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Device and method for measuring electrical strength of material under stress condition

A technology of electrical strength and testing device, applied in the direction of testing dielectric strength, etc., can solve the problems of component fracture, decreased bearing capacity of insulating materials, stress concentration, etc., to reduce negative effects and improve relative electrical strength.

Inactive Publication Date: 2013-08-28
NAT UNIV OF DEFENSE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that stress will affect the insulation properties of materials, but there are few reports on the stress on the electrical strength of insulating materials.
[0003] In addition, when the electrical breakdown of the insulating member occurs, cracks and holes will be generated at the electrical breakdown. Such defects will cause stress concentration, resulting in a sharp drop in the bearing capacity of the insulating material.
The insulating material used as a component often needs to carry a large external load. After the electrical breakdown crack and hole are formed, due to the influence of stress concentration, the crack will expand rapidly and continuously, and even eventually lead to the fracture of the component, resulting in serious Insulation accident

Method used

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  • Device and method for measuring electrical strength of material under stress condition
  • Device and method for measuring electrical strength of material under stress condition
  • Device and method for measuring electrical strength of material under stress condition

Examples

Experimental program
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Effect test

Embodiment 1

[0038] a kind of like figure 1 The device for determining the electric strength of materials under stress conditions is shown, which can be used to test the electric strength of materials under tensile conditions. The test device 4 and the stress generation system 5, the test electrodes 3 are installed on both sides of the test sample 2 and connected to the electric strength test device 4 through the electrode leads 31, the stress generation system 5 includes a clamp for clamping the test sample 2 Device 51.

[0039] In this embodiment, the upper end of the insulating oil barrel 1 is open, and the lower end is covered with a flexible insulating material. rubber film). The flexible insulating material is cut to a suitable size, and its outer edge is sealed and connected to the bottom of the side wall of the insulating oil barrel 1 through a sealing material. There is a small opening in the center, and the sample to be tested can be sealed and connected to the opening through ...

Embodiment 2

[0044] A method of material electric strength under the device test stress condition of embodiment 1, comprises the following steps:

[0045] (1) Sample installation: Prepare the shape as figure 2 , image 3 Several tensile test specimens of the acrylic unsaturated polyester resin 9001 cast body shown (the specimen size must meet the requirements of both the tensile or compression test and the insulation withstand voltage test, and its size is: L=220mm; L 0 =90;L 1 =100; L 3 =140mm; b=40; b 1 =60; thickness d is 2mm); the test sample 2 is packaged in the insulating oil barrel 1 of the above device, and the test electrodes 3 are symmetrically installed on both sides of the test sample 2; the insulating oil barrel 1 is clamped at the place where the stress occurs On the clamping device 51 of the system 5;

[0046] (2) System connection: clamp the test sample 2 on the clamping device 51, use sealant to connect the lower clamp 512 of the clamping device 51 with the bottom o...

Embodiment 3

[0051] A method of material electric strength under the device test stress condition of embodiment 1, comprises the following steps:

[0052] (1) Sample installation: Prepare the shape as Figure 5 , Figure 6 Several longitudinal tensile test specimens of the unidirectional glass fiber reinforced acrylic unsaturated polyester resin 9001 composite material (the size of which is as follows Figure 5 , Figure 6 Shown: L=400mm; L 0 =240mm; L 2 =280mm; b=40mm; d=3mm); the test sample 2 is packaged in the insulating oil barrel 1 of the above device, and the test electrode 3 is symmetrically installed on both sides of the test sample 2; the insulating oil barrel 1 is clamped on the clamping device 51 of the stress generating system 5;

[0053] (2) System connection: clamp the test sample 2 on the clamping device 51, use sealant to connect the lower clamp 512 of the clamping device 51 with the bottom of the insulating oil drum 1 reliably and seal, and the upper clamping device ...

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Abstract

The invention discloses a device and method for measuring the electrical strength of material under the stress condition. The device comprises an insulating oil tank used for encapsulating a sample to be tested, test electrodes, an electrical strength testing device and a stress generation system, wherein the test electrodes are arranged at the two sides of the sample to be tested and are connected with the electrical strength testing device by electrode leads; and the stress generation system comprises a clamping device used for clamping the sample to be tested. The method for measuring the electrical strength of the material under the stress condition comprises the following steps of: firstly encapsulating the sample in the insulating oil tank, and installing the test electrodes; then, leading the sample to be clamped on the stress generation system and connected with the electrical strength testing device, and fully filling insulating oil; starting the stress generation system for providing a load; after that, starting the electrical strength testing device, and recording the voltage values of the tested sample which is broken down along with the rise of output voltage; and finally, obtaining the electrical strength of the sample. The measurement device is simple in structure and convenient in assembly and operation, the test method is simple and convenient, the test cost is lower, and test results is accurate.

Description

technical field [0001] The invention relates to a test device and a test method for electric strength, in particular to a test device and a test method for electric strength under stress conditions. Background technique [0002] Due to the requirements of insulation technology, insulating materials must not only be used as functional materials and have excellent insulating properties, but also be used as structural materials and need to carry certain external loads. For example: the insulators used on high-voltage electric towers not only need to play the role of high-voltage insulation, but also need to bear the gravity of high-voltage cables and the tensile stress caused by sag; It also needs to bear the negative pressure caused by the aerodynamics of the train running at high speed, and the impact of gas generated when the train meets or enters the tunnel. Studies have shown that stress will affect the insulation properties of materials, but there are few reports on the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
Inventor 于涛刘钧肖加余邢素丽邬志华谭艳田芳罗赞才
Owner NAT UNIV OF DEFENSE TECH
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