Omron Corporation

Tomohiro Yamada

Masaaki Nagano

Takahiro Sato

Tomonori Watanabe

Tsuyoshi Takeuchi

Kohei Tanino

Ryo Ikeuchi

Takuya Fukudome

Koji Yokota

Peng-Cheng Zhao

Provided is an insulation resistance monitoring device that enables measurement of insulation resistance using a mega tester without removing the insulation resistance monitoring device. The insulation resistance monitoring device that monitors the insulation resistance of an object to be measured such as a motor includes: a current detecting unit that is connected between the power supply line and the ground line of the motor and detects a current flowing through the insulation resistance of the motor; a voltage generating unit connected between the power supply line and the ground line of the motor; and a switch for opening and closing the connection path between the power supply line or the ground line of the motor and the voltage generating unit, wherein the off resistance when the connection path is opened is 100 M&#x3a9; or more.

Insulation resistance monitoring device

An insertion determination unit () for precisely calculating a ground insulation resistance component of a leakage current regardless of the presence or absence of an inverter determines whether an inverter () is inserted between a commercial power system () and a three-phase motor (). A resistance component leakage current calculation unit () calculates a ground insulation resistance component of a leakage current on the basis of a calculation procedure corresponding to the result of the above determination.

Leakage current calculation method

Growing community of inventors

Shiga, Japan

Tomohiro Yamada