Relay characteristic testing device and relay characteristic testing method

Abstract

The invention discloses a relay characteristic testing device and a relay characteristic testing method. The testing device comprises a power supply module, a current output module, a voltage and resistance acquisition module and a control module, the power module is connected with the control module and used for providing power. The current output module is respectively connected with the power supply module and the control module and is used for outputting direct current to a coil of the relay; the voltage and resistance acquisition module is connected with the control module and is used for acquiring voltage values at two ends of the coil and resistance values at two ends of a normally open contact of the relay; and the control module is used for generating a test result according to the voltage comparison result, the resistance comparison result and the current comparison result. The test device provided by the invention can effectively improve the accuracy of a test result, has the advantages of simple logic and small size, and is convenient to apply in various environments. Moreover, the device can reduce the dependence on human resources in the testing process, and remarkably improves the testing efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of relay testing, and in particular to a relay characteristic testing device and a relay characteristic testing method. Background Art

[0002] Whether the relay can operate correctly directly affects the safety and stability of the power system, so it is necessary to regularly test the relay characteristics.

[0003] The relay characteristic detection method in the prior art mainly relies on the cooperation of multiple people to perform the detection, which has the disadvantages of inaccurate readings, bulky instruments and labor-intensiveness. Summary of the invention

[0004] The invention provides a relay characteristic test device and a relay characteristic test method, so as to increase the accuracy of the test, reduce the volume of the test device and reduce the manpower loss.

[0005] According to one aspect of the present invention, a relay characteristic test device is provided, wherein the relay is a current-starting relay, and the relay characteristic test device comprises: a power supply module, a current output module, a voltage and resistance acquisition module, and a control module;

[0006] The power supply module is connected to the control module and is used to provide power;

[0007] The current output module is connected to the power module and the control module respectively, and is used to output a direct current to the coil of the relay;

[0008] The voltage and resistance acquisition module is connected to the control module and is used to acquire the voltage value at both ends of the coil and the resistance value at both ends of the normally open contact of the relay;

[0009] The control module is used to control the current output module to output direct current, compare the voltage value with a preset voltage value, compare the resistance value with a preset resistance value, compare the output direct current value with a preset direct current value, and generate a test result based on the voltage comparison result, the resistance comparison result and the current comparison result.

[0010] According to another aspect of the present invention, a relay characteristic test method is provided, wherein the relay is a current-starting relay, and the relay characteristic test method comprises:

[0011] Setting a preset DC current value, a preset voltage value, and a preset resistance value;

[0012] Output DC current to the relay coil;

[0013] Collecting the voltage value at both ends of the coil and the resistance value at both ends of the normally open contacts of the relay;

[0014] Comparing the voltage value with the preset voltage value, comparing the resistance value with the preset resistance value, comparing the output DC current value with the preset DC current value, and generating a test result according to the voltage comparison result, the resistance comparison result and the current comparison result;

[0015] The test results are output and stored.

[0016] The embodiment of the present invention outputs current to the coil of the relay through the current output module, so that the relay can be powered on, and then the voltage at both ends of the relay coil and the resistance at both ends of the normally open contact are collected through the voltage and resistance acquisition module respectively, so as to judge whether the coil and the normally open contact of the relay are working in the expected working state. The test device provided by the present invention can effectively improve the accuracy of the test results, has the advantages of simple logic and small size, and is easy to use in a variety of environments. In addition, the device can reduce the dependence on human resources during the test process and significantly improve the test efficiency.

[0017] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic diagram of the structure of a relay characteristic test device provided by an embodiment of the present invention;

[0020] Figure 2 A schematic structural diagram of another relay characteristic test device provided by an embodiment of the present invention;

[0021] Figure 3 A wiring diagram of a connection terminal provided by an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of the structure of a display panel of a relay characteristic test device provided by an embodiment of the present invention;

[0023] Figure 5 A flow chart of a relay characteristic testing method provided by an embodiment of the present invention;

[0024] Figure 6A flow chart of another relay characteristic testing method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] In the embodiment of the present invention, the relay is a current-start relay. Specifically, the current-start relay refers to a relay that relies on current changes to start or maintain action. Its working principle is: when current passes through the coil of the relay, the electromagnetic force generated causes the contacts of the relay to close or open.

