power systems loss

What is the importance of vibration analysis in electric motors? Vibration characteristics and balancing Vibration is defined as a mechanical fluctuation from an equilibrium point. Vibration can also be considered as period vibration. Period vibration is a random vibration or pendulum motion of an object. An example of this is the movement of tires when moving on a gravel road.

What are the typical losses that occurs in electric motor operations? Energy losses in electric motors fall into four categories: Power losses (Stator and Rotor Losses) Magnetic core losses Friction and windage losses, and Stray load losses.

How can we estimate the distribution feeder loss using a single formula? The distribution system of an electric utility is a very complex system that is composed of many different kinds of electrical equipment. To mention a few of these components, this would include the feeder lines or wires which in reality are of different size and lengths, distribution transformers of different kVa rating capacity, low voltage lines, etc. 

What are the basic operating principles of relays in protecting electrical equipment? Overcurrent Relays Protection for electrical equipments can be found in many form. Overcurrent relays, perhaps the simplest of the many protective relays, close their contacts when the current flowing in the circuit or equipment reaches a predetermined value. The principle of operation of each of the several types is described below; the variations in their characteristics are illustrated by the curves in Figure 13.3.

Authored by: C.H. Lin, C. S. Chen, M. S. Kang, T.T. Ku, J.S. Huang, Z.S. Chiou, and C.W. Huang ABSTRACT --A systematic procedure is proposed to study the effect to temperature change to distribution feeder load profiles and losses by using the typical load patterns of customer classes. The database of an automated mapping/facility management (AM/FM) system is used to retrieve the component attributes and the topology process is executed to determine the electrical network configuration and the customers served by each distribution transformer.