The st suspension type classification system was born out of a simple need. The bidder shall have to submit all the required type test reports for the offered item. The pin hole thread is of the cemented zinc thimble type. The number of discs in series will vary with vary in working voltage. Fsk russian homologation lapp post ceramic 330750kv. Normally,these are used up to and including 400 kv. An insulator or insulator unit in which the length of the shortest puncture path through solid insulating material is less than half the arcing distance. Each suspension shell undergoes rigorous electrical testing before and after assembly before being shipped. Pdf the voltage distribution of insulator strings, which are very common in the suspension of overhead transmission systems, is greatly uneven. Catalogue numbers 81022, 81012, 86012, 84300 conform to. Ppc insulators standard suspension insulators with high mechanical and electrical strength are designed to meet the most modern demands of high voltage and ehv transmission line usage today. The successful operation of an overhead line depends to a considerable extent upon the proper selection of insulation. Pdf investigating the effects of disc insulator type and corona. Therefore, in this types of insulators in transmission lines insulator is not economical beyond 33 kv.
Unlike the others, pin insulators are directly connected to the physical support compared to being suspended from the wire. It consists the number of porcelain insulator units connected with each other by metal links to form a flexible string. As per the voltage grade the no of disc isolators are increased or decreased so that is is suitable for any voltage level. Electrical and electronics engineering electrical and. If the voltage is 33 kv then three disc is required in series. From the early prototypes in 1971, through full scale introduction in 1976, and through the succeeding years, hilite insulators have featured conservative design and highquality. Ijsrd international journal for scientific research. Ppc insulators makes one of the widest ranges of ansi approved ballsocket and clevis type distribution suspension insulators for. For wet process porcelain and toughened glass insulatorssuspension type 1 scope this standard covers suspensiontype insulators, 414 inches 108 millimeters in diameter and larger, made of wetprocess porcelain or of toughened glass and used in the transmission and distribution of electrical energy. Insulators for overhead lines with nominal voltage above v. At high voltages pin type insulators becomes more bulky,cumbersome and uneconomical. So, strain or tension insulator a design for handling mechanical stresses at angle. Fsk russian homologation lapp post ceramic 35220kv.
As one of suspension type insulators for overhead lines, polymer suspension insulator with the voltage ranging from 10kv to 36kv are mainly used in high voltage distribution line. Class a insulators are considered to be unpuncturable. Suspension type insulators are cheaper than pin type insulators for voltages beyond 33 kv. 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. How can we know the rating of a transmission line by the. Unlike the others, pin insulators are directly connected to the physical. Meister international is a proud member of the national association of electrical distributors and has over 35 years of international industrial business experience. Indepth study and practical knowledge on this subject is. Our product range includes ceramic insulator, porcelain insulator, glass insulator, composite insulator, fuse cutout, surge arrester, power fittings, lamp holder, porcelain lampholder etc. Electronics insulators line post porcelain 106 au insulators tietop t xarm ground end live end pin post gain base vertical clamp top c. The top grooves of the insulator shall be suitable for bare.
There is a groove on the upper end of the insulator for housing the. There are two types of construction in disc insulators 1 cemented cap type and 2 hewlett or interlinking type. Our offer includes solutions in isolation and protective equipment for use, distribution and transmission of energy. May 22, 2018 advantages of suspension type insulator. Each unit or disc of suspension type insulator is designed for low voltage,usually, 11kv depending upon the working voltage, the desired number of discs can be connected in series. Aug 24, 2011 advantages of suspension type i suspension type insulators are cheaper than pin type insulators for voltages beyond 33 kv. This standard applies to single insulator units only and does not apply to long rod insulators. There are several types of insulators but the most commonly used are pin type, suspension type, strain insulator and shackle insulator. However, there is a significant thing to be considered in case of these string insulators, known as string efficiency. We offer suspension, line post, braced post, bell equivalents and custom insulator assemblies. Meister internationals suspension insulators are made to be more cost effective than pin type insulators when it comes to high voltage transmission. Pin type insulators pin type insulators or pin insulators are popularly used in electric distribution systems up to 33 kv voltage level.
The cost of pin type insulator increases rapidly as the working voltage is increased. Pin type insulator can be one part, two parts or three parts type, depending upon application voltage 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. The latest editions of the following standards are relevant to nonceramic composite insulators. All of which are manufactured under international standards such as iec and ansi among others. For suspension type of insulators, the ratio of voltage across the whole string to the product of number of discs and the voltage across the disc nearest to the conductor is known as string efficiency. Mps offers a wide variety of polymer and glass transmission insulators for your power and utility construction needs. Dry, solid insulating materials resistance test to highvoltage, lowcurrent arc discharges. Types of insulators in transmission lines electrical4u. Solved calculation of string efficiency for suspension. Gostr certificate for the full range of post ceramic lapp insulators s. Insulators types of electrical insulators in overhead lines. However, when the voltage exceeds 33 kv, suspension type insulators are recommended.
Orientporcelain suspension insulators,porcelain disc type. Insulators shall be interchangeable and shall be suitable for forming either suspension or tension string. Types of insulators in transmission lines properties of. String efficiency of suspension insulators and methods of. For high voltages 33 kv, it is a usual practice to use suspension type insulators consist of a. Therefore, this type of insulator is not economical beyond 33 kv. Polymer insulator line post insulators manufacturer from. Today these composite insulators made of highgrade synthetic materials have exhibited outstanding mechanical and electrical characteristics,and have exceeded all overhead line and switchgear engineering applications in more than 50 countries worldwide. How suspension insulator looks the suspension type insulator comprises of number of porcelain discs. Aug 24, 2011 there are several types of insulators but the most commonly used are pin type, suspension type, strain insulator and shackle insulator. Product search, catalog, cad drawings, station post, polymer, line post, suspensions, rodurflex, step, 3d, models. Disctype insulators applied as a strain tension string. Suspension insulators ppc insulators standard suspension insulators with high mechanical and electrical strength are designed to meet the most modern demands of high voltage and ehv transmission line usage today.
