Converter station grounding grid surge impedance testing method based on artificial short-circuit test

Abstract

The invention provides a converter station grounding grid surge impedance testing method based on an artificial short-circuit test. The method includes the following steps that firstly, measuring equipment is selected according to the practical converter station conditions such as the surge current range and the surge voltage range; secondly, a signal sampling point where the surge current and the surge voltage are measured is arranged on a converter station grounding switch, the measuring equipment is arranged in corresponding protective chambers, and a surge voltage reference zero-potential point is arranged in the position with a proper distance away from a grounding grid of a converter station; thirdly, according to the measured converter station direct-current line condition, artificial short-circuit test points meeting safety conditions are selected, and grounding frame suspension preparatory work is conducted before the artificial short-circuit test. By the adoption of the method, the characteristic that a direct-current transmission system can form a ground current loop is fully utilized, the large surge current is provided through the transmission system, the problem that the large surge current is difficult to provide on the scene is solved, and the truth of surge grounding impedance is reflected.

Description

technical field [0001] The invention relates to a grounding grid impact impedance testing method, in particular to a converter station grounding grid impact impedance testing method based on an artificial short-circuit test, which is suitable for measuring grounding grid characteristic parameters during the commissioning stage of a converter station or when there is a special need, and belongs to the power system The field of measuring the characteristic parameters of the grounding grid. Background technique [0002] The impact grounding impedance is the impedance of the grounding device to the remote zero potential under the action of the impact current, and the value is the ratio of the potential difference between the grounding device and the remote zero potential to the impact current through the grounding device into the ground. In the industry standard DL / T 266-2012 Grounding Device Impulse Characteristic Parameters Test Guidelines, relevant provisions are made on some...

AI Technical Summary

Problems solved by technology

This method directly utilizes the DC transmission characteristics of the converter station, uses the DC grounding network of the converter station as the ground electrode to form a single-pole ground loop or a double-pole ground loop, and provides a large impact current into the ground, which solves the problem that it is difficult to obtain a large impact current on site. question

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