Remnant electric charge releasing device of converter station valve hall

Abstract

The invention relates to a remnant electric charge releasing device of a converter station valve hall. According to the remnant electric charge releasing device, a bus where a valve hall high-voltage polarline point is located and a bus where a valve hall low-voltage polarline point is located are respectively provided with a ground cutter in the single converter station valve hall. The remnant electric charge releasing device is characterized in that a ground cutter is arranged on a connecting bus between an A-phase converter transformer valve side terminal and a C-phase converter transformer valve side terminal of a Y-delta converter transformer set, and a ground cutter is arranged on a bus where a neutral point terminal of a Y-Y converter transformer set is located. According to the remnant electric charge releasing device, eight ground cutters in a valve hall in the prior art are reduced to four ground cutters, and the total engineering investment is saved. A side wall type is adopted in the ground cutters arranged in the Y-Y converter transformer set and the Y-delta converter transformer set, accidents of operating personnel when maintaining and detecting are carried out in the valve hall are avoided and the valve hall electric arrangement is optimized while the needed electric distance and structural requirements are met. The remnant electric charge releasing device can be widely applied to the field of high-voltage and direct-current transmission.

Description

technical field [0001] The invention relates to a residual charge discharge device, in particular to a valve hall of a converter station of a conventional (DC voltage level of ±500kV and below) and UHV (DC voltage level of ±800kV and above) direct current transmission project Residual charge discharge device. Background technique [0002] As a discharge device for the residual charge of live equipment including valve hall converter transformers, the ground knife is widely used in the power system and is an important equipment to ensure the personal safety of operating personnel during equipment maintenance. [0003] Such as figure 1 , figure 2 As shown, a single valve hall of a conventional and UHVDC converter station generally includes a Y-Δ converter transformer group consisting of three single-phase double-winding converter transformers and a Y-Δ converter transformer group consisting of three single-phase double-winding converter transformers Formed Y-Y converter tra...

AI Technical Summary

Problems solved by technology

[0011] Due to the complex wiring of the valve side terminal of the valve hall converter transformer group (Y-Y converter transformer group and Y-Δ converter transformer group), there are many combined air gaps, especially for UHV DC transmission projects, where the voltage level and insulation level are high , the air clearance requirements are strict, such as too many floor knives, which is not conducive to the electrical layout of the valve hall process, nor is it conducive to controlling the cost of engineering equipment

[0012] like image 3 As shown, for the high-end valve hall of the UHV DC transmission project, according to the existing configuration principles of ground blades, subject to the requirements of the air clearance and the structural constraints of the ground blade itself, the grounding of the Y-Y converter transformer group and the Y-Δ converter transformer group The knife can only be buried in the ground, that is, tunnel pits need to be set in the valve hall, which may easily cause safety accidents for operating personnel during maintenance and overhaul in the valve hall

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