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

5.1.2.1 Ungrounded system .............................................................................................................................14

5.1.2.2 Grounded system .................................................................................................................................14

5.1.2.3 High resistance-grounded system........................................................................................................14

5.1.3 Power interruption..................................................................................................................................14

5.1.3.1 Limited-break power source................................................................................................................14

5.1.3.2 No-break supply (uninterruptible power supply).................................................................................15

5.1.3.3 Power interruption, Type I, 60 Hz electric power system ...................................................................15

5.1.3.4 Power interruption, Types II and III electric power system ................................................................16

5.1.4 Phase sequence .......................................................................................................................................16

5.1.4.1 Phase angular relations ........................................................................................................................17

5.1.5 Electric power system protection............................................................................................................17

5.1.5.1 Type I, 60 Hz electric power system ...................................................................................................17

5.1.5.2 Type II, 400 Hz electric power system protection...............................................................................17

5.1.5.3 Type III, 400 Hz electric power system protection..............................................................................17

5.1.5.4 Conditions not protected against .........................................................................................................17

5.1.6 Electric power system parameters ..........................................................................................................17

5.1.6.1 System frequency ................................................................................................................................17

5.1.6.1.1 Type I, 60 Hz frequency transients...................................................................................................18

5.1.6.1.2 Type II, 400 Hz frequency transients................................................................................................19

5.1.6.1.3 Type III, 400 Hz frequency transients ..............................................................................................20

5.1.6.2 System voltage.....................................................................................................................................21

5.1.6.2.1 Type I, 60 Hz and Type II, 400 Hz power voltage transient.............................................................21

5.1.6.2.2 Type III, 400 Hz power transient voltage.........................................................................................24

5.1.6.2.3 Voltage spike characteristics ............................................................................................................25

5.1.6.3 System power factor (pf) .....................................................................................................................26

5.2 User equipment interface requirements .....................................................................................................26

5.2.1 Compatibility..........................................................................................................................................26

5.2.2 User equipment voltage..........................................................................................................................26

5.2.3 Emergency conditions ............................................................................................................................26

5.2.4 Grounding...............................................................................................................................................26

5.2.4.1 Human body leakage current limits for personnel safety ....................................................................26

5.2.4.1.1 Low frequency human body leakage current limits for personnel safety .........................................27

5.2.4.1.2 High frequency human body leakage current limits for personnel safety.........................................27

5.2.5 Current (load) unbalance ........................................................................................................................27

5.2.6 User equipment power factor .................................................................................................................27