Advantages of suspension insulators over pin type insulators. With a proven track record of over 80 years of manufacturing. 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. During river crossing there will be excessive tension in the line. The st suspension type classification system was born out of a simple need. Pin type insulator can be one part, two parts or three parts type, depending upon application voltage. 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. Suspension insulators strength and classification of available end fittings by rod size end fitting type compositz insulator section j available only in australia, new zealand and the south pacific reliable compositz insulators long rod suspension tension. The suspension insulator is for voltages above 33kv. The aging of porcelain insulators is responsible for the failure of. You are free to mix and match the various elements at will. Pin type insulators can have up to three parts, depending on the amount of voltage.
Protected leakage configuration the umbrella type spreading porcelain shell. In addition, a large selection of fittings can be used. Deterioration of porcelain insulators utilized in overhead. Class b insulators are considered to be puncturable. Orientceramic disc insulators,disc suspension porcelain. These capacitances could be made negligibly small by increasing the distance between the insulators and the tower structure which. A number of porcelain discs are connected in series to form this insulator. Today there are over 2000 collectors, and insulator clubs, national shows, and good reference books are available. Suspension insulator string insulator electricity glasses scribd. Technical specification for porcelain insulators revision year 2001. This work highlights investigation of various failures of suspension type porcelain insulators, influencing factors responsible for degradation in. 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. Base line designation nominal voltage kv height creepage mount end h11536 h158 h176 h112 h157 h11632 h168 h11173 h11174 h11461 h11472 h11529 h11654 h11663 h11669 h11647 h11167. Distribution of potential in suspension type insulators.
Aug 24, 2011 advantages of suspension type i suspension type insulators are cheaper than pin type insulators for voltages beyond 33 kv. Ppc insulators makes one of the widest ranges of ansi approved ballsocket and clevis type distribution suspension insulators for. Our entire, interactive transmission catalog is also available for your viewing. Analysis of longterm deterioration characteristics of high. Pdf a detailed investigation of overhead line insulators. Oct 21, 2017 you can read about overhead line insulators here.
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. Transmission insulators archives maclean power systems. The pin type insulator is designed to be mounted on a pin which in. The top grooves of the insulator shall be suitable for bare. Insulators line post porcelain 106 au insulators tietop t xarm ground end live end pin post gain base vertical clamp top c horizontal clamp top h cat no. 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. Insulators are used in electrical equipment to support and separate electrical conductors without allowing current through themselves.
These can be simply noted by the collector when describing the insulator. 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. There are several types of insulators but themost commonly used are. A suspension type string insulator consists of a number of porcelain discs connected in series through metallic links. Types of insulators in transmission lines properties of. Suspension insulator string free download as pdf file. Disctype insulators applied as a strain tension string. Pdf the voltage distribution of insulator strings, which are very common in the suspension of overhead transmission systems, is greatly uneven.
Covers transmission suspension type insulators, 9 inches 228. Some of the advantages of suspension insulators over pin type insulators are explained below. Solved calculation of string efficiency for suspension. This is because of the capacitances formed between the metal parts of the insulators and tower structure. Glass insulators were first produced in the 1850s for use with telegraph lines. Mar 09, 20 advantages of suspension type insulators1. Suspension distribution transmission insulators with the longevity to outpace life time expectations of the transmission lines supported, they think of porcelain suspension insulators from lapp insulators.
Advantages of suspension insulators and pin type insulators. Each disc in a suspension type of insulators is designed for what voltage. The conductor is suspended at the bottom end of this string while the top end is secured to the crossarm of the tower. Here we have definition, rules, test method and acceptance criteria uec composite insulator of suspension type and tension type of international standard iec polymer pin insulator im online chat now. Pdf acrobat reader or word version doc document file size. Suspension insulators often use a standard insulating shell, and can be fitted with a myriad of connection types based on the needs and preferences of an end user. Insulator electricity simple english wikipedia, the free. The neutral and neutral clevis must be covered before any work can be done above. How many type of insulator use in electrical transmission. The number of discs in series will vary with vary in working voltage. The bidder shall have to submit all the required type test reports for the offered item.
Each unit of suspension insulators insulator disc is designed for comparatively low voltage 11kv and can be increase the insulation strength by connecting these insulator disc modules in series. Suspension insulators are identified using the st suspension type numbering system recently developed by shaun kotlarsky and steve coffman. Advantages of suspension insulators over pin insulators. The suspension insulator separates the line conductors and supports them electrically. Depending upon the working voltage, the desired number of discs can be connected in series. Jul 11, 2019 iec 61109 pdf iec insulators for overhead lines composite suspension and tension insulators for a. It is typically used in applications not subject to repeated. 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. Distribution of potential in suspension type insulators by. 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. Electronics insulators line post porcelain 106 au insulators tietop t xarm ground end live end pin post gain base vertical clamp top c. Made up of porcelain it has two holes for the stay wires and the design is such that in case of insulator breakdown, stay wire will not fall on the ground. Stay insulators are used on the wire to create insulation between pole and stay clamp.