[0028] Figure 1 The present invention provides a schematic diagram of a relay characteristic test device. This embodiment is applicable to testing relay characteristics. Figure 1As shown, the device includes: a power module 110, a current output module 120, a voltage and resistance acquisition module 130 and a control module 140; the power module 110 is connected to the control module 140 to provide power; the current output module 120 is connected to the power module 110 and the control module 140 respectively, and is used to output a direct current to the coil of the relay; the voltage and resistance acquisition module 130 is connected to the control module 140, and is used to collect the voltage value at both ends of the coil of the relay and the resistance value at both ends of the normally open contact of the relay; the control module 140 is used to control the current output module 120 to output a direct current, compare the voltage value at both ends of the relay coil with the preset voltage value, compare the resistance value of the normally open contact of the relay with the preset resistance value, compare the output direct current value with the preset direct current value, and generate a test result according to the voltage comparison result, the resistance comparison result and the current comparison result.

[0029] Specifically, the power module 110 refers to a module that provides power to the relay characteristic test device, and may include other power sources such as lithium batteries to ensure the normal operation of the test device.

[0030] The current output module 120 refers to a module for providing a stable DC current output. In the embodiment of the present invention, the DC current output by the current output module 120 enters the coil of the relay to energize the coil of the relay and the relay operates. The coil of the relay refers to a component in the relay used to generate electromagnetic force to control the state of the relay contact. When the DC current output by the current output module 120 passes through the coil, the electromagnetic field generated magnetizes the iron core of the relay, thereby closing or releasing the contact to realize the switch of the circuit.

[0031] The voltage and resistance acquisition module 130 refers to an electrical component used to collect and record the values ​​of voltage and resistance in the circuit. In the embodiment of the present invention, the functions of the voltage and resistance acquisition module 130 are: real-time monitoring and collecting the voltage value at both ends of the relay coil to output to the control module 140 to evaluate the working state and performance of the coil; measuring the resistance value at both ends of the normally open contact of the relay to determine the opening and closing state and health of the normally open contact. The normally open contact of the relay refers to a type of contact in the relay. When the relay is not powered or not in operation, the normally open contact remains in an open state and does not conduct current; when the relay is powered or in operation, the normally open contact closes to conduct the circuit. In the embodiment of the present invention, the resistance value at both ends of the normally open contact of the relay is judged to determine whether the normally open contact is closed. For example, if the resistance value at both ends of the normally open contact is less than the preset resistance value, the normally open contact is closed.

[0032] The control module 140 refers to a component used in the relay characteristic test device to manage and coordinate the entire test process. It can control the current output module 120 to provide the required DC current to the relay coil according to the set test parameters and conditions to ensure the accuracy of the test; at the same time, it can also receive the measurement data collected by the voltage and resistance acquisition module 130, and analyze and process these data to generate the test results of the relay characteristics.

[0033] The voltage value refers to the actual voltage value collected by the voltage and resistance acquisition module 130. The preset voltage value refers to the voltage value preset according to the characteristics or requirements of the relay, which is used to compare with the voltage value collected by the voltage and resistance acquisition module 130. The resistance value refers to the actual resistance value collected by the voltage and resistance acquisition module 130. The preset resistance value refers to the resistance value preset according to the characteristics or requirements of the relay, which is used to compare with the resistance value collected by the voltage and resistance acquisition module 130. The output DC current value refers to the DC current value actually output by the current output module 120. The preset DC current value refers to the current value preset according to the characteristics or requirements of the relay.

[0034] The voltage comparison result refers to the comparison result obtained by comparing the voltage value with the preset voltage value, which is used to indicate whether the voltage across the relay coil is within the allowable range. The resistance comparison result refers to the comparison result obtained by comparing the resistance value with the preset resistance value, which is used to determine whether the normally open contact of the relay is closed smoothly. The current comparison result refers to the comparison result obtained by comparing the output DC current value with the preset DC current value, which is used to indicate whether the current flowing through the coil of the relay is within the allowable range. The test result refers to the overall test conclusion obtained by combining the voltage comparison result, resistance comparison result and current comparison result, which is used to determine whether the characteristics of the relay meet the standards.

