CN112946438A - Modularized wireless partial discharge detection device - Google Patents
Modularized wireless partial discharge detection device Download PDFInfo
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- CN112946438A CN112946438A CN202110274209.7A CN202110274209A CN112946438A CN 112946438 A CN112946438 A CN 112946438A CN 202110274209 A CN202110274209 A CN 202110274209A CN 112946438 A CN112946438 A CN 112946438A
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- partial discharge
- processing circuit
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- signal processing
- wireless transmission
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- Testing Relating To Insulation (AREA)
Abstract
The invention provides a modularized wireless partial discharge detection device, which can modularize, detect partial discharge in electrical equipment, wirelessly transmit detection data, and has good flexibility and strong controllability. The device comprises a partial discharge detection sensor, a signal processing circuit and a wireless transmission module, wherein one end of the partial discharge detection sensor is connected with the signal processing circuit through an anti-interference shielding cable, the partial discharge detection sensor is coupled to an electrical equipment grounding lead, and the signal processing circuit is connected with the wireless transmission module. Through the combination of the partial discharge sensor, the processing circuit and the wireless transmission module, partial discharge can be detected, discharge waveforms can be processed, processed results can be transmitted out through the wireless transmission module, and the detection device is more convenient and flexible to use compared with the traditional detection device.
Description
Technical Field
The invention relates to the technical field of discharge monitoring, in particular to a modularized wireless partial discharge detection device.
Background
With the rapid development of economy and continuous progress of the power industry in China, more energy is put into the country for the construction of urban and rural power grids, so that the power grids are intelligentized and modernized, and the power supply reliability and the power supply quality are improved. Therefore, the electrical equipment used in the power grid is required to be updated and higher, the functional configuration of the electrical equipment is required to be more reasonable, the electrical equipment is required to be developed continuously, the intellectualization is finally realized, and in order to effectively improve the reliability of the power supply and distribution network, the power supply system is gradually developed towards the direction of small volume, low price and easy maintenance. Although some electrical equipment at home and abroad realizes the feeder automation function, the overall level of the electrical equipment is not high at present, more electrical equipment still only stays at the common level, and a plurality of equipment still depend on manual operation, thereby causing great obstacle to the integration into a distribution network automation system. Regarding the partial discharge detection function, most electrical equipment manufacturers pay no attention and stay in the primary stage. Meanwhile, the existing partial discharge detection scheme has the problems of single signal, difficult power supply and complex wiring of the detection device and incapability of realizing all-dimensional monitoring of electrical equipment, and the partial discharge detection scheme does not really begin to be developed.
Therefore, a modularized wireless partial discharge detection device is provided to solve the problems in the prior art.
Disclosure of Invention
The present invention is directed to solving the above problems by providing a modular wireless partial discharge detector.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention provides a modularized wireless partial discharge detection device which can modularize, detect partial discharge in electrical equipment, wirelessly transmit detection data, and has good flexibility and strong controllability. The device comprises a partial discharge detection sensor, a signal processing circuit and a wireless transmission module, wherein one end of the partial discharge detection sensor is connected with the signal processing circuit through a shielded cable, the partial discharge detection sensor is coupled to an electrical equipment grounding lead, and the signal processing circuit is connected with the wireless transmission module.
As a preferred technical scheme of the invention, the outer shell of the partial discharge detection sensor is of a hollow oval structure, and the outer shell is made of an anti-interference shielding material.
As a preferred technical solution of the present invention, the amplification module, the detection module, the integration module, and the controller module in the signal processing circuit are connected in series.
As a preferable technical scheme of the invention, a PCB board which is welded by the signal processing circuit and the wireless transmission module together is provided with a power supply interface.
As a preferred embodiment of the present invention, the entire partial discharge detection sensor is hermetically connected to the outer surface of the ground lead of the electrical device through a sealed tensile fixing sheath, and the sealed tensile fixing sheath is fixedly connected to both ends of the sensor housing through bolts.
The invention has the following beneficial effects:
1. the invention has the advantages of various detectable partial discharge types, easy power supply of the monitoring device and no feeder line, and can realize the omnibearing detection of the electrical equipment. Based on the wireless transmission Zigbee technology, the electrical equipment realizes intellectualization in the aspects of automation and on-line detection, and combines the automation and the on-line detection to create an intelligent, miniaturized, maintenance-free and omnibearing detection electrical equipment system. The sensor based on the Zigbee technology can realize ad hoc network, has high expansibility and can be used when being plugged. The discharge analysis is carried out aiming at different test models, the reference quantity which is not easily influenced by environmental factors is selected, and the situation that the types of partial discharge are more is avoided. The output of the power taking device is stable, the power taking device can work normally and output stably in a large current variation range of the power transmission line, the phenomenon that the power taking device generates heat seriously is avoided, and the power taking device is simple in circuit and low in cost.
