Low-voltage phase-controlled half-core reactor for low-voltage static var compensation equipment

Abstract

The invention discloses a low-voltage phase-control half-core electric reactor used for low-voltage static reactive power compensation equipment, belongs to the field of electric reactors, and particularly relates to the phase-control electric reactor applicable to the low-voltage static reactive power compensation equipment. The low-voltage phase-control half-core electric reactor used for the low-voltage static reactive power compensation equipment is characterized by being of a half-core structure and being formed by coils and a segment of iron core contained in each coil; the annular iron core installed between an inner insulating cylinder and an outer insulating cylinder is formed by radiation laminations, wherein the upper end and the lower end of the iron core are filled with insulating packings, and the two ends of the inner insulating cylinder are provided with end pressing blocks in a wedged mode; an electric reactor winding which is of an encapsulated structure is arranged outside the iron core. The winding is fixedly bound to the iron core and is in mechanical connection with insulators through the insulating end pressing blocks; the coils in the encapsulations are wrapped, wound and filled to form a whole in an insulated mode; the ends of the encapsulations, the upper end of the iron core and the lower end of the iron core are filled with the insulating packings to form a slope shape; heat dissipation air passages are formed between the encapsulations; leads of all the coils are connected to a connection terminal located on one side of the upper end pressing block and connected to a connection terminal located on one side of the lower end pressing block.

Description

technical field [0001] The invention belongs to reactors, in particular to phase-controlled reactors suitable for low-voltage static var compensation equipment. Background technique [0002] Usually low-voltage dynamic reactive power compensation mainly uses thyristor switches to quickly switch capacitors (TSC for short), and its response speed can reach within 40mS at the fastest. However, since it belongs to step switching, its compensation accuracy is not high. In order to avoid the impact of closing inrush current and operating overvoltage on thyristor switches and capacitors, it is necessary to go through the zero-crossing process detection before each group of capacitors is switched. The requirements for the control and detection process are high, and in some systems with high harmonic levels on site, batch damage of thyristor switches or capacitors often occurs. In recent years, low-voltage static var compensation devices have been applied. The control core is phase-...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of poor control linearity, high cost, heavy weight, and loud noise of the existing phase-controlled iron-core reactors, as well as the problems of large volume and serious external magnetic flux leakage of the phase-controlled air-core reactors, the purpose of the present invention is to provide a A low-voltage phase-controlled half-core reactor for low-voltage static var compensation equipment. The low-voltage phase-controlled half-core reactor for low-voltage static var compensation equipment combines the advantages of air-core reactors and iron-core reactors, which can be used as It can make the inductance have a linear relationship in a large range when it is small in size, and can be installed in a low-voltage cabinet or directly used outdoors

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