Dictionary of Electrical Engineering

Commonly used terms in the Electrical industry.

radial system
a network of straight wires or other conductors radiating from the base of a vertical monopole antenna that simulates the presence of a highly conducting ground plane beneath the antenna. Typically, radial wires are approximately a quarter wavelength long and are arranged to have equiangular spacing between them. The radial wire ends at the base of the monopole are electrically bonded together and to one conductor of the feedline.
low resistance grounded system
an electrical distribution system in which the neutral is intentionally grounded through a low resistance.

Low resistance grounding will limit ground fault current to a value that significantly reduces arcing damage but still permits automatic detection and interruption of the fault current.
rotating excitation system
an excitation system derived from rotating AC or DC machines. The output of the system is still DC and connected to the rotor.
safety-critical system
a system that is intended to handle rare unexpected, dangerous events.
secondary distribution system
a distribution system in which a significant the subdivision of power to customers is done on the secondary, or low-voltage side of the distribution transformer, as opposed to the practice of assigning a small distribution transformer to each customer or small group of customers.
secondary system of equations
a system of algebraic and differential equations obtained from the primary system of equations by transformation of network variables.
single machine infinite bus system
a model of a power system consisting of a single generator working into an infinite bus which represents the remainder of the system.
solidly grounded system
a grounding scheme in which the neutral wire of a power system is connected to ground at frequent intervals so as to minimize the impedance between neutral and ground.
static excitation system
an excitation system derived from solid state devices such as thyristors that convert the AC terminal voltage to DC before application to the rotor.
system
a physical process or device that transforms an input signal to an output signal.
systems engineering
an approach to the overall life cycle evolution of a product or system. Generally, the systems engineering process comprises a number of phases. There are three essential phases in any systems engineering life cycle: formulation of requirements and specifications, design and development of the system or product, and deployment of the system. Each of these three basic phases may be further expanded into a larger number. For example, deployment generally comprises operational test and evaluation, maintenance over an extended operational life of the system, and modification
and retrofit (or replacement) to meet new and evolving user needs.
unforced system
a dynamic system where all of the external sources of excitation are identically zero.
ungrounded system
an electrical distribution system in which there is no intentional connection between a current-carrying conductor and ground.
Flexible Alternating Current Transmission System

A static equipment used for the AC transmission of electrical energy. It is meant to enhance controllability and increase power transfer capability. It is generally a power electronics based device.


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