Dictionary of Electrical Engineering

Commonly used terms in the Electrical industry.

secondary
(1) the load-side winding.

(2) refers to the portion of a nuclear power plant containing non-radioactive components such as turbines and generators.
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 resistor
a resistor connected to the rotor of a wound-rotor induction machine to permit variation of the effective rotor resistance. By varying the resistance, machine characteristics may be optimized for starting or varying load conditions.
secondary selective service
a redundant electric service in a critical load is supplied by two distribution transformers, each of which is served by a separate, independent distribution primary circuit.
secondary system of equations
a system of algebraic and differential equations obtained from the primary system of equations by transformation of network variables.
secondary voltage
in power distribution work the voltage at the secondary of the distribution transformer.
secondary voltage control
an automatic voltage control scheme that is similar in function to the automatic voltage regulator, but its purpose is to control a bus voltage which need not have a synchronous generator connected at the bus.
secondary
winding the transformer winding to which the loads are connected.
See primary winding
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