CN102680820A - Automatic testing and diagnosing system for corrosion fault points of grounding grid of substation - Google Patents

Automatic testing and diagnosing system for corrosion fault points of grounding grid of substation Download PDF

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Publication number
CN102680820A
CN102680820A CN2012101404465A CN201210140446A CN102680820A CN 102680820 A CN102680820 A CN 102680820A CN 2012101404465 A CN2012101404465 A CN 2012101404465A CN 201210140446 A CN201210140446 A CN 201210140446A CN 102680820 A CN102680820 A CN 102680820A
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CN
China
Prior art keywords
corrosion
trouble spot
microcontroller
transformer substation
automatic test
Prior art date
Application number
CN2012101404465A
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Chinese (zh)
Inventor
张�浩
刘强
许刚
杜贇
刘丰文
曹力力
Original Assignee
湖州电力局
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Publication date
Application filed by 湖州电力局 filed Critical 湖州电力局
Priority to CN2012101404465A priority Critical patent/CN102680820A/en
Publication of CN102680820A publication Critical patent/CN102680820A/en

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Abstract

The invention discloses an automatic testing and diagnosing system for corrosion fault points of a grounding grid of a substation. The automatic testing and diagnosing system comprises a data acquisition terminal and a corrosion fault point diagnosis and analysis upper computer, wherein the data acquisition terminal is connected with the corrosion fault point diagnosis and analysis upper computer through a USB (Universal Serial Bus) interface of the corrosion fault point diagnosis and analysis upper computer. The automatic testing and diagnosing system disclosed by the invention has the advantages of high diagnosis efficiency, simplicity and convenience in operation and accuracy in measurement; and under the conditions that no power is failed and large-area digging is not carried out, corrosion and point breaking conditions of the grounding grid can be detected by only means of the resistance among grounding down leads of the grounding grid.

Description

The automatic test diagnosis system in grounding net of transformer substation corrosion trouble spot

Technical field

The present invention relates to a kind of power system security diagnostic device, relate in particular to a kind of corrosion trouble spot intelligent diagnostics device of grounding net of transformer substation.

Background technology

Grounded screen is the visual plant of electric power system power plant and substation, need satisfy the requirement of working earthing, protection ground and lightning protection simultaneously.Grounded screen not only provides a public electric RP, and when the system failure, drains fault current rapidly, prevents that earth potential from raising unusually, guarantees step voltage, touch voltage and transfer voltage in the safe range of allowing, ensures the person and device security.So the quality of grounded screen ground connection performance is directly connected to generating plant and the staff's of substation the personal safety and the normal operation of equipment, qualified grounded screen has a very important role in safe operation of power system.

For many years, current and voltage method or ground connection megger method measurement of Grounding Resistance value are adopted in the test of electric system grounded screen mostly.The extent of corrosion of grounded screen then injects big electric current through high-power transformer to earthed system and reaches test purpose.Above-mentioned measuring method often can not reach accurate Testing requirement owing to there is the influence of interference sources, and error is bigger.

Summary of the invention

Technical matters to be solved by this invention just provide a kind of diagnosis efficiency high, easy and simple to handle, measure accurately the automatic test diagnosis system in grounding net of transformer substation corrosion trouble spot; It is not having a power failure and is not carrying out under the situation of large tracts of land excavation; Only rely on resistance between the grounded screen down conductor, just can the corrosion and the breakpoint situation of grounded screen be detected.

For solving the problems of the technologies described above; The present invention adopts following technical scheme: the automatic test diagnosis system in a kind of grounding net of transformer substation corrosion trouble spot; It is characterized in that: comprise data collection station and corrosion trouble spot diagnostic analysis host computer, said data collection station is attached thereto through the USB interface that corrodes trouble spot diagnostic analysis host computer and connects.

Further; Said intelligent acquisition terminal comprises microcontroller, LCD and is furnished with the data acquisition converter of preposition anti-jamming circuit; Said data acquisition converter is connected with high precision reference potential device with microcontroller respectively and controlled by it; Said data acquisition converter is gathered the voltage or the current signal of each monitoring point of grounded screen; And exporting the curtage signal of each monitoring point to LCD through microcontroller, said corrosion trouble spot diagnostic analysis host computer is connected with microcontroller through the usb communication interface and working power is provided for it.

