CN2760572Y

CN2760572Y - Low-voltage current transformer detecting instrument

Info

Publication number: CN2760572Y
Application number: CN 200420061839
Authority: CN
Inventors: 黄祖坤
Original assignee: CHENGDU XINHANG ELECTRIC MEASUREMENT INSTRMENTATION Co Ltd
Current assignee: CHENGDU XINHANG ELECTRIC MEASUREMENT INSTRMENTATION Co Ltd
Priority date: 2004-10-29
Filing date: 2004-10-29
Publication date: 2006-02-22
Anticipated expiration: 2014-10-29

Abstract

A low-voltage current transformer detecting instrument includes two samplers (1), (2), two sample circuits (3), (4), two converting circuit (5), (6), an SCM circuit (7) and a display circuit (8). The samplers (1), (2) can sample the primary current signal and the secondary current signal from the low-voltage current transformer of an electric supply line which is in the usage state, and signals are respectively transmitted to sample circuits (3), (4), and current signals are converted into voltage signals, and they are transmitted to converting circuits (5), (6). Voltage signals are converted into digital signals, and then they are transmitted to the SCM circuit (7) to make the operation treatment. Thus the ratio difference value of the low-voltage current transformer can be obtained, and it is sent to the display circuit (8) to display. The utility model solves the detection problem of the ratio difference value of the low-voltage current transformer in the running state, and it avoids causing economic loss for the electric supply enterprises. The detection instrument has simple structure and convenient operation, and it is a light, portable detection instrument.

Description

The low-voltage current mutual inductor detector

Technical field

The utility model relates to the mutual inductor detecting instrument, and particularly the low-voltage current mutual inductor detector belongs to the detecting instrument class.

Background technology

Low-voltage current mutual inductor is a kind of device that uses in the supply line, and the mutual inductor in supply line under the user mode does not normally detect.Because installation, transportation or artificial etc. all multifactor, the ratio parameter at operating low-voltage current mutual inductor is had greatly changed, can bring serious economy loss to power supply enterprise, and this problem is to be difficult to find as not detecting.

Summary of the invention

The purpose of this utility model just is to solve the problem that low-voltage current mutual inductor exists under the user mode in the supply line, a kind of low-voltage current mutual inductor detector is provided, realize low-voltage current mutual inductor in supply line under the user mode, the detection that the ratio parameter changes.

The scheme that the utility model technical matters solves is: comprise that sampler 1., 2., sample circuit 3., 4., change-over circuit 5., 6., single chip circuit 7., 8. display circuit constitutes, described sampler 1., 2. the low-voltage current mutual inductor under user mode sampling primary current signal and secondary current signal from supply line, and 3. it be transported to sample circuit respectively, 4., convert current signal to voltage signal, be transported to change-over circuit respectively 5. again, 6., convert voltage signal to digital signal, two paths of signals is transported to single chip circuit 7. carries out calculation process, obtain the ratio changing value of low-voltage current mutual inductor, send into display circuit and 8. show.

This reality has novel beneficial effect to be: solved under the running status low-voltage current mutual inductor than the detection problem of difference, prevented the economic loss that causes to power supply enterprise, this detector is simple in structure, and is easy to operate, is a kind of portable hand-held detector.

Description of drawings

Fig. 1 is the utility model circuit block diagram

Fig. 2 is the utility model circuit theory diagrams

Embodiment

Below in conjunction with accompanying drawing, the description detailed in addition to the utility model:

Shown in the block diagram of Fig. 1, sampler 1., 2., sample circuit 3., 4., change-over circuit 5., 6., single chip circuit 7., display circuit is 8..

Shown in the circuit theory diagrams of Fig. 2, described sampler 1., 2. be sample pickup tongs 1., the 2. low-voltage current mutual inductor under user mode sampling primary current signal and secondary current signal from supply line, be transported to sample circuit respectively 3., 4., described sample circuit is 3. by sample resistance R ₁₀₄, R ₁₁₀, R ₁₀₇Form, to become voltage signal from sample pickup tongs primary current conversion of signals 1., 5. this voltage signal is transported to the A/D change-over circuit, finish by the pin bifurcation BIN5 change-over circuit pin bifurcation BIN connection 5. of connector j1, and convert this voltage signal to digital signal, output to single chip circuit 4 pin SDOC 7. by change-over circuit 6 pin SDOC 5., 4. described sample circuit is made up of sample resistance R4, will be from sample pickup tongs secondary current signal 2., convert voltage signal to, 6. this voltage signal is transported to the A/D change-over circuit, be connected with change-over circuit SAIN 6. by the 1 pin SAIN of connector j3 and finish, and convert this voltage signal to digital signal, by change-over circuit 6 pin SDOA 6., output to 7. 3 pin SDOA of single chip circuit, above-mentioned two ways of digital signals obtains the ratio difference of low-voltage current mutual inductor through single chip circuit calculation process 7., outputs to display circuit by 32～39 pin of single chip circuit PO mouth 7. and 8. shows.

Claims

1, a kind of low-voltage current mutual inductor detector, it is characterized in that comprising sampler (1), (2), sample circuit (3), (4), change-over circuit (5), (6), single chip circuit (7), display circuit (8), described sampler (1), (2), low-voltage current mutual inductor sampling primary current signal and secondary current signal from supply line under the user mode, it is transported to sample circuit (3) respectively, (4), convert circuit signal to voltage signal, again it is transported to change-over circuit (5) respectively, (6), convert voltage signal to digital signal, two paths of signals is transported to single chip circuit (7) carries out calculation process and obtain low-voltage current mutual inductor ratio changing value, send into display circuit (8) and show.