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Substation maintenance is a process of periodic, planned inspection of and, if necessary, repair, and replacement of all switchgear, buildings, and ancillary equipment in substation installations. In simple terms, substation maintenance is a regimen of regular preventative checks and actions carried out to ensure substations are kept in good working order. This process typically consists of a series...
Properly analyzing power system clearing times is vital in determining what the actual hazards are. These clearing times are measured in cycles or milliseconds. Many arc flash hazard analysis are done using the relay curve of a protective device when the actual clearing time of the circuit involves many more devices such as CT's, interposing relays and circuit breaker action. This actual clearing...
While retrofitting protections and meters in substations, the older equipment get replaced with newer ones with the rest of the installation such as current transformer (CT) and lead remaining undisturbed. Utilities have standardized on their older current transformers and want to maintain the same current transformer specifications throughout their system even in their newer installation. An extension...
The internal inspection for a GCB (gas circuit breaker) is regularly performed to check and change contact parts in the case that the number of times of fault current breaking reaches a specified number, because TBM (time based maintenance) criteria is generally applied. Our new system, however, can change maintenance criteria to CBM (condition based maintenance). Current interval for internal inspection...
The following topics were dealt with: NEMA magnet wires; power cables; generator diagnostics and materials; transformer materials and design; insulating materials; polymeric films; motor design and analysis; drive system; outdoor insulators; outsourcing; electrical manufacturing; coil winding; ultracapacitors; servomechanism; fuel cell applications; current transformers; predictive maintenance; switching-mode...
Corona discharge (CD) and partial discharge (PD) indicate early stages of insulation problems in motors and generators. Early detection of CD/PD will enable better coordination and planning of resources such as maintenance personnel, ordering of parts, etc. Most importantly, one can prevent catastrophic failures during normal operations. In decades, on-line PD measurement has been used to find loose,...
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