Repair and maintenance of power distribution lines ncert. 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. Selection of insulators should be based on actual specifications for the product as issued by the manufacturer. 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. A pin insulator consists of a nonconducting material such asporcelain, glass, plastic, polymer, or wood. An overhead 3phase transmission line, which has phase voltage 30 kv, is hanging from a three insulators suspension strain. The polyethylene surface is coupled with the multiple skirt design. What is the difference between pin type, suspension type. Products related to 504 porcelain strain insulator, 412 or visit the ppc insulators site. Pin type insulators as the name suggests, the pin type insulator is secured to the cross arm on the pole. A strain insulator is an electrical insulator that is designed to work in mechanical tension strain.
Description the plp polymer insulators are ideal for use in. The cost of pin type insulator increases rapidly as the working voltage is increased. Transmission insulators archives maclean power systems. Shop for insulators strain type from platt electric supply. Difference between suspension and strain insulatorsorient. To support this lateral load, strain insulators are used. The disc insulators are two types a suspension type insulator, b strain or tension insulator. 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. Tensile strain above 1% is found to enhance the resistivity by several orders of magnitude. If a protective corona ring inserts capacitances from the line, with the link of the middle. Pin type insulators pin type insulator as the name suggests, the pin type insulator is secured to the crossarm on the pole.
Complete uptominute specifications and characteristics are given. There are several types of insulators in transmission lines but the most commonly used are pin type, suspension type, strain insulator and shackle insulator. For help with porcelain strain insulator, 412 from ppc insulators, call platt at 8002575288 from 4a. Electrical insulators and accessories elsewedy electric. For 69kv lines, a type of singlepole triangular construction is used. Tapped holes are unified national coarse thread series, 12, 5811, and 3410. Our product range includes ceramic insulator, porcelain insulator, glass insulator, composite insulator, fuse cutout, surge arrester, power.
S use the command to apply column and select the merge length adjustment command. Voltage distribution in a suspension insulator strain. They are used in overhead electrical wiring, to support radio antennas and overhead power lines. Technical specification for overhead line porcelain and.
Both the spool insulators, as well as the guy strain insulators supplied by meister international are manufactured from wet process porcelain. These poles must withstand the lateral horizontal tension of the long straight section of wire. Material used for insulator are following as below. This process allows the spool insulators and the guy strain insulators to shed water and keep dirt away, thus requiring littletono maintenance. Overhead products overhead products insulators insulators strain type. As the name suggests, the pin type insulator is secured to the crossarm on the pole.
Distribution insulator cross references guy strain porcelain suspensions polymer dead ends these equivalents are provided as a reference only. Caps and flanges are made of drop forged steel, malleable iron or ductile iron, and hotdip galvanized. Technical specification for overhead line porcelain and glass insulators. The most important difference between suspension and strain insulators is the strength, and the strain insulator string strength is higher than the.
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. Technical article polymeric insulators submitted by. Thread overall length a shank length l length p max. As the name suggests, the pin type insulator is secured to thecrossarm on the pole. The part sec tion of a pin type insulator is shown in fig. Distribution insulator cross re victor insulator company. 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. Types of insulators complete knowledge database of. There are several types of insulators but the most commonly used are pin type, strain insulator, shackle insulator and suspension type. Fsk russian homologation lapp post ceramic 330750kv. How many type of insulator use in electrical transmission. The shattering rate of glass shells in service is negligible thanks to the high purity of sediver glass. Types of insulator ppt for school and college student.
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. Dc distribution of electrical power mcqs with answers. Types of insulatorsthere are several types of insulators but the most commonly usedare pin type, suspension type, strain insulator and shackle insulator. Pdf dirac points merging and wandering in a model chern. Insulators are generally classified in following types. As the name suggests, the pin insulator is secured to the crossarm on the pole.
