Magnetic type partial discharge detection box

Abstract

The utility model relates to the technical field of power equipment monitoring, in particular to a magnetic type partial discharge detection box. The device is formed by fixedly connecting an upper shell and a lower shell, and a strong magnet module and a sensor module are integrated in a functional partition in the lower shell. The strong magnet module comprises a main magnet module, a first auxiliary magnet module and a second auxiliary magnet module, the main magnet module is fixedly installed on the uppermost portion of the function zone, and the first auxiliary magnet module and the second auxiliary magnet module are symmetrically arranged on the two sides of the lower portion of the function zone. The sensor module comprises an ultrasonic focusing cavity, an ultrahigh frequency sensing area, a transient earth electricity and temperature integration area, an ozone sensing area and the like, and can realize multi-signal monitoring of sound waves, transient earth, ultrahigh frequency, temperature rise, ozone and the like. According to the utility model, the strong magnet module forms a triangular magnetic attraction structure and can be quickly attracted to a metal electric cabinet, meanwhile, the multi-sensor fusion technology realizes all-directional holographic monitoring of partial discharge signals of power equipment, and the operation is flexible and the adaptability is strong.

Description

TECHNICAL FIELD

[0001] The utility model relates to power equipment monitoring technical field, concretely relates to a magnetic partial discharge detection box. BACKGROUND

[0002] In the operation of power system, the switch cabinet as important distribution network node, its operation state directly influences the reliability of power supply. Partial discharge is the early sign of switch cabinet insulation deterioration, if not timely monitoring and processing, can cause serious insulation fault, lead to power failure accident. With the continuous development of power system, the requirement of power supply reliability is increasing, any power failure accident can bring huge loss to society and economy.

[0003] The current partial discharge detection equipment has obvious limitation in installation mode and monitoring capacity. On the one hand, the traditional detection device adopts bolt fixation or handheld inspection mode, the former needs to use additional tools in the field installation, and the operation is cumbersome and difficult to adjust the position quickly, and the latter is limited by the range and efficiency of artificial inspection, and cannot realize long-term stable monitoring. On the other hand, the detection mode of single sensor can only obtain a certain type of signal of partial discharge, and it is difficult to fully reflect the discharge characteristics, which leads to deviation in the judgment of equipment fault, and cannot meet the demand of holographic monitoring of power equipment. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a magnetic partial discharge detection box to solve the problems of traditional partial discharge detection device that the operation is cumbersome and difficult to adjust the position quickly during installation, and the single detection mode is difficult to fully reflect the discharge characteristics.

[0005] In order to achieve the above purpose, a magnetic partial discharge detection box is provided, which comprises an upper shell and a lower shell, the lower shell is internally provided with a functional partition, the functional partition is integrated with a strong magnet module and a sensor module, wherein:

[0006] The strong magnet module comprises a main magnet module, a first auxiliary magnet module and a second auxiliary magnet module, the main magnet module is fixedly installed at the uppermost of the functional partition, and the first auxiliary magnet module and the second auxiliary magnet module are symmetrically arranged on the lower sides of the functional partition.

[0007] In the above technical scheme, the strong magnet module is refined into the main magnet module, the first auxiliary magnet module and the second auxiliary magnet module, which are distributed in a triangular shape, the main magnet module is placed at the uppermost of the functional partition, and the two auxiliary magnet modules are symmetrically distributed on the lower sides, so that when the detection box is attached to the surface of the metal cabinet such as switch cabinet, the stable magnetic attraction force is formed by means of the triangular stable structure characteristics, which is convenient and fast to adsorb and install without additional tools, flexible and stable, improves the installation convenience and adsorption reliability.

[0008] On this basis, the sensor module includes an ultrasonic focusing cavity and a UHF sensing area. The ultrasonic focusing cavity is arranged on one side below the main magnet module. An acoustic-electric coupling hole is opened below the ultrasonic focusing cavity and passes through the lower shell. The acoustic-electric coupling hole is connected to the ultrasonic focusing cavity, and the UHF sensing area is arranged on the side of the acoustic-electric coupling hole.

[0009] In this technical solution, the ultrasonic focusing cavity focuses and enhances the ultrasonic signal generated by local discharge through a specific cavity structure. Combined with the acoustic-electric coupling hole at the bottom, it can directly transmit the acoustic wave signal to the inside of the detection box, reducing the attenuation of the signal during propagation and improving the acquisition sensitivity of the ultrasonic signal. The ultra-high frequency sensing area is set close to the acoustic-electric coupling hole, which can synchronously capture the ultra-high frequency electromagnetic wave signal generated by local discharge, forming a dual monitoring system of acoustic waves and electromagnetic waves, so that the two sensors form complementary monitoring areas in space.

