Metallised paper capacitors, Physics

One side of impregnated paper capacitors is sprayed with metal.  When such paper is rolled, its gives higher capacitance for a given value. This capacitor has a self healing property, if the voltage across the capacitor is gradually raised to a value at which sparking occurs, the voltage is held constant at this value, and then the sparking is only momentary. This sparking at week points in paper and thin metal film evaporates from these spots without damaging the paper. Aluminium at high temperatures produces aluminium oxide, which is a good insulator. Aluminium is evaporated on lacquered paper tissue in vacuum. Thickness of film is small. Metallised tissue is passed between metal rollers, across which working voltage is applied to remove week points. Two such tissues are superimposed and wound to form a roll. The demutualised margin serves as insulator between the two electrodes. Both the ends are sprayed with copper so that end connections can be made.

SPECIFICATIONS

Range of values                                  1000 Pf to 1 μF

Tolerances                                                                          25%

Voltage rating up to                                                             1.5 KV

Power factor at 1K Hz                               0.05

Stability                                                                              5 to 10%

Temperature coefficient                                 + 150 to 200 ppm/0C

APPLICATIONS: It is used for decoupling.

Posted Date: 7/9/2012 6:37:12 AM | Location : United States







Related Discussions:- Metallised paper capacitors, Assignment Help, Ask Question on Metallised paper capacitors, Get Answer, Expert's Help, Metallised paper capacitors Discussions

Write discussion on Metallised paper capacitors
Your posts are moderated
Related Questions
An electrical dipole is just a separation between a negative and positive charge of the same magnitude. Consider that a dielectric material is exposed to an electrical field. The e

Name the device used for data transmission from single computer to an other Justify the name. Using this device draw the block diagram for data Communication and define it brief

Hi, Good day. I enjoy watching your physics videos, but I have a question and was wondering if you can answer it for me showing the working. the question is as follows: A flat truc

what is inertial

Basic principles of spectrophotometry: An absorbance spectrophotometer is an instrument that measures the fraction of the incident light transmitted through a solution

Q. In Young's double slit experiment the distance between the slits is 1.9 mm. The distance between the slit and the screen is 1 m. If the bandwidth is 0.35 mm Compute the waveleng

CELL EMF: The size of a cell has no bearing on the emf that it will produce, the generated emf being determined solely by the materials used in its construction. Another point

State Triangle Law & Derive

Take the difference among your experimental value and your known value, and divide that difference by your know value. Say you experimentally found the force of gravity to be 8m/s

Q. In Young's double slit experiment, the width of the fringe obtained with light of wavelength 60000A is 2 mm. Calculate the fringe width if the entire apparatus is immersed in a