열역학법을 이용한 중규모급 수력플랜트 현장 효율 시험 (Field Efficiency Measurement Test of a Hydropower Plant Using Thermodynamic Method)

서지정보

· 발행기관 : 한국유체기계학회
· 수록지 정보 : 한국유체기계학회 논문집 / 23권 / 3호 / 13 ~ 20페이지
· 저자명 : 김대근, 조태영, 조용, 이계복

초록

The field efficiency test for a hydropower plant where a Franics hydraulic turbine is installed has been carried out by thermodynamic method usually used for the high head hydraulic turbine over 100 m. During the testing, the loss of hydraulic energy converted to thermal energy is measured by a precise thermometers with accuracy of 0.001K to estimate the efficiency.
In order to measure the water temperatures on the low-pressure measuring section in the draft tube, two perforated pipes were used per draft tue outlet. Three thermometers were installed in these perforated pipes in each draft tube outlet. On the high-pressure measuring section at the casing inlet, 2 opposite thermometers were installed to obtain the inflowing water temperature. The field test was conducted for total 39 cases while adjusting the power output from max. 52.0 MW to min. 19.2 MW. Error analysis of the test results confirmed that the max. absolute uncertainty of turbine efficiency is 0.73% and repeatability is estimated to be less than 0.4%. Based on the measuring data, the best efficiency point for the turbine efficiency without aeration is estimated at 93.21% for a specified flow rate of 50.91 m 3 /s and a specified turbine power of 52.53 MW.
In addition, plant efficiency is evaluated by considering generator and water way efficiencies in addition to turbine efficiency which has the main effect in order to seek optimal operation condition of the hydropower plant.

영어초록

The field efficiency test for a hydropower plant where a Franics hydraulic turbine is installed has been carried out by thermodynamic method usually used for the high head hydraulic turbine over 100 m. During the testing, the loss of hydraulic energy converted to thermal energy is measured by a precise thermometers with accuracy of 0.001K to estimate the efficiency.
In order to measure the water temperatures on the low-pressure measuring section in the draft tube, two perforated pipes were used per draft tue outlet. Three thermometers were installed in these perforated pipes in each draft tube outlet. On the high-pressure measuring section at the casing inlet, 2 opposite thermometers were installed to obtain the inflowing water temperature. The field test was conducted for total 39 cases while adjusting the power output from max. 52.0 MW to min. 19.2 MW. Error analysis of the test results confirmed that the max. absolute uncertainty of turbine efficiency is 0.73% and repeatability is estimated to be less than 0.4%. Based on the measuring data, the best efficiency point for the turbine efficiency without aeration is estimated at 93.21% for a specified flow rate of 50.91 m 3 /s and a specified turbine power of 52.53 MW.
In addition, plant efficiency is evaluated by considering generator and water way efficiencies in addition to turbine efficiency which has the main effect in order to seek optimal operation condition of the hydropower plant.

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