[0035] In the embodiment of the present invention, the power module 110 provides electric energy for the test device. Under the action of the control module 140, the current output module 120 outputs a direct current to the coil of the relay so that the coil of the relay can be activated. The voltage and resistance acquisition module 130 respectively acquires the voltage at both ends of the relay coil and the resistance at both ends of the normally open contact of the relay. The control module 140 determines whether the characteristics of the relay meet expectations by analyzing the magnitude of the direct current output by the current output module 120 and the magnitude of the voltage and resistance acquired by the voltage and resistance acquisition module 130, and outputs the test result.

[0036] The embodiment of the present invention outputs current to the coil of the relay through the current output module, so that the relay can be powered on, and then the voltage at both ends of the relay coil and the resistance at both ends of the normally open contact are collected through the voltage and resistance acquisition module respectively, so as to judge whether the coil and the normally open contact of the relay are working in the expected working state. The test device provided by the present invention can effectively improve the accuracy of the test results, has the advantages of simple logic and small size, and is easy to use in a variety of environments. In addition, the device can reduce the dependence on human resources during the test process and significantly improve the test efficiency.

[0037] Figure 2 A schematic diagram of another relay characteristic test device provided by an embodiment of the present invention. Based on the above embodiments, optionally, Figure 2 As shown, the test device also includes: a display module 150, a connection terminal 160, a storage module 170 and a button 180; the display module 150 is used to output the test results; the connection terminal 160 is used to connect to the terminal of the relay; the storage module 170 is used to store the operation record information, alarm record information, detection record information, and self-test record information of the relay characteristic test device; the button 180 is used to turn on and off the relay characteristic test device, and input control parameters.

[0038] Specifically, the display module 150 refers to a portion of the relay characteristic test device for outputting test results and status information in real time, and usually includes one or more liquid crystal display screens to facilitate operators to monitor the test process and results.

[0039] The connection terminal 160 refers to an electrical connection point for connecting with a terminal of a relay to realize transmission and control of electrical signals. The terminal of a relay refers to an electrical connection point on a relay circuit, which is used for electrical connection and signal transmission with an external circuit.

[0040] The storage module 170 refers to a module for storing various record information of the relay characteristic test device. The operation record information refers to the information of the operation steps and settings of the operator. The alarm record information refers to the abnormal conditions and alarm information that appear during the test process, which can help the test equipment to further identify potential problems. The detection record information refers to the detection result information obtained by the test device for each test. The self-test record information refers to the result information obtained after the test device performs a self-test, which can ensure the normal operation of the test device to enhance its safety.

[0041] The button 180 refers to an interface for the user to input control parameters, which is mainly used to turn on and off the relay characteristic test device, and to set and adjust the test parameters. The button 180 usually includes a plurality of function keys to facilitate the operator to operate and set. The control parameters refer to various setting values ​​input by the operator during the relay characteristic detection process. Exemplarily, the control parameters may include: a preset voltage value, a preset resistance value, a preset DC current value, and a current range output by the current output module 120.

[0042] In an embodiment of the present invention, the relay characteristic test device is connected to the relay via the connection terminal 160; the storage module 170 records various types of information measured by the test device for subsequent analysis and processing; the button 180 is used for human-computer interaction of the relay test device, allowing the operator to control and input control parameters; the test results are displayed through the display module 150.

[0043] The embodiment of the present invention enables the relay characteristic test device to maintain reliable electrical connection with the relay under test through the coordinated work of the display module, the connection terminal, the storage module and the button, and stores various records in the test process and displays the test results. The present invention can improve the intelligence level of the test device, and has a good human-computer interaction interface, which increases the convenience of operation of the test device and the user experience.

[0044] Figure 3 A wiring diagram of a connection terminal provided by an embodiment of the present invention. Based on the above embodiments, optionally, Figure 3 As shown, the connecting terminals include a positive current terminal I+, a negative current terminal I-, a positive voltage terminal V+, a negative voltage terminal V-, a positive resistance terminal R+ and a negative resistance terminal R-; the positive current terminal I+ and the negative current terminal I- are respectively connected to the positive measurement terminal QD1 of the coil TBJ and the negative measurement terminal QD2 of the coil TBJ; the positive voltage terminal V+ and the negative voltage terminal V- are respectively connected to the positive measurement terminal QD1 of the coil TBJ and the negative measurement terminal QD2 of the coil TBJ; the positive resistance terminal R+ and the negative resistance terminal R- are respectively connected to the positive measurement terminal QD3 of the normally open contact TBJ1 and the negative measurement terminal QD4 of the normally open contact TBJ1.

