Patent ID: 8126664

Claim:
An apparatus for detecting, localizing and interpreting a partial discharge occurring in a partial discharge site along an electrical equipment, comprising: two measurement probes and a synchronization probe installable along the electrical equipment so that pulses travelling in the electrical equipment are detectable by the measurement probes and a phase angle in the electrical equipment is detectable by the synchronization probe; a control unit connecting to the measurement probes for receiving signals representative of the detected pulses, and connecting to the synchronization probe for acquiring a signal representative of the detected phase angle, the control unit having a circuit for selective conditioning of the received signals; and a digital processing unit connecting to the control unit for acquiring the signals after selective conditioning as a function of the detected phase angle and driving the control unit, the digital processing unit having a correlation measuring module for measuring correlation of the acquired signals, a module for performing a time-frequency distribution of at least one of the acquired signals, a form factor estimating module for estimating a form factor corresponding to a ratio of a spectral bandwidth over a time length of a discharge pulse derived from the time-frequency distribution, and a diagnosis module configured for interpretation of the correlation and the form factor for generating a diagnosis indicative of a detection of a partial discharge and of a localization of the partial discharge along the electrical equipment based on the interpretation.