CN2335149Y

CN2335149Y - Power transformer terminal and polarity tester

Info

Publication number: CN2335149Y
Application number: CN 98211412
Authority: CN
Inventors: 李伟
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-04-22
Filing date: 1998-04-22
Publication date: 1999-08-25
Anticipated expiration: 2008-04-22

Abstract

The utility model relates to a power transformer terminal and polarity tester which comprises a casing, a testing key, a display, a first input jack and a secondary input jack of voltage signals of a transformer, etc. The structure is electrically connected with the transformer terminal and polarity testing circuit in the casing. The first and the secondary electric signals of the transformer in the circuit are respectively amplified from the electric signal of an expandable chip of an SCM and are electrically connected with the input pin of an electrical quantity sensor by controlling the action conversion of a relay. The output signal of the electrical quantity sensor is converted by an A/D converter after matching with a resistor. The utility model is electrically connected with an SCM central processing unit. Subsequently, after being processed by a mathematical model which is arranged in the SCM, the SCM can give the terminal and polarity of the transformer. The device can shorten the testing time and enhance the labor efficiency, and the utility model has high safety.

Description

Power transformer wiring group and polarity measurement instrument

The utility model relates to electric power experiment measuring technology, especially a kind of power transformer wiring group and polarity measurement instrument.

In the existing experimental technique of power transformer wiring group and polarity measurement, generally commonly used is " direct current " method, promptly between each phase of primary side, add transient voltage respectively with dry cell, measure each phase induced voltage direction at secondary side respectively with multimeter, extrapolate the wiring group and the polarity of transformer then; This measuring method is very complicated too, needs two to three people to carry out simultaneously, and owing to add transient voltage with the artificial dry cell of taking, has induced potential, and the experimenter is had certain risk, and the test duration is long, efficiency is low.

The purpose of this utility model be shorten the test duration in order to provide a kind of, raise labour efficiency, power transformer wiring group and polarity time-measuring gauge that security is good.

The purpose of this utility model also can realize by following measure:

A kind of power transformer wiring group and polarity measurement instrument contain power switch, casing etc.; On casing, be provided with and measure button, demonstration and transformer first and second side voltage signal input jack; The measurement button of casing, demonstration and transformer first and second side voltage signal input jack also can be electrically connected with transformer connection group and the polarity measurement circuit in being located at casing; Wherein transformer first and second side voltage signal input jack is established identical two groups totally 12, and wherein each jack of one group is respectively by the relay J in the metering circuit ₁-J ₆Normally opened contact K ₁-K ₆IN with electrical quantity sensor ₁Pin is electrically connected, and each jack of another group passes through relay J respectively ₇-J ₁₂Normally opened contact K ₇-K ₁₂IN with electrical quantity sensor ₂Pin is electrically connected; Relay J ₁-J ₁₂Coil respectively by the electric signal of the PA of extended chip 8255, PC mouth through resistance and triode T ₁-T ₁₂Amplify back control, the OUT pin of electrical quantity sensor is connected with analog to digital converter voltage; Pass through relay J at the OUT of electrical quantity sensor pin ₈Normally opened contact K ₈Respectively with resistance R ₁, R ₂Be electrically connected relay J ₈Coil by the signal of extended chip 8255 through triode T ₈Amplify back control; Extended chip 8255, analog to digital converter are electrically connected with the central micro-processor interface circuit of single-chip microcomputer.

The software of the with good grounds following mathematical model design of storage among the EPROM in single-chip microcomputer central authorities micro-processor interface circuit:

1. condition: AB＞Bc＞Bb, Bb=Cc, Bc=Cb; Result: subtractive polarity Y/Y-12 or △/△-12, and instrument is shown as " 1 ".

2. condition: Bb＞Bc＞AB, Bb=Cc, Bc=Cb; Result: additive polarity Y/Y-6 or △/△-6, and instrument is shown as " 2 ".

3. condition: AB＞Bb, AB＜Cb, Bb=Cc=Bc; The result: subtractive polarity Y/ △-11 or △/Y-11, instrument are shown as " 3 ".

4. condition: AB＞Bb, AB＜Bc, Bb=Cc=Cb; The result: subtractive polarity Y/ △-1 or △/Y-1, instrument are shown as " 4 ".

