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4.2 Is UPS needed?
| Power status in Japan is stable in general and blackout occurrence
rate caused by power feeding failure is low. However, momentary blackout
in switching power feeder lines by power company is relatively high.
Momentary blackout for several milliseconds of time is said to occur
around 4 times per year. Also, although large scale blackout is low,
another blackout such as operation of circuit breakers, accidental
unplugging may occur. In addition, momentary voltage drop at startup
of large motors, or power failure caused by lightning surge may happen.
Power failure mentioned above may bring severe damage such as malfunction
of computers and vanishing of data. In case of system failure, it
takes you a lot of money and time to recover. Of late, uninter- ruptibility
of entire network is being required due to increase and practical
realization of Information and Telecommunications such as LAN and
Internet, and rising importance for server data. Demand for USP is
increasing in highly reliable systems as UPS protects computer systems
from power failure.
<< Applicable system for UPS >>
[System that requires high reliability]
- Online system for financial institutions
- Internet providers
- Public broadcasting and telecommunication equipments
- Disaster prevention management system
- Medical management system
- Critical servers and workstations
[System that is used under poor and harsh environment of power
supply]
- Areas where lightning and momentary voltage fluctuation frequently
occur.
- Area where power source noise frequents.
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