Single-terminal failure wave-recording and distance-measuring device facing single space in transformer substation

Abstract

The invention relates to a single-terminal accurate failure wave-recording and distance-measuring device facing a single space in a transformer substation, which belongs to the field of electric power systems, and comprises a signal conversion conditioning module, a traveling wave starting and data acquisition module and a data processing and man-machine interface module which are sequentially connected, wherein the traveling wave starting and data acquisition module discriminates whether a failure occurs according to voltage signals input by the signal conversion conditioning module; if the traveling wave starting and data acquisition module discriminates that a failure occurs, the traveling wave starting and data acquisition module starts failure wave recording data and transfers the failure wave recording data to the data processing and man-machine interface module; and the data processing and man-machine interface module reads the data from the traveling wave starting and data acquisition module and receives GPS signal input and switching value signal input to complete data conversion analysis and realize accurate failure distance measuring. The device is designed to face the single space structure and has simple structure and strong field application flexibility; the traveling wave and low-frequency signal acquisition are uniformly designed on one module; and the device high stability and great reduction of cost.

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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