CN100410671C - Method for on-line monitoring insulating hidden danger of double-pipe for transformer - Google Patents
Method for on-line monitoring insulating hidden danger of double-pipe for transformer Download PDFInfo
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- CN100410671C CN100410671C CNB03124730XA CN03124730A CN100410671C CN 100410671 C CN100410671 C CN 100410671C CN B03124730X A CNB03124730X A CN B03124730XA CN 03124730 A CN03124730 A CN 03124730A CN 100410671 C CN100410671 C CN 100410671C
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Abstract
The present invention relates to a method for on-line monitoring insulating hidden danger of a sleeve pipe for a transformer. The present invention has the technical scheme that the working phase voltage of each phase sleeve pipe and the end screen leakage current are synchronously sampled through working voltage sensors arranged on three-phse six sleeve pipes on high a high voltage side and a medium voltage side and leakage current sensors; dielectric loss and capacitance of each sleeve pipe are worked out; for a collected end screen leakage current values of a high voltage inphase sleeve and a medium voltage inphase sleeve, a corresponding dielectric loss value between the high voltage inphase sleeve and the medium voltage inphase sleeve is worked out according to a calculation method of the dielectric loss; through a signal regulation circuit, an unbalanced voltage value on the high voltage side and the medium voltage side is obtained by the three-phase working voltage on the high voltage side and the medium voltage side; then, the dielectric loss value and the capacitance value of each phase sleeve pipe obtained by calculation and the unbalanced voltage value of a three-phase sleeve on the high voltage side and the medium voltage side are transmitted to a computer of a background diagnosis system in a designated data format through optical cables; unbalanced situations among the inphase sleeve pipes are diagnosed by the background diagnosis system so as to realize the on-line monitoring of insulating medium consumption of a sleeve pipe of a transformer.
Description
Technical field
The present invention relates to a kind of integrated test facility of on-line monitoring bushing shell for transformer insulation dielectric loss, the method of on-line monitoring bushing shell for transformer insulation hidden danger particularly, the application of the invention can improve the dirigibility and the degree of accuracy of measuring transformer sleeve pipe dielectric loss to a great extent.
Background technology
Electric system mesohigh power equipment reliability of operation depends primarily on the insulation status of equipment.For preventing accident, all adopt the preventive trial method regularly the insulation status of high voltage electric power equip ment to be monitored for many years, this has played certain effect to the safe operation that guarantees power equipment and electrical network.But, along with power equipment develops to high capacity, high voltage, high-performance direction, traditional preventive trial because its intrinsic defective (as need have a power failure operation, trial voltage is low, the test period is long etc.), can not adapt to the requirement of electric system.
Along with the development and the application of modern sensor technology, computer technology and the information processing technology, the insulated on-line monitoring technology also becomes better and approaching perfection day by day, and its application in Fault Diagnosis for Electrical Equipment also more and more comes into one's own.With the preventive trial system to set up process the same, by after using, promote, sum up and improving, will make status of electric power inspection standard based on on-line monitoring, progressively set up perfect POWER SYSTEM STATE inspection and repair system.
Capacitive apparatus (sleeve pipe, CT etc., below represent with sleeve pipe) insulation is very important, and it has determined the technical and economic performance and the operational reliability of sleeve pipe.The insulation of sleeve pipe is in operation and is subjected to the effect of electricity, heat and mechanical stress and environmental stress, and its performance can descend gradually, in other words, state of insulation meeting deterioration, the function of final forfeiture insulation, this is called the aging of insulation.The aging of insulation is the process of a gradual change, if untimely discovery just may cause sleeve pipe to break down, even cause paroxysmal electric power accident, causes huge direct and indirect economic loss.In order to understand the state of insulation of sleeve pipe, avoid or reduce because of insulation fault causes and damage and unplanned power failure, it is very necessary carrying out insulating monitoring and diagnosing.
Summary of the invention
The method that the purpose of this invention is to provide a kind of on-line monitoring bushing shell for transformer insulation hidden danger is to solve the weak point that traditional preventive trial exists, to improve the dirigibility and the degree of accuracy of measuring transformer sleeve pipe dielectric loss.
