Displacement monitoring device and method for main distributing valve of hydraulic turbine governor

Abstract

The invention relates to a displacement monitoring device and method for a main distributing valve of a hydraulic turbine governor. The displacement monitoring device comprises a PLC controller, an isolation transmitter and a switch, wherein the PLC controller is electrically connected with a magnetostrictive displacement sensor through the isolation transmitter, and the displacement sensor is used for checking a position signal of a limiting plate of the main distributing valve; the PLC is in communication connection with the switch, the switch is in communication connection with the industrial personal computer and the in-situ control unit, and the PLC is powered by the power supply conversion module; and the magnetostrictive displacement sensor is used for being arranged on the side face of a main distributing valve base, and the main distributing valve base is connected with a main distributing valve element. The displacement monitoring device is reasonable in structural design, convenient to install, easy to operate and complete in function, the control safety of the speed regulator is improved, and the risks of unit equipment damage and personnel safety caused by faults of amagnetostrictive displacement sensor of a main pressure distribution valve of the speed regulator or following faults of the main pressure distribution valve are reduced.

Description

technical field [0001] The invention belongs to the technical field of displacement monitoring of a main pressure distribution valve of a water turbine governor, and in particular relates to a displacement monitoring device and method for a main pressure distribution valve of a water turbine governor. Background technique [0002] The main pressure distribution valve is one of the important equipment controlled by the turbine governor, and its action reliability directly affects the adjustment stability of the governor, and even the safe and stable operation of the unit. During the operation of the unit, the turbine governor adjusts the guide vane opening according to the active power signal issued by the unit. The guide vane opening value generally collects the displacement of the servomotor, and is required to be consistent with the actual action of the main pressure distribution valve. If the given value of the guide vane opening is not synchronized with the displacement ...

AI Technical Summary

Problems solved by technology

[0004] (2) Non-contact sensors are susceptible to external factors and cannot reliably measure actual displacement

At present, non-contact sensors are used for monitoring the displacement of the main pressure distribution valve. This sensor has relatively high requirements on the effective sensing distance and is easily affected by electromagnetic interference and vibration. As a result, data jumps often occur when monitoring the displacement of the main pressure distribution valve. Potential hidden dangers to the safe and stable operation of the unit

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