit according to the measured heat capacity, which may result in preventing the current limiting impedance unit from being damaged due to the fault current, preventing an extended accident due to the damaged current limiting impedance unit and enabling a stabilized system and line protection.

Description

technical field [0001] This specification relates to fault current limiters, and more particularly, to a fault current limiter capable of preventing a fault current impedance unit from Damaged due to fault current. Background technique [0002] Typically, fault current limiters (FCLs) do not have their own blocking capability. Therefore, the FCL allows a limited fault current to flow until it is interrupted by a circuit breaker installed in the system. In a typical protective fit, such as figure 1 As shown, for the fault F2, the fault current should be blocked by the second circuit breaker CB2. When CB2 fails due to a problem, the first circuit breaker CB1 operates as backup protection. And, for the fault F1, the fault current is blocked by CB1. Therefore, the thermal capacity of a conventional FCL impedance is designed and manufactured even taking into account the blocking time taken by the backup protection through CB1 due to the failure of CB2. exist figure 1 In th...

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Problems solved by technology

This will most likely cause damage to the FCL and even cause problems with the system

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