[0010] In another technical solution, a transient voltage sensor and a temperature sensor are provided in the transient electrical and temperature integrated area, and metal sheets are respectively attached to the bottom of the transient voltage sensor and the temperature sensor. The bottom surfaces of the two metal sheets are exposed to the outside of the lower shell and protrude from the plane of the lower shell.

[0011] In this technical solution, the transient ground voltage sensor forms direct electrical contact with the metal surface of the device under test through a metal sheet. The metal sheet's conductivity enhances the conduction efficiency of the transient ground voltage signal, preventing signal attenuation due to air gaps. The metal sheet protrudes from the lower housing plane, ensuring that when the test box is attached to the device surface, the metal sheet adheres closely to the surface, improving contact stability while reducing signal interference from the lower housing material. The integrated temperature sensor and transient ground voltage sensor simultaneously monitor temperature changes associated with partial discharges. Because partial discharges often cause localized temperature rises in equipment, collaborative analysis of their data can determine the presence of discharge and assess its severity in conjunction with temperature rises, enabling multi-dimensional monitoring of the power equipment's status and providing a more comprehensive basis for fault warning.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. In this magnetic partial discharge detection box, the main magnet module is located at the top of the functional area, and the two auxiliary magnet modules are symmetrically arranged on both sides below, forming a stable triangular magnetic structure. The geometric stability of the triangle allows the detection box to be adapted to the metal electrical control box for rapid adsorption and installation without the need for additional fixing tools such as bolts and clamps. The adsorption position can be quickly adjusted during on-site testing, enhancing operational flexibility. The handheld inspection device can also be removed, making it a dual-purpose device.

[0014] 2、The magnetic partial discharge detection box, integrated with five sensors of sound wave, transient ground, ultra-high frequency, pulse current, ozone and temperature rise, through multi-sensor fusion technology, can realize all-around sensing of partial discharge signals of power equipment, can not only obtain basic information such as amplitude and phase of partial discharge, but also can deeply analyze spectral characteristics and waveform changes of signals, and truly realize holographic monitoring. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structure schematic view of the bottom of the utility model;

[0016] Figure 2 It is a structure schematic view of the top of the utility model;

[0017] Figure 3 It is a structure schematic view of the inside of the lower shell of the utility model;

[0018] Figure 4 It is a structure schematic view of the top of the upper shell of the utility model;

[0019] Figure 5 It is a structure schematic view of the top of the lower shell of the utility model.

[0020] The meanings of various signs in the drawing are as follows:

[0021] 1, the upper shell; 11, the display screen; 12, the button; 13, the ozone sampling hole; 14, the communication interface; 15, the charging interface; 2, the lower shell; 211, the positioning plate; 212, the mounting hole; 22, the fixed column; 23, the function partition; 231, the main magnet module; 232, the battery compartment; 233, the ultrasonic focusing cavity; 234, the ultra-high frequency sensing area; 235, the sound-electricity coupling hole; 236, the first auxiliary magnet module; 237, the second auxiliary magnet module; 238, the transient ground and temperature integrated area; 239, the ozone sensing area. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0023] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is the orientation or positional relationship shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0024] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise explicitly specified.

[0025] The embodiment aims to provide a magnetic partial discharge detection box, which comprises an upper shell 1 and a lower shell 2. Figures 1-3 As shown in the figure, the detection box is aligned with the upper shell 1 through the positioning plates 211 arranged on the four sides of the lower shell 2, and is assembled through the mounting holes 212 and screws, so that the overall structure is compact and convenient to disassemble and maintain. Figure 4 As shown in the figure, the upper shell 1 is provided with a display screen 11 and a plurality of buttons 12 at the top, wherein the display screen 11 adopts a high-brightness liquid crystal screen, can display the amplitude, phase, spectral characteristics and device temperature of the partial discharge signal in real time, and the buttons 12 include power switch, mode switching, data query, alarm threshold setting and other function keys, so as to facilitate the intuitive operation of the device by the operator. Figure 1 and Figure 2 As shown in the figure, the left side of the upper shell 1 is provided with a charging interface 15, the bottom of the upper shell 1 is provided with a plurality of ozone sampling holes 13 arranged in an array, and the right side of the ozone sampling hole 13 is provided with a communication interface 14. The ozone sampling hole 13 can make the external air enter the ozone sensing area 239, the communication interface 14 supports USB (not shown in the figure) or wireless transmission protocol, can transmit the monitoring data to the background system, and the charging interface 15 is electrically connected with the battery compartment 232 in the lower shell 2, and is used for charging the built-in battery in the battery compartment 232.

