CN105911398A - Method for detecting composite insulator interface - Google Patents
Method for detecting composite insulator interface Download PDFInfo
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- CN105911398A CN105911398A CN201610406920.2A CN201610406920A CN105911398A CN 105911398 A CN105911398 A CN 105911398A CN 201610406920 A CN201610406920 A CN 201610406920A CN 105911398 A CN105911398 A CN 105911398A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention discloses a method for detecting a composite insulator interface, which comprises the following steps: sampling from a composite insulator to be detected to obtain an experimental group insulator and a reference group insulator, and then carrying out a poaching experiment on the experimental group insulator, wherein the poaching time is 300 h; installing reference group insulators and experimental group insulators in electrode structures of respective high-voltage circuits, and applying voltage to the electrode structures; detecting leakage currents of an experimental group insulator and a reference group insulator through a leakage current detection device in a high-voltage circuit, and testing the surface temperatures of the experimental group insulator and the reference group insulator through a surface temperature tester; and judging whether the interface of the sheath of the composite insulator to be detected and the core rod has debonding defects or not according to the leakage current and the surface temperature of the experimental group insulator and the reference group insulator. The invention can more effectively judge the insulator with defects on the interface or poor hydrolysis resistance.
Description
Technical field
The present invention relates to the detection field of insulator interface, particularly relate to a kind of composite insulator interface
Detection method.
Background technology
Composite insulator interface quality is closely related with overall operation performance, and in recent years, China is existing branched
Insulator ruptures because of interface defect, causes huge economic loss to electrical network, has had a strong impact on its people
Expanding economy.
Water-diffusion test method is the most effective, in order to detect composite insulator interface cementability
The detection method of energy.In the world, at IEC61109-1992 earlier and newer IEC62217-2012
In, it is recommended to use decocting in water 100h, it is detected by the leakage current method less than 1000 μ A, and
Domestic, owing to interface defect causes the attention of people day by day, by 100h in up-to-date GB/T19519-2014
Water-diffusion test standard is down to 100 μ A by 1000 μ A.Patent No. 201210110874.3, patent name
Propose one for the patent of " detection method of a kind of composite insulator interface and system " can effectively reflect
The solution of the unsticking defect of other sheath and plug interface, the program i.e. uses 100h water-diffusion test
Standard 100 μ A；But can be obtained by test, even if portioned product has lost cementability when for decocting in water,
But its 100h water diffusion result still close to or less than standard value, thus 100h water-diffusion test standard 100 μ A
Also adjustment is needed badly, to improve the accuracy of testing result.
Summary of the invention
For above-mentioned technical problem, it is an object of the invention to provide the detection of a kind of composite insulator interface
Method, it can more efficient discriminating sheath and the unsticking class defect of plug interface.
For reaching above-mentioned purpose, the present invention is achieved through the following technical solutions:
The detection method of a kind of composite insulator interface, comprises the steps:
A, sampling from composite insulator to be detected, it is thus achieved that experimental group insulator and reference group insulator, so
Afterwards described experimental group insulator being carried out decocting in water experiment, the decocting in water time is 300h；
B, by described reference group insulator and through decocting in water experiment process experimental group insulator be arranged on respective high pressure
In the electrode structure of circuit, and described electrode structure is applied voltage；
C, detect device test experience group insulator by Leakage Current in described high-tension circuit and reference group is exhausted
The leakage current of edge, meanwhile, tests described experimental group insulator and reference group by surface temperature tester
The surface temperature of insulator；
D, according to experimental group insulator described in step C and the leakage current of reference group insulator and surface temperature
Degree, it is judged that whether the sheath of described composite insulator to be detected and the interface of plug exist unsticking class defect.
Wherein, described step B specifically includes:
B1, at experimental group insulator and the top of reference group insulator and bottom, one sheet metal is respectively set, then
Respective electrode structure two plate electrode is inserted at described experimental group insulator and the top of reference group insulator and bottom
Groove in；
B2, conveying voltage give described high-tension circuit, start described experimental group insulator and reference group insulator
Apply voltage.
