Low-voltage motor insulation on-line detector and detection system thereof

Abstract

The utility model provides a low-voltage motor insulation on-line detector and a detection system thereof, the low-voltage motor insulation on-line detector is provided with a main control unit, a data auxiliary acquisition unit and a plurality of detection interfaces, and the main control unit comprises a data processing module; the data auxiliary acquisition unit comprises a data acquisition module, a voltage output control module, an auxiliary contact detection module and a signal sampling processing module, the voltage output control module is connected with the data acquisition module, the auxiliary contact detection module is connected with the data acquisition module, and the signal sampling processing module is connected with the data acquisition module. The data processing module is in communication connection with the data acquisition module; the detection interfaces are respectively connected with the voltage output control module, and the high-voltage isolation relay is connected in series between the detection interfaces and the voltage output control module, thereby achieving the automatic insulation detection of the circuit of the motor through the integrated automatic design, improving the insulation detection efficiency of the circuit of the motor, and reducing the cost of manual detection.

Description

Technical Field

[0001] The utility model relates to the field of motor detection, in particular to a low-voltage motor insulation on-line detector and its detection system. Background Technique

[0002] In the verification regulations of motors, important cables must pass a withstand voltage test to measure their insulation conditions before being energized. In the existing technology, most of the withstand voltage tests of motors are manually carried out by using a megohmmeter to test the motor windings. However, in this manual detection method, the measured data is often incompletely and discontinuously recorded, which is not conducive to forming information data (such as reports, curve graphs, trend analysis, etc.). Furthermore, it increases a large amount of labor costs and reduces the safety risk of motor line detection. Content of the Utility Model

[0003] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art, and provide a low-voltage motor insulation on-line detector and its detection system. Furthermore, through an integrated automatic design, it realizes automatic insulation detection of the motor line, improves the integrity and continuity of the measured data, improves the insulation detection efficiency of the motor line, reduces the cost of manual detection, and improves the safety risk of motor line detection.

[0004] To achieve the above object, in the first aspect, an embodiment of the utility model provides a low-voltage motor insulation on-line detector, including:

[0005] A main control unit, the main control unit includes a data processing module, and the data processing module is used to process the insulation resistance signal and output a detection result;

[0006] A data auxiliary acquisition unit, the data auxiliary acquisition unit includes a data acquisition module, a voltage output control module, an auxiliary contact detection module and a signal sampling and processing module. The voltage output control module is connected to the data acquisition module, the auxiliary contact detection module is connected to the data acquisition module, the signal sampling and processing module is connected to the data acquisition module, and the data processing module is communicatively connected to the data acquisition module;

[0007] A plurality of detection interfaces, the detection interfaces are used to connect with the motor to be tested to form a motor detection loop. Each detection interface is respectively connected to the voltage output control module, and a high-voltage isolation relay is connected in series between the detection interface and the voltage output control module. The high-voltage isolation relay is used to control the conduction state between the detection interface and the voltage output control module;

[0008] Among them, the data acquisition module is used to filter the insulation resistance signal, the voltage output control module is used to output a detection voltage to the motor under test, the signal sampling and processing module is used to collect the insulation resistance signal, and the auxiliary contact detection module is used to control the closing state of the high-voltage isolation relay.

[0009] Further, in some embodiments, the signal sampling and processing module includes a first voltage signal acquisition terminal and a second voltage signal acquisition terminal. The first voltage signal acquisition terminal is respectively connected to each detection interface. The first voltage signal acquisition terminal is used to detect the voltage signal of the motor under test. The second voltage signal acquisition terminal is connected to the voltage output control module. The first voltage signal acquisition terminal is used to detect the voltage signal of the voltage output control module.

[0010] Further, in some embodiments, the insulation resistance signal collected by the signal sampling and processing module includes the voltage signal of the motor under test and the voltage signal of the voltage output control module.

[0011] Further, in some embodiments, the data auxiliary acquisition unit further includes a motor operating state detection module. The motor operating state detection module is connected to the data acquisition module. The motor operating state detection module is used to detect the operating state of the motor under test.