[0026] As shown in the figure, Figure 5As shown, the inside of the lower shell 2 is modularly integrated by a functional partition 23, a strong magnet module is arranged in the functional partition 23, the strong magnet module includes a main magnet module 231, a first auxiliary magnet module 236 and a second auxiliary magnet module 237, the main magnet module 231 is fixedly installed at the uppermost of the functional partition 23, the first auxiliary magnet module 236 and the second auxiliary magnet module 237 are symmetrically arranged at the lower sides of the functional partition 23, and the three form a triangular magnetic attraction structure. When the detection box is close to the surface of the metal electric cabinet, the triangular structure generates uniform and strong magnetic attraction force by geometric stability, which can be quickly adsorbed and fixed without bolts, clamps and other tools, and the adsorption angle can be changed by manual adjustment to meet the installation requirements of different monitoring points. At the same time, the structure supports quick disassembly of the detection box, which is convenient for handheld inspection or transfer to other equipment.

[0027] The sensor module is integrated below the circuit board, the circuit board is fixedly installed in the lower shell 2 by the fixing column 22, different sensors are arranged at different positions to correspond to different functional areas, and multi-signal cooperative monitoring is realized. Figure 5 As shown, an ultrasonic focusing cavity 233 is arranged at one side below the main magnet module 231, an acoustic-electric coupling hole 235 penetrating through the lower shell 2 is formed below the ultrasonic focusing cavity 233, the acoustic-electric coupling hole 235 is in communication with the ultrasonic focusing cavity 233, and a very high frequency sensing area 234 is arranged at the side. The ultrasonic signal generated by partial discharge enters the ultrasonic focusing cavity 233 through the acoustic-electric coupling hole 235, the arc-shaped inner wall of the cavity reflects and focuses the sound wave, enhances the signal strength and reduces the attenuation, and the focused sound wave is converted into an electric signal by the sensor in the cavity; the very high frequency sensing area 234 adopts a microstrip antenna structure, which can capture electromagnetic wave signals in the 300MHz-3GHz frequency band generated during discharge, and the two form complementary monitoring areas in space, synchronously acquire sound wave and electromagnetic wave signals, and improve the discharge positioning accuracy.

[0028] The transient ground voltage and temperature integrated area 238 is located between the first auxiliary magnet module 236 and the second auxiliary magnet module 237, and a transient ground voltage sensor and a temperature sensor are arranged inside, the bottoms of the two are attached to a metal sheet, and the bottom surface of the metal sheet is exposed to the outside of the lower shell 2 and protrudes from the plane. When the detection box is adsorbed on the surface of the equipment, the metal sheet is preferentially in close contact with the metal shell of the equipment, the transient ground voltage sensor conducts the transient voltage pulse on the surface of the equipment through the metal sheet, avoiding signal attenuation caused by air gap; the temperature sensor senses the local temperature rise of the equipment in real time through the metal sheet, and the data of the two is synchronously transmitted to the circuit board for analysis, and the discharge severity can be evaluated according to the temperature rise amplitude.

[0029] It should be noted that the metal sheet adopts a thin high-conductive material (thickness ≤0.5 mm), under the action of the strong magnetic field generated by the first auxiliary magnet module 236 and the second auxiliary magnet module 237, the convex part thereof preferentially contacts the equipment surface and elastically deforms controllably, the deformation amount accurately compensates the initial convex height, and the final detection device is ensured to be rigidly and tightly attached to the equipment surface; this process actively eliminates the effects of assembly tolerances and surface unevenness through the micro-yield deformation of the metal sheet, while ensuring that the metal sheet is in close contact with the equipment surface, the adsorption force of the first auxiliary magnet module 236 and the second auxiliary magnet module 237 on the equipment surface is also stable.

