MIL-HDBK-1004/5
For medium-voltage systems, the voltage level on the input to the
utilization service assembly defines the setting for its line drop
compensator. Indicate compensator settings on the drawings so correct
aircraft voltage levels are provided. An example of a line drop compensator
setting is given in Section 4. Overcompensation can cause the sending-end
impedance to appear very low and result in a current flow that can raise the
voltage level above the required 118 volts. Set the compensator so that the
limits of 113 volts minimum at full-load and 118 volts maximum at no-load at
the aircraft interface point is not compromised under any circumstance.
3.4.3
Feeder Cable Connection. Once the location of all utilization
service assemblies is determined, calculate the allowable number of such
devices which can be connected to a medium-voltage feeder cable. See Section
4 for an example of a calculation.
3.4.4
Cable Design Requirements. Cable for 400-Hz circuits requires a
design which minimizes voltage drop by its construction. The cable parameters
for feeder and service cable are given in Table 5. To provide standardized
design, design aircraft cable to meet requirements in MIL-STD-90328, Cable
Assembly External Electric Power. Aircraft 115/200-Volt, 400-Hz. Complete
requirements for cable design are covered in NFGS-16305, 400-Hz Low-Voltage
Substation.
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