How to reduce fault current in power system
In medium and high voltage installations, the short-circuit current is a function of the voltage and the inductive reactance of the distribution system. In order to limit the short-circuit current at the same voltage level, the only method is to increase the inductive reactance seen at the fault location. This can be done.
A current limiter is a parallel combination of a copper bar and an current limiting fuse. During normal operation the load current flows through the copper bar which effectively shorts out the fuse. This is the reason why the current limiter has no effect on the.
Current limiters are a good solution to solve the problem of unacceptably high short-circuit currents in industrial sites. Their use has been proven over the years and, in addition to.
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6 FAQs about [How to reduce fault current in power system]
How to reduce fault current in a distribution system?
The reactors can be used at any place in the distribution system to reduce the fault current. However, it will degrade the voltage profile during normal operation. But it is the cheapest method to reduce the fault current. In most cases, a current limiting reactor is connected in series with the circuit or system.
How can a high fault current be reduced?
At the higher levels of short-circuit current (63 kA or more), there are very few options to reduce the high fault current. In this context, it is of major importance to look for solutions that are (a) effective in terms of limiting or mitigating short-circuit current levels, (b) reliable, and (c) of low cost, in a broad sense.
How does a reactor reduce a fault current?
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.
How can a circuit breaker prevent a fault?
Other way is to install Fault Current Limiters (FCLs) which can reduce the magnitude of currents during faults so circuit breaker can interrupt at lower values of currents and don’t need to be changed.
How to deal with fault current?
Implementation of these reactors is also a good option to deal with fault current. It works best when it has to deal with earth/ground currents. It is the most practical approach that is largely implemented. It has two types: Dry-type CLR are air-core reactors having copper windings. Iron core cannot be used due to factor of saturation.
Why do power systems need a decrease in fault current levels?
But, in power systems, generation capacity and increment in fault current levels often go hand in hand. So, an increase in energy demand where mandates increase in generation capacity, at the same time it needs a decrease in fault current level to keep the system protected and stable.