Further, said data acquisition converter further comprises analog to digital converter.

Further, said analog to digital converter has the SPI serial line interface, and is connected with the input interface of microcontroller through this SPI serial line interface.

Further, said analog to digital converter is ∑-24 high-precision adcs of △ type.

Further, said microcontroller is integrated with USB2.0 interface, SIE and enhancement mode 8051 microprocessors, and is connected with corrosion trouble spot diagnostic analysis host computer through its usb communication interface.

Further, the said LCD liquid article display of liquid article display modules that has been integrated.

The present invention can diagnose out grounding net of transformer substation corrosion trouble spot at short notice and the earth mat degree of corrosion of whole earth mat is made safety assessment and early warning.Search grounded screen breakpoint and the method for corroding section with respect to traditional megger method and large-area power-cuts excavation; This system provides a kind of diagnostic method of reliable and easy practicability; Can not have a power failure and not carry out under the situation of large tracts of land excavation; Only rely on resistance between the grounded screen down conductor, just can the corrosion and the breakpoint situation of grounded screen be detected.This just can in time find grounded screen fault, and avoid because of grounded screen fault to the harm that substation equipment and staff cause, ensured that power system security moves reliably.This not only has realistic meaning very importantly, also has economic benefit.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention is further described:

Fig. 1 is the structural principle synoptic diagram of system of the present invention;

Fig. 2 is the synoptic diagram of an embodiment of system of the present invention.

Embodiment

Fig. 1 shows the structural principle synoptic diagram of system of the present invention more visually, and total system mainly is made up of two parts: data acquisition and measurement mechanism and ground net corrosion diagnosis PC host computer 8 are provided with application software in host computer 8.Data acquisition and measurement mechanism preferably include a DC current source 1 and an intelligent data acquisition terminal 11 that the 0--60A DC current can be provided.As required, DC current source 1 is between each measurement point and point of excitation, and to the appropriate pumping signal of grounded screen 9 inputs, 9 pairs of selected measurement points of data collection station are measured then, and data transmission is diagnosed host computer 8 to ground net corrosion.Corrosion diagnostic detection software systems in the host computer 8 run on the on-site computer; Physical topological structure according to grounded screen; Generate the corresponding electrical circuits accounting equation; According to the grounded screen data that collect, calculate again, and then judge the corrosion situation of grounded screen through the resistance of computation model to each section of grounded screen.

The present invention adopts man-machine interface, mainly comprises creating engineering interface, data acquisition interface, diagnostic result interface.Wherein in creating engineering interface, set up engineering and project, next just can get into the data acquisition interface and test as long as import earth mat dimension information to be measured.Behind the EOT, can calculate this group data at once, and with situation intuitively result of calculation is presented in display screen, extent of corrosion is different, and the color that every band iron shows is also different.

Outstanding behaviours of the present invention the business characteristic of the automatic testing and diagnosing of substation ground net; Utilize the detection means of electronization to replace existing manual detection; Advantage to the ground net corrosion diagnostic programmed is fully used, and has realized ground net corrosion diagnosis business function is expanded and perfect to greatest extent.

It shown in Fig. 2 the synoptic diagram of a preferred embodiment of data collection station 11 of the present invention; Mainly by forming: direct supply able to programme 1, microcontroller 2, supply module 4, program storage block 5 (being preferably the EEPROM of a 64KB), LCD 6 with the lower part; And preferably include system's control panel (not showing among the figure)

Data collection station 11 further comprises a data acquisition converter 10 of being furnished with preposition anti-jamming circuit.7 communications are connected and controlled by it data acquisition converter 10 with high precision reference potential device with microcontroller 2 respectively.Data acquisition converter 10 is gathered the voltage or the current signal of each monitoring point of grounded screen 9, and the curtage signal of each monitoring point is passed through microcontroller 2 calculating and data processing, exports to LCD 6 and shows.

Host computer 8 is connected with microcontroller 2 through the usb communication interface also provides working power for it.

Preposition anti-jamming circuit of the present invention comprises integrator and the wave filter that AD7718 is built-in; And the filtering circuit of front end; Can effectively suppress under the strong-electromagnetic field environment interference to earth mat; Especially interference that can the good restraining power frequency component makes that the data that collect reach precisely, stablize, reliable requirement.

Further, data acquisition converter 10 comprises a plurality of high-precision adcs 3.

