Modular grounding box for multi-circuit high voltage cable concentration grounding

Abstract

The application provides a modular grounding box for multi-path high-voltage cable centralized grounding, comprising a box body, a plurality of independent compartments are arranged in the box body, protector grounding units or direct grounding units are arranged in the compartments, each protector grounding unit or direct grounding unit is connected with the grounding wire of the copper shielding layer and the armored layer of the corresponding high-voltage cable, a centralized grounding unit and a centralized monitoring unit are further arranged in the box body, the centralized grounding unit is used for grounding of each protector grounding unit and direct grounding unit, and the centralized monitoring unit is used for analyzing the operation state of the high-voltage cable and equipment. The application avoids signal mutual crosstalk between the grounding units by designing a plurality of independent compartments in the box body, improves the maintenance efficiency of the high-voltage cable grounding box, facilitates centralized maintenance of the grounding box, reduces the investment cost, and simultaneously solves the problem of multiple grounding point faults caused by multi-point distributed installation.

Description

Technical Field

[0001] This invention relates to the field of high-voltage cable grounding technology, and in particular to a modular grounding box for centralized grounding of multiple high-voltage cables. Background Technology

[0002] In power grids and railway power supply systems, when lightning surges, internal overvoltages, or system short-circuit faults occur, the metallic sheath and armor of high-voltage cables will generate overvoltages or overcurrents. Therefore, high-voltage cables employ a design where one end of the metallic sheath and armor is directly grounded, and the other end is grounded via a protector. The overvoltage induced in the metallic sheath and armor is absorbed by the protector at its grounding terminal, preventing prolonged overvoltage from causing cable breakdown and short-circuit faults. The overcurrent induced in the metallic sheath and armor flows into the ground through the directly grounded terminal, preventing prolonged overcurrent from burning out the cable. This provides protection against induced overvoltage and overcurrent in high-voltage cables. Therefore, high-voltage cable grounding boxes are divided into direct grounding boxes and protector grounding boxes.

[0003] Typically, substations or transformer substations contain dozens of high-voltage cables. Currently, each cable is equipped with a separate grounding box, installed locally and typically in the cable room of the high-voltage switchgear or on the wall bracket of the cable tray. This traditional grounding box installation method has the following main drawbacks:

[0004] 1) The numerous and dispersed grounding points make cable maintenance and repair work difficult, time-consuming, and labor-intensive;

[0005] 2) The installation method inside the high-voltage switchgear requires power outages during cable maintenance and repair, which seriously affects the reliability of power supply;

[0006] 3) The localized multi-point decentralized installation method creates multiple potential grounding point faults, which increases the probability of failure.

[0007] Therefore, there is an urgent need to invent a modular grounding box with centralized grounding to solve the above problems. Summary of the Invention

[0008] This invention proposes a modular grounding box for centralized grounding of multiple high-voltage cables, which solves the problems of high difficulty in cable operation and maintenance, low power supply reliability, and high probability of grounding point failure in the existing technology of grounding boxes with multi-point decentralized installation.

[0009] The technical solution of this invention is implemented as follows:

[0010] This invention provides a modular grounding box for centralized grounding of multiple high-voltage cables, comprising a box body with multiple independent compartments. Each compartment contains a protector grounding unit or a direct grounding unit, and each protector grounding unit or direct grounding unit is connected to the grounding wire of the copper shielding layer and armor layer of the corresponding high-voltage cable. The box body also contains a centralized grounding unit and a centralized monitoring unit. The centralized grounding unit extends into each compartment and is used for grounding each protector grounding unit and direct grounding unit. The centralized monitoring unit is connected to each protector grounding unit and direct grounding unit to acquire voltage and current data collected by each protector grounding unit and direct grounding unit, and to analyze the operating status of the high-voltage cables and equipment based on the acquired data.

[0011] Specifically, the protector grounding unit includes a protector, a first current sensor, a voltage sensor, a first current acquisition terminal block, and a voltage acquisition terminal block. The first current sensor is connected in series with the protector, and the voltage sensor is connected in parallel with the protector. One end of the protector is connected to the centralized grounding unit, and the other end is connected to the grounding wire of the copper shield layer of the high-voltage cable or the grounding wire of the armor layer of the high-voltage cable. One end of the first current acquisition terminal block is connected to the first current sensor, and the other end is connected to the centralized monitoring unit. One end of the voltage acquisition terminal block is connected to the voltage sensor, and the other end is connected to the centralized monitoring unit.