[0045] Specifically, the positive current terminal I+ refers to the terminal for outputting positive current in the relay characteristic test device. The negative current terminal I- refers to the terminal for outputting negative current in the relay characteristic test device, which together with the positive current terminal I+ forms a current loop, allowing current to flow from the relay characteristic test device to the relay coil TBJ or other load equipment.

[0046] The positive voltage terminal V+ refers to the terminal used to connect to the positive pole of the device to be tested in the relay characteristic test device. The negative voltage terminal V- refers to the terminal used to connect to the negative pole of the device to be tested in the relay characteristic test device, which cooperates with the positive voltage terminal V+ to ensure that the voltage value at both ends of the relay coil TBJ or other devices can be accurately detected.

[0047] The positive resistance terminal R+ refers to the terminal used to connect to the positive pole of the load or the device to be measured in the relay characteristic test device. The negative resistance terminal R- refers to the terminal used to connect to the negative pole of the load or the device to be measured in the relay characteristic test device, which cooperates with the positive resistance terminal R+ to form a resistance measurement loop to measure the resistance value at both ends of the normally open contact TBJ1.

[0048] In an embodiment of the present invention, the relay characteristic test device outputs a DC current to the relay coil TBJ through the positive current terminal I+ and the negative current terminal I-, the positive voltage terminal V+ and the negative voltage terminal V- test the voltage value across the relay coil TBJ, and the positive resistance terminal R+ and the negative resistance terminal R- measure the resistance value across the normally open contact TBJ1 of the relay, thereby determining whether the relay characteristics meet the standards.

[0049] The embodiment of the present invention outputs a direct current to the relay coil through the current connection terminal, and then respectively tests the voltage at both ends of the relay coil and the resistance value at both ends of the normally open contact through the voltage terminal and the resistance terminal. The present invention has the advantages of simple wiring and convenient operation, can improve the user experience and efficiency, and make the relay testing process more efficient, safe and reliable.

[0050] Figure 4 A schematic diagram of the structure of a display panel of a relay characteristic test device provided by an embodiment of the present invention. Figure 4 As shown, the display panel includes the connection terminal 160, the display module 150 and all or part of the structure of the button 180. Among them, the connection terminal 160 includes a positive current terminal I+, a negative current terminal I-, a positive voltage terminal V+, a negative voltage terminal V-, a positive resistance terminal R+, a negative resistance terminal R-, a ground terminal PE and a power input terminal IN. The display module 150 includes a resistance sampling display window R, a voltage sampling display window U, a resistance sampling display window I, a preset voltage value display window U1, a preset DC current value display window I1 and a test result display window G. The button 180 includes a power indicator D, a power on button ON, a power off button OFF, a parameter setting button 181, a start test button 182, an end test button 183, a preset voltage value setting button U2, a preset DC current value setting button I2, a preset step setting button Step and a preset time setting button Time.

[0051] Figure 5 This is a flow chart of a relay characteristic test method provided by an embodiment of the present invention. This embodiment can be applied to test whether the characteristics of the relay meet the standards. This method can be applied to the relay characteristic test device provided by any embodiment of the present invention. The test device can be configured in the monitoring center of the power system, relay test bench, automated test equipment or mobile test tool. Figure 5 As shown, the method includes:

[0052] S210, setting a preset DC current value, a preset voltage value, and a preset resistance value.

[0053] Specifically, the user can set the preset DC current value, preset voltage value and preset resistance value according to the test requirements, so that the test device can adapt to a variety of application scenarios and increase the flexibility of the test device. For example, the preset voltage value can be 5% of the rated voltage of the coil, and the preset resistance value can be 1 ohm.

[0054] S220, output DC current to the relay coil.

