CN101655469A - Intelligent transformer substation grounding network anti-corrosion and monitoring system - Google Patents
Intelligent transformer substation grounding network anti-corrosion and monitoring system Download PDFInfo
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- CN101655469A CN101655469A CN200910023992A CN200910023992A CN101655469A CN 101655469 A CN101655469 A CN 101655469A CN 200910023992 A CN200910023992 A CN 200910023992A CN 200910023992 A CN200910023992 A CN 200910023992A CN 101655469 A CN101655469 A CN 101655469A
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Abstract
The invention discloses an intelligent transformer substation grounding network anti-corrosion and monitoring system, which is composed of a constant potential rectifier, a corrosion on-line detectionsensor, a temperature and humidity sensor, an isolation amplifier, an analog-to-digital converter, a single chip device, an upper computer, a 3G data and image transmission unit, a remote detection client and the like; the signals transmitted by the constant potential rectifier, the corrosion on-line detection sensor and the temperature and humidity sensor are isolated and amplified by the isolation amplifier, enters into the analog-to-digital converter for A/D conversion, the result is converted and transmitted to the single chip to be transmitted to the upper computer, the 3G data and imagetransmission unit, and the remote detection client. The system can achieve the aims of effectively mitigating corrosion on the grounding network, prolonging service life of the grounding network andremote monitoring in real time.
Description
Technical field
The present invention relates to a kind of anticorrosive metal and supervisory system, the impressed current cathodic protection, the corrosion that particularly relate to a kind of grounding net of transformer substation detect and wireless remote control system.
Background technology
Grounding net of transformer substation is the indispensable facility that is used for working earthing, lightning protection, protective ground, is the important step of guaranteeing the person, equipment, security of system, and it plays a part earial drainage and all press at anti-thunder and lightning, static and fault current.Along with the development of ehv power transmission, it is more obvious that the importance of grounded screen highlights.Yet the harm that ground net corrosion brings is huge, directly causes the grounded screen cross section to reduce, even fracture.Cause monitoring or opertaing device generation malfunction or tripping indirectly and the expansion accident, in addition damage equipment, the expansion accident, it is stable to destroy the electrical network device, brings enormous economic loss and bad social influence.
The patent No. is that 200720029110.6 utility model patent is mentioned a kind of intelligent frequency-conversion potentiostat, is made up of industrial control unit (ICU) and a plurality of high-frequency DCs source, it is characterized in that described industrial control unit (ICU) is used to control the output valve size in a plurality of high-frequency DCs source; Industrial control unit (ICU) mainly is core with the single-chip microcomputer, constitutes scm observe and control management integration device, finishes detection, demonstration, printing, fault alarm to whole anti-corrosion meter with this, and the major loop signal is controlled automatically.Adopting cathodic protection for grounding net of transformer substation is a kind of means of corroding of effectively preventing, but there is the very poor shortcoming of function singleness and communication function in above-mentioned intelligent frequency-conversion potentiostat and existing similar products.Often after the operation of the intelligent frequency-conversion potentiostat of separate unit, be subjected to the influence of factors such as weather, bigger fluctuation often takes place in potentiostat output, and ignore unusually or mistake is handled by professional knowledge owing to not possessing for common person on duty; In addition, high voltage substation is remote usually, and the technical specialist does not have real-time data, can not in time find to move the unusual of existence, also can't adjust operating condition, makes that conventional impressed current catholic protection device result of use is relatively poor.The patent No. is that 200720062504.1 utility model patent is mentioned a kind of transmission transformer station grounded screen on-line measuring device.This utility model discloses a kind of transmission transformer station grounded screen on-Line Monitor Device, comprise state sensor, signal source, gauge tap, comparison amplifier, operational amplifier 1, power amplifier, operational amplifier 2, operational amplifier 3, operational amplifier 4, differential amplifier, electric resistance measuring apparatus, converter A/D1, converter A/D2, converter A/D3, converter A/D4, single-chip microcomputer, converter D/A1, converter D/A2, wave filter, optoelectronic switch, the square-wave signal of described signal source output is added between the auxiliary electrode and research electrode of state sensor, the electric current that measurement is flow through, the data of measuring are delivered to microprocessor after filtering, the corrosion rate of calculating sensor electrode and the corrosion depth of grounded screen and electric property parameter are judged the security performance of grounded screen according to calculating gained grounded screen electric property parameter.Its shortcoming is that soil corrosion speed is slower, and wave filter filters small and weak signal easily, sensor acquisition be that noise or false data are very big to reality corrosion effect of signals, make that measuring corrosion speed is not actual corrosion speed; The state sensor of this device is connected with grounded screen, and the corrosion speed during the grounded screen earial drainage causes its duty significantly different with actual grounded screen greater than the speed of independent soil corrosion; Though this device adopts a plurality of state sensors to characterize the corrosion condition of whole grounded screen, and has adopted the calculating of transient state and stable state, various places soil property difference causes between its calculated value and the actual value error bigger.Parameter such as grounded screen protection electric current and voltage is closely related with environmental baseline in addition, for example rainy day and arid season, and protection potential, protective current will change, and above-mentioned patent does not consider that all environmental baseline protects the influence of parameter to corruption.
