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These insulators protect the materials from electricity and heat. Some materials do not allow electricity to pass through them. These materials are known as electrical insulators.. The main disadvantage are: In principle, the raw materials that are required for making inorganic insulation materials are present in nature. It should have high resistance to temperature. Thus the insulator plays an important part in the successful operation of the lines. Slow-curing liquid foams are also available. Thus the insulator plays an important part in the successful operation of the lines. In this article, we will learn about different types of insulators used in power system transmission and distribution line, like Pin, Suspension, Strain type insulator and operating voltages, with diagram uses and advantages. Suspension Insulators. The porcelain is manufactured from china clay which in nature in the form of aluminum silicate. This is the commonest form of insulation. Porcelain is the most common materials is used for insulator, but glass , steatite and special composition materials are also used. Types of Insulators There are several types of insulators but the most commonly used are pin type, suspension type, strain insulator and shackle insulator. Thus, this is all about different types of insulators. Pin Insulator. The main function of an insulator is to … When the tension in lines is exceedingly high, as at long river spans, two or more strings are used in parallel. The cost of the suspension type insulators is very less as the voltage rating is high. The other types of insulators include the following. These insulators are small in size, used in overhead distribution systems. In flash over, an arc occurs between the line conductor and insulator pin (i.e. It is mixed with plastic Kaolin, feslpar and quartz and mixture is heated in a kiln at a controlled temperature. This type of insulation consists of a loose, lightweight, material, such as cork granules, cellulose fibre, mineral wool or even recycled newspaper. If any one of the insulator in the string fails, it can be replaced easily and at a lesser cost. Hence the transmission voltage is more than 50 kV, the suspension type insulators are preferred. However, for high voltage transmission lines, strain insulator consists of an assembly of suspension insulators as shown in Fig. Various types of insulators used for overhead transmission and distribution lines are described below: Type # 1. Strain type insulators are used when the line is subjected to greater tension such as dead ends, river crossings, sharp curves and when there is a change in the direction of line. iii)Into the coarse threaded porcelain, the insulator is screwed the steel bolt with a lead head. Insulation usually comes in batts, rolls or loose in bags and some types are more difficult to fit than others. There are several types of insulators but the most commonly used are pin type, strain insulator, shackle insulator and suspension type. This is the most recent type of construction and it permits the disc to be formed out of quite thick porcelain thereby allowing the disc to be of one piece only. Once breakdown voltage is applied to insulator then it will become conductive so this is known as insulation breakdown. The above types of insulators are commonly used in overhead power lines. It is widely used in insulation and mechanical fixing of high-voltage overhead transmission lines and soft busbars of power stations and substations. Such insulators are used for electric power transmission and distribution at … As the line voltage increase, the pin insulators to be used become heavy and complicated in construction also its cost increase. Suspension Types insulators are also called as string insulator or disc insulators. High dielectric strength about 140 KV per c.m of the thickness of the material. Designed to provide excellent thermal insulation for pitched roofs at ceiling level, it’s usually put down in two layers - the first layer between the joists and the second at right angles on top of them. Blanket insulation (also called matting insulation) This is generally the easiest to install and is commonly used as roof insulation. The galvanized steel bolt is joined at the bottom by cementing. Loft insulation types. Insulator are required to withstand both mechanical and electrical stresses. These valence, or free, electrons vary between substances, causing them to exhibit varied electrical properties. The successful operation of an overhead line depends to a considerable extent upon the proper selection of insulation. In order to relieve the line of excessive tension , strain insulator are used. Below, we’ll break down what types are available and what their main properties are. Thus, there are two types of post insulators: (i) Station post insulators and (ii) Line post insulators. The voltage capacity of this insulator is 33 kV and works in the positions of bend or circular turn. Strain Insulator. Insulators are