Page 143 - Power Quality in Electrical Systems

Methods for Correction of Power-Quality Problems 125

Pure
Leakage
path
Leakage
paths
Gaps

(a) (b)

Leakage path
Leakage
paths

(c) (d)
Figure 8.16 Leakage-reactance transformer core construction:
(a) bar shunt; (b) X core; (c) single leakage core; and (d) double leak-
age core [8.14].

such as computers, these centers require power for supporting func-
tions like air conditioning, lighting, heat exchanging, living facilities,
and maintenance. The support is usually provided by E/G sets or alter-
nate utility feeders. The centers must also be designed so equipment

Normal utility source

Engine-generator

G
Main
CB
Main bus

Non-emerg. Emerg. Gen.
CB CB CB

Transfer
To non-emergency
load switch

To emergency load
Figure 8.17 A standby system with engine generator and transfer
switch [8.10].