Centralized on-line monitoring device for sheath protector

Abstract

The utility model relates to a monitoring device for a sheath protector, in particular to an online monitoring device for a centralized sheath protector. Comprising a plurality of monitoring modules and a monitoring cabinet connected with the plurality of monitoring modules. The monitoring module is connected with the grounding end of the cable sheath protector; the monitoring cabinet comprises a control cabinet and a power distribution cabinet. A server, and a display, a keyboard, a mouse and a switch which are connected with the server are arranged in the control cabinet; a power supply module, a serial port exchanger, and an acquisition module and an equipment dehumidification module which are connected with the serial port exchanger are arranged in the power distribution cabinet, and the power supply module supplies power to the serial port exchanger, the acquisition module and the equipment dehumidification module; the serial port exchanger is connected with the switch; the acquisition module is connected with the plurality of monitoring modules. According to the utility model, the working state of the cable sheath protector is monitored in real time, so that maintenance personnel can replace the faulty cable sheath protector in time, and property loss and safety problems caused by burning loss of a cable line are avoided.

Description

Technical Field

[0001] This utility model relates to a sheath protector monitoring device, specifically a centralized online monitoring device for sheath protectors. Background Technology

[0002] Currently, most cable sheath protectors on the market use zinc oxide varistors or zinc oxide varistors as protective elements. During long-term operation, due to poor sealing in outdoor environments, internal moisture absorption or aging of the varistors can lead to a gradual decrease in insulation performance. In such cases, the total current and resistive current of the equipment will increase significantly, resulting in a series of problems such as voltage instability. Furthermore, overvoltage or power frequency short circuits can cause thermal collapse and damage to the zinc oxide varistors.

[0003] In current technology, cable sheath protectors can only be maintained through simple visual inspections, such as cleaning the porcelain bushing, checking for surface cracks, or conducting periodic tests. These subtle inspections are insufficient to detect cable sheath protector malfunctions in a timely manner. Failure to promptly identify and replace faulty cable sheath protectors can lead to cable line burnout, resulting in property damage and posing a significant threat to the safety of equipment operation and maintenance personnel. Utility Model Content

[0004] The purpose of this invention is to solve the technical problem that existing methods cannot detect faults in cable sheath protectors in a timely manner, thus posing a safety hazard, and to provide a centralized online monitoring device for cable sheath protectors.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] A centralized online monitoring device for sheath protectors includes multiple monitoring modules and a monitoring cabinet connected to the multiple monitoring modules;

[0007] The monitoring module is connected to the grounding terminal of the cable sheath protector;

[0008] The monitoring cabinet includes a control cabinet and a power distribution cabinet; the control cabinet is equipped with a server, as well as a monitor, keyboard, mouse and switch connected to the server;

[0009] The power distribution cabinet is equipped with a power supply module, a serial port switch, and a data acquisition module and a device dehumidification module connected to the serial port switch. The power supply module provides power to the serial port switch, the data acquisition module and the device dehumidification module.

[0010] The serial port switch is connected to the switch; the acquisition module is connected to multiple monitoring modules.

[0011] Furthermore, the monitoring module includes a housing with a mounting hole in the middle, and two symmetrically distributed wiring terminals are provided on the outer side wall of the housing;

[0012] The housing contains a PCB board, on which an interface module connected to two wiring terminals and a multi-channel monitoring circuit connected to the interface module are provided.

[0013] The monitoring circuit includes a signal detection module and a communication module connected to the interface module, as well as an MCU data processing module;

[0014] A current sampling module and a comparison counting module are connected in parallel between the signal detection module and the MCU data processing module;

[0015] A comparison level output module is provided between the MCU data processing module and the comparison counting module.

[0016] Furthermore, the signal detection module includes an operational amplifier U1;

[0017] The first pin of operational amplifier U1 is connected to the second and fifth pins through resistors R37 and R45, respectively.

[0018] The third pin of operational amplifier U1 is connected to one end of resistor R101, and the other end of resistor R101 is connected to the interface module and grounded through resistors R102 and R103.

[0019] The fourth pin of operational amplifier U1 is grounded through capacitor C172;

[0020] The fifth pin of operational amplifier U1 is connected to the comparator counting module;

[0021] The sixth pin of operational amplifier U1 is connected to one end of resistor R5, and the other end of resistor R5 is connected to the current sampling module and the seventh pin.

