Circuit for testing insulation between driving acquisition lines

Abstract

The utility model provides an inter-line insulation test circuit for driving acquisition lines. The inter-line insulation test circuit comprises a first test line, a second test line and 32 test assemblies, each test assembly comprises a test node, a first channel switch and a second channel switch; the test node is respectively connected with the first channel switch and the second channel switch; two ends of the first channel switch are respectively connected with a test node and a first test line, and two ends of the second channel switch are respectively connected with the test node and a second test line; the first test line is connected with the E end of the insulation resistance meter, and the second test line is connected with the L end of the insulation resistance meter. Compared with a manual winding test method, the technical scheme has the advantages that on the basis of not influencing the test standard, the original redundant technical process is omitted by the reusable front-end equipment, and the time is saved.

Description

Technical Field

[0001] This utility model relates to the field of insulation testing technology for drive acquisition lines, and in particular to insulation testing circuits between drive acquisition lines. Background Technology

[0002] During the construction and acceptance process of new railway signaling systems, the electrical engineering system often completes static acceptance, interlocking acceptance, and connection tests within a short period of time to ensure the line opens to traffic on schedule. The time is tight and the task is heavy. One of the acceptance items is to test the insulation relationship of the signaling equipment cables. The test environment is variable and uncontrollable, and may be outdoors, in tunnels, indoors, or in environments without power.

[0003] In railway signaling systems, a large number of signal cables are used. These cables are located in different environments, such as indoors, outdoors, in signal cable trenches, and under rubble. They are affected by various environmental factors, aging over time, and poor connections, which leads to a decline in the insulation performance of the cables and affects the safe operation of railway signaling equipment. Therefore, it is necessary to conduct insulation tests on various types of signal cables regularly.

[0004] Traditional insulation testing methods use a megohmmeter (insulation tester) that outputs 500V high voltage, applied between the two points to be measured, to obtain the insulation resistance value. This method is suitable for manual point testing, but it requires frequent switching of the test harness, and multiple line-to-line tests also require winding short-circuit testing, making it unsuitable for 32-bit drive acquisition lines or multi-digit line-to-line insulation testing.

[0005] In the past testing process, when testers were conducting insulation tests on the test drive acquisition lines, they would connect the terminals of the aviation plugs with copper wire to perform insulation tests. When verifying the next line, they would have to repeat this step, which was not only tedious and boring, but also time-consuming because winding copper wire took a lot of time. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a driving acquisition line insulation test circuit. Compared with the manual winding test method, it eliminates the originally complicated process and saves time by using reusable front-end equipment without affecting the test standards.

[0007] To achieve the above objectives, this utility model adopts the following technical solution: a drive acquisition line-to-line insulation test circuit, including 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 the insulation resistance meter, and the second test line is connected to the L terminal of the insulation resistance meter.

[0008] In a preferred embodiment, the test node is used to connect the cable under test.

[0009] In a preferred embodiment, the insulation resistance meter is specifically a ZC25B-3 type insulation resistance meter.

[0010] Compared with the prior art, the present invention has the following advantages: compared with the manual winding test method, without affecting the test standards, the original complicated process is omitted by using reusable front-end equipment, thus saving time. Attached Figure Description

[0011] Figure 1 This is a circuit schematic diagram of a preferred embodiment of the present invention;

[0012] Figure 2 This is a schematic diagram showing a preferred embodiment of the present invention where all nodes are not short-circuited.

[0013] Figure 3 This is a schematic diagram of the connection between node 1 and node 2 when the 3rd and 4th nodes are short-circuited in a preferred embodiment of the present invention.

[0014] Figure 4 This is a schematic diagram of a 3-node short circuit connection in a preferred embodiment of the present invention;

[0015] Figure 5 This is a schematic diagram of the short circuit connection between nodes 3 and 4 in a preferred embodiment of the present invention. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, 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 pertains.

[0018] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application; as used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise; furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0019] refer to Figure 1-5 The circuit drives the inter-line insulation test circuit, 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 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 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 the insulation resistance meter, and the second test lead is connected to the L terminal of the insulation resistance meter.

[0020] Specifically, the test node is used to connect the cable under test. The insulation resistance meter is specifically a ZC25B-3 type insulation resistance meter.

