Multi-channel direct current contactor control detection system

Abstract

The invention is suitable for the technical field of contactor detection, and provides a multi-channel direct current contactor control detection system, which comprises a plurality of programmable controllers, a data switch and an industrial personal computer, each programmable controller is connected with any direct current contactor and is used for acquiring opening and closing time data of the connected direct current contactor; the data switch is connected with each programmable controller and is used for transmitting each opening and closing time data; and the industrial personal computer is connected with the data switch and is used for carrying out data statistical analysis on the opening and closing time data and determining a performance detection result of each direct-current contactor so as to realize performance comparison of each direct-current contactor. According to the technical scheme provided by the invention, accurate detection and full-period statistics of the multi-channel opening and closing time interval of the direct-current contactor are realized, and real-time detection under the same aging test condition can be carried out on multiple direct-current contactors of different models at the same time; the method is used for comparing parameters such as service life and stability of direct current contactors produced by different processes.

Description

Technical Field

[0001] This application belongs to the field of contactor testing technology, and in particular relates to a multi-channel DC contactor control and testing system. Background Technology

[0002] A DC contactor is a type of contactor used in DC circuits, primarily for controlling DC circuits (main circuits, control circuits, and excitation circuits, etc.). Unlike AC contactors, the core of a DC contactor does not contain eddy currents; therefore, it is typically made of mild steel or industrial pure iron in a circular shape. Because the attraction coil of a DC contactor is energized with direct current, there is no inrush starting current, and the core does not experience violent impacts. Consequently, it has a long lifespan and is suitable for applications requiring frequent start-stop cycles.

[0003] Most DC contactor testing systems on the market are based on low voltage and low current, and most are for ambient temperature testing and single-contact testing. They are judged only by the number of tests on a single unit or single contact, and lack multi-channel and multi-stress evaluation methods based on actual application or laboratory test data. They are not suitable for the parameter and life reliability testing of mainstream multi-channel DC contactors.

[0004] Therefore, how to achieve multi-channel DC contactor detection has become an urgent problem to be solved. Summary of the Invention

[0005] This application provides a multi-channel DC contactor control and detection system, which aims to achieve multi-channel DC contactor detection.

[0006] This application provides a multi-channel DC contactor control and detection system, including several programmable controllers, a data exchange, and an industrial control computer; Each of the programmable controllers is connected to any DC contactor and is used to collect the opening and closing time data of the connected DC contactor; The data switch is connected to each of the programmable controllers and is used to transmit the opening and closing time data of each of the circuit breakers. The industrial control computer is connected to the data exchange and is used to perform data statistics and data analysis on the opening and closing time data of each of the DC contactors, determine and output the performance test results of each of the DC contactors, so as to realize the performance comparison of each of the DC contactors.

[0007] In one possible implementation, each of the programmable controllers is specifically used for: Send a closing command to the connected DC contactor, and receive the energizing signal of the contactor coil and the closing signal of the contactor contacts, and calculate the closing time interval; Send a tripping command to the connected DC contactor, and receive the de-energization signal of the contactor coil and the tripping signal of the contactor contacts, and calculate the tripping time interval; The closing time interval and the opening time interval are sent to the data switch.

[0008] In one possible implementation, the system further includes one or more auxiliary contactors, each of which is connected between any pair of programmable controllers and DC contactors, for contact expansion and control of multiple contacts in the connected DC contactors.

[0009] In one possible implementation, each of the programmable controllers is further configured to: Send a closing command to the connected auxiliary contactor, receive the energized signal of the contactor coil and the closing signal of each contact in the connected DC contactor, and calculate the closing time interval corresponding to each contact. Send a tripping command to the connected auxiliary contactor, receive the de-energization signal of the contactor coil in the connected DC contactor and the tripping signal of each contact, and calculate the tripping time interval corresponding to each contact. The closing time interval and opening time interval corresponding to each contact are sent to the data exchange.