Wherein, described step C specifically includes:
C1, detect device test experience group insulator and reference group by Leakage Current in described high-tension circuit
The leakage current of insulator, meanwhile, tests described experimental group insulator and reference by surface temperature tester
The surface temperature of group insulator；
C2, adjustment are applied to described experimental group insulator and the voltage at reference group insulator two ends, repeat step
The operation of C1.
Wherein, described step D specifically includes:
The change of the voltage at judgment experiment group insulator two ends and the change of corresponding leakage current whether in
Linear change, and the amplitude of the leakage current of experimental group insulator the most not higher than 200 microamperes, if with
Time meet, then the surface temperature of judgment experiment group insulator whether not higher than 50 degrees Celsius, and to experiment
When group insulator applies identical voltage with reference group insulator, whether the surface temperature of experimental group insulator is than ginseng
When exceeding value less than 10 degrees Celsius according to the surface temperature organizing insulator, if met the most simultaneously, then judge to be checked
There is not unsticking class defect in the sheath of composite insulator surveyed and the interface of plug.
Wherein, described step D also includes:
The leakage corresponding to leakage current according to experimental group insulator described in step C and reference group insulator
The waveform of electric current, it is judged that whether experimental group insulator and reference group insulator deposit shelf depreciation.
Wherein, infrared camera selected by described surface temperature tester, obtains from the picture of infrared camera shooting
Experimental group insulator and the surface temperature of reference group insulator and described experimental group insulator sheath and plug
There is position and the shape size of unsticking class defect in interface.
The present invention extends the decocting in water time, can significantly more efficient judgement interface existing defects or anti-hydrolytic performance
The best insulator, and propose the new by standard of leakage current according to anatomical results, will water diffusion
Test period is extended to 300h by 100h, leakage current is changed into 200 μ A by standard by 100 μ A, significantly
Improve the accuracy of result of the test.
Accompanying drawing explanation
The detection method flow chart of the composite insulator interface that Fig. 1 provides for the embodiment of the present invention；
The actual application schematic diagram of the decocting in water container that Fig. 2 provides for the embodiment of the present invention；
The electrical block diagram of the high-tension circuit that Fig. 3 provides for the embodiment of the present invention；
The leakage current that Fig. 4 provides for the embodiment of the present invention and the graph of a relation of test voltage；
Different manufacturers band sheath short sample 100h, 200h, 300h decocting in water examination that Fig. 5 provides for the embodiment of the present invention
Test result；
The 100h water-diffusion test result of the aged samples that Fig. 6 provides for the embodiment of the present invention；
The 200h water-diffusion test result of the aged samples that Fig. 7 provides for the embodiment of the present invention；
The 300h water-diffusion test result of the aged samples that Fig. 8 provides for the embodiment of the present invention；
The interface cementability grade explanatory diagram that Fig. 9 provides for the embodiment of the present invention；
The leakage current that Figure 10 provides for the embodiment of the present invention and the graph of a relation of caking ability K.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with the accompanying drawings with embodiment pair
The present invention is described further.
During the defect of composite insulator interface has a lot, but for the unsticking class of sheath Yu plug interface
Defect namely sheath and the in-problem defect of bond quality of plug interface, there is presently no concrete inspection
Survey method.The invention provides a kind of unsticking class defect detecting composite insulator sheath and plug interface
Method, its principle is: if the interface of the sheath of composite insulator and plug exists unsticking class defect, that
When decocting in water is tested, unsticking class defect will be apparent from, and moisture will be had to invade at fault location, its material
The electrical conductivity of material will raise, and composite insulator now applies the voltage gradually risen, and the electric current of fault location is close
Degree will increase, and leakage current will raise therewith, occurs local pyrexia accordingly, and surface temperature also can rise,
Relatively the composite insulator after decocting in water experiment with without the Leakage Current with reference to insulator of decocting in water and surface temperature
Degree, referring next to the bond quality of standard of perfection evaluating combined insulator sheath Yu plug interface.
Refer to shown in Fig. 1, the detection side of the composite insulator interface that Fig. 1 provides for the embodiment of the present invention
Method flow chart.
In the present embodiment, the detection method of composite insulator interface comprises the steps:
Step 101, sampling from composite insulator to be detected, it is thus achieved that experimental group insulator and reference group insulation
Son.
