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AMSC/NA FSC 1990

METRIC

MIL-STD-1399(NAVY)

SECTION 300B

24 APRIL 2008

SUPERSEDING

MIL-STD-1399(NAVY)

SECTION 300A(1)

11 MARCH 1992

DEPARTMENT OF DEFENSE

INTERFACE STANDARD

SECTION 300B

ELECTRIC POWER, ALTERNATING CURRENT

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MIL-STD-1399-300B

FOREWORD

1. Preamble

. This military standard is approved for use by the Department of the Navy and is available for use

by all Departments and Agencies of the Department of Defense.

2. Purpose

. This section defines the standard interface requirements for and the constraints on the design of

shipboard user equipment that will utilize shipboard alternating current (AC) electric power.

3. Nature of the interface

. In any system involving power source, distribution network, and load (user

equipment), the characteristics at the system and user equipment interface are mutually dependent on the design and

operation of both. In order for the electric power system to perform within the established tolerances, it is necessary

to place constraints on the power source, the distribution system, and the user equipment. This interface standard

defines the electric power system characteristics. User equipment constraints are also established.

4. Structure

. The technical content first delineates the characteristics of the shipboard electric power system at

the interface in terms of voltage, frequency, continuity, and voltage waveform. Constraints on user equipment

design and installation, which are necessary to achieve shipboard compatibility with and to assure these

characteristics, are then established. Finally, test requirements are specified to verify conformance of user

equipment to this standard.

5. Invoking the standard

. The Principal Development Activity (PDA) will consider the mission requirement of

the user equipment being developed or acquisitioned. The PDA will then select those conditions under which the

user equipment is to operate and those conditions, which the user equipment will withstand without failure, but not

necessarily, operate normally. The PDA will also specify those tests commensurate with the equipment’s mission,

which will ensure the user equipment’s satisfactory operation, the user equipment’s compatibility with the shipboard

electric power system and other equipment, and the equipment’s survival.

6. NATO coordination and standardization

. The standard characteristics of AC electric power supplied for

U.S. Navy ships have been coordinated with NATO standardization documentation, where applicable. In particular,

the standard characteristics of Type I and Type II power conform to corresponding power types specified in

STANAG 1008 (Edition Number 8).

7. Numerical quantities

. Numerical quantities are expressed in metric (SI) units.

8. Contact information

. Comments, suggestions, or questions on this document should be addressed to

Commander, Naval Sea Systems Command, ATTN: SEA 05M2, 1333 Isaac Hull Avenue, SE, Stop 5160, Washington

Navy Yard DC 20376-5160 or emailed to

commandstandards@navy.mil, with the subject line “Document Comment”.

Since contact information can change, you may want to verify the currency of this address information using the

ASSIST Online database at

http://assist.daps.dla.mil.

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MIL-STD-1399-300B

CONTENTS

PARAGRAPH

PAGE

1. SCOPE..................................................................................................................................................................1

1.1 Scope ...........................................................................................................................................................1

1.2 Classification ...............................................................................................................................................1

1.2.1 Special power classification for avionic shops and aircraft servicing ......................................................1

1.2.2 Special power classification for NATO load equipment ..........................................................................1

1.2.3 Special non-standard power......................................................................................................................1

1.3 Electrical interface.......................................................................................................................................1

2. APPLICABLE DOCUMENTS ............................................................................................................................3

2.1 General ........................................................................................................................................................3

2.2 Government documents...............................................................................................................................3

2.2.1 Specifications, standards, and handbooks.................................................................................................3

2.2.2 Other Government documents, drawings, and publications .....................................................................3

2.3 Order of precedence ....................................................................................................................................3

3. DEFINITIONS .....................................................................................................................................................4

3.1 Electric power system..................................................................................................................................4

3.2 Electric power system ground .....................................................................................................................4

3.2.1 Ungrounded electric power system ..........................................................................................................4

3.2.2 High resistance-grounded electric power system .....................................................................................4

3.3 Frequency ....................................................................................................................................................4

3.3.1 Nominal frequency ...................................................................................................................................4

3.3.2 Frequency tolerance..................................................................................................................................4

3.3.3 Frequency modulation..............................................................................................................................4

3.3.4 Frequency transients.................................................................................................................................5

3.3.4.1 Frequency transient tolerance................................................................................................................5

3.3.4.2 Frequency transient recovery time.........................................................................................................5

3.4 Voltage ........................................................................................................................................................5

3.4.1 Nominal user voltage................................................................................................................................5

3.4.2 User voltage tolerance .............................................................................................................................. 5

3.4.3 Voltage unbalance (line-to-line)...............................................................................................................6

3.4.4 Voltage modulation (amplitude)...............................................................................................................6

3.4.5 Voltage transients .....................................................................................................................................7

3.4.5.1 Voltage transient tolerance ....................................................................................................................7

3.4.5.2 Voltage transient recovery time.............................................................................................................7

3.4.6 Voltage spike............................................................................................................................................7

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MIL-STD-1399-300B

iii

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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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

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