CN112698102A - Method and device for testing interfacial resistivity of composite insulator sheath and core rod - Google Patents
Method and device for testing interfacial resistivity of composite insulator sheath and core rod Download PDFInfo
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- CN112698102A CN112698102A CN202110122114.3A CN202110122114A CN112698102A CN 112698102 A CN112698102 A CN 112698102A CN 202110122114 A CN202110122114 A CN 202110122114A CN 112698102 A CN112698102 A CN 112698102A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1245—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
Abstract
The invention discloses a method and a device for testing the interfacial resistivity of a composite insulator sheath and a core rod, wherein the method comprises the following steps: obtaining leakage current I of the sheath and core rod interface when the composite insulator to be tested is loaded with test voltage2(ii) a According to the height d of the composite insulator to be tested, the section perimeter c and the leakage current I of the sheath and core rod interface2And obtaining the interfacial resistivity of the sheath and the core rod of the composite insulator to be tested by using an interfacial resistivity calculation formula. According to the invention, the calculation of the interface resistivity is realized by testing the leakage current of the sheath and the core rod interface, and then the interface resistivity is calculated by adding the interface current for size correction, so that the method can be used for evaluating the interface states of the sheath and the core rod of the core rod composite insulator with different diameters, and has the advantages of more accurate detection, simple test method and easy popularization.
Description
Technical Field
The invention relates to the technical field of composite insulator performance testing, in particular to a method and a device for testing the interfacial resistivity of a composite insulator sheath and a core rod.
Background
The composite insulator is a third-generation insulator following a porcelain insulator and a glass insulator, has excellent anti-pollution flashover performance, and is widely applied to a power grid at present. The composite insulator mainly comprises three parts: epoxy glass fiber core rod, silicon rubber sheath, umbrella skirt and end connecting hardware fitting. The connection between the parts forms the interface of the composite insulator. The interface between the silicone rubber sheath and the epoxy glass fiber core rod has the greatest influence on the performance of the composite insulator. In the actual operation and use process, the problems of abnormal temperature rise, internal insulation breakdown, breakage and the like of the composite insulator are related to the state of the composite insulator sheath and the core rod interface.
In order to evaluate the jacket-to-mandrel interfacial properties of composite insulators, the "water diffusion test" in GB/T19519-2014 definition of suspended and strained composite insulators for ac systems with nominal voltages higher than 1000V, test methods and acceptance criteria is currently used. The test flow is as follows: cutting a core rod (with a sheath) of the composite insulator into cylindrical short samples with the length of 30mm, boiling 6 short samples in boiling water containing 0.1% of NaCl by mass percent for 100h, wiping the samples, adding 12kV high voltage for 1min by using brass electrodes with specific sizes on the upper plane and the lower plane of the cylindrical samples, and recording the leakage current passing through the samples in the process. Current standards require that the leakage current should be no greater than 0.1 mA. Because the tested sample is the composite insulator core rod with the sheath, the leakage current obtained by the test can flow through the following three paths: 1. the outer surface of the silicon rubber sheath; 2. the glass fiber epoxy core rod is arranged inside the glass fiber epoxy core rod; 3. glass fiber/epoxy interface. When the diameter of the tested core rod is increased, the current leaked from the core rod is increased, so that it is not reasonable to measure the interfaces of all the core rods by using the same index (the leakage current is less than or equal to 0.1 mA).
In addition, for the interface performance evaluation of composite insulators, it is currently the most important to obtain the current leakage from the glass fiber/epoxy interface. However, the conventional method cannot effectively distinguish the magnitude of the current leaked from the inside of the glass fiber epoxy core rod and the glass fiber/epoxy interface, so that the test result is greatly influenced by the size of the core rod.
Disclosure of Invention
The invention aims to provide a method and a device for testing the interface resistivity of a composite insulator sheath and a core rod, which can distinguish the leakage current of a glass fiber/epoxy interface, and simultaneously correct the size of a cylindrical core rod to detect the interface resistivity of the composite insulator sheath and the core rod to be tested, realize quantitative evaluation of the electrical performance of the composite insulator sheath and the core rod interface by using the interface resistivity, and realize description of the interface state of the composite insulator sheath and the core rod of core rods with different diameters by using a single physical quantity (interface resistivity).
In order to achieve the above object, an embodiment of the present invention provides a method for testing interfacial resistivity of a composite insulator sheath and a core rod, including:
obtaining leakage current I of the sheath and core rod interface when the composite insulator to be tested is loaded with test voltage2；
According to the height d of the composite insulator to be tested, the section perimeter c and the leakage current of the sheath and core rod interfaceI2And obtaining the interfacial resistivity of the sheath and the core rod of the composite insulator to be tested by using an interfacial resistivity calculation formula.