[0012] Specifically, the direct grounding unit includes a second current sensor and a second current acquisition terminal block. The second current sensor is installed on the grounding wire of the copper shield layer of the high-voltage cable or the grounding wire of the armor layer of the high-voltage cable, and the grounding wire of the copper shield layer of the high-voltage cable or the grounding wire of the armor layer of the high-voltage cable is directly connected to the centralized grounding unit. One end of the second current acquisition terminal block is connected to the second current sensor, and the other end is connected to the centralized monitoring unit.

[0013] Specifically, the centralized monitoring unit includes an intelligent monitoring terminal and a power supply unit, a communication unit, a current terminal block, and a voltage terminal block connected to the intelligent monitoring terminal. The current terminal block and the voltage terminal block are respectively connected to the grounding unit or direct grounding unit of the protector in each compartment, and are used to acquire the voltage and current data collected by each grounding unit and direct grounding unit. The intelligent monitoring terminal is used to analyze the operating status of the high-voltage cable and equipment based on the acquired voltage and current data. The power supply unit is used to supply power to the intelligent monitoring terminal, and the communication unit is used for the intelligent monitoring terminal to communicate with the remote monitoring master station.

[0014] Furthermore, the intelligent monitoring terminal includes an analog signal acquisition unit, a signal processing and storage unit, a central processing unit, and a display unit. The analog signal acquisition unit is used to acquire voltage and current data. The signal processing and storage unit is used to preprocess and pre-calculate the acquired current and voltage data. The central processing unit is used to further calculate and process the preprocessed and pre-calculated data to analyze the operating status of the high-voltage cable and equipment. The display unit is used to display the operating status information of the high-voltage cable and equipment.

[0015] Preferably, each of the compartments is equipped with a drawer, and the protector grounding unit or direct grounding unit is installed in the corresponding drawer.

[0016] Optionally, each of the compartments is provided with a hatch on its outer side.

[0017] Furthermore, each of the hatches is equipped with a fault indicator light, which is connected to a centralized monitoring unit. When a fault is detected in a certain protector grounding unit or direct grounding unit, the centralized monitoring unit controls the corresponding hatch to light up red.

[0018] Compared with existing technologies, the advantages of this invention are as follows: This invention designs multiple independent compartments within the enclosure, flexibly configuring multiple different types of grounding units according to the number of high-voltage cables to achieve reliable grounding protection for the metal sheaths and armor layers of multiple high-voltage cables; the grounding design for the metal sheaths and armor layers of each high-voltage cable is within an independent compartment, avoiding signal crosstalk between grounding units; each grounding unit is independently modularly designed, so when a grounding unit fails, only the grounding unit in the corresponding compartment needs to be repaired, without affecting the normal operation of other grounding units. This not only improves the operation and maintenance efficiency of the high-voltage cable grounding box, but also facilitates centralized maintenance of the grounding box, reducing investment costs. Furthermore, the unified centralized grounding within the grounding box at a single point solves the problem of multiple grounding point faults caused by decentralized on-site installations. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the external structure of a modular grounding box for centralized grounding of multiple high-voltage cables according to the present invention;

[0021] Figure 2This is a schematic diagram of the internal structure of the protector grounding unit in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the internal structure of the direct grounding unit in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the internal structure of the centralized monitoring unit in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the internal structure of a modular grounding box for centralized grounding of multiple high-voltage cables according to the present invention;

[0025] In the diagram: 1. Housing; 2. Compartment; 3. Protector grounding unit; 4. Direct grounding unit; 5. Centralized grounding unit; 6. Centralized monitoring unit; 7. Protector; 8. First current sensor; 9. Voltage sensor; 10. First current acquisition terminal block; 11. Voltage acquisition terminal block; 12. High-voltage cable copper shielding layer grounding wire; 13. High-voltage cable armor layer grounding wire; 14. Second current sensor; 15. Second current acquisition terminal block; 16. Intelligent monitoring terminal; 17. Power supply unit; 18. Communication unit; 19. Current wiring terminal block; 20. Voltage wiring terminal block; 21. Remote monitoring master station. Detailed Implementation