[0010] In one possible implementation, each of the auxiliary contactors is specifically used for: The circuit receives a closing command from a connected programmable controller, and closes the circuit in response to the closing command to energize the contactor coil in the connected DC contactor and control the contacts in the connected DC contactor to be closed. The circuit breaker receives a tripping command from a connected programmable controller, trips the circuit breaker in response to the tripping command, de-energizes the contactor coil in the connected DC contactor, and controls the contacts in the connected DC contactor to open.

[0011] In one possible implementation, the industrial control computer is specifically used for: Data statistics and analysis are performed on the closing time interval and opening time interval corresponding to each contact in each DC contactor to determine and output the performance test results corresponding to each contact, so as to realize the performance comparison between different contacts in each DC contactor.

[0012] In one possible implementation, the system further includes an aging environment testing device for placing each of the DC contactors, providing aging test conditions for each of the DC contactors, simulating long-term operating conditions, so that each of the programmable controllers can collect opening and closing time data of the connected DC contactors under different operating conditions.

[0013] In one possible implementation, each of the programmable controllers is further configured to: Under different operating conditions provided by the aging environment test equipment, a closing command is sent to the connected auxiliary contactor, the energizing signal of the contactor coil and the closing signal of each contact in the connected DC contactor are received, and the closing time interval of each contact under different operating conditions is calculated. Send a tripping command to the connected auxiliary contactor, receive the de-energization signal of the contactor coil in the connected DC contactor and the tripping signal of each contact, and calculate the tripping time interval of each contact under different operating conditions. The closing and opening time intervals of each contact under different operating conditions are sent to the data exchange.

[0014] In one possible implementation, each of the programmable controllers is further configured to: Under the same operating conditions provided by the aging environment test equipment, a closing command is sent to the connected auxiliary contactor, the energizing signal of the contactor coil and the closing signal of the contactor contact are received from the connected DC contactor, and the closing time interval of the contactor contact under the operating conditions is calculated. Send a tripping command to the connected auxiliary contactor, receive the de-energization signal of the contactor coil in the connected DC contactor and the tripping signal of the contactor contact, and calculate the tripping time interval of the contactor contact under the operating conditions. The closing and opening time intervals of the contactor contacts under the specified operating conditions are sent to the data exchange.

[0015] In one possible implementation, the industrial computer is further used for: Data statistics and analysis are performed on the closing time interval and opening time interval of each contact in any DC contactor under different operating conditions. The performance test results corresponding to each contact are determined and output to achieve the performance comparison of each contact in the DC contactor throughout its entire life cycle. Alternatively, data statistics and analysis can be performed on the closing and opening time intervals of each DC contactor under the same operating conditions to determine and output the performance test results of each DC contactor under the same operating conditions, so as to achieve performance comparison of different DC contactors under the same operating conditions.

[0016] The beneficial effects of this application embodiment compared with the prior art are as follows: it includes several programmable controllers, a data exchange, and an industrial control computer; each programmable controller is connected to any DC contactor to collect the opening and closing time data of the connected DC contactor; the data exchange is connected to each programmable controller to transmit the opening and closing time data; the industrial control computer is connected to the data exchange to perform data statistics and data analysis on the opening and closing time data, determine and output the performance test results of each DC contactor, realize the accurate detection of the opening and closing time interval of multiple channels of DC contactors, and can simultaneously perform real-time detection on multiple DC contactors of different models to compare the service life, stability and other parameters of DC contactors produced by different processes. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a multi-channel DC contactor control and detection system provided in an embodiment of this application; Figure 2 A schematic diagram of another multi-channel DC contactor control and detection system provided in an embodiment of this application; Figure 3 A schematic diagram of the structure of another multi-channel DC contactor control and detection system provided in an embodiment of this application; Figure 4 This is a schematic diagram of the closing and opening control logic in a multi-channel DC contactor control and detection system provided in an embodiment of this application. Detailed Implementation

[0019] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0020] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0021] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0022] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0023] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0025] Currently, DC contactors continue to fail in various environments, and some imported models need to be localized to reduce costs. In recent years, the number of DC contactor models and manufacturers that have been replaced or put into operation has been increasing year by year.