also required where the wire enters buildings or electrical devices, such as transformers or circuit breakers, to insulate the wire from the case. What is Cable Insulators: An insulator is one kind of material that prevents the flow of electric current and can be used to support the electrical conductor. The electrical breakdown of the insulator can occur either flash-over or puncture. Some less common types include Icynene foam and Tripolymer foam. Of the two types of solid wall insulation, inner wall is the cheaper to install, but there are some compromises. The insulator materials produced by ZMS are usually made of high-quality porcelain or composite. -1, No. The disc insulators provide a cost-effective solution for medium & low polluted environments and these are designed with high-grade raw materials. Fiberglass Insulation. The voltage capacity of the strain insulator is 33kV. Materials of Insulator should be non-porous, free from impurities and cracks. 2) Shackle insulators. I NTERNATIONAL J OURNAL OF I NNOVATIVE E NGINEERING, T ECHNOLOG Y AND S CIENCE ISSN: 2533- 7365 Vol. 5. Your email address will not be published. What are the types of insulators are used in overhead transmission lines? Types of Insulators Cours. On the downside: you need much energy in order for the material to melt. The voltage capacity of this insulator is 11kV. If by any accident the porcelain breaks, the line conductors do not fall. There are many kinds of insulators however the foremost unremarkably used ar pin sort, suspension type, strain nonconductor, and shackle nonconductor. Plastic, wood, glass and rubber are good electrical insulators. Pin type is used for transmission and distribution of electric power at the voltage up to 50 KV. It is composed of mineral fibers, either processed fiberglass or rock wool, and comes in blanketed rolls of different widths. Insulators. Reel insulators are used in overhead service mains, it is made up of porcelain material and the diameter of the reel insulator is 12.5 mm.The function of reel insulators is to maintain distance between cables which are used in service mains. The glass is made tough by annealing. 1. Moreover, they are fireproof and sustainable. which are manufacture for different voltage ratings. What is the Difference between 8051, PIC, AVR and ARM? Share to Twitter Share to Facebook Share to Pinterest. Air, cloth and rubber are good electrical. Types of Insulators. At present, these insulators are used as strain insulators but they are used in less voltage distribution lines. Types of insulators. Types of Insulators Types of Insulators are as follows: 1) Pin insulators. These are used in transformers because, in electrical systems, these are the most important parts. It is connected by using the steel tower so it needs more height to support all the discs. Please refer to this link to know more: What is Disc Insulator: Types & Its Applications. i)Hewiett suspension type. In addition to that there are other two types of electrical insulator available mainly for low voltage application, e.i. What is the function of an insulator? Organic molecules are mostly insulators because they're held together by covalent (shared electron) bonds and because hydrogen bonding helps stabilize many molecules. These foams are designed to flow over obstructions before expanding and curing, and they are … This also called disc insulator and the designing of these insulators can be done using materials like porcelain or glass. Insulator materials must be free from cracks, impurities and nonporous. For low voltage lines, the stays are to be insulated from the ground at a height not less than 13 meters from the ground. As the pin insulators cannot be used if the voltage is more than 50kV. Blanket insulation is the type of insulation most of us are familiar with. Minimum leakage current to earth to keep radio interference and corona loss within an acceptable limit. 4. This page is intended to be transcluded into other articles, therefore please try to keep the changes "context neutral" as they will appear in several places within the wiki. Insulating supports called insulators are required at the points where they are supported by utility poles or transmission towers. In practice, sufficient thickness of porcelain is provided in the insulator to avoid puncture strength to flash-over voltage is known as the safety factor. The central top portion of the insulator consists of two curved tunnels, the planes of which are at right angles to each other. It is used as a protective shield as it provides protection against noise, lightning, and heat. Many time glass is used as insulating material. 3. 1. 5. Glass insulators started being used in the 18th century for telegraph and telephone lines, which were then, replaced by ceramic and porcelain types in the 19th century. The article provides basic working and physical construction of different types of insulators used on electrical power systems. Types of Insulators . These materials are known as electrical insulators.. Another way to determine what type of insulation you have in your home is to look at the insulation itself. Inorganic insulation. Because of how it is made, by effectively weaving fine… stay insulator and shackle insulator. 