A non-intrusive secondary cabinet cable current and voltage monitoring device and its installation method

Abstract

This invention discloses a non-intrusive secondary cabinet cable current and voltage monitoring device and installation method, relating to the field of power system operation and maintenance monitoring technology. The device includes: a sensor unit, a collector unit, and a carrier unit; the sensor unit and the collector unit are mounted on the carrier unit; the sensor unit includes a sensor probe, a data acquisition board, and spring contacts; the sensor probe is connected to the data acquisition board; the collector unit includes a data collection board, a collector main control chip, and terminal blocks; the collector main control chip is connected to the data acquisition board via the data collection board and spring contacts; the terminal blocks are connected to the collector main control chip for information exchange, and the terminal blocks are responsible for powering the data collection board and the collector main control chip. This invention achieves automated, non-intrusive monitoring of secondary cabinet cables through a probe with an open-ring mutual inductance structure, improving the safety of secondary cabinet cable monitoring operations.

Description

Technical Field

[0001] This invention belongs to the field of power system operation and maintenance monitoring technology, specifically relating to a non-intrusive secondary cabinet cable current and voltage monitoring device and its installation method. Background Technology

[0002] In power systems, secondary switchgear cabinets serve as the core carriers of secondary equipment for protection, control, and measurement. The current and voltage status of their internal cables directly affect the correct operation of relay protection devices, the accurate data acquisition of measurement and control devices, and the safe and stable operation of the entire power grid. With the continuous expansion of the power grid, factors such as equipment aging, load fluctuations, and human error can all lead to abnormal operating conditions in secondary circuits, such as poor contact, decreased insulation, open circuits in current transformers, or short circuits in voltage transformers. If these hidden dangers are not detected and addressed in a timely manner, they may cause protection systems to fail to operate, malfunction, or even escalate into power grid accidents.

[0003] Currently, non-invasive monitoring of electrical parameters of cables in secondary power distribution cabinets mainly relies on two methods: First, during equipment power outages for maintenance, maintenance personnel use handheld instruments such as clamp meters and multimeters for periodic inspections. This method is discrete detection, has poor timeliness, cannot capture transient faults or intermittent anomalies, and frequent cabinet opening operations increase operational risks. Second, some secondary power distribution cabinets integrate sensors for collecting incoming current and voltage of secondary equipment. However, the internal space of the cabinet is limited, and the cable to be monitored is randomly arranged on the terminal block. Different sensor fixing schemes and engineering application methods need to be designed for different cable positions. This makes it difficult to move or add / remove sensors once they are fixed. Moreover, the sensors used are all closed-type current transformers, and their installation or modification requires disconnecting the original cables. This is not only a complex process that requires equipment power outages, but may also introduce new fault points due to disconnection operations, affecting power supply reliability. Summary of the Invention

[0004] The purpose of this invention is to provide a non-intrusive secondary cabinet cable current and voltage monitoring device and installation method. By using a collector unit in conjunction with a sensor probe with an open circular ring mutual inductance structure, the installation and disassembly of the monitoring device can be completed under the premise that the cable is working normally and the cabinet maintains its original layout, thereby achieving online acquisition of electrical data of the cable under test.

[0005] To achieve the above objectives, the present invention is implemented using the following technical solution.

[0006] On one hand, the present invention provides a non-intrusive secondary cabinet cable current and voltage monitoring device, comprising: a sensor unit, a collector unit, and a carrier unit; The sensor unit and the collector unit are disposed on the carrier unit; The sensor unit includes at least one sub-sensor; the sub-sensor includes a sensor probe, a data acquisition board, and a spring contact; the data acquisition board is electrically connected to the sensor probe; wherein, the sensor probe is an open-ring mutual inductance structure for adapting to the cable under test; The aggregator unit includes a data aggregator board, a aggregator main control chip, and wiring terminals; the data acquisition board is connected to the input terminal of the data aggregator board via the spring contact; the aggregator main control chip is connected to the output terminal of the data aggregator board and is used to receive data from each tested cable; the wiring terminals are electrically connected to the aggregator main control chip and the data aggregator board respectively; the aggregator main control chip interacts with the external cable monitoring system through the wiring terminals.

