CN2092107U

CN2092107U - Detector for wrong wiring of watt-hour meter

Info

Publication number: CN2092107U
Application number: CN 91215267
Authority: CN
Inventors: 陆惠德
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-03-29
Filing date: 1991-03-29
Publication date: 1992-01-01

Abstract

The utility model relates to a detector for wrong wiring connection of watt-hour meters. A detecting member is composed of an iron core, inductance coils coupled with the iron core, and circuits formed by that the inductance coils are connected with resistors in series and parallel and a rectification bridge circuit. A 31/2 bit digital voltmeter used as a display unit is respectively connected with the rectification bridge circuit and a phase-sequence testing component composed of diodes, resistors and capacitors through a converting switch. The utility model can detect the polarity of secondary current, the phase of current and voltage and the phase-sequence of voltage, can be used by electric metering personnel, and can conveniently and quickly detect the wiring connection of the watt-hour meters and the power meters which are installed. The unnecessary economic loss caused by the wiring error and the inaccurate measurement can be avoided.

Description

Detector for wrong wiring of watt-hour meter

The utility model relates to a kind of watt-hour meter error connection somascope, thereby is used for investigating thoroughly quickly and effectively that watt-hour meter wiring correctness reaches the purpose of correct metering electricity consumption.

The bigger factory and enterprise of power consumption all adopts mutual inductor access type watt-hour meter at present, by voltage, the Current Transformer Secondary line is connected to watt-hour meter respectively, conventional 24 kinds of possible wiring will appear like this, but wherein have only a kind of wiring correct, therefore, often made a mistake in the wiring in the past, make the watt-hour meter metering inaccurate, cause few meter electricity charge, make national economy lost, yet, also do not have a kind of meter specially can conveniently check out the mistake of wiring up till now, and only utilize 2 or the accurate hodometer of 3 station symbols, with several test methods and test data, analyzed the correctness that could determine wiring by rule of thumb, such wiring check workload is very big.

In order to investigate thoroughly effectively rapidly that watt-hour meter wiring error, the utility model purpose are to design a kind of special portable formula pincerlike meter of surveying secondary current polarity, current/voltage phase place and phase sequence.

The technical solution of the utility model is by pincerlike iron core, telefault with its coupling, in parallel with telefault, resistance in series and rectification bridge circuit are formed test component, existing 3 1/2 bit digital voltage tables are sent out V as display unit on the employing market, it reaches by diode with rectification bridge circuit output terminal respectively by switch, electric capacity, resistance is formed the phase sequence parts and is connected, switch is connected the rectification bridge circuit can survey secondary current polarity, the phase place of current/voltage, when switch was connected the phase sequence parts, the signal voltage that three fixed terminals of tested three-phase voltage and instrument are produced after capacitor phase shift and resistance step-down was handled the back by detector diode and is about to signal and sends into display unit and distinguish phase sequence.

The utility model embodiment is illustrated in conjunction with the accompanying drawings.

Figure is watt-hour meter error connection somascope circuit theory diagrams.

Shown in accompanying drawing, iron core Fe and telefault L1, L2 coupling, L1 connects with R3 with resistance R 2 and associating, L2 is in parallel with resistance R 1, the end of resistance R 1, R3 respectively with form rectification bridge circuit two input ends by D1～D4 and be connected, by iron core Fe, form test component with telefault L1, the L2 of its coupling and resistance R 1～R3 and rectification bridge circuit, as 31/2 bit digital voltage table V of display unit by K switch 1, K2 respectively with the output terminal of rectification bridge circuit and be connected with the phase sequence test part of forming by diode D5, capacitor C 1, resistance R 4～R7.When using this instrument, at first measure the positive reverse direction flow of electric current in the two phase electricity streamline, this available secondary current line is forward and oppositely put into the pincerlike iron core of this instrument respectively, or turn to pincerlike iron core, read the rereading of this instrument, reading is big once show this moment the secondary current line be positive flow to, determine to determine the voltage and current same-phase again after the positive reverse direction flow of electric current, with every phase current is that the single line of forward is put into pincerlike iron core successive test simultaneously with each voltage phase line respectively, maximum single reading shows that this line current and this line voltage are same-phase in three readings, at last, the measuring voltage phase sequence, to indicate Huang, green, the A of three red phase lines and the phase sequence test part of this instrument, B, C three end points join successively, make K1, K2 switch connection phase sequence test part, write down meter sense, and then with red, green, yellow order connects A successively, B, C three ends are write down meter sense again, rereading relatively, what reading was little once is positive phase sequence, if reading is little for the first time, then show Huang, green, red is positive phase sequence, just record secondary current, reverse direction flow, the current/voltage phase place, phase sequence just can find correct wiring, thereby for the rapid correctness of checking out former wiring, accuracy reaches 100%.

The utility model is the multi-functional measurement instrument that a kind of industry metrological personnel of powering uses, use this instrument to check easily rapidly, can avoid being forbidden to cause unnecessary economic loss owing to wiring error makes metering to the watt-hour meter of being installed, the wiring of power meter.

Claims

1, a kind of watt-hour meter error connection somascope, it is characterized in that, iron core Fe and telefault L1, L2 coupling, L1 connects with resistance R 3 with resistance R 2 backs in parallel, L2 is in parallel with resistance R 1, the end of resistance R 1, R3 is connected with two input ends of the rectification bridge circuit of being made up of D1～D4 diode, is connected with the phase sequence test part of being made up of diode D5, capacitor C 1, resistance R 4～R7 with two output terminals of rectification bridge circuit respectively by K switch 1, K2 as 31/2 bit digital voltage table of display unit.