Control power and ups configuration, 1 features, 2 bus & cpt – GE Industrial Solutions Entellisys 4.0 System User Manual User Manual
Page 209: 15 control power and ups configuration, 1 features 15.2 bus & cpt

Features
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15
15
Control power and UPS configuration
15.1 Features
Entellisys instrumentation and circuit breakers rely upon 120 Vac 50/60 Hz control power for
operation. An integral double-redundant, UPS-protected control power system provides a highly
reliable power source for the devices.
15.2 Bus & CPT
Control power transformers (CPTs) “A” and “B” typically connect to separate phases of the main
switchgear bus. In systems with more than one main bus, CPTs “A” and “B” connect to separate
main busses. The two power outputs (which are unsynchronized) are the sources for the two
redundant control power circuits throughout the switchgear.
CPTs transform bus voltage (240 Vac, 480 Vac, or 600 Vac) to 120 Vac 50/60 Hz.
CPTs are typically located in their own compartments. CPTs are co-located in non-split systems
when space allows, and they are always located in separate compartments in split systems.
Each CPT is rated at 5 kVA or more.
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