Roof high-voltage box installation structure

Abstract

A roof high-voltage box installation structure is disclosed. A high-voltage box adopts a glass fiber reinforced plastics top cover. A laminated board is laid on an inner bottom surface of the high-voltage box. An inner surface of the glass fiber reinforced plastics top cover is sprayed with an anti-pollution flashover coating layer. A vacuum main circuit breaker, a voltage transformer, a current transformer, a disconnecting switch, a lightning arrester and three high-voltage cable heads are integrated in the box. A high voltage power supply of a motor train unit is introduced into the high-voltage box by a first high-voltage cable head and is divided into two branches. One branch enters into the voltage transformer. The other branch passes through the vacuum main circuit breaker and then is divided into two branches. One branch is led out by a second high-voltage cable head and the other branch passes through a high-voltage disconnecting switch and is led out by a third high-voltage cable head. The current transformer sleeves the first high-voltage cable head and collects current signals. The lightning arrester, the disconnecting switch and the second high-voltage cable head are connected in parallel. By using the structure of the invention, an influence of an environment on electrical performance of a high voltage component is avoided. Cleaning frequencies are reduced, and manpower and water sources are saved. In addition, an influence of cleaning on the high voltage component is reduced. Discharging performance of an electric appliance is decreased. An insulating plate is laid on the inner bottom surface of the high-voltage box so that an electric clearance between a high voltage wiring point and ground of a high-voltage box body is increased.

Description

technical field [0001] The invention provides an installation structure of a high-voltage box on a vehicle roof. Background technique [0002] The main function of the high-voltage system of the EMU is to obtain single-phase AC25KV high-voltage power from the catenary, to provide power for the train, to realize the main functions of power supply, electrical protection, and monitoring network voltage and working current. Once the high-voltage system of the EMU has a fault such as discharge, it will cause the EMU to be delayed and passengers will be stranded, and it will seriously cause the power supply of the entire catenary to be cut off, thereby affecting the operation of the entire line of vehicles. Therefore, ensuring the safety and reliability of the EMU high-voltage system directly ensures the operation safety of the EMU. [0003] At present, the high-voltage system components of EMUs are mostly installed directly on the roof, directly connected through high-voltage ca...

AI Technical Summary

Problems solved by technology

Therefore, high-voltage components are easily affected by external rain, fog, pollution, airflow, ultraviolet rays and other environments, causing breakdown or discharge, which seriously affects the operation safety of EMUs

Moreover, the outer insulating material of the high-voltage parts of the roof is mostly made of silicone rubber. After the high-voltage parts are contaminated, they must be cleaned and cleaned every time they return to the warehouse. This cleaning will seriously affect the hydrophobicity of the silicone rubber material, which will directly affect the high-voltage Electrical performance of components

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