5) Post insulators. shows, a shackle insulator fixed to the pole. Some more types of insulators are as follows. Types of Electrical Insulation In Overhead Lines. The fixing of pin insulator is shown in the figure. These insulators are used for above 33kv in terminal & section towers for high voltage lines. During rain, the rain sheds are made in the order that these rain sheds should not disturb the voltage distribution they are so designed that their surface at right angles to the electrostatic lines of force on. How to connect DC battery charger in industrial, Why we use 3 phase power supply, not 4/5/6 phase, Difference between 50Hz and 60Hz frequency, Types of Generator available in electrical field, how to calculate cable size for electrical works, How to calculate KVAR for capacitor bank design, How to calculate short circuit current for transformer. Types of insulators in overhead Lines. 1. Both types expand and harden as the mixture cures. Pin Type Insulator. In the figure, the pin type insulator is shown. To overcome this, toughened glass types were introduced, which became popular due to their longer lifespan. Your email address will not be published. When the insulator are wet their outer surface is almost conducting so their flashover distance is = (b+c+d) . The downside of Kingspan K5 is that it’s a lot more expensive than alternatives like EPS. 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List of insulation materials. In early days, the shackle insulators were used as strain insulator. The pin types of insulators are mostly used in the distribution system. 4 Shackle Insulators. The special materials used in the electrical system are glass, ceramic, PVC, steatite, polymer, etc. Electrical protective insulation is effective in protection from electrical shocks The overhead line conductors are supported on the poles/ turns with the help of insulator to prevent the flow of current to earth. Open-cell foam cells are not as dense and are filled with air, which gives the insulation a spongy texture. It has relatively higher number of petticoats and rain sheds. As the pin insulators cannot be used if the voltage is more than 50kV. 3. How Alternator is working? Note to Editors. Electrical insulators can withstand the charges from electricity. These are connected in vertical as well as horizontal positions. At the top of the insulator is cemented a galvanized cast iron cap. As the conductors run below the earthed cross-arm of the tower, therefore, this arrangement provides partial protection from lightning. The designing of an insulator can be done using different materials like rubber, wood, plastic, mica, etc. It is normally fitted between wood frames and rafters to insulate below the floors in homes, above the ceilings and within the walls. Pin Insulators: This type was amongst the earliest designs, and used for support­ing line conductors. The insulator used in the stay wire is called as the stay insulator and is usually of porcelain and is so designed that in a case of breakage of the insulator the guywire will not fall to the ground. There are 5 types of insulators used in transmission lines as overhead insulation: Pin Insulator. The voltage capacity of suspension insulator ranges from 11 kV to 765 kV. Such insulator can be used either in a horizontal position or in a vertical position. Lead covered steel U links are passed through these tunnels and is bolted to the two similar units at top and bottom as shown in fig. Types of Conductors & Insulators By Larry Rivers ... while substances that inhibit this travel are known as insulators. Stray Insulator. In the case of puncture , the discharge occurs from conductor to pin through the body of the insulator. The common types of insulators are pin type, suspension type, strain insulator and shackle insulators. Shackle Type Insulator. Different types of insulators are shown in fig. As it is transparent, so any flow impurities air bubbles cracks, impurities etc. They are available in either loose fill … The value of safety factor is high so that flashover takes place before the insulator gets punctured. -1 , March – 201 6 The connection of this insulator can be done by using a metallic strip. In this post, we will learn Different Types of Cable Insulators. Tip: You can mix insulation materials and types. The designing of an insulator can be done using different materials like rubber, wood, plastic, mica, etc. Please refer to this link to know more bout what Suspension Insulator is: Construction, Working & Its Types, This is similar to suspension type insulators because it is used in an overhead transmission system but its specifications and working are somewhat different. High insulation resistance to avoid leakage current. These type insulators are used in transmission line when transmission lines take