Casing pipe insulation air gap defect simulation device and manufacturing method thereof
A technology for air gap defects and simulating devices, applied in the direction of testing dielectric strength, etc., can solve problems such as short circuit, damage, local insulation deterioration and insulation, etc.
Active Publication Date: 2016-05-25
GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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Problems solved by technology
Most insulated main transformers use oil-paper capacitor bushings, and the air gap defect between the oil-paper insulation layers is the most common defect
These power failure pre-test items can only reflect the overall insulation of the bushing, and cannot reflect the local insulation defects of the cable well, such as partial discharge defects inside the bushing. These partial discharge defects will also gradually deteriorate the local insulation and eventually cause insulation. short circuit
Method used
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[0023] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.
[0024] It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes ...
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The invention relates to a casing pipe insulation air gap defect simulation device. The device comprises a capacitor core and a porcelain sleeve. The capacitor core comprises a conducting rod, capacitive screens and insulating layers. Multiple layers of the insulating layers and multiple layer of capacitive screens are successively and alternatively winded on the conducting rod to form the capacitor core. The multiple layer of capacitive screens comprise an end screen arranged on an outermost layer. An internal portion of the insulating layer which is close to the end screen is provided with a hole. An internal portion of the hole is provided with a high temperature resistance insulating tube. A gas is filled in the high temperature resistance insulating tube to form an air gap. The porcelain sleeve is coaxially arranged on a periphery of the capacitor core. Insulating oil is filled in the casing pipe insulation air gap defect simulation device. The internal portion of the hole of the casing pipe insulation air gap defect simulation device is provided with the high temperature resistance insulating tube with the air gap so as to simulate an air gap defect. The insulating layer whose internal portion is provided with the hole is close to the end screen so that an air gap defect partial discharge signal can be well spread. A real condition of air gap defect discharge can be well simulated. The device can be used for detection and diagnosis identification research of a partial discharge characteristic of the air gap defect among the insulating layers.
Description
technical field [0001] The invention relates to the technical field of bushings, in particular to a bushing insulating air gap defect simulation device and a preparation method thereof. Background technique [0002] With the development of social economy, the number of substations is increasing, and high-voltage bushings, as a necessary part of the main transformer, have a huge demand. The insulation performance of high-voltage bushings is an important performance characteristic, and factors such as rough manufacturing technology, poor production technology, and insulation aging and deterioration will cause insulation defects and affect insulation performance. The deterioration of the bushing insulation defect will cause short circuit, explosion and other phenomena, which will cause the main transformer to trip and cause the main transformer protection action. Therefore, it is very necessary to evaluate, analyze and diagnose the insulation state of the high voltage bushing. ...
Claims
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IPC IPC(8): G01R31/12
Inventor 李光茂杜钢王剑韬老洪干刘建成杨森敖昌民
Owner GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD