CN223784391U - Drive the inter-line insulation test circuit - Google Patents

Abstract

This invention provides a circuit for testing the insulation between test lines, including a first test lead, a second test lead, and 32 test components. Each test component includes a test node, a first channel switch, and a second channel switch. The test node is connected to both the first and second channel switches. The two ends of the first channel switch are connected to the test node and the first test lead, respectively, and the two ends of the second channel switch are connected to the test node and the second test lead, respectively. The first test lead is connected to the E terminal of an insulation resistance meter, and the second test lead is connected to the L terminal of the insulation resistance meter. Compared with the manual winding test method, this technical solution, without affecting the test standards, omits the originally cumbersome process using reusable front-end equipment, saving time.

Description

Insulation test circuit between drive acquisition lines

Technical Field

The utility model relates to the technical field of insulation test of drive acquisition wires, in particular to an insulation test circuit between drive acquisition wires.

Background

In the process of construction and acceptance of a new line of a railway signal system, in order to ensure that a line is started on time, a static acceptance test, an interlocking acceptance test and a continuous hanging test are usually completed in a short time, and the time is urgent and the task is heavy. The test environment is changeable and uncontrollable, and can be outdoor, in a tunnel, indoor or in a powerless environment.

In a railway signal system, a large number of signal cables are used, and the cables are in different use scenes such as indoor, outdoor, signal cable trenches, ballast and the like, can be influenced by various environmental factors, time aging, poor connection and the like, so that the insulation performance of the cables is reduced, the safe operation of railway signal equipment is influenced, and insulation test needs to be carried out on various signal cables at regular time.

The traditional insulation test method uses a megohmmeter (insulation tester) to output 500V high-voltage power, and the high-voltage power is added between two points to be measured to obtain an insulation resistance value. The method is suitable for manual spot testing, but needs to frequently switch the spot testing wire harness objects, and also needs to perform winding short circuit testing in a plurality of wires, and is not suitable for 32-bit drive acquisition wires or multi-bit wire insulation testing.

In the past test process, when a tester performs test driving to collect insulation between wires, the terminal of the aviation plug is wound and connected in series by a copper wire to perform insulation test, and the terminal is re-wound and repeated when the next test is verified, so that the process is tedious and tedious, and a large amount of time is consumed for winding the copper wire.

Disclosure of utility model

In view of the above, the present utility model aims to provide a drive acquisition line-to-line insulation test circuit, which omits the original redundant process with a reusable front-end device on the basis of not affecting the test standard, and saves time compared with the manual winding test method.

The insulation test circuit comprises a first test line, a second test line and 32 test assemblies, wherein each test assembly comprises a test node, a first channel switch and a second channel switch, the test nodes are respectively connected with the first channel switch and the second channel switch, two ends of the first channel switch are respectively connected with the test nodes and the first test line, two ends of the second channel switch are respectively connected with the test nodes and the second test line, the first test line is connected with an E end of an insulation resistance meter, and the second test line is connected with an L end of the insulation resistance meter.

In a preferred embodiment, the test node is used to connect a cable under test.

In a preferred embodiment, the insulation resistance meter is embodied as a ZC25B-3 insulation resistance meter.

Compared with the manual winding test method, the utility model has the advantages that the repeated front-end equipment omits the original redundant process and saves time on the basis of not influencing the test standard.

Drawings

FIG. 1 is a schematic circuit diagram of a preferred embodiment of the present utility model;

FIG. 2 is a schematic diagram of a connection in which all nodes are not shorted in a preferred embodiment of the utility model;

FIG. 3 is a schematic illustration of the connection of the dial to node 1, of a short circuit between nodes 3 and 4 in accordance with a preferred embodiment of the present utility model;

FIG. 4 is a schematic diagram of a 3-node shorted connection in accordance with a preferred embodiment of the utility model;

fig. 5 is a schematic diagram of the connection of the short circuit between 3 nodes and 4 nodes according to the preferred embodiment of the present utility model.

Detailed Description

The utility model will be further described with reference to the accompanying drawings and examples.

It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terms used herein are merely used to describe specific embodiments and are not intended to limit exemplary embodiments in accordance with the present application, and as used herein, singular forms are intended to include plural forms unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they refer to the presence of features, steps, operations, devices, components and/or combinations thereof.

Referring to fig. 1-5, an insulation test circuit between drive acquisition lines comprises a first test line, a second test line and 32 test assemblies, wherein each test assembly comprises a test node, a first channel switch and a second channel switch, the test nodes are respectively connected with the first channel switch and the second channel switch, two ends of the first channel switch are respectively connected with the test nodes and the first test line, two ends of the second channel switch are respectively connected with the test nodes and the second test line, the first test line is connected with an E end of an insulation resistor, and the second test line is connected with an L end of the insulation resistor.

