SECTION 4 OPERATION
38
4.4.2.1 MIL-STD-704D TRANSIENT PROGRAMS
Sample Programs and Transient events are provided in the UPC which are capable of producing the Voltage
and Frequency excursions required by MIL-STD-704D. Programs 100-103 are permanent, pre-stored, non-
executable transient programs. These permanent programs may be copied to any of programs 1 - 99 for
execution. To copy programs see (4.6.1.1).
Program 100 is a MIL-STD-704D over-voltage transient.
Program 101 is a MIL-STD-704D under-voltage transient.
Program 102 is a MIL-STD-704D over-frequency transient.
Program 103 is a MIL-STD-704D under-frequency transient.
The four voltage and frequency programs are for equipment which is nominally powered by 115/200 volts
and a Frequency of 400 Hz. Transient program data, as stated for over/under voltage and over/under
frequency tests as specified by paragraph 5.2.3 of MIL-STD-704D, is provided in the following paragraphs.
The data presented in this section is based on MIL-STD-704D dated 30 SEP 1980.
NOTE: All four transients described are single event, 3 phase transients.
OVER-VOLTAGE TRANSIENT (Program #100)
The power source will produce the over-voltage transient excursion as defined by MIL-STD-704D
(Paragraph 5.2.3.2.1). The power source must be configured for a voltage range of at least 180Vrms to
perform this test.
INITIAL CONDITIONS:
f
o:
400 Hz.
V
a
, V
b
, V
c:
124 VAC
(High-Line Steady-State)
WFa, WFb, WFc: 1
XFMR COUPLED: XFMR RATIO=1.5 (or higher)
TRANSIENT COMMAND SEQUENCE:
Segment 1: F=400 Hz. Va=180, Vb=180, Vc=180, T=0.0002
Segment 2: F=400, Va=180, Vb=180, Vc=180, T=0.01
Segment 3: F=400, Va=124, Vb=124, Vc=124, T=0.07
UNDER-VOLTAGE TRANSIENT (Program #101)
The power source will produce the under-voltage transient excursion as defined by MIL-STD-704D
(Paragraph 5.2.3.2.1). The power source must be configured for a voltage range of at least 108Vrms to
perform this test.
INITIAL CONDITIONS:
f
o:
400 Hz.
V
a
, V
b
, V
c:
108 VAC
(Low-Line Steady-State)
WFa, WFb, WFc: 1
DIRECT COUPLED
TRANSIENT COMMAND SEQUENCE:
Segment 1: F=400 Hz. Va=80, Vb=80, Vc=80, T=0.0002
Segment 2: F=400, Va=80, Vb=80, Vc=80, T=0.01
Segment 3: F=400, Va=108, Vb=108, Vc=108, T=0.07
NOTE: The above transient commands are stated for the transient voltage excursion to occur on all phases,
simultaneously. MIL-STD-704D allows for the transient to occur on a single phase or on any combination of
phases. To exclude a phase from the transient excursion, simply change the appropriate Va, Vb or Vc field
in Segment 1 and 2 to remain the same as the steady-state value.
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