Portable 0.4 kilovolt low-voltage equipment contact fault monitoring and early warning system

Abstract

The utility model discloses a portable 0.4 kilovolt low-voltage equipment contact fault monitoring and early warning system, and belongs to the technical field of power system low-voltage distribution monitoring. The device comprises a device host, a device fixing part and an acquisition and measurement device, the device host is detachably fixed in a 0.4 kilovolt power supply switch box through the device fixing part, and the device host acquires operating parameters in the 0.4 kilovolt power supply switch box through the acquisition and measurement device; the acquisition and measurement device comprises at least one current acquisition probe and at least one comprehensive acquisition probe; the current acquisition probe is an annular current clamp and is electrically connected with the device host, and at least one comprehensive acquisition probe is installed on the current acquisition probe. The research and development aim of the utility model is to solve the problems of poor portability, complex installation, insufficient safety and incapability of multi-parameter comprehensive judgment of contact faults in the prior art, and meet the intelligent monitoring requirements of important power customers in a temporary power supply guarantee scene.

Description

Technical Field

[0001] This utility model relates to a portable 0.4 kV low-voltage equipment contact fault monitoring and early warning system, belonging to the field of low-voltage power distribution monitoring technology. Background Technology

[0002] With the rapid advancement of new power system construction, the number of important power customers in the 0.4 kV low-voltage distribution field is constantly increasing, and various temporary power supply tasks are becoming increasingly heavy. Most electrical fires originate from contact problems such as aging of low-voltage lines, overload, or loose connections. Poor contact, when reaching a certain high temperature, can cause electrical circuit connection failures, posing a significant fire hazard.

[0003] Currently, the main technical problems with power supply monitoring methods for 0.4 kV low-voltage systems are as follows:

[0004] First, traditional monitoring methods rely on manual inspections, which are inefficient and unreliable. Currently, the power supply guarantee for the 0.4 kV system mainly relies on manual inspections by technicians, which is time-consuming and labor-intensive, and cannot achieve 24 / 7 real-time monitoring. Manual inspections have obvious blind spots and lags, making it difficult to detect hidden faults such as loose terminals, oxidation leading to poor connections, and overheating in a timely manner. By the time a fault is discovered, it has often developed into equipment burnout or even a power outage.

[0005] Secondly, existing online monitoring devices are structurally complex and cannot meet the portability requirements of temporary power supply scenarios. Most existing low-voltage power distribution monitoring systems on the market are fixed installation devices, requiring professional personnel for wiring and installation. These systems are complex, costly, and cannot meet the needs for rapid deployment, flexible disassembly, and immediate use in temporary power supply tasks. For short-term, temporary events, there is a lack of portable monitoring devices that can be quickly carried and easily installed.

[0006] Third, there is a lack of multi-parameter integrated monitoring methods for contact faults. Existing monitoring technologies often use single-parameter monitoring, such as monitoring only temperature or only current, which cannot accurately distinguish between different types of faults such as "overload heating" and "loose connection heating". For "loose connection" type contact faults commonly found in low-voltage power distribution systems, it is necessary to simultaneously collect multi-dimensional parameters such as current, voltage, and temperature at the same monitoring point and perform comprehensive logical judgment in order to accurately identify the fault type and avoid false alarms and missed alarms.

[0007] Fourth, the probe installation lacks safety and poses a short-circuit risk. Existing monitoring devices often use exposed metal probes to contact live terminals when collecting voltage and temperature data. Improper installation or inadequate probe insulation can easily cause short circuits between adjacent terminals, leading to safety accidents.

[0008] Therefore, there is an urgent need to propose a portable 0.4 kV low-voltage equipment contact fault monitoring and early warning system to solve the above-mentioned technical problems. Utility Model Content

[0009] The purpose of this invention is to address the problems of poor portability, complex installation, insufficient security, and inability to comprehensively assess contact faults using multiple parameters in existing technologies, thereby meeting the intelligent monitoring needs of important power customers in temporary power supply scenarios. A brief overview of this invention is provided below to offer a basic understanding of certain aspects of it. It should be understood that this overview is not an exhaustive summary of the invention. It is not intended to identify key or essential parts of the invention, nor is it intended to limit the scope of the invention.

