CN103792418A - Intelligent stray current testing instrument - Google Patents

Intelligent stray current testing instrument Download PDF

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Publication number
CN103792418A
CN103792418A CN201410006054.9A CN201410006054A CN103792418A CN 103792418 A CN103792418 A CN 103792418A CN 201410006054 A CN201410006054 A CN 201410006054A CN 103792418 A CN103792418 A CN 103792418A
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China
Prior art keywords
data
intelligent
instrument
stray current
host computer
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Pending
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CN201410006054.9A
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Chinese (zh)
Inventor
王贵成
曹顺
宋琳
姜长洪
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Shenyang University of Chemical Technology
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Shenyang University of Chemical Technology
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Priority to CN201410006054.9A priority Critical patent/CN103792418A/en
Publication of CN103792418A publication Critical patent/CN103792418A/en
Pending legal-status Critical Current

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Abstract

The invention discloses an intelligent stray current testing instrument and relates to a testing instrument. According to the intelligent stray current testing instrument, detection signals are provided by an alternating current and direct current potential sensor, field data are continuously acquired by a single-chip microcomputer system through an A/D channel, the data are stored after being calculated and processed and are passed back to an upper computer regularly, and then pipeline corrosion conditions are predicted after the data are calculated and processed. The testing instrument can acquire alternating current and direct current pipe-to-soil potential change data for several consecutive days and can be buried underground completely to prevent theft. Field tests show that the instrument is stable in operation, measurement accuracy meets technological requirements totally, data communication performance is reliable, operation is easy and quick, the intelligent zero point and measuring range adjusting function is achieved, and the wireless data transmission function can be added as needed. The intelligent stray current testing instrument can be used for assisting in the detection of the metal pipeline corrosion and leakage conditions.

Description

A kind of intelligent stray current tester table
Technical field
The present invention relates to a kind of test instrumentation, particularly relate to a kind of intelligent stray current tester table.
Background technology
Stray current is one of major reason causing underground Metal pipeline corrosion leakage, when the track laying along ground when D.C. high-current flows, DC current is except flowing in orbit, also can leak into the earth, on the metallic conduit of the earth, flow, then get back to power supply, the electric current of this part leakage is called stray current.It is mainly by generations such as railway line and ac high-voltage power transmission lines.Stray current has formed in flow process that two poor by externally-applied potential and the corrosion cell set up has accelerated the corrosion process of metallic conduit.Therefore often monitor the situation that oil transportation (gas) pipeline is affected by stray current, so that prediction corrosive pipeline state takes suitable drainage measure to be very important.
The measurement of stray current is that the variation by pipe-to-soil potential obtains, and pipe-to-soil potential is unstable, each point pipe-to-soil potential time to time change amplitude is while reaching the three ten-day period of hot season, indicates the underground stray current that exists of check point.There is its normal spontaneous potential value (being generally several volts at zero point) for a certain region pipe-to-soil potential, in the time there is the normal current potential situation of substantial deviation, illustrate that this location is subject to strong underground stray current invasion and attack.Meanwhile, time and position that the frequency of stray current and size, stray current occur on pipeline, be the important parameter of assay and prediction Corrosion of Oil Pipeline situation.Due to the analysis to Corrosion of underground pipeline with estimate and need a large amount of stray current data, and these data should be distributed in the scope of pipeline very long distance along the line, and some test point synchronism detections are obtained.Therefore, it is very difficult testing and record stray current by artificial method, must design by meter specially, realizes the intellectual monitoring function of stray current.
Summary of the invention
The object of the present invention is to provide a kind of intelligent stray current tester table, this instrument can intelligent automatic zero point adjustment and span calibration; After finishing, test can, by the data of all collections by communication mode, reach in host computer, and standard data format is provided, in order to late time data processing.
 
