Portable intelligent tester for relay contact resistance

Abstract

The utility model discloses a portable intelligent tester for relay contact resistance, which comprises a main control box and a tablet computer, and the main control box internally comprises a tester main control system and an 8454 socket. The tester main control system comprises a main control board MCU, a voltage conversion module, a multipath settable constant current source module, a high-precision voltage measurement module, a relay contact switching module and a wireless module. The main control board MCU controls the wireless module, the contact switching module and the high-precision voltage measurement module. A plurality of external relay contact groups are connected with an internal wiring terminal of the tester master control system through the 8454 socket; the tablet computer is provided with test software and communicates with the tester master control system through the wireless module. The tester can adjust relay contact resistance test current and simulate real resistance under a field application circuit, and is high in test efficiency, simple in data analysis and convenient to carry.

Description

Technical Field

[0001] This utility model belongs to the field of relay testing technology, specifically referring to a portable intelligent relay contact resistance tester. Background Technology

[0002] Contact resistance is one of the main mechanical characteristic parameters of a safety relay and is an important indicator related to the reliability of the relay application. For the same relay, the contact resistance will vary depending on the magnitude of the current flowing through it in actual field use.

[0003] While existing relay test benches and traditional relay contact resistance testers can perform relay contact resistance tests, they have the following main problems:

[0004] Traditional relay contact resistance testers and test benches can only apply a fixed test current to the relay contacts when testing contact resistance, such as the 0.5A current required by the "Technical Standard for Signal Maintenance Rules of Ordinary Speed ​​Railways"; they cannot simulate the contact resistance value under the field application current of the relay contacts.

[0005] Traditional relay test benches and testers only have the functions of single-time contact resistance testing and data storage; they do not have the functions of continuous full-contact testing, full-contact pulsation testing, continuous single-contact testing, or single-contact pulsation testing, which is not conducive to contact resistance fault analysis.

[0006] Traditional relay test benches are bulky and cannot be carried to the maintenance site to test and analyze the relay contact resistance. Currently, the actual situation on site is to remove relays suspected of having contact resistance faults and bring them back to the maintenance station for contact resistance testing. This method is inefficient and affects the efficiency of on-site maintenance and the reliability of fault analysis.

[0007] In summary, current relay contact resistance testers suffer from several drawbacks, including the inability to adjust the test current and the inability to simulate the actual resistance in field application circuits. They also exhibit low testing efficiency, difficulty in data analysis and fault diagnosis, and inconvenience in portability. Utility Model Content

[0008] The purpose of this invention is to provide a portable intelligent relay contact resistance tester. This tester can adjust the relay contact resistance test current to simulate the real resistance under field application circuits. It has high testing efficiency, simple data analysis, and is easy to carry.

[0009] To achieve the above objectives, this utility model provides a portable intelligent relay contact resistance tester, comprising a main control box and a tablet computer. The main control box includes a main control system and an 8454 socket. The main control system includes a main control board MCU, a voltage conversion module, a multi-channel configurable constant current source module, a high-precision voltage measurement module, a relay contact switching module, and a wireless module. The main control board MCU controls the wireless module, the contact switching module, and the high-precision voltage measurement module. The voltage conversion module provides power to the main control board MCU and the multi-channel configurable constant current source module, which in turn controls the relay contact switching module. Multiple external relay contact groups are connected to the internal terminals of the main control system via the 8454 socket. The tablet computer, equipped with testing software, communicates with the main control system via the wireless module.

[0010] As a further embodiment of this utility model: the relay contact group includes a normally open contact, a normally closed contact, and a neutral contact; when the relay is energized, the neutral contact and the normally open contact are closed, and the resistance between the neutral contact and the normally open contact is measured; when the relay is de-energized, the neutral contact and the normally closed contact are closed, and the resistance between the neutral contact and the normally closed contact is measured.

[0011] As a further embodiment of this utility model: the multi-channel configurable constant current source module includes a "+" terminal and a "-" terminal. The "+" terminal outputs a high-precision DC current, which is input from the middle contact of the relay, flows out through the normally closed contact, and finally flows into the "-" terminal.

