CN102539979A - Method for evaluating inner insulation performance of monolithic suspension insulator by testing direct-current leaked currents - Google Patents
Method for evaluating inner insulation performance of monolithic suspension insulator by testing direct-current leaked currents Download PDFInfo
- Publication number
- CN102539979A CN102539979A CN2012100263652A CN201210026365A CN102539979A CN 102539979 A CN102539979 A CN 102539979A CN 2012100263652 A CN2012100263652 A CN 2012100263652A CN 201210026365 A CN201210026365 A CN 201210026365A CN 102539979 A CN102539979 A CN 102539979A
- Authority
- CN
- China
- Prior art keywords
- insulator
- current
- direct
- leakage
- shielding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Testing Relating To Insulation (AREA)
Abstract
Provided is a method for evaluating inner insulation performance of a monolithic suspension insulator by testing direct-current leaked currents, which comprises the steps of first establishing a direct-current leakage current testing system: utilizing a direct-current generator to serve as a test power supply, utilizing a connecting wire to add direct-current high voltage to two ends of the insulator, and connecting a microammeter for measurement into the system; then utilizing shielding measures to shield leaked currents on the surface of the insulator: arranging a shielding ring on an insulation material of a tested insulator and enabling the shielding ring not to have any contact with a metal bowl head of the insulator; connecting a shielding line of equal potential onto the shielding ring; after voltage adding, enabling the leaked currents on the surface of the insulator to pass through the shielding ring to perform short current but not to flow through the microammeter; and then performing voltage raising test: raising the voltage of the direct-current generator, enabling the microammeter to read the leaked currents in the insulator, and when large leaked currents appear, determining inner insulation defects exit in the insulator. The method for evaluating the inner insulation performance of the monolithic suspension insulator by testing the direct-current leaked currents can achieve evaluation on the inner insulation performance of the monolithic suspension insulator, has the advantages of being simple and easy to implement, high in sensitivity and good in measurement repeatability, and can serve as one of basic detection methods for detecting the insulation performance of the suspension insulator.
Description
Technical field
The invention belongs to the insulator performance estimating method, especially insulation appraisal procedure technical field in the monolithic suspended insulator.
Background technology
The various insulator of transmission line of electricity is under long-term electric and mechanical load function, and part can characterize for direct dominance with outward appearance breakage, insulating property forfeiture, and more is the part forfeiture or the deterioration in various degree of the various performances of insulator.For guaranteeing the safe and reliable operation of network system, need the utilization effective means to detect the insulator of these deteriorations.To the insulator performance detection, the main at present method of using has insulation measurement, voltage distribution, infrared detecting method etc.Insulation measurement is to measure insulator dielectric resistance through megohmmeter; Method is comparatively simple and convenient; But the size of the insulating resistance value of surveying is relevant with structure, the volume of insulating material; Relevant, also relevant with the voltage height of used megohmmeter with atmospheric conditions, therefore can not judge the quality of insulation simply with the size of insulation resistance.The voltage method of fractional steps is insulator voltage to be distributed measure, and measurement result is calculated, and judges the insulator performance according to result of calculation.This method is calculated comparatively complicated, and only comparatively effective for detecting zero resistance insulator.Infrared detecting method is to judge through insulator infrared imaging result, and method is influenced by meteorological condition, extraneous thermal source interference etc., can not accurately judge.Above-mentioned these methods all can not be accurate, quantitative the assessment insulator in insulating property.
Summary of the invention
The objective of the invention is to solve the deficiency of prior art; Proposition is built a cover monolithic suspended insulator dc leakage-current test macro through devices such as dc generator, microampere meter, connection lead and shading rings; Through the test of dc leakage-current, realize the identification of deterioration monolithic suspended insulator and the method for judgement.
The objective of the invention is to realize through following technical scheme.