[0007] Optionally, the supporting unit includes a fixing plate, a lower housing, and an upper housing; the sensor unit is disposed in the upper housing; The lower housing is disposed on the fixing plate; a through groove for installing the collector unit is provided in the middle of the lower housing; fixing grooves for detachably connecting the sensor unit are provided on both sides of the top end face of the lower housing, for cooperating with the elastic contact connection between the sensor unit and the collector unit. The upper housing is mounted on the lower housing and is used for electrical protection of the sensor unit.

[0008] Optionally, the sub-sensor further includes a sensor unit housing disposed outside the sensor probe for electromagnetic shielding of the sensor probe.

[0009] Optionally, the data acquisition board is located on the bottom inner side of the sensor unit housing, and a square through hole is provided at the bottom of the sensor unit housing for connecting the data acquisition board to the spring contact.

[0010] Optionally, the sensor probe includes a magnetic core and an excitation coil; The magnetic core has a discontinuous structure and is used for opening and closing operations when installing the cable under test; the excitation coil is wound around the bottom of the magnetic core and the axis of the excitation coil is perpendicular to the axis of the magnetic core; the two ends of the excitation coil are respectively connected to the data acquisition board for acquiring data of the cable under test.

[0011] Optionally, the data aggregation board includes multiple data transmission copper-clad areas, and the spring contact includes a data transmission contact for adapting and connecting the data transmission copper-clad areas; the data aggregation board acquires the data of the cable under test output by the data acquisition board of each sub-sensor through the data transmission contact.

[0012] Optionally, the data aggregation board further includes a positively charged copper-plated area, a negatively charged copper-plated area, and a ground copper-plated area; The spring contact also includes a positive contact adapted to the positive copper-plated area, a negative contact adapted to the negative copper-plated area, and a ground contact adapted to the ground copper-plated area; the data acquisition board supplies power to the data acquisition board through the positive copper-plated area, the negative copper-plated area, and the ground copper-plated area via the positive contact, the negative contact, and the ground contact of the spring contact.

[0013] Optionally, the spring contact is welded to the bottom of the data acquisition board.

[0014] Optionally, the data acquisition boards of each sub-sensor are powered by parallel connection of the positively charged copper area, the negatively charged copper area, and the ground copper area of ​​the data aggregation board.

[0015] Secondly, the present invention provides a method for installing a non-intrusive secondary cabinet cable current and voltage monitoring device, comprising: The load-bearing unit is fixedly connected to the secondary screen cabinet body; The collector unit is positioned at the middle of the secondary cabinet and the terminal block corresponding to the bearing unit; After placing the cable under test in the inner core area of ​​the sensor probe using the sensor probe, the sensor unit is detachably connected to the carrier unit by tightening screws.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: This invention utilizes a sensor probe with an open-ring mutual inductance structure, enabling sensor installation and removal while the tested cable is operating normally. It provides non-invasive monitoring of the cable, ensuring cable monitoring safety. A data collector unit gathers data from one or more sub-sensors, ensuring adaptability to scenarios with varying numbers of cables under test. After data acquisition, the sensor unit interacts with an external cable monitoring system via the data collector unit. Both the sensor and data collector units are housed on a support unit, allowing for flexible adjustment of the sensor unit position based on the actual location of the tested cable. The sensor and data collector units are connected via spring contacts, enhancing the flexibility of sensor installation and removal. This invention enables monitoring device installation while the cable is energized and allows for flexible sensor unit placement based on the cable's location, ensuring overall layout regularity and electrical protection reliability. It achieves online monitoring of the tested cable, promptly detecting transient faults or intermittent anomalies.