Diamond saw is used to cut down 5 parts of experimental group insulators and 1 under cold water from composite insulator to be detected
Part reference group insulator, it is desirable to: cross section level of approximation, 90 degree of angles are become with axis, length is at 70 millis
Rice, in the range of 80 millimeters, uses sand paper pair cross-section to carry out polishing and makes it the most smooth, and makes section edges do
Only, impulse-free robustness.If variant with said process in sampling process, need to record in laboratory report.
Step 102, experimental group insulator is carried out decocting in water experiment.
Before decocting in water is tested, use isopropanol and filter paper cleaning experiment group insulator and the table of reference group insulator
Face.5 parts of experimental group insulators are put into (glass or stainless steel material) in decocting in water container, uses deionization
Water carries out the decocting in water experiment in the range of 23.5 hours to 24.5 hours, wherein, needs in deionized water to add
The sodium chloride of 0.1% mass.Thickness according to experimental group insulator sheath is different, and the time of decocting in water experiment is corresponding
Can change, if the thickness of sheath is more than 5 millimeters, it is recommended that the decocting in water time was at about 300 hours.If
Need to contrast the bond quality of sheath and plug interface between different types of composite insulator, carrying out
During decocting in water experiment, it is placed in same decocting in water container by the experimental group insulator intercepted from same composite insulator
Row decocting in water is tested.
After decocting in water has been tested, experimental group insulator is taken out, put in another container (glass or stainless
Steel material), the tap water being subsequently adding room temperature soaks at least 15 minutes.It should be noted that, need little at three
Time within, experimental group insulator is applied voltage, namely starts pressurization experiment, not so by the effect of impact experiment.
As in figure 2 it is shown, the actual application schematic diagram of decocting in water container that Fig. 2 provides for the embodiment of the present invention, figure
In 201 be condensing zone, 202 is condensing tube, and 203 is experimental group insulator, and 204 is adjustable heating plate, 205
For decocting in water container, wherein, a length of 400mm (millimeter) of condensing zone 201, condensing tube 202 a length of
700mm。
Step 103, by reference group insulator and through decocting in water experiment process experimental group insulator be arranged on respective height
In the electrode structure of volt circuit, and described electrode structure is applied voltage.
Identical with the high-tension circuit that experimental group insulator applying voltage is used to reference group insulator, Fig. 3 is
The electrical block diagram of the high-tension circuit that the embodiment of the present invention provides, this high-tension circuit includes: potentiometer T1,
High-tension transformer T2, high-pressure measurement mechanism V, Leakage Current detection device i.e. milliammeter mA, milliammeter protection
Circuit Pr and electrode structure S, wherein, one end of described potentiometer T1 connects high voltage power supply, and the other end is even
Connect high-tension transformer T2, one end of described high-pressure measurement mechanism V and one end of electrode structure S and high pressure transformation
One end of device T2 connects, the other end and the other end of high-tension transformer, one end of milliammeter mA and milliampere
One end of table protection circuit Pr connects, and the other end of described milliammeter protection circuit Pr is another with milliammeter mA's
The other end of one end and electrode structure S connects.
Before carrying out pressurization experiment, need to use filter paper to wipe dry by experimental group insulator surface, sop up surface water
Point.For the ease of experimental group insulator and reference group insulator being fixed in electrode structure, improve electric conductivity,
The present embodiment offers on two plate electrodes of electrode structure and described experimental group insulator and reference group insulator
The top groove corresponding with bottom, and in experimental group insulator and the top of reference group insulator and bottom
Respectively padding equipped with a tinsel, experimental group insulator and the top of reference group insulator and bottom are stuck in the most at last
In the groove of two plate electrodes.Then, conveying voltage gives described high-tension circuit, starts to insulate described experimental group
Son and reference group insulator apply voltage.
Step 104, detect device test experience group insulator and ginseng by Leakage Current in described high-tension circuit
According to group insulator leakage current, meanwhile, by surface temperature tester test described experimental group insulator and
The surface temperature of reference group insulator.