[0012] There is a certain resistance between the neutral contact and the normally closed contact, and a voltage will be generated between them. The generated voltage is input to the "IN+" and "IN-" terminals of the high-precision voltage measurement module. The high-precision voltage measurement module measures the voltage across the contacts and obtains the resistance value of the connection through preset parameters. The "IN+" terminal is connected to the voltage measurement + line, and the "IN-" terminal is connected to the voltage measurement - line. The voltage measurement + and voltage measurement - are directly led out from the contact terminals of the relay.

[0013] As a further embodiment of this utility model: the multi-channel configurable constant current source module includes constant current sources I to V connected in parallel, constant current sources I to V connected in series with relays KA1-1 to KA5-1 respectively, constant current source output + line and constant current source output - line connected to relay contact switching module, relay contact switching module includes relays KA6-1 to KA52-1 and KA6-2 to KA52-2 connected in parallel.

[0014] As a further embodiment of this utility model: the main control board MCU controls constant current source I to constant current source V to perform current initialization, and the main control board MCU controls relays KA1-1 to KA5-1 to output according to the set constant current; the output current is sent to the relay contact switching module, and the constant current source is output to any contact of the relay through the switching of relays KA6-1 to KA52-2.

[0015] As a further embodiment of this utility model: the input voltage of the main control system of the tester is AC220V, and the voltage conversion module converts the AC220V voltage into 24V or 5V voltage for use by other modules. The voltage of the multi-channel configurable constant current source module and the relay contact switching module is 24V, while the voltage of the main control board MCU, the wireless module, and the high-precision voltage measurement module is 5V.

[0016] Compared with existing technologies, the multi-channel configurable constant current source module in this invention enables flexible setting of the constant current source size for relay contact resistance testing according to the actual application current of the relay contacts. It allows for testing of contact resistance values ​​under different current conditions; it can realistically simulate on-site usage scenarios, quickly reproduce faults, and greatly improve the efficiency of fault analysis; the high-precision voltage measurement module can measure the true contact resistance value; and the wireless module transmits data collected by the main control board MCU and communicates with the tablet computer, improving testing efficiency and simplifying data analysis. This invention has a simple structure, consisting only of a main control box and a tablet computer, making it easy to carry. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the working principle of this utility model.

[0018] Figure 2 This is a schematic diagram of the relay contact resistance test principle in this utility model.

[0019] Figure 3 This is a schematic diagram of the multi-channel configurable constant current source output in this utility model.

[0020] In the diagram: 1. Main control box, 2. Tester main control system, 3. Tablet PC, 4. 8454 socket, 5. Relay contact group, 6. Multi-channel configurable constant current source module, 7. High-precision voltage measurement module, 8. Voltage measurement +, 9. Voltage measurement -, 10. Constant current source output +, 11. Neutral contact, 12. Normally open contact, 13. Normally closed contact, 14. Constant current source output -. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] like Figure 1As shown, the portable intelligent relay contact resistance tester includes a main control box 1 and a tablet computer 3. The main control box 1 is the core of the tester, and it houses the main control system 2 and an 8454 socket 4. The main control system 2 is the core module of the main control box 1, including a main control board MCU, a voltage conversion module, a multi-channel configurable constant current source module 6, a high-precision voltage measurement module 7, a relay contact switching module, and a wireless module. The main control board MCU controls the wireless module, the contact switching module, and the high-precision voltage measurement module 7, respectively. The voltage conversion module provides power to the main control board MCU and the multi-channel configurable constant current source module 6, which in turn controls the contact switching module. Multiple external relay contact groups 5 are connected to the internal terminals of the main control system 2 via the 8454 socket 4. The tablet computer 3, equipped with testing software, communicates with the main control system via the wireless module.

[0023] The MCU on the main control board is the core unit of the tester's main control system board, responsible for driving other modules and circuits and acquiring signals.

