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-1399-300B

60                                                                                                                                                  450 or 120

50                                                                                        Quarter Load

On Generator

40

30

20

Half Load

On Generator

400 or 107

350 or 93

300 or 80

250 or 67

Full Load

On Generator

10                                                                                                                                                   200 or 53

0

0                          5                         10                       15                        20                        25

Time (Seconds)

FIGURE 8.  Voltage and frequency decay characteristics on loss of prime mover for typical steam turbine driven generator set, Type I, 60-Hz electric power system.

5.1.3.4  Power interruption, Types II and III electric power system.  Loss of input power to 601400 Hz motor generator (MG) sets will activate control circuits provided with MG sets which trip the MG circuit breaker.  This interrupts power to 400 Hz loads in a few milliseconds.  Upon loss of 60 Hz power to solid-state frequency changers, the 400 Hz power is interrupted within 2 msec by controls in the frequency changer.  Voltage and frequency monitors that are provided separately from conversion equipment controls, trip the MG 400 Hz output circuit breaker when the output voltage or frequency reach those values specified in 5.1.5.2 or 5.1.5.3 as applicable to the type power provided.

5.1.4  Phase sequence.  Standard phase sequence for three-phase AC systems in the U.S. Navy is in the following order: AB, BC, and CA.  For grounded systems, the phase sequence is AN, BN, CN.

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