Pacific Power Source UPC-3 - Page 53

SECTION 4 OPERATION
41
4.4.2.1 MIL-STD-704D TRANSIENT PROGRAMS (cont)
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. (Nominal Steady-State Value)
V
a
, V
b
, V
c
= 124 VAC (High-Line Steady-State Limit)
WFa=1, WFb=1, 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. (Nominal Steady-State Value)
V
a
, V
b
, V
c
= 108 VAC (Low-Line Steady-State Limit)
WFa=1, WFb=1, 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.