[0024] The input voltage of the main control system 2 of the tester is AC220V. The voltage conversion module converts the AC220V voltage to the 24V or 5V voltage required by other modules and circuits. The multi-channel configurable constant current source module 6 and the relay contact switching module require 24V, while the main control board MCU, wireless module and high-precision voltage measurement module 7 require 5V.

[0025] The multi-channel configurable constant current source module 6 realizes the generation and output setting functions of multiple constant current sources. The internal logic device sets a constant current source of constant size as needed, which is used to simulate the contact resistance test of relay contact current used in the field.

[0026] The high-precision voltage measurement module 7 is used to measure the voltage generated at both ends of the contact under constant current.

[0027] The relay contact switching module is used to perform switching tests on the resistance of normally closed and normally open contacts of multiple relay contacts.

[0028] The wireless module serves as an information transmission channel between the tablet and the main control board MCU. Information interaction between the tablet and the main control board MCU is achieved through the wireless module.

[0029] The 8454 socket is the electrical interface between the tester and the relay under test. The relay is plugged into the 8454 socket, and the tester connects the signal lines to the 8454 socket.

[0030] The tablet computer serves as the carrier of the testing software, enabling communication and control with the main control box of the tester. Users can communicate and control the tester through the interactive interface to achieve the contact resistance testing function.

[0031] The relay has a maximum of eight relay contact groups 5, which include normally open contacts, normally closed contacts, and neutral contacts; Figure 1 For example, relay contact group 5 is connected to the main control system 2 of the tester from top to bottom through normally open contact, normally closed contact, and neutral contact. When the relay is energized, the neutral contact and normally open contact are closed, and the resistance between the neutral contact and normally open contact is measured; when the relay is de-energized, the neutral contact and normally closed contact are closed, and the resistance between the neutral contact and normally closed contact is measured.

[0032] Taking a group of relay contacts as an example, Figure 2 With the relay in the down state, the neutral contact 11 and the normally closed contact 13 are closed. Measure the resistance between the neutral contact 11 and the normally closed contact 13.

[0033] The multi-channel configurable constant current source module 6 includes a "+" terminal and a "-" terminal. The "+" terminal of the multi-channel configurable constant current source module 6 outputs a high-precision DC current, which is input from the relay's neutral contact 11, flows out through the normally closed contact 13, and finally flows into the "-" terminal of the multi-channel configurable constant current source module 6.

[0034] There is a certain resistance between the intermediate contact 11 and the normally closed contact 13, which generates a voltage. This voltage is input to the "IN+" and "IN-" terminals of the high-precision voltage measurement module 7. The high-precision voltage measurement module 7 measures the voltage across the contacts and uses preset parameters to determine the resistance value of the connection. The "IN+" terminal is connected to the voltage measurement +8 line, and the "IN-" terminal is connected to the voltage measurement -9 line. Voltage measurement +8 and voltage measurement -9 are directly led out from the relay contact terminals to ensure that the measured resistance value is the true contact resistance value.

[0035] The multi-channel configurable constant current source module 6 can completely simulate the application scenarios of relay contacts in the field, and can be used to meet the needs of loading current according to the actual current passing through the contacts of different relays in different application scenarios, and testing the contact resistance.

[0036] like Figure 3 As shown, the multi-channel configurable constant current source module 6 includes constant current sources I to V connected in parallel. Constant current sources I to V are connected in series with relays KA1-1 to KA5-1 respectively. The constant current source output +10 line and constant current source output -14 line are connected to the relay contact switching module. The relay contact switching module includes relays KA6-1 to KA52-1 and KA6-2 to KA52-2 connected in parallel.

[0037] The main control board MCU controls constant current source I to constant current source V to initialize the current. The main control board MCU controls the logic switching device relays KA1-1 to KA5-1 to output the constant current according to the set constant current. The output current is sent to the relay contact switching module. Through the switching of relays KA6-1 to KA52-2, the constant current source output is sent to any contact of the relay, thus completing the function of setting multiple constant current source test contact resistances.