[0022] The eighth pin of operational amplifier U1 is grounded through capacitor C11.

[0023] Furthermore, the current sampling module includes a resistor R16, one end of which is connected to the seventh pin of the operational amplifier U1, and the other end of which is connected to the MCU data processing module and grounded through a capacitor C96.

[0024] Furthermore, the comparison counting module includes a comparator T1;

[0025] The first pin of comparator T1 is connected to the third pin through resistor R17, and the first pin is also connected to the MCU data processing module and one end of resistor R99; the other end of resistor R99 is connected to the MCU data processing module and grounded through capacitor C1.

[0026] The second pin of comparator T1 is grounded and connected to the fourth pin through capacitor C80;

[0027] The third pin of comparator T1 is connected to one end of resistor R18 and grounded through capacitor C8, while the other end of resistor R18 is connected to the fifth pin of operational amplifier U1.

[0028] The fourth pin of comparator T1 is connected to the comparison level output module through resistor R66;

[0029] The fifth pin of comparator T1 is grounded through capacitor C10.

[0030] Furthermore, the comparison level output module includes a DAC digital-to-analog converter U2;

[0031] The first pin of the DAC digital-to-analog converter U2 is grounded through capacitor C9;

[0032] The second pin of the DAC digital-to-analog converter U2 is connected to resistor R66;

[0033] Pins 6, 13, 14, and 16 of the DAC digital-to-analog converter U2 are connected to the MCU data processing module.

[0034] Furthermore, the communication module includes a transceiver U10 and a common-mode filter L10;

[0035] A series capacitor C101 and a parallel capacitor C102 are connected between the first pin and the second pin of transceiver U10;

[0036] The third pin of transceiver U10 is connected to the MCU data processing module through resistor R100;

[0037] The fourth and fifth pins of transceiver U10 are connected, and are connected to the MCU data processing module through resistor R76;

[0038] The sixth pin of transceiver U10 is connected to the MCU data processing module through resistor R77;

[0039] Pins 7, 8, 9, and 10 of transceiver U10 are grounded;

[0040] The twelfth pin of transceiver U10 is connected to the fourth pin of common-mode filter L10, and the thirteenth pin is connected to the first pin of common-mode filter L10.

[0041] A series capacitor C103 and a parallel capacitor C104 are connected between the fifteenth and sixteenth pins of transceiver U10;

[0042] A resistor R73 is connected in series between the first and fourth pins of the common-mode filter L10, and the first pin is grounded through a resistor R71.

[0043] The second and third pins of the common-mode filter L10 are connected to the interface module, and a transient suppression diode D6 is connected in series between the second and third pins.

[0044] The second and third pins of the common-mode filter L10 are grounded through transient suppression diodes D5 and D7, respectively.

[0045] Furthermore, the MCU data processing module includes microcontrollers U6.1 and U6.2;

[0046] Pin 28 of the microcontroller U6.1 is connected to resistor R16;

[0047] Pin 77 of the microcontroller U6.1 is connected to resistor R99;

[0048] Pins 68, 69, and 70 of the microcontroller U6.1 are connected to resistors R77, R100, and R76, respectively.

[0049] Pins 38, 39, and 40 of the microcontroller U6.1 are connected to pins 16, 14, and 13 of the DAC digital-to-analog converter U2, respectively.

[0050] The 59th pin of the microcontroller U6.1 is connected to the first pin of the comparator T1;

[0051] The twentieth pin of the microcontroller U6.2 is connected to the sixth pin of the DAC digital-to-analog converter U2.

[0052] Furthermore, the grounding terminal of the cable sheath protector is provided with an external thread;

[0053] The housing is fitted onto the grounding end of the cable sheath protector, and two fixing nuts distributed on both sides of the housing are threaded onto the grounding end of the cable sheath protector.

[0054] Furthermore, a grounding element is provided on the external thread of the grounding terminal of the cable sheath protector;

[0055] The grounding component includes a grounding plate with through holes and a grounding nut;

[0056] The grounding plate is fitted onto the grounding terminal of the cable sheath protector through a through hole and is fixed by a grounding nut.

