Automatic detection platform and method suitable for contact performance of electromagnetic relay contact

Abstract

The invention belongs to the technical field of automatic testing, and particularly relates to an automatic detection platform and method suitable for the contact performance of electromagnetic relay contacts. Comprising a control host and a relay switching box. The control host is used as a core control unit of the whole automatic detection platform, and the control host is responsible for sending an instruction and processing data; the relay switching box serves as an execution unit and comprises a communication module and a relay module, the switching box communication module receives instructions of the control host, and switching and on-off of a circuit are achieved by controlling actions of the internal relay module. The relay automatic verification platform has the advantages that the relay automatic verification platform is adopted for verification, plug and play is achieved, and verification of one relay can be completed within one minute. Different relays can be measured repeatedly through one-time wiring only by checking the type of the relay and connecting the voltage of the coil.

Description

Technical Field

[0001] The invention belongs to the technical field of automated testing, and in particular relates to an automatic detection platform and method suitable for the contact performance of electromagnetic relay contacts. Background Art

[0002] The synchronous grid-connected system of nuclear power plants uses a large number of electromagnetic relays. Due to the limitations of the process and material level of electromagnetic relays, over time, oxidation of the contact surface and degradation of reed performance will lead to contact blockage, poor contact, and contact adhesion. These failures will seriously affect the reliability of the unit's grid-connected operation.

[0003] In order to improve the reliability of electromagnetic relays, the practical approach is to strengthen strict screening and testing, select parameters that have a greater impact on the use of relays for testing, and evaluate whether the electrical performance of the relay meets the requirements for continued use. The test indicators include the relay's action value, return value, action time and contact reliability. At present, the relay protection instruments on the market have been designed to detect the relay's action value and return value, but there is no contact conduction test. The conventional contact calibration method is to power on and off the relay coil, and use a multimeter to measure the contact on-off status and resistance value one by one. With this calibration method, the relay contains multiple contacts, the wiring is frequent, and the calibration time is too long, which affects the maintenance progress. Summary of the invention

[0004] The purpose of the present invention is to provide an automatic detection platform and method suitable for the contact performance of electromagnetic relay contacts, which can make up for the shortcomings of existing relay detection. During on-site work, only simple operation of the verification platform is required to realize automatic verification of the relay, simplify wiring, liberate manpower, shorten working hours, provide convenience for maintenance personnel, promote automation and intelligence of maintenance work, and improve economic benefits.

[0005] The technical solution of the present invention is as follows: an automatic detection platform for the contact performance of electromagnetic relay contacts, comprising a control host and a relay switching box;

[0006] The control host serves as the core control unit of the entire automatic detection platform, and is responsible for issuing instructions and performing data processing;

[0007] The relay switching box serves as an execution unit, including a communication module and a relay module. The communication module of the switching box receives instructions from the control host and realizes the switching and on-off of the circuit by controlling the action of the internal relay module.

[0008] The control host accurately controls and measures the relay switching box according to the preset program and real-time input signals. The control host integrates the functions of voltage module, input module, output module, communication module and resistance test module, and is responsible for managing the operation and control of the entire detection platform, providing AC or DC voltage for controlling the output excitation relay action, performing input detection, remote control switching of the relay switching box, and contact resistance measurement and recording.

[0009] The relay module in the relay switching box has multiple contacts and can control the on and off states of multiple circuits at the same time.

[0010] The control host and the relay switching box form a close control and controlled relationship in the automatic detection platform, and realize the automatic detection function through information interaction and collaborative work.

[0011] The control instructions of the control host to the relay switching box are issued by the communication module of the control host. The command for remotely switching the relay switching box needs to contain 3 elements: relay number, relay contact number and function selection. The function selection refers to whether to test the relay action value / return value or contact resistance.

[0012] The relay switching box panel is equipped with bases of various types of relays. When the relay is inserted into the base interface of the corresponding type, the relay under test is connected to the loop in the test system.

[0013] The switch box receives the communication remote control command of the host and realizes the circuit switching function in the following three situations:

[0014] (1) Realize the switching between contact resistance measurement and the measurement of action voltage and action time by the relay itself;

[0015] (2) Realize switching between different types of relays;

[0016] (3) Realize switching between different contacts of the same relay.

[0017] An automatic detection method for contact performance of electromagnetic relay contacts includes the following steps:

[0018] Step 1: Experimental Preparation

[0019] Connect the relay protection instrument and the relay switching box. You only need to connect the DC, AC voltage, input quantity and network communication in the first relay test. There is no need to modify the wiring for subsequent relay tests. Just insert the relay into the corresponding base.

