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公开(公告)号：US20220099755A1
公开(公告)日：2022-03-31
申请号：US17355948
申请日：2021-06-23
Applicant: Hitachi, Ltd.
Inventor： Tomohiko YANO , Takashi KAWAMOTO , Hideyuki NAGAISHI
Abstract: A leakage voltage detection system can be easily mounted on a ground structure such as an existing street light or a traffic light and can detect a leakage voltage of an electric structure in real time. The leakage voltage detection system includes a sensor node mounted on a ground structure, and an equipment management server that determines a risk of a leakage voltage in the ground structure based on detection voltage information from the sensor node. The sensor node includes an electric field probe that measures a potential difference caused by an electric field detected by electrodes, and a sensor box that detects the potential difference between the electrodes of the electric field probe and transmits the potential difference to the equipment management server as a detection voltage. The equipment management server determines the risk of the leakage voltage where the sensor node is mounted based on the received detection voltage from the sensor node, and outputs information on determination of the risk of the leakage voltage.
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2.发明申请公开(公告)号：US20160315627A1
公开(公告)日：2016-10-27
申请号：US14901914
申请日：2013-11-07
Applicant: HITACHI, LTD.
Inventor： Takashi KAWAMOTO
CPC classification number: H03L7/102 , H03B5/1212 , H03B5/1228 , H03B5/1265 , H03B2200/0038 , H03B2201/011 , H03L7/083 , H03L7/0891 , H03L7/099
Abstract: A resonator is supplied with voltage from a constant-voltage source, and the constant-voltage source outputs output voltage adjusted by a voltage adjustment signal to the resonator. The resonator outputs a clock signal having a frequency varied by varying capacitance in accordance with a received control signal and a frequency adjustment signal, and a frequency of the clock signal is varied by voltage output from the constant-voltage source.
Abstract translation: 谐振器由恒压源提供电压，恒压源通过电压调节信号将输出电压输出到谐振器。 谐振器根据接收到的控制信号和频率调整信号输出具有由变化的电容变化的频率的时钟信号，并且通过从恒定电压源输出的电压来改变时钟信号的频率。
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公开(公告)号：US20250104271A1
公开(公告)日：2025-03-27
申请号：US18598375
申请日：2024-03-07
Applicant: Hitachi, Ltd.
Inventor： Ryotaro KAWAHARA , Akira MURATA , Nobuyuki KUSUNOSE , Takashi KAWAMOTO
Abstract: Provided are an electrical equipment state monitoring system and the like capable of grasping a three-dimensional aspect of electrical equipment and an electromagnetic field derived from its state.
An electrical equipment state monitoring system for monitoring a state of electrical equipment includes: a reception unit that receives inputs of three-dimensional space information about an area including the electrical equipment and electromagnetic field data including electromagnetic field information regarding an intensity of an electromagnetic field derived from the electrical equipment and three-dimensional coordinates of a point where the electromagnetic field information is acquired; a data superimposing unit that superimposes the three-dimensional space information and the electromagnetic field data in the same space based on the three-dimensional coordinates to generate superimposed data; and a superimposed data output unit that outputs the superimposed data from the electrical equipment state monitoring system.
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