[0026] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] Reference Figures 1 to 5 This invention provides a modular grounding box for centralized grounding of multiple high-voltage cables, comprising a box body 1, wherein the box body 1 has multiple independent compartments 2, each compartment 2 is equipped with a protector grounding unit 3 or a direct grounding unit 4, and each protector grounding unit 3 or direct grounding unit 4 is connected to the grounding wire of the copper shielding layer and armor layer of the corresponding high-voltage cable; the box body 1 also has a centralized grounding unit 5 and a centralized monitoring unit 6, the centralized grounding unit 5 extends into each compartment 2, and is used for grounding each protector grounding unit 3 and direct grounding unit 4; the centralized monitoring unit 6 is connected to each protector grounding unit 3 and direct grounding unit 4, and is used to acquire voltage and current data collected by each protector grounding unit 3 and direct grounding unit 4, and analyze the operating status of the high-voltage cable and equipment based on the acquired data.

[0028] In this embodiment, the outer shell of the housing 1 is made of 304 stainless steel through die casting, with a protection level of IP54, and has good heat resistance, pressure resistance and wear resistance.

[0029] Specifically, such as Figure 2 As shown, the protector grounding unit 3 includes two protectors 7 (connected to the high-voltage cable copper shielding layer grounding wire 12 and the high-voltage cable armoring layer grounding wire 13 respectively), two first current sensors 8 (connected to the high-voltage cable copper shielding layer grounding wire 12 and the high-voltage cable armoring layer grounding wire 13 respectively), two voltage sensors 9 (connected in parallel to the two protectors 7), a first current acquisition terminal block 10 (connected to the two first current sensors 8), and a voltage acquisition terminal block 11 (connected to the two voltage sensors 9). The first current sensors 8 are connected in series with the protectors 7, and the voltage sensors 9 are connected in parallel with the protectors 7. One end of the protector 7 is connected to the centralized grounding unit 5, and the other end is connected to the high-voltage cable copper shielding layer grounding wire 12 or the high-voltage cable armoring layer grounding wire 13. One end of the first current acquisition terminal block 10 is connected to the first current sensor 8, and the other end is connected to the centralized monitoring unit 6. One end of the voltage acquisition terminal block 11 is connected to the voltage sensor 9, and the other end is connected to the centralized monitoring unit 6.

[0030] Specifically, such as Figure 3 As shown, the direct grounding unit 4 includes a second current sensor 14 (two sensors are provided, respectively connected to the high-voltage cable copper shielding layer grounding wire 12 and the high-voltage cable armor layer grounding wire 13) and a second current acquisition terminal block 15. The second current sensor 14 is installed on the high-voltage cable copper shielding layer grounding wire 12 or the high-voltage cable armor layer grounding wire 13, and the high-voltage cable copper shielding layer grounding wire 12 or the high-voltage cable armor layer grounding wire 13 is directly connected to the centralized grounding unit 5; one end of the second current acquisition terminal block 15 is connected to the second current sensor 14, and the other end is connected to the centralized monitoring unit 6.

[0031] In this embodiment, the protector 7 is a device for overvoltage protection of the metal sheath and armor layer of the high-voltage cable. It uses a ZnO varistor (or ZnO varistor) as the protective element, with no series gap, providing excellent protection characteristics and a superior voltage-current characteristic curve. It also boasts advantages such as good electrical insulation, high dielectric strength, resistance to tracking, resistance to electrolytic corrosion, heat resistance, cold resistance, aging resistance, explosion-proof properties, good chemical stability, hydrophobicity, and sealing performance. Under normal circumstances, the current flowing through the protector 7 is very small (microamperes). When an overvoltage occurs in the metal sheath or armor layer of the high-voltage cable, the resistance of the protector 7 decreases, the current increases, releasing the charge from the metal sheath or armor layer and protecting the cable for normal and safe operation.

[0032] In this embodiment, the first current sensor 8 is a zero-flux micro-current sensor with a monitoring range of 0.02mA to 2mA and an acquisition accuracy of 2% ± 5uA. The high-voltage cable copper shielding layer grounding wire 12 or the high-voltage cable armor layer grounding wire 13 passes through the current sensor, and its main function is to acquire the current signal of the high-voltage cable copper shielding layer grounding wire 12 or the high-voltage cable armor layer grounding wire 13 in real time.

