In high voltage transmission lines, these insulators include a set of suspension insulators. Types of insulators in transmission lines electrical4u. Insulators for overhead lines with nominal voltage above v. Jun 03, 2006 insulators or suspension type insulators figures 16,17 cotton, 1958. Guy strain insulator series is intended for use with down guys or poletopole guys on overhead lines. The voltage capacity of the strain insulator is 33kv. Features compared to porcelain strain type insulators. The use of strain type insulators is made where the conductors are a dead ended b at intermediate anchor towers c any of the above d none of the above. Types of insulators are used in an overhead transmission and distribution line to provide insulation to conductor from the ground and tower.
Strain and shackle type insulator mcqs with answers. Strain type insulator insulator electricity electromagnetism scribd. For example, the largest onepiece pin type power insulator ever made in the u. As 3609 insulators porcelain stay type voltages greater than v. Interplay of orbital effects and nanoscale strain in. N this catalog are listed only pin type and strain insulators and accessory hardware. Our global team is ready to support you locally, providing you. There are several types of insulators but the most commonly used are pin type, suspension type, strain insulator and shackle insulator. Strain insulators guy breakers shall not touch primary conductors or insulators. Home electrical engineering transmission and distribution question. 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. Pdf a detailed investigation of overhead line insulators.
Complete uptominute specifications and characteristics are given. The post and disc insulators shall comply in all respect with the provisions of the following. The same shall be suitable for use in heavily polluted atmosphere. Types of insulatorspin type insulator, suspension, strain. Pin insulators are the earliest developed overhead insulator, but are still commonly. 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. Figures 16 left and 17 right line insulator assemblies for strain tension left and suspension right applications. Lowvoltage eggtype strain insulator, used in utilitypole guy cables to prevent any voltage on the guy. An insulator will be found in the following pages which will be correct for any pin type or strain installation. It is a formed, single layer shape that is made out of a nonconducting material, usually porcelain or glass. There are several types of insulators in transmission lines but the most commonly used are pin type, suspension type, strain insulator and shackle insulator.
Strain type insulator buswork shield wire steel pole. Ppc manufactures a wide range of low and high voltage pin type insulators designed for distribution. Its small size and high strength makes it suitable for many industrial applications. However, for high voltage transmission lines, strain insulator consists of an assembly of suspension insulators as shown in figure.
The use of strain type insulators is made where the conductors are. 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. The connection of this insulator can be done by using a metallic strip. The tdl suspension insulators used slant sheds to provide natural washing of contamination. The discs of strain insulatorsare used in the vertical plane. The use of strain type insulators is made where the conductors. Gamma insulators and accessories are manufactured in complete accordance to applicable iec and ansi standards, and are preand posttested to ensure their electrical values as well as their conformity to precise tolerances. Ppc insulators for the transmission and distribution of. The versatile neck designs in c, f, k and j, side and top grooves, accepts large diameter conductors for easy tying. The conductor is crimped to a joint which is fixed to the tension insulator in either side. 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 the transmission line, at a corner line is a great tensile load. These insulators are designed to be compatible with pre formed style wire guy grips.
You can also choose from bending, moulding, and welding strain insulators, as well as from low voltage, high voltage, and high temperature strain insulators, and whether strain insulators is insulator, or ceramic parts. What is the difference between pin type, suspension type. Get the best deals on strain insulator when you shop the largest online selection at. Insulators of ceramic material or glass for overhead lines with a. Jan 19, 2021 in order to relieve the line of excessive tension, strain type insulators are used. Guidelines for utility installations part 1 wire lines and. As 3608 insulators porcelain and glass, pin and shackle type voltages not exceeding v a. Suspension and strain type insulator can be divided into normal suspension insulator can anti.
For low voltage lines insulators are used as strain insulators. The insulator string is hanged from the cross arm of the support. Types of insulatorspin type insulator, suspension, strain, shackle. In order to relieve the line of excessive tension, strain insulators are used. Voltage distribution in a suspension insulator strain. This is similar to suspension type insulators because it is used in an overhead transmission system but its specifications and working are somewhat different.
