The invention discloses a method and
system for detecting the state of a power
distribution transformer under
harmonic load influence. The method includes the following steps that: the
noise signals of the power
distribution transformer are detected; a
noise signal characteristic parameter and a
sound pressure level are extracted; and the
noise signal characteristic parameter is compared with a preset noise
signal characteristic parameter threshold value, if the noise
signal characteristic parameter is higher than the preset noise
signal characteristic parameter threshold value, it is judged that the power
distribution transformer is in a
harmonic load operating state, and the
sound pressure level is compared with a preset
sound pressure level early warning threshold value, if the sound
pressure level exceeds the preset sound
pressure level early warning threshold value, it is judged that the operation of the power distribution
transformer is abnormal, otherwise, it is judged that the operation of the power distribution
transformer is normal. The
system comprises a noise signal detection
program unit, a noise characteristic extraction
program unit and a state detection
program unit. According to the method and
system of the invention, contact with electrified equipment is not required, so that the safety of detection is high; workers are not required to go to
a site to carry out detection and analysis; and therefore, the method and system of the invention have the advantages of time-saving and labor-saving performance, high safety, high efficiency and convenient detection.