An online monitoring device for multi-point detection of insulation state of a switch cabinet

Abstract

The utility model discloses a kind of online monitoring device for switchgear insulation state multipoint detection, including host computer and sampling pipeline, host computer includes shell, circuit board, vacuum pump and sensor module, circuit board is electrically connected with vacuum pump and sensor module and is all arranged in shell, electromagnetic valve control interface, gas enrichment module control interface, 4G antenna, touch screen and button are arranged on shell lateral wall with circuit board electrically connected, the air inlet end of vacuum pump is communicated with air inlet by sensor module, the air outlet end of vacuum pump is communicated with exhaust port;Sampling pipeline includes gas enrichment module, plastic hose and electromagnetic valve;The application is switched automatically by gas path stop valve switch, realizes switchgear internal multipoint gas collection and measurement, different kinds of gas sensors are used to carry out online monitoring to the volatile organic or inorganic gas generated, after adsorption concentration to gas by gas enrichment module, desorption detection is carried out, improve the sensitivity and detection limit of gas.

Description

Technical Field

[0001] This utility model relates to the field of gas detection equipment technology, and in particular to an online monitoring device for multi-point detection of insulation status of switchgear. Background Technology

[0002] Currently, the main principles of methods applied to insulation fault monitoring in switchgear are based on electrical quantity monitoring. This involves monitoring the changes in sound, light, electromagnetic waves, current, voltage, and temperature generated by partial discharge when an insulation fault occurs, thereby indirectly predicting whether an insulation fault will occur. The main monitoring methods include temperature measurement, pulse current measurement, ultra-high frequency measurement, transient ground voltage measurement, ultrasonic detection, and optical detection.

[0003] The methods described above can detect partial discharge to some extent, but the occurrence of partial discharge does not necessarily mean that the insulation components will be damaged in the short term. Current monitoring methods for switchgear often fail to accurately assess the severity of insulation damage and the location of partial discharge when it is detected, sometimes even increasing unnecessary maintenance workload. In reality, most older switchgear in operation has some degree of insulation damage, yet it can still operate safely for many years. In such cases, conventional electrical quantity monitoring methods, which cannot directly reflect the true insulation state of the switchgear's internal insulation materials, often cause difficulties for maintenance personnel in assessing the switchgear's insulation condition. Therefore, it is necessary to develop an online monitoring device that can directly reflect the insulation state of the switchgear and perform fault location. Utility Model Content

[0004] The technical problem to be solved by this utility model is to address the issues of existing monitoring methods for monitoring the insulation status of switchgear, such as gas detection limits, inaccurate insulation status determination, and difficulty in locating insulation faults.

[0005] To solve the above-mentioned technical problems, the present invention provides a technical solution: an online monitoring device for multi-point detection of insulation status of switchgear, comprising a host and a sampling pipeline, characterized in that: the host includes a housing, a circuit board, a vacuum pump and a sensor module, the circuit board is electrically connected to the vacuum pump and the sensor module and is disposed in the housing, the side wall of the housing is provided with a solenoid valve control interface, a gas enrichment module control interface, a 4G antenna, a touch screen and buttons electrically connected to the circuit board, the air inlet of the vacuum pump is connected to the air inlet through the sensor module, and the air outlet of the vacuum pump is connected to the air outlet; The sampling pipeline includes a gas enrichment module, a plastic hose, and a solenoid valve. One end of the plastic hose is connected to the air inlet through the gas enrichment module, and the other end of the plastic hose is connected to the outlet of at least two solenoid valves through a tee. A gas filter box is provided at the inlet of the solenoid valve.

[0006] Furthermore, the sensor module includes a first sensor module, a second sensor module, and a third sensor module, which are connected end-to-end via connecting pipelines.

[0007] Furthermore, the gas enrichment module includes a cooling fan, a heat sink, a semiconductor cooling chip, an adsorption tube, a thermocouple, and a sealing cover. The adsorption tube and the thermocouple are disposed inside the sealing cover, and the adsorption tube is connected in series with a plastic hose. The semiconductor cooling chip, the heat sink, and the cooling fan are sequentially covered on the sealing cover.

[0008] Furthermore, the adsorption tube is filled with a porous polymer and a carbon-based adsorbent in a 1:1 volume ratio in segments.

[0009] Furthermore, the internal connecting lines, plastic hoses, tees, and gas filter boxes of the sampling pipeline are made of inert Teflon material.

[0010] Furthermore, a waterproof and breathable membrane is installed inside the gas filter box.