Further, analog to digital converter 3 has the SPI serial line interface, and is connected with the input interface of microcontroller 2 through this SPI serial line interface.

Further, analog to digital converter 3 is ∑-24 high-precision adcs of △ type.

Further, microcontroller 2 is integrated with USB2.0 interface, SIE and enhancement mode 8051 microprocessors, and is connected with corrosion trouble spot diagnostic analysis host computer 8 through its usb communication interface.

Further, the LCD 6 liquid article display of liquid article display modules that has been integrated.

The transmission mode of data collection station 11 of the present invention is: utilize intelligent grounded screen data collection station to gather the multiple signals of grounded screen test node simultaneously; Behind high-precision adc 3; The 24bit digital signal is transferred to microcontroller 2 (CY7C68013) through the SPI interface; Through the USB interface of microcontroller 2 data are sent on the host computer 2 then and handled, judge and analysis.Simultaneously, IIC interface SLC and the SDA through CY7C68013 microcontroller 2 sends into LCD 6.

The present invention is corroded trouble spot diagnostic analysis host computer 8 and is adopted Windows NT/win 7 operating systems to carry out online or off-line calculates, and generates chart, grid and output.

Open criterion is followed in system design, makes the user under the environment that reality is used, enjoy maximum data and gathers robotization and corrosion check and analysis systematization.In native system, the opening of system shows the open nature of data acquisition system (DAS), data base management system (DBMS) and applied analysis system, and exchange between the data and power supply have adopted the communication standard usb protocol of industry.

The above is merely specific embodiment of the present invention, but technical characterictic of the present invention is not limited thereto, and any those skilled in the art is in the field of the invention, and the variation of being done or modify all is encompassed among the claim of the present invention.

Claims (7)

1. grounding net of transformer substation corrodes the automatic test diagnosis system in trouble spot; It is characterized in that: comprise data collection station (11) and corrosion trouble spot diagnostic analysis host computer (8), said data collection station (11) is attached thereto through the usb communication interface that corrodes trouble spot diagnostic analysis host computer (8) and connects.
2. the automatic test diagnosis system in grounding net of transformer substation as claimed in claim 1 corrosion trouble spot; It is characterized in that: said intelligent acquisition terminal (11) comprises microcontroller (2), LCD (6) and is furnished with the data acquisition converter (10) of preposition anti-jamming circuit; Said data acquisition converter (10) is connected with high precision reference potential device (7) with microcontroller (2) respectively and controlled by it; Said data acquisition converter (10) is gathered the voltage or the current signal of each monitoring point of grounded screen (9); And exporting the curtage signal of each monitoring point to LCD (6) through microcontroller (2), said corrosion trouble spot diagnostic analysis host computer (8) is connected with microcontroller (2) through the usb communication interface and working power is provided for it.
3. the automatic test diagnosis system in grounding net of transformer substation as claimed in claim 2 corrosion trouble spot, it is characterized in that: said data acquisition converter (10) further comprises analog to digital converter (3).
4. like the automatic test diagnosis system of claim 2 or 3 described grounding net of transformer substation corrosion trouble spots, it is characterized in that: said analog to digital converter (3) has the SPI serial line interface, and is connected with the input interface of microcontroller (2) through this SPI serial line interface.
5. the automatic test diagnosis system in grounding net of transformer substation as claimed in claim 4 corrosion trouble spot, it is characterized in that: said analog to digital converter (3) is ∑-24 high-precision adcs of △ type.
6. the automatic test diagnosis system in grounding net of transformer substation as claimed in claim 2 corrosion trouble spot; It is characterized in that: said microcontroller (2) is integrated with USB2.0 interface, SIE and enhancement mode 8051 microprocessors, and is connected with corrosion trouble spot diagnostic analysis host computer (8) through its usb communication interface.
7. the automatic test diagnosis system in grounding net of transformer substation as claimed in claim 2 corrosion trouble spot is characterized in that: said LCD (6) the has been integrated liquid article display of liquid article display modules.
CN2012101404465A 2012-05-08 2012-05-08 Automatic testing and diagnosing system for corrosion fault points of grounding grid of substation CN102680820A (en)

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Application Number Priority Date Filing Date Title
CN2012101404465A CN102680820A (en) 2012-05-08 2012-05-08 Automatic testing and diagnosing system for corrosion fault points of grounding grid of substation