[0010] The technical solution of this utility model:

[0011] A portable 0.4 kV low-voltage equipment contact fault monitoring and early warning system includes a main unit, a device fixing component, and a data acquisition and measurement device. The main unit is detachably fixed inside a 0.4 kV power supply switch box via the device fixing component, and the main unit collects the operating parameters inside the 0.4 kV power supply switch box via the data acquisition and measurement device.

[0012] The acquisition and measurement device includes at least one current acquisition probe and at least one integrated acquisition probe;

[0013] The current acquisition probe is a ring-shaped current clamp, which is electrically connected to the main unit of the device. At least one integrated acquisition probe is installed on the current acquisition probe.

[0014] Preferably, the integrated acquisition probe includes a metal-shaped flexible tube and a probe end. One end of the metal-shaped flexible tube is fixedly installed on the current acquisition probe, and the other end of the metal-shaped flexible tube is equipped with the probe end. The probe end is provided with a metal probe and a temperature sensor. The metal probe extends out of the probe end, and the temperature sensor is attached to the root of the metal probe. The metal probe and the temperature sensor are electrically connected to the main unit of the device.

[0015] Preferably, the metal probe is covered with a probe insulating layer except for the tip contact.

[0016] Preferably, an elastic buffer structure is provided between the probe tip and the metal shaping hose, allowing the metal probe to move elastically along the axial direction.

[0017] Preferably, the elastic buffer structure includes an outer shell, a retaining ring, a spring, and an insulating connection. The outer shell is connected to the end of the metal shaping hose through the insulating connection. A retaining ring is provided between the outer shell and the metal shaping hose. One end of the probe protrudes from the outer shell, and the other end of the probe is slidably installed inside the outer shell. A spring is provided inside the outer shell, and both ends of the spring are respectively pressed against the probe end and the retaining ring.

[0018] Preferably, the metal-shaped flexible tube is a plastic-coated metal flexible tube, with an inner metal shaping layer and an outer insulating plastic layer.

[0019] Preferably, the fixing component of the device is one of a magnetic base, a snap-fit ​​structure, a bolt connection structure, or a hook structure.

[0020] Preferably, the main unit of the device is equipped with a power module, an intelligent control unit and a wireless communication module connected to the power module, and the power module includes a battery unit and / or a power conversion unit that draws power from a 0.4 kV line.

[0021] This utility model has the following beneficial effects:

[0022] 1. This utility model adopts a structural design that combines the main device and the device fixing components. The device fixing components are magnetic bases, snap-fit ​​structures, bolt connection structures or hook structures, which can realize the detachable and quick installation of the main device in a 0.4 kV power supply switch box without the need for professional tools and complex wiring, meeting the portable needs of temporary power supply scenarios for immediate installation and immediate use and disassembly after use.

[0023] 2. This utility model integrates a comprehensive acquisition probe onto a current acquisition probe, connecting the probe end via a flexible metal tube, thus achieving simultaneous acquisition of three parameters—current, voltage, and temperature—at the same monitoring point. The flexible metal tube can be bent arbitrarily while maintaining its shape, facilitating precise alignment of the terminals under test within confined electrical boxes, providing an accurate multi-dimensional data foundation for diagnosing contact faults.

[0024] 3. This utility model wraps the metal probe with an insulating layer except for the tip contact, ensuring that even if the probe accidentally touches an adjacent terminal or a grounded box when in contact with a live terminal, it will not cause a short circuit accident, thus fundamentally solving the short circuit risk problem in the installation process of existing monitoring probes;

[0025] 4. This utility model sets an elastic buffer structure between the probe tip and the metal shaped flexible tube. Through the cooperation of the outer shell, retaining ring, spring and insulating connection, the probe tip is allowed to move elastically along the axis, ensuring that the probe is always in close contact with the terminal surface and will not loosen due to equipment vibration or external force interference, thus ensuring the long-term stability of data acquisition.