The technical solution adopted in the present invention is: the method for on-line monitoring bushing shell for transformer insulation hidden danger, it is characterized in that by be installed in high-pressure side A, B, C three-phase and medium voltage side Am, Bm, Cm three-phase altogether the operating voltage sensor on the six roots of sensation condenser-type terminal work phase voltage and the end screen leakage current of condenser-type terminal carry out synchronized sampling mutually to each with end screen leakage current sensor; And ask for the dielectric loss and the electric capacity of each capacitive character sleeve pipe; End screen leakage current values to the condenser-type terminal of the high and medium voltage homophase gathered, ask for the relative dielectric loss value between the condenser-type terminal of high and medium voltage homophase according to the computing method of dielectric loss, pass through signal conditioning circuit, by on high-tension side A, B, C three-phase work phase voltage obtains high-pressure side unbalance voltage value, Am by medium voltage side, Bm, Cm three-phase work phase voltage obtains medium voltage side unbalance voltage value, then with the dielectric loss value of each phase condenser-type terminal of being calculated and capacitance and by measuring the high-pressure side A that obtains, B, C three-phase Capacitor sleeve pipe unbalance voltage value, medium voltage side Am, Bm, Cm three-phase Capacitor sleeve pipe unbalance voltage value is transferred in the computing machine of backstage diagnostic system by optical cable with the data designated form, diagnose out the unbalance condition of asking of homophase condenser-type terminal by the backstage diagnostic system, to realize on-line monitoring to the bushing shell for transformer insulation dielectric loss.
The present invention can on-line monitoring the bushing shell for transformer insulation dielectric loss so that in time the state of insulation of sleeve pipe is monitored, avoid or reduce damage and the unplanned power failure that causes because of insulation fault.The invention solves the deficiency that traditional preventive trial exists, improved the dirigibility and the degree of accuracy of measuring transformer sleeve pipe dielectric loss.
Description of drawings
Fig. 1 is the front view of transformer of the present invention.
Embodiment
Among Fig. 1:
The 1-transformer high-voltage side A plumber that is nested makes voltage sensor;
2-transformer high-voltage side A phase bottom shielding of bushing current sensor;
The 3-transformer high-voltage side B plumber that is nested makes voltage sensor;
4-transformer high-voltage side B phase bottom shielding of bushing current sensor;
The 5-transformer high-voltage side C plumber that is nested makes voltage sensor;
6-transformer high-voltage side C phase bottom shielding of bushing current sensor;
The 7-transformer high-voltage side Am plumber that is nested makes voltage sensor;
8-transformer high-voltage side Am phase bottom shielding of bushing current sensor;
The 9-transformer high-voltage side Bm plumber that is nested makes voltage sensor;
10-transformer high-voltage side Bm phase bottom shielding of bushing current sensor;
The 11-transformer high-voltage side Cm plumber that is nested makes voltage sensor;
12-transformer high-voltage side Cm phase bottom shielding of bushing current sensor;
13-transformer condenser-type terminal.
The present invention will be further described below in conjunction with accompanying drawing.
The content of the method for on-line monitoring bushing shell for transformer insulation hidden danger of the present invention comprises measuring calculates high-pressure side A, B, C three-phase and medium voltage side Am, Bm, Cm the three-phase dielectric loss and the electric capacity of totally 6 capacitive character covers 13, and to the relative dielectric loss of high-pressure side with medium voltage side homophase capacitive character sleeve pipe, and the unbalance voltage of high-pressure side and medium voltage side three-phase electricity capacitive sleeve pipe is faced survey.For a capacitive character sleeve pipe 13, want to calculate its dielectric loss, must measure the waveform of the end screen leakage current of the work phase voltage of this capacitive character sleeve pipe and this capacitive character sleeve pipe earlier.
1, high-pressure side condenser-type terminal insulated on-line monitoring:
By be installed in operating voltage sensor 1,3,5 on high-pressure side A, B, the C three-phase Capacitor sleeve pipe and end screen current sensor 2,4,6 couples of high-pressure side A, B, C each the work phase voltage and the end screen leakage current of condenser-type terminal carry out synchronized sampling mutually, be A phase operating voltage with A mutually the end screen leakage current of capacitive character sleeve pipe carry out synchronized sampling, B phase operating voltage and B the end screen leakage current of capacitive character sleeve pipe mutually carry out synchronized sampling, and C phase operating voltage and C the end screen leakage current of capacitive character sleeve pipe mutually carry out synchronized sampling and get final product; Be convenient disposal, system also can carry out synchronized sampling to these 6 parameters.
Wherein the operating voltage signal derives from PT or CVT, and the output area of its signal is: exchange 0-100V.
The scope of the end screen leakage current signal of capacitive character sleeve pipe is: exchange 0-30mA.
By the end screen ground outlet of each capacitive character sleeve pipe, cover connects the end screen leakage current that core-theaded type end screen current sensor 2,4,6 just can be measured this capacitive character sleeve pipe.It should be noted that the synchronism that to guarantee that each capacitive character casing signals is gathered.