2. The electrical equipment monitoring and on-line evaluation system based on wireless data transmission can remotely monitor the operation condition of electrical equipment with multiple points and multiple areas, reduces labor cost, blindness of electrical equipment maintenance and maintenance cost, and improves maintenance efficiency.
According to the invention, a real-time monitoring platform based on LabVIEW is established, and abundant algorithm analysis is carried out in the upper computer, so that the fault analysis speed and efficiency are improved, the fault judgment accuracy is greatly reduced, and the labor cost is reduced.
According to the invention, the local discharge signal is detected by adopting a high-frequency current sensor and transient voltage-to-earth voltage sensor combined monitoring technology, the manufacturing cost is low, the installation is simple and convenient, the maintenance is easy, the working stability is good, the reliability is high, and the cost in the installation process and the operation process is greatly reduced.
Drawings
Fig. 1 is a schematic structural diagram of a modular wireless partial discharge detection device.
Fig. 2 is a schematic diagram of an internal circuit structure of the signal processing module.
Fig. 3 is a schematic circuit diagram of an outer casing of the partial discharge detection sensor.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example 1
Referring to fig. 1, the present embodiment is described, in which a modular wireless partial discharge detection apparatus according to the present embodiment includes a partial discharge detection sensor, a signal processing circuit, and a wireless transmission block, it is characterized in that one end of the partial discharge detection sensor is connected with the shielding cable through an SMA, the other end of the shielding cable is connected with a signal processing circuit, the other end of the signal processing circuit is connected with a wireless transmission module, the partial discharge sensor is coupled with an electrical equipment grounding lead, the signal processing circuit and the wireless transmission module are welded on the PCB together, the signal processing circuit is internally provided with an amplifying module, a detecting module, an integrating module and a controller module, the wireless transmission module is internally provided with a CC2530 chip, a core circuit thereof and a wireless radio frequency module. The purpose of this is: the partial discharge detection sensor is a high-frequency current sensor, the number of turns of the winding of the sensor is 10 turns, the integral resistance is 100 omega, the high-frequency current sensor is manufactured according to the determined number of turns of the winding and the integral resistance, the winding of the sensor is uniform during winding, the interference in a test environment is prevented, an enameled wire coated with insulation on the outside is selected, the enameled wire is divided into a copper enameled wire and an aluminum enameled wire according to the difference of conductive wire cores, because copper has the advantages of good electric conduction and heat conduction, strong mechanical strength, convenient welding and the like, a copper enameled wire is selected to wind the high-frequency current sensor, the diameter of the selected enameled wire is 0.8mm, the copper shielding belt is wound on the wound coil, a gap of about 3mm is formed in the inner ring of the magnetic ring, the actually manufactured high-frequency current sensor has good amplitude-frequency characteristics in a frequency band of 800 kHz-20 MHz, in order to facilitate field testing, the coil is printed with an openable hollow oval shell in a 3D mode.
Example 2
The present embodiment is described with reference to embodiment 1, and in the present embodiment, the amplification module, the detection module, the integration module, and the controller module in the signal processing circuit are provided. The amplitude of the partial discharge signal acquired by the partial discharge sensor is very small, and the signal conditioning is performed after the original signal is amplified. In consideration of the frequency of the partial discharge signal, an OPA657 operational amplifier chip is selected to manufacture an amplification module of the partial discharge signal, the product of the gain bandwidth of the chip is 1.6GHz, and the chip has lower input offset voltage, lower input bias current and lower input voltage noise. The method is suitable for amplifying signals with high frequency and small signal amplitude. The detection principle is used for signal demodulation at first, and a low-frequency carrier signal can be separated from a high-frequency signal by using the detection principle, so that the signal receiving function is realized. The method is commonly applied to conditioning of partial discharge ultrahigh frequency signals in the field of partial discharge detection, and a detection circuit is used for processing the partial discharge signals, so that the purpose of preliminarily reducing the frequency of the partial discharge signals is achieved. In order to retain the original information of the acquired signal to the maximum extent, an active integration circuit is adopted to integrate the detected single-pulse discharge signal and reduce the signal frequency again. After the partial discharge signal is amplified, detected and integrated, the frequency of the output signal is reduced, and the signal is a positive value, so that the sampling requirement of the controller module is met. The controller adopts a DSPf28335 chip of TI company, and because the DSP can only collect signals above 0V, an inverting circuit is added behind the integrating circuit, and the amplitude becomes positive after the waveform after integration is inverted.