Summary of the invention
The invention provides a kind of intelligent transformer substation grounding network anti-corrosion and supervisory system, this system can reach effectively slow down ground net corrosion, prolong grounded screen serviceable life, the real-time remote monitoring purpose.
The present invention can draw the cathodic protection intelligent power of cathodic protection polarization curve, regulates electrical quantitys such as protection potential automatically according to the protection potential on the cathodic protection curve; The ground net corrosion velocity measurement sensor is connected with grounded screen, just moment disconnects when measuring, be in connection status when not measuring, corrosion speed calculate be with local soil be the value of benchmark actual measurement as foundation, adopt four-point method resistance instrument to carry out the conversion of resistance multiplying power and corrosion speed; Carry out data transmission by 3G technology, can guard and control guard mode, etch state at Central Control Room or remote expert office.The object of the present invention is to provide a kind of intelligent transformer substation grounding network special anti-corrosion erosion and supervisory system; this system possesses the cathodic protection of grounded screen impressed current, the online detection of ground net corrosion degree and based on the parameter of 3G technology and the wireless transmission function three big functions of image.
Technical scheme of the present invention is achieved in that
This system is made up of potentiostat, corrosion on-line detector, Temperature Humidity Sensor, isolated amplifier, analog to digital converter, Single Chip Microcomputer (SCM) system, host computer, 3G data and image transmission transmitter unit, remote detection client etc.Its connected mode be the signal that sends of potentiostat, corrosion on-line detector, Temperature Humidity Sensor through isolate through isolated amplifier amplify after, enter analog to digital converter and carry out the A/D conversion and result's conversion is sent to single-chip microcomputer, send to host computer and 3G data and image respectively by single-chip microcomputer again and transmit transmitter unit, remote detection client.
Described corrosion detecting line sensor comprises steel plate, is connected to terminal at the steel plate two ends, the wide 40-60mm of its light plate, and thick 2-6mm, long is 4-6m.
Have reversing switch to be connected between resistance measurement sensor and the grounded screen, reversing switch and grounded screen disconnect during measurement, and reversing switch is connected with grounded screen during operation; Four point measurements are to be benchmark with local soil corrosion speed and resistance multiplying power, have guaranteed the accuracy of measurement data.
Carry out data transmission by 3G technology, can carry out long distance monitoring and control guard mode, etch state.
Possesses the function that the grounded screen humiture is measured.
The present invention has realized the automatic adjusting of protection potential, makes the impressed current cathodic protection current potential be in the best protection current potential all the time, overprotection and state under proteciton can not occur.The protection degree that makes grounded screen is about 90%, and the life-span prolongs about 8 times; By the resistance of local soil actual measurement and the pass of corrosion speed is benchmark, is grounded the online detection of net extent of corrosion, is convenient to the technician and understands the corrosion present situation; All detected parameters and image make things convenient for technical specialist and managerial personnel to understand the safety and the operational factor of equipment by the 3G wireless transmission; And the whole system operation state can be adjusted to the best.
Description of drawings
Fig. 1 is annexation figure of the present invention;
Fig. 2 is the sample graph of cathodic protection polarization curve of the present invention and protection potential;
Fig. 3 is the work synoptic diagram of corrosion detecting line sensor;
Below in conjunction with accompanying drawing content of the present invention is described in further detail.
Embodiment
The present invention combine closely the geographic position characteristics of transformer station and the defective of prior art based on potentiostat, are data processing tools with the computing machine; Develop online measuring ability on this basis, the online measuring ability of environmental baseline, data acquisition and processing capacity, the intelligent transformer substation grounding network special anti-corrosion erosion cathodic protection system of 3G data and image wireless transfer function with ground net corrosion degree.
