CONDITION MONITORING DEVICE, WIND TURBINE EQUIPPED WITH THE SAME, AND METHOD FOR REMOVING ELECTRICAL NOISE

A condition monitoring device determines whether abnormality has occurred to a bearing included in a rolling device. The condition monitoring device includes a condition monitoring sensor for detecting vibration of a bearing, a reference sensor, and a controller configured to determine whether abnormality has occurred to the bearing. The reference sensor is electrically non-insulated from the condition monitoring sensor, and disposed at a location less influenced by vibration generated when abnormality occurs to the bearing under monitoring. The controller is configured to identify a period during which electrical noise is generated, based on a detected value of the reference sensor, generate determination data by removing data for the period during which the electrical noise is generated, from the vibration data of the condition monitoring sensor, and determine whether or not abnormality has occurred to the bearing under monitoring, using the determination data.