[0011] Furthermore, the vacuum pump is a programmable flow-controlled vacuum pump.

[0012] Furthermore, the sensors inside the first, second, and third sensor modules are selected according to the type of target gas to be detected.

[0013] Furthermore, the housing includes a lower cover and an upper cover, which are detachably connected by studs and used to fix the circuit board.

[0014] The beneficial effects of this utility model are as follows: 1. This application employs different types of gas sensors to monitor volatile organic or inorganic gases generated during the insulation degradation process of insulating materials inside the switchgear online. A solenoid valve is used to connect gas filter boxes located at different positions to the main unit. The gas is concentrated through adsorption by a gas enrichment module followed by thermal desorption detection, improving gas sensitivity and detection limits. This enables ppb-level detection and allows for multi-point gas collection and measurement inside the switchgear, facilitating subsequent analysis of gas concentration data at different test points within the switchgear. This enables accurate assessment of the insulation status of insulating materials at different points inside the switchgear.

[0015] 2. In this application, the gas flows sequentially through the first sensor module, the second sensor module, and the third sensor module via an internal connecting pipeline. Since the three sensors are different and can be replaced according to the usage, it is convenient to detect the concentration of specific types of gas in real time.

[0016] 3. In this application, the gas enrichment module is cooled by a semiconductor refrigeration chip and its temperature is collected by a thermocouple to control the temperature. This temperature control facilitates sample adsorption at low temperatures and sample desorption at high temperatures, thus achieving the sample enrichment process and enabling the detection limit to reach the ppb level. At the same time, the gas enrichment module is filled with a porous polymer and a carbon-based adsorbent in a 1:1 volume ratio in a segmented manner to improve the enrichment effect of volatile organic compounds.

[0017] 4. The gas filter box in this application is equipped with a filter membrane, which can filter particulate matter in the gas and prevent gas path blockage caused by long-term operation.

[0018] To make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only four of the drawings in this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a schematic diagram of the overall assembly of the main unit.

[0021] Figure 3 This is a schematic diagram of the internal structure of the host computer. Figure 4 This is a schematic diagram of the gas enrichment module.

[0022] In the diagram, 1-Solenoid valve control interface, 2-Gas enrichment module control interface, 3-Plastic hose, 4-T-way valve, 5-Solenoid valve, 6-Gas filter box, 7-Gas enrichment module, 8-Air inlet, 9-4G antenna, 10-Lower cover of main unit, 11-Circuit board, 12-Stabilizer, 13-Touch screen, 14-Button, 15-Upper cover of main unit, 16-Power interface, 17-Exhaust port, 18-First sensor module, 19-Second sensor module, 20-Third sensor module, 21-Vacuum pump, 22-Cooling fan, 23-Heat sink, 24-Semiconductor cooling chip, 25-Adsorption tube, 26-Thermocouple, 27-Sealing cover. Detailed Implementation

[0023] Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0024] It should be understood that the steps described in the method embodiments of this utility model may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of this utility model is not limited in this respect.

[0025] The names of the messages or information exchanged between the multiple devices in this embodiment of the invention are for illustrative purposes only and are not intended to limit the scope of these messages or information. Example 1

[0026] like Figure 1-4 As shown, an online monitoring device for multi-point detection of insulation status in switchgear includes a main unit and sampling pipelines. The main unit includes a housing, a circuit board 11, a vacuum pump 21, and a sensor module. The circuit board 11 is electrically connected to the vacuum pump 21 and the sensor module and is housed within the housing. The side wall of the housing is provided with a solenoid valve control interface 1, a gas enrichment module control interface 2, a 4G antenna 9, a touch screen 13, buttons 14, and a power interface 16, all electrically connected to the circuit board 11. The inlet of the vacuum pump 21 is connected to the inlet port 8 via the sensor module, and the outlet of the vacuum pump 21 is connected to the exhaust port 17. This application can perform offline or online monitoring, and the collected data can be displayed on the touch screen 13 and uploaded to a designated server for storage in a database via the 4G antenna 9.

[0027] The sampling pipeline includes a gas enrichment module 7, a plastic hose 3, and a solenoid valve 5. One end of the plastic hose 3 is connected to the air inlet 8 through the gas enrichment module 7, and the other end of the plastic hose 3 is connected to the outlet of at least two solenoid valves 5 through a tee 4. A gas filter box 6 is provided at the inlet of the solenoid valve 5. The main unit is electrically connected to and controls each solenoid valve 5 through the solenoid valve control interface 1. By switching the solenoid valves 5 on and off, the main unit can connect to the gas filter boxes 6 placed in different positions, thereby achieving the collection of gas from multiple locations.