[0026] 5. This utility model uses a plastic-coated metal flexible tube as the shaping structure. The inner metal layer ensures the bending and shaping capability, while the outer insulating plastic layer provides electrical insulation protection. The main unit of the device is equipped with multiple pluggable probe interfaces, which can flexibly configure the number and type of probes according to actual monitoring needs to meet the installation and use requirements of different switch box structures. Attached Figure Description

[0027] Figure 1 This is a schematic diagram showing the interaction between the main unit and the data acquisition and measurement device;

[0028] Figure 2 This is a schematic diagram showing the interaction between the main unit of the device and the 0.4 kV power supply switch box;

[0029] Figure 3 It is a three-dimensional diagram of the data acquisition and measurement device;

[0030] Figure 4 This is a diagram showing the usage status of the data acquisition and measurement device;

[0031] Figure 5 This is a schematic diagram of the probe tip assembly.

[0032] In the diagram, 1-device main unit, 2-device fixing component, 3-acquisition and measurement device, 4-0.4 kV power supply switch box, 31-current acquisition probe, 32-integrated acquisition probe, 321-metal shaping flexible tube, 322-probe end, 3221-metal probe, 3222-temperature sensor, 3223-probe insulation layer, 3224-elastic buffer structure, 301-outer shell, 302-retaining ring, 303-spring, 304-insulating connection part. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the present utility model. Furthermore, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily obscuring the concept of the present utility model.

[0034] The connections mentioned in this utility model are divided into fixed connections and detachable connections. Fixed connections, also known as non-detachable connections, include but are not limited to conventional fixed connection methods such as folded connections, riveted connections, adhesive connections, and welded connections. Detachable connections include but are not limited to conventional disassembly methods such as threaded connections, snap-fit ​​connections, pin connections, and hinged connections. When a specific connection method is not explicitly defined, it is assumed that at least one existing connection method can always be found to achieve the function, and those skilled in the art can choose according to their needs. For example, a welded connection can be chosen for fixed connections, and a hinged connection can be chosen for detachable connections.

[0035] Example 1: Combination Figures 1-5 This embodiment describes a portable 0.4 kV low-voltage equipment contact fault monitoring and early warning system, comprising a main unit 1, a device fixing component 2, and a data acquisition and measurement device 3. The main unit 1 is detachably fixed inside a 0.4 kV power supply switch box 4 via the device fixing component 2, and the main unit 1 collects operating parameters from inside the 0.4 kV power supply switch box 4 via the data acquisition and measurement device 3.

[0036] The data acquisition and measurement device 3 includes at least one current acquisition probe 31 and at least one integrated acquisition probe 32. In this embodiment, there are three current acquisition probes 31 and three integrated acquisition probes 32, which correspond to the monitoring requirements of phases A, B, and C in the 0.4 kV power supply switch box 4, respectively.

[0037] The current acquisition probe 31 is a ring-shaped current clamp, which is electrically connected to the main unit 1 of the device. Specifically, the current acquisition probe 31 includes an openable clamp body and a current sensing coil disposed inside the clamp body. The clamp body can clamp onto the circuit under test and acquire current data non-contactly through the principle of electromagnetic induction. The current acquisition probe 31 is connected to the main unit 1 of the device via a first flexible cable, the end of which is provided with a first connector for plug-in connection with the probe interface 11 on the main unit 1.

[0038] At least one integrated acquisition probe 32 is mounted on the current acquisition probe 31. The integrated acquisition probe 32 includes a metal-shaped flexible tube 321 and a probe end 322. One end of the metal-shaped flexible tube 321 is fixedly mounted on the current acquisition probe 31, and the probe end 322 is mounted on the other end of the metal-shaped flexible tube 321.

[0039] The metal-shaped flexible tube 321 is a plastic-coated metal flexible tube, with an inner metal shaping layer and an outer insulating plastic layer. In this embodiment, the metal-shaped flexible tube 321 can be bent arbitrarily and maintain its shape, which facilitates precise alignment of the terminal to be tested in a narrow distribution box.

[0040] The probe tip 322 houses a metal probe 3221 and a temperature sensor 3222. The metal probe 3221 extends beyond the probe tip 322 to contact the terminal under test and collect voltage signals. The temperature sensor 3222 is attached to the base of the metal probe 3221 to collect temperature data from the terminal. The metal probe 3221 and temperature sensor 3222 are connected to a second flexible cable via internal wires. The second flexible cable passes inside a metal flexible tube 321 and has a second connector at its end, which plugs into the probe interface on the main unit 1 to achieve electrical connection with the main unit 1.

