To introduce the application of a kind of fully digital giant power
AC frequency converter based on the current source DC link converter for the main drive of
wire rod finishing block in wire rod and bar continuous rolling mill production line and describe its configuration, function, operating principle and characteristics. Adoption of this kind of frequency converter simplifies the course of engineering design, installation and commissioning, improves the control performance and operating reliability of the electrical equipment and ensures the quality of products.Key words giant power AC frequency converter; vector control; load commutationcantly enhances its sensitivity. First redox
mediator is directly present in the sensing electrode graphite layer. The second redox mediator and the enzymes (
cholesterol esterase, cholesterol oxidase and horseradish peroxidase) with other necessary stabilizer and non reactive reagents are present in a highly water absorbing cellulose matrix. An applied voltage of -125mV provides added sensitivity and precision. The cholesterol biosensor only requires one drop of blood (≥25μl). Red blood cells are excluded by a blood separation membrane allowing only plasma to penetrate into the reaction center. Test results are displayed on an electronic meter after 60 s. This biosensor can directly measure cholesterol at the level range of 2～10 mmol/L (90～400mg/L),covering normal and abnormal ranges in humans. The handheld, battery operated compact unit is specifically designed for ease carry and commercialization and will benefit to the Coronary Risk Assessment Program for the general public.
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