[0033] In this embodiment, voltage sensor 9 uses the ceramic capacitor voltage divider principle to convert a 10kV voltage signal into a low-voltage 6.5V signal. The transformation ratio is (10kV / √3) / 6.5V, accuracy class: 3P, partial discharge: ≤20(1.2Um / √3)pC. The upper end of voltage sensor 9 is connected to the grounding wire 12 of the high-voltage cable copper shield layer or the grounding wire 13 of the high-voltage cable armor layer, and the lower end of voltage sensor 9 is connected to the centralized grounding unit 5. Its main function is to collect the voltage signals from the grounding wire 12 of the high-voltage cable copper shield layer and the grounding wire 13 of the high-voltage cable armor layer.

[0034] In this embodiment, the second current sensor 14 is based on the Rogowski coil principle, with a snap-fit ​​structure design, a sampling bandwidth of 0.1 Hz to 1 kHz, a signal input range of 0 A to 1000 A (peak-to-peak), and a signal output range of 3 to 5 V. Its accuracy is 0.5%. The second current sensor 14 is installed on the grounding wire 12 of the copper shield layer of the high-voltage cable or the grounding wire 13 of the armor layer of the high-voltage cable to acquire its power frequency current signal in real time.

[0035] In this embodiment, the grounding wire 12 of the high-voltage cable copper shield layer is made of soft copper wire, which has good conductivity. Its main functions are to eliminate electromagnetic interference, protect the cable from external damage, and ensure the safe operation of the equipment. The grounding wire 13 of the high-voltage cable armor layer is made of soft copper wire, which also has good conductivity. Its main functions are to ensure personal safety, prevent the cable from being damaged or deformed by external forces, and avoid electromagnetic interference.

[0036] In this embodiment, the centralized grounding unit 5 is composed of a grounding copper busbar and a galvanized copper column. The grounding copper busbar runs through each grounding unit, and each grounding unit is connected to the grounding copper busbar through the galvanized copper column, so as to realize the reliable grounding of each grounding unit.

[0037] Specifically, such as Figure 4As shown, the centralized monitoring unit 6 includes an intelligent monitoring terminal 16 and a power supply unit 17, a communication unit 18, a current terminal block 19, and a voltage terminal block 20 connected to the intelligent monitoring terminal 16. The current terminal block 19 and the voltage terminal block 20 are respectively connected to the protector grounding unit 3 or the direct grounding unit 4 in each compartment 2, and are used to acquire the voltage and current data collected by each protector grounding unit 3 and the direct grounding unit 4. The intelligent monitoring terminal 16 is used to analyze the operating status of the high-voltage cable and equipment based on the acquired voltage and current data. The power supply unit 17 is used to supply power to the intelligent monitoring terminal 16, and the communication unit 18 is used for the intelligent monitoring terminal 16 to communicate with the remote monitoring master station 21.

[0038] Furthermore, the intelligent monitoring terminal 16 includes an analog signal acquisition unit, a signal processing and storage unit, a central processing unit, and a display unit. The analog signal acquisition unit is used to acquire voltage and current data. The signal processing and storage unit is used to preprocess and pre-calculate the acquired current and voltage data. The central processing unit is used to further calculate and process the preprocessed and pre-calculated data to analyze the operating status of the high-voltage cable and equipment. The display unit is used to display the operating status information of the high-voltage cable and equipment.

[0039] In this embodiment, the power supply unit 17 is connected to an external AC220V mains power supply, which is converted into DC24V power to provide power to the intelligent monitoring terminal 16.

[0040] In this embodiment, the communication unit 18 is connected to the intelligent monitoring terminal 16 via an RS232 serial port, and can transmit data to the remote master station system via an optical port (corresponding to an optical cable), a network port (corresponding to a network cable), or wireless communication (corresponding to a wireless communication network card).

[0041] Preferably, each of the compartments 2 is equipped with a drawer, and the protector grounding unit 3 or direct grounding unit 4 is installed in the corresponding drawer. When a grounding unit needs to be repaired, only the drawer corresponding to that grounding unit can be pulled out without affecting the grounding units in other compartments 2.

[0042] Optionally, each of the compartments 2 is provided with a door on its outer side to facilitate the protection of the grounding unit inside each compartment 2.

