CN115468850A - Method for testing tensile strength of GIS insulating pull rod pipe fitting - Google Patents
Method for testing tensile strength of GIS insulating pull rod pipe fitting Download PDFInfo
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- CN115468850A CN115468850A CN202211126646.5A CN202211126646A CN115468850A CN 115468850 A CN115468850 A CN 115468850A CN 202211126646 A CN202211126646 A CN 202211126646A CN 115468850 A CN115468850 A CN 115468850A
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- 238000012360 testing method Methods 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000004804 winding Methods 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 5
- 238000010998 test method Methods 0.000 claims description 5
- 238000003754 machining Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 2
- 238000000691 measurement method Methods 0.000 claims description 2
- 238000009864 tensile test Methods 0.000 abstract description 7
- 238000009413 insulation Methods 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 2
- 238000012545 processing Methods 0.000 description 3
- 229920006231 aramid fiber Polymers 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a method for testing the tensile strength of a GIS insulating pull rod pipe fitting, which is technically characterized by comprising the following steps of: thinning the GIS insulating pull rod, installing hardware fittings at two ends of the GIS insulating pull rod, and preparing test samples with thick walls at two ends and thin wall in the middle; testing the tensile strength of the test sample to obtain the tensile strength of the test sample; and the tensile strength of the GIS insulating pull rod in the original size is converted by comparing the sectional area of the middle thin wall with the sectional area of the GIS insulating pull rod in the original size. The design is reasonable, the insulation pull rod is made into a test sample with thick walls at two ends and thin wall in the middle, then the traditional tensile testing machine is used for testing the tensile strength of the test sample, and finally the sectional area conversion method is used for obtaining the tensile strength of the GIS insulation pull rod in the original size based on the test result.
Description
Technical Field
The invention belongs to the technical field of high-voltage equipment, relates to a GIS (gas insulated switchgear) insulating pull rod, and particularly relates to a method for testing the tensile strength of a GIS insulating pull rod pipe fitting.
Background
High-voltage GIS is formed by SF 6 The high-voltage distribution device is formed by combining high-voltage electrical equipment such as a circuit breaker, an isolation disconnecting link and the like by using gas as an insulating medium. The high-voltage GIS is the best equipment for converting the electric energy of the ultra-high voltage transformer substation due to the advantages of compact structure, high reliability, convenient maintenance and the like, and is widely applied to power transmission and transformation projects in China.
The insulated tie is a key component in (ultra) high voltage GIS circuit breakers, called the "arm" of the breaker. The movement can be transmitted from the grounding part to the high-potential part to realize the on-off of the electrical connection, and the device plays an extremely important role in the working process of the GIS. In the operation process of the insulating pull rod, due to frequent mechanical operation and large tensile load, the mechanical performance of the insulating pull rod is greatly required. Along with the promotion of voltage class and the increase of circuit breaker capacity, the length and the thickness of insulating pull rod constantly increase, and required tensile strength also constantly increases to main insulating pull rod in the special high voltage GIS circuit breaker for example, its tensile strength requirement can reach more than 300kN, and this has provided huge challenge to the test and the performance evaluation of dispatching from the factory of insulating pull rod. Traditional insulating pull rod tensile strength test relies on tensile testing machine to go on, because the pull rod pipe wall is thicker, tensile strength is big more the requirement to tensile testing machine just is higher, especially to the insulating pull rod for extra-high voltage GIS, consequently current tensile testing machine has been difficult to satisfy the test demand to its tensile strength, need customize the upgrading according to the parameter requirement, its is with high costs and the suitability is poor, need provide a new equivalent test method urgently for can carry out the tensile strength test of the long pull rod of thick pipe wall on traditional tensile testing machine basis.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a method for testing the tensile strength of a GIS insulating pull rod pipe fitting, and solves the problem that a traditional tensile testing machine cannot test the tensile strength of a thick-pipe-wall high-strength insulating pull rod.
