Method and system for fault positioning of contact net

Abstract

The invention relates to the field of circuit fault detection and provides a method and system for fault positioning of a contact net. The method comprises the steps that currents and electric fields in a circuit of the contact net are sampled by a detector; sampling values of the current and sampling values of the electric filed are sent to a communication terminal; a trigger instruction is sent to the communication terminal when the detector detects that current changes in the contact net satisfy a first preset condition; after the communication terminal receives the trigger instruction, whether a fault takes place in the circuit of the contact net is determined according to the sampling values of the current and the sampling values of the electric field in the contact net which are sent by the detector; fault information is sent to monitoring equipment when the communication terminal determines that the fault takes place in the circuit of the contact net; and the monitoring equipment receives the fault information and determines an occurrence position of the fault in the contact net according to position information of the communication equipment which sends the fault information. The method and system for the fault positioning of the contact net provided by the invention can avoid utilization of travelling wave detection equipment so as to reduce cost; and the method and system are only slightly influenced by differences in manufacturers, models and relevant accessory equipment of the contact net circuit, so that accuracy of the fault positioning is increased.

Description

technical field [0001] The invention relates to the field of circuit fault detection, in particular to a catenary fault location method and system. Background technique [0002] The catenary (such as the catenary of electrified railway) has the characteristics of multiple regions, wide connection range, complex power supply mode, and changeable site environment, which makes it difficult to locate faults. Current line fault location techniques in catenary include traveling wave method. [0003] In the traveling wave method, when a line fault occurs in the catenary, a fault traveling wave will be automatically generated at the fault point. The traveling wave propagates from the mutation point to both ends at a certain speed in the form of electromagnetic waves. The traveling wave is detected by the traveling wave detection equipment installed in the traction substation, and the fault point is determined by the product of the wave velocity and time. The defect of the traveli...

AI Technical Summary

Problems solved by technology

The defect of the traveling wave method in the prior art is that the traveling wave detection equipment is complicated, the price is high, and the installation, commissioning and maintenance costs are high;

Due to the differences in catenary line manufacturers, models and related auxiliary equipment, it is difficult to obtain an accurate line distribution parameter model, resulting in large errors in fault location

Images