Pdf insulator strings are widely used in power systems for the dual task of. N this catalog are listed only pin type and strain insulators and accessory hardware. The main idea of finite element method is divide and combine, to divide is for. The scope of this technical paper is to discuss about construction, types. A pin insulator is a device that isolates a wire from a physical support such as a pin a wooden or metal dowel of about 3 cm diameter with screw threads on a telegraph or utility pole. First suspension tension insulators for 420 kv in 1990. Ac distribution of electrical power mcqs with answers. Its small size and high strength makes it suitable for many industrial applications. Sediver toughened glass insulators are unpuncturable and resistant to overvoltage stresses thanks to a defectfree dielectric body and the homogeneity of the glass shell. An insulator will be found in the following pages which will be correct for any pin type or strain installation.
What is the difference between pin type, suspension type and strain type insulator. Strain insulator a dead end or anchor pole or tower is used where a straight section of line ends, or angles off in another direction. Suspension insulator string has single suspension string, double suspension string, v type suspension string, and so on. Transmission line design manual bureau of reclamation. As a distinctive feature of the present model, phase transitions are associated to dirac points that can move, merge and split in momentum space, at odds with haldanes chern insulator where dirac. There is a groove on the top of the insulator to hold the conductor. Current collector components insulators insulators molded giant strain application giant strain insulator is a small rugged insulator. There are several types of insulators but the most commonly used are pin type, suspension type, strain insulator and shackle insulator. These types of disc insulators are used to hang the conductor below the point of support. Calculate total conductor load combine load plus the loading constant from table 3. Indepth study and practical knowledge on this subject is.
Gray glaze is standard on all station post insulators. Since 2003, meister international has been distributing the finest quality porcelain insulators and porcelain bushings to original equipment manufacturers oems and users of switchgear, transformers and busduct around the world. We are a leading manufacturer, exporter and supplier of power insulators. The guy strain insulators are used in overhead electrical line. We offer suspension, line post, braced post, bell equivalents and custom insulator assemblies. Suspension insulator3 strain insulator and4 shackle insulator. Chocolate glaze is available by deleting 70 from the catalog number. Strain and shackle type insulator mcqs with answers. 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. Types of insulators in transmission lines properties of. For high voltages 33 kv, it is a usual practice to use suspension type insulators consist of a number of porcelain discs connected in series by metal links in the form of a string.
Strain type insulators application for high voltage transmission lines, strain insulator consists of an assembly of suspension insulators. Strain insulator string has single strain string and double strain string. Suspension insulators disc porcelain are the most widely used models. Connected cap types and hewlett or interlinking types are the two types of suspension type insulator. Gostr certificate for the full range of post ceramic lapp insulators s. Lowvoltage eggtype strain insulator, used in utilitypole guy cables to prevent any.
Pin type insulator can be one part, two parts or three parts type, depending upon application voltage. Page 5 of 43 specification ets100101 ver 5 ergon energy corporation limited abn 50 087 646 062 3. Fsk russian homologation lapp post ceramic 35220kv. The versatile neck designs in c, f, k and j, side and top grooves, allow the acceptance of largediameter. Mps offers a wide variety of polymer and glass transmission insulators for your power and utility construction needs. Meister international is a proud member of the national association of electrical distributors and has over 35 years of international industrial business experience. An insulator or insulator unit in which the length of the shortest puncture path through solid insulating material is at least equal to half the arcing distance. Gtztacsr gap type zt aluminum conductor acfr aluminum conductor carbon reinforced accr aluminum conductor composite reinforced insulators porcelain, toughened glass and polymer pin type insulator suspension type insulator strain type insulator shield wires steel, alumoweld and acsr smaller cross section compared to 3 phase conductors. Meister international electrical insulator in stock ready. Pdf finite element analysis of disc insulator type and corona. Types of insulators in transmission lines electrical4u. Therefore, this type of insulator is not economical beyond 33 kv. It is a formed, single layer shape that is made out of a nonconducting material, usually porcelain or glass.
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