CN101762777A - Local discharging on-line detecting and positioning system for electric transformer - Google Patents
Local discharging on-line detecting and positioning system for electric transformer Download PDFInfo
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- CN101762777A CN101762777A CN201010023128A CN201010023128A CN101762777A CN 101762777 A CN101762777 A CN 101762777A CN 201010023128 A CN201010023128 A CN 201010023128A CN 201010023128 A CN201010023128 A CN 201010023128A CN 101762777 A CN101762777 A CN 101762777A
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Abstract
本发明涉及一种电力变压器局部放电在线检测和定位系统。它包括ARM处理器，该ARM处理器连接多路信号检测通道、LCD显示屏、键盘、SD卡座和串口。多路信号检测通道由光纤超声波传感器依次连接光电二极管、I/V转换器、放大器、滤波器和门限判决器构成。多路信号检测通道中的光纤超声波传感器检测局部放电时产生的声发射信号，经过光电转换、I/V转换、放大、滤波后，通过门限判决器输出。ARM处理器是将多路检测信号进行分析处理并通过LCD显示屏显示放电源位置，并将数据保存在SD卡中，通过串口发送到上位机。本发明简单实用，抗电磁干扰性能强，工作稳定，可用于对电力变压器局部放电检测和定位。
The invention relates to an on-line detection and positioning system for partial discharge of a power transformer. It includes an ARM processor connected with multiple signal detection channels, an LCD display, a keyboard, an SD card holder and a serial port. The multi-channel signal detection channel is composed of a fiber optic ultrasonic sensor connected to a photodiode, an I/V converter, an amplifier, a filter and a threshold decision device in sequence. The acoustic emission signal generated when the fiber optic ultrasonic sensor in the multi-channel signal detection channel detects the partial discharge is output through the threshold decision device after photoelectric conversion, I/V conversion, amplification and filtering. The ARM processor analyzes and processes the multi-channel detection signals and displays the position of the discharge source through the LCD display, saves the data in the SD card, and sends it to the host computer through the serial port. The invention is simple and practical, has strong anti-electromagnetic interference performance and stable operation, and can be used for detecting and locating the partial discharge of power transformers.
Description
Technical field
The present invention addresses online detection of Partial Discharge in Power Transformer and positioning system, be exactly to utilize the multiple signals sense channel to survey the acoustic emission signal that shelf depreciation produced of power transformer inside specifically, and obtain the discharge source position by signal Processing, belong to field of photoelectric technology.
Background technology
Along with developing rapidly of national economy and power industry, the electrical network scale enlarges day by day, and electric pressure further improves, and to the stability of electric system, the operation conditions of reliability and various electrical equipments is had higher requirement.Power transformer is as electric system hinge equipment, and its stability directly influences the stability of electrical network.Discover, come from the insulation degradation of transformer near half power transformer accident.Insulation fault often originates from the shelf depreciation of transformer inside, therefore use partial discharge of transformer detection and positioning system that power transformer is carried out on-line monitoring, sign in advance can note abnormalities, and can determine the position of discharge source, conveniently transformer is keeped in repair and changes, can not only improve power supply reliability effectively, also reduce the maintenance cost of electric system.
Shelf depreciation is the electric discharge phenomena that the electrical strength lower position takes place in insulator, and it shows as puncture, the partial breakdown of liquid medium or the creeping discharge of solid dielectric part etc. of filler in the insulator.When shelf depreciation appears in transformer, can follow the generation of phenomenons such as electric pulse, ultrasound wave, light, heat and chemical change.Correspondingly, the detection method of shelf depreciation has electric pulse detection method, gas chromatographic detection method, ultrasonic Detection Method, Electromagnetic Wave Detection method, light detection method, infrared detection method etc.
