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Topic: Electrical insulators


In the News (Sat 20 Apr 19)

  
  insulators- FREE insulators Information | Encyclopedia.com: Facts, Pictures, Information!
Electrical insulators are commonly used to hold conductors in place, separating them from one another and from surrounding structures to form a...
Common heat insulators are, fur, feathers, fiberglass, cellulose fibers, stone, wood, and wool; all are poor conductors of heat.
Apparently, the role of glial cells is to act as mediators of normal neuronal metabolism and/or as insulators between neurones to prevent unwanted...
www.encyclopedia.com /SearchResults.aspx?Q=insulators   (1215 words)

  
  Electrical insulation - Wikipedia, the free encyclopedia
Electrical insulation is the absence of electrical conduction.
Electrical power cables may be insulated with polyethylene, PVC, rubber (natural or synthetic), impregnated paper, teflon, or even compressed inorganic powder, depending on the application and voltage class.
Flexible insulating materials such as PVC (polyvinyl chloride) or neoprene are used to insulate the circuit and prevent human contact with a 'live' wire.
en.wikipedia.org /wiki/Electrical_insulation   (1598 words)

  
 Electrical insulation - Wikipedia, the free encyclopedia
Pin-type insulators were unsatisfactory over about 40,000 volts.
In old apparatus made up to the early 1970's, boards made of compressed asbestos may be used; while this is an adequate insulator at power frequencies, handling or repairs to asbestos material will release dangerous fibers into the air and must be caried out with a high level of precautions.
Electrical power cables may be insulated with polyethylene,PVC, rubber (natural or synthetic), impregnated paper, teflon, or even compressed inorganic powder, depending on the application and voltage class.
en.wikipedia.org /wiki/Insulators   (1597 words)

  
 Class Definition for Class 174 - ELECTRICITY: CONDUCTORS AND INSULATORS
This class is for inventions relating to the structure of electrical conductors and insulators and insulators and the apparatus specialized to mounting, supporting, encasing in conduits, and/or housing the same.
Insulators are placed here when the structure thereof is claimed, which structure is specially designed for spacing two or more devices of different electrical potential from each other or for spacing one or more devices from ground.
for electric lamps and electronic tubes which are provided with a getter or gas or vapor generating material to preserve, maintain, or used to secure a desired vacuum or gas or vapor atmosphere within the envelope of the device.
www.uspto.gov /go/classification/uspc174/defs174.htm   (5218 words)

  
 Electrical insulator
Electrical insulators are used to support electrical conductors and/or electrical devices to prevent the loss of electric charge or current therefrom.
Generally, insulators are used to simultaneously insulate and mechanically maintain or support power transmission lines or naked wires of electric equipment, and include a plurality of bellows to achieve sufficient dielectric strength in order to increase the distance thereof per surface area.
Insulators of organic or inorganic materials such as ceramic, glass, plastic and resin are used for separating conductors so as to prevent undesired flow of current from the conductors to other objects.
www.electronics-manufacturers.com /products/electrical-electronic-components/electrical-insulator   (357 words)

  
 [No title]
Insulated aerial low-voltage cable connectors and splices shall meet the requirements of UL 486B for aluminum composition and aluminum-composition to copper terminators; and the requirements of UL 486A for copper to copper terminators.
Horizontal line-type post insulators shall be used for armless construction and shall have the same mechanical and electrical ratings as vertical line-type post insulators for the ANSI class indicated, but shall be modified to be suitable for horizontal installation.
Pin insulators for use on voltages in excess of 6,000 volts phase-to-phase shall be radio-interference-free or else line-post insulators shall be used.
www.sandia.gov /engstds/ConstSpecs/Div_16/16401_Electrical_Distribution_System_Aerial.doc   (8814 words)

  
 Glossary of Insulator Terms
The line wire is attached to the insulator with a tie wire and generally rests in the saddle groove or wire groove of the insulator.
This serves the same purpose as the strain insulator except it is designed to allow linking of additional insulators (similar to suspension disks) for protection at higher voltages were it is desired to insulate horizontal spans or dead-ending of feeder wires.
A marking technique used on porcelain insulators similar to incuse marking where the insulator is struck with a stamp that indents an entire area while leaving a raised marking, as opposed to the indented incuse marking.
www.insulators.com /general/glossary   (4645 words)

  
 Insulators manufacturers & suppliers
A composite insulator comprises a structurally strong core or rod typically made of fibreglass, a series of electrically insulating sheds, and two metal end fittings crimped onto the exposed ends of the electrical insulator.
Electrical polymer insulators are used in power transmission and distribution systems to provide mechanical support for the conductors and provide electrical insulation between the high voltage conductors and grounded tower structures.
Suspension insulators used to be made of strings of porcelain insulators having a size and shape required of that material to provide the necessary mechanical strength, dielectric strength and creepage distance.
www.electronics-manufacturers.com /Electronic_components/Insulators   (979 words)