[0012] Further, in some embodiments, the communication method between the data auxiliary acquisition unit and the main control unit is TTL.

[0013] Further, in some embodiments, the main control unit further includes a communication module. The communication module is used to perform data communication with external components. The communication module is connected to the data processing module.

[0014] Further, in some embodiments, the communication interface of the communication module is an RS485 communication interface, and the number of RS485 communication interfaces is multiple.

[0015] Further, in some embodiments, the main control unit further includes a human-computer interaction module. The human-computer interaction module is used to perform human-computer interaction processing with the user. The human-computer interaction module is connected to the data processing module.

[0016] Further, in some embodiments, the main control unit further includes an alarm module. The alarm module is used to warn and output the detection result. The alarm module is connected to the data processing module.

[0017] To achieve the above object, in a second aspect, an embodiment of the present invention provides a low-voltage motor insulation on-line detection system, including:

[0018] Multiple motors under test;

[0019] The low-voltage motor insulation on-line detector as described in the first aspect above;

[0020] Among them, each detection interface is respectively connected to the corresponding motor to be tested to form a corresponding motor detection circuit.

[0021] A low-voltage motor insulation on-line detector and its detection system according to an embodiment of the present invention at least have the following beneficial effects: by providing a main control unit, a data auxiliary acquisition unit, and a plurality of detection interfaces, the main control unit includes a data processing module, and the data processing module is used to process the insulation resistance signal and output a detection result; the data auxiliary acquisition unit includes a data acquisition module, a voltage output control module, an auxiliary contact detection module, and a signal sampling and processing module. The voltage output control module is connected to the data acquisition module, the auxiliary contact detection module is connected to the data acquisition module, the signal sampling and processing module is connected to the data acquisition module, and the data processing module is communicatively connected to the data acquisition module; the detection interface is used to be connected to the motor to be tested to form a motor detection circuit, and each detection interface is respectively connected to the voltage output control module, and a high-voltage isolation relay is connected in series between the detection interface and the voltage output control module. The high-voltage isolation relay is used to control the conduction state between the detection interface and the voltage output control module. Among them, the data acquisition module is used to filter the insulation resistance signal, the voltage output control module is used to output a detection voltage to the motor to be tested, the signal sampling and processing module is used to collect the insulation resistance signal, and the auxiliary contact detection module is used to control the closing state of the high-voltage isolation relay. Furthermore, through an integrated automatic design, automatic insulation detection of the motor circuit is realized, the integrity and continuity of the measurement data are improved, the insulation detection efficiency of the motor circuit is improved, the cost of manual detection is reduced, and the safety risk of the motor circuit detection is increased.

[0022] Other features and advantages of the present invention will be described in the following specification, and some will become obvious from the specification. The purpose and other advantages of the present invention can be realized and obtained by the structure specifically pointed out in the specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings are used to provide a further understanding of the technical solutions of the present invention, and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation to the technical solutions of the present invention.

[0024] The present invention will be further described below in conjunction with the drawings and embodiments;

[0025] Figure 1 is the overall structure diagram of the low-voltage motor insulation on-line detector provided by some embodiments of the present invention;

[0026] Figure 2 is the overall framework diagram of the low-voltage motor insulation on-line detector provided by some embodiments of the present invention;

[0027] Figure 3 is the circuit diagram of the voltage output control module provided by some embodiments of the present utility model;

[0028] Figure 4 is the circuit diagram of the auxiliary contact detection module provided by some embodiments of the present utility model;

[0029] Figure 5 is the circuit diagram of the data processing module provided by some embodiments of the present utility model;

[0030] Figure 6 is the circuit diagram of the connection between the voltage output module and the motor to be tested provided by some embodiments of the present utility model;

[0031] Figure 7 is the circuit diagram of the motor operating state detection module provided by some embodiments of the present utility model;

[0032] Figure 8 is the circuit diagram of the communication module provided by some embodiments of the present utility model;

[0033] Figure 9 is the circuit diagram of the human-machine interaction module provided by some embodiments of the present utility model;

[0034] Figure 10 is the circuit diagram of the alarm module provided by some embodiments of the present utility model;

[0035] Figure 11 is the overall structure diagram of the on-line insulation detection system for low-voltage motors provided by some embodiments of the present utility model.

