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Apparatus for triggering the electric tree of an epoxy resin insulating material by using variable pulse voltage

A pulse voltage, epoxy resin technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve problems such as breakdown, electrical equipment operation threat, uneven distribution of epoxy resin electric field, etc.

Inactive Publication Date: 2017-08-18
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the production and installation of insulators, various defects such as air gaps, micropores, and impurities may be introduced, resulting in uneven distribution of the electric field inside the epoxy resin, making the electric field strength in the weak insulation area too high, causing partial discharge and charge injection, which in turn leads to The formation of electrical tree branches causes insulation aging or even breakdown, posing a threat to the operation of electrical equipment

Method used

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  • Apparatus for triggering the electric tree of an epoxy resin insulating material by using variable pulse voltage
  • Apparatus for triggering the electric tree of an epoxy resin insulating material by using variable pulse voltage
  • Apparatus for triggering the electric tree of an epoxy resin insulating material by using variable pulse voltage

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Embodiment

[0034] 1. Preparation of epoxy resin insulation samples.

[0035] The samples used were prepared from high activity and low viscosity liquid epoxy resin (bisphenol A, HY-511 type) and curing agent polyamide resin (HY-651 type) produced by Tianjin Yanhai Chemical Co., Ltd. First, take an appropriate amount of epoxy resin and curing agent and pour it into a beaker at a ratio of 3:1 to mix, and stir the mixture at a constant speed with a magnetic stirrer for 20 minutes to make the liquid evenly mixed; then, vacuum the mixed liquid in a vacuum box for 2 hours , to remove internal air and moisture; after the above process is completed, the uncured epoxy liquid is poured into a custom-made mold. In order to simulate the actual defects inside the epoxy sleeve, metal silver needles are inserted into the mold in advance to form a pin-plate Electrode structure, before using the needle electrode, put it under a digital magnifying glass for magnification inspection, remove the needle elec...

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Abstract

The invention relates to an apparatus for triggering the electric tree of an epoxy resin insulating material by using variable pulse voltage. The apparatus comprises an electric tree experimental platform and a high-voltage pulse power supply assembly. The electric tree experimental platform comprises a thermotank, a liquid nitrogen tank and an objective table. The liquid nitrogen tank communicates with the inside of the thermotank through a pipeline. A test sample is fixed to the objective table. One end of the high-voltage pulse power supply assembly is grounded and the other end of the high-voltage pulse power supply assembly passes through the top of the thermotank to be inserted into the test sample. A grounded aluminum foil is arranged between the test sample and the objective table. Compared with the prior art, the apparatus in accurate in data acquisition and beneficial to insulation reliability evaluation.

Description

technical field [0001] The invention relates to the technical field of polymer insulation, in particular to a device for inducing electric branches of epoxy resin insulation materials with variable pulse voltage. Background technique [0002] The forms of polymer insulation aging mainly include electrical, thermal, chemical, humidity, mechanical aging and other aging forms, and the electrical aging caused by electric tree branches is an important reason for the insulation failure of insulating accessories, and it is also the main reason for the use of high-voltage equipment and accessories. A common form of aging that precedes dielectric breakdown. Once the electric tree in the polymer is initiated, it may extend to the ground electrode at an extremely fast speed, and the reliable operation of high-voltage equipment will be seriously threatened. Factors such as impurities, air gaps, protrusions, and space charge accumulation inside the polymer caused by long-term high volta...

Claims

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Application Information

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IPC IPC(8): G01R31/12G01R31/16
CPCG01R31/1263G01R31/16
Inventor 李红雷姚周飞俞瑾华杜伯学李忠磊杨卓然姜金鹏
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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