Injector, Sector 21 and BC1 Bulk Power Supplies MCOR Ground Fault Detection and Protection

1. Injector, Sector 21 and BC1 Bulk Power Supplies • MCOR Ground Fault Detection and Protection • New Power Supply Quantities, Heat Loads and Redundancy Idea • Paul Bellomo, Antonio de Lira, Dave Mac Nair

2. Bulk Power Supplies

4. Background The three 60V, 165A, 10kW bulk power supplies require remote turn on - turn off capability. No monitoring is needed. Ethernet controller interface specified. Problem Power supplies operate in voltage, not current mode. Ethernet controller does not accommodate. No front panel, local control mode Solution Use manually controllable 60V, 165A, 10kW power supply

7. Remove Two 60V, 165A, 10kW Ethernet power supplies (not yet purchased, bids due 10/17) Increase quantity of 25V, 375A, 10kW power supplies by two for BC1 No change in overall quantity or cost Delete two 25V, 375A, 10kW power supplies for BC1 not yet purchased Write purchase requisition for three 60V, 165A, 10kW MCOR local control bulk power supplies instead of one bulk for the Sector 21, BC1 MCORs – Net 1 add Increase in quantity - zero Overall change 0 10kW power supply, 0k$

9. Ground Fault Detection and Protection

10. The MCOR System does not include ground fault detection and protection Why Ground Fault Detection and Protection? Prevent power supply current from straying outside magnet Can lead to equipment damage or fire Current read by power supply transductor is not the magnet current Ground current fluctuates causing erratic magnet current The next few slides propose a ground fault detection and protection system.

13. Dataforth DSCA31-06 Signal Conditioner

18. New Power Supplies All areas excluding Injector, LINAC Sector 21, BC1

20. Not an uninterruptible system • “Standard” power supplies • No hot-swap • Bulk-fed or off-line PS • Redundant control system • Low switch stress • Lower cost than redundant modules

21. END !!!