Title:
SWITCH OPERATION CHARACTERISTIC MONITORING DEVICE, SWITCH COMPRISING THE SAME, AND SWITCH OPERATION CHARACTERISTIC MONITORING METHOD
Document Type and Number:
Japanese Patent JP2018032566
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To accurately detect a sign of abnormality with respect to an operation characteristic of a switch.SOLUTION: A switch operation characteristic monitoring device is constituted by: a current sensor for measuring closing command current for a switch; an auxiliary switch for outputting signals depending on positions of contact pieces from at least two or more auxiliary contacts; a measurement unit for measuring signals from the current sensor and the auxiliary switch; a diagnosis unit for determining the existence of abnormality; and a display unit for performing display showing abnormality when it is determined that the abnormality exists. The switch operation characteristic monitoring device: calculates a threshold from a plurality of results of opening/closing tests performed in advance; calculates feature time obtained from closing command current and a signal from the auxiliary switch at the time of a breaker operating actually; and determines abnormality when comparison with the threshold shows deviation.SELECTED DRAWING: Figure 7
Inventors:
TATEMI MASARU
ROKUNOHE TOSHIAKI
HIROSE MAKOTO
UCHIYAMA HIDEAKI
ROKUNOHE TOSHIAKI
HIROSE MAKOTO
UCHIYAMA HIDEAKI
Application Number:
JP2016165279A
Publication Date:
March 01, 2018
Filing Date:
August 26, 2016
Export Citation:
Assignee:
HITACHI LTD
International Classes:
H01H9/54; H01H33/00; H02B13/035; H02B13/065
Domestic Patent References:
| JP2003308751A | 2003-10-31 | |||
| JPS62226519A | 1987-10-05 | |||
| JP2008293682A | 2008-12-04 |
Attorney, Agent or Firm:
Yuji Toda