Low-voltage active harmonic control device

Abstract

The invention relates to a low-voltage active harmonic control device, which consists of an iron core, three coils and circuit breakers. The low-voltage active harmonic control device is characterized in that the iron core is arranged at the two ends of the coils, the circuit breakers are connected with the coils, the three coils are arranged on a distributor, the coils are connected with the circuit breakers through the distributor, and three phases (A, B and C) of a power source and a neutral line are connected with the low-voltage active harmonic control device by the distributor several times. When a wiring transformer exceeds a certain temperature, a power source is automatically cut off. When the wiring transformer drops below the certain temperature, the circuit is automatically restored, so a purpose of harmonic control is realized. The low-voltage active harmonic control device has the advantages that the defects in the prior art are overcome, the harmonic can be effectively filtered, the safety is high, and the cost is low.

Description

Technical field: [0001] The invention relates to a control device for power electronic harmonics, in particular to a low-voltage active harmonic control device. Background technique: [0002] With the extensive application of power electronics and chopper equipment, the harmonic content in the system is getting higher and higher, which has posed a certain threat to the installation stability of the power distribution system. The specific harms are: 1. The harm of reducing the system capacity, which can reduce the capacity of the transformer, reduce the capacity of the circuit breaker, reduce the capacity of the cable, and reduce the capacity of the power grid. 2. Accelerate the aging of equipment, shorten the service life of equipment, or even damage equipment, causing local parallel resonance or series resonance, resulting in the burning of compensation capacitors, protection components and busbars of reactive power compensation capacitor cabinets, which poses a major safet...

AI Technical Summary

Problems solved by technology

The specific hazards are: 1. The hazard of reducing the system capacity, which can reduce the capacity of the transformer, reduce the capacity of the circuit breaker, reduce the capacity of the cable, and reduce the capacity of the grid

2. Accelerate the aging of equipment, shorten the service life of equipment, or even damage equipment, causing local parallel resonance or series resonance, resulting in the burning of reactive power compensation capacitor cabinet compensation capacitors, protection components and busbars, posing a major safety hazard

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