[0020] Step 2: Start Testing

[0021] Start the relay protection instrument to work, select the test template corresponding to the current relay model, and start automatic detection according to the pre-established automatic test process. The detection items include: relay action value, return value and contact resistance. The relay action and return value test is obtained by increasing or decreasing the output voltage according to a certain step length until the contact is detected to be on or off to record the current voltage output. The contact resistance includes 3 measurements. It is necessary to test the resistance value of each contact of the relay after the action and the resistance value after the release to determine whether the contact has the ability to open and close normally;

[0022] Step 3: Result processing

[0023] The measured action value, return value, resistance value and other data of the relay are compared with the parameter indicators of the corresponding relay, and the test results are automatically judged as qualified or unqualified, and the test results are recorded and a test report is generated, which includes the test items, test data and test results.

[0024] The beneficial effect of the present invention is that if all the contacts and resistance values ​​of an 8-pair contact relay need to be verified, the full manual verification takes about 15 minutes. In addition, due to the small size of the relay and the dense wiring, it is easy to accidentally touch and cause a short circuit, which damages the relay. Each relay needs to check the contact terminal and repeat the wiring, which is time-consuming and labor-intensive. The relay automatic verification platform is used for inspection, which is plug-and-play and can complete the verification of a relay in 1 minute. It only needs to check the relay model and connect the coil voltage. Different relays can be repeatedly measured multiple times after one wiring. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the relay test platform;

[0026] Figure 2 It is a schematic diagram of relay switching;

[0027] Figure 3 This is the relay detection flow chart. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1 As shown, an automatic detection platform for the contact performance of electromagnetic relay contacts includes a control host and a relay switching box.

[0030] Control host: As the core control unit of the entire automatic detection platform, the control host is responsible for issuing instructions and processing data. It has powerful computing power and complex logical judgment capabilities, and can accurately control and measure the relay switching box according to the preset program and real-time input signals. The control host adopts the hardware foundation of the relay protection instrument, and integrates the functions of voltage module, input module, output module, communication module and resistance test module. It is responsible for managing the operation and control of the entire detection platform, providing AC or DC voltage to control the output excitation relay action, performing input detection, remote control switching of the relay switching box, and contact resistance measurement and recording.

[0031] Relay switch box: As an execution unit, it includes a communication module and a relay module. The communication module of the switch box receives instructions from the control host and realizes the switching, on-off and other functions of the circuit by controlling the action of the internal relay module. The relay in the box usually has multiple contacts and can control the on-off status of multiple circuits at the same time, thereby meeting the complex requirements of the automatic detection platform for circuit switching.

[0032] The control host and the relay switching box form a close control and controlled relationship in the automatic detection platform, and realize the automatic detection function through information interaction and collaborative work.

[0033] The control command of the control host to the relay switching box is issued by the communication module of the control host. In order to ensure that the control command corresponds to the object to be tested, the command of remote control switching relay switching box needs to contain 3 elements: relay number, relay contact number and function selection. Function selection refers to whether to test the relay action value / return value or contact resistance. The resistance test module measures resistance by constant current voltage measurement. A small current is added to the contact to be tested, and then the voltage across the contact is measured. The measured voltage value is divided by the current flowing through the contact to obtain the resistance value of the measured resistor.

[0034] The relay switching box panel is equipped with bases for various types of relays. Users do not need to perform complicated installation and wiring steps. They only need to insert the relay into the base interface of the corresponding model, and the relay under test will be connected to the circuit in the test system. The switching box receives the communication remote control command of the host and realizes the circuit switching function in the following three situations:

[0035] (1) Realize the switching between contact resistance measurement and the measurement of action voltage and action time by the relay itself;

[0036] (4) Realize switching between different types of relays;

[0037] (5) Realize switching between different contacts of the same relay.

[0038] Example:

[0039] Take the relay switching circuit of the relay contact switching room in the RXMA1 RK 211074 as an example to explain in detail:

[0040] like Figure 2 As shown, REL5 realizes the switching of normally open and normally closed contacts, REL1 realizes the switching of normally closed points 1 and 2, REL2 realizes the switching of normally open points 1 and 2 and 3 and 4, REL3 realizes the switching of normally open points 13 and 24, and REL4 realizes the switching of the 5th normally open point.

[0041] The entire logic action of the relay is shown in Table 1:

[0042] Table 1 Example of relay node table

[0043]

[0044]

[0045] The output terminal circuit that is finally connected can be used as the corresponding contact measurement circuit.

