CN103048541A - Testing method for conductivity change in service process of grounding material - Google Patents
Testing method for conductivity change in service process of grounding material Download PDFInfo
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- CN103048541A CN103048541A CN2012105759334A CN201210575933A CN103048541A CN 103048541 A CN103048541 A CN 103048541A CN 2012105759334 A CN2012105759334 A CN 2012105759334A CN 201210575933 A CN201210575933 A CN 201210575933A CN 103048541 A CN103048541 A CN 103048541A
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Abstract
The invention relates to a testing method for conductivity change in a service process of a grounding material. According to the method, four tests, i.e., (1) a current temperature rise test, (2) a frosting-melting test, (3) a neutral salt mist corrosion test, and (4) a current shock test, are performed on the grounding material. According to the method provided by the invention, a service environment of the grounding material is simulated by the four processes, the advantages and the disadvantages of the grounding material are evaluated through resistance measurement and macrographic examination, and a feasible method is provided for inspection and detection of the grounding material of electric equipment.
Description
Technical field
The present invention relates to a kind of for to the electrical network earthing material test method that changes of the earthing material electric conductivity tested of the stability of the electric conductivity of process under arms.
Background technology
The Service Environment of electrical network earthing material is abominable, its main performance electric conductivity that affects that is subject to many factors changes in the process under arms, the large function of current when being struck by lightning, the burn into of environment are freezing etc., its electric conductivity can reduce under the effect of these factors, and then affect the earthing effect of equipment, therefore study the under arms situation of change of the electric conductivity in the process of earthing material, and to select better earthing material be very necessary.
Summary of the invention
Of the present invention
PurposeJust be to provide a kind of can to earthing material under arms in the process electric conductivity change the method for testing.
Of the present invention
Technical schemeFor: the test method that electric conductivity changes in a kind of earthing material military service process, its method is namely carried out following 4 tests to earthing material:
(1) current temperature rise test: be to the logical large electric current of earthing material, thermal effect by electric current allow the temperature of earthing material be increased to 350 degrees centigrade and kept temperature constant 1 hour and more than, then be cooled to room temperature, finish once circulation with this, at least finish after 25 circulations, measure the resistance of earthing material.
(2) freeze-thaw test: be that earthing material is placed in the water, the temperature of water is reduced to subzero below 10 degrees centigrade and keep then returning to room temperature more than 2 hours, finishes once circulation with this, through 10 times or with after the cocycle, measure the resistance of earthing material.
(3) neutral salt spray corrosion test: be that earthing material was placed on the neutral salt spray centre more than at least 500 hours, the outward appearance of measuring afterwards the resistance of earthing material and observing earthing material, described neutral salt spray adopts 4%-8% NaCl distilled water solution.
(4) rush of current test: be that the size of dash current is 90% of its fusion current, the outward appearance of measuring afterwards the resistance of earthing material and observing earthing material to the logical dash current of earthing material.
Of the present invention
Beneficial effectFor: along with electrical network towards intensive, normalized development, it is particularly important that the reliable ground of electrical equipment grounding material seems.The ground connection of electrical equipment was adopted the mode of empirical data and random ground connection in the past.For example on material selection, according to issuable harm, select psychological acceptable material, and adopt easily a kind of connected mode, do not consider issuable consequence under dangerous situation.There are not the calculating of science and the tolerance check of earthing device.Some institutes of scientific research institute begin to recognize the necessity of check, and standard is progressively formulated some relevant criterion.
The inventive method has proposed the Service Environment that Four processes comes the analogue ground material, evaluates the quality of earthing material by resistance measurement and macroscopic examination, feasible method is provided for the inspection of electrical equipment grounding material.
Description of drawings
Fig. 1 is the formation schematic block diagram of the full-automatic test unit that adopts in the test method that electric conductivity changes in a kind of earthing material military service of embodiment of the invention process;
Fig. 2 be adopt in the test method that electric conductivity changes in a kind of earthing material military service of embodiment of the invention process the structural representation of full-automatic test unit;
Fig. 3 is the structural representation of sample clamping mechanism in the full-automatic test unit that adopts in the test method that electric conductivity changes in a kind of earthing material military service of embodiment of the invention process.
Embodiment
The test method that electric conductivity changes in a kind of earthing material military service of embodiment of the invention process, its method is namely carried out following 4 tests to earthing material:
(1) current temperature rise test: be to the logical large electric current of earthing material, thermal effect by electric current allow the temperature of earthing material be increased to 350 degrees centigrade and kept temperature constant 1 hour and more than, then be cooled to room temperature, finish once circulation with this, at least finish after 25 circulations, measure the resistance of earthing material.
