大型混流式水轮机非接触式导叶位置检测装置的改进设计OA

To meet the demands of power system load changes,the governor of a hydraulic turbine unit needs to adjust the unit output power by regulating the guide vane opening.Inaccurate guide vane position detection af-fects the stable operation of the unit.Taking a hydropower plant as an example,this paper analyzes that the hardware configuration and switching logic of the original governor guide vane displacement sensors in units 2#to 6#do not meet the relevant requirements,and problems exist such as insufficient rigidity of the measurement structure and poor vibration resistance.A design scheme for a novel non-contact guide vane position detection device is proposed.A fixing bracket is installed on the servomotor to fix the main body of the displacement sen-sor.The slider,which generates an inductive signal with the sensor body,is connected to the push-pull rod of the servomotor via a T-shaped moving bracket and is arranged directly above the sensor body.This achieves ze-ro constraining force between the push-pull rod and the slider,enables more flexible adjustment of the slider po-sition,alleviates the fracture problem between the connecting rod and the universal joint caused by constraining forces,and improves the service life of the displacement sensor.In addition,this design adds guide vane dis-placement sensor 3 and a"one-to-two"module,sends the signal of guide vane displacement sensor 3 into PCC sets A and B respectively,and modifies the PCC control program to constitute a"two-out-of-three"selection method for the guide vane opening signal,thereby overcoming the problem of insufficient logic switching.After this novel non-contact guide vane position detection device is put into operation,it optimizes the functional hard-ware configuration and control logic of the governor control system in the hydropower plant,meets the technical specifications and anti-accident measure requirements,and ensures the safe and reliable operation of the unit.The design and application of this novel non-contact guide vane position detection device provide good reference and promotion significance for the subsequent unit technical modification of cascade hydropower plants.