Gate circuit transistor controlling series transformer type electrified railway dragging net pressure-regulating-apparatus

Abstract

A thyristor control series transformer type traction electric network automatic voltage regulator which can be arranged inside a traction substation or on a middle part of a feeding section of a traction electric network consists of a step down transformer, a series transformer, a reactor, a bi-directional thyristor, a controller, a voltage transformer, a current transformer, a breaker and a isolating switch, etc.; the utility model is characterized in that: the step down transformer has a first side connected with a traction bus line and a second side provided with a plurality of tap joints respectively connected with a first side winding of the series transformer by the bi-directional thyristor and the reactor, a second side winding of the series transformer is connected in series with the traction electric network, the controller collects voltage and current signals of the traction electric network by the voltage transformer and the current transformer and controls switch-on and switch-off of the bi-directional thyristor by an inner voltage control logic, which results in automatically on-load adjusting the traction electric network voltage; the second side of the series transformer is provided with a bypass isolating switch; a side of the traction bus line and the traction electric network are respectively provided with current transformers in order to realize current differential protection.

Description

Technical field [0001] The invention belongs to the technical field of electrified railways, and specifically relates to a thyristor controlled series transformer type automatic voltage regulating device for an electrified railway traction network. Background technique [0002] Due to the rapid growth of transportation volume, many existing electrified railways in my country have the problem of low traction network voltage. Under heavy load, the voltage of the train at the end of the power supply arm is even lower than 19kV, while the rated voltage of electric locomotives and EMUs is 25kV , The voltage drop will affect the power of the train. Generally, trains below 19kV cannot operate normally, and even cause parking accidents. At present, shunt capacitor compensation devices are generally installed in traction substations, and some traction substations have also added auto-voltage regulating transformers to improve voltage. The main purpose of the shunt capacitor compensation d...

AI Technical Summary

Problems solved by technology

The main purpose of the shunt capacitor compensation device is to compensate reactive power and improve power factor. Its ability to improve voltage is limited. It can only reduce the voltage loss in the main transformer and high-voltage power grid, but cannot compensate the voltage loss in the traction network.

The self-coupling voltage regulating transformer has the problems of large equipment capacity, high operation loss and low reliability, and has not been popularized and applied.

On electrified railways in remote areas of my country, the problem of low voltage of the traction network is relatively common. Due to the weakness of the power grid supplying electrified railways, the no-load voltage has been raised to the limit, close to 29kV. The voltage drop is very severe, which affects the capacity of the line, so there is an urgent need for a device with small capacity, reliable operation, and strong voltage regulation capability

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