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PBMR Electrical Systems

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PBMR Electrical Systems ElectricalElectrical SystemsSystems Karl Fleming 1 Electric Power Systems The PBMR Electrical System consists of the: ¾ Main Electrical Power System (MEPS) ¾ Auxiliary Electrical Power System (AEPS) February 28 – March 2, 2006 PBMR Safety and Design Familiarization 2 © Copyright 2006 by PBMR (Pty) Ltd. MEPS Functions • Converts the generator output to the network voltage and transmits the power to the network • Accelerates the power turbine generator to synchronous speed during plant starting • Protects the main power generator and the components of the electrical system by disconnecting these components in the event of an electrical fault • Measures the electrical power flowing into and out of the generator and the plant February 28 – March 2, 2006 PBMR Safety and Design Familiarization 3 © Copyright 2006 by PBMR (Pty) Ltd. Normal AC Power Sources • Off-site power is derived from the following sources: ¾ Koeberg 132 kV high-voltage yard ¾ Duyne 132 kV distribution substation • PBMR Generator ¾ When PBMR is not producing power, the AEPS can be supplied with power from the Koeberg 132 kV yard through the Generator transformer and the Module transformer. Alternatively, if this supply is not available, power to the plant’s auxiliaries can be obtained from the Duyne substation. ¾ Power to the auxiliaries can also be supplied from the Duyne substation while the plant is producing power and delivering it to the Koeberg 132 kV substation. February 28 – March 2, 2006 PBMR Safety and Design Familiarization 4 © Copyright 2006 by PBMR (Pty) Ltd. AEPS Functions • Provides and distributes electrical power to plant subsystem electrical loads (house load) • Controls the power to the electrical loads in conjunction with the Control and Instrumentation (C&I) System • Provides back-up power in case of the loss of off-site power • Protects auxiliary electrical and mechanical equipment against damage due to electrical faults, mechanical overload conditions and lightning strikes February 28 – March 2, 2006 PBMR Safety and Design Familiarization 5 © Copyright 2006 by PBMR (Pty) Ltd. Electrical System One-Line Diagram Off-site Off-site 132 kV Network MAIN ELECTRICAL POWER AUXILIARY ELECTRICAL PLANT 11 kV Alternative Supply SYSTEM (MEPS) SYSTEM (AEPS) Electrical Protection, Measurement and Control Generator Transformer Alternative Supply Module Transformer DG DG Main Diesel Main Diesel Generator 1 Generator 2 11 kV Distribution 11 kV Distribution Board 2 Starting transformer Board 1 SFC Auxiliary CBCS Transformers CBCS 400 V Standby Power 400 V Distribution 400 V Standby Power 400 V Distribution Distribution Board 1 Distribution Board 2 EB Board 1 Board 2 DG DG HVAC Starter Board HVAC Starter Board Lighting and Lighting and G Small Power PEM & Recovery Room Small Power PEM & Recovery Room Distribution Board Distribution Board Uninterruptible 690 V Auxiliary Cooling Uninterruptible 690 V Auxiliary Cooling Standby Supplies Distribution Board 1 Standby Supplies Distribution Board 2 GENERATOR SYSTEM (GS) GENERATOR SYSTEM 690 V Cooling Water Pumps 690 V Cooling Water Pumps Distribution Board 1 Distribution Board 2 Train 1 Train 2 Static excitation Electrical Protection and Control Electrical Protection and Control February 28 – March 2, 2006 PBMR Safety and Design Familiarization 6 © Copyright 2006 by PBMR (Pty) Ltd. Earthing AEPS Design Features Characteristic Description House load 7.1 MVA Power quality Normal voltage regulation: ± 5% of nominal voltage Short time voltage regulation: ± 10% of nominal voltage (1 h) Power frequency regulation: ± 2% of 50 Hz Short-time frequency regulation: -5%, +3% of 50 Hz (1 h) Voltage unbalance: negative phase sequence ± 1% of positive phase sequence Motor starting technology Intelligent motor control with communication bus to control system Distribution voltages 11 kV, 690 V, 400 V and 230 V Electromagnetic Compatibility Complies with US Reg. Guide 1.180, EPRI Guideline TR-102323 (EMC) Rev. 2 and relevant sections of IEC 61000 Main Diesel Generators Redundant sets Two local fuel tanks of 3 600 l for 12 h runtime Common fuel tank of 9 600 l Post-Event Monitoring and Redundant sets Recovery Room (PEMRR) Two local fuel tanks of 1 000 l for 24 h runtime diesel generators February 28 – March 2, 2006 PBMR Safety and Design Familiarization 7 © Copyright 2006 by PBMR (Pty) Ltd. Standby Diesel Generators • Two large 11 kV diesel generators are provided, one on each power train. The functions of the standby diesel generators are to provide: ¾ controlled shutdown power; and ¾ power for standby supplies during a loss of power to the station. • Two small 400 V diesel generators are provided to provide back-up power to the PEMRR and the UPS of the Reactor Protection System (RPS) and Post-Event Monitoring System. ¾ These diesel generators and associated switchgear are seismic qualified. February 28 – March 2, 2006 PBMR Safety and Design Familiarization 8 © Copyright 2006 by PBMR (Pty) Ltd. UPS Components UPS Loads 440 V Battery set Electromagnetic Bearing (EMB) supply (1 h) Oil pump motor supply (1 h) Standby lighting supply (1 h) Reactivity Control System (RCS) and Reserve Shutdown System (RSS) (4 h) Reactor Building access control and radiation monitoring (1 h) 220 V Battery set Lubrication oil system 110 V Battery set Electrical protection and control (Circuit-breakers, electrical protection panels, electrical measurement panel, SFC, etc.) 50 V Battery set Tele-control and communication C&I UPS C&I Services Building UPS Access control and radiation monitoring Standby lighting in control room and radiation monitoring area RPS and PEI UPS Reactor protection and post-event monitoring PEMRR UPS Lighting for PEMRR and its diesel generators Cooling Water C&I UPS C&I in the Cooling Water (CW) substation February 28 – March 2, 2006 PBMR Safety and Design Familiarization 9 © Copyright 2006 by PBMR (Pty) Ltd..
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