公开(公告)号：US20180062382A1

公开(公告)日：2018-03-01

申请号：US15674682

申请日：2017-08-11

Applicant: Hitachi, Ltd.

Inventor： Masaru TATEMI ,  Toshiaki ROKUNOHE ,  Makoto HIROSE ,  Hideaki UCHIYAMA

IPC: H02H7/085 ,  H02H5/00 ,  H02H3/04

CPC classification number: H02H7/0854 ,  G01R31/3274 ,  G01R31/343 ,  H01H9/0066 ,  H01H33/59 ,  H02H3/04 ,  H02H3/044 ,  H02H5/00

Abstract: A symptom of malfunction regarding operating characteristics of a switch should be detected exactly. A switch operating characteristic monitoring device is comprised of a current sensor that measures a close command current of a switch, an auxiliary switch that outputs signals from at least two or more auxiliary contacts with reference to positions of a contactor, a measurement unit that measures signals from the current sensor and the auxiliary switch, a diagnosis unit that judges whether or not a malfunction occurs, and a display unit that displays a malfunction when a malfunction has been determined. A threshold is obtained in advance from multiple results of an opening/closing test performed beforehand. A calculation is made for characteristic times which are obtained from the close command current and signals from the auxiliary switch during actual operation of a circuit breaker. If a deviation is found by comparison with a threshold, a malfunction is determined.

公开(公告)号：US20170030799A1

公开(公告)日：2017-02-02

申请号：US15216736

申请日：2016-07-22

Applicant: Hitachi, Ltd.

Inventor： Hisao INAMI ,  Makoto HIROSE ,  Hiroyuki NAKAMICHI ,  Masaru TATEMI ,  Toshiaki ROKUNOHE

IPC: G01M3/32 ,  H02B7/01

CPC classification number: G01M3/3263 ,  H02B13/065 ,  H02B13/0655

Abstract: A gas leak detection device includes a learning section, which has a correlation between a gas temperature inside gas pressure containers and a surface temperature of the gas pressure containers in a learning period corresponding to a current value flowing in the conductor, to make database, and a diagnosis section, which extracts a gas temperature corresponding to the measured current value and the surface temperature from the learning section in a diagnosis period, corrects a gas pressure value corresponding to an arbitrary surface temperature to a gas pressure value of a reference temperature using the extracted gas temperature, and detects a leak of the insulating gas based on the corrected gas pressure value.

Abstract translation: 气体泄漏检测装置包括学习部，其在与在导体中流动的电流值相对应的学习时段内具有气体压力容器内的气体温度与气体压力容器的表面温度之间的相关性，以形成数据库;以及 在诊断期间，从学习部提取与测定的电流值和表面温度对应的气体温度的诊断部，使用该温度校正与任意表面温度对应的气体压力值为基准温度的气体压力值 提取气体温度，并且基于校正后的气体压力值检测绝缘气体的泄漏。