[0026] Based on market demand, a control system based on multiple sets of DC contactors needs to be developed to verify the reliability of multi-channel DC contactors. By detecting the multi-channel parameters of the DC contactors, the system can understand their lifespan, high and low temperature performance, and other characteristics. Furthermore, by using practical application data, the system can be used to assess the product's lifespan reliability, providing relevant data for component reliability verification for various enterprises. Therefore, developing a control and testing system based on multiple sets of multi-channel DC contactors meets market demands and industrial environment requirements, and has high practical significance and innovation. This testing system is mainly used to detect and analyze the reliability performance of multiple sets of DC contactors, verify the contactor's lifespan reliability, and provide data support for relevant enterprises in selecting DC contactor performance.

[0027] This application provides a multi-channel DC contactor control and testing system, which is mainly used to verify the reliability of various models of DC contactors. By implementing product aging environment tests, various key performance parameters are monitored. Based on the test data, data analysis and evaluation are performed to understand the performance changes and lifespan of the contactors, providing relevant basis for component verification for related product companies.

[0028] For ease of understanding, the technical solution of this application will be described in detail below with reference to the accompanying drawings.

[0029] Figure 1 This is a schematic diagram of a multi-channel DC contactor control and detection system according to an embodiment of this application. For ease of explanation, only the parts relevant to this embodiment are shown. The system provided in this embodiment includes several programmable controllers, a data exchange, and an industrial control computer. Each programmable controller is connected to any DC contactor to collect the opening and closing time data of the connected DC contactor. The data switch is connected to each programmable controller and is used to transmit the opening and closing time data of each circuit breaker. The industrial control computer, connected to the data exchange, is used to perform data statistics and analysis on the opening and closing times of each circuit breaker, determine and output the performance test results of each DC contactor, so as to realize the performance comparison of each DC contactor.

[0030] As an example, programmable controllers are specifically used for: Send a closing command to the connected DC contactor, and receive the energizing signal of the contactor coil and the closing signal of the contactor contacts, and calculate the closing time interval; Send a tripping command to the connected DC contactor, and receive the de-energization signal of the contactor coil and the tripping signal of the contactor contacts, and calculate the tripping time interval; The closing time interval and opening time interval are sent to the data exchange.

[0031] In one possible implementation, such as Figure 2 As shown, the system also includes one or more auxiliary contactors, each connected between any pair of programmable controllers and DC contactors, for contact expansion and control of multiple contacts in the connected DC contactors. The auxiliary contactors are preferably intermediate relays.

[0032] As an example, programmable controllers are also used for: Send a closing command to the connected auxiliary contactor, receive the energizing signal of the contactor coil and the closing signal of each contact in the connected DC contactor, and calculate the closing time interval corresponding to each contact. Send a tripping command to the connected auxiliary contactor, receive the de-energization signal of the contactor coil and the tripping signal of each contact in the connected DC contactor, and calculate the tripping time interval corresponding to each contact. Send the closing time interval and opening time interval corresponding to each contact to the data exchange.

[0033] As an example, each auxiliary contactor is specifically used for: It receives the closing command from the connected programmable controller, and closes the circuit in response to the closing command so as to energize the contactor coil in the connected DC contactor and control the contacts in the connected DC contactor to be closed. It receives a tripping command from the connected programmable controller, and trips the circuit in response to the tripping command to de-energize the contactor coil in the connected DC contactor and control the contacts in the connected DC contactor to open.

[0034] As an example, industrial PCs are specifically used for: Data statistics and analysis are performed on the closing time interval and opening time interval corresponding to each contact in each DC contactor to determine and output the performance test results corresponding to each contact, so as to realize the performance comparison between different contacts in each DC contactor.

