Đang chuẩn bị liên kết để tải về tài liệu:
Governing Fundamentals and Power Management phần 3

Các bộ phận chính của một thống đốc cơ khí thủy ballhead là: • Speeder mùa xuân • Lực đẩy Vòng bi • Flyweights • Thí điểm Van pit tông • Van thí điểm Bushing • Bơm dầu • Quy chế áp suất dầu • Servo (Power) Piston • Bồi thường • Ổ trục | Manual 26260 Governing Fundamentals and Power Management Figure 3-3. Compensated Governor Schematic The Droop Curve Droop is a straight line function with a certain speed reference for every fuel position. Normally a droop governor lowers the speed reference from 3 to 5 of the reference from no load to full load Thus a 3 droop governor with a reference speed of 1236 rpm at no load would have a reference speed of 1200 rpm at full load. If the linkage is changed altering the amount of governor output shaft travel from no load to full load the droop must be reset. Be sure to use a least 2 3 of the governor output shaft travel to ensure stability and allow sufficient droop range adjustment. Uses Of Droop Isolated Unit Most governors are capable of operating in the isochronous mode However droop operation is necessary for many applications. Woodward 15 Governing Fundamentals and Power Management Manual 26260 Figure 3-4. Comparison of 3 Droop Speed Settings for 50 and 100 Load Figure 3-5. 3 and 5 Droop Curves Isolated single-engine applications can operate in either isochronous or droop. In single engine applications the engine operation is not affected by any other engines or the utility. In isochronous operation the speed returns back to the original speed after a load has been applied up to 100 load. In droop operation the speed decreases by a set percentage after a load has been applied. In the droop mode if the original speed is desired the operator must raise the speed setting to return to the original speed when a load is applied. Isolated Systems An isolated system is an application where two or more engines are driving a common load. This load could be electrical generators pumps ship propellers or combinations of these and any other mechanical loads. These isolated systems are not connected to any other systems or to a utility. Without some form of isochronous load sharing scheme like the electronic isochronous load sharing control droop must be used to share .