2, medium voltage side condenser-type terminal insulated on-line monitoring:
By be installed in operating voltage sensor 7,9,11 on medium voltage side Am, Bm, the Cm three-phase Capacitor sleeve pipe and end screen current sensor 8,10,12 couples of medium voltage side Am, Bm, Cm each the work phase voltage and the end screen leakage current of condenser-type terminal carry out synchronized sampling mutually, be Am phase operating voltage with Am mutually the leakage current of sleeve pipe carry out synchronized sampling, Bm phase voltage and the Bm leakage current of sleeve pipe mutually carry out synchronized sampling, and Cm phase voltage and the Cm leakage current of sleeve pipe mutually carry out synchronized sampling and get final product; Be convenient disposal, system also can carry out synchronized sampling to these 6 parameters.
Wherein the operating voltage signal derives from PT or CVT, and the output area of its signal is: exchange 0-100V.
The scope of the end screen leakage current signal of sleeve pipe is: exchange 0-30mA.
By the end screen ground outlet of each capacitive character sleeve pipe, cover connects the end screen leakage current that core-theaded type end screen current sensor 8,10,12 just can be measured this capacitive character sleeve pipe.It should be noted that the synchronism that to guarantee that each casing signals is gathered.
3, the measurement of comparison of dielectric loss between height, middle pressure three-phase sleeve pipe:
By above-mentioned end screen current sensor 2,4,6,8,10,12,6 end screen leakage currents of synchro measure high and medium voltage three-phase electricity capacitive sleeve pipe.End screen leakage current to the high and medium voltage homophase, it is the Am Bm Cm capacitive character bottom shielding of bushing electric current mutually of capacitive character bottom shielding of bushing electric current and on high-tension side C phase capacitive character bottom shielding of bushing electric current and medium voltage side mutually of capacitive character bottom shielding of bushing leakage current, on high-tension side B phase capacitive character bottom shielding of bushing electric current and medium voltage side mutually of on high-tension side A phase capacitive character bottom shielding of bushing leakage current and medium voltage side, ask for relative dielectric loss value between the two according to the computing method of dielectric loss, thereby reflect the unbalance condition between the homophase sleeve pipe.According to the requirement of backstage diagnostic system, correlation is transmitted with the data designated form by optical cable at last.
The scope of the end screen leakage current signal of capacitive character sleeve pipe is: exchange 0-30mA.
4, condenser-type terminal insulated on-line monitoring overall technology requires:
During for on-line monitoring bushing shell for transformer insulation hidden danger, the acquisition rate on each road all requires to be not less than 150kHz; The fluctuation of considering mains frequency will cause dielectric loss measurement and seriously influence, and the present invention can follow the tracks of the fluctuation of mains frequency by software or hardware mode design phase-locked loop circuit, realizes sampling under different frequency exactly.When finishing the total system self check, the phase shift that the hardware circuit that check system comprised causes the project of the present invention monitoring, and revise by system software;
Present embodiment requires relative error≤± 0.5% of busbar voltage; Relative error≤± 0.5% of end screen leakage current; The relative error of current in resistance property≤± 5.0%; The absolute error of dielectric loss measurement≤± 0.1%; The relative error of equivalent capacitance≤± 1.0%; Require the acquisition rate of each road signal to be not less than 150kHz.
5, the on-line monitoring of three-phase sleeve pipe unbalance voltage:
By above-mentioned end screen current sensor 2,4,6,8,10,12 high-pressure sides that measure, the end screen leakage current of medium voltage side three-phase electricity capacitive sleeve pipe, respectively by add behind the resistance and, then through a resistance eutral grounding, rely on operating voltage sensor 1,3,5,7,9,11 magnitudes of voltage of measuring these resistance two ends reflect the unbalanced situation of three-phase electricity capacitive sleeve pipe, be high-pressure side A, B, C three-phase hardware add and after, obtain high-pressure side three-phase electricity capacitive sleeve pipe unbalance voltage value, medium voltage side Am, Bm, Cm three-phase hardware add and after, obtain medium voltage side three-phase electricity capacitive sleeve pipe unbalance voltage value.And the requirement according to the backstage diagnostic system is transmitted by optical cable these two magnitudes of voltage with the data designated form.
Require each Kuai Yan number acquisition rate to be not less than 10kHz; Relative error≤± 5.0%.
