To detect that insulation resistance of an electric system tends to decrease.SOLUTION: An insulation resistance reduction detection device includes: an oscillation power source; a detection resistor whose one terminal is connected to the oscillation power source; a coupling capacitor connected between the other terminal of the detection resistor and an electric system; and a determination device for determining reduction in insulation resistance of the electric system on the basis of a voltage amplitude of a connection point to which the other terminal and the coupling capacitor are connected. The determination device determines whether or not the insulation resistance tends to decrease on the basis of a histogram whose class is a voltage amplitude of the connection point.SELECTED DRAWING: Figure 5
【課題】電気系の絶縁抵抗が低下傾向であることを検出する。【解決手段】発振電源と、一方の端子が発振電源に接続される検出抵抗と、検出抵抗の他方の端子と電気系との間に接続されるカップリングコンデンサと、他方の端子とカップリングコンデンサとが接続される接続点の電圧振幅に基づいて電気系の絶縁抵抗の低下を判定する判定装置と、を備える絶縁抵抗低下検出装置であって、判定装置は、接続点の電圧振幅を階級とするヒストグラムに基づいて絶縁抵抗が低下傾向であるか否かを判定する。【選択図】図5
INSULATION RESISTANCE REDUCTION DETECTION DEVICE
絶縁抵抗低下検出装置
2021-08-05
Patent
Electronic Resource
Japanese