無停電電源システムの開発と房総半島の大大特地震観測網への設置
中島 剛
・宮川幸治
Development of Uninterruptible Power Supply Systems and their Deployment at
Online Seismic Observation Stations in Chiba Prefecture
Gou NAKAJIMA
and Koji MIYAKAWA
Abstract
We have developed an uninterruptible power supply (UPS) systems suitable for permanent seismic
stations, and have used it to replace commercial UPS systems at seismic stations belonging to the
Daidaitoku seismic network. For use in seismic stations, the newly developed UPS system oers several
advantages over the commercial UPS systems that are often used to protect personal computers from a
sudden power failure. First, independent cut-o voltages can be set for two dierent output circuits, one
for an ISDN router and the other for a seismometer and data logger. In addition, DC power can be
supplied using a battery, and the eciency is improved by about two times. Finally, the new UPS is
more compact, which allows easier handling at stations.
When a battery with a capacity of 40 Ah is used, the newly developed UPS is designed to supply
continuous electric power to equipment for seven days after a commercial power failure. To achieve
this, the power to the ISDN router, which represents approximately 70% of the total power, is automatically
turned o about two days after the power failure occurs. The power supply to the data logger and
seismometer is maintained until the battery voltage reaches a preset lower limit, in order to prevent
deep discharge. If the commercial power supply is restored at the station, all systems are restarted and
the battery is automatically recharged.
After being installed in the Daidaitoku seismic network, the new UPS systems functioned without
any problems. Therefore, the power system in seismic stations can be successfully upgraded in this
manner.
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