With reference to shown in Figure 1, this system is made up of potentiostat, corrosion on-line detector, Temperature Humidity Sensor, isolated amplifier, analog to digital converter, computing machine, host computer, 3G data and image transmission transmitter unit, remote detection client etc.Its connected mode be the signal that sends of potentiostat, corrosion on-line detector, Temperature Humidity Sensor through isolate through isolated amplifier amplify after, enter that analog to digital converter carries out A/D conversion and the result transformed and send on the computing machine, send to host computer respectively by single-chip microcomputer again and the 3G data are transmitted transmitter unit, remote detection client with image.
Wherein potentiostat has constant voltage, continuous current, three kinds of mode of operations of constant potential; potentiostat detects electric current, voltage signal by three-electrode system; be transferred to computing machine by amplifier; calculate function and draw polarization curve automatically; can automatic mistake find out protection potential as Fig. 2 computing machine, i.e. A point current potential can regularly be drawn 2 times polarization curve every day by program design; guarantee in Changes in weather the automatic adjusting of protection potential like this.Overprotection and under proteciton can not occur, realize that the protection degree reaches 90%.The monitoring target of corrosion monitor is to get actual grounded screen material to get 3m long, is embedded in the grounded screen gap, between it and the grounded screen reversing switch is arranged, during detection, disconnect with grounded screen, detection finishes and is connected with grounded screen, guarantees that the state of monitoring is identical with the etch state of actual grounded screen; Measure in the value that the locality is carried out between soil corrosion and the resistance multiplying power before the signal Processing.This measured value is deposited in the computer software, as the calculating benchmark of corrosion speed.What Temperature Humidity Sensor reacted is the temperature and humidity of soil, and under the different temperature humidity, the corrosion potential of grounded screen has very big-difference.Adjust the potentiostat output current according to different temperature humidity, reach best protection effect; 3G wireless data and image transmission transmitter unit has the collection and the processing capacity of data and image, and sends image and data to the remote detection client by emission coefficient.
With reference to shown in Figure 3, the corrosion detecting line sensor adopts to be made with the metal of the identical material of grounded screen band steel, between grounded screen and corrosion measurement sensor reversing switch is arranged, and during detection, reversing switch is squeezed into detection.Then disconnect with former grounded screen, squeeze into operation, the reversing switch amount is gone into and the grounded screen connection status.Adopt four-end method to measure conductor resistance, promptly current terminal 1 and the current terminal 2 at measured conductor adds a current signal, the voltage difference of measuring between the conductors of two ends at voltage end 1 and voltage end 2, thus measure the conductor resistance of its grounded screen.
Grounding net of transformer substation the erosion of this intelligence grounded screen special anti-corrosion is installed and the supervisory system course of work as follows:
At first lay the corrosion measurement sensor and the relation of the multiplying power of the corrosion of local soil and resistance is measured, then parameters is carried out correcting measuring, comprise reference potential, voltage and current, humiture, resistance etc.; Secondly above-mentioned parameter carries out analyzing and processing through isolated amplifier, analog to digital converter, single-chip microcomputer, shows at host computer according to certain calculation method, controls output current, voltage and the current potential of potentiostat simultaneously; Data after will handling at last and image 3G wireless data and image transmission transmitter unit are launched, and accept processing by the remote detection client, in the long-range purpose that detects and control that reaches.
When the temperature humidity of system changed, system was through computing adjustment output, thereby the work that guarantees is in optimum condition.
This cover system is applied at present at the scene, measures interface such as Fig. 4.Measuring the corrosion speed in somewhere, Shaanxi and the pass of resistance is
On Dec 22nd, 2008, output voltage, output current, output potential be respectively 5.1V, 5.8A ,-0.93V; On January 14th, 2009, the locality water of irrigating the fields immerses grounded screen, and output voltage, output current, output potential are adjusted in the automatic computing of this system, adjust output voltage, output current, output potential be respectively 2.7V, 3.3A ,-0.97V.July 22 days to 2009 Dec in 2008, the resistance multiplying power of measuring between 1.029-1.03, excavate grounded screen in July, 2009 after, do not find that grounded screen has evidence of corrosion, surface condition with imbed before no significant change; Show that the native system protection is respond well, the corrosion rate of resistance measurement is accurate.