Specifically, the test node is used for connecting a cable to be tested. The insulating resistance meter is specifically a ZC25B-3 insulating resistance meter.

In the test process, the channel switch is switched, so that the insulating relationship between each bit in the 32-bit wire harness and other 31-bit cables can be carried out for each bit. The first test line E end is connected with the No. 1 node, the second test line L end is connected with the No. 2-32 nodes except the No. 1 node, and the line-to-line insulation relationship between the test line E and the test line L is the line-to-line insulation relationship between the test No. 1 node and the No. 2-32 node.

In order to more specifically and intuitively introduce the technical scheme, the drive acquisition line-to-line insulation test circuit of the application is described in the form of a specific drive acquisition line-to-line insulation test instrument:

As shown in FIG. 2, the insulation test circuit between the driving collection wires is arranged in the insulation test instrument between the driving collection wires, the insulation test instrument between the driving collection wires is provided with a drive plate of an engine base, each number on the drive plate corresponds to one test node, and the electrical connection relation between the rotation of the drive plate and the nodes is the prior art and is not repeated here. Fig. 2 shows that under normal conditions, all the test nodes are not shorted, the circuits in the insulation test instrument between the drive acquisition wires are not conducted, and the insulation resistance meter shows high resistance.

It is assumed that the insulation between the nodes No. 3 and No. 4 is poor, a short circuit phenomenon occurs, when the nodes No. 3 and No. 4 are short-circuited, the insulation resistance meter still shows high resistance because of not forming a loop when the engine base driving plate is 1 node, when the nodes No. 3 and No. 4 are short-circuited, the insulation resistance meter still shows low resistance because of forming a loop when the engine base driving plate is 3 node, thus eliminating the short circuit of the node 3, and when the nodes No. 3 and No. 4 are short-circuited, the engine base driving plate is 4 node, and the insulation resistance meter shows low resistance because of forming a loop, thus eliminating the short circuit between the node 3 and the node 4.

The channel combination circuit is switched by switching the machine base driving plate, so that the insulation relation of each line in the 32-bit of the tested cable harness relative to other harnesses is achieved in a short time. Thereby checking the insulation state problem of the cable. Similarly, insulation tests can be performed on different wire harnesses within 32 bits by replacing different plugs and buses according to the wire harnesses.

Compared with the testing method in the prior art, the invention designs a channel switching combined circuit controlled by the engine base driving plate, which is used for sequentially carrying out insulation tests on different wire bundles of the cable to be tested. One end of the invention is connected with a ZC35B-3 type insulation test meter, and the other end is connected with a tested cable. The key points are (1) the circuit design of the invention. (2) a channel switching combination circuit switched by a housing dial. (3) appearance of the device. (4) Different cable devices may be tested by exchanging different plugs and buses.

Compared with the manual winding test method, the device omits the original redundant process by using the front-end equipment which can be repeatedly used on the basis of not influencing the test standard, and saves the time:

(1) According to the previous method for measuring insulation between wires, a test circuit is manufactured in advance and only needs to be connected with an aviation plug for driving the acquisition wire, so that repeated winding on site is avoided.

(2) Two test points are reserved in advance and used for connecting insulation test meters of different types and testing insulation between wires. (i.e. the test standard is the same as the industry standard and does not affect the test accuracy due to the addition of the front end)

(3) The switching channel is used for switching on the circuit according to the requirement, the operation is simple and easy to grasp, the testing procedure is simplified, and most people can easily complete the test.

(4) The scheme in the insulation test device (2024102360522) is that the insulation test module is driven by a power supply to meet the test requirement. However, the equipment is often in an outdoor or powerless environment in a use scene, and a railway electrical system has used a ZC25B-3 type insulation resistance meter (without a power supply) on a large scale, and in the powerless environment, the equipment has the advantages of small volume, low cost, easy use, flexible test objects and maintenance of the original industry test standard.

(5) The plug and the bus are replaced to achieve insulation test of other cable equipment. The insulation test device is designed for a 32-bit interlocking system driving acquisition line, but insulation test can be carried out on different devices by replacing different wire harness plugs or quick connection for cable electrical devices below 32 bits.

Claims (3)

1. A circuit for driving and acquiring inter-line insulation testing, characterized in that it includes a first test line, a second test line, and 32 test components; each test component includes a test node, a first channel switch, and a second channel switch; the test node is connected to the first channel switch and the second channel switch respectively; the two ends of the first channel switch are connected to the test node and the first test line respectively, and the two ends of the second channel switch are connected to the test node and the second test line respectively; the first test line is connected to the E terminal of an insulation resistance meter, and the second test line is connected to the L terminal of the insulation resistance meter. 2. The drive acquisition line insulation test circuit according to claim 1, wherein the test node is used to connect the cable under test. 3. The insulation test circuit between drive acquisition lines according to claim 1, wherein the insulation resistance meter is specifically a ZC25B-3 type insulation resistance meter.