[0036] Reference numerals: on-line insulation detector for low-voltage motors 1000, main control unit 1100, data processing module 1110, communication module 1120, human-machine interaction module 1130, alarm module 1140, data auxiliary acquisition unit 1200, data acquisition module 1210, voltage output control module 1220, auxiliary contact detection module 1230, signal sampling and processing module 1240, motor operating state detection module 1250, first voltage signal acquisition terminal 1241, second voltage signal acquisition terminal 1242, detection interface 1300, high-voltage isolation relay 1400;

[0037] On-line insulation detection system for low-voltage motors 2000, motor to be tested 2100. Detailed implementation manners

[0038] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The function of the accompanying drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model. However, it should not be construed as a limitation on the protection scope of the present utility model.

[0039] In the description of the present utility model, if the first and second are described only for the purpose of distinguishing technical features, it should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features. It should be understood that such data used can be interchanged under appropriate circumstances so that the embodiments of the present utility model 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 inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0040] In the description of the present utility model, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0041] In the verification regulations of motors, important cables must pass a withstand voltage test to measure their insulation status before being energized. In the prior art, most of the withstand voltage tests of motors are manually performed on the motor windings using a megohmmeter by hand. However, in this manual detection method, the measured data is often incompletely and discontinuously recorded, which is not conducive to forming informatized data (such as reports, curve graphs, trend analysis, etc.). Furthermore, it increases a large amount of labor costs and reduces the safety risks of motor line detection.

[0042] Based on this, the embodiments of the present utility model provide a low-voltage motor insulation on-line detector and its detection system. By providing a main control unit, a data auxiliary acquisition unit, and multiple detection interfaces, the main control unit includes a data processing module, and the data processing module is used to process the insulation resistance signal and output a detection result; the data auxiliary acquisition unit includes a data acquisition module, a voltage output control module, an auxiliary contact detection module, and a signal sampling and processing module. The voltage output control module is connected to the data acquisition module, the auxiliary contact detection module is connected to the data acquisition module, the signal sampling and processing module is connected to the data acquisition module, and the data processing module is communicatively connected to the data acquisition module; the detection interface is used to connect with the motor to be tested to form a motor detection loop, and each detection interface is respectively connected to the voltage output control module. A high-voltage isolation relay is connected in series between the detection interface and the voltage output control module, and the high-voltage isolation relay is used to control the conduction state between the detection interface and the voltage output control module. Among them, the data acquisition module is used to filter the insulation resistance signal, the voltage output control module is used to output a detection voltage to the motor to be tested, the signal sampling and processing module is used to collect the insulation resistance signal, and the auxiliary contact detection module is used to control the closing state of the high-voltage isolation relay. Furthermore, through an integrated automatic design, automatic insulation detection of the motor circuit is realized, while improving the integrity and continuity of the measurement data, thereby improving the insulation detection efficiency of the motor circuit, reducing the cost of manual detection, and reducing the safety risk of motor circuit detection.

