Large-scale protective resistor for direct-current high-voltage generator

Abstract

The invention discloses a large-scale protective resistor for a direct-current high-voltage generator. The device comprises an epoxy resin insulating cylinder of which the length is not less than 10m.A resistance wire is wound on the epoxy resin insulating cylinder; the epoxy resin insulating cylinder is divided into at least three sections at equal intervals; two ends of each section of epoxy resin insulating cylinder are respectively provided with a flange interface; the head end and the tail end of the resistance wire wound on each section of epoxy resin insulating cylinder are respectively connected with flange interfaces at two ends; the three sections of epoxy resin insulating cylinders are connected in series through flanges; grading rings are respectively arranged at two ends of each section of epoxy resin insulating cylinder. The grading rings are arranged on the protective resistor, so that the potential and electric field distribution of the protective resistor along the surface can be obviously improved. The external insulation flashover of the protective resistor is prevented, and the external insulation flashover on the surface of the protective resistor is preventedfrom endangering the safe operation of power equipment.

Description

technical field [0001] The invention relates to a large-scale protective resistor for a DC high voltage generator. Background technique [0002] In the debugging process of my country's UHV AC engineering system, the impact of the pre-applied DC voltage on the gas gap impulse discharge characteristics is worth considering. In order to study the influence of superimposed residual DC voltage and impulse voltage on UHV GIS busbar insulation, it is necessary to carry out DC superimposed impulse voltage test. Therefore, it is necessary to study and design the DC superimposed impulse test circuit of UHV voltage level. [0003] For the DC superimposed impulse voltage test, two voltages are required to be applied to the test object at the same time, so the test circuit should be specially designed. A protective resistor is added between the test objects. Since the residual inductance and parasitic capacitance of the actual resistance structure will affect the voltage distribution ...

AI Technical Summary

Problems solved by technology

Since the residual inductance and parasitic capacitance in the actual resistance structure will affect the voltage distribution of the resistance, during the DC superimposed impulse voltage test of the protection resistance, the external insulation flashover may occur on the protection resistance surface, which will affect the safe operation of the equipment

Therefore, the traditional protection resistor obviously cannot meet the needs of the UHV transmission line DC superimposed impulse voltage test, especially the ±900 kV DC superimposed ±2400 kV lightning or ±1800 kV operating impulse voltage test. Optimize the design of the structure of the protection resistor, and select the optimal protection resistor structure

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