[0041] The metal probe 3221 is covered with a probe insulating layer 3223 in addition to the tip contact. In this embodiment, the probe insulating layer 3223 is a high-strength insulating varnish or heat-shrink tubing, ensuring that when the probe contacts a live terminal, it will not cause a short circuit even if it accidentally touches an adjacent terminal or a grounded enclosure.

[0042] An elastic buffer structure 3224 is provided between the probe tip 322 and the metal shaping hose 321, allowing the metal probe 3221 to move elastically along the axial direction. Specifically, the elastic buffer structure 3224 includes a housing 301, a retaining ring 302, a spring 303, and an insulating connection part 304. The housing 301 is connected to the end of the metal shaping hose 321 through the insulating connection part 304, and a retaining ring 302 is provided between the housing 301 and the metal shaping hose 321. One end of the probe tip 322 protrudes from the housing 301, and the other end of the probe tip 322 is slidably installed inside the housing 301. A spring 303 is provided inside the housing 301, and both ends of the spring 303 are respectively pressed against the probe tip 322 and the retaining ring 302. After the metal probe 3221 contacts the terminal, if it is pushed gently, the spring 303 is compressed to generate a rebound force, ensuring that the probe always keeps in close contact with the terminal surface and will not loosen due to equipment vibration.

[0043] The second flexible cable is a dual-core shielded cable structure. Specifically, the second flexible cable includes a first core wire, a second core wire, a shielding layer, and an outer sheath. The first core wire is electrically connected to a metal probe for transmitting voltage signals; the second core wire is electrically connected to a temperature sensor for transmitting temperature signals; each core wire has an independent insulation layer. The shielding layer wraps around each core wire for interference suppression and grounding protection. The outer sheath wraps around the shielding layer for mechanical protection. This structure ensures that voltage and temperature signals do not interfere with each other and has good electrical insulation performance.

[0044] The main unit 1 of the device internally includes a power module, an intelligent control unit, and a wireless communication module. The power module includes a battery unit and / or a power conversion unit drawing power from a 0.4 kV line, providing operating power for the entire device. The intelligent control unit is electrically connected to each probe and is responsible for processing and preliminary analysis of the collected data. The wireless communication module is connected to the intelligent control unit and is used to transmit the collected data to a remote analysis platform. In this embodiment, the wireless communication module is a 4G communication module; however, a WiFi module, Bluetooth module, or NB-IoT module can also be selected according to actual needs.

[0045] The main unit 1 of the device has multiple probe interfaces, status indicator lights, and a display screen on its casing. The probe interfaces are aviation plug-type interfaces with locking clips to prevent loosening, used for connecting the first and second connectors. The status indicator lights indicate the device's operating status, communication status, and alarm status. The display screen shows real-time acquired data and device operating parameters.

[0046] The device fixing component 2 is a magnetic base. In this embodiment, the bottom of the main unit 1 is provided with a magnetic base, which can be attached to the iron inner wall of the 0.4 kV power supply switch box 4. Depending on the actual installation environment, the device fixing component 2 can also be selected from one of the following: a snap-fit ​​structure, a bolt connection structure, or a hook structure.

[0047] When conducting temporary power supply monitoring, first select an appropriate number of current acquisition probes 31 and integrated acquisition probes 32 according to the monitoring requirements. Then, install the main unit 1 onto the inner wall or guide rail of the 0.4 kV power supply switch box 4 using the device fixing component 2.

[0048] Then, open the clamp body of the current acquisition probe 31 and clamp it onto the wire of the circuit to be tested. Bend the metal shaping hose 321 of the integrated acquisition probe 32 to a suitable angle and shape, so that the probe tip 322 is aligned with the terminal to be tested. Press the tip of the metal probe 3221 against the metal part of the terminal and continue to push gently for about 1-2mm to compress the spring 303 of the elastic buffer structure 3224, ensuring reliable contact.

[0049] Insert the first and second connectors into the corresponding probe interfaces of the main unit 1 to complete the electrical connection. Start the main unit 1; the status indicator light will illuminate, and the display screen will show the real-time acquired data. The main unit 1 transmits the acquired current, voltage, and temperature data to a remote analysis platform via the wireless communication module for real-time monitoring by power supply technicians.

