Distribution insulator cross references distribution insulator cross reference chart click here for pdf version pin type insulators pin posts spools victor cat. Strength ratings are made in accordance with ansi standard c29. Our global team is ready to support you locally, providing you. The conductor passes through this groove and is tied to the insulator with annealed wire of the same material as the conductor. Such insulators can be used either in a horizontal position or in a vertical position. So, each cross arm of tower has two tension strings. D insulators pin type insulators highly resistant to lightning puncture, ppc insulators manufactures a wide range of low and high voltage pin type insulators designed for distribution and sub transmission circuits. Strain and shackle type insulator mcqs with answers. Depending upon the working voltage, the desired number of discs can be connected in series. Figures 16 left and 17 right line insulator assemblies for strain.
Overhead products overhead products insulators insulators strain type products related to 541 58 hole strain insulator or visit the meister international site for help with 58 hole strain insulator from meister international. There is a groove on the top of the insulator to hold the conductor. Ansi class vi insulators victor porcelain products cooper lapp ohio brass santana a b chance 88r 552 253s np8d8 6188r 12847 pi 22081 c9052. See the all insulators crown jewels of the wire magazine page. In early days, the shackle insulators were used as strain insulators. Types of insulators complete knowledge database of. The versatile neck designs in c, f, k and j, side and top grooves, allow the acceptance of largediameter. Shackle type insulatorsshackle type insulators, similar to strain type insulators, are used onsharp curves, end poles and in section poles. There are several types of insulators but the most commonly used are pin type, strain insulator, shackle insulator and suspension type. Straintype insulators application for high voltage transmission lines, strain insulator consists of an assembly of suspension insulators. Porcelain insulator,porcelain suspension insulator,pin. Clevis style strain insulator fittings are used in hot line work, primarily for connecting associated hardware to ball and socket type insulators.
At lower utilization voltage the insulation also completely covers the live conductor and acts as a barrier and keeps the live conductors unreachable from human being or animals. There are several types of insulators but the most commonly used are pin type, suspension type, strain insulator and shackle insulator. Beyond operating voltage of 33 kv, the pin type insulators become too bulky and hence uneconomical. All of which are manufactured under international standards such as iec and ansi among others. Dc distribution of electrical power mcqs with answers. Clevis style strain insulator fittings are for use with class 523 insulators specified in ansi c29. As 3609 insulators porcelain stay type voltages not exceeding. Technical article polymeric insulators submitted by. Ac distribution of electrical power mcqs with answers. The strain type insulators are similar to the suspension type as far as they are also ball and socket type, hut the string is horizontal. Strain type insulators when there is a dead end of transmission line or there is corner or sharp curve on line, the transmission line is subjected to greater tension. What is the difference between pin type, suspension type.
The discs of strain insulators employed in hortizontal plane. There is a groove on the upper end of the insulator for housing the. Electrical insulators business asian insulators public. When there is a dead end of transmission line or there is corner or sharp curve on line, the transmission line is subjected to greater tension.
They are secured on the cross arms of the pole to carry power lines. Insulators types of electrical insulators in overhead lines. In order to relieve the line of excessive tension, strain type insulators are used. Covers straintype insulators made of wetprocess porcelain and used in the transmission and distribution of electric energy. For lowvoltage lines pdf of the 2019 membership directory. Fog type disc insulator shall be equipped with a corrosion protection zinc sleeve.
Porcelain pin type insulator mainly includes ansi 553, ansi 554 and ansi 555, and distribution ceramic pin insulator will be used on 11kv or 33kv transmission lines. An insulator will be found in the following pages which will be correct for any pin type or strain installation. Asian insulators public company limited is progressive porcelain manufacturing plant with production flow and stateoftheart raw materials preparation, pug mills and kilns with iso9001 quality assurance program. Conductor wire is passed through this groove and secured by binding with the. The polyethylene surface is coupled with the multiple skirt design. Pin type insulators are used for supporting line conductors. The conductor is crimped to a joint which is fixed to the tension insulator in either side. N this catalog are listed only pin type and strain insulators and accessory hardware. Distribution insulator cross re victor insulators, inc.
