From Omni Controls, Inc.
Every electric wire in your plant - whether it's in a motor, generator, cable, switch, transformer, etc. - is carefully covered with some form of electrical insulation. The wire itself is usually copper or aluminum, which is known to be a good conductor of the electric current that powers your equipment. The insulation must be just the opposite from a conductor: it should resist current and keep the current in its path along the conductor.
To understand insulation testing you really don't need to go into the mathematics of electricity, but one simple equation - Ohm's law - can be very helpful in appreciating many aspects. Even if you've been exposed to this law before, it may be a good idea to review it in the light of insulation testing.
The purpose of insulation around a conductor is much like that of a pipe carrying water, and Ohm's law of electricity can be more easily understood by a comparison with water flow. In Fig. 1 we show this comparison.
Product Announcements
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Megger introduces the new family of 5 and 10 kV insulation testers comprised of three analog/digital models.
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Saint-Gobain Performance NORTON® Films and Tapes are used in high performance applications in the Energy Oil and Gas industry, including electrical insulation for electrical submersible pumps,...
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These small diameter high temperature lead wires allow unique constructions.The basic wire conforms to MIL-W-3861 stranded Nickel plated copper. When shielded, pure Nickel shielding per MIL-N-46026A.
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Topics of Interest
13.1 ELECTRICAL CURRENT AND OHM's LAW
Electrical current I is defined as the total charge that flows through a conductor per unit time or
(13.1)
The SI unit of current is the Ampere...
Overview
When the current flow path is directed correctly, the pressure of the source voltage forces normal current magnitudes to flow through the load impedances. During this time, the insulation...
In This Chapter
Electrical Current and Ohm’s Law
Kirchhoff ’s Laws
Resistances in Parallel and Series
Capacitances in Parallel and Series
Impedances in AC Circuits
Transient Currents in...
ELECTRICAL CONDUCTING WIRES AND CABLES
1. Electrical conducting wires and cables are available in a great variety of types and forms of construction. To cover this one subject completely would...
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