Fault current limiter on basis of combined rapid switch-on switch

Abstract

The invention relates to a fault current limiter on the basis of a combined rapid switch-on switch. The combined rapid switch-on switch is firstly connected in parallel with a capacitor C and then is connected in series with a conventional reactor L; the combined rapid switch-on switch is formed by combining a tight coupling double-winding reactor and a rapid switch-on switch, of which dotted terminals are opposite; a first winding L1 of the tight coupling double-winding reactor is firstly connected in series with the rapid switch-on switch and then is connected in parallel with a second winding L2; the rapid switch-on switch is formed by connecting one group or a plurality of groups of mechanical switches K, transistors T, controllable trigger gaps G and lightning arresters MOV in parallel; and in the case of a short circuit fault, switch-on on the first winding L1 of the tight coupling double-winding reactor can be implemented by selecting the rapid switch-on switch with tolerance to a low short circuit current. After the first winding L is conducted, reactances generated by the first winding L1 and the second winding L2 of the tight coupling double-winding reactor are balanced out mutually, so that the reactances are reduced.

Description

technical field [0001] The invention relates to a fault current limiter. Background technique [0002] With the rapid development of the national economy, the society's demand for electricity continues to increase, which drives the continuous development of the power system. The capacity of single machines and power plants, the capacity of substations, and the load of cities and industrial centers continue to increase, which makes the interconnection of power systems , the level of short-circuit current in the power grid at all levels is increasing continuously, and the destructiveness of short-circuit faults to the power system and its connected electrical equipment is also increasing. Moreover, while the demand for electric energy is increasing day by day, people also put forward higher requirements for power quality, power supply reliability and security. However, the transient stability of large power grids is more prominent, and one of the most important reasons is tha...

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Problems solved by technology

However, all the capacitor bypass circuits mentioned above need to pass close to the full short-circuit current. Therefore, the components of the capacitor bypass circuit need to be designed to withstand the full short-circuit current, and the cost is very high.

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