[0043] Therefore, the embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

[0044] In the first aspect, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 shown, Figure 1 is the overall structure diagram of the low-voltage motor insulation on-line detector provided by some embodiments of the present utility model, Figure 2 is the overall framework diagram of the low-voltage motor insulation on-line detector provided by some embodiments of the present utility model, Figure 3 is the circuit diagram of the voltage output control module provided by some embodiments of the present utility model, Figure 4 is the circuit diagram of the auxiliary contact detection module provided by some embodiments of the present utility model, Figure 5This is the circuit diagram of the data processing module provided by some embodiments of the present utility model. The low-voltage motor insulation on-line detector 100 includes a main control unit 1100, a data auxiliary acquisition unit 1200, and a plurality of detection interfaces 1300. The main control unit 1100 includes a data processing module 1110, and the data processing module 1110 is used to process the insulation resistance signal and output the detection result. The data auxiliary acquisition unit 1200 includes a data acquisition module 1210, a voltage output control module 1220, an auxiliary contact detection module 1230, and a signal sampling and processing module 1240. The voltage output control module 1220 is connected to the data acquisition module. The auxiliary contact detection module 1230 is connected to the data acquisition module. The signal sampling and processing module 1240 is connected to the data acquisition module. The data processing module 1110 is communicatively connected to the data acquisition module 1210. The detection interfaces 1300 are used to connect with the motor to be tested 2100 to form a motor detection circuit. Each detection interface 1300 is respectively connected to the voltage output control module 1220. A high-voltage isolation relay 1400 is connected in series between the detection interface 1300 and the voltage output control module 1220. The high-voltage isolation relay 1400 is used to control the conduction state between the detection interface 1300 and the voltage output control module 1220.

[0045] Among them, the data acquisition module 1210 is used to filter the insulation resistance signal. The voltage output control module 1220 is used to output a detection voltage to the motor to be tested 2100. The signal sampling and processing module 1240 is used to collect the insulation resistance signal. The auxiliary contact detection module 1230 is used to control the closing state of the high-voltage isolation relay 1400. Thus, through an integrated automatic design, automatic insulation detection of the motor circuit is realized, the integrity and continuity of the measurement data are improved, the insulation detection efficiency of the motor circuit is improved, the cost of manual detection is reduced, and the safety risk of the motor circuit detection is increased.

[0046] It should be noted that the voltage output control module 1220 is 500V, and the 500V voltage output control module 1220 is applicable to the insulation detection of low-voltage motors.

[0047] Further, referring to Figure 6 as shown Figure 6It is a circuit diagram of the connection between the voltage output module and the motor under test provided by some embodiments of the present utility model. The signal sampling and processing module 1240 includes a first voltage signal acquisition terminal 1241 and a second voltage signal acquisition terminal 1242. The first voltage signal acquisition terminal 1241 is respectively connected to each detection interface 1300. The first voltage signal acquisition terminal 1241 is used to detect the voltage signal of the motor under test 2100. The second voltage signal acquisition terminal 1242 is connected to the voltage output control module 1220. The first voltage signal acquisition terminal 1241 is used to detect the voltage signal of the voltage output control module 1220.

[0048] It should be noted that the insulation resistance signals collected by the signal sampling and processing module 1240 include the voltage signal of the motor under test 2100 and the voltage signal of the voltage output control module 1220.

[0049] Further, referring to Figure 2 and Figure 7 as shown, Figure 7 It is a circuit diagram of the motor operating state detection module provided by some embodiments of the present utility model. The data auxiliary acquisition unit 1200 further includes a motor operating state detection module 1250. The motor operating state detection module 1250 is connected to the data acquisition module. The motor operating state detection module 1250 is used to detect the operating state of the motor under test 2100.

[0050] It should be noted that the communication method between the data auxiliary acquisition unit 1200 and the main control unit 1100 is TTL.

[0051] Further, referring to Figure 2 and Figure 8 as shown, Figure 7 It is a circuit diagram of the data processing module provided by some embodiments of the present utility model. Figure 8 It is a circuit diagram of the communication module provided by some embodiments of the present utility model. The main control unit 1100 further includes a communication module 1120. The communication module 1120 is used for data communication with external components. The communication module 1120 is connected to the data processing module 1110.

[0052] It should be noted that the communication interface of the communication module 1120 is an RS485 communication interface. The number of RS485 communication interfaces is multiple. And the protocol of the communication module 1120 is the Modbus RTU communication protocol, so as to improve the compatibility of data transmission to multiple platforms.

