Line post distribution strain insulator is an electrical insulator that is designed to work in mechanical tension strain, to withstand the pull of a suspended electrical wire or cable. The voltages shown in the following cases are those used in g. American national standard for insulators wet process porcelain and toughened glassdistribution suspension type electric power connection for substations american national standard for wetprocess porcelain insulatorsstrain type. Mar 09, 20 strain insulators aretypically used for higher voltage transmissions 33. With further increase of the strain the band gap decreases, vanishing at a critical strain value which depends on the strain type where hgse undergoes a transition from. Overhead products insulators insulators strain type. Difference between suspension and strain insulatorsorient. Fiberglass guy strain insulators are now available with the quality and performance you expect from alumaform. Straintype insulators application for high voltage transmission lines, strain insulator consists of an assembly of suspension insulators. Insulators are made from high quality fiberglass rod.
For low voltage lines insulators are used as strain insulators. When there is a dead end of the line or there is corner or sharp curve, the line is subjected to greater tension. Suspension and strain insulators are the same thing. In conductor selection, reference should be made to the nec and chapter 10 of this book, single 6oovolt aluminum conductors are also widely used as underground service entrance, distribution, and feeder cables, covered in underground section, page 74. An insulator, also called a dielectric, is a material that resists the flow of electric current. Guidelines for utility installations part 1 wire lines and. Shackle type insulatorsshackle type insulators, similar to strain type insulators, are used onsharp curves, end poles and in section poles. In order to relieve the line of excessive tension, strain insulators are used. In such places the suspension insulator but is designed to hold much insulator must not only be a good insulator electrically heavier physical loads. A strain insulator is an electrical insulator that is designed to work in mechanical tension strain. Shackle type insulators however, unlike strain insulators,shackle insulators are designed tosupport lower voltages. The latest editions of the following standards are relevant to nonceramic composite insulators. Strain insulators ansi standard type h1 d standard particulars fig.
Gray glaze is standard on all station post insulators. Covers straintype insulators made of wetprocess porcelain and used in the transmission and distribution of electric energy. Straintype insulator is generally used at line terminal and at dead end, at road crossings, in case of overhead lines with cables crossing the river and also at angle tower. Pin type insulator can be one part, two parts or three parts type.
What links here related changes upload file special pages permanent link. A strain insulator is an electrical insulator that is designed to work in mechanical tension strain, to withstand the pull of a suspended electrical wire or cable. Typical application areas for different types of insulators. Insulators standoff type 26 insulators strain type insulators suspension type 6 insulators tietop type 4 insulator racks 3 add qtys to cart. Strain type insulator insulator electricity electromagnetism scribd. Structural advantage of using vstrings when comparing the relative advantages and disadvantages of using suspension insulators vs.
Jan 07, 2019 pin insulators are the earliest developed overhead insulator, but are still commonly used in power networks up to 33 kv system. Several older styles of high voltage strain insulators intended to deadend feeder wires were mounted vertically between two crossarms by means of a wooden or metal rod or pipe. Pin type insulators as the name suggests, the pin type insulator is secured to the cross arm on the pole. What is the difference between pin type, suspension type and strain type insulator. Strain type insulators application for high voltage transmission lines, strain insulator consists of an assembly of suspension insulators. Types of insulatorsthere are several types of insulators but the most commonly usedare pin type, suspension type, strain insulator and shackle insulator. You are free to mix and match the various elements at will.
An electrical insulator is a material whose internal electric charges do not flow freely, and which therefore does not conduct an electric current, under the influence of an electric field. If you cannot read the numbers in the above image, reload the page to generate a new one. Electric power transmission uses three types of overhead insulator. Porcelain products, insulators strain type, porcelain. Easy to install, stafix end strain insulators are constructed for long life using top quality, uv stabilised polymers and porcelain. A strain insulator may be inserted between two lengths of wire to isolate them electrically from each other while maintaining a. Review of types and applications the aluminum association. Pintype insulators are used in both singlepole and hframe construction. This is an effort to classify all porcelain compression guy strain insulators.
