Fault ranging method and device of intelligent station double-circuit parallel transmission line

Abstract

The invention discloses a fault ranging method of an intelligent station double-circuit parallel transmission line. The fault ranging method includes: monitoring running state of the double-circuit line in real time; judging whether a transverse channel / a longitudinal channel of a current line receives data information or not or whether frame error amount of received data information is greater than a threshold value or not; if yes, judging that the transverse channel / the longitudinal channel of the current line is broken; when the longitudinal channel of the current line is broken and the transverse channel of the current line is normal, calling a single-circuit single-end ranging algorithm, otherwise, calling a single-circuit double-end ranging algorithm; when both the transverse channeland the longitudinal channel of the current line are normal and three phases of adjacent lines are disconnected, calling the single-circuit double-end ranging algorithm; when both the transverse channel and the longitudinal channel of the current line are normal and adjacent lines run normally, calling a double-circuit double-end ranging algorithm. The invention further discloses a fault rangingdevice of the intelligent station double-circuit parallel transmission line. The fault ranging method improves ranging adaptability.

Description

technical field [0001] The invention relates to the technical field of electric power system automation, and in particular to a fault distance measuring method for a double-circuit line with an intelligent station on the same pole and a fault distance measurement device for a double-circuit line with an intelligent station on the same pole. Background technique [0002] At present, the fault location of most substations still depends on the distance measurement module of the line protection device itself. The distance measurement principle of the existing single-circuit line protection device is as follows: The distance measurement method based on single-circuit line information can be divided into single-ended measurement Ranging and dual-ended ranging. Among them, the single-ended ranging is mainly based on the method of measuring the reactive component of the positive sequence impedance of the fault circuit; the double-ended ranging is mainly based on the method of calc...

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Problems solved by technology

[0004] For double-circuit lines paralleled on the same pole, there are various operation modes, such as one-time operation, one-time disconnection, one-time operation, one-time hanging on the ground for maintenance, and normal operation of both circuits. In this mode, different ranging schemes need to be adopted, that is, the ranging scheme needs to be self-adapted according to the line operation mode, but the existing double-circuit and double-ended ranging scheme has poor adaptability and low fault location accuracy

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