Claims (3)
1. the method for on-line monitoring bushing shell for transformer insulation hidden danger, it is characterized in that by be installed in high-pressure side A, B, C three-phase and medium voltage side Am, Bm, Cm three-phase altogether the operating voltage sensor (1,3,5,7,9,11) on the six roots of sensation condenser-type terminal and end screen leakage current sensor (2,4,6,8,10,12) the work phase voltage of condenser-type terminal and end are shielded leakage current and are carried out synchronized sampling mutually to each; And ask for the dielectric loss and the electric capacity of each sleeve pipe; End screen leakage current values to the condenser-type terminal of the high and medium voltage homophase gathered, ask for the relative dielectric loss value between the condenser-type terminal of high and medium voltage homophase according to the computing method of dielectric loss, pass through signal conditioning circuit, by on high-tension side A, B, C three-phase work phase voltage obtains high-pressure side unbalance voltage value, Am by medium voltage side, Bm, Cm three-phase work phase voltage obtains medium voltage side unbalance voltage value, then with the dielectric loss value of each phase condenser-type terminal of being calculated and capacitance and by measuring the high-pressure side A that obtains, B, C three-phase Capacitor sleeve pipe unbalance voltage value, medium voltage side Am, Bm, Cm three-phase Capacitor sleeve pipe unbalance voltage value is transferred in the computing machine of backstage diagnostic system by optical cable with the data designated form, diagnose out unbalance condition between the homophase condenser-type terminal by the backstage diagnostic system, to realize on-line monitoring to the bushing shell for transformer insulation dielectric loss.
2. the method for on-line monitoring bushing shell for transformer insulation hidden danger according to claim 1 is characterized in that described work phase voltage signal derives from PT, and the output area of its signal is: exchange 0-100V; The scope of the end screen leakage current signal of capacitive character sleeve pipe is: exchange 0-30mA.
3. the method for on-line monitoring bushing shell for transformer insulation hidden danger according to claim 1 and 2 is characterized in that the acquisition rate of each road signal is not less than 150kHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB03124730XA CN100410671C (en) | 2003-08-09 | 2003-08-09 | Method for on-line monitoring insulating hidden danger of double-pipe for transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB03124730XA CN100410671C (en) | 2003-08-09 | 2003-08-09 | Method for on-line monitoring insulating hidden danger of double-pipe for transformer |
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| CN1580794A CN1580794A (en) | 2005-02-16 |
| CN100410671C true CN100410671C (en) | 2008-08-13 |
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| CNB03124730XA Expired - Fee Related CN100410671C (en) | 2003-08-09 | 2003-08-09 | Method for on-line monitoring insulating hidden danger of double-pipe for transformer |
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Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101846719B (en) * | 2009-11-25 | 2012-05-09 | 西安博源电气有限公司 | Transformer insulation state on-line monitoring device |
| CN101793936A (en) * | 2010-02-11 | 2010-08-04 | 河南省电力公司商丘供电公司 | Insulation state online monitoring method for condenser type bushings |
| CN101944719B (en) * | 2010-08-20 | 2013-01-16 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Detection system and detection method of capacitance sleeve pipe |
| CN102346230B (en) * | 2011-09-21 | 2014-04-09 | 山东五岳电器有限公司 | Method and device for online detection of transformer sleeve |
| CN102628905A (en) * | 2012-04-20 | 2012-08-08 | 北京诺德威电力技术开发有限责任公司 | Fault recognition device of high-voltage capacitance type equipment and application device thereof |
| CN102866304B (en) * | 2012-09-18 | 2014-12-24 | 云南电力试验研究院（集团）有限公司电力研究院 | Current phasor group-based online insulation monitoring method for high-voltage power capacitive equipment |
| CN103267912B (en) * | 2013-04-27 | 2015-12-23 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of direct current transportation wall bushing risk evaluating system and methods of risk assessment |
| CN104297592B (en) * | 2014-10-09 | 2017-06-23 | 广西电网公司电力科学研究院 | A kind of split type Transformer Insulation signal cluster sampling device of three-phase |
| CN106940415B (en) * | 2017-02-07 | 2020-09-25 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Detection system for capacitive bushings with measurement terminal and end screen grounding terminal |
| CN106872865A (en) * | 2017-03-06 | 2017-06-20 | 云南电网有限责任公司电力科学研究院 | Casing high pressure experimental system in kind under a kind of load temperature |
| CN110208607B (en) * | 2019-07-05 | 2021-07-13 | 杭州西湖电子研究所 | Method for detecting relative capacitance ratio |
| CN111579878B (en) * | 2020-05-26 | 2022-08-19 | 广东电网有限责任公司 | Capacitive equipment online monitoring method based on multi-source data analysis |
| CN112684261B (en) * | 2020-12-17 | 2021-10-19 | 广东电网有限责任公司电力科学研究院 | Transformer bushing state monitoring method and device |
| CN116223998B (en) * | 2023-05-08 | 2023-08-22 | 四川省菁蓉和欣科技有限公司 | Acoustic-electric combined positioning method for partial discharge inside large transformer |
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