BAU-Plus
The BAU+ sensor serves provides bushing signals for bushing insulation characteristics, PD in bushings and transformers, and more.
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The BAU+ (Bushing Adapter Unit) sensor is a multi-purpose sensor that eliminates the need for a separate sensor for each application, providing bushing insulation signals, partial discharge detection in bushings and transformers, and noise-filtering circuitry via Rogowski coils. It carries an IP-67 environmental rating and is designed for use in power transformers, isophase bus ducts, and HVCTs.
The BAU+ sensor is built in three separable sections: body, adapter, and cable connector. The body can be detached from the adapter by removing just three screws. This gives technicians direct access to the bushing’s test tap, or the adapter can be removed entirely for additional working room, without needing to replace the whole sensor assembly.
The BAU+ sensor uses three layers of protection: six voltage limiters with a current-balance circuit for open circuit protection (the lowest in the industry), two surge protection circuits for switching and system transients, and a fail-safe circuit that automatically grounds the tap if the first two protections fail.
Each BAU+ sensor delivers signals for imbalance, bushing leakage current, capacitance, power-factor, and partial discharge measurements — covering the core diagnostics needed to assess bushing insulation health in a single sensor.
The BAU+ sensor supports 50+ custom adapters to fit various test tap styles, and uses 50 Ohm coax cables for accurate signal transmission over longer distances, plus a Rogowski coil amplifier and cable to aid in partial discharge noise filtering.
The BAU (Bushing Adapter Unit) is a sensor that enables online monitoring of transformer bushings by collecting measurement data used to evaluate bushing condition.
According to CIGRE Technical Brochure 939 (2024), about 25% of transformer failures are due to bushings. Continuous monitoring provides early warning of insulation deterioration and other developing issues.
The BAU supports collection of data used to evaluate bushing power factor, capacitance, and changes in insulation condition over time.
Yes. BAUs are commonly deployed in retrofit applications as part of an online bushing monitoring solution.
BAU sensors provide measurement inputs that can be analyzed by the C50 monitoring platform for trending, alarming, and diagnostics.
Yes. Tracking changes in bushing condition can provide early indication of developing issues before catastrophic failure occurs.
Bushing monitoring solutions can be applied to a variety of transformer bushing designs depending on system configuration. For over 15 years, Dynamic Ratings has designed more than 70 adapters and has flexibility to meet your bushing adapter needs.
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