A neutral point resistance monitoring device with communication function

Abstract

The utility model relates to a technical problem to be solved is provided with a neutral point resistance monitoring device with communication function, the monitoring device can be installed on the existing neutral point grounding resistance cabinet and realizes remote tour, effectively improves tour efficiency and reduces the workload of manual tour. The device is applied to neutral point grounding resistance cabinet, and neutral point grounding resistance cabinet is provided with neutral point resistance monitoring structure through mounting structure, and neutral point resistance monitoring structure includes box, current sensor, voltage sensor, temperature sensor, monitoring mainboard, and the wireless networking communication module is integrally arranged on the monitoring mainboard, the monitoring mainboard passes through wireless networking communication module and MQTT agreement and cloud platform communication connection, and the data information of each sensor is sent to cloud platform by monitoring mainboard respectively gathering, and the operation of neutral point resistance is understood to realize remote tour through the data information of cloud platform of staff's access; through mounting structure, the installation efficiency is effectively improved, and the replacement cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of power distribution technology, specifically to a neutral point resistance monitoring device with communication function. Background Technology

[0002] Neutral point grounding resistors are key devices in power systems used to limit single-phase ground fault current and suppress overvoltage. Their core function is to ensure safe operation of the power grid by connecting a resistor in series between the neutral point and ground. Many existing neutral point grounding resistors are typically installed in neutral point grounding resistor cabinets in control rooms near transformers. These cabinets often lack monitoring equipment, relying on traditional manual inspections, which are inefficient and labor-intensive. Furthermore, installing existing monitoring equipment on these cabinets is problematic because the equipment is often dispersed and located far from the electrical control room, hindering centralized network control. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a neutral point resistance monitoring device with communication function. This monitoring device can be installed on the existing neutral point grounding resistor cabinet to realize remote inspection, effectively improving inspection efficiency and reducing the workload of manual inspection.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: a neutral point resistance monitoring device with communication function is applied to a neutral point grounding resistor cabinet. A neutral point grounding resistor is installed inside the neutral point grounding resistor cabinet. Lifting rings are installed at the four corners of the upper surface of the neutral point grounding resistor cabinet. A neutral point resistance monitoring structure is installed on the neutral point grounding resistor cabinet through an installation structure.

[0005] The neutral point resistance monitoring structure includes a housing, a current sensor, a voltage sensor, a temperature sensor, and a monitoring motherboard;

[0006] The enclosure is mounted above the neutral point grounding resistor cabinet via an installation structure. A cover is mounted on the enclosure via a hinged structure, and an anti-theft lock is mounted on the cover. The monitoring motherboard is located inside the enclosure.

[0007] The current sensor, voltage sensor, and temperature sensor are respectively installed inside the neutral point grounding resistor cabinet;

[0008] The current sensor is mounted on the conductor connecting the neutral point grounding resistor to the grounding grid. The current sensor is used to monitor the total current flowing through the neutral point grounding resistor. The voltage sensor is connected in parallel across the neutral point grounding resistor to monitor the voltage. The temperature sensor is placed on the surface of the neutral point grounding resistor to monitor the temperature of the neutral point grounding resistor.

[0009] The current sensor, voltage sensor, and temperature sensor are respectively connected to the monitoring motherboard signal via shielded signal cables;

[0010] The monitoring motherboard is equipped with a wireless network communication module, which communicates with the cloud platform via the wireless network communication module and the MQTT protocol.

[0011] Furthermore, the mounting structure includes two identical mounting components, which are respectively disposed on the left and right sides of the housing;

[0012] The mounting assembly includes a fixing rod disposed on the left or right side wall of the housing, wherein both ends of the fixing rod are provided with rectangular grooves and the length is less than half the length of the fixing rod;

[0013] A rectangular rod adapted to the rectangular groove is provided in the rectangular groove through a telescopic structure. One end of the rectangular rod extends to the outside of the rectangular groove, and the end face area of ​​the rectangular rod is larger than the area of ​​the circular hole of the lifting ring.

[0014] The rectangular rod is provided with a connecting rod adapted to the lifting ring at one end outside the rectangular groove. The connecting rod passes through the corresponding lifting ring and the outer end of the rectangular rod abuts against the lifting ring.

[0015] A limit structure is provided between the rectangular rod and the fixed rod.