The invention solves the technical problems in the prior art by adopting the following technical scheme:
a test method for tensile strength of a GIS insulating pull rod pipe fitting comprises the following steps:
step 1, thinning a GIS insulating pull rod, installing hardware fittings at two ends of the GIS insulating pull rod, and preparing a test sample with thick walls at two ends and a thin wall in the middle;
step 2, carrying out tensile strength test on the test sample obtained in the step 1 to obtain the tensile strength of the test sample;
and 3, according to the test result in the step 2, comparing the sectional area of the middle thin wall with the sectional area of the GIS insulating pull rod in the original size, and converting the tensile strength of the GIS insulating pull rod in the original size.
Further, thinning processing is carried out to GIS insulating pull rod and one of following two kinds of mode is adopted:
the method comprises the following steps of performing thinning treatment by adopting a machining mode: placing the GIS insulating pull rod on a machine tool, and mechanically cutting and thinning the middle part of the GIS insulating pull rod;
the thinning treatment is carried out by adopting a winding forming mode: in the winding process of the GIS insulating pull rod, fiber cloth with different widths is adopted to wind the GIS insulating pull rod, so that the GIS insulating pull rod with a thin middle part and two thick sides is formed, and the thickness of the pipe wall of each of two ends of the GIS insulating pull rod is the same as that of the pipe wall of the GIS insulating pull rod with the original size.
Furthermore, the middle thin wall is positioned in the middle of the GIS insulating pull rod, the thinning length is 5-30% of the total length of the GIS insulating pull rod, and the thickness of the pipe wall is reduced to 30-60% of the thickness of the original pipe wall.
Further, the specific implementation method of the step 2 comprises the steps of measuring the size of the test sample, cleaning the surface, installing and testing the test sample, and recording the tensile strength measurement.
Further, the measurement method of the size of the test sample comprises the following steps: measuring and recording the diameters of a plurality of test points of a test sample along the length direction of the test sample by using a micrometer, wherein the test points comprise: 3 test points arranged on the middle thin wall and 2 test points respectively arranged on the thick walls at the two ends, and recording the minimum value and the average value of the measurement of the middle thin wall and the thick walls at the two ends.
Further, in the step 3, the tensile strength of the GIS insulation pull rod in the original size is converted by adopting the following method:
wherein
The tensile strength of the GIS insulating pull rod in the original size is obtained,
in order to test the tensile strength of the sample,kin order to scale the scaling factor,
is the sectional area of the GIS insulating pull rod in the original size,
the cross-sectional area of the middle thin wall.
Further, the conversion ratio coefficient k is 0.9 to 0.95.
The invention has the advantages and positive effects that:
the invention has reasonable design, the insulated pull rod is made into a test sample with thick walls at two ends and thin wall in the middle, then the traditional tensile testing machine is used for testing the tensile strength of the test sample, and finally the sectional area conversion method is used for obtaining the tensile strength of the GIS insulated pull rod with the original size based on the test result.
Drawings
FIG. 1 is a schematic view of the structure of a test sample prepared according to the present invention.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings.
A test method for tensile strength of a GIS insulating pull rod pipe fitting comprises the following steps:
step 1, thinning the GIS insulating pull rod, installing hardware fittings at two ends of the GIS insulating pull rod, and preparing a test sample with thick walls at two ends and a thin wall in the middle.
In the step, the thinning treatment of the GIS insulating pull rod means that the wall thicknesses of the tube walls at the two ends of the insulating pull rod are kept unchanged, the tube wall thickness of the middle part of the insulating pull rod is smaller than that of the two ends through a machining or winding forming scheme, the tube wall thinning position is located at the middle position of the GIS insulating pull rod, the thinning length is 5-30% of the total length of the GIS insulating pull rod, and the tube wall thickness is reduced to 30-60% of the original tube wall thickness. And (3) after the pipe wall of the insulating pull rod is thinned, bonding hardware fittings at two ends of the insulating pull rod, and finally obtaining a test sample.