[0038] This portable intelligent relay contact resistance tester can meet the needs of testing contact resistance by applying current to the relay contacts under different application circuit scenarios based on the actual current flowing through them. The tester offers five current levels for testing contact resistance. Users can select the appropriate current level based on the actual current in the application circuit, solving the problem of difficult relay fault analysis and even the inability to pinpoint the fault location, greatly improving fault analysis efficiency. In the field of relay testing, the tablet computer's built-in software enables continuous testing of all contacts, pulsating testing of all contacts, continuous testing of single contacts, and pulse testing of single contacts. The tablet computer also provides a graphical display of contact resistance, facilitating relay contact resistance fault analysis, improving work efficiency, and reducing manual labor.

Claims

1. A portable relay contact resistance intelligent tester, characterized in that, The utility model relates to a kind of test instrument, including master control box (1), tablet computer (3), master control box (1) inside includes tester master control system (2), 8454 socket (4), tester master control system (2) includes master control board MCU, voltage conversion module, multipath settable constant current source module (6), high-precision voltage measurement module (7), relay contact switching module, wireless module, master control board MCU controls wireless module, contact switching module, high-precision voltage measurement module (7) respectively, voltage conversion module is the power supply for master control board MCU, multipath settable constant current source module (6), multipath settable constant current source module (6) controls relay contact switching module;External multiple relay contact groups (5) are connected with tester master control system (2) inside wiring terminal by 8454 socket (4);Tablet computer (3) is equipped with test software and communicates with tester master control system (2) by wireless module.

2. The portable relay contact resistance intelligent tester according to claim 1, characterized in that, The relay contact group (5) includes dynamic closing contact (12), dynamic breaking contact (13), middle contact (11);When relay is attracted, middle contact (11) is closed with dynamic closing contact (12), and the resistance between middle contact (11) and dynamic closing contact (12) is measured;When relay falls, middle contact (11) is closed with dynamic breaking contact (13), and the resistance between middle contact (11) and dynamic breaking contact (13) is measured.

3. The portable relay contact resistance intelligent tester according to claim 2, characterized in that, The multipath settable constant current source module (6) includes "+ " terminal, "- " terminal, "+ " terminal output high-precision direct current, input from middle contact (11) of relay, flow out through dynamic breaking contact (13), finally flow into "- " terminal; There is certain resistance between middle contact (11) and dynamic breaking contact (13), and voltage is generated between middle contact (11) and dynamic breaking contact (13), and the generated voltage is input to the "IN+" and "IN-" terminals of high-precision voltage measurement module (7) respectively;"IN+" terminal connects voltage measurement+ (8) circuit, "IN-" terminal connects voltage measurement- (9) circuit, and voltage measurement+ (8) and voltage measurement- (9) are directly led out from the contact terminal of relay.

4. The portable relay contact resistance intelligent tester according to claim 1 or 2, characterized in that, The multipath settable constant current source module (6) includes parallel constant current source I-constant current source V, constant current source I-constant current source V are connected with relay KA1-1-KA5-1 in series respectively, constant current source output+ (10) circuit and constant current source output- (14) circuit are connected with relay contact switching module, and relay contact switching module includes parallel relay KA6-1-KA52-1, KA6-2-KA52-2.

5. The portable relay contact resistance intelligent tester according to claim 4, characterized in that, Master control board MCU controls current initialization of constant current source I-constant current source V, and master control board MCU controls relay KA1-1-KA5-1 to output according to set constant current; Output current to relay contact switching module, and through the switching of relay KA6-1-KA52-2, constant current source is output to any contact of relay.

6. The portable relay contact resistance intelligent tester according to claim 1, characterized in that, The input voltage of the tester master control system (2) is AC220V, and the voltage conversion module converts the AC220V voltage into 24V or 5V voltage for use by other modules, wherein the voltage of the multi-path settable constant current source module (6) and the relay contact switching module is 24V, and the voltage of the master control board MCU, the wireless module and the high-precision voltage measurement module (7) is 5V.

Images