[0043] Furthermore, each of the aforementioned hatches is equipped with a fault indicator light, which is connected to the centralized monitoring unit 6. When a fault is detected in a certain protector grounding unit 3 or direct grounding unit 4, the centralized monitoring unit 6 controls the corresponding hatch to light up red, thereby quickly locating the grounding unit that needs to be repaired and improving the efficiency of fault handling.

[0044] like Figure 5 As shown in this embodiment, the modular grounding box for centralized grounding of high-voltage cables can simultaneously connect to the copper shielding layer grounding wires and armoring layer grounding wires of six high-voltage cables. One end of each of the six high-voltage cables' copper shielding layer grounding wires and armoring layer grounding wires can be grounded through the protector 7, while the other end is directly grounded. This enables overvoltage and overcurrent monitoring of the copper shielding layer grounding wires and armoring layer grounding wires of the six high-voltage cables, as well as the status monitoring of the protector 7. In practical applications with more than six cables, the height of the box 1 can be increased by extending it from the bottom or the width of the box 1 can be increased by extending it from the sides. By adding grounding units, monitoring of the copper shielding layer grounding wires and armoring layer grounding wires of more than six cables can be achieved. In practical applications with fewer than six cables, grounding units can be reserved for future expansion.

[0045] In this embodiment, the monitoring method for monitoring the operating status of high-voltage cables and protectors through an intelligent monitoring terminal includes the following steps:

[0046] S1, collects current and voltage data of the grounding unit of the protector;

[0047] S2, Calculate the resistive current value Ir of the grounding unit of the protector based on the phase relationship between the current data and the voltage data;

[0048] S3, determine whether the resistive current value Ir exceeds the first current threshold I1. If yes, proceed to step S4; otherwise, return to step S1.

[0049] S4. Determine whether the duration T of the resistive current value Ir exceeding the first current threshold I1 exceeds the set duration (in this embodiment, the set duration is 0.1s, and the specific duration can be flexibly set according to the actual situation). If it exceeds the set duration, it is determined that the protector is faulty and proceeds to step S5; otherwise, proceeds to step S7.

[0050] S5, determine whether the resistive current value Ir is less than the second current threshold I2. If yes, determine that the grounding unit of the protector has a Class III fault; otherwise, proceed to step S6.

[0051] S6, determine whether the resistive current value Ir is less than the third current threshold I3. If so, determine that the grounding unit of the protector has a Class II fault; otherwise, determine that the grounding unit of the protector has a Class I fault.

[0052] S7, determined as transient breakdown of the protector, update the transient breakdown count of the protector n=n+1;

[0053] S8. Determine whether the number of transient breakdowns n of the protector exceeds the set number (in this embodiment, the set number is 10,000 times, and the specific number can be flexibly set according to the actual situation). If it exceeds the set number, it is determined that the grounding unit of the protector has a Class I fault; otherwise, return to step S1.

[0054] In this embodiment, when a Class I fault is detected in the grounding unit of the protector, the protector needs to be replaced; when a Class II fault is detected in the grounding unit of the protector, routine tests need to be performed on the protector, and the results should be processed accordingly; when a Class III fault is detected in the grounding unit of the protector, the changes in the resistive current value need to be monitored and analyzed.

[0055] Specifically, the monitoring method further includes collecting current data of the directly grounded unit (this step is performed synchronously with the aforementioned step S1), and determining whether the current value of the directly grounded unit exceeds a set threshold (in this embodiment, the set threshold is 50A, and the specific threshold can be flexibly set according to the actual situation). If it exceeds the threshold, a grounding loop current alarm is triggered, and the cable needs to be de-energized for maintenance; otherwise, the current data of the directly grounded unit continues to be collected.

