Handbook of Large Turbo‐Generator Operation and Maintenance

A hybrid analytical-numerical approach for the analysis of salient-pole synchronous generators with a symmetrical damper cage

“…In this context, particular focus has recently been given to the damper winding usually embedded in the rotor of salient-pole SGs. In fact, although this additional winding is usually designed to improve the power system stability [2], it also affects the machine behaviour under different operating conditions, including steady-state. In fact, additional currents are induced and Joule losses are then also produced in the damper winding in any working condition, including no-load, due to the presence of parasitic harmonics in the airgap flux density [3].…”

A systematic framework to investigate the coverage of abnormal operating procedures in nuclear power plants

“…For example, a SPV analysis of a main generator may consider a single protective instrument as a SPV if by failing it can cause a unit trip or significant loss of production. ( [21]; p. 827) From the abovementioned quotations, it is evident that the key to the SPV assessment is to identify the catalog of components (i.e., SPV components), of which the failure may result in either the loss of productivity or an impairment of the operational safety of a given infrastructure. In other words, the safety as well as the productivity can be concurrently enhanced by spending more resources on critical components.…”

On-line monitoring of mechanical unbalance/ misalignment troubles in ship alternators by direct measurement of split-phase currents

“…[1], [2]. Many papers deal with electrical faults, and few ones refer of practical on line air-gap monitoring in power SGs [3], [4], [9], [15].…”

“…SG faults can be grouped as stator/rotor electrical faults [1], [2], [5][6][7][8], mechanical unbalances (due to the unbalanced magnetic pull (UMP), to bearing bad positioning and wear, and to line faults) [3], [4], [9][10][11][12][13][14][15][16], and other faults (in cooling, ventilating, braking systems, etc.) [1], [2].…”

“…No technique is well established for on-line evaluation of SG rotor eccentricities (REs). REs shorten bearing life-time, with over-heating and possible stator-rotor rubs [1][2][3]. SG's RE was studied in [12], [13], by using winding functions and in [9]- [11], [17] through finite elements.…”