The pin types of insulators are mostly used in the distribution system. Types of electrical insulator in overhead lines circuit. A wide variety of strain insulator options are available to you, such as porcelain, composite polymer, and pp. These insulators are small in size, used in overhead distribution systems.
A suspension insulator strain consists of a series of alternately insulators and metal parts, which bind each insulator to the next. So, each cross arm of tower has two tension strings. Insulator series is intended for use with down guys or poletopole guys on overhead lines. The composite polymer insulators shall be of following type. Technical specification for overhead line porcelain and. Insulator in overhead line and types of insulators. They are designed, manufactured and tested in conformance with ansi standard c29. The conductor is attached to the lower unit of the insulator. Victor guy strain insulators are manufactured from wet process porcelain to ensure a life time of trouble free service. Gamma insulators the power of quality and reliability. Porcelain guy strain insulators are installed in down guys and span guys to create an electric break. Types of electrical insulator in overhead lines circuit globe. Lowvoltage egg type strain insulator, used in utilitypole guy cables to prevent any voltage on the guy. Different types, working with their applications elprocus.
Strain and shackle type insulator mcqs with answers q1. The seattle city light stock numbers for this insulator type are 690104 and 690106. Compared to porcelain strain type insulators, plps. This article discusses an overview of different types of insulators and their applications like pin, suspension, strain, shackle, post, stayand disc type. As 2947 insulators porcelain and glass for overhead power lines voltages greater than v ac. Their use is governed by nesc, section 21, rule 215. Strain type insulators however, for the high voltagetransmission lines, strain insulator consists ofan assembly of suspension insulators asshown in figure. It is thought to be the earliest developed overhead insulator and is still popularly used in power. The insulative fiberglass rod electrically isolates the guy strand and provides electrical clearance for maintenance crews and the public during normal operation. There are 5 types of insulators used as electrical overhead insulation pin insulator, suspension insulator, strain insulator, stay insulator, and.
Fahrenheit and no wind, shall not be less than the following. The insulative fiberglass rod electrically isolates the guy strand and provides clearance during normal operation for maintenance crews and the public. From the mid 1960s on, ce insulators were tested at up to 400 kv service voltage as suspension strain insulators and crossarm in the united kingdom. In order to relieve the line of excessive tension, strain type insulators are used. Current collector components insulators insulators molded giant strain application giant strain insulator is a small rugged insulator. This is the first developed insulators and being used for overhead lines for. To maintain this huge tension, strain insulators are utilized at sharp corners. Free shipping on many items browse your favorite brands affordable prices. Meister international is a proud member of the national association of electrical distributors and has over 35 years of international industrial business experience. You can also choose from high voltage, low voltage strain insulator, as well as from insulator strain insulator there are 864 suppliers who sells strain insulator on, mainly located in asia.
Strain type insulator buswork shield wire steel pole steel. Remarks d r a w i n g f o r t e n d e r steel structure new. Mar 09, 20 for low voltage lines insulators are used as strain insulators. The voltage capacity of this insulator is 33 kv and works in the positions of bend or circular turn. Types of insulators in transmission lines properties of insulators. Single or multiple pin insulators can be used on one physical support, however, the number of insulators used depends upon the applications voltage. Technical specification for overhead line porcelain and glass.
Pin type insulator suspension type insulator strain insulator shackle insulator. As 3609 insulators porcelain stay type voltages greater than v a. Suspension and strain insulators are the same thing. Pin insulators are one of three types of overhead insulators, the others being strain insulators and suspension insulators. For lowvoltage lines insulators are used as strain insulators. A wide variety of strain insulators options are available to you, such as porcelain, composite polymer, and pp. When there is a dead end of the line or there is a corner or sharp curve, the line is subjected to greater tension. Pin insulators are the earliest developed overhead insulator, but are still commonly used in power networks up to 33 kv system. Strain type insulators when there is a dead end of the line or there is corner or sharp curve, the line is subjected to greater tension.
Unlike the others, pin insulators are directly connected to the physical. Types suspension insulators page4 pin type insulators page4 tie top line. Strain or tension is designed for handling mechanical stress at angle positions where there is a change in the direction of the line or at the terminations of the lines. A strain insulator is an electrical insulator that is designed to work in mechanical tension strain.
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