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-1399-3008

CONTENTS

PARAGRAPH                                                                                                                                                         PAGE

3.4.7  Voltage waveform ....................................................................................................................................9

3.4.7.1  Voltage single harmonic........................................................................................................................9

3.4.7.2  Voltage single harmonic content ...........................................................................................................9

3.4.7.3  Voltage total harmonic distortion (THD) ..............................................................................................9

3.4.7.4  Voltage deviation factor ........................................................................................................................9

3.5  Current.......................................................................................................................................................10

3.5.1  Current unbalance...................................................................................................................................10

3.5.2  Current waveform...................................................................................................................................10

3.5.2.1  Current single harmonic ......................................................................................................................10

3.5.2.2  Current single harmonic content..........................................................................................................10

3.5.3  Surge/inrush current ...............................................................................................................................10

3.6  Power factor (pf)........................................................................................................................................11

3.6.1  Displacement power factor (dpf)............................................................................................................11

3.6.2  Distortion component (μ) of power factor..............................................................................................11

3.7  Power.........................................................................................................................................................11

3.7.1  Real power..............................................................................................................................................11

3.7.2  Reactive power .......................................................................................................................................11

3.7.3  Apparent power ......................................................................................................................................11

3.8  Pulse ..........................................................................................................................................................11

3.9  Pulsed load ................................................................................................................................................12

3.10  Ramp load................................................................................................................................................12

3.11  User equipment........................................................................................................................................12

3.12  Emergency condition...............................................................................................................................12

3.13  Limited-break power source....................................................................................................................12

4.  GENERAL REQUIREMENTS..........................................................................................................................12

4.1  Interface requirements ...............................................................................................................................12

4.2  Conformance test requirements .................................................................................................................12

4.3  User equipment..........................................................................................................................................12

4.4  Deviations..................................................................................................................................................12

5.  DETAILED REQUIREMENTS.........................................................................................................................12

5.1  Electric power system characteristics........................................................................................................12

5.1.1  Types of power.......................................................................................................................................14

5.1.1.1  Type I, 60 Hz power............................................................................................................................14

5.1.1.2  Types II and III, 400 Hz power ...........................................................................................................14

5.1.2  System grounding...................................................................................................................................14

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