[0050] After the monitoring task is completed, disconnect each probe connector, remove the current acquisition probe 31 from the power cord, remove the integrated acquisition probe 32 from the terminal block, and remove the main unit 1 from the switch box. Once disassembly is complete, the device can be used for the next monitoring task.

[0051] This embodiment, through the above structural design, realizes portable, multi-parameter, safe and reliable contact fault monitoring and early warning for 0.4 kV low-voltage power distribution equipment, which is particularly suitable for temporary power supply scenarios for important power customers.

[0052] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present utility model, or modify it into equivalent embodiments, without departing from the scope of the present utility model's technical solution. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model, without departing from the content of the present utility model's technical solution, shall still fall within the protection scope of the present utility model's technical solution.

Claims

1. A portable 0.4 kilovolt low voltage equipment contact fault monitoring and warning system characterized by: It includes a main unit (1), a fixed component (2), and a data acquisition and measurement device (3). The main unit (1) is detachably fixed in the 0.4 kV power supply switch box (4) through the fixed component (2). The main unit (1) acquires the operating parameters in the 0.4 kV power supply switch box (4) through the data acquisition and measurement device (3). The acquisition and measurement device (3) includes at least one current acquisition probe (31) and at least one integrated acquisition probe (32). The current acquisition probe (31) is a ring current clamp, which is electrically connected to the host device (1). At least one integrated acquisition probe (32) is installed on the current acquisition probe (31).

2. The portable 0.4 kV low voltage equipment contact fault monitoring and early warning system according to claim 1, characterized in that: The integrated acquisition probe (32) includes a metal-shaped flexible tube (321) and a probe end (322). One end of the metal-shaped flexible tube (321) is fixedly installed on the current acquisition probe (31), and the other end of the metal-shaped flexible tube (321) is equipped with the probe end (322). The probe end (322) is provided with a metal probe (3221) and a temperature sensor (3222). The metal probe (3221) extends out of the probe end (322), and the temperature sensor (3222) is attached to the root of the metal probe (3221). The metal probe (3221) and the temperature sensor (3222) are electrically connected to the host device (1).

3. The portable 0.4 kV low voltage equipment contact fault monitoring and early warning system according to claim 2, characterized in that: The metal probe (3221) is covered with a probe insulating layer (3223) except for the tip contact.

4. The portable 0.4 kV low voltage equipment contact fault monitoring and early warning system according to claim 3, characterized in that: An elastic buffer structure (3224) is provided between the probe tip (322) and the metal shaping hose (321), allowing the metal probe (3221) to move elastically along the axial direction.

5. The portable 0.4 kV low voltage equipment contact fault monitoring and warning system according to claim 4, characterized in that: The elastic buffer structure (3224) includes an outer shell (301), a retaining ring (302), a spring (303), and an insulating connection (304). The outer shell (301) is connected to the end of the metal shaping hose (321) through the insulating connection (304). A retaining ring (302) is provided between the outer shell (301) and the metal shaping hose (321). One end of the probe end (322) protrudes out of the outer shell (301), and the other end of the probe end (322) is slidably installed inside the outer shell (301). A spring (303) is provided inside the outer shell (301), and the two ends of the spring (303) are respectively pressed against the probe end (322) and the retaining ring (302).

6. The portable 0.4 kV low voltage equipment contact fault monitoring and warning system according to claim 2, characterized in that: The metal-shaped flexible hose (321) is a plastic-coated metal flexible hose, with an inner metal shaping layer and an outer insulating plastic layer.

7. The portable 0.4 kV low voltage equipment contact fault monitoring and warning system according to claim 1, characterized in that: The device fixing component (2) is one of the following: magnetic base, snap-fit ​​structure, bolt connection structure or hook structure.

8. The portable 0.4 kV low voltage equipment contact fault monitoring and warning system of claim 1, wherein: The device host (1) is equipped with a power module, an intelligent control unit and a wireless communication module connected to the power module. The power module includes a battery unit and / or a power conversion unit that draws power from a 0.4 kV line.

Images