公开(公告)号：EP4357740A1

公开(公告)日：2024-04-24

申请号：EP22824591.6

申请日：2022-03-22

申请人： Hitachi, Ltd.

发明人： ENDO Takashi ,  IWATA Takeshi ,  ROKUNOHE Toshiaki ,  KOYAMA Hikaru ,  DOHI Kota

IPC分类号： G01H17/00 ,  H02B3/00

CPC分类号： H02B3/00 ,  G01H17/00

摘要： It is possible to accurately grasp the state of a circuit breaker by diagnosis using a sound. An acoustic diagnosis device extracts a first feature amount of an acoustic signal in which a delay of an acoustic signal collected by a microphone is corrected, the delay being generated from a relative distance between the circuit breaker and the microphone, during a normal operation of the circuit breaker for various events of the circuit breaker, and creates a plurality of event models for managing data regarding the first feature amount of the corrected acoustic signal. The acoustic diagnosis device extracts a second feature amount of an acoustic signal in which a delay of an acoustic signal collected by the microphone is corrected, the delay being generated from a relative distance between the circuit breaker and the microphone, during diagnosis of the circuit breaker, calculates a similarity between the second feature amount of the acoustic signal during the diagnosis and the first feature amount in the plurality of event models for each time, estimates the time at which the similarity becomes highest, as an occurrence timing of each event, and diagnoses the circuit breaker from a plurality of estimated occurrence timings.