Test method for simulating dielectric strength attenuation and withstand voltage of long-term operation cable
A dielectric strength, long-term operation technology, applied in the direction of testing dielectric strength, measuring electricity, measuring devices, etc., can solve problems such as ineffective control of electrical properties, and achieve the effect of loose testing
Active Publication Date: 2020-11-03
JIANGSU ZHONGLI GRP CO LTD
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Problems solved by technology
The test eye method in the existing cables cannot effectively control the problems in the electrical properties of different batches of materials from suppliers during subsequent use
Method used
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Embodiment Construction
[0030] Such as figure 1 As shown, the test method for simulating long-term operation cable dielectric strength attenuation and withstand voltage includes the following steps:
[0031] The first stage:
[0032] (1) Prepare six 600mm long cables as insulation samples;
[0033] (2) Among them, 3 insulated sample cables are subjected to aging treatment (aging conditions are selected according to different materials in each standard), and the other 3 insulated sample cables are kept in normal state;
[0034] (3) Cool the insulating sample to room temperature (at least 24 hours) after aging treatment;
[0035] (4) Wrap the 300mm middle part of the 6 insulating sample cables with aluminum foil and wrap them on a test rod with twice the outer diameter (twice the outer diameter of the insulating sample cable);
[0036] (5) According to the insulated sample cable, apply the corresponding withstand voltage value between the conductors of the 6 insulated sample cables and the test rod ...
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The invention discloses a test method for simulating dielectric strength attenuation and withstand voltage of a long-term operation cable, and the whole test is divided into two stages: the first stage: simulating the change rate of dielectric strength of a high polymer material after long-term operation and before operation, and carrying out the second stage of test after the requirement is met;a second stage: simulating a withstand voltage test that the line works at a rated temperature after long-term operation and works at the rated temperature in the early stage; in the first-stage destructive test, the change rate of dielectric strength after aging and before aging is verified, so that the stability of the material in the aspect of dielectric strength is effectively verified, and itis guaranteed that the difference between the performance of a subsequent terminal in use and the performance in the early stage is too large; on the basis of the first stage, the second stage withstand voltage test is carried out under the rated temperature and the minimum bending radius, and whether the cable can bear the rated voltage for a long time at the rated maximum temperature or not isverified.
Description
technical field [0001] The invention relates to a test method for simulating the attenuation of dielectric strength and withstand voltage of long-term running cables, which is used to control the problems in the electrical properties of polymer materials during subsequent use. Background technique [0002] With the development of the wire and cable industry, many upstream industries - polymer materials companies have emerged. The number is large, but the quality is uneven. As a cable manufacturer, the control methods are limited, resulting in related problems that do not exist in the standard for the end-user products. , Cable manufacturers have nothing to do in the middle. The technical root cause is that the test method for cables is not perfect enough. [0003] For example, the cable withstand voltage test is to assess whether the insulating polymer material can withstand a high enough field strength to ensure the safe and effective operation of the cable in the normal w...
Claims
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IPC IPC(8): G01R31/12G01R31/20
CPCG01R31/1272G01R31/20
Inventor 王卫星张锐孙建宇刘建锋闫俊桥刘戈凌晓初
Owner JIANGSU ZHONGLI GRP CO LTD