1 S. Lusin, LV Cabling, CERN 06 Apr 06 LV Cabling 06 Apr 06 S. Lusin Fermilab / CERN Cabling from USC to UXC, Power Distribution

2 S. Lusin, LV Cabling, CERN 06 Apr 06 LV Cabling Issues … LV Project is responsible for supplying AC power to input of AC/DC converters For CAEN-based systems this means supplying power cabling to detector For Weiner-based systems power is supplied to USC Power cable chosen is 7x6mm^2, shielded, 23mm dia. Used for CAEN systems, Weiner systems & service power Will be CERN stores item 8 km on order Primary purpose is for installation in YE1, HF cable chain Some cable will be available for magnet test DCS cabling was subdetector responsibility In the interest of system coherence & installation schedule, ESSC has recently agreed to make DCS cabling design & procurement in cable chains for CAEN-bus systems an LV project responsibility Financial responsibilities still to be worked out with subsystems Cable is 50-conductor twisted pair Ends at detector patch panel “Standard” CERN stores cable for this purpose is not available in lengths that we need Alternate cable has been identified, at some cost savings, but needs termination by hand This should not be a problem. Cable counts are not large.

3 S. Lusin, LV Cabling, CERN 06 Apr 06 Cable Selection

4 S. Lusin, LV Cabling, CERN 06 Apr 06 Connectors US- UX Simple, robust design Can be used by all subsystems Service power uses similar connector Smaller insert, prevents cross- plugging Primary power, service power use same kind of cable Can be terminated in place

5 S. Lusin, LV Cabling, CERN 06 Apr 06 Patch panel connections Matches 7x6mm^2 cable to 2 or 3 Harting connector outputs Breakout box design has now been superseded by simple panel Grounding braid termination not shown

6 S. Lusin, LV Cabling, CERN 06 Apr 06 On- Detector (UX-UX) Dist.

7 S. Lusin, LV Cabling, CERN 06 Apr 06 Connectors at LVPS end … Original motivation for quick- connect system was modeled on LV distribution boxes used on standard rack power distribution units First deliveries of A3486 to B904 had standard three- phase plug (right) Needed modification to use 16A Harting connector (below) CMS environment will use 380 and 230V three-phase power Would like to introduce keying mechanism to prevent cross-plugging of AC-DC converters Working with POOL to have vendor implement keying

8 S. Lusin, LV Cabling, CERN 06 Apr 06 LV breakout boxes Favored solutions are currently H & J Needs to be coordinated with CERN POOL & CAEN

9 S. Lusin, LV Cabling, CERN 06 Apr 06 Service Power Options Local Cascade EASY power supplies in hostile area have internal controls that are powered from external source The external source is located in USC Original motivation was to provide battery backup for the control circuit in the hostile area Each EASY module has a control board Current requirements are: A mA All others- 400 mA Adds up to a substantial current in a long cable

10 S. Lusin, LV Cabling, CERN 06 Apr 06 Service power budget If all service power provided from USC …

11 S. Lusin, LV Cabling, CERN 06 Apr 06 Service power budget - Remote Service power supplies are on-detector …

12 S. Lusin, LV Cabling, CERN 06 Apr 06 Cascade Service Power Total power dissipation in USC is 4.7 KW Total power dissipation in cables is 308 W Assumes 10 mm^2 cable pair for ea. Subsystem (for approx. only) Motivation for cascade power configuration is to minimize impact on shared services

13 S. Lusin, LV Cabling, CERN 06 Apr 06 Global LV Partitioning Main UPS capacity is 1.5 MVA Contract is finalized, vendor is MGE Installation design is under way Six isolation transformers in USC 300 KVA each, 380V or 230V three- phase, no neutral Dual electrostatic shields Have to be partitioned out between subsystems Cabling imposes additional constraints No cable can be fed by more than one circuit breaker One circuit breaker can feed two triplets or three pairs One distribution cabinet can hold up to 35 circuit breakers Room for six cabinets available May need more than that

14 S. Lusin, LV Cabling, CERN 06 Apr 06 Proposal for Coordination …