[0028] The housing includes a lower cover 10 and an upper cover 15. The lower cover 10 and the upper cover 15 are detachably connected by studs 12 and the circuit board 11 is fixed by the studs 12, thereby fixing the circuit board 11 to the housing.

[0029] The sensor module includes a first sensor module 18, a second sensor module 19, and a third sensor module 20, which are connected end-to-end via connecting pipelines. The sensors inside the first sensor module 18, the second sensor module 19, and the third sensor module 20 are selected according to the type of target gas to be detected, such as infrared sensors, semiconductor sensors, and electrochemical sensors, to achieve simultaneous online monitoring of multiple points and multiple characteristic gases.

[0030] When insulation defects occur in switchgear and cable lines, the insulating materials undergo complex chemical reactions under electron collisions and high temperatures, producing specific gaseous components. These mainly include organic and inorganic small molecules, heterocyclic substances, ketones, esters, aldehydes, halogenated hydrocarbons, benzene compounds, alkanes and alkenes, and chain and cyclic silicon oxides. By monitoring the concentration and variation patterns of the characteristic gases produced by the decomposition of insulating materials, the internal insulation status of the equipment can be determined. For example, some concentration ranges can be pre-set, each representing a different insulation status. By comparing the detected value with the set concentration range, it can be determined which range the concentration value falls into, thus obtaining the corresponding insulation status. Based on the sampling location of the detected gas, the insulation status and the severity and location of the insulation material damage can be accurately assessed, providing early warning of insulation faults. This compensates for the shortcomings of existing insulation monitoring equipment and can greatly reduce missed and false alarms during insulation monitoring.

[0031] The gas enrichment module 7 includes a cooling fan 22, a heat sink 23, a semiconductor cooling chip 24, an adsorption tube 25, a thermocouple 26, and a sealing cover 27. The adsorption tube 25 and the thermocouple 26 are disposed inside the sealing cover 27, and the adsorption tube is connected in series with the plastic hose 3. The semiconductor cooling chip 24, the heat sink 23, and the cooling fan 22 are sequentially placed on the sealing cover 27. The gas is adsorbed and concentrated by the gas enrichment module and then thermally desorbed for detection, which improves the sensitivity and detection limit of the gas, and can achieve ppb-level detection.

[0032] The host unit is electrically connected to and controlled via the gas enrichment module control interface 2. The adsorption tube 25 can be rapidly heated by current through resistance matching, and is cooled by a semiconductor cooling chip 24. Temperature values ​​are collected and controlled by a thermocouple 26. Sample adsorption is performed at a low temperature of -10℃ with a sampling volume of 100ml, and sample desorption is performed at a high temperature of 280℃ to achieve the sample enrichment process and bring the detection limit down to the ppb level.

[0033] The sampling pipeline, including the internal connecting lines of the main unit, the plastic hose 3, the tee 4, and the gas filter box 6, is made of inert Teflon material to reduce its adsorption of the target gas; the vacuum pump 21 is a programmable flow control vacuum pump to control the sampling flow rate. Example 2

[0034] This embodiment is obtained by adding technical features such as porous polymer and carbon-based adsorbent based on embodiment one. The remaining technical features are the same as those in embodiment one, and the similarities will not be repeated here. The difference between this embodiment and embodiment one is that the adsorption tube 25 is filled with porous polymer and carbon-based adsorbent in a 1:1 volume ratio in segments.

[0035] In this embodiment, the specific filling position and interval are set according to actual needs, so as to facilitate the thermal desorption detection after adsorption and concentration of gas. The specific details will not be elaborated here, in order to improve the enrichment effect of volatile organic compounds. Example 3

[0036] This embodiment is obtained by adding technical features such as a waterproof and breathable membrane based on embodiment two. The remaining technical features are the same as those in embodiment one, and the similarities will not be repeated here. The difference between this embodiment and embodiment one is that a waterproof and breathable membrane is installed inside the gas filter box 6.

[0037] In this embodiment, the waterproof and breathable membrane can be installed at the outlet of the gas filter box 6. The filter device in the gas filter box 6 can filter particulate matter in the gas, prevent long-term operation from causing gas path blockage, and reduce the adsorption and condensation of the target gas by the pipeline.

