# N

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## Nyquist criterion

The Nyquist criterion is a frequency domain tool which is used in the study of stability. To use this criterion, the frequency response data of a system must be presented as a polar plot in which the magnitude and the phase angle are expressed as a function of frequency.

## Nonlinear Resistance

The property exhibited by devices whose resistance does not change uniformly with changes in voltage or current.

## Neutron

A subatomic particle that is neither positively nor negatively charged and that has a mass approximately equal to that of a proton.

## Norton’s Theorem

Norton’s Theorem states that any linear network can be reduced to a simple parallel circuit whose resistance RN is in shunt with a current source IN.

## Nucleus

The center of an atom, containing proton (s) and neutron (s).

## Negative-sequence impedance

The quotient of that component of negative-sequence sinusoidal voltage that is due to the negative-sequence component of the current divided by the negative-sequence component of the current at the same frequency.

## Negative-sequence network

The equivalent representation of a power system constructed by using only the negative sequence impedances of the various components.

## Newton—Raphson method

An iterative technique for solving a set of non-linear equations (eg… the power ﬂow equations) by solving a succession of linearized equations to derive improvements to the latest estimate of the solution.

The saturation curve of a machine at no load.

A test applied to a machine on no load at rated voltage and frequency.

## Non-ideal or actual transformer

A transformer having winding resistance and leakage flux, and a magnetic core having ﬁnite permeability and core losses.

## Normally excited

The operating condition of a synchronous machine at Unity Power Factor.

## NEMA

National Electrical Manufacturers Association is a group who publishes electrical and medical imaging standards.

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