INSULATING MEDIA
Insulating media in high voltage transformers consists of paper wrapped around the conductors in the transformer coils plus mineral oil…
-
-
THERMAL AND VOLTAGE CONSIDERATIONS OF PRACTICAL TRANSFORMER
THERMAL CONSIDERATIONS The losses in the windings and the core cause temperature rises in the materials. This is another important…
-
PERMANENT MAGNET DC MOTOR
A permanent magnet dc motor (PMDC) is a dc motor whose poles are made of permanent magnets. PMDC motor offer…
-
THREE PHASE TRANSFORMER WINDING CONNECTIONS
1) DELTA DELTA CONNECTION 1. Suitable for both un-grounded and effectively grounded sources. 2. Suitable for a three-wire service or…
-
GOALS OF SYSTEM DESIGN
When considering the design of an electrical distribution system for a given customer and facility, the electrical engineer must consider…
-
FAULT PROTECTION DEVICES
Fuses are designed to melt and disconnect the circuit within which they are placed should the current in the circuit…
-
THE NEED FOR GROUNDING
The Institute of Electrical and Electronics Engineers (IEEE) defines grounding as a conducting connection, whether intentional or accidental, by which…
-
GROUNDING ELECTRODE
The process of connecting the grounding system to earth is called earthing and consists of immersing a metal electrode or…
-
EARTH ELECTRODE
Earth electrodes may be made electrodes, natural electrodes, or special-purpose electrodes. Made electrodes include driven rods, buried conductors, ground mats,…
-
GROUNDING ON BARE ROCK
A bare rock mountaintop location provides special challenges to the facility design engineer. There is no soil, thus there are…