[0016] Furthermore, the retractable structure includes a slide bar disposed at the bottom of the rectangular groove;

[0017] The rectangular rod has a sliding hole at one end near the bottom of the rectangular groove that is adapted to the sliding rod, and the sliding rod is located in the sliding hole;

[0018] A compression spring is provided between the rectangular rod and the bottom of the rectangular groove. The compression spring is sleeved on the outside of the slide rod. One end of the compression spring is located at the bottom of the rectangular groove, and the other end of the compression spring is located on the rectangular rod.

[0019] When the connecting rod passes through the corresponding lifting ring and the rectangular rod abuts against the lifting ring, the compression spring is in a compressed state. When the compression spring is fully compressed, the connecting rod disengages from the corresponding lifting ring.

[0020] Furthermore, the limiting structure includes a countersunk hole provided on the inner side wall of the box, the countersunk hole passing through the side wall of the box and the side wall of the rectangular groove in sequence;

[0021] The countersunk hole has an internal thread on its side wall, and a tightening bolt that matches the internal thread is installed inside the countersunk hole. When the tightening bolt is tightened, it abuts against the rectangular rod to fix it completely.

[0022] Furthermore, multiple access terminals are also provided, including but not limited to computer terminals, mobile terminals, and WeChat mini programs;

[0023] The computer terminal accesses the cloud platform via wired or wireless communication, while the mobile terminal and WeChat mini-program access the cloud platform via wireless communication.

[0024] Furthermore, the monitoring motherboard uses an STM32 series MCU.

[0025] Furthermore, a display screen is embedded in the front side wall of the enclosure, and the display screen is connected to the monitoring motherboard via a shielded signal cable.

[0026] The beneficial effects of this utility model are as follows:

[0027] 1. The neutral point resistance is monitored in real time by setting current sensors, voltage sensors, and temperature sensors. The monitoring motherboard collects data information from the current sensors, voltage sensors, and temperature sensors respectively and sends it to the cloud platform through the set wireless network communication module and MQTT protocol. Staff can remotely inspect the neutral point resistance by accessing the data information on the cloud platform, which effectively improves inspection efficiency and reduces the workload of manual inspection.

[0028] 2. The installation structure allows the neutral point resistance monitoring device to be quickly installed on the existing neutral point grounding resistance cabinet for monitoring without the need to replace it with a new neutral point grounding resistance cabinet with monitoring function, effectively improving installation efficiency and reducing replacement costs. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the combined structure of a neutral point resistance monitoring device with communication function and a neutral point grounding resistance cabinet according to the present invention;

[0030] Figure 2 This is a schematic diagram of the neutral point resistance monitoring device with communication function described in this utility model;

[0031] Figure 3 This is a schematic diagram of the structure of the neutral point resistance monitoring device with communication function described in this utility model;

[0032] Figure 4 This is a side view of the assembly structure and lifting ring combination structure described in this utility model;

[0033] Figure 5 This is a perspective view of the internal structure of the mounting component described in this utility model;

[0034] Figure 6 This is a perspective view of the fixing rod described in this utility model;

[0035] Figure 7 This is an exploded view of the retractable structure and rectangular rod described in this utility model;

[0036] The markings in the diagram are as follows: 1. Neutral point grounding resistor cabinet; 2. Lifting ring; 3. Neutral point resistance monitoring structure; 301. Box body; 302. Current sensor; 303. Voltage sensor; 304. Temperature sensor; 305. Monitoring motherboard; 306. Box cover; 307. Anti-theft lock; 308. Wireless network communication module; 4. Installation component; 401. Fixing rod; 402. Rectangular groove; 403. Rectangular rod; 404. Connecting rod; 405. Sliding rod; 406. Sliding hole; 407. Compression spring; 5. Countersunk hole; 6. Computer terminal; 7. Mobile terminal; 8. WeChat mini-program; 9. Display screen; 10. Neutral point grounding resistor; 11. Cloud platform; 12. Neutral point; 13. Tightening bolt. Detailed Implementation

[0037] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] It should be noted that all directional indicator terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" in the embodiments of this application indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. They are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0039] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0041] like Figure 1-7 As shown, a neutral point resistance monitoring device with communication function is applied to a neutral point grounding resistor cabinet 1. The neutral point grounding resistor cabinet 1 is equipped with a neutral point grounding resistor 10. The grounding resistor is connected in series between the neutral point 12 and the ground to limit the single-phase ground fault current and suppress overvoltage. Lifting rings 2 are provided at the four corners of the upper surface of the neutral point grounding resistor cabinet 1. A neutral point resistance monitoring structure 3 is installed on the neutral point grounding resistor cabinet 1 through an installation structure.