Ultrasonic Detection Method is measured convenient, is a kind of ripe partial discharge of transformer detection method that is tending towards, and has obtained using widely.But the conventional ultrasound wave sensor is subject to electromagnetic interference (EMI), and the transformer itself in the work will produce very strong electromagnetic field, so often measuring accuracy is relatively poor for traditional ultrasonic detection method, the location is inaccurate.Along with the development of optical fiber sensing technology, the fiber ultrasonic wave sensor can remedy the deficiency of conventional ultrasound wave sensor well because of it has good characteristics such as anti-electromagnetic interference (EMI), corrosion resistance and volume be little.
Chinese patent application number is to have described the device of shelf depreciation in a kind of on-line monitoring transformer in 95245275.8 the patent, it uses the optical fiber of high temperature resistant transformer oil to connect photoelectric switching circuit, the output of photoelectric switching circuit through amplifier and data acquisition processing circuit with the monitoring result printout.But do not relate to the location of Partial Discharge Sources.And number of patent application be 00812375.6 and number of patent application be 96190440.2 and number of patent application is that 00812375.6 patent describes all is Partial Discharge Detection, do not relate to the location.
Chinese patent application number has been described a kind of partial discharge of transformer electrical Location device in the patent of 93221150.X, when this installs according to Transformer Winding generation shelf depreciation, with point of discharge is the local discharge signal of middle mind-set two ends transmission and the relation of spark location, determines the position of point of discharge.Chinese patent application number is to have described a kind of transformer local discharging ultra-wide band sensor array positioning system and method thereof in 200610103665.0 the patent, and it adopts 4 array element ultra-wide band radio-frequency sensor arraies to survey and locate.
Summary of the invention
The objective of the invention is to solve Partial Discharge in Power Transformer detects and orientation problem, online detection of a kind of Partial Discharge in Power Transformer and positioning system are provided, the ultrasonic signal that the method that adopts a plurality of fiber ultrasonic wave sensor arrays and utilize threshold judgement is produced the discharge of voltage general ability portion is surveyed and is located, have simple in structure, cost is low, stable advantages of higher.
For achieving the above object, the present invention adopts following technical proposals:
Online detection of a kind of Partial Discharge in Power Transformer and positioning system comprise an arm processor, it is characterized in that described arm processor connects multiple signals sense channel, a LCD display, a keyboard, a SD deck and a serial ports.Described multiple signals sense channel is to connect a photodiode, an I/V converter, an amplifier, a wave filter and a threshold judgement device successively by a fiber ultrasonic wave sensor to constitute.
Above-mentioned fiber ultrasonic wave sensor is output as the continuous wave light signal.
Above-mentioned amplifier adopts instrument amplifier, and enlargement factor is above 30 times.
Above-mentioned wave filter adopts bandpass filter, free transmission range be 160KHz to 200KHz, and adjustable gain output is arranged.
Above-mentioned threshold judgement device adopts high speed voltage comparator, is provided with according to the noise size to be higher than the threshold level that reference voltage is about 0.5 volt.
Above-mentioned multiple signals sense channel links to each other with the I/O mouth of arm processor, and arm processor adopts external voltage to trigger the mode of interrupting and monitors in real time.
Above-mentioned keyboard (4) adopts the 4*4 key board, is used to be provided with various parameters.
The present invention has following conspicuous outstanding substantive distinguishing features and remarkable advantage compared with prior art:
(1) compare traditional ultrasonic sensor, adopt the fiber ultrasonic wave sensor to have anti-electromagnetic interference (EMI), advantages such as radiation hardness can significantly improve the accuracy that Partial Discharge in Power Transformer is measured and located.
(2) adopt the method for threshold judgement to monitor hyperacoustic arrival, adopt the method for digital-to-analog conversion sampling to have the advantages that to be simple and easy to realize, simplified design reduces cost to a great extent, and has good performance simultaneously.
(3) native system can compatible 4 to 6 sensor arraies, can arrange and select for use number of sensors according to field condition.