In a specific embodiment, the leakage current I at the interface between the sheath and the core rod of the composite insulator to be tested is obtained2The method specifically comprises the following steps:
respectively detecting leakage current I of core rod when the composite insulator to be detected is provided with the sheath0And leakage current I of the core rod when the sheath is removed1And calculating the leakage current I of the sheath and core rod interface according to the following formula2；
I2＝I0-I1 (1)。
In a specific embodiment, the leakage current I of the core rod is detected when the composite insulator to be tested is sheathed with the sheath respectively0And leakage current I of the core rod when the sheath is removed1Before, still include:
removing the dirt on the surface of the sheath.
In a specific embodiment, the formula for calculating the interfacial resistivity specifically includes:
rho is the interfacial resistivity of the sheath and the core rod of the composite insulator to be tested, U is the test voltage loaded at two ends of the composite insulator to be tested, and I2D and c are the height and the section perimeter of the composite insulator to be detected respectively.
In a specific embodiment, the method further comprises:
and respectively obtaining the height d and the section perimeter c of the composite insulator to be detected.
The embodiment of the invention also provides a device for testing the interfacial resistivity of the composite insulator sheath and the core rod, which is applied to the method for testing the interfacial resistivity of the composite insulator sheath and the core rod in any one of the embodiments, and the device comprises:
the test power supply comprises test electrodes, wherein the test electrodes are loaded at two ends of the composite insulator to be tested so as to generate test voltage for the composite insulator to be tested;
a leakage current detector for detecting the leakage current I of the core rod when the composite insulator to be detected is provided with the sheath0And leakage current I of the core rod when the sheath is removed1。
In one embodiment, the test electrode generates a test voltage of 12 kV.
In a specific embodiment, the testing apparatus further includes a peeler, and the peeler is configured to remove the sheath of the composite insulator to be tested.
In one embodiment, the peeler includes a knife.
According to the method and the device for testing the interfacial resistivity of the composite insulator sheath and the core rod, disclosed by the embodiment of the invention, the interfacial resistivity is calculated by testing the leakage current of the sheath and the core rod interface, and then the interfacial resistivity is calculated by adding the interfacial current for size correction, so that the method and the device can be used for evaluating the interfacial states of the composite insulator sheath and the core rod with different diameters. Therefore, compared with the prior art, the invention has the following advantages:
1. the method realizes quantitative evaluation of the electrical performance of the composite insulator sheath and core rod interface by adopting the interface resistivity, is suitable for practical application scenes in the electric power field, for example, can test a cylindrical sample of a practical finished composite insulator instead of an initial flat sample, and is more accurate in detection;
2. the size correction of the core rod is added, the condition of the composite insulator sheath and the core rod interface of the core rods with different diameters is described by using a single physical quantity (interface resistivity), and the testing method is simple and easy to popularize.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for testing interfacial resistivity of a composite insulator sheath and a core rod according to an embodiment of the present invention;
FIG. 2 shows leakage current I at the interface between the sheath and the core rod according to an embodiment of the present invention2A schematic diagram of a calculation principle;
fig. 3 is a schematic operation flow chart of a method for testing the interfacial resistivity of the composite insulator sheath and the core rod according to an embodiment of the present invention;
FIG. 4 is a schematic illustration of the principle of interfacial resistivity calculation provided by one embodiment of the present invention;
fig. 5 is a schematic structural diagram of a device for testing the interfacial resistivity of the composite insulator sheath and the core rod according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the step numbers used herein are for convenience of description only and are not used as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present invention provides a method for testing interfacial resistivity of a composite insulator sheath and a core rod, including the following steps:
s10, obtaining leakage current I of the sheath and core rod interface when the composite insulator to be tested is loaded with test voltage2。
In this embodiment, the composite insulator to be tested (also referred to as a sample to be tested) is a 30mm high sheath and core rod short sample required in the standard GB/T19519-2014.