[0056] Specifically, in step S2, the current sensor collects the total current, which includes a capacitive current component (accounting for 80%–90% of the total current) and a resistive current component (accounting for 10%–20% of the total current). The capacitive current phase leads the voltage phase by 90°, and the resistive current phase is the same as the voltage phase. The resistive current component reflects the protector's status; therefore, it needs to be extracted from the total current to determine the protector's status. The formula for calculating the resistive current value is: I represents the total current phasor value, and φ represents the initial voltage phase angle.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A modular grounding box for centralized grounding of multiple high-voltage cables, characterized in that, The enclosure includes a housing (1), which contains multiple independent compartments (2). Some compartments (2) contain protector grounding units (3), and others contain direct grounding units (4). Each protector grounding unit (3) or direct grounding unit (4) is connected to the grounding wire of the copper shielding layer and armor layer of the corresponding high-voltage cable. The housing (1) also contains a centralized grounding unit (5) and a centralized monitoring unit (6). The centralized grounding unit (5) extends into each compartment (2) and is used for grounding each protector grounding unit (3) and direct grounding unit (4). The centralized monitoring unit (6) is connected to each protector grounding unit (3) and direct grounding unit (4) and is used to acquire voltage and current data collected by each protector grounding unit (3) and direct grounding unit (4) and analyze the operating status of the high-voltage cable and equipment based on the acquired data. The protector grounding unit (3) includes a protector (7), a first current sensor (8), a voltage sensor (9), a first current acquisition terminal block (10), and a voltage acquisition terminal block (11). The first current sensor (8) is connected in series with the protector (7), and the voltage sensor (9) is connected in parallel with the protector (7). One end of the protector (7) is connected to the centralized grounding unit (5), and the other end is connected to the high-voltage cable copper shielding layer grounding wire (12) or the high-voltage cable armor layer grounding wire (13). One end of the first current acquisition terminal block (10) is connected to the first current sensor (8), and the other end is connected to the centralized monitoring unit (6). One end of the voltage acquisition terminal block (11) is connected to the voltage sensor (9), and the other end is connected to the centralized monitoring unit (6). The direct grounding unit (4) includes a second current sensor (14) and a second current acquisition terminal block (15). The second current sensor (14) is installed on the high-voltage cable copper shielding layer grounding wire (12) or the high-voltage cable armor layer grounding wire (13), and the high-voltage cable copper shielding layer grounding wire (12) or the high-voltage cable armor layer grounding wire (13) is directly connected to the centralized grounding unit (5). One end of the second current acquisition terminal block (15) is connected to the second current sensor (14), and the other end is connected to the centralized monitoring unit (6).

2. A modular grounding box for centralized grounding of multiple high-voltage cables as described in claim 1, characterized in that, The centralized monitoring unit (6) includes an intelligent monitoring terminal (16) and a power supply unit (17), a communication unit (18), a current terminal block (19), and a voltage terminal block (20) connected to the intelligent monitoring terminal (16). The current terminal block (19) and the voltage terminal block (20) are respectively connected to the protector grounding unit (3) or the direct grounding unit (4) in each compartment (2) to acquire the voltage and current data collected by each protector grounding unit (3) and the direct grounding unit (4). The intelligent monitoring terminal (16) is used to analyze the operating status of the high-voltage cable and equipment based on the acquired voltage and current data. The power supply unit (17) is used to supply power to the intelligent monitoring terminal (16). The communication unit (18) is used for the intelligent monitoring terminal (16) to communicate with the remote monitoring master station (21).

3. A modular grounding box for centralized grounding of multiple high-voltage cables as described in claim 2, characterized in that, The intelligent monitoring terminal (16) includes an analog quantity acquisition unit, a signal processing and storage unit, a central processing unit, and a display unit. The analog quantity acquisition unit is used to acquire voltage data and current data. The signal processing and storage unit is used to preprocess and pre-calculate the acquired current data and voltage data. The central processing unit is used to further calculate and process the preprocessed and pre-calculated data to analyze the operating status of the high-voltage cable and equipment. The display unit is used to display the operating status information of the high-voltage cable and equipment.

4. A modular grounding box for centralized grounding of multiple high-voltage cables as described in claim 1, characterized in that, Each of the compartments (2) is equipped with a drawer, and the protector grounding unit (3) or direct grounding unit (4) is installed in the corresponding drawer.

5. A modular grounding box for centralized grounding of multiple high-voltage cables as described in claim 1, characterized in that, Each of the compartments (2) is provided with a hatch on its outer side.

6. A modular grounding box for centralized grounding of multiple high-voltage cables as described in claim 5, characterized in that, Each of the aforementioned hatches is equipped with a fault indicator light, which is connected to the centralized monitoring unit (6). When a fault is detected in a certain protector grounding unit (3) or direct grounding unit (4), the centralized monitoring unit (6) controls the corresponding hatch to light up red.

Images