[0035] In one possible implementation, such as Figure 3 As shown, the system also includes an aging environment testing device, which is used to place each DC contactor and provide aging test conditions for each DC contactor to simulate long-term operating conditions, so that each programmable controller can collect the opening and closing time data of the connected DC contactors under different operating conditions.

[0036] As an example, programmable controllers are also used for: Under different operating conditions provided by the aging environment test equipment, a closing command is sent to the connected auxiliary contactor, the energizing signal of the contactor coil and the closing signal of each contact in the connected DC contactor are received, and the closing time interval of each contact under different operating conditions is calculated. Send a tripping command to the connected auxiliary contactor, receive the de-energization signal of the contactor coil and the tripping signal of each contact in the connected DC contactor, and calculate the tripping time interval of each contact under different operating conditions. The closing and opening time intervals of each contact under different operating conditions are sent to the data exchange.

[0037] As another example, programmable controllers are also used for: Under the same operating conditions provided by the aging environment test equipment, a closing command is sent to the connected auxiliary contactor, the energizing signal of the contactor coil and the closing signal of the contactor contact are received in the connected DC contactor, and the closing time interval of the contactor contact under the operating conditions is calculated. Send a tripping command to the connected auxiliary contactor, receive the de-energization signal of the contactor coil and the tripping signal of the contactor contact in the connected DC contactor, and calculate the tripping time interval of the contactor contact under the operating condition. The closing and opening time intervals of the contactor contacts under this operating condition are sent to the data exchange.

[0038] As an example, industrial PCs are also used for: Data statistics and analysis are performed on the closing and opening time intervals of each contact in any DC contactor under different operating conditions. The performance test results of each contact are determined and output to achieve a full life cycle performance comparison of each contact in the DC contactor. Alternatively, data statistics and analysis can be performed on the closing and opening time intervals of each DC contactor under the same operating conditions to determine and output the performance test results of each DC contactor under the same operating conditions, so as to achieve performance comparison of different DC contactors under the same operating conditions.

[0039] In summary, the multi-channel DC contactor control and testing system provided in this application includes a programmable controller, an auxiliary contactor (preferably an intermediate relay), a data exchange, an aging environment testing device, and an industrial control computer. This testing system can accurately detect and statistically analyze the opening and closing time intervals of DC contactors throughout their entire lifecycle. It can also simultaneously perform real-time testing on multiple DC contactors of different models and channels under the same test conditions, allowing for comparison of parameters such as service life and stability of DC contactors manufactured using different processes. The lifespan assessment method, through subsequent data processing, can also analyze design defects in the contactor's coil, contacts, and elastic devices. This is mainly achieved through the following technical approaches: (1) Description of the principle and logic of the detection system By using a programmable logic controller (PLC) to control and monitor the signals of different contactor contacts of a DC contactor, and by comparing and detecting data from the PLC software system through signal feedback, the changes in the opening and closing performance of the DC contactor throughout its entire life cycle can be statistically analyzed using the time interval data of opening and closing. When used in conjunction with aging environment testing equipment, the opening and closing performance parameters of a DC contactor can be clearly detected.

[0040] As an example, such as Figure 4 As shown, the closing and opening control logic includes: 1. The programmable controller (i.e., the programmable control system in the diagram) issues the closing (opening) signal; 2. Closing (opening) the intermediate relay; 3. The contactor coil is energized (or de-energized) and the current is shunted to the programmable controller to record the moment the coil is energized (or de-energized); 4. When the contactor contacts are closed (opened), the programmable controller records the moment and compares it with the moment when the coil is energized (de-energized) to obtain the time interval between the contactor contacts closing (opening). 5. The programmable controller sends the time interval data to the data exchange, which then sends the data to the industrial computer for data analysis, tabulation, and storage.

[0041] As an example, Table 1 describes the relevant actions and corresponding parameter data in the closing (opening) control process.

