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Insulation method for preventing metal screw or bolt from generating magnetic flux leakage linkage circulation

A screw and bolt technology, which is applied in the field of insulation of metal connectors, can solve the problems of safe and reliable operation of power transmission and transformation circuits, unstable operation of oil chromatography, and large circulation.

Active Publication Date: 2009-10-07
CHINA XD ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The more loops of the leakage flux chain, the greater the circulating current will be, which will lead to local overheating of the metal structural parts in the surrounding range of the screw or bolt, and then there will be abnormal oil chromatography and operation failure, which will affect the safety and reliability of the power transmission and transformation circuit. Operation brings instability

Method used

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  • Insulation method for preventing metal screw or bolt from generating magnetic flux leakage linkage circulation
  • Insulation method for preventing metal screw or bolt from generating magnetic flux leakage linkage circulation
  • Insulation method for preventing metal screw or bolt from generating magnetic flux leakage linkage circulation

Examples

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Effect test

Embodiment 1

[0018] Such as figure 1 , figure 2 As shown in the figure, wrap non-woven glass filaments in the middle of the metal screw with a thickness of about 1 to 4 mm, and then infiltrate with thermosetting insulating resin (such as epoxy resin) to form an insulating layer 3. The specific thickness should be the same as the size of the flange hole of the metal structure II To cooperate, it is necessary to ensure that the insulating part of the screw can extend into the flange hole, and at the same time leave a certain gap, so the outer diameter of the screw after insulation must be strictly controlled. The specified thickness makes its surface smooth. The end part 2 is screwed into the blind hole of the flange of the structural part I, and the insulating layer 3 is extended into the flange hole of the structural part II to isolate the structural part I, the structural part II from the middle section of the screw; the end part 4 passes through the gasket and the insulating layer. Th...

Embodiment 2

[0020] Such as image 3 , Figure 4 As shown, the middle of the metal screw can also be processed into a thin waist in advance. 1. Wrap non-weft glass filaments in the middle of the screw, with a thickness of about 1-4 mm. The specific method and requirements for insulating are the same as in Example 1. The end 2 is screwed into the structural member In the flange blind hole of I, the insulating layer 3 extends into the flange hole of the structural part II, and isolates the structural part I, the structural part II from the thin waist part 1 in the middle of the screw; the end part 4 passes through the gasket and the insulating washer 5, the spring The washer is connected to the nut; the insulating layer 3 of the screw must extend into the insulating washer 5.

Embodiment 3

[0022] When metal bolts are used for connection, the middle of the bolt has a thin waist or no thin waist, such as Figure 5 , Image 6 As shown, there is no thin waist in the middle of the bolt, and there is no weft glass filament winding in the middle, with a thickness of about 1-4 mm. The specific method and requirements of the insulation are the same as in Example 1. Pass the insulating layer 3 through the flange holes of the structural parts II and I, and the end 2 connects the nuts through the washers and spring washers; the insulating layer 3 extending into the flange holes of the structural parts I and II connects the structural parts I, II and The insulating layer 3 in the middle of the bolt is isolated for one section; the bolt is fastened after the end part 4 is combined with the washer and the insulating washer; the insulating layer 3 of the bolt must extend into the insulating washer 5 .

[0023] The metal screw or bolt insulation method of the present invention ...

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Abstract

The invention discloses an insulation method for preventing a metal screw or a bolt from generating magnetic flux leakage linkage circulation; the insulation method is characterized by comprising the following steps of wrapping the middle of the screw or the bolt by weft-free glass filaments with thickness of 1-4mm, using thermosetting insulation resin for infiltrating the glass filaments to form an insulation layer, and processing the surface after the insulation layer is solidified so as to lead the surface to be smooth and lead the outer diameter size of the screw or the bolt insulated by wrapping to be capable of extending into the hole of a structure part flange; and the insulation layer separates the structure part from one section of the middle part of the screw.

Description

technical field [0001] The invention relates to an insulation method for metal connectors, in particular to an insulation method used in power transformers and reactors to prevent metal screws or bolts from generating circulating current due to leakage flux chains in high leakage magnetic field areas. Background technique [0002] With the increasing demand for large-capacity and long-distance power transmission in my country, the development of power grids has experienced a history of development from medium-voltage power grids, high-voltage power grids, ultra-high voltage power grids, and UHV power grids. For electrical equipment, connecting two different metal structural parts with metal screws or bolts is a common fastening method. However, for large-capacity UHV power transformers and reactor products, when two different metal structural parts in the high leakage magnetic field area are connected by metal screws or bolts, due to the leakage flux linkage, there will be a...

Claims

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Application Information

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IPC IPC(8): H01F27/32H01F27/34H01F41/00
Inventor 宓传龙汪德华陈荣巨玲
Owner CHINA XD ELECTRIC CO LTD
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