Wherein A, B, C, a, b, c are transformer first and second side voltage signal, first and second side voltage signal inserts jack during test, select to connect the corresponding relays coil by single-chip microcomputer according to each vector relations of mathematical model, make first and second relevant side voltage signal of its action, can obtain test result.

The utility model has following advantage compared to existing technology:

The utility model is compared in traditional method of testing 2-3 people and can be reduced to 1 people and get final product, and has improved efficiency; Test duration of the present utility model is about 5 minutes, has therefore shortened the test duration; The novel tester of this reality can improve tester's security away from tested transformer in addition.

Concrete structure of the present utility model is provided by the following drawings:

Fig. 1 is a structural representation of the present utility model:

1-wiring group and polarity show 2-wiring group and polarity measurement button

3-overflows and positive and negative demonstration 4-changes and error shows

5-changes and error measure button 6-reset key 7-changes and radix point presets

8-power switch 9-casing

Fig. 2 is transformer connection group of the present utility model and polarity measurement circuit theory diagrams:

The utility model is also incited somebody to action in conjunction with the accompanying drawings, and 1,2 embodiment are described in further detail:

With reference to Fig. 1,2, a kind of power transformer wiring group and polarity measurement instrument contain casing 9 etc.; Be provided with on the panel of casing 9 that wiring group and polarity show 1, wiring group and polarity measurement button 2, overflow and positive and negative demonstration 3, variation and error show 4, variation and error measure button 5, reset key 6, variation and radix point preset 7, power switch 8, on the backboard of casing 9, be provided with transformer first and second side voltage signal input jack; The measurement button of casing 9, demonstration and transformer first and second side voltage signal input jack are electrically connected with transformer connection group and polarity measurement circuit in being located at casing 9; Wherein transformer first and second side voltage signal input jack is established identical two groups totally 12, and wherein each jack of one group is respectively by the relay J in the metering circuit ₁-J ₄Normally opened contact K ₁-K ₈IN with electrical quantity sensor ₁Pin is electrically connected, and each jack of another group passes through relay J respectively ₇-J ₁₂Normally opened contact K ₁-K ₁₂IN with electrical quantity sensor ₂Pin is electrically connected; Relay J ₁-J ₁₂Coil respectively by the PA mouth of extended chip 8255 1,2,4,37,39,40, the electric signal of PC mouth 10,11,13,14,16,17 pin is through resistance and triode T ₁-T ₁₂Amplify back control, the OUT pin of electrical quantity sensor is connected with analog to digital converter voltage; Pass through relay J at the OUT of electrical quantity sensor pin ₈Normally opened contact respectively with resistance R ₁, R ₂Be electrically connected; Relay J A coil is by electric signal control after triode amplifies of 38 pin of extended chip 8255; Extended chip 8255, analog to digital converter are electrically connected with the central micro-processor interface circuit of single-chip microcomputer.

Claims

1. power transformer wiring group and polarity measurement instrument contain power switch (8), casing (9) etc.; On casing (9), be provided with and measure button, demonstration and transformer first and second side voltage signal input jack; The measurement button, demonstration and the transformer first and second side voltage signal input jack that it is characterized in that casing (9) also can be electrically connected with transformer connection group and the polarity measurement circuit in being located at casing (9); Wherein transformer first and second side voltage signal input jack is established identical two groups totally 12, and wherein each jack of one group is respectively by the relay J in the metering circuit ₁-J ₆Normally opened contact K ₁-K ₆IN with electrical quantity sensor ₁Pin is electrically connected, and each jack of another group passes through relay J respectively ₇-J ₁₂Normally opened contact K ₇-K ₁₂IN with electrical quantity sensor ₂Pin is electrically connected; Relay J ₁-J ₁₂Coil respectively by the electric signal of the PA of extended chip 8255, PC mouth through resistance and triode T ₁-T ₁₂Amplify back control, the OUT pin of electrical quantity sensor is connected with analog to digital converter voltage; Pass through relay J at the OUT of electrical quantity sensor pin ₈Normally opened contact K ₈Respectively with resistance R ₁, R ₂Be electrically connected; Relay J ₈Coil by the signal of extended chip 8255 through triode T ₈Amplify back control; Extended chip 8255, analog to digital converter are electrically connected with the central micro-processor interface circuit of single-chip microcomputer.