MIL-HDBK-1004/5
Section 4: DESIGN ANALYSIS
4.1
General Requirements. Prior to final design, perform a design
analysis in accordance with criteria stated in this handbook. The design
analysis should also justify decisions that have been recommended in the
concept or in feasibility studies. Necessary material and computations that
are contained in the concept or studies are found in the body of the analysis
or in the appendix.
4.2
Scope. The design analysis shall completely cover the electrical
design requirements for 400-Hz electric power generation conversion and
distribution systems for the project and shall consist of two parts: (1) a
Basis for Design: and (2) Design Computations. In many cases, entire stations
can be served from one 400-Hz central plant. Include calculations of the
maximum length practicable for any component of the distribution system. In
addition, determine if the 400-Hz central plant capacity or voltage-drop
characteristics of the system, or both, indicate or warrant more than one
400-Hz central plant for that particular station.
4.3
Basis for Design. The basis for design serves as a concise outline
of functional features, including a description of any existing systems and
other considerations affecting the design. Provide a full description of all
special requirements and justification for any proposed departure from
standard criteria.
4.3.1
Type of System. Justify provision for a medium voltage and/or low-
voltage distribution system based on calculations of demand requirements. A
400-Hz load calculation is shown on Table 10. Aircraft loads are from Table
1; the aircraft demand factor is from Table 2; and the other values are those
customarily furnished by the using agency.
400-Hertz Conversion. Justify the size and number of frequency
4.3.2
conversion assemblies proposed and the reasons for selection of that
combination. Table 11 provides an example of how the number of frequency
conversion assemblies were chosen.
4.3.3
60-Hertz Input Power. Cover the electrical characteristics of the
input power supply for the 400-Hz system, including circuit interrupting
requirements and voltage regulation.
4.3.3 1
Adequacy. Make a statement
concerning the adequacy of the existing
60-Hz system at the point of take-off
to supply 400-Hz electric power
requirements. If the 60-Hz source is
inadequate, include the measures
proposed to correct the deficiency in
the statement.
4.3.3.2
Transformer Stations. To maintain the high reliability required,
provide two transformers. Determine the capacity of the proposed transformer
stations proposed to supply 400-Hz central plants. Following is an example of
a transformer station sizing.
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