[0057] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0058] The centralized online monitoring device for cable sheath protectors provided by this utility model, by setting a monitoring module at the grounding end of the cable sheath protector, facilitates the detection of leakage current and discharge action count of the cable sheath protector. The data is then uploaded to a server via a data acquisition module, serial port switch, and exchange, and the display shows the cable sheath protector experiencing leakage. This facilitates real-time monitoring of the working status of the cable sheath protector, enabling maintenance personnel to replace faulty cable sheath protectors in a timely manner, thereby avoiding property damage and safety issues caused by cable line burnout. Furthermore, by setting multiple monitoring modules, multiple cable sheath protectors can be monitored. Attached Figure Description

[0059] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0060] Figure 2 This is a schematic diagram of the control cabinet in an embodiment of the present utility model;

[0061] Figure 3 This is a schematic diagram of the power distribution cabinet in an embodiment of the present utility model;

[0062] Figure 4 This is a schematic diagram of the monitoring module in an embodiment of the present invention;

[0063] Figure 5 This is a structural block diagram of the monitoring circuit in an embodiment of the present invention;

[0064] Figure 6 This is a schematic diagram of the circuit structure of the signal detection module in an embodiment of the present invention;

[0065] Figure 7 This is a schematic diagram of the circuit structure of the current sampling module in an embodiment of this utility model;

[0066] Figure 8 This is a schematic diagram of the circuit structure of the comparison counting module in an embodiment of this utility model;

[0067] Figure 9 This is a schematic diagram of the circuit structure of the comparison level output module in an embodiment of the present invention;

[0068] Figure 10 This is a schematic diagram of the circuit structure of the communication module in an embodiment of this utility model;

[0069] Figure 11 This is a schematic diagram of the circuit structure of the microcontroller U6.1 in the MCU data processing module of this utility model embodiment;

[0070] Figure 12 This is a schematic diagram of the circuit structure of the microcontroller U6.2 in the MCU data processing module in this embodiment of the present invention;

[0071] Figure 13 This is a schematic diagram of the circuit structure of the interface module in an embodiment of this utility model;

[0072] Figure 14 This is a schematic diagram of the grounding terminal of the cable sheath protector in an embodiment of this utility model.

[0073] Explanation of reference numerals in the attached diagram: 1-Monitoring module, 2-Control cabinet, 3-Power distribution cabinet, 4-Server, 5-Monitor, 6-Keyboard, 7-Switch, 8-Power supply module, 9-Serial port switch, 10-Acquisition module, 11-Equipment dehumidification module, 12-Housing, 121-Mounting hole, 13-Terminal block, 14-Cable sheath protector, 15-Fixing nut, 16-Grounding component, 161-Grounding plate, 162-Grounding nut. Detailed Implementation

[0074] The technical solutions of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0075] like Figure 1 As shown, a centralized cable sheath protector online monitoring device includes multiple monitoring modules 1 and a monitoring cabinet connected to the multiple monitoring modules 1; the monitoring modules 1 are connected to the grounding terminal of the cable sheath protector 14.

[0076] The monitoring cabinet includes control cabinet 2 and power distribution cabinet 3; such as Figure 2 As shown, control cabinet 2 contains server 4, and a monitor 5, keyboard 6, mouse, and switch 7 connected to server 4; Figure 3 As shown, the power distribution cabinet 3 is equipped with a power supply module 8, a serial port switch 9, and a data acquisition module 10 and a device dehumidification module 11 connected to the serial port switch 9. The power supply module 8 supplies power to the serial port switch 9, the data acquisition module 10 and the device dehumidification module 11; the serial port switch 9 is connected to the switch 7; and the data acquisition module 10 is connected to multiple monitoring modules 1.

[0077] In practical applications, a monitoring module 1 is set on the grounding terminal of multiple cable sheath protectors 14 respectively; the monitoring module 1 monitors the leakage current and discharge action number of the cable sheath protectors 14; the leakage current and discharge action number of the cable sheath protectors 14 obtained by the monitoring module 1 are uploaded to the server 4 through the acquisition module 10, serial port switch 9, and switch 7, and the display 5 displays the cable sheath protectors 14 that have leakage.

