TMS-811-1/AFJMAN
32-1080
Table 2-2. Diversity Factors. *
Diversity factors for
General
Large
Commercial
Elements of system between which diversity
Residence
lighting
lighting
power
users
factors are stated:
1.45
-
Between individual users. . . . . . . .
2.0
1.46
1.35
1.05
1.3
1.3
Between transformers. . . . . . . . . . .
Between feeders . . . . . . . . . . . . . . . .
1.15
1.15
1.15
1.05
1.1
1.1
Between substations . . . . . . . . . . . .
1.1
1.10
1.45
-
From users to transformer. . . . . . .
1.46
2.0
1.95
1.15
2.6
1.90
From users to feeder . . . . . . . . . . . .
2.24
1.32
3.0
2.18
From users to substation. . . . . . . .
2.46
1.45
3.29
2.40
From users to generating station
*From "Standard Handbook for Electrical Engineers" by Fink and Beaty, copyright 1987, by McGraw-Hill, Inc. Used with
permission of McGraw-Hill Book Company.
be higher than the 2.24 shown in figure 2-1 (lower
the maximum demand of the system. The diversity
than 0.45 demand). Diversity factor is defined as
of demands among transformers on a typical radial
feeder makes the actual maximum load on the
the ratio of the sum of the individual maximum
demands of various subsystems within a system to
feeder less than the sum of the transformer loads.
ELECTRIC DEMAND FLOW DIAGRAM
ELECTRIC DEMAND FLOW RELATIONSHIPSa
1.
Transformer I demand
- (User(A + B)demands) / (User diversity factor)
- [(A + B) / 1.45] - User loads / (1.45)
2.
Feeder 1 demand
- (Transformer I + II demands) / (Transformer diversity factor)
- ([(A + B) / 1.45] + [(C + D) / 1.451) / 1.35 - User loads /(1.95)
3.
Substation X demand
- (Feeder 1 + 2 demands) / (Feeder diversity factor)
- ([(Veer loads) /1.95] / 1.15) - User loads / (2.24)
4.
Generating plant demand - (Substation X + Y demands) /(Substation diversity factor)
- ([(User loads) /(2.24] / 1.10) - User loads /(2.46)
a
Figures used are from general power column of table 2-2.
US Army Corps of Engineers
Figure 2-1. Illustration of Diversity Factor Application.
2-2
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