A contact force threshold model construction method for judging the occurrence of pantograph-catenary contact arc
A contact arc and threshold model technology, applied in electrical digital data processing, instruments, geometric CAD, etc., can solve problems such as affecting the reliability of pantograph electrical contact, overheating in the contact area, increasing contact resistance and contact point current density, etc.
Active Publication Date: 2022-04-29
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology
Relevant studies have shown that when the pantograph-catenary contact state is not good, the contact force becomes smaller, the contact resistance and the current density of the contact point increase sharply, the contact area will overheat, the conductive spots are melted to form electric sparks and arcs, and affect the reliability of pantograph-catenary electrical contact. sex
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[0041] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. Since the solid surface is always rough and uneven, the actual situation of contact between two solid surfaces microscopically is as follows: figure 1 As shown, the figure shows that the contact between the two surfaces is mainly completed by some contact points. In Holm's electrical contact theory, these contact points are called "a spots". The shapes of these a-spots are varied, among which the circle is the most researched, so the derivation process of the present invention is carried out based on the circular a-spots.
[0042] During the sliding contact between the catenary and the pantograph, the contact current flows from the contact line on the catenary to the pantograph, which is microscopically expressed as the current flowing through the a spot on the contact surface. from figure 1 It can be seen that the a spot is very smal...
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The present invention proposes a contact force threshold model construction method for judging the occurrence of pantograph-catenary contact arc. Firstly, based on the a-spot contact resistance model in the existing Holm electrical contact theory, the assumption of its circular contact spot is considered in combination with the definition of current density to derive contact The relationship between the resistance and the current density of the contact point; then according to the assumption of the circular contact spot in the a-spot contact resistance model, the relationship between the contact resistance and the contact force is obtained, and finally the relationship between it and the current density of the contact point is obtained to determine the bow The contact force threshold model for grid contact arc occurrence. The invention can be used to calculate the contact force threshold and the contact resistance threshold for the occurrence of contact arcs. For the first time, a specific calculation model is given for the impact of contact resistance on pantograph-catenary current flow, and can reveal the specific relationship between contact resistance and pantograph-catenary electrical contact reliability.
Description
technical field [0001] The invention relates to the technical field of electrical contact, in particular to a method for constructing a contact force threshold model for determining the occurrence of pantograph-catenary contact arcs. Background technique [0002] With the high-speed and heavy-duty electrified railways, the pantograph-catenary electrical contact state caused by factors such as catenary irregularities, catenary fluctuations, and pantograph vibrations has deteriorated, and AC arcs have become common in electrified railways. At the same time, pantograph-catenary arc will lead to poor reliability of pantograph-catenary current receiving. According to the theory of electrical contact, the sliding contact between the train pantograph and catenary belongs to sliding electrical contact, and there will be contact resistance between the two, which is the main characterization parameter of the reliability of pantograph-catenary electrical contact. In recent years, in o...
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IPC IPC(8): G06F30/23G06F30/17G06F119/14
Inventor 刘志刚周虹屹
Owner SOUTHWEST JIAOTONG UNIV