In the present embodiment, Leakage Current detection device is the milliammeter mA in described high-tension circuit, and surface temperature is surveyed
Infrared camera selected by examination instrument.The initial boost speed of high-tension circuit is 1 kilovolt (kv) per second, continues 3 seconds,
When test voltage arrives 3 kilovolts, maintain this voltage constant, use infrared camera to measure after the 2 minutes real
Test group insulator and the surface temperature of reference group insulator.When using infrared camera shooting, need to shoot compound exhausted
The temperature conditions on the full surface of edge, it is proposed that shoot 4 photos from circumferentially-spaced 90 degree.Without infrared phase
Machine, it would however also be possible to employ the instrument of other single-point thermometric, at experimental group insulator and the table of reference group insulator
6 sampled points are uniformly chosen in face, the surface temperature situation in the range of the temperature representative of each sampled point 60 degree.
After in first time, temperature survey completes, boost 2 kilovolts, after voltage stabilization two minutes, again according to first
Secondary thermometric method measures surface temperature, completes follow-up high 2 kilovoltages of continuing rising of temperature survey.Above-mentioned
Process repeats until test voltage reaches 29 kilovolts.(now try after temperature survey completes the last time
Electrical verification pressure is 29 kilovolts), test voltage is depressurized to zero.What deserves to be explained is, measure at each electrical voltage point
While experimental group insulator and reference group insulator surface temperature, in addition it is also necessary to record experimental group insulator and ginseng
According to the size of group insulator Leakage Current, and make leakage current and test voltage with corresponding test voltage
Graph of a relation.Owing to humidity can affect air conductivity, temperature can affect the surface temperature of insulator in boost process
Degree, in order to seek unity of standard, needs to record temperature and the humidity of external environment when testing.
Step 105, according to the experimental group insulator that detects and the leakage current of reference group insulator and surface
Temperature, it is judged that whether the sheath of composite insulator to be detected and the interface of plug exist unsticking class defect.
According to the experimental group insulator detected and the leakage current of reference group insulator and surface temperature, so
Rear comparison standard of perfection judges whether the sheath of composite insulator to be detected exists with the interface of plug
Unsticking class defect.And according to corresponding to the leakage current of described experimental group insulator and reference group insulator
The waveform of leakage current, it can be determined that whether experimental group insulator and reference group insulator deposit shelf depreciation, when
When the waveform of stable leakage current occurs, illustrate that experimental group insulator and reference group insulator exist local and put
Electrical phenomena, then be accomplished by taking steps to suppress shelf depreciation.
Wherein, described standard of perfection has three: Article 1, under any experimental voltage, experimental group insulator
The change of the voltage at two ends and the change of corresponding leakage current linearly change.Article 2, any
Under experimental voltage, the amplitude of the leakage current of experimental group insulator is not higher than 200 microamperes.Article 3, in office
Under what experimental voltage, the surface temperature of experimental group insulator is not higher than 50 degrees Celsius, and exhausted to experimental group
When edge applies identical voltage with reference group insulator, the surface temperature of experimental group insulator is more exhausted than reference group
The surface temperature of edge exceeds value less than 10 degrees Celsius.Meet the first to the 3rd of standard of perfection the most at the same time
During bar, just can determine that the sheath of composite insulator to be detected and the interface of plug do not exist unsticking class defect.
As shown in Figure 4, the leakage current that Fig. 4 provides for the embodiment of the present invention and the graph of a relation of test voltage, scheme
In 401 be the experimental group curve that in 5 parts of experimental group insulators, a copy of it is corresponding, 402 is reference group insulator
Corresponding reference group curve, experimental group curve 401 reflects the voltage at experimental group insulator two ends in the figure
Change and the change of corresponding leakage current the most linearly change, therefore can be determined that to be detected multiple
There is unsticking class defect in the interface of the sheath and plug that close insulator.It should be noted that at the present embodiment
5 parts of experimental group insulators in, if be detected that have the sheath of a experimental group insulator and the boundary of plug
There is unsticking class defect in face, then indicates that the viscous of the sheath of composite insulator to be detected and the interface of plug
Knot quality existing problems, it is impossible to by detection.