[0017] This invention achieves non-intrusive monitoring of the tested cable through an open-ring mutual inductance structure composed of a magnetic core and an excitation coil, improving the safety of cable monitoring operations. The copper-plated area within the data aggregation board ensures a compact overall installation method, effectively utilizing the narrow space between the cabinet and terminal blocks, saving cabinet space and increasing the installation flexibility of the sensor unit. The through-slot and fixing slot design of the lower housing allows for flexible adjustment of the number of sub-sensors within the sensor unit, simplifying sub-sensor relocation and addition / removal operations. The fixing slot structure enables flexible selection of the sensor unit's fixed position. Furthermore, the invention provides electromagnetic shielding for the sensor probe through the sensor unit housing, improving the reliability of monitoring results. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of one embodiment of the non-intrusive secondary cabinet cable current and voltage monitoring device of the present invention; Figure 2 This is a schematic diagram of another embodiment of the non-intrusive secondary cabinet cable current and voltage monitoring device of the present invention; Figure 3 This is a partial connection cross-sectional diagram of the non-intrusive secondary cabinet cable current and voltage monitoring device of the present invention; Figure 4 This is a schematic cross-sectional view of the sensor unit's open annular mutual inductance structure when it is open. Figure 5 This is a schematic diagram of a collector unit structure according to the present invention; Figure 6 This is a schematic diagram of other collector unit structures of the present invention; Figure 7 This is a flowchart of an embodiment of the non-intrusive secondary cabinet cable current and voltage monitoring module installation method according to the present invention; Figure 8 This is an installation diagram of the non-intrusive secondary cabinet cable current and voltage monitoring module of the present invention. Figure 9 This is a side view of the sensor unit of the present invention without the sensor unit housing. The components include: 1. Sensor unit; 11. Sensor probe; 111. Magnetic core; 112. Excitation coil; 12. Data acquisition board; 13. Spring contact; 131. Positive contact; 132. Negative contact; 133. Ground contact; 134. Data transmission contact; 14. Locking screw; 15. Sensor unit housing; 2. Collector unit; 21. Data collection board; 211. Positive copper-plated area; 212. Negative copper-plated area; 213. Ground copper-plated area; 214. Data transmission copper-plated area; 215. First data transmission copper-plated area; 216. Second data transmission copper-plated area; 22. Collector main control chip; 23. Wiring terminal; 3. Bearing unit; 31. Fixing plate; 32. Lower housing; 321. Through slot; 322. Fixing slot; 33. Upper housing; 4. Cable under test; 5. Secondary cabinet; 6. Secondary cabinet terminal block. Detailed Implementation

[0019] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solution of the present invention, rather than limitations thereof. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.

[0020] The term "and / or" simply describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0021] Example 1

[0022] This embodiment describes a non-intrusive secondary cabinet cable current and voltage monitoring device, such as... Figure 1 , Figures 3-5 As shown, it specifically includes: sensor unit 1, collector unit 2 and carrier unit 3; sensor unit 1 and collector unit 2 are disposed on carrier unit 3; carrier unit is used to fix the monitoring device to the secondary cabinet, and the positions of collector unit and sensor unit can be flexibly adjusted according to the scene where the cable under test is located.

[0023] The sensor unit includes one or more sub-sensors; the number of sub-sensors is selected according to the number of cables under test; each sub-sensor includes a sensor probe 11, a data acquisition board 12, and a spring contact 13; the sensor probe 11 is configured with an open-loop mutual inductance structure adapted to the cable under test. The open-loop structure allows for non-invasive monitoring of the cable under test, and the opening allows installation to be completed under normal operating conditions of the cable, avoiding data loss and production losses due to power outages; the sensor probe 11 is electrically connected to the data acquisition board 12; the data acquisition board acquires the current and voltage data of the cable under test through the sensor probe. The spring contact 13 is preferably made of gold-plated copper, possessing extensibility and maintaining good conductivity under pressure.

[0024] The collector unit 2 includes a data collection board 21, a collector main control chip 22, and a terminal block 23. The input terminals of the data collection board 21 are connected to the data acquisition boards 12 of each sub-sensor through the spring contacts 13 of each sub-sensor. The data collection board has multiple copper-clad areas that cooperate with the spring contacts to realize the connection of the data collection board to each sub-sensor, which improves the adaptability to different numbers of cables under test.

[0025] The main control chip 22 of the collector is connected to the output end of the data collection board 21 and is used to receive data from each cable under test; the terminal block 23 is electrically connected to the main control chip 22 of the collector and the data collection board 21 respectively and is used to supply power to the main control chip of the collector and the data collection board respectively; the main control chip 22 of the collector interacts with the external cable monitoring system through the terminal block 23.

