The Development Of Intelligent Grounding Device Conduction Detector

Grounding device on-advantages and disadvantages of performance and safeoperation of electrical equipment, as well as the personal safety of staff are directlylinked. Grounding resistance of grounding devices eligible or not, not only to meet therequirements, the equipment grounding and earthing connections are reliable, groundingwire to the grounding grid extension for corrosion fracture is even more important. Howto measure and evaluate the conduction properties of the earthing device is powertechnical staff has always been very concerned about the problem.This article first describes the earthing device development and current situation ofdetection method of conduction, in currently available analysis and comparison ofvarious detection methods, combined with characteristics of grounding device of largepower plants, substations itself has developed automatic adjustment test of intelligentearthing current conduction detector. This instrumentation will use the cocurrentswitching power supply to exchange the220V voltage after the rectification, byswitching circuit switching for high frequency current, and low voltage DC rectifier is aquantitative value, measuring the size of the current network interference baseddetection to automatically adjust the size of the current, in order to achieve a certainsignal-to-noise ratio by calculating required measure current value. Device withautomatic constant current, appliance testing, measurement of current output and theresults of processing are controlled by the microcontroller. Final adoption of the displayunit and speech broadcast to present the test results. Through the study of this projectcan improve grounding device of substation, transmission towers and other diagnosticaccuracy, and thus the project’s research has broad application prospects.According to the intelligence grounding breakover instrumentation developmentthought, has carried on the design separately to its hardware electric circuit and thesoftware part.The hardware electric circuit mainly to numerical control direct-currentpower supply module, work power source module, sampling survey module, differenceenlargement unit, A/D transformation unit, control unit and part and so on man-machineconnection unit electric circuit hardware circuit diagrams and the function has carriedon the introduction; The software part union software design flow chart elaborated thedata processing system, the man-machine interaction system, the breakoverperformance distinction system as well as function and so on memory consult systemrealization methods. This topic first is definite the intelligence grounding breakover reflectoscopereflector the measuring technique and the principle, the design development can comefrom according to the interference current moves the adjustment test electric current thegrounding breakover reflectoscope reflector, can enhance the signal-to-noise ratio, theeffective interference elimination electric current to tests the result the influence.Nextdevelopment grounding breakover data analysis software, carries on the synthesis to thetest data the analysis judgment, gives point which possibly appears exceptionally andentire network comprehensive appraisal.