MIL-STD-704F
3.28 Transient. A transient is a changing value of a characteristic that usually occurs as a result of normal disturbances such as electric load change and engine speed change. A
transient may also occur as a result of a momentary power interruption or an abnormal disturbance such as fault clearing.
a. Transients that do not exceed the steady state limits are defined as lesser transients. b. Transients that exceed the steady state limits but remain within the specified normal
transients limits are defined as normal transients.
c. Transients that exceed normal transients limits as a result of an abnormal disturbance and eventually return to steady state limits are defined as abnormal transients.
3.29 Utilization equipment. Utilization equipment is that equipment which receives power from the electric power system.
3.30 Utilization equipment terminals. Utilization equipment terminals provide the interface with the electric power system. Power interconnections, within the utilization equipment or equipment system, are excluded.
3.31 Voltage modulation. Voltage modulation is the variation of AC voltage during steady state AC electric system operation. Sources of voltage modulation may include, but are not limited to, voltage regulation stability of the AC power source, generator speed variations, and load variations within utilization equipment. Voltage modulation amplitude is the difference between the maximum and minimum AC voltage values that occur in a one second period during steady state operating conditions.
3.32 Voltage phase difference. The voltage phase difference is the difference in electrical degrees between the fundamental components of any two-phase voltages taken at consecutive zero crossings traced in the negative to positive direction.
3.33 Voltage unbalance. Voltage unbalance is defined as the maximum difference between RMS phase voltage amplitudes at the utilization equipment terminals.
4. GENERAL REQUIREMENTS
4.1 Aircraft electric power system requirements.
4.1.1 Aircraft electric power system performance. The aircraft electric power system shall provide electric power having the characteristics specified in this standard at the utilization equipment terminals during all operations of the power system.
4.1.2 Electrical power source characteristics. The characteristics of the electrical power measured at the output terminals of an unregulated power source or the POR of a regulated
power source shall be within the limits specified in the applicable detail specification of the
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