(2) freeze-thaw test: be that earthing material is placed in the water, the temperature of water is reduced to subzero below 10 degrees centigrade and keep then returning to room temperature more than 2 hours, finishes once circulation with this, through 10 times or with after the cocycle, measure the resistance of earthing material.
(3) neutral salt spray corrosion test: be that earthing material was placed on the neutral salt spray centre more than at least 500 hours, the outward appearance of measuring afterwards the resistance of earthing material and observing earthing material, described neutral salt spray adopts 4%-8% NaCl distilled water solution.
(4) rush of current test: be that the size of dash current is 90% of its fusion current, the outward appearance of measuring afterwards the resistance of earthing material and observing earthing material to the logical dash current of earthing material.
The present invention can develop a kind of full-automatic test unit that changes test for the earthing material electric conductivity shown in accompanying drawing 1,2,3 when implementing, it comprises integrated four experimental provisions and control system and evaluation system as shown in Figure 1, and integrated four experimental provisions comprise respectively electric current-temperature-rise test device, electric current-temperature-rise test device, fault current impact test apparatus; Control system comprises collecting mechanism and topworks, and evaluation system comprises the collection assessing mechanism of resistance measurement mechanism and earthing material outward appearance; The resistance measurement mechanism of the collecting mechanism of control system and evaluation system is connected, and the topworks of control system connects and control the collection assessing mechanism of the earthing material outward appearance of integrated four experimental provisions and evaluation system.
As shown in Figure 2,
Strong current generator is connected with anchor clamps 5 with microhmmeter, the test before with the electrical equipment grounding paper material clamping on the anchor clamps 5 on sample clamping mechanism both sides, set the test parameters of strong current generator, the test parameters of freezing fusing, then the parameter of salt spray corrosion test starts initial resistance and the image data that microhmmeter is measured earthing material by control system
Then signal to strong current generator by control system, begin to carry out the current temperature rise test, signal to control system after the off-test, control system starts the resistance that microhmmeter is measured earthing material.
Control system moves to the breach center that freezing fusion test casing 3 is opened by sample clamping mechanism with earthing material after the resistance measurement, by casing lifting gear 1 freezing fusion test upper box is descended, and seals, and then begins to carry out freezing fusion test.After freezing fusion test finishes, control system promotes upper box by lifting gear 1, anchor clamps 5 drive earthing material and rise under the effect of spring 7, start simultaneously microhmmeter and measure the resistance of earthing material, and by the acquisition system image data, then start and on guide rail 11, to carry out automatic camera by movable digit microscope, be subjected to visual examination with this.
Then the breach 9 that earthing material moves on the salt-mist corrosion tester body 2 is hit exactly by sample clamping mechanism by control system, by casing lifting gear 1 the salt spray corrosion test upper box is descended, seal, then begin to carry out salt spray corrosion test.After salt spray corrosion test finishes, control system promotes upper box by lifting gear 1, anchor clamps 5 drive earthing material and rise under the effect of spring 7, start simultaneously microhmmeter and measure the resistance of earthing material, and by the acquisition system image data, then start and on guide rail 11, to carry out automatic camera by movable digit microscope, be subjected to visual examination with this.
Then control system signals to strong current generator and carries out the fault current impulse test, strong current generator signaled to control system after the fault current impulse test finished, start simultaneously microhmmeter and measure the resistance of earthing material, and by the acquisition system image data, then start and on guide rail 11, to carry out automatic camera by movable digit microscope, be subjected to visual examination with this.
Electrical equipment grounding material clamping is on chuck, and chuck can be mobile under the both sides travel mechanism drives, strong current generator and microhmmeter.
Be not provided with a vertical promotion mechanism (1) upper left the parting on the right side of the crossbeam of support (11);
Described salt-fog test casing (2) and freezing fusion test casing (3) all are made as upper and lower two parts, be provided with corresponding groove (9) in the top and the bottom of salt-fog test casing (2) and freezing fusion test casing (3), the latter half of salt-fog test casing (2) and freezing fusion test casing (3) is arranged on the base plate of support (11), and the first half of salt-fog test casing (2) and freezing fusion test casing (3) is connected in vertical promotion mechanism (1) corresponding to position;
Be provided with the horizontal travel mechanism (4) of supporting salt-fog test casing (2) and freezing fusion test casing (3) at the base plate of support (11), described horizontal travel mechanism (4) is by anchor clamps (5), spring (7), column (8), base (10) forms, base (10) is set to symmetrical two both sides that are positioned at respectively the chamber body on the mobile base plate that is installed in support (11), at each base (10) column (8) is installed, be arranged with spring (7) at each column (8), be equipped with the anchor clamps (5) that can move up and down in the upper end of two columns (7), spring (7) withstands on anchor clamps (5) bottom.
