Intelligent temperature-adjusting and voltage-adjusting XLPE (cross-linked polyethylene) cable insulation material performance tester

Abstract

The invention relates to an intelligent temperature-adjusting and voltage-adjusting XLPE (cross-linked polyethylene) cable insulation material performance tester. The tester has the technical characteristics of comprising two cup bodies of which the bottoms are provided with round openings, the bottoms of the two cup bodies are jointly connected back to back in a rotational thread mode, the cup openings and cup covers of the cup bodies are installed together in a thread mode, each cup body is internally filled with a Nacl solution to serve as a conducting medium, the surfaces of the cup bodiesare provided with small holes which are used for enabling two high-voltage electrodes to stretch into the interiors of the two cup bodies, the high-voltage electrodes and a voltage-increasing deviceare mutually connected, the center of each cup cover is provided with a heating device which stretches into a cup body, the heating device is connected with a heating and control device and a batterypower source through a communication unit. The tester is reasonable in design, the error factors caused by different test conditions are eliminated, the voltage-resistant strength of XLPE in differentenvironmental temperature can be accurately tested, the goodness and badness of the insulation performance of an XLPE sample can be more accurately reflected, and the tester can be widely used for testing the insulation performance of the XLPE.

Description

technical field [0001] The invention belongs to the technical field of cross-linked polyethylene insulation performance testing, in particular to an intelligent temperature-regulating and voltage-regulating XLPE cable insulating material performance tester. Background technique [0002] The insulation condition of cross-linked polyethylene (XLPE) cables has always been the focus of engineering and technical personnel. Since XLPE with different cross-linking processes has many different electrical insulation properties, it is necessary to pay attention to the differences in electrical properties. The difference in electrical insulation properties of XLPE made by different crosslinking processes is particularly significant under higher operating temperature environments. XLPE is a semi-crystalline polymer material, and its melting temperature is not high. Under relatively high temperature conditions, due to the semi-crystalline physical properties of XLPE, its insulation perf...

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Problems solved by technology

[0003] At present, most of the devices used to test the insulation performance of XLPE use metal electrode structures. The electrodes at the high-voltage end use a needle-shaped structure with a certain curvature radius or a long linear structure, and the low-voltage end uses a disc-shaped structure. The samples are tested in an insulating oil bath. Insulation performance evaluation, the advantages of the above-mentioned device are: easy process, simple manufacture, and easy to realize functions, but there are also the following disadvantages: (1) Since the electrode adopts a metal electrode structure, the high-voltage electrode adopts a needle-shaped structure or a long line with a certain curvature radius When a high voltage is applied to the sample, the surface of the high voltage side of the sample often has a small contact area with the electrode and the local field strength is too high, resulting in breakdown along the surface, which affects the test; (2) the breakdown point of the sample It is often not located in the contact area between the high-voltage electrode and the surface of the sample. In this case, the breakdown field strength cannot be simply equivalent to the result of dividing the voltage by the test thickness, and there are large errors in the judgment of the test results; (3) using the The temperature sensor is pre-buried inside the oil bath for temperature measurement. Due to the high density of the insulating oil, the slow fluidity of the oil body during the heating process will cause uneven temperature throughout the interior. It is difficult for the temperature sensor to obtain the real temperature, resulting in errors in test results.

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