(4) show the on-site supervision situation in real time by the LCD liquid crystal, and can show the position coordinates of discharge source, convenient for maintaining personnel safeguard.Data can also be preserved or send on the host computer convenient monitoring by serial ports.
Description of drawings
Fig. 1 is online detection of Partial Discharge in Power Transformer and positioning system synoptic diagram.
Fig. 2 is a multiple signals sense channel synoptic diagram.
Embodiment
A preferred embodiment accompanying drawings involved in the present invention is as follows:
Embodiment one: referring to Fig. 1 and Fig. 2, online detection of this Partial Discharge in Power Transformer and positioning system comprise an arm processor 2, and this arm processor 2 connects multiple signals sense channel 1, LCD display 3, keyboard 4, a SD deck 5 and a serial ports 6.The identical input passage 1 of multichannel is wherein arranged, and every road sense channel 1 connects a photodiode 8, I/V converter 9, amplifier 10, a wave filter 11 and a threshold judgement device 12 successively by a fiber ultrasonic wave sensor 7 and constitutes.Principle of work is: every road input passage 1 is used for detecting ultrasound wave, it utilizes optical fibre ultrasonic sensor 7 that the ultrasonic signal that shelf depreciation produced is transformed into light signal, carry out opto-electronic conversion by photodiode 8 again, the I/V converter of forming by amplifier 9 then, current conversion is become voltage, and through amplifier 10 amplifications, carry out filtering and denoising by bandpass filter 11 again, carry out threshold judgement by threshold judgement device 12 then, what export is square-wave signal, the high level representative has ultrasonic signal, the no ultrasonic signal of low level representative.Multichannel road input passage 1 all is connected on the arm processor 2, and arm processor 2 is by the moment of the method monitoring ultrasound wave arrival of level triggered interrupts.Because ultrasound wave arrives the moment difference of each sensor, arm processor 2 just can obtain the mistiming between them, just can obtain the coordinate position of discharge source by calculating, and passes through liquid crystal display 3 demonstration discharge source positions.Realize monitoring and record automatically.
During the system real work, at first fiber ultrasonic wave sensor array is carried out layout, can select 4 to 6 sensors for use according to actual conditions.Need scatter during sensor array Column Layout, can adopt front and back six direction layout up and down, the position does not have specific requirement, but needs behind the layout good position position coordinates of sensor is imported by keyboard.When partial discharge phenomenon produces, after system successfully captures, the discharge source position display on liquid crystal display, is recorded on the SD card and by serial ports and sends alerting signal, make things convenient for the technician to keep in repair.
Embodiment two: present embodiment is identical with embodiment one, and special feature is: fiber ultrasonic wave sensor 7 is output as the continuous wave light signal.
Amplifier 10 adopts instrument amplifier, and enlargement factor is above 30 times.
Multiple signals sense channel 1 links to each other with the I/O mouth of arm processor 2, and arm processor 2 adopts external voltage to trigger the mode of interrupting and monitors in real time.
Keyboard (4) adopts the 4*4 key board, is used to be provided with various parameters.