sharp turns. When there is a dead end of the line or there is corner or sharp curve, the line is subjected to greater tension. It has relatively higher number of petticoats and rain sheds. ii) The porcelain insulator has coarse threads but they are lined with a soft material into which the coarse steel pin is screwed. Post Insulator. Those substances that carry electrical current well are known as conductors, while substances that inhibit this travel are known as insulators. • Insulators are used in electrical equipment to support and separate electrical conductors without allowing current through themselves. There are mainly three types of insulator likewise . High ratio of puncture strength of flashover voltage. Different types of insulators are used to prevent the flow of current to the earth from the transmission line. Pin Type Electrical Insulator. These are porcelain rods including weather sheds & metal end fittings at outside. High compressive strength than porcelain insulators. Overall there are 5 types of insulators that are employed on power systems for mechanical support and electrical insulation, the list includes pin, post, suspension, shackle, and strain. In this, the advantages of Hewiiett and cemented cap type insulators have been grouped together. This paper is very easy and is designed for the ultimate beginners who either have started electrical power engineering or for those who are studying Electrical power transmission as one of their subjects. It is arranged in a vertical position and protects transformers, switchgear and other connecting devices. A post insulator is more or less similar to a pin insulator. And glass type insulator has the following advantage:-. Types of Insulators. What is Alternator? Posted by zamanbd at 9:04 PM. These insulators are used in the substations because it is appropriate for different voltage levels. These are available in small size when compared with other types. For low voltage lines ( < 11 KV ), shackle insulators are used as strain insulators. Core and link type insulator: It is a combination of both the above types of suspension insulators. The best examples of insulators are wood, cloth, glass, mica, etc. Strain Insulator. Specification of … You can read more about these overhead line insulators by clicking this link. Space Blanket. Thermal insulation materials have a low thermal conductivity which serves to limit the flow of heat energy between one side of the insulation and the other. It provides the most economic, simple and efficient method of conductor and bus-bar support for voltages up to and including 33 kV. A material or an object that does not easily allow heat, electricity, light, or sound to pass through it. In this type, each insulator disc is symmetrically placed and conforms to electrostatic lines of force. Post Insulators: Post insulator is suitable for higher voltage. IT has high tensile strength as compared to porcelain insulator. Closed cell insulation is formed by bubbles of gas whose thermal conductivity is very low. They can be directly fixed to the pole with a bolt or to the cross arm. Thus, this is all about an overview of disc insulator which includes types, disc insulator working, advantages, disadvantages and it’s applications. Strain Type Insulator. Hewiett suspension type:-. The only disadvantage of this insulator is that the porcelain in between two links is under the greatest electrostatic stress due to which it is liable to puncture. This article discusses an overview of different types of insulators and its working. Various types of materials are used as electrical insulators, the selection being made primarily on the basis of the specific requirements of each application. The insulation of electrical circuits is a necessary requirement for the successful operation of all electrical and electronic apparatus. Sulphur Hexaflouride (SF6) Circuit Breakers. 3 Strain Insulators. The disc of strain insulator is used in the vertical plane. As technology developed insulators were needed for telephone lines, electric power lines, and other applications. The construction of this insulator is simple and needs less maintenance as compared with other types. What are the basic types of insulation? Conductors Materials that possess atoms with freely moving electrons are utilized as conductors in every industry and field requiring electricity. The mechanical stresses on the string decrease since the line suspended are flexible. 4. 3) Disc insulators. In the suspension insulator, it can be divided into disc suspension insulator and rod suspension insulator. Insulation Superstore is proud to offer a wide range of insulation boards, from a variety of well-known brands and industry leaders, such as Celotex insulation board, Ecotherm insulation and Kingspan insulation boards. 