Adjustable digital load box for low-pressure pressurization in converter station subsystem debugging

Abstract

The invention belongs to the technical field of electric power safety maintenance, and particularly relates to an adjustable digital load box for low-pressure pressurization in converter station subsystem debugging. The load box comprises a support frame, crosspieces, a resistor connecting block and a non-inductive resistor, wherein universal wheels are arranged at the bottom of the support frame; the crosspieces are symmetrically fixed to the two sides of the support frame; the non-inductive resistor is fixedly connected with the resistor connecting block, and the resistor connecting block is detachably connected with the crosspieces or the support frame; and the left end and the right end of the non-inductive resistor are symmetrically provided with binding posts, and the binding posts are connected in series or in parallel. The adjustable digital load box for low-pressure pressurization in converter station subsystem debugging is convenient to carry, digitized, simple and convenient to operate, large in adjusting range and capable of meeting the requirements of low-pressure pressurization tests of different valve tower manufacturers of a convertor station for a trigger voltage and a conduction current.

Description

technical field [0001] The invention belongs to the technical field of electric power safety maintenance, and in particular relates to an adjustable digital load box for medium and low voltage pressurization in the commissioning of a sub-system of a converter station. Background technique [0002] Before the converter valves of the UHV converter station are put into operation, the low-voltage pressurization test of the converter transformer with valve group must be completed. The purpose is to check the primary wiring of the converter transformer, the synchronous Whether the voltage indication of the voltage divider at the end screen of the converter transformer, the phase sequence of the primary voltage, and the triggering sequence of the valve group are correct, and the correctness of the return signal of the valve base electronic cabinet (VBE), in order to make the low-voltage pressurization test of the valve group of the converter station The voltage on the valve side of...

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Problems solved by technology

[0003] In the past, the low-voltage pressurization test of the converter station often used a fixed-value resistor as the load, and the conduction of the thyristor of the converter valve was realized by adjusting the input voltage of the grid side. In the process of changing the voltage, the synchronous voltage error will increase, thereby affecting The conduction rate of the thyristor of the converter valve increases the error of the low pressure pressurization test result of the converter valve

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