The paper describes the results of performance tests and enthalpy drop tests for a large scale turbine of power plant. The objectives of performance test is to exactly evaluate the degradation of the steam turbine generator in order to provide plant information to help performance engineers identify problems, improve performance, and make economic decisions about scheduling maintenance and optimizing operation. To see the performance changes, thermal performance calculation modelling has developed. We can obtain the detailed performance calculation methods for turbine cycle, based on the reference of ASME PTC. And also the enthalpy drop test has been carried out. The technical and economical assessment for each turbine section is analyzed based on the result of turbine enthalpy drop test By comparing the performance changes throughout the operation period, we confirmed the performance reliabilities of the turbine and its conditions.

Abstract
 1. 서론
 2. 자료 수집 및 시험 방법
  2.1 측정자료 수집
  2.2 터빈 열소비율 계산
  2.3 엔탈피 강하율 계산 방법
 3. 분석 결과
  3.1 터빈 열소비율
  3.2 터빈 엔탈피 강화 효율
 4. 결론
 참고문헌

• 김광홍(한수원 중앙연구원 NRC-DC팀) | Kwang-hong Kim
• 하체웅(한수원 중앙연구원 NRC-DC팀) | Che-wung Ha