Spring (7) is used for guaranteeing that anchor clamps (5) are in the extreme higher position of column (8) all the time, and laterally travel mechanism (4) can be laterally mobile under the drive of base (10).
The current temperature rise test is the stability of test earthing material under large electric current continuous action; freezing fusion test and salt spray corrosion test are the stabilities under the simulating natural condition; the fault current impulse test is the protective effect of test earthing material when equipment failure; by these four tests; the various conditions in the electrical equipment grounding material military service process have been simulated, the usability of having tested preferably the electrical equipment grounding material.
Claims (1)
1. the test method that electric conductivity changes in the earthing material military service process, it is characterized in that: the method is that earthing material is carried out following 4 tests:
(1) current temperature rise test: be to the logical large electric current of earthing material, thermal effect by electric current allow the temperature of earthing material be increased to 350 degrees centigrade and kept temperature constant 1 hour and more than, then be cooled to room temperature, finish once circulation with this, at least finish after 25 circulations, measure the resistance of earthing material;
(2) freeze-thaw test: be that earthing material is placed in the water, the temperature of water is reduced to subzero below 10 degrees centigrade and keep then returning to room temperature more than 2 hours, finishes once circulation with this, through 10 times or with after the cocycle, measure the resistance of earthing material;
(3) neutral salt spray corrosion test: be that earthing material was placed on the neutral salt spray centre more than at least 500 hours, the outward appearance of measuring afterwards the resistance of earthing material and observing earthing material, described neutral salt spray adopts 4%-8% NaCl distilled water solution;
(4) rush of current test: be that the size of dash current is 90% of its fusion current, the outward appearance of measuring afterwards the resistance of earthing material and observing earthing material to the logical dash current of earthing material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105759334A CN103048541A (en) | 2012-12-27 | 2012-12-27 | Testing method for conductivity change in service process of grounding material |
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|---|---|---|---|
| CN2012105759334A CN103048541A (en) | 2012-12-27 | 2012-12-27 | Testing method for conductivity change in service process of grounding material |
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| CN103048541A true CN103048541A (en) | 2013-04-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149473A (en) * | 2013-01-29 | 2013-06-12 | 河北省电力公司电力科学研究院 | Full-automatic test device used for grounding material conductivity change |
| CN103472352A (en) * | 2013-09-16 | 2013-12-25 | 国网河南省电力公司焦作供电公司 | Ground lead detection method |
| CN105445578A (en) * | 2015-11-13 | 2016-03-30 | 北京国电富通科技发展有限责任公司 | Assessment method for testing influence of electrical joint compound on reliability of electrical connection |
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| CN101413972A (en) * | 2008-11-27 | 2009-04-22 | 天津大学 | System and method for testing electric resistivity of thin film thermoelectricity material |
| CN201666431U (en) * | 2010-03-11 | 2010-12-08 | 上海交运汽车精密冲压件有限公司 | Dissimilar metal corrosion prevention component |
| CN102041506A (en) * | 2009-10-13 | 2011-05-04 | 北京中科三环高技术股份有限公司 | Surface treatment method of permanent magnet material |
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| JPH034179A (en) * | 1989-06-01 | 1991-01-10 | Fujitsu Ltd | Electric testing method by contact probe |
| CN1228534A (en) * | 1998-12-25 | 1999-09-15 | 北京航空材料研究院 | Electrical measurement method for measuring conducting material structure |
| CN101413972A (en) * | 2008-11-27 | 2009-04-22 | 天津大学 | System and method for testing electric resistivity of thin film thermoelectricity material |
| CN102041506A (en) * | 2009-10-13 | 2011-05-04 | 北京中科三环高技术股份有限公司 | Surface treatment method of permanent magnet material |
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| SASHI G. PATEL等: "IEEE Standard for Qualifying Permanent Connections Used in Substation Grounding", 《IEEE POWER ENGINEERING SOCIETY》 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149473A (en) * | 2013-01-29 | 2013-06-12 | 河北省电力公司电力科学研究院 | Full-automatic test device used for grounding material conductivity change |
| CN103472352A (en) * | 2013-09-16 | 2013-12-25 | 国网河南省电力公司焦作供电公司 | Ground lead detection method |
| CN103472352B (en) * | 2013-09-16 | 2016-11-23 | 国家电网公司 | A kind of ground wire testing method |
| CN105445578A (en) * | 2015-11-13 | 2016-03-30 | 北京国电富通科技发展有限责任公司 | Assessment method for testing influence of electrical joint compound on reliability of electrical connection |
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Application publication date: 20130417 |