State-monitoring device and state-monitoring method

A state-monitoring method in a state-monitoring device connectable to a monitoring target device, wherein a first time period, a second time period, and a third time period are set, the first time period being a time period before the monitoring target device is connected to the state-monitoring device, the second time period being a preparation period, after the monitoring target device is connected to the state-monitoring device, for diagnosing abnormality of the monitoring target device, the third time period being a time period, after the monitoring target device is connected to the state-monitoring device, during which abnormality of the monitoring target device is diagnosed,

• the state-monitoring method comprising:
• obtaining, by the state-monitoring device, during the second time period, sensing data representing a state of the monitoring target device from a sensor included in the monitoring target device;
• calculating, by the state-monitoring device, a diagnosis parameter in the second time period based on the sensing data obtained during the second time period;
• obtaining, by the state-monitoring device, characteristic data representing characteristics of the monitoring target device in the first time period and the second time period from a logger included in the monitoring target device;
• generating, by the state-monitoring device, using the characteristic data in the second time period and the diagnosis parameter in the second time period, a regression model representing a relationship between the characteristic data and the diagnosis parameter;
• estimating, by the state-monitoring device, using the regression model, a diagnosis parameter in the first time period, which corresponds to the characteristic data in the first time period;
• setting, by the state-monitoring device, diagnosis criteria, using the diagnosis parameter in the first time period and the diagnosis parameter in the second time period;
• and
• obtaining, by the state-monitoring device, during the third time period, the sensing data representing the state of the monitoring target device from the sensor included in the monitoring target device;
• calculating, by the state-monitoring device, a diagnosis parameter in the third time period, based on the sensing data obtained in the third time period;
• and
• diagnosing, by the state-monitoring device, abnormality of the monitoring target device, based on the diagnosis parameter in the third time period and the diagnosis criteria, wherein
• the monitoring target device is wind power generation equipment, and
• the sensor is a vibration sensor.