[0046] An automatic detection method for contact performance of electromagnetic relay contacts includes the following steps:

[0047] Step 1: Experimental Preparation

[0048] According to the attached Figure 1 Correctly connect the relay protection instrument and the relay switching box. You only need to make DC, AC voltage, input quantity and network communication connections in the first relay test. There is no need to modify the wiring for subsequent relay tests. Just insert the relay into the corresponding base.

[0049] Step 2: Start Testing

[0050] Start the relay protection instrument to start working, select the test template corresponding to the current relay model, and follow the pre-defined automatic test process, such as Figure 3 As shown, automatic detection starts. The detection items include: relay action value, return value and contact resistance. The relay action and return value tests are obtained by increasing or decreasing the output voltage in a certain step until the contact is detected to be turned on or off to record the current voltage output. The contact resistance includes 3 measurements. It is necessary to test the resistance value of each contact of the relay after it is actuated and the resistance value after it is released to determine whether the contacts have the ability to open and close normally.

[0051] Step 3: Result processing

[0052] The measured action value, return value, resistance value and other data of the relay are compared with the parameter indicators of the corresponding relay to automatically determine whether the test result is qualified or unqualified. The test results are recorded and a test report is generated. The report includes the test items, test data, test results, etc. These records and reports can be used for quality control and troubleshooting of relays.

Claims

1. Applicable to the automatic detection platform of the contact performance of electromagnetic relay contacts, characterized by: Including control host and relay switching box; The control host serves as the core control unit of the entire automatic detection platform, and is responsible for issuing instructions and performing data processing; The relay switching box serves as an execution unit, including a communication module and a relay module. The communication module of the switching box receives instructions from the control host and realizes the switching and on-off of the circuit by controlling the action of the internal relay module.

2. The automatic detection platform for contact performance of electromagnetic relay contacts as claimed in claim 1, characterized in that: The control host accurately controls and measures the relay switching box according to the preset program and real-time input signals. The control host integrates the functions of voltage module, input module, output module, communication module and resistance test module, and is responsible for managing the operation and control of the entire detection platform, providing AC or DC voltage for controlling the output excitation relay action, performing input detection, remote control switching of the relay switching box, and contact resistance measurement and recording.

3. The automatic detection platform for contact performance of electromagnetic relay contacts as claimed in claim 1, characterized in that: The relay module in the relay switching box has multiple contacts and can control the on and off states of multiple circuits at the same time.

4. The automatic detection platform for contact performance of electromagnetic relay contacts as claimed in claim 1, characterized in that: The control host and the relay switching box form a close control and controlled relationship in the automatic detection platform, and realize the automatic detection function through information interaction and collaborative work.

5. The automatic detection platform for contact performance of electromagnetic relay contacts as claimed in claim 1, characterized in that: The control instructions of the control host to the relay switching box are issued by the communication module of the control host. The command for remotely switching the relay switching box needs to contain 3 elements: relay number, relay contact number and function selection. The function selection refers to whether to test the relay action value / return value or contact resistance.

6. The automatic detection platform for contact performance of electromagnetic relay contacts as claimed in claim 1, characterized in that: The relay switching box panel is equipped with bases of various types of relays. When the relay is inserted into the base interface of the corresponding type, the relay under test is connected to the loop in the test system.

7. The automatic detection platform for contact performance of electromagnetic relay contacts as claimed in claim 1, characterized in that: The switch box receives the communication remote control command of the host and realizes the circuit switching function in the following three situations: (1) Realize the switching between contact resistance measurement and the relay itself’s measurement of action voltage and action time; (2) Realize switching between different types of relays; (3) Realize switching between different contacts of the same relay.

8. An automatic detection method for the contact performance of electromagnetic relay contacts, characterized in that: The steps include: Step 1: Experimental Preparation Connect the relay protection instrument and the relay switching box. You only need to connect the DC, AC voltage, input quantity and network communication in the first relay test. There is no need to modify the wiring for subsequent relay tests. Just insert the relay into the corresponding base. Step 2: Start Testing Start the relay protection instrument to work, select the test template corresponding to the current relay model, and start automatic detection according to the pre-established automatic test process. The detection items include: relay action value, return value and contact resistance. The relay action and return value test is obtained by increasing or decreasing the output voltage according to a certain step length until the contact is detected to be on or off to record the current voltage output. The contact resistance includes 3 measurements. It is necessary to test the resistance value of each contact of the relay after the action and the resistance value after the release to determine whether the contact has the ability to open and close normally; Step 3: Result processing The measured action value, return value, resistance value and other data of the relay are compared with the parameter indicators of the corresponding relay, and the test results are automatically judged as qualified or unqualified, and the test results are recorded and a test report is generated, which includes the test items, test data and test results.

Images