Example 3
In this embodiment, a CC2530 chip, a core circuit thereof, and a radio frequency module are arranged in the wireless transmission module, the CC2530 chip is also called as Zigbee technology, the Zigbee technology is a low-rate and short-distance wireless network technology, and a Zigbee terminal node can transmit data in a radio frequency form, so that short-distance wireless communication can be achieved, and the cost and power consumption are low, so that the modular wireless partial discharge detection device is suitable for real-time detection information transmission of a sensor in an electrical device. The sensor and the Zigbee module are combined to be manufactured into a wireless sensor, and the wireless sensor is automatically networked and can be used in a plug-and-play manner. The ZigBee network consists of a coordinator, reference nodes and unknown nodes, the ZigBee reference nodes are CC2530 chips, the protocol is a gateway NLE-PE90000, and the ZigBee network supports a ZigBee protocol and an Ethernet protocol. The Zigbee module and the sensor nodes are arranged at the same position in the electrical equipment, signals acquired by the sensor nodes are transmitted to the Zigbee module through the conditioning circuit, the ZigBee unknown node processor CC2530 serves as a terminal to process data of the sensor nodes in real time, and finally the ZigBee reference nodes transmit the processed values to the outside of the electrical equipment.
Claims (5)
1. A modularized wireless partial discharge detection device comprises a partial discharge detection sensor (1), a signal processing circuit (4) and a wireless transmission block (5), and is characterized in that one end of the partial discharge detection sensor (1) is connected with a shielded cable (3) through an SMA joint (2), the other end of the shielded cable (3) is connected with the signal processing circuit (4), the other end of the signal processing circuit (4) is connected with the wireless transmission module (5), the partial discharge sensor (4) is coupled on an electrical equipment grounding lead wire, and is fixed on the grounding lead wire through a sealed tensile fixing sheath and a nut, the signal processing circuit (4) and the wireless transmission module (5) are welded on a PCB board together, an amplification module, a detection module, an integration module and a controller module are arranged in the signal processing circuit (4), the wireless transmission module (5) is internally provided with a CC2530 chip, a core circuit thereof and a wireless radio frequency circuit.
2. The device as claimed in claim 1, wherein the outer casing of the partial discharge detection sensor (1) is a hollow oval structure, and the outer casing is made of anti-interference shielding material.
3. The device according to claim 1, wherein the amplification module, the detection module, the integration module and the controller module inside the signal processing circuit (4) are connected in series.
4. The device according to claim 1, wherein the signal processing circuit (4) and the wireless transmission module (5) are soldered together to a PCB board having a power supply interface.
5. The device for detecting the modularized wireless partial discharge, according to claim 1, is characterized in that the whole partial discharge detection sensor (1) is hermetically connected to the outer surface of the grounding lead of the electrical equipment through a sealed tensile fixing sheath, and the sealed tensile fixing sheath is fixedly connected to two ends of the sensor shell through bolts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110274209.7A CN112946438A (en) | 2021-03-15 | 2021-03-15 | Modularized wireless partial discharge detection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110274209.7A CN112946438A (en) | 2021-03-15 | 2021-03-15 | Modularized wireless partial discharge detection device |
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| CN202110274209.7A Pending CN112946438A (en) | 2021-03-15 | 2021-03-15 | Modularized wireless partial discharge detection device |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109406960A (en) * | 2018-10-18 | 2019-03-01 | 国网黑龙江省电力有限公司电力科学研究院 | A kind of partial discharge of transformer on-line detecting system and method based on wireless sensor |
| CN110308368A (en) * | 2019-07-05 | 2019-10-08 | 哈尔滨理工大学 | A kind of cable intermediate head partial discharge on-Line Monitor Device |
| CN209894907U (en) * | 2018-10-31 | 2020-01-03 | 江苏骏龙光电科技股份有限公司 | Ultrahigh frequency sensor for online detection of GIS partial discharge of wireless transmission |
-
2021
- 2021-03-15 CN CN202110274209.7A patent/CN112946438A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109406960A (en) * | 2018-10-18 | 2019-03-01 | 国网黑龙江省电力有限公司电力科学研究院 | A kind of partial discharge of transformer on-line detecting system and method based on wireless sensor |
| CN209894907U (en) * | 2018-10-31 | 2020-01-03 | 江苏骏龙光电科技股份有限公司 | Ultrahigh frequency sensor for online detection of GIS partial discharge of wireless transmission |
| CN110308368A (en) * | 2019-07-05 | 2019-10-08 | 哈尔滨理工大学 | A kind of cable intermediate head partial discharge on-Line Monitor Device |
Non-Patent Citations (1)
| Title |
|---|
| 王坤涵: "环网柜局部放电在线监测系统研制", 《中国优秀博硕士学位论文全文数据库(硕士) 工程科技Ⅱ辑》 * |
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Application publication date: 20210611 |