Category Archives: D5-D5A Users

Understanding PD

Partial discharge is a breakdown phenomenon associated with electrical insulation having weak spots or flaws. While most of the insulation, in a generator for example, can withstand the electric forces experienced, electrical discharges occur in flawed areas, partially bridging the distance between conductors. This only happens when the electric field strength exceeds the breakdown strength […]

Posted in D5-D5A Users | Comments Off on Understanding PD

MHPS offers alternative solutions to address fleet issues

Wendel Zolyomi of Mitsubishi Hitachi Power Systems (MHPS) had a great deal to tell W501D5-D5A users at their organization’s winter meeting in early February. For newcomers, it seemed like a lot to assimilate in one sitting. O&M personnel with fleet experience were familiar with at least some of what the speaker had to say; however, the […]

Posted in D5-D5A Users | Comments Off on MHPS offers alternative solutions to address fleet issues

HRSG problem-solving 101: Don’t jump to conclusions

Sometimes you have to dig deeper into the detective work to identify not-so-obvious issues with your heat-recovery steam generators, HRST Inc’s Sam Shaw told the editors. Occasionally, captured DCS data are limited and more information is required to properly diagnose a nagging reliability issue. It’s easy to blame failures on an obvious root cause, but […]

Posted in D5-D5A Users | Comments Off on HRSG problem-solving 101: Don’t jump to conclusions

PAG acceptance grows with field experience

A CCJ special report by Consulting Editor Thomas F Armistead Powerplant operators, with good reason, are deeply reluctant to make changes in the basic components that their plants depend upon. There is simply too much at stake—system reliability, cost, lost revenue—to tinker with the operation of a plant that functions reasonably well 98% of the […]

Posted in D5-D5A Users | Comments Off on PAG acceptance grows with field experience

IEEE standards may not sufficiently address grounding issues in rotor, stator windings

Clyde V Maughan, clyde@maughan.com, Maughan Generator Consultants There are two, unfortunately common, generator-winding failure modes that the IEEE standards overlook: the fracture of a rotor (field) conductor and the fracture of a stator conductor. This article describes these types of failures, discusses associated negative impacts of them, and recommends corrective actions. On rotor windings, IEEE Standard […]

Posted in D5-D5A Users | Leave a comment