[0042] Table 1 Action parameters, data codes, and estimated time (in seconds) for each action step. The coil is energized Contactor closing A2 Auxiliary contact normally closed 1 opening time data; B3 Auxiliary contact normally closed 2 opening time data; C4 Main contact closing time data; D5 Auxiliary contact normally open 1 closing time data; E6 Auxiliary contact normally open 2 closing time data. Coil de-energized Contactor tripping Main contact opening time data F2; Auxiliary contact normally open 1 opening time data G; Auxiliary contact normally open 2 opening time data H; Auxiliary contact normally closed 1 closing time data I; Auxiliary contact normally closed 2 closing time data J (2) Building a hardware platform Preferably, a multi-channel programmable logic controller (PLC) is configured as the programmable controller, along with a multi-channel data exchange and an industrial computer with display and control software functions, and combined with aging environment testing equipment to form a multi-channel DC contactor control and testing system.

[0043] Furthermore, one or more auxiliary contactors can be configured to extend the contacts and control multiple contacts in the connected DC contactors.

[0044] This testing system addresses the limitations of current DC contactors, which can only perform individual on / off monitoring and lack multi-contact monitoring and data storage capabilities. The system can detect, store, and analyze the number of on / off cycles and engagement / release times of DC contactors. It also verifies improvements in DC contactor reliability under combined high / low temperature and vibration environments, providing a comprehensive understanding of the usage and operation of different DC contactors under various conditions (high temperature, low temperature, vibration, shock, and varying electrical stresses). The main innovations are as follows: Based on the data obtained, such as the number of switching cycles and the pull-in / release time of the DC contactor, real-time testing under the same test conditions should be conducted on different models of DC contactors to compare parameters such as service life and stability of contactors produced by different processes.

[0045] The testing system provided in this application has a simple test structure, strong practicality, high degree of automation, high accuracy, and is easy to operate. Its main function is to detect the time interval between the opening and closing of the contactor, thereby statistically analyzing the multi-channel opening and closing performance changes of the DC contactor throughout its entire life cycle through data (curves, etc.). When used in conjunction with aging environment testing equipment, it can clearly detect the effective life cycle of a DC contactor and the specific performance at each stage, which is of great significance for DC contactor manufacturers' R&D and users' selection.

[0046] The main features of this testing system are its accurate detection and full-cycle statistics of the opening and closing time intervals of multi-channel contactors. It can also simultaneously perform real-time testing on multiple contactors of different models under the same aging test conditions to compare parameters such as service life and stability of contactors produced by different processes. Through subsequent data comparison and processing, design defects in coils, contacts, and elastic devices of contactors can also be analyzed.

[0047] The technical solution provided in this application includes several programmable logic controllers (PLCs), a data exchange, and an industrial control computer. Each PLC is connected to any DC contactor to collect the opening and closing time data of the connected DC contactor. The data exchange is connected to each PLC to transmit the opening and closing time data. The industrial control computer is connected to the data exchange to perform data statistics and analysis on the opening and closing time data, determine and output the performance test results of each DC contactor, realize the accurate detection of the opening and closing time interval of multiple channels of DC contactors, and can simultaneously perform real-time detection on multiple DC contactors of different models to compare parameters such as service life and stability of DC contactors produced by different processes.

[0048] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0049] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0050] It should be noted that the above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A multi-channel DC contactor control and detection system, characterized in that, This includes several programmable logic controllers (PLCs), data switches, and industrial control computers. Each of the programmable controllers is connected to any DC contactor and is used to collect the opening and closing time data of the connected DC contactor; The data switch is connected to each of the programmable controllers and is used to transmit the opening and closing time data of each of the circuit breakers. The industrial control computer is connected to the data exchange and is used to perform data statistics and data analysis on the opening and closing time data of each of the DC contactors, determine and output the performance test results of each of the DC contactors, so as to realize the performance comparison of each of the DC contactors.

