Digital signal locking type spatial magnetic field detecting system

Abstract

The invention discloses a digital signal locking type spatial magnetic field detecting system, which is composed of an air core coil, a spatial magnetic field signal prefabricating unit, a prefabricating signal generator and a digital locking signal processing unit. The air core coil enables magnetic field signals to be converted into voltage signals which are transmitted to the spatial magnetic field signal prefabricating unit which transmits the signals to the digital locking signal processing unit, the digital locking signal processing unit timely adjusts the spatial magnetic field signal prefabricating unit and the prefabricating signal generator according to signal characteristics so as to form a signal closed loop feedback structure, the digital locking signal processing unit receives and calculates spatial magnetic field signals and prefabricating signals, the spatial magnetic field signals and the prefabricating signals are displayed on a liquid crystal display, a digital / analog converter is driven simultaneously, and analog voltage signals which are proportional to the spatial magnetic field signals are timely output. The digital signal locking type spatial magnetic fielddetecting system is mature in technique and high in reliability.

Description

technical field [0001] The invention belongs to the technical field of space magnetic field detection, in particular to a space magnetic field detection system characterized by digital signal locking. Background technique [0002] When a single-phase ground fault occurs in the distribution network, in order to accurately locate the fault point of the line, people obtain the characteristic information of the fault line by detecting the spatial magnetic field formed by the current in the fault line, so as to judge the fault location of the line. In this fault location technology, accurate acquisition of spatial magnetic field information formed by the current is one of the core technologies for fault location. The existing spatial magnetic field detection technology is to induce a spatial magnetic field signal through an air-core coil, input the signal into a filter, then detect the signal amplitude through an analog circuit, and then display it on a digital tube or a liquid c...

AI Technical Summary

Problems solved by technology

However, this technology has the following disadvantages: (1) The filter used can only filter or extract the signal of a frequency band centered on a certain center frequency point. The measurement of frequency point signals makes it difficult to improve the accuracy of fault location; (2) The signal amplitude analog circuit used can only detect signal amplitude, and cannot provide information such as phase and frequency required in signal detection; (3) The detection used The circuit is an analog circuit, which cannot perform FFT calculation of the signal, and is not convenient for further analysis of the signal; (4) The detection circuit used can only realize the display of the signal amplitude, and cannot be output to other devices for recording and analysis

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