Modularized grounding box for centralized grounding of multiple paths of high-voltage cables

Abstract

The invention provides a modularized grounding box for centralized grounding of multiple paths of high-voltage cables, which comprises a box body, a plurality of independent compartments are arranged in the box body, and a protector grounding unit or a direct grounding unit is arranged in each compartment. Each protector grounding unit or direct grounding unit is connected with a copper shielding layer and a grounding wire of an armor layer of the corresponding high-voltage cable; a centralized grounding unit and a centralized monitoring unit are also arranged in the box body; the centralized grounding unit is used for grounding each protector grounding unit and each direct grounding unit; the centralized monitoring unit is used for analyzing the operation state of the high-voltage cable and equipment. According to the high-voltage cable grounding box, a plurality of independent compartments are designed in the box body, so that mutual crosstalk of signals among grounding units is avoided, the overhaul efficiency of the high-voltage cable grounding box is improved, centralized maintenance of the grounding box is facilitated, and the investment cost is reduced; and meanwhile, one-point grounding is uniformly concentrated in the grounding box, so that the problem of fault hidden dangers of a plurality of grounding points formed by in-situ multi-point distributed installation is solved.

Description

Technical Field

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

[0002] In the power grid and railway power supply system, when lightning waves, internal overvoltage or system short circuit fault occurs, the metal sheath and armor layer of the high-voltage cable will generate overvoltage or overcurrent. Therefore, the high-voltage cable adopts direct grounding of one end of the metal sheath and armor layer, and the other end is grounded through the protector. The overvoltage induced on the metal sheath and armor layer is absorbed by the protector at the grounding end of the protector to avoid long-term overvoltage breakdown and short circuit fault of the cable. The overcurrent induced on the metal sheath and armor layer flows into the earth through the direct grounding end to avoid long-term overcurrent and burning of the cable, so as to realize the induced overvoltage and overcurrent protection of the high-voltage cable. Therefore, the high-voltage cable grounding box is divided into a direct grounding box and a protector grounding box.

[0003] Usually, there are more than a dozen or even dozens of high-voltage cables in a substation or transformer substation. At present, each cable is equipped with a separate grounding box and installed locally, usually in the cable room of the high-voltage switch cabinet or on the wall bracket of the cable sandwich. This traditional grounding box installation method has the following main defects:

[0004] 1) There are many and scattered grounding points, which makes cable operation and maintenance difficult, time-consuming and labor-intensive;

[0005] 2) Installation in high-voltage switch cabinets requires power outages during cable operation and maintenance, which seriously affects the reliability of power supply;

[0006] 3) The on-site multi-point dispersed installation method creates multiple grounding points with potential fault risks, which increases the probability of failure.

[0007] Therefore, it is urgent to invent a modular grounding box with centralized grounding to solve the above problems. Summary of the invention

[0008] The present invention proposes a modular grounding box for centralized grounding of multiple high-voltage cables, which solves the problems of difficult cable operation and maintenance, low power supply reliability, and high probability of grounding point failure in the prior art grounding box adopting a multi-point dispersed installation method.

[0009] The technical solution of the present invention is achieved in this way:

[0010] The present invention provides a modular grounding box for centralized grounding of multiple high-voltage cables, including a box body. A plurality of independent compartments are provided inside the box body. Each compartment is provided with a protector grounding unit or a direct grounding unit. Each protector grounding unit or direct grounding unit is connected to the grounding wires of the copper shielding layer and the armor layer of the corresponding high-voltage cable. A centralized grounding unit and a centralized monitoring unit are also provided inside the box body. The centralized grounding unit extends into each compartment 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, and is used to obtain the voltage data and current data collected by each protector grounding unit and direct grounding unit, and analyze the operating status of the high-voltage cable and equipment according to the obtained data analysis.

[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, 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 shielding 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 shielding 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 shielding 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 connection terminal block, and a voltage connection terminal block connected to the intelligent monitoring terminal. The current connection terminal block and the voltage connection terminal block are respectively connected to the protector grounding unit or the direct grounding unit in each compartment for obtaining the voltage data and current data collected by each protector grounding unit and direct grounding unit. The intelligent monitoring terminal is used to analyze the operating status of the high-voltage cable and equipment according to the obtained voltage data and current data analysis. The power supply unit is used to supply power to the intelligent monitoring terminal, and the communication unit is used for communication connection between the intelligent monitoring terminal and the remote monitoring master station.