Whether you need suspension insulators, tie top line post insulators, pin type and high voltage pin type insulators, or spool and guy strain insulators. Gostr certificate for the full range of longrod porcelain lapp insulators gostr certificate for the full range of post ceramic lapp insulators s. Thread overall length a shank length l length p max. Suspension type insulator consist one or more insulator unit connected together to form a string and hanged to the cross arm of supporting structure or tower and carry power conductor at its lowest extremity. Disc insulators with extended creepage distances shall have measurements in. The polyethylene surface is coupled with the multiple skirt design. Sediver toughened glass suspension insulators iec bs ansi. Single or multiple pin insulators can be used on one physical support, however, the number of insulators used depends upon the applications voltage.
In this case, suspension type insulators are used to insulate the high voltage transmission lines. We are an approved vendor in most discoms in india also supplied material in different part of africa. Mechanical design of overhead lines cedengineering. With a pin insulator the conductor is connected to the insulator and is above the crossarm. Insulators standoff type 26 insulators strain type insulators suspension type 6 insulators tietop type 4 insulator racks 3 add qtys to cart. The conductor is suspended at the bottom end of this string while the top end is secured to the crossarm of the tower. Transmission insulators archives maclean power systems. Orientsuspension type insulators,polymer suspension insulator. Pin insulators are the earliest developed overhead insulator, but are still commonly used in power networks up to 33 kv system. In this example, we selected a suspension insulator.
Suspension type insulator posted on august 24, 2011 by k10blogger for high voltages 33 kv, it is a usual practice to use suspension type insulators shown in figure. For high voltages 33 kv, it is a usual practice to use suspension type insulators shown in fig. In case of suspension insulators, the conductor is below the crossarm connected and suspended from. Our entire, interactive transmission catalog is also available for your viewing. When our customers think of trouble free transmission insulators with the longevity to outpace life time expectations of the transmission lines supported, they think of porcelain suspension insulators from lapp insulators. We offer an deal in wide range of polymer post insulators which include suspension long rod silicone rubber insulators, pin type composite insulators, station post polymer insulators, cross arm silicone rubber insulators, electrified railway polymer insulators, polymer dise insulator, polymer lighting aresster. Using post insulator in higher voltage is not economical and suspension type insulator is evolved. Glass fibre rod stay insulator of the 100kn type may be used instead of the fully glazed porcelain insulator. Each unit or disc of suspension type insulator is designed for low voltage, usually 11 kv. A suspension type string insulator consists of a number of porcelain discs connected in series through metallic links. Mar 09, 20 advantages of suspension type insulators1. 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.
Rashtriya electrical is a wellrenowned company and is indulge in the business of overhead line insulator form 1969. Pin insulators are one of three types of overhead insulators, the others being strain insulators and suspension insulators. Suspension insulators or string insulators are very widely used in electrical overhead transmission system. This specification applies to pin, strain shackle, line post and long rod insulators, which will be installed on 3 phase 0. There are few insulator types but the most typically used are pin type, suspension type, strain insulator and shackle insulator. Insulators for overhead lines composite suspension and tension insulators for a. The mv stay insulator shall be of the 100kn type for 7 4. 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. Types of insulators complete knowledge database of.
We assign numbers starting first on smallest to largest diameter, then least to most number of petticoats, then length of outer skirts and inner petticoats. Disc insulators are connected together in series to make a string which is suspension type insulators. This constitutes a series of connected capacitors, with each ones capacitance being created by two successive metal connectors clips with the porcelain as a dielectric. Normal type disc insulator with ball and socket coupling is not acceptable. Porcelain insulator,porcelain suspension insulator,pin type. Technical specification for porcelain insulators revision year 2001. Suspension insulators are what originally made high voltage transmission possible, and consist of individual units designed to. 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. Select p or s for post or suspension, respectively, and fill in your selection in the box designated for a.
Voltage distribution in a suspension insulator strain. Pin type insulators are used for transmission and distribution of electric power at voltages. Shop for insulators suspension type from platt electric supply. Electrical centre a 1 11 kv 45 kn disc insulator nos 260. Three tenders for the supply of a different capacity and ring type low voltage current transformers, b galvanized structural rods complete with related accessories according to drawing 912 and 102, also c 22 kv suspension insulator without bolt.
Polymer insulator we manufacture all types of polymer insulator in india, delhi. A suspension insulator strain consists of a series of alternately insulators and metal parts, which bind each insulator to the next. Advantage of suspension type insulator over pin type insulator. Depending upon the working voltage, the desired number of discs can be connected in series. Jun 27, 2019 because of limitations of pin type insulators for higher voltage, suspension type insulators are used. Pdf a detailed investigation of overhead line insulators. Suspension insulator article about suspension insulator by. The suspension insulator separates the line conductors and supports them electrically. This standard applies to wetprocess porcelain and toughened glass suspension type insulators used on ac overhead power lines with a nominal voltage greater than v and a frequency not greater than 100 hz. Mar 27, 2020 for low voltage power transmission applications, a pin type insulator is useful. Class b insulators are considered to be puncturable. This constitutes a series of connected capacitors, with each ones capacitance being created by two successive metal connectors clips with the. In absence of this, the evaluation shall be carried out. A number of porcelain discs are connected in series to form this insulator.
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