2. The system according to claim 1, characterized in that, Each of the programmable controllers is specifically used for: Send a closing command to the connected DC contactor, and receive the energizing signal of the contactor coil and the closing signal of the contactor contacts, and calculate the closing time interval; Send a tripping command to the connected DC contactor, and receive the de-energization signal of the contactor coil and the tripping signal of the contactor contacts, and calculate the tripping time interval; The closing time interval and the opening time interval are sent to the data switch.

3. The system according to claim 2, characterized in that, The system also includes one or more auxiliary contactors, each of which is connected between any pair of programmable controllers and DC contactors for contact expansion and control of multiple contacts in the connected DC contactors.

4. The system according to claim 3, characterized in that, Each of the programmable controllers is further configured to: Send a closing command to the connected auxiliary contactor, receive the energized signal of the contactor coil and the closing signal of each contact in the connected DC contactor, and calculate the closing time interval corresponding to each contact. Send a tripping command to the connected auxiliary contactor, receive the de-energization signal of the contactor coil in the connected DC contactor and the tripping signal of each contact, and calculate the tripping time interval corresponding to each contact. The closing time interval and opening time interval corresponding to each contact are sent to the data exchange.

5. The system according to claim 4, characterized in that, Each of the aforementioned auxiliary contactors is specifically used for: The circuit receives a closing command from a connected programmable controller, and closes the circuit in response to the closing command to energize the contactor coil in the connected DC contactor and control the contacts in the connected DC contactor to be closed. The circuit breaker receives a tripping command from a connected programmable controller, trips the circuit breaker in response to the tripping command, de-energizes the contactor coil in the connected DC contactor, and controls the contacts in the connected DC contactor to open.

6. The system according to claim 5, characterized in that, The industrial control computer is specifically used for: Data statistics and analysis are performed on the closing time interval and opening time interval corresponding to each contact in each DC contactor to determine and output the performance test results corresponding to each contact, so as to realize the performance comparison between different contacts in each DC contactor.

7. The system according to claim 6, characterized in that, The system also includes an aging environment testing device for placing each of the DC contactors, providing aging test conditions for each of the DC contactors, simulating long-term operating conditions, so that each of the programmable controllers can collect the opening and closing time data of the connected DC contactors under different operating conditions.

8. The system according to claim 7, characterized in that, Each of the programmable controllers is further configured to: Under different operating conditions provided by the aging environment test equipment, a closing command is sent to the connected auxiliary contactor, the energizing signal of the contactor coil and the closing signal of each contact in the connected DC contactor are received, and the closing time interval of each contact under different operating conditions is calculated. Send a tripping command to the connected auxiliary contactor, receive the de-energization signal of the contactor coil in the connected DC contactor and the tripping signal of each contact, and calculate the tripping time interval of each contact under different operating conditions. The closing and opening time intervals of each contact under different operating conditions are sent to the data exchange.

9. The system according to claim 8, characterized in that, Each of the programmable controllers is further configured to: Under the same operating conditions provided by the aging environment test equipment, a closing command is sent to the connected auxiliary contactor, the energizing signal of the contactor coil and the closing signal of the contactor contact are received from the connected DC contactor, and the closing time interval of the contactor contact under the operating conditions is calculated. Send a tripping command to the connected auxiliary contactor, receive the de-energization signal of the contactor coil in the connected DC contactor and the tripping signal of the contactor contact, and calculate the tripping time interval of the contactor contact under the operating conditions. The closing and opening time intervals of the contactor contacts under the specified operating conditions are sent to the data exchange.

10. The system according to claim 9, characterized in that, The industrial control computer is also used for: Data statistics and analysis are performed on the closing time interval and opening time interval of each contact in any DC contactor under different operating conditions. The performance test results corresponding to each contact are determined and output to achieve the performance comparison of each contact in the DC contactor throughout its entire life cycle. Alternatively, data statistics and analysis can be performed on the closing and opening time intervals of each DC contactor under the same operating conditions to determine and output the performance test results of each DC contactor under the same operating conditions, so as to achieve performance comparison of different DC contactors under the same operating conditions.

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