[0021] During testing, switching the channel switch allows for the determination of the insulation relationship between each bit in the 32-bit harness and the other 31-bit cables. The first test line (E) is connected to node 1, and the second test line (L) is connected to nodes 2-32 (excluding node 1). Testing the insulation relationship between E and L is equivalent to testing the insulation relationship between node 1 and nodes 2-32.

[0022] To provide a more concrete and intuitive explanation of this technical solution, the following description of the drive acquisition line insulation test circuit of this application will be presented in the form of a specific drive acquisition line insulation test instrument:

[0023] like Figure 2 As shown, the insulation test circuit between the drive acquisition line is placed in the insulation test instrument between the drive acquisition line; the insulation test instrument between the drive acquisition line has a base dial, and each number on the dial corresponds to a test node; the electrical connection between the dial rotation and the node is existing technology and will not be described here. Figure 2 The demonstration shows that under normal circumstances, all test nodes are not short-circuited, the internal circuit of the insulation tester between the drive acquisition lines is not conductive, and the insulation resistance meter shows a high resistance.

[0024] Assume poor insulation between nodes 3 and 4, resulting in a short circuit; refer to Figure 3 When nodes 3 and 4 are short-circuited, and the base dial is moved to node 1, the insulation resistance meter still shows a high resistance because a circuit is not formed; (Reference) Figure 4 When nodes 3 and 4 are short-circuited, the base dial is set to node 3, forming a circuit. Therefore, the insulation resistance meter still shows a low resistance, indicating a short circuit at node 3. (Reference) Figure 5 When nodes 3 and 4 are short-circuited, the base dial is turned to node 4. Because a loop is formed, the insulation resistance meter shows a low resistance. Therefore, it was found that there is a short circuit between nodes 3 and 4.

[0025] By switching the dial on the base, the channel combination circuit can be switched, allowing for a short-term assessment of the insulation relationship between each wire in the 32-bit cable harness under test and the other wires. This helps to troubleshoot cable insulation issues. Similarly, by changing different plugs and busbars for different wire harnesses, insulation testing can be performed on different wire harnesses up to 32 bits.

[0026] Compared with existing testing methods, this invention designs a channel switching combination circuit controlled by a base dial, used to sequentially perform insulation tests on different wire bundles of the cable under test. One end of the invention is connected to a ZC35B-3 type insulation tester, and the other end is connected to the cable under test. The key points are: (1) the circuit design of this invention. (2) the channel switching combination circuit controlled by a base dial. (3) the appearance of the equipment. (4) different cable equipment can be tested by changing different plugs and buses.

[0027] Compared to manual winding testing methods, this equipment eliminates the previously cumbersome process and saves time by using reusable front-end devices without affecting testing standards.

[0028] (1) Based on the previous method of measuring the insulation between lines, the test circuit is prepared in advance. It only needs to be connected to the aviation plug of the drive acquisition line to avoid repeated winding on site.

[0029] (2) Reserve two test points in advance for connecting different models of insulation testers and testing the insulation between the leads. (That is, the test standard is the same as the industry standard, and the test accuracy will not be affected by the addition of the front end.)

[0030] (3) Switch the channel to connect the circuit as needed. The operation is simple and easy to master, simplifying the testing process and allowing most people to easily complete the test.

[0031] (4) No external power supply is required to drive the equipment: The solution in one insulation testing device [2024102360522] is to drive the insulation testing module with a power supply to meet the testing requirements. However, this equipment is often used outdoors or in environments without power. In addition, the railway electrical system has already widely adopted the ZC25B-3 insulation resistance meter (which does not require a power supply). In environments without power, this equipment has the advantages of small size, low cost, ease of use, flexible testing objects, and maintenance of the original industry testing standards.

[0032] (5) Replace the plug and bus to perform insulation tests on other cable equipment. Although this equipment is designed for insulation testing of 32-bit interlocking system drive acquisition lines, insulation tests can be performed on cable electrical equipment with fewer than 32 bits by replacing different wire harness plugs or quick connectors.

Claims

1. A circuit for driving and acquiring insulation testing between wires, characterized in that, It includes 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 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 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 the insulation resistance meter, and the second test lead is connected to the L terminal of the insulation resistance meter.

2. The insulation test circuit between drive acquisition lines according to claim 1, characterized in that, The test node is used to connect the cable under test.

3. The insulation test circuit between drive acquisition lines according to claim 1, characterized in that, The insulation resistance meter mentioned is specifically the ZC25B-3 type insulation resistance meter.

Images