High-availability power systems: Redundancy options

In major applications like major computer installations, process control in chemical plants, safety monitors, IC units of hospitals etc., even a temporary power failure may lead to large economic losses. For such critical loads, it is of paramount importance to use UPS systems.

But all UPS equipments should be completely de-energized for preventive maintenance at least once per year. This limits the availability of the power system. Now there are new UPS systems in ....etc

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ABSTRACT
Almost all firms use UPS systems. They maintain the continuity of supply in case of power outages. But all UPS equipments regardless of manufacturer should be completely de-energized for preventive maintenance at least once per year. This limits the availability of the power system.
But now-a days certain configurations of the UPS systems are there to permit concurrent maintenance so that we can overcome the above problem.

INTRODUCTION
In major applications like major computer installations, process control ....etc

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Hi
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Almost all firms use UPS systems. They maintain the continuity of supply in case of power outages. But all UPS equipments regardless of manufacturer should be completely de-energized for preventive maintenance at least once per year. This limits the availability of the power system. But now a -days certain configurations of the UPS systems are there to permit concurrent maintenance so that we can overcome the above problem. Each of the system configurations described in this paper has its own advantages and disadvantages. The single module syst ....etc

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Wireless Power Transmission Options for Space Solar Power
Presented By:
Henley, M.W. (1), Potter, S. D. (1), Howell, J. (2), and Mankins, J.C. (3)
(1) The Boeing Company, (2) NASA Marshall Space Flight Center, (3) NASA Headquarters
Wireless Power Transmission Options
for Space Solar Power
Far Term Space Systems to beam power to Earth
Radio-Wave WPT System
Light-Wave Systems
Near term Technology Flight Demonstrations
Model System Concept 1A: 100 kWe ....etc

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INTRODUCTION
A major problem facing Planet Earth is provision of an adequate supply of clean energy. It has been that we face ..three simultaneous challenges -- population growth, resource consumption, and environmental degradation -- all converging particularly in the matter of sustainable energy supply. It is widely agreed that our current energy practices will not provide for all the world's peoples in an adequate way and still leave our Earth with a livable environment. Hence, a major task for the new century will be to deve ....etc

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