CN201576057U

CN201576057U - Automatic calibration equipment for residual current operated protective devices

Info

Publication number: CN201576057U
Application number: CN2009201892392U
Authority: CN
Inventors: 曾锡山
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-09-21
Filing date: 2009-09-21
Publication date: 2010-09-08
Anticipated expiration: 2019-09-21

Abstract

The utility model provides automatic calibration equipment for residual current operated protective devices, which consists of a computer with control software inside, a single chip microcomputer, a 50 Hz sine-wave generator, a digital-to-analogue converter, a current amplifying circuit and a phase control circuit. The automatic calibration equipment has the advantages that 1, the automatic calibration equipment is high in efficiency and can simultaneously detect pluralities of residual current operated protective devices, 2, the automatic calibration equipment is high in detection precision, and fiducial error thereof is smaller than or equal to 0.2%, and 3, the automatic calibration equipment is low in labor intensity, convenient for managing and inquiring detection data and high in automation degree. In addition, the automatic calibration equipment is a perfect product for action characteristic detection of combined type residual current operated protective devices in electric power sectors or residual current operated protective device manufacturing factories and rural low-voltage power grids.

Description

The automatic check device of RCD

Technical field: the utility model relates to a kind of automatic check device of electronics calibration equipment, particularly a kind of RCD.

Background technology: can operate as normal for guaranteeing RCD, under the situation that electric leakage takes place, can cut off the electricity supply reliably rapidly, must find the RCD of cisco unity malfunction as soon as possible, and keep in repair in time or change.Therefore, the electrician must regularly detect RCD.The calibration equipment of existing RCD mainly contains: 1, at the phase line inlet wire and the zero line leading-out terminal series resistor of RCD, produce the simulation leakage current, make the RCD action; 2, use normalized current source simulation leakage current to deliver to RCD (timer picks up counting simultaneously) and make its action.The deficiency of these two kinds of device existence in use is: 1, efficient is low, this is that they only have one to detect the station end points, only can detect a RCD, in the place that a plurality of RCDs are arranged, need go one by one to detect, expend time in; 2, accuracy of detection is low, and generally all greater than 0.5%, this is that they are subject to the influence of supply voltage, institute's crosstalk resistance resistance size and operating personnel's manual setting; 3, big, inconvenient management of data of labour intensity and inquiry, because detect data by manual record, not only labor intensity of operating personnel is big for this, and the data of manual record inconvenience management and inquiry.

Summary of the invention: the purpose of this utility model is the deficiency at the calibration equipment existence in use of existing RCD, and a kind of efficient height is proposed, accuracy of detection is good and the automatic check device of the RCD that automaticity is strong.

Can realize the purpose of this utility model by following technical proposals, a kind of automatic check device of RCD, it is characterized in that it is made up of interior computing machine, single-chip microcomputer, 50Hz sine-wave generator, digital to analog converter, current amplifier circuit, the phase-control circuit of establishing Control Software; In establish Control Software computing machine be electrically connected with single-chip microcomputer, single-chip microcomputer is electrically connected with digital to analog converter and phase-control circuit respectively, phase-control circuit also is electrically connected with 50Hz sine-wave generator and digital to analog converter again respectively, and current amplifier circuit is electrically connected with digital to analog converter, single-chip microcomputer and detection station end points respectively.

Detect number 〉=1 of station end points.

To detect data printable in order to make, in establish Control Software computing machine be electrically connected with printer.

Effect of the present utility model is: 1, efficient height, and this is that it is provided with a plurality of detection stations greater than 1, in the place that a plurality of RCDs are arranged, can detect simultaneously a plurality of RCDs, can save the plenty of time; 2, accuracy of detection height, fiducial error≤0.2%, this is that this device is provided with digital precision constant current source, it is made up of digital to analog converter, phase-control circuit and 50Hz sine-wave generator, it makes the output verification electric current is digital quantity, thereby overcome the error that traditional resistance-type residual current generator manually-operated is produced from principle, output current resolution is 1/256 (the Current Regulation fineness reaches 0.05%), accuracy reaches 0.2% (fiducial error), has output verification electric current resolution height, good evenness, characteristics such as precision height; 3, labour intensity low, detect data and be convenient to management and inquiry, the automaticity height, this is that this device establishes the computing machine of Control Software in being provided with, and not only whole testing process is by computer control, and detect finish the back automatically storage detection data, generate examining report etc. automatically, therefore, it has greatly improved work efficiency, alleviates staff's labour intensity, has guaranteed that testing result accurately and reliably, simultaneously, convenient management and inquiry.It is power department or RCD manufacturer, the ideal product that combined type aftercurrent action protecting equipment acting characteristic detects in the rural low voltage network.

Below in conjunction with drawings and Examples the utility model is further set forth:

Description of drawings:

Accompanying drawing 1 is the utility model electrical block diagram.

Embodiment:

Referring to accompanying drawing 1, a kind of automatic check device of RCD, it mainly is made up of interior computing machine 1, single-chip microcomputer 2,50Hz sine-wave generator 5, digital to analog converter 3, current amplifier circuit 6, the phase-control circuit 4 of establishing Control Software.The Control Software of establishing in the computing machine 1 is according to requirements such as vertification regulation JJG843-2007, JB/T9392-1999, GB6829-1995 and design; its function is: the calculating, the generation, synthetic that solve precision constant current source; key technical problems such as open circuit signaling from motion tracking up-flow signal and each worktable position; utilize the least error control technology, realize many detections station of aftercurrent action protecting equipment acting characteristic, High Precision Automatic detection.Precision constant current source is made up of through being electrically connected digital to analog converter 3, phase-control circuit 4 and 50Hz sine-wave generator 5.The circuit of device connects: computing machine 1 is electrically connected with single-chip microcomputer 2, single-chip microcomputer 2 is electrically connected with digital to analog converter 3 and phase-control circuit 4 respectively, phase-control circuit 4 also is electrically connected with 50Hz sine-wave generator 5 and digital to analog converter 3 again respectively, and current amplifier circuit 6 is electrically connected with digital to analog converter 3, single-chip microcomputer 2 and detection station end points respectively.Detecting the station end points and be 6 (detects the station end points according to designing requirement, can be 1 or greater than any natural number more than 1.), they respectively with RCD 7 in the corresponding electrical connection of 6 RCD A-F.For making the detection data printable, computing machine 1 is electrically connected with the printer (not shown).

Claims

1. the automatic check device of a RCD is characterized in that, it is made up of interior computing machine, single-chip microcomputer, 50Hz sine-wave generator, digital to analog converter, current amplifier circuit, the phase-control circuit of establishing Control Software; In establish Control Software computing machine be electrically connected with single-chip microcomputer, single-chip microcomputer is electrically connected with digital to analog converter and phase-control circuit respectively, phase-control circuit also is electrically connected with 50Hz dextrorotation wave producer and digital to analog converter again respectively, and current amplifier circuit is electrically connected with digital to analog converter, single-chip microcomputer and test station end points respectively.

2. by the automatic check device of the described RCD of claim 1, it is characterized in that the number of test station end points 〉=1.

3. by the automatic check device of claim 1 or 2 described RCDs, it is characterized in that, in establish Control Software computing machine be electrically connected with printer.