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GE H
EALTHCARE
D
5141177-100, R
IRECTION
EVISION
Section 3.0
Recommended Power Distribution System
A dedicated feeder run from the facility main isolation transformer is recommended to power the
BrightSpeed CT scanner. If the scanner must be powered from an existing distribution transformer
and secondary feeder, such as the equipment distribution panel of an X-ray department, installation
with other X-Ray equipment that use rapid film changers should be avoided. These changers use
a large number of high powered, closely spaced exposures, which may coincide with the CT scan
and produce image artifacts.
If a dedicated distribution transformer is provided for the scanner, the minimum recommended
transformer size is 112.5 kVA, rated 2.4% regulation at unity power factor. For this configuration,
the minimum recommended feeder size and overcurrent protection device based on line voltage is
shown in
In all cases, qualified personnel must verify that the transformer and feeder, at point of take-off, plus
the run to the BrightSpeed CT scanner meet all the requirements stated in this document.
SYSTEM CHARACTERISTICS:
Note:
(xxx):The value in the brackets is for 75kVA.
•
•
•
•
The nominal line voltage must fall within one of the ranges listed below
Nominal Line Voltage
Hi-Line Limit, +10%
Lo-Line Limit, -10%
Continuous Line Current
Momentary Line Current
Maximum Line Current
Minimum Recommended
Circuit Protection Rating
Table 8-1 Nominal Line Voltage
Page 130
14
IF THE POWER FEED FOR THE A1/PDB PANEL IS NOT ON A DEDICATED
POWER TRANSFORMER ANY DEVICE THAT SHARES POWER FROM THAT
TRANSFORMER MAY BE IMPACTED BY INADVERTENT POWER
INTERUPTION CAUSED BY AN A1/PDB POWER PANEL FAULT.
CONVERSLY, THE OPERATION OF OTHER DEVICES SHARING THE POWER
TRANSFORMER MAY ALSO IMPACT THE OPERATION OF THE CT/PET
SCANNER.
Table 8-2
Minimum Feeder Wire Size.
Maximum power demand = 90kVA
380 mA (300mA).
Continuous (average) power demand at maximum duty cycle = 20kVA (16.7kVA).
Maximum allowable total source regulation is 6%.
Minimum recommended transformer size: 112.5 kVA (93.75kVA), with 2.4% rated regulation
at unity power factor. Resultant maximum allowable feeder regulation is 3.4%.
200
220
180
58
260
289
150
Section 3.0 - Recommended Power Distribution System
B
S
RIGHT
PEED
WARNING
(75kVA)
@ 0.85 PF: at a Selected Technique of 140 kV,
220
240
380
400
242
264
418
440
198
216
342
360
52
48
30
29
236
217
137
130
262
241
152
144
150
150
110
110
E
, E
, E
: P
-I
LITE
DGE
XCEL
RE
NSTALLATION
420
440
460
462
484
506
378
396
414
27
26
25
124
118
113
137
131
126
100
100
90
480
528
432
24
108
120
90
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