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Pouring technology for dry-type transformer coils

A dry-type transformer and coil technology, which is applied in the field of transformer manufacturing, can solve the problems of resin machinery, coil partial discharge, unqualified power frequency withstand voltage test index, and many air gaps, so as to achieve the effect of improving technical indicators

Active Publication Date: 2016-02-10
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, due to the insufficient process of most manufacturers, the quality after casting is unstable, and there are often deficiencies such as more air gaps, resin machinery, poor insulation performance, and difficulty in demoulding, resulting in partial discharge of coils after casting, power frequency withstand voltage, etc. Unqualified test indicators and process defects

Method used

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  • Pouring technology for dry-type transformer coils
  • Pouring technology for dry-type transformer coils
  • Pouring technology for dry-type transformer coils

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0061] The process conditions of Examples 1-4 are shown in Table 1.

[0062] Table 1

[0063]

[0064]

[0065] In the table: the results of partial discharge level and power frequency withstand voltage breakdown rate are obtained in accordance with "National Standard of the People's Republic of China: Partial Discharge Measurement (GB / T7354-2003 / IEC60270·2000)".

[0066] It can be seen that the drying process 110, the degassing process 210 / 220, the mixing process 320, and the demolding process 620 can achieve better results than the corresponding other processes.

[0067] In addition, as the control accuracy level increases from F1 to F3, the average partial discharge level and average power frequency withstand voltage breakdown rate have decreased. However, as the requirements for equipment and control will also increase, the cost and operation difficulty will increase. Therefore, under the premise of meeting the requirements, the control level F1 or F2 can usually be adopted.

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Abstract

A pouring technology for dry-type transformer coils is disclosed. The pouring technology comprises the working procedures of drying, degassing, mixing materials, pouring, curing and de-molding. The pouring method can be widely applied to resin pouring type coils of various capacities and structural forms, and has a low equipment demand. The coils processed by the technology have the advantages of less coil air gaps, high epoxy toughness and high de-molding efficiency; the magnitude of partial discharge of the coils is far below the magnitude of partial discharge of the national standard; and breakdown rate in a power-frequency voltage-withstand test is low than 0.1%

Description

Technical field [0001] The invention relates to the field of transformer manufacturing, in particular to a pouring process of a dry-type transformer coil. Background technique [0002] Because of its safe and stable operation, no pollution, low noise, and maintenance-free advantages, resin-cast dry-type transformers have been widely used in various electric places. However, most manufacturers currently suffer from inadequate processes and unstable quality after pouring. They often have problems such as large air gaps, resin machinery, poor insulation performance, and difficulty in demolding, resulting in partial discharge of coils after pouring, power frequency withstand voltage, etc. Unqualified test indicators and process defects. Summary of the invention [0003] In order to solve the above problems, especially to improve the quality of the resin casting process, solve the defects of high partial discharge and unqualified power frequency withstand voltage test, the present inv...

Claims

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Application Information

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IPC IPC(8): H01F41/04B29C39/10B29C39/22B29C35/02B29B13/00
Inventor 丁琳张延峰孙绪凯李成章黄可辛乔力
Owner STATE GRID CORP OF CHINA
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