The conductor is suspended at the bottom end of this string while the top end is secured to the crossarm of the tower. For low voltage lines shackle insulators are used as strain insulators. They are used in overhead electrical wiring, to support radio antennas and overhead power lines. Each unit or disc of suspension type insulator is designed for low voltage, usually 11 kv.
Strain and shackle type insulator mcqs with answers q1. Disc insulators with extended creepage distances shall have measurements in accordance with table 1. Pin type insulator can be one part, two parts or three parts type, depending upon application voltage. If a protective corona ring inserts capacitances from the line, with the link of the. Tensile strain above 1% is found to enhance the resistivity by several orders of magnitude. Features compared to porcelain straintype insulators.
Pdf a detailed investigation of overhead line insulators. In a 11 kv system we generally use one part type insulator where whole pin insulator is one piece of properly shaped porcelain or glass. Strain insulators aretypically used for higher voltage transmissions 33. 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. They can be directly fixed to the pole with a bolt or to the cross arm. Along with product innovation and improvements to make ai an industry. There is a groove on the upper end of a pin insulator for housing the conductor. An overhead 3phase transmission line, which has phase voltage 30 kv, is hanging from a three insulators suspension strain. 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.
Suspension insulator for voltages greater than 33 kv, it is a usual practice to use suspension type insulators, consisting of a number of glass or porcelain discs connected in series by metal links in the form of a string. Complete uptominute specifications and characteristics are given. Click add to cart to buy meister international 541 58 hole strain insulator. Covers straintype insulators made of wetprocess porcelain and used in the transmission and distribution of. For high voltage transmission line strain insulator consisting of an assembly of suspension type insulator.
Shackle type insulators however, unlike strain insulators,shackle insulators are designed tosupport lower voltages. Pin type insulators or pin insulators are popularly used in electric distribution systems up to 33 kv voltage level. As 3608 insulators porcelain and glass, pin and shackle type voltages not exceeding v a. Which type of insulator is used on 2 kv transmission lines. The purpose of the insulator or insulation is to insulate the electrically charged part of any equipment or machine from another charged part or uncharged metal part. Strain insulator introduction when suspension string is used to sustain extraordinary tensile load of conductor it is referred as strain insulator. Types of insulators in transmission lines electrical4u. But now a days, they are frequently used for low voltage distribution lines. Ppc insulators makes spool and guy strain insulators out of the highest grade electrical wetprocess porcelain in a wide range of electrical values and all resistant to mechanical breakage.
When there is a dead end of the line or there is corner or sharp curve, the line is subjected to greater tension. When there is a dead end of the line or there is a corner or sharp curve, the line is subjected to greater tension. The capacitance between the links and the earth is 0,2 c, where c is the capacitance of an insulator determine the potential distribution along the insulators strain. Guy strain insulator series is intended for use with down guys or poletopole guys on overhead lines. Indepth study and practical knowledge on this subject is. This allows for the manufacture and marketing of high quality insulator products. E shlv1 shlv2 shlv8 lvlp 54 76 32 91 57 80 57 82 39 54 40 52 17 17 1717 12 7 11patt bb1003. In order to relieve the line of excessive tension, strain insulators are used. Voltage distribution in a suspension insulator strain. Seattle city light material standard standard number. Newell offers tie top type insulators with c, f and customized neck, which are available for applications on 1 or 8 pins and in voltage ratings of 15kv, 25kv and 35kv.
Scope this standard details manufacturer requirements for guy strain insulators. Our offer includes solutions in isolation and protective equipment for use, distribution and transmission of energy. Suspension type insulators are cheaper than pin type insulators for voltages beyond 33 kv. The clevis eye is used to connect quadrant type deadends to clevis tongue insulator or yoke plates. For low voltages up to and including 11 kv one piece insulators can be used and two piece insulators are commonly used for 25 kv and for 44 kv up to and including 66 kv three and four piece insulators can be employed.
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