Coordination study for data Center: Results and
Recommendations
1.1Coordination Study
The purpose of this coordination study is to determine the proper settings for overcurrent
protective devices in the power system.
In order to determine the proper setting for the Overcurrent protective devices they are
plotted on time-current curve graphs (TCCs). The time-current characteristics of properly
coordinated devices will not overlap on a TCC graph. An example of a TCC graph is shown in
Fig. 1.
Fig1
Recommendation:
The coordination of parallel generators can pose a challenge. It is not uncommon for the feeder
breakers in generator paralleling switchgear to have a similar long time trip rating as the generator
breakers so I suggest that G1,G2,G output generator breaker curves can be shifted to the right by a
factor of three
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