Claims (3)
1, intelligent transformer substation grounding network anti-corrosion and supervisory system, this system is by potentiostat, the corrosion detecting line sensor, Temperature Humidity Sensor, isolated amplifier, analog to digital converter, single chip computer device, host computer, 3G data and image transmission transmitter unit, compositions such as remote detection client, it is characterized in that, potentiostat, the corrosion detecting line sensor, the signal that Temperature Humidity Sensor sends is after isolating amplification through isolated amplifier, enter analog to digital converter and carry out the A/D conversion and result's conversion is sent to single-chip microcomputer, send to host computer and 3G data and image transmission transmitter unit respectively by single-chip microcomputer again, the remote detection client.
According to claims 1 described intelligent transformer substation grounding network anti-corrosion and supervisory system, it is characterized in that 2, described corrosion detecting line sensor comprises steel plate, is connected to terminal at the steel plate two ends, the wide 40-60mm of its light plate, thick 2-6mm, long is 4-6m.
3, intelligent transformer substation grounding network anti-corrosion according to claim 1 and supervisory system is characterized in that, have reversing switch to be connected between resistance measurement sensor and the grounded screen.
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| CN200910023992A CN101655469A (en) | 2009-09-22 | 2009-09-22 | Intelligent transformer substation grounding network anti-corrosion and monitoring system |
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| CN200910023992A CN101655469A (en) | 2009-09-22 | 2009-09-22 | Intelligent transformer substation grounding network anti-corrosion and monitoring system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102290644A (en) * | 2011-07-06 | 2011-12-21 | 山东电力研究院 | Tubular grounding network |
| CN103630942A (en) * | 2013-11-21 | 2014-03-12 | 国网河南省电力公司建设管理中心 | Magnetic flux detection-based earth screen state comprehensive evaluation system |
| CN104777402A (en) * | 2015-04-10 | 2015-07-15 | 国家电网公司 | Corrosion state diagnosis and prevention method for grounding grid |
| CN107144494A (en) * | 2017-06-14 | 2017-09-08 | 深圳供电局有限公司 | Digging-free formula grounding net of transformer substation extent of corrosion monitoring device and method based on air pressure change |
| CN110850231A (en) * | 2019-11-07 | 2020-02-28 | 中铁电气化局集团有限公司 | Ground grid safety real-time analysis method and system applied to railway traction substation |
| CN111458285A (en) * | 2020-05-13 | 2020-07-28 | 广东海洋大学 | Metal material anti-corrosion equipment and use method |
| CN114325469A (en) * | 2021-12-14 | 2022-04-12 | 国网江西省电力有限公司电力科学研究院 | Grounding grid direct current interference corrosion monitoring system |
-
2009
- 2009-09-22 CN CN200910023992A patent/CN101655469A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102290644A (en) * | 2011-07-06 | 2011-12-21 | 山东电力研究院 | Tubular grounding network |
| CN103630942A (en) * | 2013-11-21 | 2014-03-12 | 国网河南省电力公司建设管理中心 | Magnetic flux detection-based earth screen state comprehensive evaluation system |
| CN104777402A (en) * | 2015-04-10 | 2015-07-15 | 国家电网公司 | Corrosion state diagnosis and prevention method for grounding grid |
| CN107144494A (en) * | 2017-06-14 | 2017-09-08 | 深圳供电局有限公司 | Digging-free formula grounding net of transformer substation extent of corrosion monitoring device and method based on air pressure change |
| CN110850231A (en) * | 2019-11-07 | 2020-02-28 | 中铁电气化局集团有限公司 | Ground grid safety real-time analysis method and system applied to railway traction substation |
| CN111458285A (en) * | 2020-05-13 | 2020-07-28 | 广东海洋大学 | Metal material anti-corrosion equipment and use method |
| CN114325469A (en) * | 2021-12-14 | 2022-04-12 | 国网江西省电力有限公司电力科学研究院 | Grounding grid direct current interference corrosion monitoring system |
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Inventor after: Yan Aijun Inventor after: Ma Su Inventor after: Wang Sen Inventor after: Feng Lajun Inventor after: Guo Anxiang Inventor after: Xue Jun Inventor before: Yan Aijun Inventor before: Ma Su Inventor before: Wang Sen Inventor before: Feng Lajun Inventor before: Guo Anxiang Inventor before: Xue Jun |
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Application publication date: 20100224 |