As shown in fig. 1, the length of the original GIS insulating tie rod of this embodiment is 700mm, including the thinned portion (middle thin wall) of 100mm, and the lengths of the original tie rod portions at both sides are 300mm, respectively; the inner diameter of the GIS insulating pull rod pipe fitting in the original size is 25mm, the pipe wall thickness is 16mm, the inner diameter of a thinned part (middle thin wall) is 25mm, and the pipe wall thickness is reduced to 6mm; the length of the bonding part of the hardware at the two ends and the pull rod is 150mm, the outer diameter of the hardware is 56mm, and the total length of the tested pull rod sample is finally 900mm.
The invention adopts the test sample, which not only ensures the effectiveness of the subsequent tensile strength test and equivalent calculation of the tensile strength of the insulating pull rod, but also greatly reduces the parameter requirements of the high-strength insulating pull rod with thick pipe wall on the tensile tester and reduces the test cost of manufacturers or scientific research institutions.
In this embodiment, carry out attenuate processing including machine tooling and winding forming two kinds of modes to GIS insulating pull rod:
(1) The machining mode is that a machine tool is adopted to thin and cut the middle part of the GIS insulation pull rod, and the processing process is as follows: the GIS insulating pull rod is placed on a machine tool, the length of 100mm in the middle of the GIS insulating pull rod is mechanically cut and thinned according to the size shown in figure 1, the thickness of the GIS insulating pull rod is thinned to about 6mm from 16mm, chamfers are formed on the thick pipe wall and the thin pipe wall, and the radius R1 is 10mm.
(2) The winding forming mode is that fiber cloth with different widths is adopted to wind the GIS insulating pull rod in the winding process of the GIS insulating pull rod, and then a pull rod sample with a thin middle and thick two sides is formed. In this embodiment, aramid fiber cloth with a width of 700mm is first wound into pipes with inner/outer diameters of 25 and 31mm, respectively, and then aramid fiber cloth with a width of 300mm is wound on both sides, respectively, to form pipes with inner/outer diameters of 25 and 41mm, respectively, so that a special test sample with a middle thin wall thickness of 6mm and pipe walls with two sides thickness of 16mm is formed.
And 2, testing the tensile strength of the test sample obtained in the step 1 to obtain the tensile strength of the test sample.
The specific test process of the step comprises the processes of measuring and recording the size of a test sample, cleaning the surface, installing, starting a machine, measuring and recording the tensile strength and the like. The specific process is as follows:
(1) The diameters of a plurality of points of the test sample along the length direction are measured and recorded by a micrometer, in the embodiment, the diameters of the 7 points are measured totally, the test points comprise 3 test points arranged on the middle thin wall and 2 test points respectively arranged on the thick walls at the two ends, and the minimum value and the average value of the measurement of the middle thin wall and the thick walls at the two ends are respectively recorded.
(2) The ends and the holding surfaces of the sample were wiped with a nonwoven fabric soaked with absolute ethanol to remove any foreign matter that may cause measurement errors.
(3) The test specimen is mounted in the grip of the tester, taking care to align the long axis of the specimen with the long axis of the machine grip.
(4) The machine was started and run at a speed, in this example 5mm/min.
(5) And (4) continuing the test until the test sample is broken to obtain the tensile strength (breaking load), the stress-strain curve, the elongation and the like of the test sample.
And 3, according to the test result in the step 2, comparing the sectional area of the middle thin wall with the sectional area of the GIS insulating pull rod in the original size, and converting the tensile strength of the GIS insulating pull rod in the original size.
