• 57 -21 Post Ceramic Insulators (ANSI)
  • 57 -21 Post Ceramic Insulators (ANSI)

57 -21 Post Ceramic Insulators (ANSI)

Application: High-voltage
Material: Porcelain
Structure: Strain Insulator
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57 -21 Post Ceramic Insulators (ANSI) pictures & photos
57 -21 Post Ceramic Insulators (ANSI)
US $2-22 / Piece
Min. Order: 10 Pieces
Diamond Member Since 2011

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Basic Info.

Model NO.
57 series
Type
B Type Insulator
Connection Method
Trough Type
Size of Bearing Capacity
550KN
Certification
ISO9001
Color
Brown
Brand
Haivol
Porcelain Insulators
Strain Insulator
Transport Package
Wooden Case
Specification
ANSI, IEEE, IEC
Trademark
HAIVOL
Origin
China
HS Code
8546209090
Production Capacity
20, 000PCS /Month

Product Description

Porcelain insulators,also named ceramic Insulators are made from clay, quartz or alumina and feldspar, and are covered with a smooth glaze to shed water. Insulators made from porcelain rich in alumina are used where high mechanical strength is a criterion. Porcelain has a dielectric strength of about 4-10 kV/mm.It also has perfect dielectric performance.Porcelain insulators are widely used in overhead transmission lines to provide mechanical support and electrical protection, as well as in distribution lines and substations. Depending on voltage considerations, different kinds of insulators are used in power systems,we have Pin insulator,strain insulator,suspension insulator.post insulator,long rod insulator,horizontal post insulator,Railway insulator,shackle insulator,stay insulator.
Insulators are a special insulation control that can play an important role in overhead transmission lines. In the early years, insulators were mostly used for telegraph poles. Slowly, a lot of disk-shaped insulators were hung on one end of the high-voltage wire connection tower. It was used to increase the creepage distance. It was usually made of glass or ceramics and was called an insulator. Insulators should not fail due to various electromechanical stresses caused by changes in the environment and electrical load conditions, otherwise the insulators will not have a significant effect and will damage the use and operating life of the entire line.

 

The main function of insulators is to achieve electrical insulation and mechanical fixation, for which various electrical and mechanical performance requirements are specified. If under the specified operating voltage, lightning overvoltage and internal overvoltage, no breakdown or flashover along the surface; under the specified long-term and short-term mechanical load, no damage and damage; under the specified machine , After long-term operation under electrical load and various environmental conditions, no obvious deterioration will occur; the fittings of insulators will not produce obvious corona discharge under the operating voltage, so as not to interfere with radio or television reception. Because insulators are widely used devices, their connection fittings are also required to be interchangeable. In addition, the technical standards of insulators also require various electrical, mechanical, physical, and environmental conditions to test the performance and quality of the insulators according to different types and conditions of use.

Specifications
57 -21 Post Ceramic Insulators(ANSI) 
1.Standards:ANSI 57series 
2.Certificates:ISO9001:2008 
3.best price and short delively 

 57 -21 Post Ceramic Insulators(ANSI)
1)Material: Porcelain 
2)ANSI class: 57-21, 57-22, 57-23, 57-24, 57-25, 57-11, 57-12, 57-13, 57-14, 57-15
•Specifications:
Cat/NO A1034 A1035 A1036 A1037 A1038 A1039 A1040 A1041 A1042 A1043
ClassANSI 57-21 57-22 57-23 57-24 57-25 57-11 57-12 57-13 57-14 57-15
Creepage distance (mm) 356 559 737 1015 1145 356 559 737 1015 1145
Dry arcing distance(mm) 165 241 311 368 438 165 241 311 368 438
Cantilever strength(kn) 12.5 12.5 12.5 12.5 12.5 12.5 171 12.5 12.5 12.5
Low-frequency dry flashover (kv) 80 110 125 150 175 80 110 125 150 175
Low frequency wet  flashover(kv) 70 100 115 135 160 60 85 100 125 150
Critical impulse flashover ,Pos(kv) 130 180 210 255 290 130 180 210 225 290
Critical impulse flashover ,Neg(kv) 155 205 260 340 380 155 205 260 340 380
Test voltage to ground(kv) 15 22 30 44 44 15 22 30 44 44
Maximum RIV at 1000KHz(uV)1000KHZ 100 100 200 200 200 100 100 200  
200
 
200
Net weight ,approx.(kg) 7.5 10.5 12.7 16.8 19.5 6.8 10 11.8  
15.9
 
18.6
Number in standard package 6 .3 3 2 2 6 3 3  
2
 
2

57 -21 Post Ceramic Insulators (ANSI) 57 -21 Post Ceramic Insulators (ANSI) 57 -21 Post Ceramic Insulators (ANSI) 57 -21 Post Ceramic Insulators (ANSI) 57 -21 Post Ceramic Insulators (ANSI) 57 -21 Post Ceramic Insulators (ANSI) 57 -21 Post Ceramic Insulators (ANSI)
57 -21 Post Ceramic Insulators (ANSI)
57 -21 Post Ceramic Insulators (ANSI)

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From payment to delivery, we protect your trading.
57 -21 Post Ceramic Insulators (ANSI) pictures & photos
57 -21 Post Ceramic Insulators (ANSI)
US $2-22 / Piece
Min. Order: 10 Pieces
Diamond Member Since 2011

Suppliers with verified business licenses

Manufacturer/Factory & Trading Company
Number of Employees
50
Year of Establishment
2010-05-26