In a specific embodiment, the step S10 obtains the leakage current I of the interface between the sheath and the core rod of the composite insulator to be tested2The method specifically comprises the following steps:
s11, respectively detecting leakage current I of the core rod when the composite insulator to be detected is provided with the sheath0And leakage current I of the core rod when the sheath is removed1And calculating the leakage current I of the sheath and core rod interface according to the following formula2；
I2＝I0-I1 (1)。
Referring to fig. 2, when a test voltage is applied to two ends of a sample to be tested, there are three paths for leakage current to travel, which are a core rod, a sheath, and a sheath-core rod interface. As shown in fig. 2, the three paths are equivalent to a resistor, wherein the volume resistivity of the core rod is smaller after the core rod is boiled (the interface performance of the composite insulator can be reduced by high-temperature boiling to measure the leakage current of the core rod), and the experimental measured value is 106Omega.m, the silicone rubber sheath has good water resistance, large volume resistivity and theoretical value of 109Omega · m or more. Therefore, it can be judged that when the surface of the silicone rubber is not contaminated, the leakage current I thereof3Will be much less than the leakage current I of the core rod1. The total leakage current of the core rod with the sheath is obtained only through testingI0Leakage current I of core rod without sheath1The leakage current I at the sheath and the core rod can be obtained2：
I2＝I0-I1 (1)
Sheath leakage current I3Very small and negligible.
Referring to FIG. 3, the total leakage current I is obtained by using a sheathed core rod0(ii) a Then, the silicon rubber sheath is cut off, and the leakage current I of the core rod is obtained by testing the same testing device and conditions1At this time (I)0-I1) I.e. leakage current I at the interface of the sheath and the core rod2。
Referring to fig. 3, in an embodiment, in the step S11, the leakage current I of the core rod is detected when the composite insulator to be tested is covered by the tape sheath respectively0And leakage current I of the core rod when the sheath is removed1Before, the method also comprises the following steps:
removing the dirt on the surface of the sheath.
The test flow is shown in fig. 3, and the surface contamination is removed before the test to eliminate the influence of the surface contamination.
S20, according to the height d of the composite insulator to be tested, the section perimeter c and the leakage current I of the sheath and core rod interface2And obtaining the interfacial resistivity of the sheath and the core rod of the composite insulator to be tested by using an interfacial resistivity calculation formula.
In a specific embodiment, the formula for calculating the interfacial resistivity specifically includes:
rho is the interfacial resistivity of the sheath and the core rod of the composite insulator to be tested, U is the test voltage loaded at two ends of the composite insulator to be tested, and I2D and c are the height and the section perimeter of the composite insulator to be detected respectively.
As shown in fig. 4, the interface between the sheath and the core rod can be geometrically equivalent to a cylinder, and the cylinder is expanded along the height to obtain a rectangle with a length c (the perimeter of the cylinder cross-section circle) and a width d (the cylinder height), and the resistivity of the interface between the sheath and the core rod can be equivalent to the surface resistivity of the rectangle. Derivation is performed according to the rectangular surface resistivity formula to obtain the calculation formula of the interface resistivity of the cylinder in fig. 4, see formula (2).
In a specific embodiment, the testing method further comprises the following steps:
and respectively obtaining the height d and the section perimeter c of the composite insulator to be detected.
To better understand the embodiment of the present invention, the composite insulator with the core rod diameter of 18mm and 24mm is used for testing, and the sheath-core rod interface resistivity of 18mm and 24mm is calculated by using the formula (2), and the results are shown in table 1.
TABLE 1 results of testing interfacial resistivity of sheath and core rod for different core rod diameters
As can be seen from the above table, the calculated resistivities of the jacket and core rod interface at 18mm and 24mm are both 109In the order of Ω, it can be seen that the sheath-core interfacial resistivity is independent of the core diameter. It can be further understood that the interface resistivity is a physical quantity independent of the shape of the sample to be measured (the cross section is circular, quadrangular, etc.), and is related to the height d, the cross-sectional perimeter c, and the test voltage U of the sample to be measured.
Referring to fig. 5, an embodiment of the present invention further provides a testing apparatus 100 for testing the interfacial resistivity of the sheath and the core rod of the composite insulator, which is applied to the testing method for the interfacial resistivity of the sheath and the core rod of the composite insulator 200 in any of the above embodiments, where the testing apparatus 100 includes a testing power supply 10 and a leakage current detector 20.
The test power supply 10 comprises a test electrode 11, wherein the test electrode 11 is loaded at two ends of the composite insulator 200 to be tested so as to be aligned with the composite insulatorThe composite insulator 200 to be tested generates a test voltage. A leakage current detector 20 for detecting the leakage current I of the core rod when the composite insulator 200 to be detected is provided with the sheath0And leakage current I of the core rod when the sheath is removed1。
In the embodiment of the present invention, the test electrodes 11 are loaded at two ends of the composite insulator 200 to be tested, and generate a test voltage to the test electrodes, so that the generated leakage current sequentially passes through the core rod, the sheath, and the sheath-core rod interface of the composite insulator 200. The leakage current detector 20 detects the leakage current I of the cored bar with the sheath0And leakage current I of the core rod when the sheath is removed1And the user can calculate the resistivity of the interface between the sheath and the core rod of the composite insulator 200 to be measured by the formula (2). The testing device 100 of the embodiment of the invention is simple, can test the actual cylindrical sample of the finished composite insulator 200, and has accurate detection.
