MIL-STD-1399-300 Electric Power, Alternating CurrentThis military standard section establishes electrical interface characteristics for shipboard equipment utilizing AC electric power to ensure compatibility between user equipment and the electric power system. Characteristics of the electric power system are defined and tolerances are established, as well as requirements and test methods for ensuring compatibility of shipboard user equipment with the power system. The policies and procedures established by MIL-STD-1399 are mandatory. This section and the basic standard are to be viewed as an integral single document for use in the design and testing of electric power systems and user equipment.

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MIL-STD-1399-3OO8

3.4.7  Voltage waveform.  The voltage waveform is a voltage vs. time function.

3.4.7.1  Voltage single harmonic.  A voltage single harmonic is a sinusoidal component of the voltage's periodic waveform having a frequency that is an integral multiple of the fundamental frequency.

3.4.7.2  Voltage single harmonic content.  The voltage single harmonic content of a voltage wave is the ratio, in percentage, of the rms value of that harmonic to the rms value of the fundamental.

3.4.7.3  Voltage total harmonic distortion (THD).  Total harmonic distortion of a voltage wave is the ratio in percentage of the rms value of the residue (after elimination of the fundamental) to the rms value of the fundamental, calculated by Equation 6.

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2

(      V       l

Voltage THD (percent) =

x   ∑1      h           1

Where:

h≠1 ⎝ Vfundamental  ⎠

Vh  is the voltage of individual harmonics h ≥ 2

Vfundamental  is the voltage at 6O Hertz

EQUATION 6

3.4.7.4  Voltage deviation factor.  The voltage deviation factor of the voltage waveform is the ratio (alb) where "a" is the maximum deviation between corresponding ordinates of the waveform and of the equivalent sine wave and "b" is the maximum ordinate of the equivalent sine wave when the waveforms are superimposed in such a way that they make the maximum difference as small as possible.  This is calculated by Equation 7 and shown in Figure

7.  NOTE:  The equivalent sine wave is defined as having the same frequency and the same rms voltage as the waveform being tested.

(                                                          l

1                      Maximum deviation                      1x

Voltage deviation factor (percent) = ⎝ Maximum ordinate of the equivalent sine wave ⎠

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EQUATION 7

9

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