Composite Hollow Insulator

Description

Product Overview

Composite Hollow Insulator is composed of main parts including epoxy fiberglass reinforced twine pipe, silicon-rubber add sheds increasing creepage distance and connecting flange. Epoxy fiberglass reinforced twine pipe, which is the insulating inner part of composite hollow insulator, is processed by special winding machine using epoxy resin presoaked uninterrupted non-alkali fiberglass according to mechanical laydown design and has excellent mechanical strength and dielectric property. As the external insulation of composite hollow insulator, silicon rubber add sheds increasing creepage distance takes on necessary electric functions, such as protecting and providing creepage distance. Connecting flange, which is made of aluminum through compression casting, adopts unique adhesive technology to transfer mechanical load and provide sealing for supporting and connecting structures. Composite Hollow Insulator is suitable for power system between 40.5 kv-550 kv. For example, high voltage electric products like SF₆ transformer, SF₆ line breaker bushing, arrester, high voltage bushing, subsection capacitor, cable terminal, etc.

Main Characteristics

a、  Lightweight：reducing breakage danger in transportation and installation, relieving labor intensity.

b、  Antifouling property: Even under heavy pollution, it still has supreme electric property, and no additive surface coating is needed.

c、  Excellent anti-aging property: In the process influenced by weather and electric, it keeps stable dewatering property. Due to mobility of dewatering property of silicone rubber, no sweeping is needed upon the insulator.

d、  Supreme Anti-UV Ability. 

e、  Explosion proof property: Even under condition of interior over-pressure, people and equipment are quite safe.

Property Index of Fiberglass Reinforced Twine Pipe:

Physical characteristics

No.	Index name	Unit	Index
1	Fiber content	w-%	70-75
2	Density	g/ cm3	2.00
3	Water absorption	%	0.02
4	Axial thermal expansion coefficient	1/K	9.2E-06
5	Heat diffusivity	w/mK	0.3-0.4
6	Glass Transition Temperature	℃	110-120

Mechanical property

No.	Index name	Unit	Index
1	Tensile elastic ratio, axial	MPa	27000
2	Tensile strength, axial	MPa	230
3	Tensile strength, circumferential	MPa	145
4	Compressive strength, axial	MPa	180
5	Buckling strength, axial	MPa	210
6	Shearing strength	MPa	155

     Electric property

No.	Index name	Unit	Index
1	Pulse dielectric strength, axial	Kv/mm	10-12
2	Dielectric strength, axial 50 Hz, 12.7mm ring section	Kv/mm	3-6
3	Dielectric strength, radial 50 Hz, 3mm	Kv/mm	10-12
4	Relative dielectric strength		4.5-5.5

Main property indexes of silicone rubber

Electric property

No.	Index name	Unit	Index
1	Volume resistivity	Ω.m	≮1X1012
2	Breakdown strength	Kv/mm	≮20
3	Loss tangent tgδ	%	≯3
4	Relative dielectric coefficient		≮3.5

Mechanical property

No.	Index name	Unit	Index
1	Tearing resistance strength	KN/ m	≮10
2	Mechanical breaking strength	MPa	≮3
3	Tensile failure extensibility	%	≮100
4	Hardness	Shore	50