Post insulator a type of insulator in the 1930s that is more compact than traditional pintype insulators and which has rapidly replaced many pintype insulators on lines up to 69 kv and in some configurations, can be made for operation at up to 115 kv. Pin type insulators can have up to three parts, depending on the amount of voltage. The suspension insulator is for voltages above 33kv. The conductor is suspended at the bottom end of this string while the other end of the string is secured to the crossarm of the. Dulhunty power insulator section i type iec class xwp70 xwp100 xwp160 creepage distance, mm 400 400 450. European and us are classified side by side, just like with suspension discs in the st system. Insulators clamp, strain, post, suspension, 2parts building a structure is as simple as selecting the desired element from a library of available elements and telling the program where it attaches to other elements. Guidelines for utility installations part 1 wire lines and communications cables. Use of guy insulators guy strain insulators are used to. Provide complete, operating traffic and pedestrian signals, span wires, strain poles, pedestals, illuminated case signs. You may choose to download the entire catalogue or specific catalogue chapters from the list below. There are 5 types of insulators used as electrical overhead insulation pin insulator. Composite suspension insulators for transmission lines. Structural advantage of using vstrings power line systems.
Pin, suspension, and strain insulators are used in medium to high voltage. Government printing office, washington dc 20402, and the water and power. While stay and shackle insulators are mainly used in low voltage applications. Strain type insulator is generally used at line terminal and at dead end, at road crossings, in case of overhead lines with cables crossing the river and also at angle tower. There are several types of insulators but the most commonly used are pin type, suspension type, strain insulator and shackle insulator. The best option for fiberglass guy strain insulators. Ac distribution of electrical power mcqs with answers. Shop for insulators strain type from platt electric supply. For short circuit loads only, the maximum recommended working load is 100% of published ratings when using formulas from ansi c371972. As 3608 insulators porcelain and glass, pin and shackle type voltages. Pin type, suspension type and strain type insulator are important insulators used for high voltage, medium voltage and low voltage lines and made of polymer, also belong to polymer insulators.
Post insulator a type of insulator in the 1930s that is more compact than traditional pin type insulators and which has rapidly replaced many pin type insulators on lines up to 69 kv and in some configurations, can be made for operation at up to 115 kv. There are two basic types of suspension insulators. With a wide selection, there is a type to suit all needs. Types of insulator ppt for school and college student. Insulator electricity simple english wikipedia, the. Strain insulator string has single strain string and double strain string. Announcing the guy strain gs classification system. This work consists of providing required components to complete the following.
There is a groove on the upper end of the insulator for housing the. Click here to watch our end strain insulators instructional video. There are 5 types of insulators used as electrical overhead insulation. They are used in overhead electrical wiring, to support radio antennas and overhead power lines. What is the difference between pin type, suspension type. Orientwhat is the difference between pin type, suspension. This bulletin is an update and revision of previous rea bulletin 651, design guide for rural substations revised june 1978. Pin type insulator can be one part, two parts or three parts type, depending upon application voltage. The most important difference between suspension and strain insulators is the strength, and the strain insulator string strength is higher than the suspension insulator string strength.
Aug 24, 2011 there are several types of insulators but the most commonly used are pin type, suspension type, strain insulator and shackle insulator. Strain insulators aretypically used for higher voltage transmissions 33. The successful operation of an overhead line depends to a considerable extent upon the proper selection of insulation. A perfect insulator does not exist, but some materi. A wide variety of strain insulator options are available to you, such as application, type, and material. Fahrenheit and no wind, shall not be less than the following. Porcelain products insulators strain type add qtys to cart sort by. Busbar insulator, high voltage insulator and low voltage insulator can be porcelain, silicone rubber or epoxy resin. There are several types of insulators but the most commonly used are pin type, strain insulator, shackle insulator and suspension type.
Guidelines for utility installations part 1 wire lines. Strain and shackle type insulator mcqs with answers. Pdf a detailed investigation of overhead line insulators. Covers strain type insulators made of wetprocess porcelain and used in the transmission and distribution of electric energy. The system is broken down by basic type of strain and is sorted from shortestnarrowest to tallestwidest. Suspension and post type insulators for electric power. Straininduced topological insulator phase transition in hgse. Transmission line design manual bureau of reclamation.
The following links will download component library files for use in plspole and tower. There are 5 types of insulators used in transmission lines as overhead insulation. Disctype insulators applied as a strain tension string. Cs type composite silicone insulators up to 750 kv overhead lines for all pollution of the atmosphere levels.
Guys construction requirements for pole line guys electric design manual rev. Shop for porcelain products, insulators strain type, porcelain products from platt electric supply. Dc distribution of electrical power mcqs with answers. Types of insulators in transmission lines electrical4u. A wide variety of strain insulator options are available to you, such as. Your computer may not have enough memory to open the image, or the image may have been corrupted. Splices shall not be made in the crossing span, and preferably not in the adjacent spans.
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