[0042] The neutral point resistance monitoring structure 3 includes a housing 301, a current sensor 302, a voltage sensor 303, a temperature sensor 304, and a monitoring motherboard 305;

[0043] The enclosure 301 is mounted on top of the neutral point grounding resistor cabinet 1 via an installation structure. The enclosure 301 is fitted with a cover 306 via a hinge structure. The cover 306 is fitted with an anti-theft lock 307. The anti-theft lock 307 is used to lock the free end of the cover 306 to the enclosure 301 as a whole, thereby achieving the purpose of anti-theft and preventing the cover 306 from being opened at will. The monitoring motherboard 305 is located inside the enclosure 301.

[0044] The current sensor 302, voltage sensor 303, and temperature sensor 304 are respectively installed in the neutral point grounding resistor cabinet 1;

[0045] The current sensor 302 is mounted on the conductor connecting the neutral point grounding resistor 10 to the grounding grid. The current sensor 302 is used to monitor the total current flowing through the neutral point grounding resistor 10. The voltage sensor 303 is connected in parallel across the neutral point grounding resistor 10 to monitor the voltage. The temperature sensor 304 is disposed on the surface of the neutral point grounding resistor 10 to monitor the temperature of the neutral point grounding resistor 10.

[0046] The current sensor 302, voltage sensor 303, temperature sensor 304, and the controller inside the neutral point grounding resistor cabinet 1 are respectively connected to the monitoring motherboard 305 via shielded signal cables. Specifically, the bottom of the enclosure 301 and the upper side wall of the neutral point grounding resistor cabinet 1 have corresponding wire-passing holes. The shielded signal cables pass through these holes into the enclosure 301 and connect to the monitoring motherboard 305. The monitoring motherboard 305 collects current data from the current sensor 302 in real time and provides an alert for any anomalies; it also collects voltage data from the voltage sensor 303 in real time and provides an alert for any anomalies; and it collects temperature data from the temperature sensor 304 in real time and provides an alert for any anomalies.

[0047] The monitoring motherboard 305 integrates a wireless network communication module 308, preferably a 4G / 5G wireless network communication module 308. The monitoring motherboard 305 communicates with the cloud platform 11 via the wireless network communication module 308 and the MQTT protocol. The monitoring motherboard 305 collects data information from the current sensor 302, voltage sensor 303, and temperature sensor 304 in real time and transmits it synchronously to the cloud platform 11 via the wireless network communication module 308 and the MQTT protocol. Staff can view the data information in real time by accessing the cloud platform 11 to achieve the purpose of remote inspection. The monitoring motherboard 305 also has the function of receiving control signals sent back by the cloud platform 11 via the MQTT protocol to control the working mode of the neutral point grounding resistor 10.

[0048] like Figure 3-7 As shown, in this embodiment, preferably, the mounting structure includes two identical mounting components 4, which are respectively disposed on the left and right sides of the housing 301.

[0049] The installation component 4 includes a fixing rod 401 disposed on the left or right side wall of the housing 301, that is, there are two fixing rods 401 disposed on the left and right side walls of the housing 301 respectively. Both ends of the fixing rod 401 are provided with rectangular grooves 402 and the length is less than half the length of the fixing rod 401. That is, both ends of each fixing rod 401 are provided with rectangular grooves 402, and there are a total of four rectangular grooves 402. The bottom of each rectangular groove 402 extends toward the middle of the corresponding fixing rod 401.

[0050] The rectangular groove 402 is provided with a retractable structure to accommodate four rectangular rods 403. One end of each rectangular rod 403 extends to the outside of the rectangular groove 402. The end face area of ​​each rectangular rod 403 is larger than the area of ​​the circular hole of the lifting ring 2. This means that the depth of the rectangular rod 403 in the rectangular groove 402 can be adjusted by the retractable structure, thereby adjusting the relative length between the rectangular rod 403 and the fixed rod 401.

[0051] The rectangular rod 403 is provided with a connecting rod 404 adapted to the lifting ring 2 at one end outside the rectangular groove 402. When the relative length of the rectangular rod 403 and the fixed rod 401 increases through the telescopic structure, the connecting rod 404 passes through the corresponding lifting ring 2 and the outer end of the rectangular rod 403 abuts against the lifting ring 2. With the four connecting rods 404 passing through the corresponding lifting ring 2 respectively, and the four rectangular rods 403 abutting against the corresponding lifting ring 2 respectively, since the end face area of ​​the rectangular rod 403 is larger than the area of ​​the circular hole of the lifting ring 2, it is ensured that the rectangular rod 403 will not pass through the corresponding lifting ring 2 and can be locked. With the four rectangular rods 403 and the four connecting rods 404, the box 301 can be completely fixed above the neutral point grounding resistor cabinet 1.

