Installation phase sequence self-identification method for transient wave recording fault indicator

Abstract

An installation phase sequence self-identification method for transient wave recording fault indicators comprises: the transient wave recording fault indicators and a bus zero sequence voltage starting device under the same bus periodically reading time service, and all the transient wave recording fault indicators achieving synchronization of system time and sampling point positions; the transient recording fault indicator circularly storing current and electric field data of each phase; the bus zero-sequence voltage starting device starting triggering wave recording, and all transient wave recording fault indicators under the same bus acquiring current and electric field data; calculating respective current initial phases; taking the current initial phase of the ABC three-phase transientrecording indicator at the lower outlet of the bus as a reference, and respectively comparing the phase differences of the currents of all the other indicators; and determining the phase and the current direction coefficient of the transient recording indicator according to the phase difference. The method is simple to implement and high in efficiency, and is automatically implemented in the whole process through the transient wave recording fault indicator and the main station system without human intervention.

Description

technical field [0001] The invention belongs to the technical field of fault detection of power supply lines of a distribution network, and in particular relates to a phase sequence self-identification method for installation of a transient wave recording fault indicator. Background technique [0002] The determination of small current single-phase ground fault is known as one of the worldwide problems because of its unique characteristics. Transient wave recording fault indicator has been widely used in 10KV power distribution system because of its ability to actively and automatically identify faults such as short circuit and small current single-phase grounding. The fault location system is composed of 3 transient wave recording fault indicators, bus zero-sequence voltage starting device and distribution automation master station. The transient state recording fault indicators are respectively installed on the three phases of power lines A, B, and C. Under normal circums...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a phase sequence self-identification method for the installation of a transient wave recording fault indicator, so as to solve the problem that it is difficult to accurately identify the corresponding line when the transient state wave recording fault indicator proposed in the background technology is installed on site. The complexity of the line makes it difficult to ensure that the current direction of all hanging indicators under the same bus is consistent with the current direction of the current line

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