Title :
PD Characteristics for the Stator Windings According to Core Location
Author :
Oh, Bong-Keun ; Choi, KyoNam ; Kang, Dongsik ; Lim, Keejoe
Author_Institution :
Korea Water Resources Corp., Daejeon
Abstract :
Stator winding of hydro generator is gradually deteriorated by multi-stress and steady degradation of insulation results in insulation breakdown. The region where insulation breakdown occurs in stator winding is part where the multi-stress causes the defect of insulation material and electrical stress has been concentrated. Therefore, we judged locations of insulation breakdown to be varied according to various stress factors in service. In this paper, we drew the stator winding of hydro generators which has run for a long time and separated it into 3 parts (central part, end winding part, drawing part) according to the positions laid on the core. We performed electrical and thermal stress on these specimens for 1000 hrs under the same condition, measured the condition regularly and analyzed the insulation status of each winding by performing partial discharge test. In addition, we analyzed the trend of partial discharge concerning specimens that caused the insulation breakdown during aging
Keywords :
ageing; hydroelectric generators; insulating materials; machine insulation; partial discharge measurement; stators; thermal stresses; 1000 hrs; aging; electrical stress; hydro generator; insulation breakdown; insulation material; partial discharge characteristics; partial discharge test; stator windings; thermal stress; Degradation; Dielectrics and electrical insulation; Electric breakdown; Electric variables measurement; Partial discharge measurement; Partial discharges; Performance evaluation; Stator cores; Stator windings; Thermal stresses;
Conference_Titel :
Properties and applications of Dielectric Materials, 2006. 8th International Conference on
Conference_Location :
Bali
Print_ISBN :
1-4244-0189-5
Electronic_ISBN :
1-4244-0190-9
DOI :
10.1109/ICPADM.2006.284194
