Power Supply and Energy Extraction System for the CBM magnet - PowerPoint PPT Presentation

Power Supply and Energy Extraction System for the CBM magnet Conceptual Design Report Dr. Erokhin Alexandr, BINP GSI, 24.04.2018

Power Supply and Energy Extraction System for the CBM magnet  Introduction  Powering Circuit  Power Supply – VCH1000  Quench detection  Energy Extraction System, basic elements  Experience  Conclusion. 23.04.2018 2

Power Supply and Energy Extraction System for the CBM magnet Introduction Requirements for the external protection system (Quench detection and Energy Extraction): The amount of the stored energy to be extracted is 5.1MJ. Stored energy should be  extracted to the external dump resistor with the value of 2 Ohm. The active elements of the dump resistor should not be hotter than 100C. Cooling time should be specified; Quench detection circuit should provide fast detection of the normal phase appearing.  The discrimination time should be about 6ms and the threshold – about 0.6V (0.6V corresponds to 6 wounds in the normal state); Number of the voltage tabs and the locations of their connections should be determined;  Dump resistor should be introduced to the circuit not later than in 40 ms. That gives the  demands on the energy extraction switch (current breaker); Dump resistor value - 2 Ohm. Middle point should be introduced and grounded in order  to minimize the voltage between the coil and ground. 23.04.2018 3

Power Supply and Energy Extraction System for the CBM magnet Powering circuit R_Dump, 1 Ω Option 1 S 1 S 2 R_ g 1k Ω L 1 C snab C snab PS R_Dump, 1 Ω R_ g 1k Ω L 2 S 1 S 2 C snab C snab 23.04.2018 4

Power Supply and Energy Extraction System for the CBM magnet Powering circuit S 1 S 2 Option 2 R_Dump, 1 Ω L 1 C snab C snab PS R_Dump, 1 Ω L 2 S 1 S 2 Option 1 or 2? C snab C snab Depends a lot from the racks positions 23.04.2018 5

PS Power Supply (Current Source – VCH1000) 23.04.2018 6

PS Power Supply – block diagram Synchronous Rectifier Input Load Rectifier Inverter DCCT DCCT DAC electronics DCCT ON/OFF circuit Ripples FEEDBACK Synchronous Synchronous interlocks compensation Inverter Drivers Rectifier Driver Rectifier Driver 23.04.2018 7

PS Power Supply – parameters : Nominal output power 12kWt;  Nominal output current 10 00А ;  Nominal output voltage 12V;  8 hours run Stability - < 0.01% from nominal;  Output ripples in voltage:  0-300Hz - < 10mV rms, 0- 40кГц – < 100mV rms; Control Interface – CAN  Form factor 19” x 4U  23.04.2018 8

PS Interlocks: Overcurrent (I > “Imax”);  Overpower (Pload > “Pmax”);  Phase distortion for more than 20% ;  Over temperature of the power part;  External Load faults (temperature, water).  Conditions: External conditions – room temperature 10– 35 0 С ;  Input power line – 3 phases 380V with neutral.  Cooling – distilled water not warmer than 30 0 С ,  Maximal input pressure 6bars,  Water consumption 2 liters/min,  Water gradient with the maximal power < 10 о С  Sizes 547*550*133mm, weight 25kg.  23.04.2018 9

PS control electronics 23.04.2018 10

Quench detection, functional diagram + Quench detector, Quench simulation Analog/Digital I/O - Magnet coil Energy Power FAIR Extraction Converter I/O System FBAS (Fast Beam Abort System). FAIR protection loop 23.04.2018 11

Energy extraction system R_dump S 1 S 2 C snab C snab № Parameter Value Unit А 1. Maximal current 686 2. Energy stored in the magnet 5.1 MJ 3. Current polarity bipolar 4. Maximal inductance in a circuit 20+20 Hn 2 ± 5% 5. Dump resistor value Ohm К 7. Maximal overtemperature of the Dump Resistor 80 8. Maximal time delay for the energy extraction <0.04 s 23.04.2018 12

Energy extraction system R_Dump, 1 Ω S 1 S 2 R_ g 1k Ω L 1 C snab C snab PS R_Dump, 1 Ω R_ g 1k Ω L 2 BrA S 1 S 2 Csnab 0.8 мФ BrB C snab C snab Ra Rb Rc 440u 440u 440u 23.04.2018 13

Energy extraction system BrA Two breakers for redundancy. Each one is drived by the independent electronic channel Csnab 0.8 мФ BrB Equalizing resistors to improve the Ra Rb Rc current sharing between phases 440u 440u 440u C snab – snubber capacitor to minimize the arc effect. 23.04.2018 14

Energy extraction system Electromechanical Breaker and use of snubber Voltage over the contacts while opening the circuit with С snab = 0 VA57-35 after 100 cycles under VA57-35 after 100 cycles under the full current , without snabber the full current , with snabber , С snab = 0.8 mF Voltage over the contacts while opening the circuit with С snab = 0.8 mF 23.04.2018 15

Energy extraction system Example - 202 energy extraction systems for the LHC corrector magnets delivered by BINP to CERN. ( более 100 шкафов! ) Two systems per rack Racks in the LHC tunel 23.04.2018 16

Thanks for Your Attention! 23.04.2018 17