[0053] Further, referring to Figure 2 and Figure 9 as shown, Figure 9It is the circuit diagram of the human-machine interaction module provided by some embodiments of the present utility model. The main control unit 1100 further includes a human-machine interaction module 1130. The human-machine interaction module 1130 is used for performing human-machine interaction processing with the user. The human-machine interaction module 1130 is connected to the data processing module 1110.

[0054] It should be noted that the human-machine interaction module 1130 includes a display (not labeled), a plurality of interaction buttons (not labeled), and a plurality of interaction indicator lights (not labeled). Among them, the display is used to display the relevant data detected by the low-voltage motor insulation on-line detector, the interaction buttons are used for the operator to operate the low-voltage motor insulation on-line detector, and the interaction indicator lights are used to display the working state of the low-voltage motor insulation on-line detector. And the interaction indicator lights are light-emitting diodes.

[0055] Further, referring to Figure 2 and Figure 10 as shown, Figure 10 It is the circuit diagram of the alarm module provided by some embodiments of the present utility model. The main control unit 1100 further includes an alarm module 1140. The alarm module 1140 is used for warning and outputting the detection result. The alarm module 1140 is connected to the data processing module 1110.

[0056] It should be noted that the alarm module 1140 includes an alarm indicator light (not labeled), and the alarm indicator light is used to display the alarm signal.

[0057] In the second aspect, referring to Figure 11 as shown, the embodiments of the present utility model propose a low-voltage motor insulation on-line detection system 2000, including: a plurality of motors to be detected 2100 and the low-voltage motor insulation on-line detector 1000 in the first aspect above; wherein, each detection interface 1300 is respectively connected to the corresponding motor to be detected 2100 to form a corresponding motor detection circuit.

[0058] In some possible embodiments, the insulation detection of the above-mentioned on-line detector 1000 for low-voltage motor on the motor 2100 to be measured is described as follows. The motor operating state detection module 1250 detects whether the current motor 2100 to be measured is in an operating state. If so, the main control unit 1100 controls the motor 2100 to be measured to stop. After the motor 2100 to be measured is in a stopped state, the auxiliary contact detection module 1230 controls the high-voltage isolation relay to be in a closed state so that the motor detection circuit is in a locked state. Then, the voltage output control module 1220 outputs a DC high voltage to the motor 2100 to be measured. Next, the signal sampling and processing module 1240 continuously collects the voltage signal of the motor 2100 to be measured and the voltage signal of the voltage output control module 1220 in the motor detection circuit. Further, the data acquisition module 1210 filters the voltage signal of the motor 2100 to be measured and the voltage signal of the voltage output control module 1220 and sends them to the data processing module 1110. Then, the data processing module 1110 calculates the difference between the voltage of the motor 2100 to be measured and the voltage of the voltage output control module 1220, and calculates the insulation resistance value of the motor 2100 to be measured based on this difference. Finally, the insulation resistance value of the motor 2100 to be measured is displayed through the human-machine interaction module 1130.

[0059] It should be noted that the on-line detector 1000 for low-voltage motor insulation can also judge the insulation moisture absorption ability of the motor 2100 to be measured by measuring the absorption ratio, polarization index and insulation resistance value of the motor 2100 to be measured. Among them, the absorption ratio is the ratio of the change in the insulation resistance of the motor 2100 to be measured detected by the on-line detector 1000 for low-voltage motor insulation for 60 seconds to the change in the insulation resistance of the motor 2100 to be measured for 15 seconds; the polarization index is the ratio of the change in the insulation resistance of the motor 2100 to be measured detected by the on-line detector 1000 for low-voltage motor insulation for 10 minutes to the change in the insulation resistance of the motor 2100 to be measured for 1 minute.

