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LV Cabling 06 Apr 06

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

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LV Cabling 06 Apr 06

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

  2. 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. Cable Selection

  4. 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. Patch panel connections • Matches 7x6mm^2 cable to 2 or 3 Harting connector outputs • Grounding braid termination not shown • Breakout box design has now been superseded by simple panel

  6. On- Detector (UX-UX) Dist.

  7. 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. LV breakout boxes • Favored solutions are currently H & J • Needs to be coordinated with CERN POOL & CAEN

  9. Service Power Options • 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: • A3009- 650 mA • All others- 400 mA • Adds up to a substantial current in a long cable Local Cascade

  10. Service power budget • If all service power provided from USC …

  11. Service power budget - Remote • Service power supplies are on-detector …

  12. 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. 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. Proposal for Coordination …

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