Railway traction variable-high voltage grounding switch

Abstract

The invention relates to the field of the high-voltage electrical equipment, especially a railway traction variable-high voltage grounding switch. The railway traction variable-high voltage groundingswitch comprises a grounding switch polar pole, a mounting plate, an operating mechanism, a grounding copper part, a grounding cutter, a conductive copper part, a semi-conductive shielding layer, a semi-conductive buffer layer, and an insulation layer. The grounding switch polar pole and the operating mechanism are located at two sides of the mounting plate; the operating mechanism is matched withthread in the grounding cutter through a lead screw, thereby driving the grounding cutter to make linear motion; the semi-conductive buffer layer is arranged between a conductor and a solid-sealing part of the solid insulation material; the semi-conductive shielding layer is cured at a non-connecting part of the surface of the solid insulation material, and is connected with a shell. The partialdischarge magnitude of the product is lowered, the product life is improved, and the reliability is improved.

Description

technical field [0001] The invention relates to the field of high-voltage electrical equipment, in particular to a high-voltage grounding switch for railway traction transformers. Background technique [0002] With the continuous development of China's economy, railway transportation is playing an increasingly active role in the important means of transportation in China. China's railway construction will enter a golden period, and high-speed rail and bullet trains have become the main means of transportation for travel. The safety and reliability of traction substations that provide power for electrified locomotives are also becoming more and more important. With the advent of the high-speed rail era, they are facing increasingly strong market demand. Railway traction power supply lines implement segmental power supply. When locomotives pass by, the current of this section of the line is relatively large (for example, the current required by the Fuxing bullet train reaches ...

AI Technical Summary

Problems solved by technology

Existing gas insulated switches have large volume and low safety (there are risks of gas leakage, deflagration, etc.)

Solid insulated switchgear has the advantages of small size and no arcing, but it is difficult to control the temperature rise. It is necessary to solve the problem of thermal stress caused by alternating high and low temperatures to prevent insulation failure caused by cracking of the insulating layer.

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