It addition, the picture shot by infrared camera is insulated except obtaining experimental group insulator and reference group
Outside the surface temperature of son, it is also possible to observe the interface of described experimental group insulator sheath and plug intuitively
There is position and the shape size of unsticking class defect.
To sum up, the composite insulator interface detection method that the present embodiment proposes is in patent
The improvement carried out on the basis of 201210110874.3, main improvement part is:
1) the water-diffusion test time is extended to 300h by 100h.
2) leakage current is changed into 200 μ A by standard by 100 μ A.
The support test of the method mainly has:
1, the decocting in water result of brand-new composite insulator
Brand-new insulator is carried out water diffusion experiment, comprises T, K2 producer, the sample of two batches of a, b
Product.
Decocting in water result such as Fig. 5 shows, sample is after 300h decocting in water, and its leakage current values is generally higher than 100
μ A decocting in water result, but is below 200 μ A.Illustrating up-to-standard, the product of process can meet 300h,
The requirement of 200 μ A.
2, the decocting in water result of aging insulator
The insulator running certain time limit is carried out the water-diffusion test of different duration.Wherein, the water of 100h expands
Eliminating stagnation fruit as shown in Figure 6, runs the boiling test result of insulator not only far below being advised in prior standards
1000 fixed μ A, also close to 100 μ A in newest standards.
After decocting in water after a longer time, leakage current values occurs in that significantly rising, 200h as shown in Figure 7
Water diffusion result and Fig. 8 shown in 300h water diffusion result.
Sample is carried out Dissection test, according to the silicone rubber amount of interface residual, interface cementability is divided into 5
Level, as shown in Figure 9.
Bonding grade CC0 during the non-decocting in water of sample, bonding grade CC1 after 100h decocting in water, 200h decocting in water is bonding
Grade CC2, bonding grade CC3 of 300h decocting in water.Bonding situation is as shown in the table:
Bonding situation
Even if it is found that portioned product has lost cementability when non-decocting in water, but its 100h water spreads
Result still close to or less than standard value, 100h water diffusion result fails well to detect cementability defect.
Taking bond degree K is CC0, the meansigma methods of CC1, CC2, CC3.K hands over during having reacted whole decocting in water
The situation of change of bonding interface.
Result of the test shows, 300h water diffusion result has good corresponding relation, such as Figure 10 institute with bond degree K
Show.The on-the-spot insulator interface that runs is under the common effect of high temperature moisture, and cementability may be lost, therefore
Needing interface to have certain anti-hydrolytic performance, as required insulator after 300h decocting in water, cementability does not goes out
The most significantly decline, then K should be greater than 4, and corresponding leakage current values is about 200 μ A.
Above are only presently preferred embodiments of the present invention and institute's application technology principle, any be familiar with the art
Technical staff in the technical scope that the invention discloses, the change that can readily occur in or replacement, all should contain
In protection scope of the present invention.
Claims (6)
1. the detection method of a composite insulator interface, it is characterised in that comprise the steps:
A, sampling from composite insulator to be detected, it is thus achieved that experimental group insulator and reference group insulator, so
Afterwards described experimental group insulator being carried out decocting in water experiment, the decocting in water time is 300h；
B, by described reference group insulator and through decocting in water experiment process experimental group insulator be arranged on respective high pressure
In the electrode structure of circuit, and described electrode structure is applied voltage；
C, detect device test experience group insulator by Leakage Current in described high-tension circuit and reference group is exhausted
The leakage current of edge, meanwhile, tests described experimental group insulator and reference group by surface temperature tester
The surface temperature of insulator；
D, according to experimental group insulator described in step C and the leakage current of reference group insulator and surface temperature
Degree, it is judged that whether the sheath of described composite insulator to be detected and the interface of plug exist unsticking class defect.
The detection method of composite insulator interface the most according to claim 1, it is characterised in that institute
State step B to specifically include:
B1, at experimental group insulator and the top of reference group insulator and bottom, one sheet metal is respectively set, then
Respective electrode structure two plate electrode is inserted at described experimental group insulator and the top of reference group insulator and bottom
Groove in；
B2, conveying voltage give described high-tension circuit, start described experimental group insulator and reference group insulator
Apply voltage.
