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Aging effects of conductor surface conditions on AC corona discharges were investigated by means of comparing three typical aged conductors with the new ones. The aged conductors acquired from the AC power transmission lines had been used for 12, 15 and 20 years. Scanning electron microscopy (SEM) and Energy-dispersive X-ray (EDX) analysis were employed to characterize the morphologies and the compositions...
The stator winding insulation system on service is exposed to a combination of thermal, electrical, environmental and vibrational stresses. With the introduction of the epoxy mica insulation system, most failures that gradually degrade the stator winding are the result of bar (or coil) vibration (The term "bar" will be used generically to include coils in this article), especially in high...
The actual stator bars of an 18 kV/300 MW generator were used for accelerated multistress aging tests to investigate the degradation of ground insulation. An aging system with combined stresses including thermal, electrical, mechanical vibration, and thermomechanical factors was used to test the aging of stator bar specimens. The nondestructive parameters including partial discharge (PD) quantities...
The usage of silicone rubber insulators in various contaminated areas has increased prominently in recent years in China, and it still keeps this increasing trend. As the energized time in the field is prolonged, the change of hydrophobicity and the accumulation of pollution directly affect the electrical insulation performance of composite insulators. This paper reports the electrical insulation...
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