Re-locatable partial discharge transducer head

An apparatus for detecting partial discharge in on-line electrical equipment, the apparatus comprising:

• (a) a partial discharge detector that, while in use, continuously monitors the electrical equipment and comprises:
• (i) an electrically insulating elongate member that is adjustably extendible into the electrical equipment;
• (ii) an ultrasonic transducer means mounted at or adjacent a first end of the elongate member for detecting an ultrasonic pulse or wave generated by the occurrence of a partial discharge in the equipment and outputting a signal corresponding to this detection;
• and
• (iii) a RF transducer means for detecting at least the radio frequency (RF) pulses or waves generated by the occurrence of a partial discharge in the equipment and outputting a signal corresponding to this detection,
• said RF transducer means being adapted in operation to detect said radio frequency (RF) pulses or waves concurrently with the operation of the ultrasonic transducer means;
• (b) a support means for the partial discharge detector that is in turn removably mountable to the electrical equipment such that both the ultrasonic transducer means and the RF transducer means are positioned within the equipment and the elongate member extends through the support means to a second end positioned external the equipment;
• and
• (c) a signal processing and analyzing means that receives the signals output by both the ultrasonic transducer and the RF transducer means for detecting at least the radio frequency (RF) pulses or waves and provides an output indicative of detection of partial discharge on occurrence of such a discharge.