Novel feeder line distance protection method for high-speed trains

Abstract

The invention discloses a novel feeder line distance protection method for high speed trains. The method includes the following steps that: step A, a feeder line distance protection action region is obtained: the feeder line distance protection action region is obtained according to a high-speed train power supply system; step B, a lockout distance protection region is obtained: a minimum overload impedance setting angle phi1, a maximum overload impedance setting angle phi2 and an overload lockout value Zr are found out in the feeder line distance protection action region; and step C, lockout distance protection is performed: a current impedance value Z and a current impedance angle value phi are obtained, lockout distance protection pre-judgment is performed, if the current impedance value Z and the current impedance angle value phi fall in the feeder line distance protection action region, the method shifts to lockout distance protection determination, if the current impedance value Z and the current impedance angle value phi fall in the lockout distance protection region, lockout distance protection is performed, and at this moment, distance protection does not act.

Description

technical field [0001] The invention relates to the field of electrified railways, in particular to a novel feeder distance protection method suitable for high-speed railways. Background technique [0002] At present, the main protection of high-speed railway catenary faults basically adopts the traditional adaptive distance protection. However, the load of high-speed railways is very different from that of traditional ordinary-speed railways. In particular, high-speed railway locomotives adopt the AC-DC power supply mode, which basically does not contain low-order harmonics. When the load is large, the traditional adaptive distance protection cannot distinguish between overload and Faults, many high-speed railways have experienced overload tripping events due to load increases, which has a great impact on the reliability of relay protection. Contents of the invention [0003] The purpose of the present invention is to provide a novel feeder distance protection method sui...

AI Technical Summary

Problems solved by technology

However, the load of high-speed railways is very different from that of traditional ordinary-speed railways. In particular, high-speed railway locomotives adopt the AC-DC power supply mode, which basically does not contain low-order harmonics. When the load is large, the traditional adaptive distance protection cannot distinguish between overload and Faults, many high-speed railways have experienced overload tripping events due to load increases, which has a great impact on the reliability of relay protection

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