[0026] In this embodiment, a sensor probe with an open circular ring mutual inductance structure is used to achieve non-invasive monitoring of the cable under test. The sensor can be installed and removed while the cable under test is working normally, ensuring the safety of cable monitoring. After the sensor unit collects data, it interacts with the external cable monitoring system through the aggregator unit. Both the sensor unit and the aggregator unit are located on the carrier unit, so the position of the sensor unit can be flexibly adjusted according to the actual position of the cable under test.

[0027] Example 2

[0028] Based on the same inventive concept as Embodiment 1, this embodiment introduces a non-intrusive secondary cabinet cable current and voltage monitoring device, including a sensor unit 1, a collector unit 2 and a carrier unit 3.

[0029] like Figure 3 , Figure 4As shown, the sensor unit 1 includes a sensor probe 11, a data acquisition board 12, a spring contact 13, a locking screw 14, and a sensor unit housing 15. The sensor probe 11 is an open-ring mutual inductance structure through which the cable under test 4 can pass, consisting of a magnetic core 111 and an excitation coil 112. The inner side of the ring is the through-hole area of ​​the cable under test 4, and the magnetic core 111 is surrounded on the outer side of the ring. The magnetic core 111 is a discontinuous structure that can be separated or fastened as the sensor probe 11 is opened and closed. When fastened, the cross-section of the magnetic core 111 is tightly connected. The excitation coil 112 is a closed loop structure made of copper wire, which is fastened to the magnetic core 111. The excitation coil is wound around the bottom of the magnetic core, and the axis of the magnetic core 111 is perpendicular to the axis of the excitation coil 112. The two ends of the excitation coil 112 are soldered to the data acquisition board 12. The data acquisition board 12 is fixed to the inner bottom of the sensor unit housing 15. Four spring contacts 13 are welded to its lower end. A square through-hole is provided at the bottom of the sensor unit housing to accommodate the spring contacts 13 being welded to the data acquisition board 12, corresponding to the positive contact 131, negative contact 132, ground contact 133, and data transmission contact 134, respectively. A locking screw 14 is installed on the outside of the sensor unit housing 15 for fixing it to the lower housing 32. The locking screw 14 is a non-removable screw. The sensor unit housing 15 has an electromagnetic shielding structure.

[0030] like Figure 5 As shown, the collector unit 2 includes a data collection board 21, a collector main control chip 22, and wiring terminals 23. The data collection board 21 is a long strip-shaped multilayer printed circuit board with four copper-clad areas along its width: a positive-charge copper-clad area 211, a negative-charge copper-clad area 212, a ground copper-clad area 213, and a data transmission copper-clad area 214. The positive-charge copper-clad areas 211, 212, and 213 are arranged in a continuous "1" shape, with a length similar to that of the data collection board 21, serving as a parallel connection for current collection. The data collection board supplies power to the data acquisition board via the positive, negative, and ground contacts of the spring contacts in the positive, negative, and ground copper-clad areas. The data transmission copper-clad areas 214 are arranged intermittently at equal intervals, used to connect the data transmission nodes of each sub-sensor, with each segment independently connected to a different data acquisition channel of the collector main control chip 22. The main control chip 22 of the aggregator is soldered to the data aggregation board 21 and is used to process the current, voltage and other data uploaded by each sensor unit 1. The terminal block 23 is soldered to the end of the data aggregation board 21 and is electrically connected to the main control chip 22 of the aggregator and the data aggregation board 21 respectively, and is used for power supply. The main control chip 22 of the aggregator interacts with the external cable monitoring system through the terminal block 23.

