Transition circuit of vacuum type on-load tap-changer and operation method

Abstract

The invention provides a transition circuit of a vacuum type on-load top-changer and an operation method. The transition circuit of the vacuum type on-load top-changer comprises a main contact A, a main contact B, a vacuum contact A, a vacuum contact B, a change-over switch T1, a change-over switch T2, a transition resistor R1 and a transition resistor R2, wherein the vacuum contact A and the vacuum contact B are used as a main switching contact and a transition contact in turn. The main contact A is connected with taps, with the odd numbers, of a regulating winding of a transformer, and the main contact B is connected with taps, with the even numbers, of the regulating winding of the transformer. Each change-over switch comprises a first static contact, a second static contact and a movable contact, wherein the first static contact is connected with the corresponding taps of the regulating winding of the transformer, the second static contact is connected with the corresponding taps of the regulating winding of the transformer through the transition resistor, and one end of the movable contact is connected with the corresponding vacuum contact. Compared with the prior art, the transition circuit of the vacuum type on-load top-changer and the operation method have the advantages that the switching tasks of the main switching contact and the transition contact are in the charge of two vacuum pipes in turn, the switching procedure is symmetrical, so that the burning losses of the two vacuum contacts are completely identical, and the electrical service life of the whole on-load tap-changer is greatly prolonged.

Description

technical field [0001] The invention relates to a tap changer transition circuit, in particular to a vacuum type on-load tap changer transition circuit and an operation method. Background technique [0002] The on-load tap changer is a switching device that provides a constant voltage for the transformer when the load changes. The basic principle is to switch between taps in the transformer winding without interrupting the load current, thereby changing the number of turns of the winding, that is, the voltage ratio of the transformer, and finally realizing the purpose of voltage regulation. At present, most of the on-load tap-changers configured in rectification, smelting, and railway traction transformers are fast resistance switching, and work on the principle of extinguishing the arc when the current crosses zero by the arc contact system. This switching principle is especially serious for the contact burnout of the tap changer with frequent switching of transformer work...

AI Technical Summary

Problems solved by technology

Due to the different breaking tasks of the two, the contact burning loss is often very different. It often happens that one contact has a slight burning loss and the other contact has a allowable burning loss thickness and burns out.

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