[0078] like Figure 4 As shown, the monitoring module 1 includes a housing 12 with a mounting hole 121 in the middle, and two symmetrically distributed wiring terminals 13 on the outer side wall of the housing 12; a PCB board is provided inside the housing 12, and an interface module connected to the two wiring terminals 13 and a multi-channel monitoring circuit connected to the interface module are provided on the PCB board; as shown Figure 5 As shown, the monitoring circuit includes a signal detection module and a communication module connected to the interface module, as well as an MCU data processing module; a current sampling module and a comparison counting module are connected in parallel between the signal detection module and the MCU data processing module; a comparison level output module is provided between the MCU data processing module and the comparison counting module.

[0079] In practical applications, the monitoring module 1 is connected to the grounding terminal of the cable sheath protector 14 through the wiring terminal 13; the leakage current standard value is set to the comparison level output module through the MCU data processing module, and the leakage current standard value is transmitted to the comparison counting module by the comparison level output module.

[0080] During the monitoring process, the signal detection module detects the current generated at the grounding terminal of the cable sheath protector 14, and the current sampling module collects the current information generated at the grounding terminal of the cable sheath protector 14 and uploads it to the MCU data processing module. At the same time, the comparison and counting module compares the current information with the standard value of leakage current. If they match, the current is recorded as leakage current. The comparison and counting module outputs the number of leakage current discharges and transmits it to the MCU data processing module. The MCU data processing module transmits the leakage current and the number of leakage current discharge actions to the monitoring cabinet through the communication module and interface module.

[0081] like Figure 13 As shown, the interface module includes interface connectors J1 and J2; used to connect to the signal detection module and the communication module.

[0082] like Figure 6 As shown, the signal detection module includes an operational amplifier U1;

[0083] The first pin of operational amplifier U1 is connected to the second and fifth pins through resistors R37 and R45, respectively.

[0084] The third pin of operational amplifier U1 is connected to one end of resistor R101, and the other end of resistor R101 is connected to the interface module and grounded through resistors R102 and R103.

[0085] The fourth pin of operational amplifier U1 is grounded through capacitor C172;

[0086] The fifth pin of operational amplifier U1 is connected to the comparator counting module;

[0087] The sixth pin of operational amplifier U1 is connected to one end of resistor R5, and the other end of resistor R5 is connected to the current sampling module and the seventh pin.

[0088] The eighth pin of operational amplifier U1 is grounded through capacitor C11.

[0089] like Figure 7 As shown, the current sampling module includes a resistor R16. One end of the resistor R16 is connected to the seventh pin of the operational amplifier U1, and the other end of the resistor R16 is connected to the MCU data processing module and grounded through a capacitor C96.

[0090] like Figure 8 As shown, the comparison counting module includes a comparator T1;

[0091] The first pin of comparator T1 is connected to the third pin through resistor R17, and the first pin is also connected to the MCU data processing module and one end of resistor R99; the other end of resistor R99 is connected to the MCU data processing module and grounded through capacitor C1.

[0092] The second pin of comparator T1 is grounded and connected to the fourth pin through capacitor C80;

[0093] The third pin of comparator T1 is connected to one end of resistor R18 and grounded through capacitor C8, while the other end of resistor R18 is connected to the fifth pin of operational amplifier U1.

[0094] The fourth pin of comparator T1 is connected to the comparison level output module through resistor R66;

[0095] The fifth pin of comparator T1 is grounded through capacitor C10.

[0096] like Figure 9 As shown, the comparison level output module includes a DAC digital-to-analog converter U2;

[0097] The first pin of the DAC digital-to-analog converter U2 is grounded through capacitor C9;

[0098] The second pin of the DAC digital-to-analog converter U2 is connected to resistor R66;

[0099] Pins 6, 13, 14, and 16 of the DAC digital-to-analog converter U2 are connected to the MCU data processing module.

[0100] like Figure 10 As shown, the communication module includes a transceiver U10 and a common-mode filter L10;

[0101] A series capacitor C101 and a parallel capacitor C102 are connected between the first pin and the second pin of transceiver U10;

[0102] The third pin of transceiver U10 is connected to the MCU data processing module through resistor R100;

[0103] The fourth and fifth pins of transceiver U10 are connected, and are connected to the MCU data processing module through resistor R76;

[0104] The sixth pin of transceiver U10 is connected to the MCU data processing module through resistor R77;

[0105] Pins 7, 8, 9, and 10 of transceiver U10 are grounded;

[0106] The twelfth pin of transceiver U10 is connected to the fourth pin of common-mode filter L10, and the thirteenth pin is connected to the first pin of common-mode filter L10.