[0055] Specifically, when the relay coil receives a sufficiently large direct current, an electromagnetic field can be generated, thereby activating the relay coil.

[0056] S230, collecting the voltage value across the coil and the resistance value across the normally open contacts of the relay.

[0057] Specifically, the voltage value across the coil can reflect the working state of the relay coil and the current flow. If the voltage value is within the predetermined range, it indicates that the coil is working properly and the electromagnetic field generated is sufficient to activate the relay; if the voltage value is lower than the set value, it may indicate insufficient power supply, coil failure or poor connection. The resistance value across the normally open contacts of the relay can reflect the conduction state of the contacts. A lower resistance value indicates that the contacts are closed normally and can effectively transfer the load current; while a higher resistance value may indicate poor contact or a fault in the contacts.

[0058] S240, comparing the voltage value with the preset voltage value, comparing the resistance value with the preset resistance value, comparing the output DC current value with the preset DC current value, and generating a test result according to the voltage comparison result, the resistance comparison result and the current comparison result.

[0059] Specifically, by comprehensively analyzing the voltage comparison results, resistance comparison results and current comparison results, the relay characteristic test device can determine whether the relay can work normally, and then generate test results, providing a basis for subsequent fault analysis and maintenance decisions, thereby effectively improving the working stability and safety of the relay.

[0060] S250: Output and store the test results.

[0061] Specifically, the test results will be displayed in real time on the display module so that the operator can grasp the test status of the relay in real time. Storing the test results can ensure the long-term availability and traceability of the data, providing a basis for subsequent analysis and decision-making.

[0062] The embodiment of the present invention outputs a direct current to the relay coil to activate it and generate an electromagnetic field, and then collects the voltage at both ends of the coil and the resistance value at both ends of the normally open contact of the relay, and analyzes whether the relay is working normally by comparing the output direct current value, voltage value and resistance value with the preset direct current value, preset voltage value and preset resistance value. The present invention can improve the accuracy and reliability of the relay characteristic test device, provide a strong guarantee for the safe operation of the power system; at the same time, it can also reduce the investment of human resources and save labor costs.

[0063] On the basis of the above embodiments, optionally, outputting a direct current to the relay coil includes: gradually increasing the output direct current acting on the relay coil according to a preset step size.

[0064] Specifically, the preset step size refers to the current value increased each time when the output DC current acting on the relay coil is gradually increased. The selection of the preset step size can be adjusted according to the rated current and characteristics of the relay to ensure that the current increase process is smooth and safe.

[0065] In the embodiment of the present invention, when testing the relay characteristics, the DC current output to the relay coil does not reach the preset value at one time, but gradually increases in a certain step size. By gradually increasing the current according to the preset step size, the current value of each stage can be accurately controlled, making the test more detailed and controllable, which helps to observe the performance changes of the relay under different current conditions, and further improves the accuracy and reliability of the relay characteristic test.

[0066] On the basis of the above embodiments, optionally, the voltage value is compared with a preset voltage value, the resistance value is compared with a preset resistance value, and the output DC current value is compared with a preset DC current value. The test results generated according to the voltage comparison results, the resistance comparison results and the current comparison results include: if the detected voltage value is equal to 0, the test result is: the relay action circuit is abnormal.

[0067] Specifically, when the voltage value at both ends of the coil is 0, it indicates that the relay coil does not receive any voltage. The action circuit of the relay relies on an appropriate voltage to activate the electromagnetic coil. If the voltage is 0, it means that the relay cannot work normally and cannot switch the contacts, that is, the relay action circuit is abnormal. In an embodiment of the present invention, the reason why the coil voltage is 0 may be due to a power failure, a poor connection, or a failure of the coil itself. It can be further determined whether the power supply connected to the relay is working normally, whether the connecting wire is loose or broken, whether the coil is short-circuited or open-circuited, etc.

[0068] On the basis of the above embodiments, optionally, the voltage value is compared with a preset voltage value, the resistance value is compared with a preset resistance value, and the output DC current value is compared with a preset DC current value. The test results generated according to the voltage comparison result, the resistance comparison result and the current comparison result include: outputting DC current to the relay within a preset time, and if the detected resistance value is greater than the preset resistance value, the test result is: the relay cannot operate correctly.