[0052] A limiting structure is provided between the rectangular rod 403 and the fixed rod 401. The limiting structure locks the rectangular rod 403 and the fixed rod 401 together, so that the connecting rod 404 will not detach from the corresponding lifting ring 2. At the same time, it also ensures the stability of the connecting rod 404 and the fixed rod 401, so that the box 301 will not shake at will and will always maintain an integral state with the neutral point grounding resistor cabinet 1.

[0053] like Figure 5-7 As shown, in this embodiment, preferably, the retractable structure includes a slide bar 405 disposed at the bottom of the rectangular groove 402;

[0054] The rectangular rod 403 has a sliding hole 406 at one end near the bottom of the rectangular groove 402, which is adapted to the sliding rod 405. The sliding rod 405 is located in the sliding hole 406.

[0055] A compression spring 407 is provided between the rectangular rod 403 and the bottom of the rectangular groove 402. The compression spring 407 is sleeved on the outside of the slide rod 405. One end of the compression spring 407 is provided at the bottom of the rectangular groove 402, and the other end of the compression spring 407 is provided on the rectangular rod 403.

[0056] When the connecting rod 404 passes through the corresponding lifting ring 2 and the rectangular rod 403 abuts against the lifting ring 2, the compression spring 407 remains compressed. The compression spring 407 applies force to the rectangular rod 403, preventing the connecting rod 404 from disengaging from the corresponding lifting ring 2, and also ensuring that the rectangular rod 403 always abuts against the lifting ring 2. At this time, the sliding rod 405 remains within the sliding hole 406 and will not disengage. When the compression spring 407 is fully compressed, the connecting rod 404 disengages from the corresponding lifting ring 2, facilitating the installation and disassembly of the housing 301.

[0057] like Figure 4-6As shown, in this embodiment, preferably, the limiting structure includes a countersunk hole 5 provided on the inner side wall of the housing 301. The countersunk hole 5 passes through the side wall of the housing 301 and the side wall of the rectangular groove 402 in sequence, that is, the countersunk hole 5 is connected to the rectangular groove 402 on the corresponding side.

[0058] The countersunk hole 5 has an internal thread on its side wall, and a tightening bolt 12 matching the internal thread is installed inside the countersunk hole 5. When the tightening bolt 12 is tightened, it abuts against the rectangular rod 403 to fix it completely. The rectangular rod 403 can be completely fixed by the compression spring 407 and the corresponding tightening bolt 12. In addition, since the countersunk hole 5 is located on the inner side wall of the box 301, the tightening bolt 12 cannot be turned from the outside, which further improves the anti-theft performance of the box 301.

[0059] like Figure 2 As shown, in this embodiment, in order to facilitate access to the cloud platform 11 to view data information, multiple access terminals are also provided. The multiple access terminals include, but are not limited to, computer terminal 6, mobile phone terminal 7, and WeChat mini program 8.

[0060] The computer terminal 6 accesses the cloud platform 11 via wired or wireless communication, while the mobile terminal 7 and WeChat mini-program 8 access the cloud platform 11 via wireless communication. The computer terminal 6 allows for remote inspection of the cloud platform 11 indoors, while the mobile terminal 7 and WeChat mini-program 8 allow for remote inspection of the cloud platform 11 outdoors, enabling viewing without location restrictions.

[0061] In this embodiment, preferably, the monitoring motherboard 305 uses an STM32 series MCU. This series of MCUs can perform tasks such as sensor data acquisition, 4G / 5G communication, and data processing. The system response is real-time and stable, making it very suitable for industrial environments.

[0062] like Figure 3 As shown in this embodiment, preferably, a display screen 9 is embedded in the front side wall of the housing 301. The display screen 9 is connected to the monitoring motherboard 305 via a shielded signal cable. The display screen 9 allows for convenient viewing of relevant data information, facilitating inspection and maintenance by staff.