[0014] Further, the intelligent monitoring terminal 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, and 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, a drawer is installed in each compartment, and the protector grounding unit or the direct grounding unit is installed in the corresponding drawer.

[0016] Optionally, a cabin door is provided on the outer side of each compartment.

[0017] Further, a fault indicator light is provided on each cabin door. The fault indicator light is connected to the centralized monitoring unit. When a fault occurs in a certain protector grounding unit or direct grounding unit, the centralized monitoring unit controls the fault indicator light on the corresponding cabin door to turn on a red light.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: By designing multiple independent compartments in the box body, the present invention flexibly configures multiple different types of grounding units according to the number of high-voltage cables to achieve reliable grounding protection for the metal sheaths and armoring layers of multiple high-voltage cables; the grounding design of the metal sheath and armoring layer of each high-voltage cable is in an independent compartment, avoiding signal crosstalk between grounding units; each grounding unit is independently modularized. When a certain grounding unit fails, only the grounding unit in the corresponding compartment needs to be repaired, which will not affect 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, reduces investment costs. At the same time, unified centralized grounding at one point in the grounding box solves the problem of potential faults at multiple grounding points formed by in-situ multi-point decentralized installation. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

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

[0021] Figure 2Schematic diagram of the internal structure of the protector grounding unit in the embodiment of the present invention;

[0022] Figure 3 Schematic diagram of the internal structure of the direct grounding unit in the embodiment of the present invention;

[0023] Figure 4 Schematic diagram of the internal structure of the centralized monitoring unit in the embodiment of the present invention;

[0024] Figure 5 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 figure: 1. Box body; 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. Copper shield layer grounding wire of high-voltage cable; 13. Armor layer grounding wire of high-voltage cable; 14. Second current sensor; 15. Second current acquisition terminal block; 16. Intelligent monitoring terminal; 17. Power supply unit; 18. Communication unit; 19. Current connection terminal block; 20. Voltage connection terminal block; 21. Remote monitoring master station. Specific embodiments

[0026] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] Refer to Figures 1 to 5 , the present invention provides a modular grounding box for centralized grounding of multiple high-voltage cables, including a box body 1. A plurality of independent compartments 2 are arranged in the box body 1. Each compartment 2 is provided with a protector grounding unit 3 or a direct grounding unit 4. Each protector grounding unit 3 or direct grounding unit 4 is connected to the grounding wires of the copper shield layer and the armor layer of the corresponding high-voltage cable. A centralized grounding unit 5 and a centralized monitoring unit 6 are further arranged in the box body 1. The centralized grounding unit 5 extends into each compartment 2 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 for obtaining the voltage data and current data collected by each protector grounding unit 3 and direct grounding unit 4, and analyzing the operating state of the high-voltage cable and equipment according to the obtained data.

[0028] In this embodiment, the housing 1 of the box body is integrally die-cast from 304 stainless steel, with an IP54 protection level, and has good heat resistance, pressure resistance and wear resistance.

[0029] Specifically, as Figure 2 shown, the protector grounding unit 3 includes protectors 7 (two are provided, respectively connected to the grounding wires 12 of the copper shield layer of the high-voltage cable and the grounding wires 13 of the armor layer of the high-voltage cable), first current sensors 8 (two are provided, respectively connected to the grounding wires 12 of the copper shield layer of the high-voltage cable and the grounding wires 13 of the armor layer of the high-voltage cable), voltage sensors 9 (two are provided, respectively connected in parallel at both ends of 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 sensor 8 is connected in series with the protector 7, 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 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; 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, as Figure 3 shown, the direct grounding unit 4 includes second current sensors 14 (two are provided, respectively connected to the grounding wires 12 of the copper shield layer of the high-voltage cable and the grounding wires 13 of the armor layer of the high-voltage cable) and a second current acquisition terminal block 15. 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, and 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 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 realizing overvoltage protection of the metal sheath and armor layer of the high-voltage cable. ZnO varistors (or ZnO varistor discs) are used as protection elements, without series gaps, with good protection characteristics, excellent voltage-current characteristic curves, and also having good electrical insulation performance, high dielectric strength, anti-tracking, anti-electro-erosion, heat resistance, cold resistance, aging resistance, explosion protection and good chemical stability, hydrophobicity, sealing performance, etc. Under normal circumstances, the current flowing through the protector 7 is very small (in the microampere level); when overvoltage appears in the metal sheath or armor layer of the high-voltage cable, the resistance of the protector 7 becomes smaller, the current increases, and the charge of the metal sheath or armor layer is released to protect the normal and safe operation of the cable.

