A single-end fault recording and ranging device for single-interval in substation

Abstract

The invention relates to a single-end precise fault recording and ranging device for a single interval in a substation, which belongs to the field of electric power systems. There are three modules of the interface module, among them, the traveling wave start and data acquisition module judges whether a fault occurs according to the voltage signal input by the signal conversion conditioning module. And the man-machine interface module; the data processing and man-machine interface module reads data from the traveling wave start and data acquisition module, and receives GPS signal input and switch signal input, and completes data conversion analysis to realize accurate fault location. The device is designed for a single-compartment structure, with simple structure and strong flexibility in field application; and the traveling wave and low-frequency signal acquisition are uniformly designed on one module, the device has high stability and the cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of power system fault detection, and in particular relates to a single-end fault recording and ranging device for a single interval in a substation. Background technique [0002] According to the power industry standards DL / T553-1994 and DL / T663-1999, substations with a voltage level above 220kV must be installed with a fault recorder. There are two main purposes: 1. The fault recorder can accurately record the substation and the outgoing line. Disturbances and faults that occur can be used to reproduce the fault afterwards, analyze the cause of the accident, and eliminate hidden dangers; 2. The fault recorder has a fault distance measurement function, which is convenient for the on-site electrical engineer to quickly determine the fault point, troubleshoot, and restore power supply. At present, the main fault recorders used in the field can only measure low-frequency signals such as harmonics and power freq...

AI Technical Summary

Problems solved by technology

As long as the substation installs a set of this equipment, it can simultaneously meet the functions of fault recording and traveling wave distance measurement. However, the design and use of this high-precision fault recorder is still oriented to the entire substation, that is, one device is used to monitor the entire substation. All the outgoing lines of the device lack the flexibility of on-site application; especially if the device is abnormal, it will cause the entire substation to lose the safety guarantee of fault recording and ranging, and the reliability of the device performance is poor; and the low-frequency signal acquisition and processing of the device and the operation Wave signal acquisition and processing are separately designed and implemented on different boards, which makes it difficult to balance the rapidity of traveling wave signal startup and the reliability of power frequency signal startup, which affects the reliable startup and recording of the device

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