--%>
Assignment Help - homework help

  Rubber and Insulating Fabric

Introduction to Rubber and Insulating fabric

Rubber: Rubber is acquired through vulcanizing raw rubber [natural/synthetic]. Ordinary electrical insulating rubbers comprise the following electrical characteristics within normal conditions:

The electric strength of organic rubbers powerfully relies on the sort of current included, the degree of stretch, and the time through which the voltage remains applied. While left un stretched and subjected to a short-time 50 Hz test voltage, rubber will comprise an electric strength under the following limits, relies on the pure-rubber constant.

For a 20 to 25 % rubber content...........20 to 30 kV/mm

For a 30 to 35 % rubber content...........30 to 45 kV/mm

The rubber's dielectric strength is 2 to 2.5 times of the electric strength at 50 Hz.

Even though rubber is practically water and gas tight the electrical characteristics of it are influenced through moisture, particularly for rubbers compounded with significant quantities of the substances that increases the sensitivity to moisture. Only particularly compounded rubbers can preserve their electrical characteristics almost unchanged while kept continuously in contact with moisture. Generally employed like seals, gaskets and washers.

For standard rubbers the maximum operating temperature is generally 550C, for rubbers of great heat resistance the maximum operating temperature is 650C. For butyl rubbers the working temperature can be as higher as 900C. Rubbers have limited post resilience and at adequately low temperatures become brittle.

Silicon rubbers: silicon rubber comprises high electrical insulating properties, heat resistance, frost resistance, moisture resistance, also resistance to ozone and light. It can be generated as adhesive tapes [lined along with a layer of vulcanized rubber] appropriate for insulating the windings of high-voltage electrical machines. Those tapes as well work to insulate the terminal leads of electrical machines intended for high temperature rise. Silicon rubbers keep the flexibility of their temperature as low as -100C. One of their disadvantages is comparatively low mechanical strength, other is high cost.

Insulating fabrics: Base materials for insulating fabrics involve natural fibres like cellulose, cotton and silk; synthetic organic fibres of, for instance cellulose derivatives, polyamides [nylon], polyethylene tarepathalates; and inorganic fibres, mainly glass and asbestos. Non-woven synthetic organic fibres are generally bonded into a fabric through use of a bonding resin or through fusion. They locate electrical use mainly as a base for resin-impregnated insulation.

Unimpregnated woven fabrics locate a number of limited uses in electrical insulation. The electric strength of such type of fabrics usually does not exceed the breakdown strength of an equivalent air gap and indeed be less. Hence, their main use is to provide mechanical strength, abrasion resistance, and mechanical spacing of conductors in low voltage applications. Frequently the properties of such types of fabrics are upgraded through impregnation with a varnish after application. Better results are usually acquired if the fabric is impregnated prior to application.

Latest technology based Electrical Engineering Online Tutoring Assistance

Tutors, at the www.tutorsglobe.com, take pledge to provide full satisfaction and assurance in Rubber and Insulating Fabric homework help via online tutoring. Students are getting 100% satisfaction by online tutors across the globe. Here you can get homework help for Rubber and Insulating Fabric, project ideas and tutorials. We provide email based Rubber and Insulating Fabric homework help. You can join us to ask queries 24x7 with live, experienced and qualified online tutors specialized in Rubber and Insulating Fabric. Through Online Tutoring, you would be able to complete your homework or assignments at your home. Tutors at the TutorsGlobe are committed to provide the best quality online tutoring assistance for Electrical Engineering homework help and assignment help services. They use their experience, as they have solved thousands of the Electrical Engineering assignments, which may help you to solve your complex issues of Rubber and Insulating Fabric. TutorsGlobe assure for the best quality compliance to your homework. Compromise with quality is not in our dictionary. If we feel that we are not able to provide the homework help as per the deadline or given instruction by the student, we refund the money of the student without any delay.