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

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

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

[0035] In this embodiment, the grounding wire 12 of the copper shielding layer of the high-voltage cable is made of soft copper wire with good electrical 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 armor layer of the high-voltage cable is made of soft copper wire with good electrical conductivity. Its main functions are to ensure personal safety, prevent the cable from being damaged, extruded and deformed by the outside world, and avoid electromagnetic interference.

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

[0037] Specifically, as Figure 4As shown in the figure, the centralized monitoring unit 6 includes an intelligent monitoring terminal 16, 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 obtain the voltage data and current data collected by each protector grounding unit 3 and 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 obtained voltage data 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 to establish a communication connection between the intelligent monitoring terminal 16 and the remote monitoring master station 21.

[0038] Further, 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.

[0039] In this embodiment, the power supply unit 17 is externally connected to AC220V mains power and is converted into a DC24V power supply to provide a power supply for the intelligent monitoring terminal 16.

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

[0041] Preferably, a drawer is installed in each compartment 2, and the protector grounding unit 3 or the direct grounding unit 4 is installed in the corresponding drawer. When it is necessary to repair a certain grounding unit, only the drawer corresponding to the grounding unit can be pulled out, without affecting the grounding units in other compartments 2.

[0042] Optionally, a cabin door is provided on the outside of each compartment 2 to facilitate the protection of the grounding units in each compartment 2.

[0043] Further, a fault indicator light is provided on each cabin door. The fault indicator light is connected to the centralized monitoring unit 6. When it is detected that a certain protector grounding unit 3 or direct grounding unit 4 fails, the centralized monitoring unit 6 controls the fault indicator light on the corresponding cabin door to turn on a red light, so as to quickly locate the grounding unit that needs to be repaired and improve the fault handling efficiency.

[0044] As Figure 5 shown, in this embodiment, the modular grounding box for centralized grounding of high-voltage cables can connect the copper shielding layer grounding wires and armor layer grounding wires of 6 high-voltage cables at the same time. One end of the copper shielding layer grounding wires and armor layer grounding wires of 6 high-voltage cables can be grounded through the protector 7, and the other end is directly grounded. Thus, overvoltage, overcurrent, and the status monitoring of the protector 7 for the copper shielding layer grounding wires and armor layer grounding wires of 6 high-voltage cables are realized. In actual application scenarios, if there are more than 6 cables, the height of the box body 1 can be increased by bottom expansion or the width of the box body 1 can be increased by side expansion, and the monitoring of the copper shielding layer grounding wires and armor layer grounding wires of more than 6 cables can be realized by adding grounding units. In actual application scenarios with less than 6 cables, grounding units can be reserved for subsequent capacity expansion.

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

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

[0047] S2, calculating the resistive current value Ir of the protector grounding unit according to the phase relationship between the current data and the voltage data;

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

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

[0050] S5, judging whether the resistive current value Ir is less than the second current threshold I2. If so, it is determined that a type III fault occurs in the protector grounding unit; otherwise, go to step S6;

[0051] S6, judging whether the resistive current value Ir is less than the third current threshold I3. If so, it is determined that a type II fault occurs in the protector grounding unit; otherwise, it is determined that a type I fault occurs in the protector grounding unit;

[0052] S7, determining that the protector has an instantaneous breakdown, and updating the number of instantaneous breakdowns of the protector n = n + 1;

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

[0054] In this embodiment, when it is determined that a Class I fault occurs in the protector grounding unit, the protector needs to be replaced; when it is determined that a Class II fault occurs in the protector grounding unit, routine tests need to be carried out on the protector and the treatment is carried out according to the test results; when it is determined that a Class III fault occurs in the protector grounding unit, attention needs to be paid to tracking and analyzing the change of the resistive current value.

