Flow measurement using the pressure-time (Gibson) method typically involves mounting instrumentation on the outside of the penstock. In the case of a plant where the penstock is embedded in concrete, an innovative approach that involved installing instrumentation inside the penstock provided results with an acceptable degree of accuracy.rnComision Federal de Elec-tricidad (CFE) in Mexico owns 14 large hydroelectric facilities. These facilities contain 60 turbine-generator units ranging in size from 50 to 350 MW. Many of these units have operated for more than 20 years, and efficiency likely decreased due to normal wear (such as abrasion or cavitation-erosion). To assess the efficiency of its generating units and to determine any work needed, CFE decided in early 2004 to undertake a research project.
展开▼
