Thermal conductivity of the insulation system of the stator winding of a high-power turbogenerator with air cooling

Azizov, A. Sh.; Andreev, A. M.; Kostel’ov, A. M.; Polikarpov, Yu. I.

doi:10.3103/s106837120903002x

Cited by 4 publications

(1 citation statement)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Performance of the instantaneous protection function of this test is dependent on the polarization index (P.I) is also measured to provide a quantitative appraisal of the condition of the insulation for moisture and other contaminants [4,16]. [1,2] works reveal the electro-physical properties of a new type of high-efficiency heat conducting insulation for turbo generators with air and hydrogen cooling. They further stated that the addition of modified varnish with a high thermal conductivity coefficient to the insulation material does not yield any deterioration of its electrical properties.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of insulation resistance for turbo generator digital protection

Adaramola¹,

Chirpyen²

2020

Global J. Eng. Tech. Adv.

View full text Add to dashboard Cite

Insulation of all electrical machinery is practically in the form of organic compounds that contain water as part of their make-up. Excessive temperature tends to dehydrate and oxidize the insulation and make it become brittle and disintegrate under vibration and shock. The insulation lifespan of turbo generators deteriorates slowly at low temperatures and more rapidly at high temperature. Economic factors, such as initial cost, replacement cost, obsolescence, and maintenance, are of prime importance when determining the years of useful service desired for the electrical insulation. Generator digital protection- fault diagnosis test was carried out to find out the cause of insulation breakdown on the turbo generator unit 411G3. The experimental procedure consists of an insulation resistance test, meggering (time-resistance absorption test), and pendulum over-speed test. A thorough investigation was conducted to identify all the stator bars that constituted the Red phase and other connections. Voltage drops on these stator bars were measured and values were used to detect ground faults which were rectified via an intelligent protection scheme.

show abstract

Section: Introductionmentioning

confidence: 99%