Claims (7)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010023128A CN101762777A (en) | 2010-01-21 | 2010-01-21 | Local discharging on-line detecting and positioning system for electric transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010023128A CN101762777A (en) | 2010-01-21 | 2010-01-21 | Local discharging on-line detecting and positioning system for electric transformer |
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| CN101762777A true CN101762777A (en) | 2010-06-30 |
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| CN201010023128A Pending CN101762777A (en) | 2010-01-21 | 2010-01-21 | Local discharging on-line detecting and positioning system for electric transformer |
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Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445619A (en) * | 2011-11-17 | 2012-05-09 | 北京交通大学 | Power transformer on-line state monitoring system based on audio information |
| CN102621460A (en) * | 2012-04-02 | 2012-08-01 | 武陟县电业总公司 | Ultrasonic detection device for partial discharge of transformer |
| CN102621458A (en) * | 2012-03-20 | 2012-08-01 | 上海市电力公司 | Cable partial discharge detecting system |
| CN102709037A (en) * | 2012-06-20 | 2012-10-03 | 湖北省电力公司电力试验研究院 | Transformer with built-in transducer |
| CN102879715A (en) * | 2012-09-20 | 2013-01-16 | 广州供电局有限公司 | Partial discharge detecting and positioning method for transformer |
| CN102879714A (en) * | 2012-09-20 | 2013-01-16 | 广州供电局有限公司 | Detection and positioning method for partial discharge of transformer |
| CN102998598A (en) * | 2011-09-09 | 2013-03-27 | 北京兴泰学成仪器有限公司 | Local discharge ultrasonic positioning device and local discharge ultrasonic positioning method |
| CN103675618A (en) * | 2013-11-30 | 2014-03-26 | 成都科泰地理信息技术有限公司 | Switchgear partial discharge inspecting instrument with printing function |
| CN103941164A (en) * | 2014-04-10 | 2014-07-23 | 江苏骏龙电力科技股份有限公司 | Portable intelligent dual-purpose electronic device for partial discharge and on-line monitoring of transformer |
| CN104237682A (en) * | 2014-09-02 | 2014-12-24 | 国家电网公司 | Transformer abnormal sound analysis device |
| CN106093716A (en) * | 2016-05-26 | 2016-11-09 | 中国南方电网有限责任公司电网技术研究中心 | Partial discharge detection device for electrical equipment |
| CN107064757A (en) * | 2017-04-17 | 2017-08-18 | 国网江苏省电力公司电力科学研究院 | Partial discharge of transformer intellectualized detection device and method based on multisensor |
| CN107064766A (en) * | 2017-02-27 | 2017-08-18 | 厦门理工学院 | A kind of partial discharge monitoring Cap for tin body |
| CN108037410A (en) * | 2017-11-24 | 2018-05-15 | 华北电力大学 | A kind of shelf depreciation method for ultrasonic locating and device based on controllable responding power |
| CN108700624A (en) * | 2018-03-23 | 2018-10-23 | 深圳市锐明技术股份有限公司 | A kind of automobile and its vehicle-mounted monitoring equipment, signals of vehicles detection circuit |
| CN108776288A (en) * | 2018-07-25 | 2018-11-09 | 杭州顿恒科技有限公司 | A kind of novel local On-line Discharge monitoring device based on wireless aware |
| CN109001604A (en) * | 2018-10-17 | 2018-12-14 | 湖北工业大学 | A kind of strength grading system and method based on local discharge of electrical equipment |
| CN111308287A (en) * | 2020-03-06 | 2020-06-19 | 西南交通大学 | A method for ultrasonic localization of partial discharge fault points in traction transformers |
| CN113341280A (en) * | 2021-04-29 | 2021-09-03 | 西安交通大学 | Online positioning and monitoring system and method for partial discharge in transformer oil |
| CN117420503A (en) * | 2023-12-15 | 2024-01-19 | 国网天津市电力公司电力科学研究院 | Positioning system and method for transformer internal inspection equipment |
-
2010
- 2010-01-21 CN CN201010023128A patent/CN101762777A/en active Pending