A kind of method of testing insulating property deterioration in the dc leakage-current assessment monolithic suspended insulator, it carries out according to the following steps:
(1) builds insulator dc leakage-current test macro: utilize dc generator to connect lead high direct voltage is added to the insulator two ends, seal in measuring microampere meter in the system as the experiment power supply utilization;
(2) take shielding measure shielding insulation sub-surface leakage current: shading ring is placed by on the insulating material of examination insulator, any contact do not arranged with the metal bowl head of insulator; Equipotential shielding line is received on the shading ring; Pressurization back insulator surface leakage current does not flow through microampere meter through the shading ring short circuit;
(3) test of boosting: rising dc generator voltage, obtain insulator internal leakage size of current by the microampere meter reading of connecting system, when big leakage current occurring, judge insulator exist in insulation defect.
Principle of the present invention is: the current i that flows through insulator under the high direct voltage U can be considered by three parts and constitutes: i
1Capacitance current, i
2ABSORPTION CURRENT, i
3Leakage current i=i
1+ i
2+ i
3i
1And i
2After after a while, go to zero, this moment, i leveled off to i
3, be R=U/i and insulation resistance is exactly the ratio of DC voltage that is added on test product and the leakage current that flows through test product
3, therefore through test i
3The insulating property that can reflect insulator.
Flow through the leakage current i of insulator
3Comprise surface current and volume electric current, and the volumetric leak electric current could really reflect insulating property in the insulator, therefore surface leakage current shielded elimination.
The invention has the beneficial effects as follows: realized qualitative assessment insulating property in the monolithic suspended insulator; Because test method is simple and practical; Therefore no matter highly sensitive, measuring repeatability is good, the detection to insulating in the postrun insulator; Still the examination of new insulator, direct current leakage test should can be used as effective auxiliary detection means and add and give utilization.Still there are not at present the insulating property of using this class methods assessment monolithic suspended insulator.
The inventive method is simple and practical, and is highly sensitive, and measuring repeatability is good, and the therefore no matter detection to insulating in the postrun insulator, the still examination of new insulator, direct current leakage test should can be used as effective auxiliary detection means and add and give utilization.
Description of drawings
Fig. 1 is a monolithic suspended insulator dc leakage-current measurement system diagram;
Fig. 2 is by examination insulator vertical view.
Among the figure, the 1-dc generator, the 2-microampere meter, the 3-shading ring, the 4-insulator, 5-connects lead, 6-shielding line, 7-insulator bowl head, 8-insulator pin, 9-ground.
Embodiment
A kind of method of testing insulating property in the dc leakage-current assessment monolithic suspended insulator, method step is following:
(1) builds the dc leakage-current test macro: utilize dc generator as experiment power supply, utilize the connection lead that high direct voltage is added to the insulator two ends, seal in measuring microampere meter in the system;
(2) take shielding measure shielding insulation sub-surface leakage current: shading ring is placed by on the insulating material of examination insulator, any contact do not arranged with the metal bowl head of insulator; Equipotential shielding line is received on the shading ring; Pressurization back insulator surface leakage current does not flow through microampere meter through the shading ring short circuit;
(3) test of boosting: rising dc generator voltage, obtain insulator internal leakage size of current by the microampere meter reading of connecting system, when big leakage current occurring, judge insulator exist in insulation defect.
See Fig. 1, Fig. 2, insulator dc leakage-current test macro is built: test macro by dc generator 1, microampere meter 2, shading ring 3, try insulator 4, connection lead 5, shielding line 6,9 constitute.Utilize connection lead 5 that the high-pressure side of dc generator is linked to each other with quilt examination insulator metal bowl head 7; Shading ring 3 is placed by on the insulating material of examination insulator 4, any contact do not arranged with the metal bowl head 7 of insulator; Equipotential shielding line 6 is received on the shading ring 3; Utilize the connection lead to link to each other with ground respectively with the dc generator earthing pole and by the examination insulator pin.