The unique design of our rodurflex suspension insulators and the variations possible on account of our patented modular system permit a combination of different installation lengths with different shed profiles and sizes. If the red x still appears, you may have to delete the image and then insert it. Most cap and pin insulators were installed many years ago. The strain insulator is the same as a suspension insulator but it is used horizontally, whereas the suspension insulator is used vertically. If a protective corona ring inserts capacitances from the line, with the link of the middle. Minimum approach distance must be maintained simulated 12kv voltage. It is a formed, single layer shape that is made out of a nonconducting material, usually porcelain or glass. Our hardware is smooth contoured with wellrounded edges to reduce riv buildup and does not require corona rings. They become very bulky and cumbersome when designed for higher voltages.
Pdf investigating the effects of disc insulator type and corona. Suspension type insulators are cheaper than pin type insulators for voltages beyond 33 kv. Suspension insulators are cheaper in cost compared to pin type insulators for operating voltage above 50kv. Silicone cap and pin archives maclean power systems. 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.
In suspension insulator numbers of insulators are connected in series to form a string and the line conductor is carried by the bottom most. This standard applies to single insulator units only and does not apply to long rod insulators. A perfect insulator does not exist, but some materi. Typical application areas for different types of insulators. Hence 2 or more strings of insulators are used in parallel. Plspole is a powerful and easy to use microsoft windows program for the analysis and design of structures made up of wood, laminated wood, steel, concrete and fiber reinforced polymer frp poles or modular aluminum masts.
International practices in use of suspension insulators. The following links will download component library files for use in plspole and tower. In the mid 1960s a few people began collecting these glass and porcelain insulators. 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. Suspension insulators or string insulators are very widely used in electrical overhead transmission system. 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. It can do the work of two suspension insulators in many cases. The label and stock number used in the component file is the catalog no. Suspension insulators are designed to link together into strings, typically of two or more, to provide much higher voltage protection than any single insulator. Class a insulators are considered to be unpuncturable. Voltage distribution in a suspension insulator strain. When porcelain insulators are used for a long duration, the size of the pores.
Base line designation nominal voltage kv height creepage mount end h11536 h158 h176 h112 h157 h11632 h168 h11173 h11174 h11461 h11472 h11529 h11654 h11663 h11669 h11647 h11167 h11170 h11171 h11251 h14056. Assembly is similar to suspension insulators discs are in vertical plain instead of horizontal plain in suspension insulators. Suspension insulator article about suspension insulator by. There is a groove on the upper end of the insulator for housing the. Shop for insulators, porcelain from platt electric supply. The latest editions of the following standards are relevant to nonceramic composite insulators. How can we know the rating of a transmission line by the. Orientsuspension type insulators,polymer suspension insulator.
There will be two polymer suspension insulators at the base of the pole when the team reaches their event. So the increased size, weight and cost of pin type insulator put a limit to its use upto 33kv and therefore suspension insulators are used for high voltage work. Each unit or disc of suspension type insulator is designed for low voltage, usually 11 kv. Insulators are generally classified in following types. We offer suspension, line post, braced post, bell equivalents and custom insulator assemblies. The structure of disc suspension insulators enables them form the insulator string by fitting into themselves one another as per voltage requirement and connecting with the conductors and cable. Analysis and design of structures with wood, laminated wood, steel, concrete and frp poles or modular aluminum masts. You may choose to download the entire catalogue or specific catalogue chapters from the list below. Pin type insulators are used for transmission and distribution of electric power at voltages. For the ansi 25kip, ansi 30kip, ansi 50kip, and ansi 80kip suspension and strain insulators, the length, weight, and leakage values were taken straight from the catalog with no additions made for any. In absence of this, the evaluation shall be carried out.
Insulators wetprocess porcelain and toughened glass suspension type replaced standard. However, there is a significant thing to be considered in case of these string insulators, known as string efficiency. Since they are different heights from normal station posts, mps has developed a variety of these replacement silicone posts that are the exact same height as the porcelain. For high voltages 33 kv, it is a usual practice to use suspension type insulators shown in fig. String efficiency of suspension insulators and methods of. If the voltage is 33 kv then three disc is required in series. Ceramic disc insulators include common disc types and antipollution disc types, such as ansi 52 series, iec series and antipollution disc suspension porcelain insulator. Types of wire conductors most wire conductors are copper. The cost of pin type insulator increases rapidly as the working voltage is increased.
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. Therefore, in this types of insulators in transmission lines insulator is not economical beyond 33 kv. 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. As technology developed insulators were needed for telephone lines, electric power lines, and other applications. Disc insulators with extended creepage distances shall have measurements in. There are several types of insulators but the most commonly used are pin type, suspension type, strain insulator and shackle insulator. Therefore, this type of insulator is not economical beyond 33 kv. The top grooves of the insulator shall be suitable for bare conductor acsr 12020 mm. Failure trends of highvoltage porcelain insulators. The pin hole thread is of the cemented zinc thimble type. 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.
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