[0031] like Figure 1 , Figure 3As shown, the supporting unit 3 includes a fixing plate 31, a lower housing 32, and an upper housing 33. One end of the fixing plate 31 is fixed to the lower housing 32, and the other end is used to fix it to the secondary screen cabinet 5. The lower housing 32 has a U-shaped structure with a through groove 321 inside, in which the collector unit 2 is fixed. The top end face of the lower housing 32 has fixing grooves 322 on both sides for detachably connecting the sensor unit 1, which are used to facilitate the elastic contact connection between the sensor unit 1 and the collector unit 2. During installation, the sensor unit 1 is embedded into the lower housing 32, ensuring that the four spring contacts 13 are in elastic and tight contact with the corresponding positive copper-plated areas 211, negative copper-plated areas 212, ground copper-plated areas 213, and data transmission copper-plated areas 214 on the data collection board 21. The locking screw 14 is rotated and tightened into the fixing slot 322, thus fixing a single sub-sensor. Multiple sub-sensors can be installed in the fixing slot. Because the spring contacts 13 have elastic extension and contraction, and the data transmission contacts 134 can establish communication upon contact with a single segment of the data transmission copper-plated area 214 for transmitting data from the tested cable, information from each sub-sensor is collected. Therefore, the sensor unit 1 can be adjusted within a certain range along the length of the data collection board 21 to accommodate different arrangements of the tested cables 4. The sensor unit 1, composed of multiple sub-sensors, can be arranged in a single row, suitable for engineering applications where the arrangement of the tested cables 4 is relatively spacious. The upper housing 33 is fixed to the upper end of the lower housing 32 for electrical protection of the entire device. The bearing unit is made of insulating material, and the fixing plate 31 is provided with multiple fixing points for adjusting the fixing position of the lower housing 32.

[0032] Example 3

[0033] Based on the same inventive concept as other embodiments, this embodiment introduces a non-invasive secondary cabinet cable current and voltage monitoring device, such as... Figure 2 As shown, it includes a sensor unit 1, a collector unit 2, and a carrier unit 3, with the sub-sensors in the sensor unit 1 closely arranged on the carrier unit 3.

[0034] Sensor unit 1 includes a sensor probe 11, a data acquisition board 12, a spring contact 13, a locking screw 14, and a sensor unit housing 15. The sensor probe 11 is an open-loop mutual inductance structure through which the cable under test 4 can pass, such as... Figure 8 , Figure 9As shown, the sensor unit housing 111 consists of a magnetic core 111 and an excitation coil 112, forming a mutual inductance structure. The inner side of the ring is the through-hole area for the cable 4 under test, while the outer side of the ring is surrounded by the magnetic core 111. The magnetic core 111 is a discontinuous structure that can be separated or engaged as the sensor probe 11 opens and closes. When engaged, the cross-section of the magnetic core 111 is tightly connected. The excitation coil 112 is a closed loop structure made of copper wire, which is engaged with the magnetic core 111. The axis of the magnetic core 111 is perpendicular to the axis of the excitation coil 112. The two ends of the excitation coil 112 are soldered to the data acquisition board 12. The data acquisition board 12 is fixed to the inner bottom of the sensor unit housing 15, and four spring contacts 13 are soldered to its lower end, corresponding to the positive contact 131, negative contact 132, ground contact 133, and data transmission contact 134, respectively. A locking screw 14 is installed on the outside of the sensor unit housing 15 for fixing to the lower housing 32.

[0035] like Figure 6 As shown, the collector unit 2 includes a data collection board 21, a collector main control chip 22, and terminal blocks 23. The data collection board 21 is a long, strip-shaped multilayer printed circuit board with five copper-clad areas along its width: a first data transmission copper-clad area 215, a positive voltage copper-clad area 211, a negative voltage copper-clad area 212, a ground copper-clad area 213, and a second data transmission copper-clad area 216. The positive voltage copper-clad area 211, the negative voltage copper-clad area 212, and the ground copper-clad area 213 are continuous U-shaped, serving as a parallel connection for current collection. The first data transmission copper-clad area 215 and the second data transmission copper-clad area 216 are intermittently arranged at equidistant ends, each segment independently connected to a different data acquisition channel of the collector main control chip 22. The collector main control chip 22 is soldered to the data collection board 21 and is used to process the current and voltage data uploaded by each sensor unit 1. Terminal blocks 23 are soldered to the end of the data collection board 21 and are used to connect to an external power supply and communicate with the monitoring system.