The object of the invention is to be achieved through the following technical solutions:
A kind of intelligent stray current tester table, described instrumented data is changed from A/D, and according to systematic parameter judgement sampling type, determines its bound, thereby be converted to net result; This instrument is provided with filtering and correction program, its data module comprises data storage and read routine, in data storage and read routine, be provided with data checkout routine, communication slave computer module communicates to transmit data with host computer procedure according to the agreement of agreement, and instrument and host computer utilize serial ports to communicate; Host computer procedure sends instruction to program of lower computer, and slave computer carries out instruction and according to sending data to host computer with the form of school inspection, its circuit AC signal is delivered to CD4051 by bleeder rectifier circuit, amplifying circuit after amplifying; Direct current signal is also delivered to multicircuit switch CD4051 after dividing potential drop is amplified; ICL7135 is 14 AD conversion chips, and ICL7135 changes input signal, by the mode of interrupting, transformation result is sent into single chip computer AT 89C52 and process after EOC.
Described one intelligence stray current tester table, the task of described host computer procedure is to read the data that are stored in instrument, and its form is as requested stored in specific file.
Described one intelligence stray current tester table, the data that described host computer procedure transmits instrument are according to specific format conversion storage, so that analysis provides complete data to pipeline corrosion prediction.
Described one intelligence stray current tester table, described this instrument gathers AC and DC pipe-to-soil potential for continuous 72 hours.
Described one intelligence stray current tester table, described this instrument exchanges 0-200V, direct current-20--+20V.
Advantage of the present invention and effect are:
According to the feature of stray current and engineering test requirement, the present invention has developed intelligent stray current tester.This instrument can gather AC and DC pipe-to-soil potential for continuous 72 hours; Exchange 0-200V, direct current-20--+20V; Intelligence automatic zero point adjustment and span calibration; Free in 0-255 seconds sampling periods; Data storage capacity 4MByte; RS232C serial communication, can, by the data of all collections by communication mode, reach in host computer, and standard data format is provided, in order to late time data processing after test finishes.Test instrumentation is by AC and DC pipe-to-soil potential sensor detection signal, and A/D collection signal, by single-chip microcomputer processing, has continuously large capacity storage capability, and the performance of moving reliably and with long-term.
This test instrumentation can gather alternating current-direct current pipe-to-soil potential delta data for continuous many days, stolen for preventing instrument, can instrument all be imbedded underground, show through on-the-spot test, instrument is stable, and measuring accuracy meets technical requirement completely, data communication feature is reliable, simple to operation, there is the function of intelligent adjustment zero point and range, can expand according to demand and add wireless data transmitting function.
Accompanying drawing explanation
Fig. 1 is the composition frame chart of a kind of intelligent stray current tester table of the present invention;
Fig. 2 is the program flow diagram of a kind of intelligent stray current tester table of the present invention.
Embodiment
Below in conjunction with accompanying drawing illustrated embodiment, the invention will be further described.
Intelligence stray current tester table data are obtained conversion value from A/D, and according to systematic parameter judgement sampling type, determine its bound, thereby be converted to net result.Wherein also comprise filtering and correction program, reduce the impact that the drift of circuit noise and element produces measured value as far as possible, thereby obtain precise results.Data module also comprises data storage and read routine, is responsible for the data after conversion to be stored in storage chip, or from wherein reading.In data storage and read routine, there is data checkout routine, to guarantee the correctness of data.Communication slave computer module is for communicating to transmit data with host computer procedure according to the agreement of agreement.Instrument and host computer utilize serial ports to communicate.Send instruction by host computer procedure to program of lower computer, slave computer is carried out instruction and is sent data to host computer according to the form of examining with school.
The task of host computer procedure is to read the data that are stored in instrument, and its form is as requested stored in specific file.In programming, select VB, complete the communication task of instrument by calling MSCOMM control.Transmission data baud rate is not high, and host-host protocol has been used for reference the core concept of the network transmission protocol, can realize school inspection, the several functions such as retry of makeing mistakes, the stability of program and the integrality of data when guaranteeing work.The data that host computer procedure transmits instrument are according to specific format conversion storage, so that analysis provides complete data to pipeline corrosion prediction.
This instrument can gather AC and DC pipe-to-soil potential for continuous 72 hours; Exchange 0-200V, direct current-20--+20V; Intelligence automatic zero point adjustment and span calibration; Free in 0-255 seconds sampling periods; Data storage capacity 4MByte; RS232C serial communication, can, by the data of all collections by communication mode, reach in host computer, and standard data format is provided, in order to late time data processing after test finishes.
Software adopts Keil C microcomputer development Platform Designing, and except the important program segment employing assembly language of minority is write, most programs are by C language compilation.Host computer data processor adopts VB to write.
The mode of operation of instrument is menu mode operation, carries out different operations by choice menus.Main menu comprises: job menu, Time of Day menu, calibration menu, setting menu etc.The menu that master routine is definite according to button, determines a series of functions such as demonstration, input.
The initial work of initialize routine completion system, mainly comprises each device initialization, the initialization of constant and variable, the setting of interruption, the work such as the parameter while reading task.Severe due to working environment for avoiding system in case of system halt, completes restarting while crashing by watchdog chip on hardware, on software, by initialize routine, the zone bit being stored in EEPROM judged to startup type, reads various parameters.If restarting after crashing just reenters sample states automatically; If normally start, just wait for operational order.When system completes after initialization, master routine is with regard to the control of adapter system.
Due to the characteristic of instrument hardware, after work a period of time, will generating device parameter drift, at this moment original fixed calibration point is just no longer accurate, need to again proofread and correct range calibration point.The present invention adopts in two ways and proofreaies and correct, i.e. dynamic calibration and static shift correction.Dynamic calibration is under lowered in field environment, there is no standard source around, and available standards table is measured existing power supply, proofreaies and correct with existing power supply and its measured value; Static shift correction is that full scale signal is added in instrument and is proofreaied and correct.These two kinds of method complementations, to meet user's requirement in use.
Circuit design has taken into full account the abominable of low-power consumption, portability and the working environment of instrument.A large amount of low-power consumption, jamproof devices of adopting on element is selected.Basic circuit design adopts ripe design, makes measuring accuracy, stability and the reliability of instrument reach best.AC signal is delivered to CD4051 by bleeder rectifier circuit, amplifying circuit after amplifying; Direct current signal is also delivered to multicircuit switch CD4051 after dividing potential drop is amplified.CD4051 chooses certain road signal according to the setting of program and delivers to ICL7135.ICL7135 is 14 AD conversion chips, there is the features such as the precision, automatic zero adjustment, auto polarity output, single reference voltage of 4 half, dynamically word bit scanning, binary-coded decimal output and the output of automatic range control signal, ICL7135 changes input signal, by the mode of interrupting, transformation result is sent into single chip computer AT 89C52 and process after EOC.