[0107] A series capacitor C103 and a parallel capacitor C104 are connected between the fifteenth and sixteenth pins of transceiver U10;

[0108] A resistor R73 is connected in series between the first and fourth pins of the common-mode filter L10, and the first pin is grounded through a resistor R71.

[0109] The second and third pins of the common-mode filter L10 are connected to the interface module, and a transient suppression diode D6 is connected in series between the second and third pins.

[0110] The second and third pins of the common-mode filter L10 are grounded through transient suppression diodes D5 and D7, respectively.

[0111] like Figure 11 and Figure 12 As shown, the MCU data processing module includes microcontrollers U6.1 and U6.2;

[0112] Pin 28 of the microcontroller U6.1 is connected to resistor R16;

[0113] Pin 77 of the microcontroller U6.1 is connected to resistor R99;

[0114] Pins 68, 69, and 70 of the microcontroller U6.1 are connected to resistors R77, R100, and R76, respectively.

[0115] Pins 38, 39, and 40 of the microcontroller U6.1 are connected to pins 16, 14, and 13 of the DAC digital-to-analog converter U2, respectively.

[0116] The 59th pin of the microcontroller U6.1 is connected to the first pin of the comparator T1;

[0117] The twentieth pin of the microcontroller U6.2 is connected to the sixth pin of the DAC digital-to-analog converter U2.

[0118] It also includes a power supply module for powering the signal detection module, the comparison counting module, the comparison level output module, the MCU data processing module, and the communication module.

[0119] like Figure 14 As shown, the grounding terminal of the cable sheath protector 14 is provided with an external thread; the housing 12 is sleeved on the grounding terminal of the cable sheath protector 14, and two fixing nuts 15 distributed on both sides of the housing 12 are threaded on the grounding terminal of the cable sheath protector 14.

[0120] like Figure 14 As shown, the grounding end of the cable sheath protector 14 is provided with a grounding component 16 on its external thread; the grounding component 16 includes a grounding plate 161 with a through hole and a grounding nut 162; the grounding plate 161 is sleeved on the grounding end of the cable sheath protector 14 through the through hole and is fixed by the grounding nut 162.

[0121] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A centralized online monitoring device for sheath protectors, characterized in that: It includes multiple monitoring modules (1) and a monitoring cabinet connected to the multiple monitoring modules (1); The monitoring module (1) is connected to the grounding terminal of the cable sheath protector (14); The monitoring cabinet includes a control cabinet (2) and a power distribution cabinet (3); the control cabinet (2) is equipped with a server (4), and a monitor (5), keyboard (6), mouse and switch (7) connected to the server (4); The power distribution cabinet (3) is equipped with a power supply module (8), a serial port switch (9), and a data acquisition module (10) and a device dehumidification module (11) connected to the serial port switch (9). The power supply module (8) supplies power to the serial port switch (9), the data acquisition module (10) and the device dehumidification module (11). The serial port switch (9) is connected to the switch (7); the acquisition module (10) is connected to multiple monitoring modules (1).

2. The centralized sheath protector online monitoring device according to claim 1, characterized in that: The monitoring module (1) includes a housing (12) with a mounting hole (121) in the middle, and two symmetrically distributed wiring terminals (13) are provided on the outer side wall of the housing (12); The housing (12) is provided with a PCB board, and the PCB board is provided with an interface module connected to two wiring terminals (13) and a multi-channel monitoring circuit connected to the interface module; The monitoring circuit includes a signal detection module and a communication module connected to the interface module, as well as an MCU data processing module; A current sampling module and a comparison counting module are connected in parallel between the signal detection module and the MCU data processing module; A comparison level output module is provided between the MCU data processing module and the comparison counting module.

3. The centralized sheath protector online monitoring device according to claim 2, characterized in that: The signal detection module includes an operational amplifier U1; The first pin of operational amplifier U1 is connected to the second and fifth pins through resistors R37 and R45, respectively. The third pin of operational amplifier U1 is connected to one end of resistor R101, and the other end of resistor R101 is connected to the interface module and grounded through resistors R102 and R103. The fourth pin of operational amplifier U1 is grounded through capacitor C172; The fifth pin of operational amplifier U1 is connected to the comparator counting module; The sixth pin of operational amplifier U1 is connected to one end of resistor R5, and the other end of resistor R5 is connected to the current sampling module and the seventh pin. The eighth pin of operational amplifier U1 is grounded through capacitor C11.

