Quick fault current restrictor based on carrier isolator

Abstract

The invention relates to a quick fault current restrictor based on a carrier isolator, comprising a carrier isolator, an ignition pulse transformer, an electronic measuring and controlling unit, a sensor, a current-limiting reactor, an MOA, a bypass switch, a first isolation switch, a first grounding switch, a second isolation switch, a second grounding switch and a bus-bar; the sensor, a first isolation switch carrier isolator and a third isolation switch are connected on the bus-bar in sequence; one end of the first grounding switch and one end of the second grounding switch are connected with the bus-bar; the other ends of the first grounding switch and the second grounding switch are grounded; the electronic measuring and control unit is connected with one end of the sensor and one end of the ignition pulse transformer respectively; the other end of the ignition pulse transformer is connected with the carrier isolator; and the bypass switch and the MOA are connected in parallel with the current-limiting reactor in sequence. The device provided by the invention can detect the system current failure in time, can restrict the fault current, does not affect the normal power supply of a user, enhances the power supply reliability, and realizes flexible and self-adaptive fault current treatment and self-healing.

Description

technical field [0001] The invention relates to a fault current limiter in the field of flexible alternating current transmission (FACTS) of a power system, in particular to a fast fault current limiter based on a current-carrying isolator. Background technique [0002] With the rapid development of the power system, the continuous increase in the capacity of single machines and power plants, the capacity of substations, the load and load density of cities and industrial centers, and the interconnection between power systems, a new prominent problem has emerged, that is, modern The level of short-circuit current in the power grid at all levels of the large power system continues to increase. The investment of large power sources in the load center has further accelerated the growth of the short-circuit current level. The short-circuit current in some areas of the system has reached or even exceeded the breaking capacity of the circuit breaker, and the rising trend is getting...

AI Technical Summary

Problems solved by technology

The promotion and application of large-scale distributed power and renewable energy will lead to a significant increase in the level of system short-circuit

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