The detection method of composite insulator interface the most according to claim 1 and 2, it is characterised in that
Described step C specifically includes:
C1, detect device test experience group insulator and reference group by Leakage Current in described high-tension circuit
The leakage current of insulator, meanwhile, tests described experimental group insulator and reference by surface temperature tester
The surface temperature of group insulator；
C2, adjustment are applied to described experimental group insulator and the voltage at reference group insulator two ends, repeat step
The operation of C1.
The detection method of composite insulator interface the most according to claim 1, it is characterised in that institute
State step D to specifically include:
The change of the voltage at judgment experiment group insulator two ends and the change of corresponding leakage current whether in
Linear change, and the amplitude of the leakage current of experimental group insulator the most not higher than 200 microamperes, if with
Time meet, then the surface temperature of judgment experiment group insulator whether not higher than 50 degrees Celsius, and to experiment
When group insulator applies identical voltage with reference group insulator, whether the surface temperature of experimental group insulator is than ginseng
When exceeding value less than 10 degrees Celsius according to the surface temperature organizing insulator, if met the most simultaneously, then judge to be checked
There is not unsticking class defect in the sheath of composite insulator surveyed and the interface of plug.
The detection method of composite insulator interface the most according to claim 4, it is characterised in that institute
State step D also to include:
The leakage corresponding to leakage current according to experimental group insulator described in step C and reference group insulator
The waveform of electric current, it is judged that whether experimental group insulator and reference group insulator deposit shelf depreciation.
6. according to the detection method of the composite insulator interface one of claim 3 to 5 Suo Shu, its feature
Being, infrared camera selected by described surface temperature tester, obtains experiment from the picture of infrared camera shooting
Organize the boundary of insulator and the surface temperature of reference group insulator and described experimental group insulator sheath and plug
There is position and the shape size of unsticking class defect in face.
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| CN107688141A (en) * | 2017-10-20 | 2018-02-13 | 广东电网有限责任公司电力科学研究院 | The interface performance test system and method for a kind of composite insulator |
| CN107797036A (en) * | 2017-10-19 | 2018-03-13 | 广东电网有限责任公司电力科学研究院 | A kind of method based on high voltage and the evaluating combined insulator interface performance of salting liquid |
| CN109581105A (en) * | 2018-11-28 | 2019-04-05 | 武汉大学 | Composite insulator interface performance appraisal procedure based on leakage current change rate |
| CN110146444A (en) * | 2019-06-11 | 2019-08-20 | 重庆大学 | A method for testing the bonding strength of composite insulators |
| CN110806409A (en) * | 2019-11-27 | 2020-02-18 | 云南电网有限责任公司电力科学研究院 | Method for detecting bonding strength of composite insulator |
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| CN112098601A (en) * | 2020-09-15 | 2020-12-18 | 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 | Composite insulator takes sheath plug water diffusion test boiling device |
| CN112595993A (en) * | 2020-12-29 | 2021-04-02 | 江苏神马电力股份有限公司 | Insulating medium interface leakage current measuring system and method |
| CN112986757A (en) * | 2021-02-03 | 2021-06-18 | 浙江紫电新材料有限公司 | Alicyclic epoxy resin insulator core rod-sheath interface performance detection method based on defect extension rate |
| CN113686748A (en) * | 2021-07-27 | 2021-11-23 | 南方电网科学研究院有限责任公司 | Method for classifying pore structures of composite insulator core rods |
| CN115144790A (en) * | 2022-09-02 | 2022-10-04 | 山东理工大学 | A system and method for on-line monitoring of leakage current of high-voltage insulators |
| CN115144790B (en) * | 2022-09-02 | 2022-11-18 | 山东理工大学 | High-voltage insulator leakage current online monitoring system and method |
| CN117347912A (en) * | 2023-12-06 | 2024-01-05 | 清华大学深圳国际研究生院 | Optical fiber insulator interface performance testing device and interface performance evaluation method |
| CN117347912B (en) * | 2023-12-06 | 2024-03-22 | 清华大学深圳国际研究生院 | Optical fiber insulator interface performance testing device and interface performance evaluation method |
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