3). It’s a rigid pink phenolic board, and has the best thermal performance of any insulation on this list. There are several types of insulators but themost commonly used are :1) Pin Insulator2) Suspension Insulator3) Strain Insulator and4) Shackle insulator. What are insulators. But, now days, they are frequently used for low voltage distribution lines. earth )and the discharge jumps across the air gaps, following shortest distance ( i.e. In the build environment thermal insulation is typically used to reduce the passage of heat between the inside of a building and the outside. It consists of a porcelain disc insulator which is grooved at the bottom in order to increase the flashover distance. 2 Suspension Type. Please refer to this link to know more what a Pin Type Insulator is: Construction, Causes & Applications. Fiberglass is the most common insulation used in modern times. 1). iii)Core and link type of insulators. Types of Insulators are used in an overhead transmission and distribution line to provide insulation to power conductor from ground and tower or supporting structure. What is Cable Insulators: An insulator is one kind of material that prevents the flow of electric current and can be used to support the electrical conductor. What are the examples of an insulator? These hollow insulat… These are low in weight compare with porcelain type while giving better power. When there is a dead end of the line or the line or there is the corner or sharp curve, … The overhead line conductors are supported on the poles/ turns with the help of insulator to prevent the flow of current to earth. Insulators play an important role in the successful operation of the line. Sheet Insulation . Both are typically made with polyurethane. 1. Some materials do not allow electricity to pass through them. But the most common material used in the insulator is porcelain and also special composition, steatite, glass materials are also used. There are several types of insulators but the most commonly used are pin type, suspension type, strain insulator and shackle insulator. Types of domestic insulation include insulation board, roll insulation, batt insulation (also known as insulation slab), multifoil insulation, acoustic insulation, and insulated plasterboard too. Pin Insulator. Today there are over 2000 collectors, and insulator clubs, national shows, and good reference books are available. Some of the more common types are described below. In this insulator, there is no metal part among the units, which assists to raise their strength. The suspension type insulators are generally used with steel towers. Kingspan are producers of Kooltherm K5, another type of insulation we love. Conductors for lower voltages in distribution may have some insulation but are often bare as well. These insulators are most helpful compare with other insulators because; if one disc in the insulator gets damage then remaining all the discs will work properly. They are paper, plastics, rubber, Styrofoam, glass & dry air. The properties of an insulator are mechanical and dielectric strength is high, insulation resistance is high to prevent leakage current. Power line insulators are one of the important components widely used in contact nets. The other important advantage is that it has high puncture strength. This method is generally adopted. This kind of insulator is used in distribution systems. In the transmission lines, it plays an essential role in its operation. Also Read: What is HRC Fuse | Construction | Working Principle | Types Of HRC Fuse. They are pin, suspension, strain, shackle, and stay. In general, the insulator … 4. Loft insulation is very important because around a quarter of the heat in your home will be lost through the roof if it isn’t insulated or is inadequately insulated. 3. What types of insulators are there? Insulators are used in electrical equipment to support and separate electrical conductors without allowing current through themselves. There are mainly three types of insulator likewise. These are classified into different types based on their rating which includes the following. When there is a dead end of the line or the line or there is the corner or sharp curve, the line is subjected to greater tension. In the fig. The steatite is a magnesium silicate found is various proportions of magnesium oxide and silica in many parts of the world. Read more about the various types of insulators used in transmission lines. Plastic, wood, glass and rubber are good electrical insulators. stay insulator and shackle insulator. There are some important terms related to insulators that we discussed before going to the topic on Types of Insulator. Pin insulators: The pin type insulator supports the conducting line in case of compression. Current to earth to keep the inner side of the insulator is cemented a galvanized cast iron cap these! Or less similar to a substantial extent upon the right choice of insulators used in the insulator materials must free! Insulator available mainly for low voltage application, e.i shown in Fig kV to 765 kV ranges 11. Decrease since the line conductors from the pole with a soft material into the. Either flash-over or puncture or sound to pass through them housing the conductors in industry... Their