[0069] Specifically, if the resistance value detected by the test device is greater than the preset resistance value, it indicates that the normally open contact of the relay fails to achieve effective connection in the expected on state, that is, the relay cannot operate correctly. Exemplarily, the preset time can be set to 60s, and the preset resistance value can be set to 1 ohm. In the embodiment of the present invention, after reaching the conclusion that "the relay cannot operate correctly", it can be further confirmed whether the normally open contact of the relay is clean and not damaged.

[0070] On the basis of the above embodiments, optionally, the voltage value is compared with the preset voltage value, the resistance value is compared with the preset resistance value, and the output DC current value is compared with the preset DC current value. The test results generated according to the voltage comparison result, the resistance comparison result and the current comparison result include: if the output DC current value is greater than the preset DC current value, the test result is: the action current is unqualified.

[0071] Specifically, the detected output DC current value exceeds the preset DC current value, indicating that the current required by the relay when activated exceeds its design specification, that is, the operating current is unqualified.

[0072] On the basis of the above embodiments, optionally, the voltage value is compared with a preset voltage value, the resistance value is compared with a preset resistance value, and the output DC current value is compared with a preset DC current value. The test results generated according to the voltage comparison result, the resistance comparison result and the current comparison result include: if the voltage value is greater than the preset voltage value, the test result is: the coil voltage drop is unqualified.

[0073] Specifically, if the detected voltage value is greater than the preset voltage value, it means that the voltage drop of the relay coil during operation exceeds the design standard, that is, the coil voltage drop is unqualified. Unqualified coil voltage drop may cause the relay to be unable to obtain sufficient electromagnetic force to activate the contacts, thereby affecting its switching function, and may cause the relay to fail to operate normally or react slowly.

[0074] On the basis of the above embodiments, optionally, the voltage value is compared with a preset voltage value, the resistance value is compared with a preset resistance value, and the output DC current value is compared with a preset DC current value. The test results generated according to the voltage comparison result, the resistance comparison result and the current comparison result include: if the output DC current value is less than or equal to the preset DC current value and the voltage value is less than or equal to the preset voltage value, the test result is: the relay action characteristics are qualified.

[0075] Specifically, the detected output DC current value and voltage value are both within the preset range, indicating that the relay meets the design and performance requirements during the activation process and can operate normally under specified conditions, that is, the relay action characteristics are qualified.

[0076] Figure 6 Flow chart of another relay characteristic test method provided by an embodiment of the present invention. Figure 6 As shown, the steps of the method are:

[0077] Start the test, then disconnect the control power air switch connected to the relay to be tested, and use the voltage range of the multimeter to measure and confirm that there is no voltage to ensure the safety and accuracy of the test. Set the preset DC current value, preset voltage value and preset resistance value; the positive current terminal and negative current terminal of the test device are respectively connected to the two ends of the relay coil to output DC current; the positive voltage terminal and negative voltage terminal are respectively connected to the two ends of the current relay coil to measure the DC voltage; the positive resistance terminal and negative resistance terminal are respectively connected to the normally open contact of the current relay to measure its resistance. Then, according to the preset step size, gradually increase the output DC current acting on the relay coil. First, determine whether there is voltage at both ends of the coil. If not, that is, the voltage at both ends of the coil is equal to 0, and the output is: the relay action circuit is abnormal. If so, further determine that within 60s of the output current, the resistance at both ends of the normally open contact is less than or equal to 1Ω. If not, output: the relay cannot operate correctly. If so, pause the output and record the output DC current value and voltage value at this time, and then determine whether the recorded output DC current value is less than or equal to the preset DC current value. If not, output: the action current is unqualified. If so, determine whether the voltage value is less than or equal to the preset voltage value. If not, output: the coil voltage drop is unqualified. If so, output: the relay action characteristics are qualified.

