"美军接口标准MIL-STD-704F：飞机电源特性综述"
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The MIL-STD-704F is a Department of Defense interface standard for aircraft electric power characteristics. It was released on 12th March 2004 and supersedes the previous version, MIL-STD-704E1 from May 1991. The purpose of this standard is to ensure compatibility between the aircraft electric system, external power sources, and airborne utilization equipment.
The standard covers a wide range of technical specifications and requirements to guarantee that aircraft electrical systems operate effectively and safely. It is crucial for maintaining the reliability and performance of military aircraft and their mission-critical electrical systems.
All Departments and Agencies of the Department of Defense are required to follow this standard to ensure uniformity and compatibility across different aircraft and equipment. Any comments, suggestions, or questions regarding the standard are welcomed to ensure continuous improvement and effectiveness in the aerospace industry.
Overall, MIL-STD-704F plays a vital role in maintaining the integrity and interoperability of aircraft electrical systems, ultimately enhancing the overall operational efficiency and safety of military aircraft. Its comprehensive guidelines and regulations serve as a cornerstone for ensuring reliable and consistent performance in the field of aerospace technology.
MIL-STD-704F
f.
NATO
g.
POR
h.
RMS
i.
STANAG
j.
VA
North
Atlantic
Treaty
Organization
Point
of
Regulation
Root
Mean
Square
Standardization
Agreement
Volt-ampere
3.2
Abnomial
opeTation
.
Abnormal
operation
occurs
when
a
malfunction
or
failure
in
the
electric
system
has
taken
place
and
the
protective
devices
of
the
system
are
operating
to
remove
the
malfunction
or
failure
from
the
remainder
of
the
system
before
the
limits
for
abnormal
operation
are
exceeded.
The
power
source
may
operate
in
a
degraded
mode
on
a
continuous
basis
where
the
power
characteristics
supplied
to
the
utilization
equipment
exceed
normal
operation
limits
but
remain
within
the
limits
for
abnormal
operation.
3.3
AC
voltage
.
AC
voltage
is
the
root
mean
square
(RMS)
phase
to
neutral
value
for
each
half
cycle.
a.
Steady
state
AC
voltage
is
the
time
average
of
the
RMS
voltage
over
a
period
not
to
exceed
one
second.
b.
Peak
AC
voltage
is
the
maximum
absolute
value
of
the
instantaneous
voltage.
c.
The
direct
current
(DC)
component
of
the
AC
voltage
is
the
average
value
of
the
voltage.
3.4
Aircraft
electric
power
systems
.
An
aircraft
electric
power
system
consists
of
a
main
power
source,
emergency
power
source,
power
conversion
equipment,
control
and
protection
devices,
and
an
interconnection
network
(wires,
cables,
connectors,
etc.).
The
main
power
is
derived
from
aircraft
generators
driven
by
the
aircraft
propulsion
engines.
Emergency
power
is
derived
from
batteries,
engine
bleed
air,
independent
auxiliary
power
units,
ram
air
driven
generators,
or
hydraulically
driven
generators.
3.5
Crest
factor
.
The
crest
factor
is
the
absolute
value
of
the
ratio
of
the
peak
to
the
RMS
value
for
each
half
cycle
of
the
voltage
waveform.
3.6
Current
.
Alternating
Current
(AC)
current
is
the
RMS
value
for
one
half
cycle
measured
between
consecutive
zero
crossings
of
the
fundamental
frequency
component.
Direct
Current
(DC)
current
is
the
instantaneous
value.
3.7
Current
modulation
.
Current
modulation
is
the
difference
between
maximum
current
and
minimum
current.
Percent
current
modulation
is
the
ratio
of
the
current
modulation
to
the
average
(mean
for
DC,
RMS
of
the
fundamental
for
AC)
current
multiplied
by
100
over
a
one
second
period.
3.8
DC
voltage
.
Steady
state
DC
voltage
is
the
time
average
of
the
instantaneous
DC
voltage
over
a
period
not
to
exceed
one
second.
2
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