[0060] It should be understood that in the present utility model, "at least one (item)" means one or more, and "a plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships can exist. For example, "A and / or B" can mean: only A exists, only B exists, and both A and B exist at the same time. Among them, A and B can be singular or plural. The character " / " generally means that the associated objects before and after are in an "or" relationship. "At least one (piece) of the following" or its similar expression means any combination of these items, including any combination of single item (piece) or plural items (pieces). For example, at least one (piece) of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0061] In several embodiments provided by the present utility model, it should be understood that the disclosed systems and principle methods can be implemented in other ways. For example, the system embodiments described above are merely illustrative. For example, the division of the above-mentioned units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections between each other can be through some interfaces, and the indirect couplings or communication connections of devices or units can be in electrical, mechanical or other forms.

[0062] The units described above as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place, or can be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0063] In addition, in each embodiment of the present utility model, each functional unit can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0064] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present utility model, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes multiple instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in each embodiment of the present utility model.

[0065] The above has described the embodiments of the present utility model in detail with reference to the drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of the present utility model.

Claims

1. A low voltage motor insulation online detector, characterized in that: include: A main control unit, the main control unit comprising a data processing module, the data processing module being used to process the insulation resistance signal and output the detection result; A data auxiliary acquisition unit, the data auxiliary acquisition unit includes a data acquisition module, a voltage output control module, an auxiliary contact detection module and a signal sampling and processing module, the voltage output control module is connected to the data acquisition module, the auxiliary contact detection module is connected to the data acquisition module, the signal sampling and processing module is connected to the data acquisition module, and the data processing module is communicatively connected to the data acquisition module; A plurality of detection interfaces, wherein the detection interfaces are used to connect with the motor to be tested to form a motor detection loop, each of the detection interfaces is respectively connected to the voltage output control module, a high-voltage isolation relay is connected in series between the detection interface and the voltage output control module, and the high-voltage isolation relay is used to control the conduction state between the detection interface and the voltage output control module; Among them, the data acquisition module is used to filter the insulation resistance signal, the voltage output control module is used to output the detection voltage to the motor to be tested, the signal sampling and processing module is used to collect the insulation resistance signal, and the auxiliary contact detection module is used to control the closing state of the high-voltage isolation relay.

2. The low-voltage motor insulation online detector according to claim 1 is characterized in that: The signal sampling and processing module includes a first voltage signal acquisition end and a second voltage signal acquisition end, the first voltage signal acquisition end is respectively connected to each of the detection interfaces, the first voltage signal acquisition end is used to detect the voltage signal of the motor to be tested, the second voltage signal acquisition end is connected to the voltage output control module, and the first voltage signal acquisition end is used to detect the voltage signal of the voltage output control module.

3. The low-voltage motor insulation online detector according to claim 2 is characterized in that: The insulation resistance signal collected by the signal sampling and processing module includes the voltage signal of the motor to be tested and the voltage signal of the voltage output control module.

4. The low-voltage motor insulation online detector according to claim 1 is characterized in that: The auxiliary data acquisition unit further includes a motor operation status detection module, which is connected to the data acquisition module and is used to detect the operation status of the motor to be tested.

5. The low-voltage motor insulation online detector according to claim 1 is characterized in that: The communication mode between the data auxiliary acquisition unit and the main control unit is TTL.

6. The low-voltage motor insulation online detector according to claim 1, characterized in that: The main control unit further comprises a communication module, which is used for data communication with external components and is connected to the data processing module.

7. The low-voltage motor insulation online detector according to claim 6, characterized in that: The communication interface of the communication module is an RS485 communication interface, and the number of the RS485 communication interfaces is multiple.

8. The low-voltage motor insulation online detector according to claim 1, characterized in that: The main control unit also includes a human-computer interaction module, which is used to perform human-computer interaction processing with a user, and the human-computer interaction module is connected to the data processing module.

9. The low-voltage motor insulation online detector according to claim 1, characterized in that: The main control unit further comprises an alarm module, which is used to warn the output detection result, and the alarm module is connected to the data processing module.

10. A low voltage motor insulation online detection system, characterized in that: include: Multiple motors to be tested; The low-voltage motor insulation online detector according to any one of claims 1 to 9; Wherein, each of the detection interfaces is respectively connected to the corresponding motor to be tested to form a corresponding motor detection circuit.

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