Airborne Acoustic (AA)

Airborne Acoustic (AA) ultrasonic sensor detects airborne acoustic signals from PD into air, including corona ( in outdoor substations ) and surface discharges and tracking ( in indoor air-insulated switchgear).

Figure 9 Airborne Acoustic (AA)

The AA sensor can be installed either inside or outside the switchgear panel, with clear line of sight to the PD source. It’s used in the HVPD’s MV AIS Switchgear Monitoring Solution in conjunction with the HVPD Kronos Monitor and Linearplex expansion module. When there a need for On-line PD monitoring of the MV AIS, the AA sensors are daisy-chained inside and along the AIS switchboard, typically with one sensor per switchgear panel.