Large-current control device and method for fire-proof and explosion-proof physical checking test of transformer

Abstract

The invention discloses a large-current control device and method for a fireproof and explosion-proof physical check test of a transformer. The device comprises: a plurality of current controllers, fractures between the current controllers in parallel, and asynchronous controller.The output control port of the synchronous controller is connected with the closing coil and the opening coil of each current controller, and the input port of the synchronous controller is connected with the position switch of each current controller. According to the invention, the current-carrying capability and the short-circuit current breaking capability of the current controllers are multiplied by utilizing the existing current controller and connecting arc extinguish chambers of the current controllers in parallel, the synchronous controller can realize extremely high synchronous performance, and the high precision and automatic error correction of the synchronous controller ensure the stability and accuracy of the control of the synchronous controller; and compared with mechanical linkage, the device has higher reliability and stability.

Description

technical field [0001] The invention relates to the technical field of high-voltage current controllers, in particular to a high-current control device and method for a transformer fire-proof and explosion-proof physical check test. Background technique [0002] During the internal short-circuit fault of the transformer body, the gas generation caused by the arc and the pulsation of the bubble form are the main reasons for the increase of the oil pressure and the rupture of the cavity. In order to verify the fire and explosion-proof capability of the tested transformer, a physical simulation test of an artificial high-current arc fault inside the tested product is required. [0003] For the current controller running on the existing power grid, the breaking capacity of the arc extinguishing chamber is difficult to exceed 63kA, but some high-current test stations have special requirements, and frequent high-current breaking tests are required, so the development of breaking c...

AI Technical Summary

Problems solved by technology

[0003] For the current controller running on the existing power grid, the breaking capacity of the arc extinguishing chamber is difficult to exceed 63kA, but some high-current test stations have special requirements, and frequent high-current breaking tests are required, so the development of breaking capacity is larger Short circuit current capability of the device is very urgent

[0004] On the premise of not improving the existing technology of the current controller, it is the easiest way to directly connect multiple arc extinguishing chambers in parallel. All contacts are controlled to move at the same time through a set of mechanical transmission devices, but the closing and opening times are still out of sync. It can only be solved by fine-tuning the mechanical structure. Due to limited conditions, the actual effect of the method of fine-tuning the contact position of the mechanical structure is not ideal, and after a certain period of operation, its synchronization performance has declined, which has certain safety hazards and cannot meet the high-current test. The station has special requirements for the stability of the frequent operation of the current controller

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