NEW TECHNOLOGY HITACHI UNINTERRUPTIBLE POWER SYSTEM

다국어 초록 (Multilingual Abstract)

With the use of uninterruptible power systems (UPS), growing rapidly, Hitachi UPS have been enhanced and expanded with a unit capacity from 1 to 600 kVA now available. In the small-capacity power systems for office automation, the low-noise compact-type HIVERTER-88 Series have been developed using MOS FET technology to increase the control carrier frequency. In the medium-capacity power systems for minicomputer and plant instrumentation applications, the stand-by type HIVERTER-850α as been developed, introducing pulse width modulation (PWM) control and integrating the commercial bypass system. For the large-capacity UPS, an computer simulation method is applied to coordinate operation with the emergency generator. And, an online-monitor system has been developed to remotely observe the UPS operation and improve the mainability.

목차 (Table of Contents)

• Abstract
  
• 1.GENERAL
  
• 2.NOW TECHNOLOGY FOR THE HIVERTER SERIES
  
• 3.SYSTEM RELIABILITY VERIFICATION BY SYSTEM ANALYSIS
  
• 4.MAINTENANCE SUPPORT BY THE ON-LINE MONITOR
  
• 5.CONCLUSION
  
• References