Rising dc generator voltage forms two current paths on insulator: the one, from dc generator 1 through microampere meter 2, insulator bowl 7, insulator pin 9 to ground 9, promptly flow through insulator inside; Another be from dc generator 1 through shielding line 6 to shading ring 3, insulator surface, insulator metal bulb 8 to ground 9, promptly through microampere meter directly with the insulator surface current shielding.
Can record the dc leakage-current that flows through insulator inside under the relevant voltage by microampere meter, judge then that than the gross leak current value there is interior insulation defect in insulator if occur.
The present invention produces dc high voltage through dc generator, and action of high voltage is tried to utilize shading ring with the direct short circuit of insulator surface leakage current simultaneously on the monolithic suspended insulator in quilt, makes it not flow through the microampere meter of connecting system.Thereby directly record insulator volumetric leak electric current, and judge insulating property in the insulator in view of the above from microampere meter.This method has realized the assessment to insulating property in the monolithic suspended insulator, and it is simple, highly sensitive that method has, and the advantage that measuring repeatability is good can be used as one of basic detection method of check suspended insulator insulating property.
Claims (1)
1. a method of testing insulating property in the dc leakage-current assessment monolithic suspended insulator is characterized in that, carries out according to the following steps:
(1) builds the dc leakage-current test macro: utilize dc generator as experiment power supply, utilize the connection lead that high direct voltage is added to the insulator two ends, seal in measuring microampere meter in the system;
(2) take shielding measure shielding insulation sub-surface leakage current: shading ring is placed by on the insulating material of examination insulator, any contact do not arranged with the metal bowl head of insulator; Equipotential shielding line is received on the shading ring; Pressurization back insulator surface leakage current does not flow through microampere meter through the shading ring short circuit;
(3) test of boosting: rising dc generator voltage, obtain insulator internal leakage size of current by the microampere meter reading of connecting system, when big leakage current occurring, judge insulator exist in insulation defect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100263652A CN102539979A (en) | 2012-02-07 | 2012-02-07 | Method for evaluating inner insulation performance of monolithic suspension insulator by testing direct-current leaked currents |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100263652A CN102539979A (en) | 2012-02-07 | 2012-02-07 | Method for evaluating inner insulation performance of monolithic suspension insulator by testing direct-current leaked currents |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102539979A true CN102539979A (en) | 2012-07-04 |
Family
ID=46347348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100263652A Pending CN102539979A (en) | 2012-02-07 | 2012-02-07 | Method for evaluating inner insulation performance of monolithic suspension insulator by testing direct-current leaked currents |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102539979A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105137267A (en) * | 2015-09-02 | 2015-12-09 | 国家电网公司 | Test device for directly measuring leakage current of test sample and wirelessly outputting data |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2445335Y (en) * | 2000-08-24 | 2001-08-29 | 张汉忠 | Portable pollution electric insulator current leakage detecting instrument |
| CN2574064Y (en) * | 2002-09-28 | 2003-09-17 | 西安三和新技术实业有限公司 | On-line dirt monitor for transformer substation |
| CN1558249A (en) * | 2004-01-20 | 2004-12-29 | 华北电力大学 | Charged detection method for insulator of high voltage direct current transmission line |
| CN2689413Y (en) * | 2004-01-30 | 2005-03-30 | 尹之仁 | Acquiring apparatus for surface current leakage of high-voltage transmitting line insulator |
| CN101650403A (en) * | 2009-09-15 | 2010-02-17 | 重庆大学 | Current sensor for polluted insulator leakage of AC high-voltage electric transmission line |
| CN102193040A (en) * | 2010-12-17 | 2011-09-21 | 青海电力科学试验研究院 | Method for performing insulation preventive test on zinc oxide lightning arrester without dismantling lead wire |
