![]() ![]() Min Power Frequency withstand Voltage Wet (1 min) This complies with IEC 62223 or an equivalent. It is subjected to cantilever, tensile and compressive loads. These insulators consist of a load-bearing solid core, housing and end fittings attached to the insulating core. The Line Post insulators give rigid support to a live part which is to be insulated from earth or another live part. ![]() The ultimate mechanical strength of the pin insulator assembly will be equal to the above cantilever strength. Pilot pins shall have a minimum failing load of 0.7 kN. Line pins shall have a minimum failing load of 10 kN. Min Power Frequency Flashover Voltage WetĮach insulator is supplied complete with a hot dip galvanized forged steel pin, complete with nut, lock nut and spring washer complying to BS 3288 Pt 2 large steel. In addition, the following minimum characteristics apply: Characteristics The insulators have necks suitable for fastening conductors with tie wire or preformed fittings. Pin type insulators are screwed onto a bolt. Pin insulators are supplied to IEC 62223 or equivalent Pin insulators are used at specific points, i.e. Each type of insulator also has different functions for different operating conditions.Īccording to the function: There are more than 5 types, Pin Insulator, Suspension Insulator, Strain Insulator, Spool insulator, Stay Insulator, and so on. The basic functions of insulators are insulating, supporting and fixing conductor. Silicone rubber insulator is easy to install, excellent pollution performance, excellent mechanical properties, resistant to weathering, resistant to vandalism, resistance to damage and so on. Porcelain is heavy than other materials and hard to transport and install, but it is cheap and has a long-life performance. Interchangeability- can easily replace existing porcelain insulatorsĮach material has its advantages and disadvantages, so the insulator material selection depends on its characters and the requirement of customers. Small volume and lightweight, easy to install and transportīetter performance in high contamination areasĬonsistent mechanical and electrical performance throughout the entire service life (c) Composite insulatorĬomposite polymer insulators have two insulating parts such as fiberglass core and a metal equipped with metal end fittings. High compressive strength than porcelain insulators.Īs it is transparent, so any flow impurities air bubbles cracks, impurities, etc. High dielectric strength about 140KV per c.m of the thickness of the material. Glass insulator has the following advantage:. Many times glass is used as insulating material. Suitable for extremely hot/cold changes in the environment (b) glass insulator Resistant to rodents, termites, birds and other animals capable of compromising the integrity Higher resistance to degradation of the surface In the dry state as electric insulation material has better electrical properties than the polymer Giving a longer useful life in terms of loads generated by electric charges At its disposal, the porcelain insulator is not dangerous waste It is mechanically stronger than glass, gives less trouble from leakage, and is less affected by temperature change.Įnvironmental friendly. The metal parts within the insulator are made of malleable cast iron with galvanizing. It is produced by firing at a high temperature a mixture of kaolin, feldspar, and quartz. The most commonly used materials for the overhead line is porcelain. high ratio of puncture strength to flashoverĬhapter 2:Insulator material (a) Porcelain insulator.high relative permittivity of insulating material so that the dielectric strength is high.high electrical resistance in order to minimize the leakage currents.high mechanical strength to withstand the conductor load, wind load, etc.Insulators should have the following properties: Overhead power lines are always supported on insulators mounted on their support poles and towers. Permittivity and dielectric strength of the insulating material are very high so that it can withstand high electrical stress. ![]() Insulators are used to separate line conductors from each other and the supporting structures electrically. Chapter 7: Frequently Asked Questions (FAQs)Ĭhapter 1:What is an electrical insulator?.Chapter 5: The important manufacturing Process in Rax Industry.Chapter 1 : what is an electrical insulator?. ![]()
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