Claims (5)

1. an intelligent stray current tester table, is characterized in that, described instrumented data is changed from A/D, and according to systematic parameter judgement sampling type, determines its bound, thereby be converted to net result; This instrument is provided with filtering and correction program, its data module comprises data storage and read routine, in data storage and read routine, be provided with data checkout routine, communication slave computer module communicates to transmit data with host computer procedure according to the agreement of agreement, and instrument and host computer utilize serial ports to communicate; Host computer procedure sends instruction to program of lower computer, and slave computer carries out instruction and according to sending data to host computer with the form of school inspection, its circuit AC signal is delivered to CD4051 by bleeder rectifier circuit, amplifying circuit after amplifying; Direct current signal is also delivered to multicircuit switch CD4051 after dividing potential drop is amplified; ICL7135 is 14 AD conversion chips, and ICL7135 changes input signal, by the mode of interrupting, transformation result is sent into single chip computer AT 89C52 and process after EOC.
2. the intelligent stray current tester table of one according to claim 1, is characterized in that, the task of described host computer procedure is to read the data that are stored in instrument, and its form is as requested stored in specific file.
3. the intelligent stray current tester table of one according to claim 2, is characterized in that, the data that described host computer procedure transmits instrument are according to specific format conversion storage, so that analysis provides complete data to pipeline corrosion prediction.
4. the intelligent stray current tester table of one according to claim 1, is characterized in that, described this instrument gathers AC and DC pipe-to-soil potential for continuous 72 hours.
5. the intelligent stray current tester table of one according to claim 1, is characterized in that, described this instrument exchanges 0-200V, direct current-20--+20V.
CN201410006054.9A 2014-01-06 2014-01-06 Intelligent stray current testing instrument Pending CN103792418A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104166042A (en) * 2014-07-28 2014-11-26 中国电子科技集团公司第八研究所 Measuring range self-adaptive current detection fiber transmission system and detection method
CN107656125A (en) * 2017-08-09 2018-02-02 中国船舶重工集团公司第七二五研究所 A kind of seawater stray electrical current in-situ monitoring device
CN108398592A (en) * 2018-03-07 2018-08-14 成都天誉立信科技有限公司 A kind of test method of alternative stray current

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2614347Y (en) * 2003-04-11 2004-05-05 中国矿业大学 On-line monitoring device for stray current of subway
CN201162544Y (en) * 2008-03-01 2008-12-10 吴元峰 Intelligent monitoring instrument for mine stray current
CN202870150U (en) * 2012-10-23 2013-04-10 徐州矿一自动化科技有限公司 Stray current tester

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2614347Y (en) * 2003-04-11 2004-05-05 中国矿业大学 On-line monitoring device for stray current of subway
CN201162544Y (en) * 2008-03-01 2008-12-10 吴元峰 Intelligent monitoring instrument for mine stray current
CN202870150U (en) * 2012-10-23 2013-04-10 徐州矿一自动化科技有限公司 Stray current tester

Non-Patent Citations (2)

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Title
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姜长洪等: "输油管道腐蚀与杂散电流测量", 《管道技术与设备》, no. 01, 29 February 2004 (2004-02-29) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104166042A (en) * 2014-07-28 2014-11-26 中国电子科技集团公司第八研究所 Measuring range self-adaptive current detection fiber transmission system and detection method
CN104166042B (en) * 2014-07-28 2017-03-29 中国电子科技集团公司第八研究所 Range self-adapting current detecting fibre-optic transmission system (FOTS) and detection method
CN107656125A (en) * 2017-08-09 2018-02-02 中国船舶重工集团公司第七二五研究所 A kind of seawater stray electrical current in-situ monitoring device
CN107656125B (en) * 2017-08-09 2019-12-17 中国船舶重工集团公司第七二五研究所 Seawater stray current in-situ monitoring device
CN108398592A (en) * 2018-03-07 2018-08-14 成都天誉立信科技有限公司 A kind of test method of alternative stray current

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Application publication date: 20140514