On-line detection of overheating material in turbine generators using chemical analysis

Sorita, Tetsuji; Minimi, S.; Fujimoto, Tsutomu; Takashima, M.; Nakamura, Kozo

doi:10.1109/ceidp.1999.807860

Cited by 3 publications

(5 citation statements)

References 5 publications

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“…The hydrogen seal oil or oil mist from bearing are known to inhibit chemical detection interfering the organic species or particulate in the generators [3]. The both peaks at 213 and 228 amu in the upper mass-spectrum are assigned to bisphenol-A, which is a characteristic indicator of epoxy [6]. It was found from GUMS analysis that the oil predominantly consists of aliphatic hydrocarbons.…”

Section: Mass-spectrometric Datamentioning

confidence: 97%

“…The concentration Ca will increase to approach the equilibrium level Caeq/Cneq corresponding to overheating. The observed relative concentration gradient for short period, Go [l/day], is combined to Caeq/Cneq [6]. Very small amounts (ca.…”

Section: Kinetic Modelmentioning

confidence: 99%

“…The authors provided a kinetic model in which the gas evolution and the adsorption of the organic species were simultaneously considered [6]. The total evolution rate from the material to the gas-phase, R, [ …”

Section: Kinetic Modelmentioning

confidence: 99%

“…The results of the off-line analysis so far are summarized in this section [5] [6]. The organic species in the approximately 10'' m3 in volume of hydrogen coolant was collected in tht: TENAX adsorbent followed by off-line GC/MS analysis in the laboratory.…”

Section: Off-line Analysis Of Generator Coolant Gasmentioning

confidence: 99%

“…The earlier papers including 1999CEIDP of the authors provided a chemical analysis technique to detect local overheating in the generator using a gas chromatography and mass-spectrometry system (GC/MS) [5] [6] (see the following section). Our previous technique was based on an off-line analysis, and so was hard to practically ust: to find sudden rise of temperature.…”

Section: Introductionmentioning

confidence: 99%

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A novel on-line method and equipment to detect local problems in turbine generators

Sorita

Enmanji²,

Kato³

et al.

2000 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.00CH37132)

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A continuous mass-spectrometric analysis of the evolved gases has been studied to achieve a novel on-line monitor for local overheating in hydrogen cooled turbine generators. The organic species evolved from the materials and the seal oil used in the generators were successfully detected employing a quadrupole mass-spectrometer. The overheating of the material and the oil contamination in the detector can be clearly discriminated by selecting mass numbers (channels) to detect out of 50 to 250 amu. More, each gas evolved from the material yields its individual mass spectrum, and hence the mass-spectrometric detection can define the material in which overheating spot exists by reference to the library of the decomposition gases. The mass-spectrometric equipment will realize a practical on-line (or continuous) monitor to detect local overheating in the operating turbine generators, combined with numerical data recognition system and the kinetic interpretation of the gas-evolution.

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Section: Mass-spectrometric Datamentioning

confidence: 97%

Section: Kinetic Modelmentioning

confidence: 99%

Section: Kinetic Modelmentioning

confidence: 99%

Section: Off-line Analysis Of Generator Coolant Gasmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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