In the step, the tensile strength of the GIS insulating pull rod in the original size is converted through the following formula:
wherein
The tensile strength of the GIS insulating pull rod with the original size is obtained,
in order to test the tensile strength of the sample,ktaking 0.9 to 0.95 as a conversion ratio coefficient,
the sectional area of the GIS insulation pull rod in the original size is calculated by the following steps:
In the embodiment, the measured rupture force value of the middle thin wall of the insulating pull rod is about 80kN, and the sectional area of the middle thin wall
Is composed of
The cross section area of the original pull rod is
，kThe value of the original breaking force of the tie rod is about 239 kN which can be converted according to the formula (1) by taking 0.95.
It should be emphasized that the embodiments described herein are illustrative rather than restrictive, and thus the present invention is not limited to the embodiments described in the detailed description, but also includes other embodiments that can be derived from the technical solutions of the present invention by those skilled in the art.
Claims (7)
1. A test method for tensile strength of a GIS insulating pull rod pipe fitting is characterized by comprising the following steps: the method comprises the following steps:
step 1, thinning a GIS insulating pull rod, installing hardware fittings at two ends of the GIS insulating pull rod, and preparing a test sample with thick walls at two ends and a thin wall in the middle;
step 2, carrying out tensile strength test on the test sample obtained in the step 1 to obtain the tensile strength of the test sample;
and 3, according to the test result in the step 2, comparing the sectional area of the middle thin wall with the sectional area of the GIS insulating pull rod in the original size, and converting the tensile strength of the GIS insulating pull rod in the original size.
2. The method for testing the tensile strength of the GIS insulating pull rod pipe fitting according to claim 1, wherein the method comprises the following steps: the thinning treatment of the GIS insulating pull rod adopts one of the following two modes:
the method comprises the following steps of performing thinning treatment by adopting a machining mode: placing the GIS insulating pull rod on a machine tool, and mechanically cutting and thinning the middle part of the GIS insulating pull rod;
the thinning treatment is carried out by adopting a winding forming mode: in the winding process of the GIS insulating pull rod, fiber cloth with different widths is adopted to wind the GIS insulating pull rod, so that the GIS insulating pull rod with a thin middle part and two thick sides is formed, and the thickness of the pipe wall of each of two ends of the GIS insulating pull rod is the same as that of the pipe wall of the GIS insulating pull rod with the original size.
3. The method for testing the tensile strength of the GIS insulating pull rod pipe fitting according to claim 1, wherein the method comprises the following steps: the middle thin wall is positioned in the middle of the GIS insulating pull rod, the reduction length is 5-30% of the total length of the GIS insulating pull rod, and the thickness of the pipe wall is reduced to 30-60% of the thickness of the original pipe wall.
4. The method for testing the tensile strength of the GIS insulating pull rod pipe fitting according to any one of claims 1 to 3, characterized by comprising the following steps: the specific implementation method of the step 2 comprises the steps of measuring the size of the test sample, cleaning the surface, installing and testing the test sample and recording the tensile strength measurement.
5. The test method for the tensile strength of the GIS insulating pull rod pipe fitting according to claim 4, characterized in that: the measurement method of the size of the test sample comprises the following steps: measuring and recording the diameters of a plurality of test points of a test sample along the length direction of the test sample by using a micrometer, wherein the test points comprise: 3 test points arranged on the middle thin wall and 2 test points respectively arranged on the two end thick walls, and recording the minimum value and the average value of the measurement of the middle thin wall and the two end thick walls.
6. The method for testing the tensile strength of the GIS insulating pull rod pipe fitting according to any one of claims 1 to 3, wherein the method comprises the following steps: and 3, converting the tensile strength of the GIS insulating pull rod in the original size by adopting the following method:
wherein
The tensile strength of the GIS insulating pull rod in the original size is obtained,
is a test sampleThe tensile strength of the product is improved,kin order to scale the scaling factor,
is the sectional area of the GIS insulating pull rod in the original size,
the cross-sectional area of the middle thin wall.
7. The method for testing the tensile strength of the GIS insulating pull rod pipe fitting according to claim 6, wherein the method comprises the following steps: the scaling factor k is 0.9 to 0.95.
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