Isolation pillar type lightning arrester for electrified railway

Abstract

A lightning arrester is arranged at the inner bottom of a hollow isolation pillar, a flow limiting acting mechanism is arranged at the upper end of the lightning arrester, the upper end of a conducting rod arranged in the isolation pillar is inserted into the upper end of the isolation pillar, and the lower end of the conducting rod is connected with the flow limiting acting mechanism. And quartz sand is filled at the upper part in the isolation support column. The lightning arrester overcomes the problems that an opening distance is increased due to the fact that an existing lightning arrester for the electrified railway contact network needs to be matched with a disconnector in the installation and operation process, metal connecting wires exist after insulation supporting and disengagement, and free swing can be generated under wind power, the insulation margin is large, the tolerance time is long, and the safety is high. And normal operation of the overhead line system without a grounding fault is ensured.

Description

technical field [0001] The invention relates to a surge arrester, in particular to an isolation pillar type surge arrester for electrified railways. Background technique [0002] At present, due to the wide coverage of railway electrification, especially the rapid popularization of high-speed railway EMUs, the requirements for the reliability of power supply of electrified railway catenary are getting higher and higher. As a lightning arrester for catenary overvoltage protection equipment, its protection level and capability play an important role in the normal operation of the catenary due to the use of a gapless structure. However, because there is no gap, there is the accumulation effect of aging, overvoltage and impact energy. When it reaches a certain level, the resistance sheet inside the arrester will have a collapse effect under electrical stress and thermal stress, resulting in the failure of the arrester. Because there is no gap, the catenary will be grounded here...

AI Technical Summary

Problems solved by technology

However, because there is no gap, there is an accumulation effect of aging, overvoltage and impact energy. When it reaches a certain level, the resistor inside the arrester will collapse under electrical stress and thermal stress, causing the arrester to fail.

Because there is no gap, it will cause the catenary to be grounded here, causing the power supply of the catenary to fail and malfunction

At present, although some measures have been taken, such as installing disconnectors, etc., it is necessary to form sufficient spacing and withstand the corresponding insulation requirements, which makes the structure and construction relatively complicated, and there are metal connections after disconnection, which will produce Free swing, will directly affect catenary lines

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