Breakdown Voltage Of Air Per Cm
30 000v cm 9 000v per n centimeters. At ten millimeters per centimeter you ll have 1 centimeter.
Vb 20 3 kv.
Breakdown voltage of air per cm. So if you want to cause breakdown in the air gap between flat metal plates and you have exactly 9 000vdc then the plates would have to be 0 3cm apart in order to produce 30kv cm field strength. N 9000v 30000v cm 0 3cm. Multiply 1 by 30 000 to get 3 000 volts.
This is only as a rough guide since the actual breakdown voltage is highly dependent upon the electrode shape and size. Therefore electrical breakdown characteristic of small air gap under the different applied voltage has its great significance for the design consideration of various air insulated hv equipment. Measurement of air breakdown voltage and electric field.
Key in the number of centimeters into the calculator. At 760 torr and 293 k. In united states customary units dielectric strength is often specified in volts per mil a mil is 1 1000 inch.
For example if you measure 1 millimeter first convert to centimeters. There are other factors that influence the breakdown voltage in air e g humidity thickness and temperature hence the wide range. The dielectric breakdown strength of dry air at standard temperature and pressure stp between spherical electrodes is approximately 33 kv cm.
Press the multiply key. This is the usually quoted breakdown strength of air at room temperature and at atmospheric pressure. The result is the voltage required to produce a spark in the gap.
1 v m 2 54 10 5 v mil 1 v mil 3 94 10 4 v m. Press the equals key. Normally air medium is widely use as an insulating medium in different electrical power equipments as its breakdown strength is 30 kv cm.
It is also common to see related units such as volts per centimeter v cm megavolts per meter mv m and so on. This equation yields a limiting value for e of 24 kv cm for long gaps and a value of 30 kv cm for 293 pd 760t 1 which means a pressure of 760 torr at 20 c with 1 cm gap. From engineering and physical tables the typical range for the breakdown voltage in air is expected to be 20 kv to 75 kv.
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