| CN102221641A (en) * | 2011-04-07 | 2011-10-19 | 北京交通大学 | On-line monitoring system for leakage current of high-voltage power transmission line insulator |
-
2012
- 2012-02-07 CN CN2012100263652A patent/CN102539979A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2445335Y (en) * | 2000-08-24 | 2001-08-29 | 张汉忠 | Portable pollution electric insulator current leakage detecting instrument |
| CN2574064Y (en) * | 2002-09-28 | 2003-09-17 | 西安三和新技术实业有限公司 | On-line dirt monitor for transformer substation |
| CN1558249A (en) * | 2004-01-20 | 2004-12-29 | 华北电力大学 | Charged detection method for insulator of high voltage direct current transmission line |
| CN2689413Y (en) * | 2004-01-30 | 2005-03-30 | 尹之仁 | Acquiring apparatus for surface current leakage of high-voltage transmitting line insulator |
| CN101650403A (en) * | 2009-09-15 | 2010-02-17 | 重庆大学 | Current sensor for polluted insulator leakage of AC high-voltage electric transmission line |
| CN102193040A (en) * | 2010-12-17 | 2011-09-21 | 青海电力科学试验研究院 | Method for performing insulation preventive test on zinc oxide lightning arrester without dismantling lead wire |
| CN102221641A (en) * | 2011-04-07 | 2011-10-19 | 北京交通大学 | On-line monitoring system for leakage current of high-voltage power transmission line insulator |
Non-Patent Citations (1)
| Title |
|---|
| 高振国: "绝缘电阻试验中屏蔽方法的研究", 《沈阳工程学院报（自然科学版）》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105137267A (en) * | 2015-09-02 | 2015-12-09 | 国家电网公司 | Test device for directly measuring leakage current of test sample and wirelessly outputting data |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103105568B (en) | Aging and the local discharge integrated experimental provision of transformer oil paper insulated electrothermic associating | |
| CN104062527B (en) | Evaluation method of aging degree of operational composite insulator | |
| US10439553B2 (en) | Method and system of fault detection and localization in DC-systems | |
| CN103558455B (en) | Arrester checks method | |
| CN106771924A (en) | A kind of utilization photoelectricity field sensor detects the detecting system and method for defects of insulator | |
| KR101290294B1 (en) | Partial discharge diagnostic system of power apparatus using contactless phase measurement sensor | |
| CN103123382A (en) | Photoelectric combined detection method aiming at mutual inductor of distribution network | |
| CN111458612A (en) | State monitoring and defect simulation system for electrical insulation performance of oil-immersed sleeve | |
| CN109799377A (en) | Electric railway step voltage and contact voltage test macro and its method | |
| CN109444781A (en) | A kind of GIS partial discharge superfrequency sensitivity check method based on signal propagation characteristics | |
| CN106249098A (en) | Testing device for current leakage and method of testing is saved on high-voltage arrester | |
| CN210119558U (en) | Program-controlled pulse current method partial discharge tester calibration system | |
| CN105467192A (en) | Method for measuring converter station potential rising on earth | |
| CN111289858A (en) | Method for judging partial discharge inside transformer | |
| CN107748295A (en) | A kind of device and method of GIS disc insulators dielectric loss test | |
| CN104360178A (en) | Method for measuring low-frequency noise of inverters and diagnosing faults thereof | |
| CN102539979A (en) | Method for evaluating inner insulation performance of monolithic suspension insulator by testing direct-current leaked currents | |
| CN206074164U (en) | Transformer high-voltage bushing end yi word pattern gold utensil three-dimensional pulling force sensor | |
| Meijer et al. | Sensitivity check for radio frequency partial discharge detection for power transformers | |
| CN212433359U (en) | Power transmission line grounding fault searching instrument | |
| CN206147012U (en) | Cable metallic shielding layer and conductor resistance compare test system | |
| CN109298368A (en) | A kind of partial-discharge ultrahigh-frequency sensor height equivlent compensation measuring system and method | |
| CN108896947A (en) | The field calibration method and transient voltage measurement method of converter station DC fields transient voltage non-contact measurement apparatus | |
| CN109270414A (en) | Day blind ultraviolet-cameras discharge examination sensitivity test method | |
| Werelius et al. | Measurement considerations using SFRA for condition assessment of Power Transformers |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120704 |