[0063] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A neutral point resistance monitoring device with communication function, applied to a neutral point grounding resistor cabinet (1), wherein a neutral point grounding resistor (10) is installed inside the neutral point grounding resistor cabinet (1), and lifting rings (2) are installed at the four corners of the upper surface of the neutral point grounding resistor cabinet (1), characterized in that: The neutral point grounding resistor cabinet (1) is equipped with a neutral point resistance monitoring structure (3) through an installation structure. The neutral point resistance monitoring structure (3) includes a housing (301), a current sensor (302), a voltage sensor (303), a temperature sensor (304), and a monitoring motherboard (305). The enclosure (301) is mounted above the neutral point grounding resistor cabinet (1) via an installation structure. The enclosure (301) is provided with a cover (306) via a hinge structure. The cover (306) is provided with an anti-theft lock (307). The monitoring main board (305) is located inside the enclosure (301). The current sensor (302), voltage sensor (303), and temperature sensor (304) are respectively installed inside the neutral point grounding resistor cabinet (1); The current sensor (302) is mounted on the conductor connecting the neutral point grounding resistor (10) to the grounding grid. The current sensor (302) is used to monitor the total current flowing through the neutral point grounding resistor (10). The voltage sensor (303) is connected in parallel across the neutral point grounding resistor (10) to monitor the voltage. The temperature sensor (304) is placed on the surface of the neutral point grounding resistor (10) to monitor the temperature of the neutral point grounding resistor (10). The current sensor (302), voltage sensor (303), and temperature sensor (304) are respectively connected to the monitoring motherboard (305) via shielded signal cables; The monitoring motherboard (305) is equipped with a wireless network communication module (308), and the monitoring motherboard (305) communicates with the cloud platform (11) through the wireless network communication module (308) and the MQTT protocol.

2. The neutral point resistance monitoring device with communication function according to claim 1, characterized in that: The mounting structure includes two identical mounting components (4) which are respectively located on the left and right sides of the housing (301); The mounting assembly (4) includes a fixing rod (401) provided on the left or right side wall of the housing (301). Both ends of the fixing rod (401) are provided with rectangular grooves (402) and the length is less than half the length of the fixing rod (401). The rectangular groove (402) is provided with a retractable structure and a rectangular rod (403) adapted to it. One end of the rectangular rod (403) extends to the outside of the rectangular groove (402), and the end face area of ​​the rectangular rod (403) is larger than the area of ​​the circular hole of the lifting ring (2). The rectangular rod (403) is provided with a connecting rod (404) adapted to the lifting ring (2) at one end outside the rectangular groove (402). The connecting rod (404) passes through the corresponding lifting ring (2) and the outer end of the rectangular rod (403) abuts against the lifting ring (2). A limiting structure is provided between the rectangular rod (403) and the fixed rod (401).

3. A neutral point resistance monitoring device with communication function according to claim 2, characterized in that: The retractable structure includes a slide bar (405) disposed at the bottom of the rectangular groove (402). The rectangular rod (403) has a sliding hole (406) at one end near the bottom of the rectangular groove (402) that is adapted to the sliding rod (405), and the sliding rod (405) is located in the sliding hole (406); A compression spring (407) is provided between the rectangular rod (403) and the bottom of the rectangular groove (402). The compression spring (407) is sleeved on the outside of the slide rod (405). One end of the compression spring (407) is provided at the bottom of the rectangular groove (402), and the other end of the compression spring (407) is provided on the rectangular rod (403). When the connecting rod (404) passes through the corresponding lifting ring (2) and the rectangular rod (403) abuts against the lifting ring (2), the compression spring (407) is in a compressed state. When the compression spring (407) is fully compressed, the connecting rod (404) disengages from the corresponding lifting ring (2).

4. A neutral point resistance monitoring device with communication function according to claim 2, characterized in that: The limiting structure includes a countersunk hole (5) provided on the inner side wall of the box (301), the countersunk hole (5) passing through the side wall of the box (301) and the side wall of the rectangular groove (402) in sequence; The countersunk hole (5) has an internal thread on its side wall. The countersunk hole (5) is provided with a tightening bolt (12) that matches the internal thread. When the tightening bolt (12) is tightened, the tightening bolt (12) abuts against the rectangular rod (403) to fix it completely.

5. A neutral point resistance monitoring device with communication function according to any one of claims 1-4, characterized in that: Multiple access terminals are also provided, including but not limited to computer terminals (6), mobile terminals (7), and WeChat mini programs (8). The computer terminal (6) accesses the cloud platform (11) via wired or wireless communication, while the mobile terminal (7) and WeChat mini-program (8) access the cloud platform (11) via wireless communication.

6. A neutral point resistance monitoring device with communication function according to claim 5, characterized in that: The monitoring motherboard (305) uses an STM32 series MCU.

7. A neutral point resistance monitoring device with communication function according to claim 6, characterized in that: The front wall of the enclosure (301) is equipped with a display screen (9), which is connected to the monitoring motherboard (305) via a shielded signal cable.

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