[0030] The ozone sensing area 239 is arranged below the transient ground and temperature integrated area 238 and corresponds to the ozone sampling hole 13 of the upper shell 1. Partial discharge can ionize oxygen in the air to generate ozone, and the ozone enters the sensing area through the ozone sampling hole 13, and the ozone sensor detects the change of ozone concentration based on the electrochemical principle, and in combination with other sensor data, can assist in judging the duration and intensity of the discharge, and provide additional basis for fault warning.

[0031] Working principle: when the detection box is adsorbed on the power cabinet, the triangular magnetic attraction structure ensures that each sensing unit is tightly attached. The ultrasonic wave generated by the partial discharge is focused and enhanced through the ultrasonic focusing cavity 233, and then converted into an electric signal through the acoustic-electric coupling hole 235, at the same time, the very high frequency sensing area 234 captures electromagnetic pulses, the transient ground voltage sensor extracts the conduction current, the temperature sensor monitors the temperature rise, and the ozone sensor analyzes the gas composition. All signals are processed synchronously by the microcontroller on the circuit board, and holographic diagnosis is realized through multi-stage analysis: first, the signals are aligned, and different physical signals are accurately matched in time domain; second, the characteristic parameters are extracted, and the time characteristics and spatial relationship of the signals are analyzed; finally, through the pattern recognition algorithm, the temperature trend and the change of ozone concentration are combined to distinguish different types of discharge phenomena. The system automatically triggers the graded alarm mechanism according to the preset logic.

[0032] The basic principle, main features and advantages of the utility model are shown and described above. Those skilled in the art should understand that the utility model is not limited by the above examples, and the above examples and descriptions in the specification are only preferred examples of the utility model and are not intended to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model can also have various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A magnetic partial discharge detection box, comprising an upper shell (1) and a lower shell (2), characterized in that: A functional partition (23) is provided inside the lower housing (2), and the functional partition (23) is integrated with a strong magnet module and a sensor module, wherein: The strong magnet module comprises a main magnet module (231), a first auxiliary magnet module (236) and a second auxiliary magnet module (237), wherein the main magnet module (231) is fixedly mounted at the top of the functional partition (23), and the first auxiliary magnet module (236) and the second auxiliary magnet module (237) are symmetrically arranged on both sides below the functional partition (23); The sensor module further comprises a transient ground electrical and temperature integration region (238), wherein the transient ground electrical and temperature integration region (238) is located between the first auxiliary magnet module (236) and the second auxiliary magnet module (237); A transient voltage sensor and a temperature sensor are provided in the transient ground electricity and temperature integration area (238), and metal sheets are respectively provided on the bottoms of the transient ground voltage sensor and the temperature sensor, and the bottom surfaces of the two metal sheets are exposed to the outside of the lower shell (2) and protrude from the plane of the lower shell (2).

2. The magnetic partial discharge detection box according to claim 1, characterized in that: The sensor module comprises an ultrasonic focusing cavity (233) and an ultra-high frequency sensing area (234); the ultrasonic focusing cavity (233) is arranged on one side below the main magnet module (231); an acoustic-electric coupling hole (235) penetrating the lower shell (2) is provided below the ultrasonic focusing cavity (233); the acoustic-electric coupling hole (235) is communicated with the ultrasonic focusing cavity (233); and an ultra-high frequency sensing area (234) is provided on the side of the acoustic-electric coupling hole (235).

3. The magnetic partial discharge detection box according to claim 1, characterized in that: An ozone sensing area (239) is provided below the transient geoelectric and temperature integration area (238), and an ozone sampling hole (13) is provided at the bottom of the upper shell (1). A plurality of ozone sampling holes (13) are provided and distributed in an array.

4. The magnetic partial discharge detection box according to claim 2, characterized in that: A battery compartment (232) is further provided on the other side below the main magnet module (231), and a charging interface (15) is provided on one side of the upper shell (1), wherein the charging interface (15) is electrically connected to the battery inside the battery compartment (232).

5. The magnetic partial discharge detection box according to claim 1, characterized in that: A plurality of fixing columns (22) are fixedly connected inside the lower shell (2), the sensor module is integrated below the circuit board, and the lower shell (2) is fixedly connected to the circuit board via the fixing columns (22).

6. The magnetic partial discharge detection box according to claim 3, characterized in that: A communication interface (14) is provided on one side of the ozone sampling hole (13), and the communication interface (14) is electrically connected to the circuit board.

7. The magnetic partial discharge detection box according to claim 1, characterized in that: The upper housing (1) is also provided with a display screen (11) and multiple groups of buttons (12).

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