4. The centralized sheath protector online monitoring device according to claim 3, characterized in that: The current sampling module includes a resistor R16. One end of the resistor R16 is connected to the seventh pin of the operational amplifier U1, and the other end of the resistor R16 is connected to the MCU data processing module and grounded through a capacitor C96.

5. The centralized sheath protector online monitoring device according to claim 4, characterized in that: The comparison counting module includes a comparator T1; The first pin of comparator T1 is connected to the third pin through resistor R17, and the first pin is also connected to the MCU data processing module and one end of resistor R99; the other end of resistor R99 is connected to the MCU data processing module and grounded through capacitor C1. The second pin of comparator T1 is grounded and connected to the fourth pin through capacitor C80; The third pin of comparator T1 is connected to one end of resistor R18 and grounded through capacitor C8, while the other end of resistor R18 is connected to the fifth pin of operational amplifier U1. The fourth pin of comparator T1 is connected to the comparison level output module through resistor R66; The fifth pin of comparator T1 is grounded through capacitor C10.

6. The centralized sheath protector online monitoring device according to claim 5, characterized in that: The comparison level output module includes a DAC digital-to-analog converter U2; The first pin of the DAC digital-to-analog converter U2 is grounded through capacitor C9; The second pin of the DAC digital-to-analog converter U2 is connected to resistor R66; Pins 6, 13, 14, and 16 of the DAC digital-to-analog converter U2 are connected to the MCU data processing module.

7. The centralized sheath protector online monitoring device according to claim 6, characterized in that: The communication module includes a transceiver U10 and a common-mode filter L10; A series capacitor C101 and a parallel capacitor C102 are connected between the first pin and the second pin of transceiver U10; The third pin of transceiver U10 is connected to the MCU data processing module through resistor R100; The fourth and fifth pins of transceiver U10 are connected, and are connected to the MCU data processing module through resistor R76; The sixth pin of transceiver U10 is connected to the MCU data processing module through resistor R77; Pins 7, 8, 9, and 10 of transceiver U10 are grounded; The twelfth pin of transceiver U10 is connected to the fourth pin of common-mode filter L10, and the thirteenth pin is connected to the first pin of common-mode filter L10. A series capacitor C103 and a parallel capacitor C104 are connected between the fifteenth and sixteenth pins of transceiver U10; A resistor R73 is connected in series between the first and fourth pins of the common-mode filter L10, and the first pin is grounded through a resistor R71. The second and third pins of the common-mode filter L10 are connected to the interface module, and a transient suppression diode D6 is connected in series between the second and third pins. The second and third pins of the common-mode filter L10 are grounded through transient suppression diodes D5 and D7, respectively.

8. The centralized sheath protector online monitoring device according to claim 7, characterized in that: The MCU data processing module includes microcontrollers U6.1 and U6.2; Pin 28 of the microcontroller U6.1 is connected to resistor R16; Pin 77 of the microcontroller U6.1 is connected to resistor R99; Pins 68, 69, and 70 of the microcontroller U6.1 are connected to resistors R77, R100, and R76, respectively. Pins 38, 39, and 40 of the microcontroller U6.1 are connected to pins 16, 14, and 13 of the DAC digital-to-analog converter U2, respectively. The 59th pin of the microcontroller U6.1 is connected to the first pin of the comparator T1; The twentieth pin of the microcontroller U6.2 is connected to the sixth pin of the DAC digital-to-analog converter U2.

9. The centralized sheath protector online monitoring device according to claim 2, characterized in that: The grounding terminal of the cable sheath protector (14) is provided with an external thread; The housing (12) is sleeved on the grounding end of the cable sheath protector (14), and two fixing nuts (15) distributed on both sides of the housing (12) are threaded on the grounding end of the cable sheath protector (14).

10. The centralized sheath protector online monitoring device according to claim 9, characterized in that: The cable sheath protector (14) is provided with a grounding component (16) on the external thread of the grounding end; The grounding component (16) includes a grounding plate (161) with a through hole and a grounding nut (162); The grounding plate (161) is sleeved on the grounding end of the cable sheath protector (14) through the through hole and fixed by the grounding nut (162).

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