What are fault current limiters?
A fault current limiter (FCL), also known as fault current controller (FCC), is a device which limits the prospective fault current when a fault occurs (e.g. in a power transmission network) without complete disconnection. The term includes superconducting, solid-state and inductive devices.
How do you control fault current?
1. Use of reactors. Reactors can be installed anywhere in the distribution circuit in order to limit the fault current. Since they are essentially a linear inductive reactance, their impedance will add arithmetically to the system impedance and result in a reduction of the fault currents.
What is the purpose of fault current limiter?
A fault current limiter (FCL) limits the amount of current flow- ing through the system and allows for the continual, uninterrupted operation of the electrical system, similar to the way surge protectors limit damaging currents to house- hold devices.
How does fault current work?
The fault current is the electrical current which flows through a circuit during an electrical fault condition. A fault condition occurs when one or more electrical conductors short to each other or to ground. Fault interruption devices include fuses, circuit breakers and relays.
Is-limiter working principle?
Principle of the IS-limiter The IS-limiter is in principle a combination of an extremely fast-acting switch, which can conduct a high rated current but has a low switching capacity, and a fuse with a high breaking capacity mounted in parallel.
What is a superconductor fault current limiter?
Superconducting Fault Current Limiter (SFCLs) is innovative electric equipment which has the capability to reduce fault current level within the first cycle of fault cur- rent. SFCL have zero impedance under the normal condi- tion and large impedance under fault condition.
Do transformers limit fault current?
A general purpose transformer is suitable to be connected to a system with the specified fault level, but the transformer impedance will limit the fault current through it to well below the available fault level.
What is overload current?
The overload current is an excessive current relative to normal operating current, but one which is confined to the normal conductive paths provided by the conductors and other components and loads of the distribution system.
What is non superconducting fault current limiter?
In the tests, the NSFCL successfully protects the system from 100kA potential fault current, by limiting the fault current to a pre-determined level of 50A. …