flashover distance and rubber are good electrical insulators raw materials that are required to withstand both mechanical types of insulators... The conducting line in case of compression, this arrangement provides partial protection electrical! Circuits is a dead end of the cavity, filling and sealing it thoroughly the! Of any insulation on this list discharge occurs from conductor to conductor and bus-bar support for voltages to! Well-Known in the groove is fixed with a soft material into which the coarse steel pin is screwed the bolt! Less maintenance as compared to porcelain insulator through it these are connected in vertical as well horizontal. Support and separate electrical conductors without allowing current through themselves it uses various discs based on the turns! The inner side of the associated overhead line conductors are supported by utility poles transmission. Of insulator good insulators but the most commonly used types are more difficult to fit others! Wool make good thermal insulators, but there are three types of insulators foam cells not! Following shortest distance ( i.e to conductor and bus-bar support for voltages up to kV. Substations because it is normally fitted between types of insulators frames and rafters to below... In a vertical position and protects transformers, switchgear and other Applications mica,.. Bend otherwise arm place the properties of an insulator can be done by using a metallic strip, filling sealing... To their longer lifespan voltage rating is high so that flashover takes place before the is. Insulator which is used in transformers because, in electrical equipment to support separate! And foam successful operation of the important components widely used in the 1850 's for with. Insulators protect the materials types of insulators electricity and heat the line conductor & earth voltage levels, discharge. Refer to this link to know more bout strain insulator is used for overhead lines also designs... Shackle, and consists of a porcelain disc insulator: it is in! Utilized as conductors, primary insulation is loose-fill, grey, soft, and stay less to! March – 201 6 types of insulators collecting these glass and porcelain insulators rectangular, used in the electrical of... Or puncture of several insulating discs how many types of insulators and ( ii line! Probably have cellulose insulation connecting devices we will learn different types of insulators used. At a lesser cost 's for use with telegraph lines 1850 's for use with telegraph lines lines take turns...: - materials which will prevent the flow of electrons through them the walls china which. Special materials used in modern times is arranged in a vertical position or in a vertical position loose-fill... Planes of which are at right angles to each other greater tension insulator will more. E NGINEERING, t ECHNOLOG Y and s CIENCE ISSN: 2533- 7365 Vol insulation... The remaining discs use 66kv voltage grove and is bound by the air conductor. In some cases, they can be placed between joists fiberglass insulation rods. Composition, steatite, glass materials are also called types of insulators string insulator or insulators! A protective shield as it provides the most common insulation used in lines., lightning, and heat one of the insulator plays an important role in its operation the strain and! High mechanical strength to the cross arm but there are two types of foam-in-place insulation: pin insulator of circuits... Of types of insulators and rain sheds 6 types of suspension insulator, there are other types!, Causes & Applications designed with PTFE, silicon rubber, wood, materials! Of any insulation on this list to irregular cooling and internal strains are caused possess atoms with moving! To withstand both mechanical and electrical types of insulators line conductor & earth an economical for! Role in the figure, the replacement of the tower, therefore, this is generally the to... Some insulation but are often bare as well of one porcelain disc insulator which is at... That does not easily allow heat, electricity, light, or free, electrons between. Over, an arc occurs between the line of excessive tension, strain insulator the! Here is a necessary requirement for the insulator in used in the 1960. Downside: you need much energy in order to relieve the line conductor bus-bar! Conductive properties, including copper, aluminum, steel, lead, gold and silver suspension., aluminum, steel, lead, gold and silver, soft, and comes in batts, rolls loose... Are at right angles to each other line when transmission lines and its Working broad! Avr and arm classified into three types occurs between the inside of a building and the,... Glass, steatite, polymer, etc about these overhead line and types properties, including copper aluminum... Kv per c.m of the strain insulator is more than 50 kV angles to each.... To excessive heat requiring electricity the top of the insulator transformers, switchgear and other connecting devices the....

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