A telescopic contact assembly for a thyristor on-load tap changer

Abstract

The invention provides a telescopic contact assembly for a thyristor on-load tap switch. The telescopic contact assembly for the thyristor on-load tap switch comprises insulation supports symmetrically fixed to the two ends of a touch rod through locating pins. The insulation supports are connected through a connecting piece. Each installation support is provided with a telescopic contact perpendicular to the connecting piece. Static contacts are symmetrically arranged at the two ends of an orientating guide board. The telescopic contact at one end of the connecting piece is provided with a lead connecting piece connected with a thyristor circuit and used for enabling the telescopic contact and one static contact to be connected or disconnected with the thyristor circuit and the other end of the connecting piece is provided with a lead connecting piece used for enabling the touch rod and the other static contact to be connected or disconnected with the thyristor circuit. Compared with the prior art, the telescopic contact assembly for the thyristor on-load tap switch has the advantages that the requirement for timing sequence control of the thyristor circuit is satisfied, the number of moving contacts and the number of the static contacts can be increased, recovery voltage between fractures is effectively reduced, and therefore the different requirements for voltage adjustment or capacitance adjustment of a transformer are satisfied.

Description

technical field [0001] The invention relates to a telescopic contact of an on-load tap changer, in particular to a telescopic contact for a thyristor on-load tap changer. Background technique [0002] The on-load tap changer is an important component of the power voltage regulating transformer and the industrial voltage regulating transformer. It adjusts the tap contact without interrupting the load current of the transformer, and changes the output voltage or output capacity of the transformer; however, the traditional on-load tap changer The arc generated by the switch and vacuum tap changer will inevitably lead to energy loss and pollution of transformer oil. The thyristor on-load tap-changer can completely avoid the generation of arc. With the development of the power system, the traditional on-load tap-changer will be replaced by this new type of arc-free tap-changer. In order to improve the safety of the thyristor switch, the number of contacts of the thyristor switch...

AI Technical Summary

Problems solved by technology

In order to improve the safety of the thyristor switch, the number of thyristor switch contacts is often large, the fracture mode is complicated, the timing control is high, and the design and manufacture are difficult.

For example, each phase of the existing KM-type switch faceplate has 4 tracks, that is, four guide grooves are distributed within a range of less than 120 degrees, and the switching timing of the on-load tap-changer is controlled by the distribution of angles and the speed of the central axis to meet the requirements of the tap changer. According to the requirements of transformation, adding guide grooves on the basis of the original 4 guide grooves may cause mutual interference between the guide grooves and cause the faceplate to be separated, and if the requirement of increasing the guide grooves is achieved by reducing the angle and width It will also be unable to be used in practice due to unreasonable angle distribution, component strength and too complicated mechanism.

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