[0038] It should be noted that the vacuum pump 21 (model FUJ-PCV), gas detector (model AS8800, etc.) and solenoid valve 5 (model ZCT) involved in this application all adopt existing technology, and the above-mentioned components are electrically connected to the microcontroller (model TC-SCR), and the control circuit between the microcontroller and each component is existing technology.

[0039] The overall technical solution formed by the above embodiments works as follows: In practical applications, this application allows multiple sampling pipelines to be arranged in different compartments of the switchgear, such as in the instrument room, cable room, and busbar room. Alternatively, sampling points can be placed at different locations inside a key monitoring compartment based on the key insulation monitoring area within the switchgear, in order to achieve insulation fault monitoring and fault location.

[0040] When vacuum pump 21 is working, and the host controls a certain solenoid valve 5 to open, the gas filter box 6 corresponding to the solenoid valve 5 is connected to vacuum pump 21 through plastic hose 3. Under the negative pressure of vacuum pump 5, air at solenoid valve 5 enters gas filter box 6, and then enters first sensor module 18, second sensor module 19 and third sensor module 20 in sequence after passing through solenoid valve 5, plastic hose 3, gas enrichment module 7, and air inlet 8. The sensors in the sensor modules monitor the concentration of substances in the flowing gas. The detected gas is discharged from exhaust port 17. After closing solenoid valve 5, another solenoid valve 5 is opened. Solenoid valves 5 are opened and closed in a cycle to obtain gas concentration data at different test points inside the switch cabinet.

[0041] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An online monitoring device for multi-point detection of insulation status in switchgear, comprising a main unit and sampling pipelines, characterized in that: The host includes a housing, a circuit board (11), a vacuum pump (21), and a sensor module. The circuit board (11) is electrically connected to the vacuum pump (21) and the sensor module and is disposed in the housing. The side wall of the housing is provided with a solenoid valve control interface (1), a gas enrichment module control interface (2), a 4G antenna (9), a touch screen (13), and buttons (14) that are electrically connected to the circuit board (11). The air inlet of the vacuum pump (21) is connected to the air inlet (8) provided on the housing through the sensor module, and the air outlet of the vacuum pump (21) is connected to the exhaust port (17) provided on the housing. The sampling pipeline includes a gas enrichment module (7), a plastic hose (3) and a solenoid valve (5). One end of the plastic hose (3) is connected to the air inlet (8) through the gas enrichment module (7), and the other end of the plastic hose (3) is connected to the outlet of at least two solenoid valves (5) through a tee (4). A gas filter box (6) is provided at the inlet of the solenoid valve (5).

2. The online monitoring device for multi-point detection of insulation status in switchgear according to claim 1, characterized in that: The sensor module includes a first sensor module (18), a second sensor module (19), and a third sensor module (20), which are connected end to end in sequence through connecting pipelines.

3. The online monitoring device for multi-point detection of insulation status in switchgear according to claim 1, characterized in that: The gas enrichment module (7) includes a cooling fan (22), a heat sink (23), a semiconductor cooling chip (24), an adsorption tube (25), a thermocouple (26), and a sealing cover (27). The adsorption tube (25) and the thermocouple (26) are arranged inside the sealing cover (27), and the adsorption tube is connected in series with the plastic hose (3). The semiconductor cooling chip (24), the heat sink (23), and the cooling fan (22) are sequentially covered on the sealing cover (27).

4. The online monitoring device for multi-point detection of insulation status in switchgear according to claim 3, characterized in that: The adsorption tube (25) is filled with a porous polymer and a carbon-based adsorbent in a 1:1 volume ratio for segmented filling.

5. The online monitoring device for multi-point detection of insulation status in switchgear according to claim 1, characterized in that: The sampling pipeline, including the internal connecting lines of the main unit, plastic hose (3), tee (4), and gas filter box (6), is made of inert Teflon material.

6. The online monitoring device for multi-point detection of insulation status in switchgear according to claim 1, characterized in that: The gas filter box (6) is equipped with a waterproof and breathable membrane.

7. The online monitoring device for multi-point detection of insulation status in switchgear according to claim 1, characterized in that: The vacuum pump (21) is a programmable flow control vacuum pump.

8. An online monitoring device for multi-point detection of insulation status in switchgear according to claim 2, characterized in that: The sensors inside the first sensor module (18), the second sensor module (19), and the third sensor module (20) are selected according to the type of target gas to be detected.

9. An online monitoring device for multi-point detection of insulation status in switchgear according to claim 1, characterized in that: The housing includes a lower cover (10) and an upper cover (15), which are detachably connected by studs (12) and the circuit board (11) is fixed by studs (12).

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