  
 Roechling-Glastic Composites: Electrical Standoff Insulators
Insulators 1603, 2015, 1461,1872, 4610 and 4640 are UL Recognized according to UL Standard for Safety 891.
Insulators are primarily intended to be used indoors or inside a suitable enclosure.
One end of the insulator is bolted to a flat plate and force is applied to the insert on the other end in a direction parallel to the end at a distance from the plate equal to the insulator height.
www.glastic.com /esi.htm   (445 words)

  
 Chapter 19. Electrical Properties
Electrical conduction requires that electrons be able to gain energy in an electric field; this is not possible in these materials because that would imply that the electrons are promoted into the forbidden band gap.
Conduction in insulators is by electrons in the conduction band and by holes in the valence band.
A dielectric is an electrical insulator that can be made to exhibit an electric dipole structure (displace the negative and positive charge so that their center of gravity is different).
www.virginia.edu /bohr/mse209/chapter19.htm   (2258 words)

  
 The Riverside Company
PPC is one of the nation's largest manufacturers of electrical porcelain insulators, which are used in overhead electrical utility distribution systems.
Electrical porcelain insulators are an essential component in the generation, transmission and distribution of electricity.
Overhead transmission or distribution line insulators, which are commonly used on wood poles, steel towers, or underground systems to insulate the electrified wire from the rest of the structure.
www.riversidecompany.com /news/n_p_ceram.php   (897 words)

  
 Volcanic Ash—Effects on Power Supply and Mitigation Strategies
Insulation that has 30 percent or more of its creepage distance either clean or dry has a low probability of initiating insulator flashovers.
Substation insulators are more susceptible to flashovers than line insulators because of their distinct shape and orientation.
On 17 June 1996 electricity supplies were disrupted in parts of Rotorua city after an explosion at a local substation caused by ash and water settling on a transformer due to a resident's hosing ash from the roof of a neighboring building.
volcanoes.usgs.gov /ash/power   (1362 words)

  
 Electrical Insulators: The Vista Historical Museum
The use of electrical insulators are declining since many telephone lines are now being run underground.
Many insulators were made in different colors so that linemen could visually trace a wire over a long distance on a cross arm that had many different wires on it.
Some early insulators such as the E.C.and M. of San Francisco (made in the 1870’s) were made in a two piece mold.
www.geocities.com /vistahistoricalmuseum/vista/insulators.htm   (620 words)

  
 The World Market for Electrical Insulators of Ceramics: A 2004 Global Trade
I have developed a methodology, based on macroeconomic and trade models, to estimate the market for electrical insulators of ceramics for those countries serving the world market via exports or supplying from various countries via imports.
Combined, Chapters 3 and 4 present the complete picture for imports and exports of electrical insulators of ceramics to and from all major countries in the world.
"Electrical Insulators of Ceramics" as a category is defined in this report following the definition given by the United Nations Statistics Division Classification Registry using the Standard International Trade Classification, Revision 3 (SITC, Rev. 3).
www.mindbranch.com /Electrical-Insulators-Ceramics-R307-4903   (686 words)

  
 The World Market for Electrical Insulators for Materials Other Than Glass or
I have developed a methodology, based on macroeconomic and trade models, to estimate the market for electrical insulators for materials other than glass or ceramics for those countries serving the world market via exports or supplying from various countries via imports.
Chapter 4 does the same, but for imports of electrical insulators for materials other than glass or ceramics for all countries in the world.
Combined, Chapters 3 and 4 present the complete picture for imports and exports of electrical insulators for materials other than glass or ceramics to and from all major countries in the world.
www.mindbranch.com /Electrical-Insulators-Materials-R307-4902   (800 words)

  
 Conductors and Insulators
Copper is still the most popular material used for wires because it is a very good conductor of electrical current and it is fairly inexpensive when compared to gold and silver.
Insulators are used to protect us from the dangerous effects of electricity flowing through conductors.
If the voltage is high enough, electric current can be made to flow through even materials that are generally not considered to be good conductors.
www.ndt-ed.org /EducationResources/HighSchool/Electricity/conductorsinsulators.htm   (456 words)

  
 INMR: May/June 2000: Routine Electrical Testing of Composite Polymer Insulators
A major difference between the specifications for traditional ceramic cap and pin suspension insulators and composite polymer insulators is the requirement of a routine mechanical and electrical (MandE) test for the former type.
For composite polymer insulators, where there are no intermediate metal parts, the length of the insulator can vary from only a few centimeters to five meters or more, depending on voltage class.
Considering that live-line insulator replacement is a rare event, some users perform electrical tests on their own batches of such insulators earmarked for this change-out practice.
www.inmr.com /issues/2000/may_jun/05_Ravi/ravi.htm   (517 words)

  
 Electrical Insulators Manufacturers & Suppliers
Electrical insulation tapes are flexible polyvinyl chloride tapes coated with rubber-based adhesive or oil base glue...
PVC insulating tapes are made from polyvinyl chloride (PVC) as the backing material, which are coate...
Insulation crease paper is one of the most important solid insulation of the transf...
www.alibaba.com /showroom/Electrical_Insulators.html   (285 words)

