Hydrocal BPD

·HYDROCAL BPD is a modular online monitoring system for high voltage bushings as well as partial discharge of bushings and the active part of power transformers. Bushing monitoring supports both the measurement of voltage and phase angle on the test tap to derive tanδ/PF and bushing capacitance as well as electrical partial discharge measurement acc. IEC 60270. For the partial discharge analysis within the active part of high voltage power transformers UHF (ultra-high frequency) measurement is supported.

·HYDROCAL BPD can be combined with other HYDROCAL models, preferably HYDROCAL genX, in order to set up a comprehensive monitoring system.
As per CIGRÉ Working Group A2.37 bushings resp. the lead exit represent the 2nd largest group of transformer failure locations (approx. 25%) after the windings (43%) and before the tap changer (23%) therefore bushing monitoring can help to reduce those failures whereas UHF partial discharge analysis of the active part of a power transformer is an ideal combination with online DGA performed by the HYDROCAL product family.
The modular concept of HYDROCAL BPD allows the user to select the combination of bushing monitoring and partial discharge functions that suits best to its monitoring needs and technology convictions. Whereas the measurement of voltage and phase angle on the test tap of high voltage bushings allows to compare tanδ/PF with factory test results the partial discharge analysis could help to detect electrical failures of those bushings faster. UHF (ultra-high frequency) partial discharge analysis of the active part of large power transformers can be a good method to determine winding or other electrical failures without disturbances e.g. by corona.