[0055] Specifically, the monitoring method further includes collecting the current data of the direct grounding unit (this step is carried out synchronously with the foregoing step S1), and determining whether the current value of the direct grounding unit exceeds the set threshold (the set threshold in this embodiment is 50 A, and the specific threshold can be flexibly set according to the actual situation). If it exceeds, a grounding loop alarm is responded, and power outage maintenance needs to be carried out on the cable, otherwise, the current data of the direct grounding unit is continuously 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 component) and a resistive current component (accounting for 10% - 20% of the total current component). 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 can reflect the state of the protector. Therefore, it is necessary to extract the resistive current from the total current to judge the state of the protector. Among them, the calculation formula of the resistive current value is: I represents the total current phasor value, and φ represents the initial included angle of the voltage phase.

[0057] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A modular grounding box for centralized grounding of multiple high-voltage cables, characterized in that, It includes a box body (1), and a plurality of independent compartments (2) are arranged inside the box body (1). A protector grounding unit (3) or a direct grounding unit (4) is arranged in each compartment (2). Each protector grounding unit (3) or direct grounding unit (4) is connected to the grounding wires of the copper shielding layer and the armor layer of the corresponding high-voltage cable. A centralized grounding unit (5) and a centralized monitoring unit (6) are also arranged inside the box body (1). The centralized grounding unit (5) extends into each compartment (2) 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) for obtaining the voltage data and current data collected by each protector grounding unit (3) and direct grounding unit (4), and analyzing the operating state of the high-voltage cable and equipment according to the obtained data.

2. The modular grounding box for centralized grounding of multiple high-voltage cables according to claim 1, characterized in that, The protector grounding unit (3) includes a protector (7), a first current sensor (8), a voltage sensor (9), a first current collection terminal block (10) and a voltage collection terminal block (11). The first current sensor (8) is connected in series with the protector (7), 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 grounding wire of the copper shielding layer of the high-voltage cable (12) or the grounding wire of the armor layer of the high-voltage cable (13). One end of the first current collection 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 collection terminal block (11) is connected to the voltage sensor (9), and the other end is connected to the centralized monitoring unit (6).

3. The modular grounding box for centralized grounding of multiple high-voltage cables according to claim 1, characterized in that, The direct grounding unit (4) includes a second current sensor (14) and a second current collection terminal block (15). The second current sensor (14) is installed on the grounding wire of the copper shielding layer of the high-voltage cable (12) or the grounding wire of the armor layer of the high-voltage cable (13), and the grounding wire of the copper shielding layer of the high-voltage cable (12) or the grounding wire of the armor layer of the high-voltage cable (13) is directly connected to the centralized grounding unit (5). One end of the second current collection terminal block (15) is connected to the second current sensor (14), and the other end is connected to the centralized monitoring unit (6).

4. The modular grounding box for centralized grounding of multiple high-voltage cables according to 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) for obtaining the voltage data and current data collected by each protector grounding unit (3) and direct grounding unit (4). The intelligent monitoring terminal (16) is used for analyzing the operating state of the high-voltage cable and equipment according to the obtained voltage data and current data; the power supply unit (17) is used for supplying power to the intelligent monitoring terminal (16), and the communication unit (18) is used for the communication connection between the intelligent monitoring terminal (16) and the remote monitoring master station (21).

5. The modular grounding box for centralized grounding of multiple high-voltage cables according to claim 4, 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 for acquiring voltage data and current data. The signal processing and storage unit is used for preprocessing and pre-operating the acquired current data and voltage data. The central processing unit is used for further operating and processing the preprocessed and pre-operated data to analyze the operating state of the high-voltage cable and equipment. The display unit is used for displaying the operating state information of the high-voltage cable and equipment.

6. The modular grounding box for centralized grounding of multiple high-voltage cables according to claim 1, characterized in that, A drawer is installed in each compartment (2), and the protector grounding unit (3) or the direct grounding unit (4) is installed in the corresponding drawer.

7. The modular grounding box for centralized grounding of multiple high-voltage cables according to claim 1, characterized in that, A cabin door is provided on the outside of each compartment (2).

8. The modular grounding box for centralized grounding of multiple high-voltage cables according to claim 7, characterized in that, A fault indicator light is provided on each cabin door. The fault indicator light is connected to the centralized monitoring unit (6). When a fault occurs in a certain protector grounding unit (3) or direct grounding unit (4) is detected, the centralized monitoring unit (6) controls the fault indicator light on the corresponding cabin door to turn on a red light.

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