Redundant power and communications on a single cable
Presents a method to provide redundant power and communications on a loop of cable, connecting 24 or more sensor systems. The power is distributed direct current, with a central battery Uninterruptible Power Supply (UPS). Communications are provided via bi-directional data paths. A 100% redundant power loop is three AWG 10 conductors and two shielded pairs, coextruded in a buriable sheath. Cutting a combination cable does not disable a looped system, since voltage drops will be compensated by individual DC/DC converters. A short from any single power conductor to ground shall cause a circuit breaker at the head-end to trip, removing the fault from the system. Diodes at each Processor isolate the fault. Supervision circuits signal the voltage imbalance. A bi-directional multiplexed addressable transponder at each Sensor accepts 8 alarm inputs. In the event of local failure, that transponder is bypassed. Head-end Cable Power is 48 volts DC, trickle charging a 48 Volt Battery. DC to DC Converters, with a nominal input voltage of 48 VDC (+-50%) provide a regulated 15 VDC at up to 0.8 Amps at each Processor. Local backup batteries may be provided at each sensor to allow redundant backup.
- Research Organization:
- Stellar Systems, Inc., Santa Clara, CA 95054
- OSTI ID:
- 5815982
- Report Number(s):
- CONF-870713-; TRN: 88-002581
- Journal Information:
- Nucl. Mater. Manage. Annu. Meet. Proc.; (United States), Vol. 16; Conference: 28. INMM annual meeting on safeguards: a mature technology, Newport Beach, CA, USA, 12 Jul 1987
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NUCLEAR FACILITIES
PHYSICAL PROTECTION DEVICES
POWER SUPPLIES
ELECTRIC CABLES
CIRCUIT BREAKERS
DC TO DC CONVERTERS
ELECTRIC BATTERIES
MULTIPLEXERS
POWER TRANSMISSION LINES
CABLES
CONDUCTOR DEVICES
ELECTRICAL EQUIPMENT
ELECTROCHEMICAL CELLS
ELECTRONIC EQUIPMENT
EQUIPMENT
EQUIPMENT PROTECTION DEVICES
055001* - Nuclear Fuels- Safeguards
Inspection
& Accountability- Technical Aspects