[0036] The supporting unit 3 includes a fixing plate 31, a lower housing 32, and an upper housing 33. For example... Figure 8As shown, one end of the fixing plate 31 is fixed to the lower housing 32, and the other end is used to fix it to the secondary cabinet 5. The lower housing 32 has a U-shaped structure with a through groove 321 inside, in which the collector unit 2 is fixed. The upper surface of the lower housing 32 has two fixing grooves 322. During installation, the sensor unit 1 is embedded into the lower housing 32, so that the four spring contacts 13 are in close contact with the corresponding copper-plated areas on the data collection board 21. The locking screw 14 is rotated and inserted into the fixing groove 322 and tightened to complete the fixing of a single sub-sensor. Since the spring contacts 13 have elastic extension and contraction, and the data transmission contact 134 can establish communication by contacting either the first data transmission copper-plated area 215 or the second data transmission copper-plated area 216, the sensor unit 1 can be adjusted in position along the length of the data collection board 21 within a certain range to adapt to the arrangement of different tested cables 4. Multiple sensor units 1 can be arranged in staggered double rows, which is suitable for engineering application scenarios where the spacing between tested cables 4 is small. The upper housing 33 is fixed to the upper end of the lower housing 32 and is used for electrical protection of the entire module.

[0037] Example 4

[0038] Based on the same inventive concept as other embodiments, this embodiment introduces a method for installing a non-intrusive secondary cabinet cable current and voltage monitoring device, such as... Figure 7 As shown, it specifically includes: Step S101: Fix the fixing plate 31 to a suitable position on the secondary screen cabinet 5 using screws; Step S102: Install the lower housing 32, which is pre-assembled with the collector unit 2, onto the fixing plate 31, and adjust its position to be between the secondary cabinet body 5 and the secondary cabinet terminal block 6. Step S103: Open the sensor probe 11, place the cable under test 4 inside the sensor probe 11 through area, and close the sensor probe 11 so that it surrounds the cable under test 4. Step S104: Electrically connect sensor unit 1 to collector unit 2, make spring contact 13 contact the corresponding copper-plated area on data collection board 21, and use locking screw 14 to fix sensor unit 1 to lower housing 32. Step S105, repeat steps S103-S104, and install the corresponding sensor unit 1 on all the cables 4 under test in sequence. Step S106: Fasten the upper housing 33 to the upper end of the lower housing 32.

[0039] In this implementation, the non-intrusive installation method for the cable current and voltage monitoring module in the secondary cabinet achieves rapid installation without interrupting the operation of the cable under test 4 through innovative design. First, the fixing plate 31 is fixed to a suitable position on the secondary cabinet body 5 using screws. The lower housing 32, pre-assembled with the collector unit 2, is then installed on the fixing plate 31. The fixing point position on the fixing plate 31 is adjusted according to the available space, ensuring that the lower housing 32 is positioned in the gap between the cabinet body and the terminal block, ensuring that the original wiring and operation are not affected. Next, the sensor probe 11 is opened, and the cable under test 4 is placed inside the sensor probe 11 through-hole area. The sensor probe 11 is closed so that it surrounds the cable under test 4. The sensor unit 1 is aligned with the corresponding position on the lower housing 32, so that the spring contact 13 contacts the copper-plated area on the data collection board 21. It is then finely adjusted along its length to a suitable position so that the cable under test 4 is not under pressure. The locking screw 14 is tightened to lock it into the fixing groove 322, completing the fixing of the sensor unit 1. Next, repeat the above steps, installing the corresponding sensor unit 1 on each of the tested cables 4 in sequence. The power supply for each sensor unit 1 is achieved through parallel connection of the positive copper-plated area 211, the negative copper-plated area 212, and the ground copper-plated area 213. Data is independently transmitted to the collector main control chip 22 through their respective contacted data transmission copper-plated areas 214, without interference. Finally, the upper housing 33 is fastened to the upper end of the lower housing 32, completing the electrical protection of the entire module.

[0040] In summary, this invention achieves truly non-intrusive online monitoring without requiring the removal of existing cables, interruption of equipment operation, or alteration of the secondary circuit topology during the entire installation process. Furthermore, the sensor unit can be flexibly adjusted according to the actual cable location, offering strong scalability and convenient assembly / disassembly. It effectively utilizes the narrow space between the cabinet and terminal blocks, ensuring a neat internal layout and reliable operation of the cabinet.

