AC low-tension intelligent type comprehensive distribution box device for public transformer substation

Abstract

The invention discloses an AC low-tension intelligent type comprehensive distribution box device for a public transformer substation, comprising a box shell body, a cable outlet chamber and a cable inlet chamber, wherein the box shell body, the cable outlet chamber and the cable inlet chamber are mutually assembled; the box shell body is internally provided with a reactive power compensation device, an isolating fracture or an isolating switch, the reactive power compensation device and an wire outlet loop protection switch or a fuse protector, wherein the wire inlet end of the isolating clearance or the isolating switch is connected with a metering mutual inductor; the information of a current sampling mutual inductor is communicated with the reactive power compensation device; and a maintransverse copper bus is connected with a main protection switch of the reactive power compensation device or the fuse protector and controls the on-off of the power supply of the reactive power compensation device. The invention realizes the low power consumption and no flashy flow and no temperature rise in the operating process, the controlled silicon and no power consumption by adopting the high-capacity reactive power compensation device and realizes the purposes of inputting high-capacity compensation in steps by adopting a small capacitor due to small module volume and high power density, and electric capacity arranged in the capacity of a same frame is enhanced by 30 percent, and the maximum compensation capacity achieves 180 kVar; in addition, a structure of the multipath two-path wire outlet loop protection switch or the fuse protector is adopted, therefore, a protection function of little overload current and low short circuit current is enhanced.

Description

technical field [0001] The invention relates to the technical field of distribution boxes, in particular to an AC low-voltage intelligent integrated distribution box device for public substations, which is suitable for electric energy metering and measurement, control protection, line isolation, power factor improvement, and voltage increase at the low-voltage side of public substations. Multi-functional integrated distribution box with high quality and low line loss. Background technique [0002] At present, the distribution boxes used in the low-voltage side of urban and rural public substations in China, some distribution boxes are only equipped with a main switch, the main switch only plays the role of control protection and line isolation; There is a compensation device with less capacity, and the compensation device is not automatically switched. Such a distribution box does not obviously improve the power factor, improve the voltage quality, and reduce the line loss; ...

AI Technical Summary

Problems solved by technology

[0005] One is a single plan, only one main switch plus fuse, or circuit breaker protection and outgoing line, which cannot fully meet the requirements of adapting to public substations, only two-way outgoing lines can be spliced ​​on the main switch, which weakens the small Protection function of overload current and small short circuit current;

[0006] The second is that the capacitance compensation method is mainly based on the three-phase co-compensation method of static compensation. If high-performance dynamic compensation is to be used, the cost investment will be too large, and the compensation capacity will be greatly reduced. At most, capacitors with smaller capacities can only be installed;

[0007] Third, if the primary main switch designed by the original equipment is equipped with a circuit breaker structure, it will not meet the requirement of having a clear break point; if a knife fuse switch is selected, the product specification on the market has a maximum rated current of only 630A, which cannot meet the requirements. 400kVA and 500kVA transformer distribution requirements

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