In one embodiment, the test electrode 11 generates a test voltage of 12 kV.
In a specific embodiment, the testing apparatus 100 further includes a peeler for removing the sheath of the composite insulator 200 to be tested.
In this embodiment, the silicone rubber sheath can be removed by a stripper to detect the leakage current I of the mandrel bar when the sheath is removed1。
In one embodiment, the peeler includes a knife.
In summary, in the method and apparatus 100 for testing the interfacial resistivity of the composite insulator sheath and the core rod according to the embodiment of the present invention, the interfacial resistivity is calculated by testing the leakage current at the interface between the sheath and the core rod, and then the interfacial resistivity is calculated by adding the interfacial current for size correction, so that the method and apparatus can be used for evaluating the interfacial states of the sheath and the core rod of the composite insulator 200 with different diameters. Therefore, compared with the prior art, the invention has the following advantages:
1. the method realizes quantitative evaluation of the electrical performance of the composite insulator 200 sheath and core rod interface by adopting the interface resistivity, is suitable for practical application scenes in the electric power field, for example, can test a cylindrical sample of a practical finished composite insulator 200 instead of an initial flat sample, and has more accurate detection;
2. the size correction of the core rod is added, the condition of the composite insulator 200 sheath and core rod interface of the core rods with different diameters is described by using a single physical quantity (interface resistivity), and the testing method is simple and easy to popularize.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. A method for testing the interfacial resistivity of a composite insulator sheath and a core rod is characterized by comprising the following steps:
obtaining leakage current I of the sheath and core rod interface when the composite insulator to be tested is loaded with test voltage2；
According to the height d of the composite insulator to be tested, the section perimeter c and the leakage current I of the sheath and core rod interface2And obtaining the interfacial resistivity of the sheath and the core rod of the composite insulator to be tested by using an interfacial resistivity calculation formula.
2. The method for testing the resistivity of the interface of the composite insulator sheath and the core rod as claimed in claim 1, wherein the leakage current I of the interface of the composite insulator sheath and the core rod to be tested is obtained2The method specifically comprises the following steps:
respectively detecting leakage current I of core rod when the composite insulator to be detected is provided with the sheath0And leakage current I of the core rod when the sheath is removed1And calculating the leakage current I of the sheath and core rod interface according to the following formula2；
I2＝I0-I1 (1)。
3. The method for testing the interfacial resistivity of the composite insulator sheath and the core rod according to claim 2, wherein the method is applied to a test site where the resistivity of the composite insulator sheath and the core rod is measuredRespectively detecting the leakage current I of the core rod when the composite insulator to be detected is provided with the sheath0And leakage current I of the core rod when the sheath is removed1Before, still include:
removing the dirt on the surface of the sheath.
4. The method for testing the interfacial resistivity of the composite insulator sheath and the core rod according to claim 1, wherein the formula for calculating the interfacial resistivity is as follows:
rho is the interfacial resistivity of the sheath and the core rod of the composite insulator to be tested, U is the test voltage loaded at two ends of the composite insulator to be tested, and I2D and c are the height and the section perimeter of the composite insulator to be detected respectively.
5. The method for testing the interfacial resistivity of the composite insulator sheath and the core rod according to claim 1, further comprising:
and respectively obtaining the height d and the section perimeter c of the composite insulator to be detected.
6. A device for testing the interfacial resistivity of a composite insulator sheath and a core rod is applied to the method for testing the interfacial resistivity of the composite insulator sheath and the core rod according to any one of claims 1 to 5, and the device comprises:
the test power supply comprises test electrodes, wherein the test electrodes are loaded at two ends of the composite insulator to be tested so as to generate test voltage for the composite insulator to be tested;
a leakage current detector for detecting the leakage current I of the core rod when the composite insulator to be detected is provided with the sheath0And leakage current I of the core rod when the sheath is removed1。
7. The apparatus for testing the interfacial resistivity of the composite insulator sheath and the core rod as claimed in claim 6, wherein the test electrode generates a test voltage of 12 kV.
8. The apparatus for testing the interfacial resistivity of the composite insulator sheath and the core rod according to claim 6, further comprising a stripper for removing the sheath of the composite insulator to be tested.
9. The apparatus for testing the interfacial resistivity of a composite insulator sheath and mandrel as claimed in claim 8, wherein the stripper includes a cutter.
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| CN114089062A (en) * | 2021-11-15 | 2022-02-25 | 广东电网有限责任公司 | Interface performance detection method and device |
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Application publication date: 20210423 |