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102928704A (en) * 2012-10-26 2013-02-13 湖州电力局 Intelligent diagnosis method for corrosion failure point of transformer substation grounding grid
CN103616616A (en) * 2013-12-09 2014-03-05 石家庄弘耀能源科技有限公司 Fault detection method for large-scale grounding grid
CN103792461A (en) * 2013-11-21 2014-05-14 国家电网公司 Grounding grid breakpoint diagnostic method for transient electromagnetic method
CN104898024A (en) * 2015-06-10 2015-09-09 国网上海市电力公司 Transformer station grounding network fault diagnosis method based on synthesis of surface potential and magnetic induction strength
CN105021953A (en) * 2015-06-10 2015-11-04 国网上海市电力公司 A transformer substation grounding grid corrosion detection system and method based on earth's surface magnetic induction intensity
CN105071060A (en) * 2015-08-15 2015-11-18 宁夏中科天际防雷股份有限公司 Metal grounding grid easy to determine corrosion position

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CN101216523A (en) * 2007-12-28 2008-07-09 华北电力大学 Substation grounding net defect diagnostic method and apparatus
CN101571566A (en) * 2009-06-08 2009-11-04 南京工业职业技术学院 System for diagnosing and positioning ground grid faults of electric system
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CN201724977U (en) * 2010-03-08 2011-01-26 湖北省电力试验研究院 Intelligent measurement system for grounding grid nodal voltage
CN201828632U (en) * 2010-10-26 2011-05-11 上海天晶电力科技发展有限公司 Transformer substation grounded screen intelligent diagnostic apparatus
CN202522658U (en) * 2012-05-08 2012-11-07 湖州电力局 System for automatically testing and diagnosing corrosion fault points of substation grounding grid

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1245898A (en) * 1999-07-02 2000-03-01 清华大学 Diagnosis method of earth screen corrosion and breakpoint of electric substation and its measurement and diagnosis system
KR100657855B1 (en) * 2005-12-15 2006-12-21 벽산엔지니어링주식회사 A method for detecting grounded network erosion and broken point of substation
KR20070063709A (en) * 2005-12-15 2007-06-20 벽산엔지니어링주식회사 A system for detecting grounded network erosion and broken point of substation
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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102928704A (en) * 2012-10-26 2013-02-13 湖州电力局 Intelligent diagnosis method for corrosion failure point of transformer substation grounding grid
CN102928704B (en) * 2012-10-26 2014-12-17 湖州电力局 Intelligent diagnosis method for corrosion failure point of transformer substation grounding grid
CN103792461B (en) * 2013-11-21 2016-08-17 国家电网公司 A kind of grounded screen breaking point diagnosis method of transient electromagnetic method
CN103792461A (en) * 2013-11-21 2014-05-14 国家电网公司 Grounding grid breakpoint diagnostic method for transient electromagnetic method
CN103616616A (en) * 2013-12-09 2014-03-05 石家庄弘耀能源科技有限公司 Fault detection method for large-scale grounding grid
CN103616616B (en) * 2013-12-09 2017-02-08 河北弘耀新能源科技有限公司 Fault detection method for large-scale grounding grid
CN104898024A (en) * 2015-06-10 2015-09-09 国网上海市电力公司 Transformer station grounding network fault diagnosis method based on synthesis of surface potential and magnetic induction strength
CN105021953A (en) * 2015-06-10 2015-11-04 国网上海市电力公司 A transformer substation grounding grid corrosion detection system and method based on earth's surface magnetic induction intensity
CN104898024B (en) * 2015-06-10 2017-11-03 国网上海市电力公司 The Failure Diagnosis of Substation Ground Network method of comprehensive surface potential and magnetic induction intensity
CN105021953B (en) * 2015-06-10 2018-03-16 国网上海市电力公司 Grounding net of transformer substation corrosion detection system and method based on earth's surface magnetic induction intensity
CN105071060A (en) * 2015-08-15 2015-11-18 宁夏中科天际防雷股份有限公司 Metal grounding grid easy to determine corrosion position
CN105071060B (en) * 2015-08-15 2019-10-29 宁夏中科天际防雷股份有限公司 Convenient for determining the metal grounding network of corrosion sites

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Application publication date: 20120919