[0078] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0079] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A relay characteristic test device, characterized in that: The relay is a current-start relay, and the relay characteristic test device includes: a power supply module, a current output module, a voltage and resistance acquisition module and a control module; The power supply module is connected to the control module and is used to provide power; The current output module is connected to the power module and the control module respectively, and is used to output a direct current to the coil of the relay; The voltage and resistance acquisition module is connected to the control module and is used to acquire the voltage value at both ends of the coil and the resistance value at both ends of the normally open contact of the relay; The control module is used to control the current output module to output direct current, compare the voltage value with a preset voltage value, compare the resistance value with a preset resistance value, compare the output direct current value with a preset direct current value, and generate a test result based on the voltage comparison result, the resistance comparison result and the current comparison result.

2. The relay characteristic test device according to claim 1, characterized in that: The test device also includes: a display module, a connection terminal, a storage module and a button; The display module is used to output the test result; The connecting terminal is used to connect to the terminal of the relay; The storage module is used to store the operation record information, alarm record information, detection record information, and self-test record information of the relay characteristic test device; The button is used to turn on and off the relay characteristic test device and input control parameters.

3. The relay characteristic test device according to claim 2, characterized in that: The connection terminals include a positive current terminal, a negative current terminal, a positive voltage terminal, a negative voltage terminal, a positive resistance terminal and a negative resistance terminal; The positive current terminal and the negative current terminal are connected to the positive measuring end of the coil and the negative measuring end of the coil respectively; The positive voltage terminal and the negative voltage terminal are connected to the positive measuring end of the coil and the negative measuring end of the coil respectively; The positive resistance terminal and the negative resistance terminal are connected to the positive measurement end of the normally open contact and the negative measurement end of the normally open contact, respectively.

4. A relay characteristic test method, characterized in that: The relay is a current-start type relay, and the relay characteristic test method includes: Setting a preset DC current value, a preset voltage value, and a preset resistance value; Output DC current to the relay coil; Collecting the voltage value at both ends of the coil and the resistance value at both ends of the normally open contacts of the relay; Comparing the voltage value with the preset voltage value, comparing the resistance value with the preset resistance value, comparing the output DC current value with the preset DC current value, and generating a test result according to the voltage comparison result, the resistance comparison result and the current comparison result; The test results are output and stored.

5. The relay characteristic test method according to claim 4, characterized in that: Outputting a direct current to the relay coil comprises: The output DC current acting on the relay coil is gradually increased according to the preset step size.

6. The relay characteristic test method according to claim 4, characterized in that: The comparing of the voltage value with the preset voltage value, the comparing of the resistance value with the preset resistance value, and the comparing of the output DC current value with the preset DC current value, and generating the test result according to the voltage comparison result, the resistance comparison result, and the current comparison result comprises: If the detected voltage value is equal to 0, the test result is: the relay action circuit is abnormal.

7. The relay characteristic test method according to claim 4, characterized in that: The comparing of the voltage value with the preset voltage value, the comparing of the resistance value with the preset resistance value, and the comparing of the output DC current value with the preset DC current value, and generating the test result according to the voltage comparison result, the resistance comparison result, and the current comparison result comprises: A direct current is output to the relay within a preset time. If the detected resistance value is greater than the preset resistance value, the test result is that the relay cannot operate correctly.

8. The relay characteristic test method according to claim 4, characterized in that: The comparing of the voltage value with the preset voltage value, the comparing of the resistance value with the preset resistance value, and the comparing of the output DC current value with the preset DC current value, and generating the test result according to the voltage comparison result, the resistance comparison result, and the current comparison result comprises: If the output DC current value is greater than the preset DC current value, the test result is: the operating current is unqualified.

9. The relay characteristic test method according to claim 4, characterized in that: The comparing of the voltage value with the preset voltage value, the comparing of the resistance value with the preset resistance value, and the comparing of the output DC current value with the preset DC current value, and generating the test result according to the voltage comparison result, the resistance comparison result, and the current comparison result comprises: If the voltage value is greater than the preset voltage value, the test result is: the coil voltage drop is unqualified.

10. The relay characteristic test method according to claim 4, characterized in that: The comparing of the voltage value with the preset voltage value, the comparing of the resistance value with the preset resistance value, and the comparing of the output DC current value with the preset DC current value, and generating the test result according to the voltage comparison result, the resistance comparison result, and the current comparison result comprises: If the output DC current value is less than or equal to the preset DC current value and the voltage value is less than or equal to the preset voltage value, the test result is: the relay action characteristic is qualified.

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