CN212514831U

CN212514831U - Intelligent system for cable fault test

Info

Publication number: CN212514831U
Application number: CN201922088191.2U
Authority: CN
Inventors: 黄雪琼; 王新荣
Original assignee: Fuzhou Youneng Electronic Technology Co ltd
Current assignee: Fuzhou Youneng Electronic Technology Co ltd
Priority date: 2019-11-28
Filing date: 2019-11-28
Publication date: 2021-02-09
Anticipated expiration: 2029-11-28

Abstract

An intelligent system for cable fault testing comprises an AC/DC converter, a DC/DC converter, a control processing module, at least one group of encoder modules and at least one group of multi-channel analog switches; the group of multi-channel analog switches comprises 2 multi-channel analog switches; one side of a signal channel of one multi-channel analog switch is grounded, and the other side of the signal channel is electrically connected with one end of a tested cable through a test connecting wire to form a detection port; one side of a signal channel of the other multi-channel analog switch is grounded, and the other side of the signal channel is electrically connected with the other end of the tested cable through a test connecting wire; the connection point of the multi-channel analog switch and the test connection line is electrically connected with the output end of the DC/DC converter through a pull-up resistor; the encoder module comprises two encoder chips, the binary output ports of the encoder chips are electrically connected with the I/O port of the single chip in sequence, and the encoding input ends of the encoder chips are electrically connected with the detection port in sequence. The utility model has the characteristics of detection efficiency is high.

Description

Intelligent system for cable fault test

Technical Field

The utility model relates to a power detection equipment, in particular to intelligent system is used in cable fault test.

Background

At present, electric power workers mostly adopt a universal meter to detect cable faults, and two persons are required to cooperate during detection, so that point-by-point comparison detection is carried out. Some special devices for cable fault detection work are available in the market at present, but a lot of inconvenience exists in the using process.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing an intelligent system is used in cable fault test has the characteristics that detection efficiency is high.

In order to solve the technical problem, the technical scheme of the utility model is that:

an intelligent system for cable fault testing comprises an AC/DC converter, a DC/DC converter, a control processing module, at least one group of encoder modules and at least one group of multi-channel analog switches; the AC/DC converter is used for converting 220V alternating current voltage into first direct current voltage, and the DC/DC converter is used for converting the first direct current voltage into second direct current voltage for the corresponding module to use; the group of multi-channel analog switches comprises 2 multi-channel analog switches, and control ends of the multi-channel analog switches are electrically connected with the control processing module; one side of a signal channel of one multi-channel analog switch is grounded, and the other side of the signal channel is electrically connected with one end of a tested cable through a test connecting wire to form a detection port; one side of a signal channel of the other multi-channel analog switch is grounded, and the other side of the signal channel is electrically connected with the other end of the tested cable through a test connecting wire; the connection point of the multi-channel analog switch and the test connecting line is electrically connected with the output end of the DC/DC converter through a pull-up resistor so as to receive the second direct-current voltage; and the group of encoder modules comprise two encoder chips, the binary output ports of the encoder chips are electrically connected with the I/O ports of the control processing module in sequence, and the encoding input ends of the encoder chips are electrically connected with the detection ports in sequence.

Preferably, the control processing module comprises a single chip microcomputer and a serial communication circuit, wherein the single chip microcomputer is STM32F407 in model, and is communicated with an upper computer through the serial communication circuit to receive a test instruction and upload test data.

Preferably, the multi-channel analog switch is an 8-channel single-pole single-throw analog switch, and the type of the multi-channel analog switch is ADG 741.

Preferably, the AC/DC conversion model is HA24N10-2539, and the output voltage is 24V.

Preferably, the model of the DC/DC converter is LM 2576-5.0V.

Preferably, the encoder chip is model 74LS 148.

The utility model discloses technical effect mainly embodies in following aspect:

1. by adopting multi-point detection and a matrix algorithm, the fault point of the cable can be quickly determined;

2. the control is convenient and simple, and the remote control can be realized.

Drawings

Fig. 1 is a block diagram of an intelligent system used for cable fault testing in an embodiment.

Reference numerals: 100. a single chip microcomputer; 200. an AC/DC converter; 300. a DC/DC converter; 400. an encoder module; 500. a multi-channel analog switch.

Detailed Description

The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings, so that the technical solution of the present invention can be more easily understood and grasped.

Referring to fig. 1, the present embodiment provides an intelligent system for cable fault testing, which includes an AC/DC converter 200, a DC/DC converter 300, a control processing module, at least one set of encoder modules 400, and at least one set of multi-channel analog switches 500.