Cited By (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998598A (en) * | 2011-09-09 | 2013-03-27 | 北京兴泰学成仪器有限公司 | Local discharge ultrasonic positioning device and local discharge ultrasonic positioning method |
| CN102445619A (en) * | 2011-11-17 | 2012-05-09 | 北京交通大学 | Power transformer on-line state monitoring system based on audio information |
| CN102621458A (en) * | 2012-03-20 | 2012-08-01 | 上海市电力公司 | Cable partial discharge detecting system |
| CN102621460A (en) * | 2012-04-02 | 2012-08-01 | 武陟县电业总公司 | Ultrasonic detection device for partial discharge of transformer |
| CN102709037A (en) * | 2012-06-20 | 2012-10-03 | 湖北省电力公司电力试验研究院 | Transformer with built-in transducer |
| CN102879714A (en) * | 2012-09-20 | 2013-01-16 | 广州供电局有限公司 | Detection and positioning method for partial discharge of transformer |
| CN102879715A (en) * | 2012-09-20 | 2013-01-16 | 广州供电局有限公司 | Partial discharge detecting and positioning method for transformer |
| CN102879714B (en) * | 2012-09-20 | 2015-09-23 | 广州供电局有限公司 | Partial discharge of transformer detection and location method |
| CN103675618A (en) * | 2013-11-30 | 2014-03-26 | 成都科泰地理信息技术有限公司 | Switchgear partial discharge inspecting instrument with printing function |
| CN103941164A (en) * | 2014-04-10 | 2014-07-23 | 江苏骏龙电力科技股份有限公司 | Portable intelligent dual-purpose electronic device for partial discharge and on-line monitoring of transformer |
| CN104237682A (en) * | 2014-09-02 | 2014-12-24 | 国家电网公司 | Transformer abnormal sound analysis device |
| CN106093716A (en) * | 2016-05-26 | 2016-11-09 | 中国南方电网有限责任公司电网技术研究中心 | Partial discharge detection device for electrical equipment |
| CN107064766A (en) * | 2017-02-27 | 2017-08-18 | 厦门理工学院 | A kind of partial discharge monitoring Cap for tin body |
| CN107064757A (en) * | 2017-04-17 | 2017-08-18 | 国网江苏省电力公司电力科学研究院 | Partial discharge of transformer intellectualized detection device and method based on multisensor |
| CN107064757B (en) * | 2017-04-17 | 2019-11-29 | 国网江苏省电力公司电力科学研究院 | Partial discharge of transformer intellectualized detection device and method based on multisensor |
| CN108037410A (en) * | 2017-11-24 | 2018-05-15 | 华北电力大学 | A kind of shelf depreciation method for ultrasonic locating and device based on controllable responding power |
| CN108037410B (en) * | 2017-11-24 | 2021-05-14 | 华北电力大学 | Partial discharge ultrasonic positioning method and device based on controllable response power |
| CN108700624A (en) * | 2018-03-23 | 2018-10-23 | 深圳市锐明技术股份有限公司 | A kind of automobile and its vehicle-mounted monitoring equipment, signals of vehicles detection circuit |
| WO2019178842A1 (en) * | 2018-03-23 | 2019-09-26 | 深圳市锐明技术股份有限公司 | Automobile, and vehicle-mounted monitoring device and vehicle signal detection circuit thereof |
| CN108776288A (en) * | 2018-07-25 | 2018-11-09 | 杭州顿恒科技有限公司 | A kind of novel local On-line Discharge monitoring device based on wireless aware |
| CN109001604A (en) * | 2018-10-17 | 2018-12-14 | 湖北工业大学 | A kind of strength grading system and method based on local discharge of electrical equipment |
| CN109001604B (en) * | 2018-10-17 | 2021-02-02 | 湖北工业大学 | Intensity grading system and method based on partial discharge of electrical equipment |
| CN111308287A (en) * | 2020-03-06 | 2020-06-19 | 西南交通大学 | A method for ultrasonic localization of partial discharge fault points in traction transformers |
| CN111308287B (en) * | 2020-03-06 | 2021-04-20 | 西南交通大学 | A method for ultrasonic localization of partial discharge fault points in traction transformers |
| CN113341280A (en) * | 2021-04-29 | 2021-09-03 | 西安交通大学 | Online positioning and monitoring system and method for partial discharge in transformer oil |
| CN117420503A (en) * | 2023-12-15 | 2024-01-19 | 国网天津市电力公司电力科学研究院 | Positioning system and method for transformer internal inspection equipment |
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Application publication date: 20100630 |