6
2006 by Taylor & Francis Group, LLC.
Thermal Generating
Plants
Kenneth H. Sebra
Baltimore Gas and Electric Company
6.1
Plant Auxiliary System...................................................... 6-2
Selection of Auxiliary System Voltages . Auxiliary System
Loads . Auxiliary System Power Sources . Auxiliary System
Voltage Regulation Requirements
6.2
Plant One-Line Diagram .................................................. 6-3
6.3
Plant Equipment Voltage Ratings .................................... 6-3
6.4
Grounded vs. Ungrounded Systems ................................ 6-3
Ungrounded . Grounded . Low-Resistance Grounding .
High-Resistance Grounding
6.5
Miscellaneous Circuits ...................................................... 6-3
Essential Services . Lighting Supply
6.6
DC Systems ........................................................................ 6-4
125-V DC . 250-V DC
6.7
Power Plant Switchgear .................................................... 6-4
High-Voltage Circuit Breakers . Medium-Voltage Switchgear .
Low-Voltage Switchgear . Motor Control Centers .
Circuit Interruption
6.8
Auxiliary Transformers ..................................................... 6-5
Selection of Percent Impedance . Rating of Voltage Taps
6.9
Motors ................................................................................ 6-6
Selection of Motors . Types of Motors
6.10 Main Generator ................................................................. 6-6
Associated Equipment . Electronic Exciters . Generator
Neutral Grounding . Isolated Phase Bus
6.11 Cable................................................................................... 6-7
6.12 Electrical Analysis .............................................................. 6-7
Load Flow . Short-Circuit Analysis . Surge Protection .
Phasing . Relay Coordination Studies
6.13 Maintenance and Testing.................................................. 6-8
6.14 Start-Up.............................................................................. 6-8
Thermal genera