The AC/DC converter 200 is used for converting a 220V alternating voltage into a first direct voltage, and the DC/DC converter 300 is used for converting the first direct voltage into a second direct voltage for use by the corresponding module. The model of C/DC conversion is HA24N10-2539, and the output voltage is 24V. The model of the DC/DC converter 300 is LM 2576-5.0V.

The group of multi-channel analog switches 500 comprises 2 multi-channel analog switches 500, and the control ends are all electrically connected with the control processing module. The multi-channel analog switch 500 is an 8-channel single-pole single-throw analog switch, and is of the type ADG 741. One side of a signal channel of one multi-channel analog switch 500 is grounded, and the other side is electrically connected with one end of a tested cable through a test connecting line to form a detection port; one side of a signal channel of the other multi-channel analog switch 500 is grounded, and the other side of the signal channel is electrically connected with the other end of the tested cable through a test connecting line; the connection point of the multi-channel analog switch 500 and the test connection line is electrically connected to the output terminal of the DC/DC converter 300 through pull-up resistors (R1, R2, R3, R4, R5, R6) to receive the second direct current voltage.

One set of encoder modules 400 includes two encoder chips, the encoder chips having a model number of 74LS 148. The binary output port of the encoder chip is electrically connected with the I/O port of the control processing module in sequence, and the encoding input end of the encoder chip is electrically connected with the detection port in sequence.

Preferably, the control processing module includes a single chip microcomputer 100 and a serial communication circuit, the model of the single chip microcomputer 100 is STM32F407, and the single chip microcomputer 100 communicates with an upper computer through the serial communication circuit to receive a test instruction and upload test data.

The working principle is as follows: after the single chip microcomputer 100 receives a test instruction through the serial port communication module, the multi-channel analog switch 500 is controlled to sequentially switch on internal signal channels, after the signal channels are switched on, the voltage state of each detection port is represented by a high level or a low level, namely 1 or 0, the voltage state is converted into a BCD code through the encoder module 400 and is input into the single chip microcomputer 100, in this way, 2(n +1) data can be collected, the single chip microcomputer 100 uploads the data to an upper computer, the upper computer arranges the data into a matrix of 2(n +1) x 2(n +1), and then the matrix is compared with a preset truth table, so that whether the wiring relation of the cable is correct or not can be analyzed.

Of course, the above is only a typical example of the present invention, and besides, the present invention can also have other various specific embodiments, and all technical solutions adopting equivalent replacement or equivalent transformation are all within the scope of the present invention as claimed.

Claims

1. An intelligent system for cable fault testing is characterized by comprising an AC/DC converter (200), a DC/DC converter (300), a control processing module, at least one group of encoder modules (400) and at least one group of multi-channel analog switches (500); wherein the AC/DC converter (200) is used for converting 220V alternating current voltage into first direct current voltage, and the DC/DC converter (300) is used for converting the first direct current voltage into second direct current voltage for the corresponding module to use; the group of multi-channel analog switches (500) comprises 2 multi-channel analog switches (500), and control ends of the multi-channel analog switches are electrically connected with the control processing module; one side of a signal channel of one multi-channel analog switch (500) is grounded, and the other side of the signal channel is electrically connected with one end of a tested cable through a test connecting line to form a detection port; one side of a signal channel of the other multi-channel analog switch (500) is grounded, and the other side of the signal channel is electrically connected with the other end of the tested cable through a test connecting wire; the connection point of the multi-channel analog switch (500) and the test connection line is electrically connected with the output end of the DC/DC converter (300) through a pull-up resistor to receive the second direct current voltage; a group of encoder modules (400) comprises two encoder chips, the binary output ports of the encoder chips are electrically connected with the I/O ports of the control processing module in sequence, and the encoding input ends of the encoder chips are electrically connected with the detection ports in sequence.

2. The intelligent system for cable fault testing according to claim 1, wherein the control processing module comprises a single chip microcomputer (100) and a serial communication circuit, the model of the single chip microcomputer (100) is STM32F407, and the single chip microcomputer communicates with an upper computer through the serial communication circuit to receive test instructions and upload test data.

3. The intelligent system for cable fault testing according to claim 1, wherein the multi-channel analog switch (500) is an 8-channel single-pole single-throw analog switch, and the type of the multi-channel analog switch is ADG 741.

4. The intelligent system for cable fault testing use according to claim 1, wherein the type of the AC/DC conversion is HA24N10-2539, and the output voltage is 24V.

5. The intelligent system for cable fault testing according to claim 1, wherein the model of the DC/DC converter (300) is LM 2576-5.0V.

6. The intelligent system for cable fault testing of claim 1, wherein the encoder chip is of the type 74LS 148.