Intelligent control system for phase-controlled switching vacuum circuit breaker of no-load transformer

Abstract

The invention provides an intelligent control system for a phase-controlled switching vacuum circuit breaker of a no-load transformer and belongs to the technical field of circuit control. The problemis solved that an existing vacuum circuit breaker cannot effectively inhibit excitation surge current. The control system of the vacuum circuit breaker of the transformer comprises a plurality of vacuum circuit breakers, a driving device and a controller controlling the driving device to move, wherein the controller is connected with an external power supply, on and off of a total circuit are controlled through a switch K, a start-stop switch device is arranged between the controller and the vacuum circuit breakers and used for controlling work starting and stopping of each vacuum circuit breaker, an indicating lamp for judging the working state of each vacuum circuit breaker is arranged on a wiring branch for the external power supply and the controller and is in motion connection with the driving device through a travel switch, and a capacitor set for storing electric energy of the external power supply and a change-over switch for controlling separation and combination of the capacitor set are connected to the controller. The intelligent control system has the advantages of being capable of accurately executing closing operation and safe and reliable.

Description

technical field [0001] The invention belongs to the technical field of circuit control and relates to a control system, in particular to an intelligent control system for phase-controlled switching of vacuum circuit breakers of no-load transformers. Background technique [0002] With the continuous progress and development of modern society, the government began to focus on improving and perfecting the power infrastructure, and put forward higher requirements for its practicability and reliability. The power transformer is at the core of the power transmission and distribution system in the power infrastructure. Since the iron core of the no-load transformer has residual magnetic flux, when the construction personnel randomly close the no-load transformer, sometimes the excitation current will cause the iron core to saturate, resulting in Magnetizing inrush current several times the rated current. Exciting inrush current can reduce the service life of the transformer, cause...

AI Technical Summary

Problems solved by technology

Exciting inrush current can reduce the service life of the transformer, cause the differential protection to lock, cause the transformer to fail, introduce harmonics into the power grid, and cause commutation failure of the DC station, thereby reducing the power supply reliability of the power system

In order to suppress the excitation inrush current, the methods currently used include pre-insertion resistance method, demagnetization method, simple phase control method, and brake locking method, but none of the above methods can effectively suppress the excitation inrush current and will reduce the reliability of power grid operation

Images