  
 Electrical Insulators Manufacturer,Ceramic Electrical Insulators,Electrical Insulators Supplier,Ceramic Insulator ...
CJI PORCELAIN is a manufacturer, supplier and exporter of electrical insulators in India.
The company was established in 1988 by a group of professionals with a vision of creating an enduring benchmark in India for qualitative excellence in Ceramic Electric Insulators.
Our core customer is the Electric Utilities and OEM's in India and abroad that cater to the vital requirement of every human being's well being, his inherent need for energy.
www.hvinsulators.com /profile.html   (671 words)

  
 KEMA - Insulators
In the transmission and distribution of electrical energy, insulators have the important task of creating a barrier between live voltage and the ground, while providing strong mechanical support.
Insulators have to withstand electrical, mechanical and even weather ageing stresses.
Insulators are used at various locations in a power network and their insulation and mechanical characteristics must ensure a long-lasting barrier.
www.kema.com /high_and_medium_voltage/high_and_medium_voltage_components/insulators   (241 words)

  
 Electrical & Electronic Insulators Sellers, Suppliers, Exporters, Manufacturers, Factories
Characteristics and applications: 1) With high mechanical strength, electrical properties and good moisture    resistance properties 2) Widely range of applications, for example: suitable for using as insulating....
For example: suitable for using as insulating structural parts of machinery and electric....
It is widely used in a variety of applications, such as the insulation of electrodes in lithium ion se....
www.fuzing.com /ctt/001236/Electrical-and-Electronic-Insulators   (694 words)

  
 Scientific Principles
Electrical Conductivity is a function of a material's ability to carry an electrical current.
In insulators, this energy gap is relatively large and in semiconductors, the energy gap is intermediate.
Although insulators and conductors are useful in their own right, semiconductors such as silicon and gallium arsenide have dramatically changed the way in which billions of people live.
matse1.mse.uiuc.edu /~tw/sc/prin.html   (4706 words)

  
 Neetrac Insulator Evaluation
NEETRAC has the equipment and expertise to evaluate the electrical and mechanical properties of insulators to ensure proper system performance.
Insulators are evaluated with special tests designed to simulate or accelerate field conditions.
All tests are performed in accordance with the ANSI, C29 and IEC 383, IEC 575 standards for electrical power insulators.
www.ece.gatech.edu /research/NEETRAC/insulators.htm   (85 words)

  
 Solutions for Electrical   (Site not responding. Last check: )
The 3M electrostatic animal guard is an electrostatic barrier which attaches to energized electrical insulators and bushings rated up to 36kV.
Jim Guthrie, a retired electrical worker from Iowa-Illinois Gas & Electric, recognized the problem of animal-caused outages from his many years working for a utility.
The 3M Electrical Markets Division, based in Austin, Texas, designs, manufactures and markets products for electrical construction, industrial maintenance, utility and industrial power businesses, and electrical/electronic devices produced by original equipment manufacturers.
www.3m.com /market/electrical/elpd/news/press_animal.jhtml   (301 words)

  
 Open Directory - Business: Electronics and Electrical: Substation and Transmission
Narindra Electricals - Manufacturers of distribution and power transformers for rating upto 5000kva and servo voltage stablizers for rating upto 2000kva capacity.
T and R Electric - Distributor of new, rewound and reconditioned power and distribution transformers, voltage regulators and switchgear.
Zhongshan Taifeng Electric Co., Ltd - Manufacture electric current mutual inductor, voltage mutual inductor, distribution transformer and reactor, precision mutual inductor and a complete set of test device of mutual inductor.
www.dmoz.org /Business/Electronics_and_Electrical/Substation_and_Transmission   (2868 words)

  
 Bulk and Sheet Molding Compound Electrical Components Insulators
Superior electrical insulation, heat resistance, and dielectric properties make Bulk Molding Compound (BMC) and Sheet Molding Compound (SMC) an excellent choice for insulating components of switch gear, circuit breakers, stand off insulators, and motor brush holders.
Thermoset compounds exhibit excellent electrical resistance due to the network of cross-linked molecules that create a rigid structure, where molecules are held in place by chemical bonds.
Compounds made with thermoset binders, therefore, have the ability to maintain both physical and electrical properties under mechanical loads during prolonged exposure to elevated temperatures.
www.idicomposites.com /electrical.php   (183 words)

  
 CMP | Electrical Safety Myths
If you remain in the vehicle, the path of the electricity will be on the outside of the vehicle; through the tires, and into the ground.
Furthermore, the lines that are insulated are exposed to rough weather, so you never know what condition the insulation is in.
Our system can't distinguish between an increase in request for electricity caused by a break in the line or because many people in one area are coming home from work and turning on their electrical appliances.
www.cmpco.com /UsageAndSafety/electricalsafety/safetymyths.html   (588 words)

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