[0041] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0042] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A non-invasive secondary cabinet cable current and voltage monitoring device, characterized in that, include: Sensor unit, collector unit, and carrier unit; The sensor unit and the collector unit are disposed on the carrier unit; The sensor unit includes at least one sub-sensor; the sub-sensor includes a sensor probe, a data acquisition board, and a spring contact; the data acquisition board is electrically connected to the sensor probe; wherein, the sensor probe is an open-ring mutual inductance structure for adapting to the cable under test; The aggregator unit includes a data aggregator board, a aggregator main control chip, and wiring terminals; the data acquisition board is connected to the input terminal of the data aggregator board via the spring contact; the aggregator main control chip is connected to the output terminal of the data aggregator board and is used to receive data from each tested cable; the wiring terminals are electrically connected to the aggregator main control chip and the data aggregator board respectively; the aggregator main control chip interacts with the external cable monitoring system through the wiring terminals. The data aggregation board includes a data transmission copper-clad area, a positive-voltage copper-clad area, a negative-voltage copper-clad area, and a ground copper-clad area. The spring contacts include a data transmission contact for adapting to the data transmission copper-clad area, a positive contact for adapting to the positive-voltage copper-clad area, a negative contact for adapting to the negative-voltage copper-clad area, and a ground contact for adapting to the ground copper-clad area. The data aggregation board acquires the measured cable data output from the data acquisition board output terminal of each sub-sensor through the data transmission contacts. The data aggregation board supplies power to the data acquisition board through the positive-voltage copper-clad area, the negative-voltage copper-clad area, and the ground copper-clad area via the positive-voltage contact, the negative-voltage contact, and the ground contact of the spring contacts.

2. The non-intrusive secondary cabinet cable current and voltage monitoring device according to claim 1, characterized in that, The supporting unit includes a fixed plate, a lower housing, and an upper housing; the sensor unit is disposed in the upper housing. The lower housing is disposed on the fixing plate; a through groove for installing the collector unit is provided in the middle of the lower housing; fixing grooves for detachably connecting the sensor unit are provided on both sides of the top end face of the lower housing, for cooperating with the elastic contact connection between the sensor unit and the collector unit. The upper housing is mounted on the lower housing and is used for electrical protection of the sensor unit.

3. The non-intrusive secondary cabinet cable current and voltage monitoring device according to claim 1, characterized in that, The sub-sensor also includes a sensor unit housing disposed outside the sensor probe for electromagnetic shielding of the sensor probe.

4. The non-intrusive secondary cabinet cable current and voltage monitoring device according to claim 3, characterized in that, The data acquisition board is located on the bottom inner side of the sensor unit housing. A square through hole is provided at the bottom of the sensor unit housing for connecting the data acquisition board to the spring contacts.

5. The non-intrusive secondary cabinet cable current and voltage monitoring device according to claim 1, characterized in that, The sensor probe includes a magnetic core and an excitation coil; The magnetic core has a discontinuous structure and is used for opening and closing operations when installing the cable under test; the excitation coil is wound around the bottom of the magnetic core and the axis of the excitation coil is perpendicular to the axis of the magnetic core; the two ends of the excitation coil are respectively connected to the data acquisition board for acquiring data of the cable under test.

6. The non-intrusive secondary cabinet cable current and voltage monitoring device according to claim 1, characterized in that, The spring contact is welded to the bottom of the data acquisition board.

7. The non-intrusive secondary cabinet cable current and voltage monitoring device according to claim 1, characterized in that, The data acquisition boards of each sub-sensor are powered by parallel connection of the positively charged copper area, the negatively charged copper area, and the ground copper area of ​​the data aggregation board.

8. An installation method for a non-intrusive secondary cabinet cable current and voltage monitoring device as described in claim 1, characterized in that, include: The load-bearing unit is fixedly connected to the secondary screen cabinet body; The collector unit is positioned at the middle of the secondary cabinet and the terminal block corresponding to the bearing unit; After placing the cable under test in the inner core area of ​​the sensor probe using the sensor probe, the sensor unit is detachably connected to the carrier unit by tightening screws.

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