May 21, 2015
Recently PBA were engaged to carry out a set of head replacements on a 220kV ABB HPL Circuit Breaker at Haywards substation.
The work was carried out as part of a preventative maintenance programme which Transpower devised with the help of PBA’s expertise in addition to manufacturers specifications. These particular high operation CB's are critical to HVDC transfer as they connect a filter bank to the 'grid' which helps with reactive power and filtration of harmonic disturbances. The task involved degassing the poles prior to the head replacement, followed by refilling and carrying out a multitude of SF6 and Circuit Breaker tests including fine tuning to ensure all poles were operating optimally.