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Governor in hydroelectric generator unit
Author: source: date: 2019-08-28 10:26:07
We often see many different types of governors for our customers' quotations, because we will calculate how much work the turbine needs to do according to the customer's head, flow and diameter of the runner to push the turbine's thrust ring. And design the appropriate governor type for this turbine. And professionally equipped for customers.
1 IntroductionThe turbine governor is one of the important auxiliary equipment in the hydro-generator set. A hydro-generator set refers to one or more devices, including adaptive turbines and response control mechanisms and indicators. According to the detection of the hydroelectric generating set, the speed deviates from the switching control turbine flow. The turbine guide mechanism adjusts the speed and output. The turbine governing system is a closed loop system consisting of a controller, a hydraulic servo system and an adjustment object. Typically, turbine governors are collectively referred to as controllers and hydraulic servo systems.
The function of the turbine governor is to control the turbine by controlling the amount of operating oil of the guide vane (blade relay) relay to control the opening of the guide vane (blade) and then control the flow of the turbine. The speed of rotation, that is, the role of adjusting the speed of the turbine.
The turbine governor can be divided into a single-regulating governor and a dual-regulating governor according to the adjustment object, which is commonly known as the monotonic governor and the dual-regulating governor. It can also be divided into mechanical governors according to the adjusting components (ie ST And ) type), electric governor (DST type and DT type), microcomputer governor (ie WST type and WT type), etc., can also be further subdivided into centrifugal flying pendulum, ring spray, stepper motor , hydraulic valves, direct connections, plate pipes, tubes, etc.
The working principle of the turbine governor basically compares the speed signal (unit frequency) with the grid frequency (given frequency), and gives the electro-hydraulic converter a signal (command) to operate the relay on or off according to the difference. Controlling the flow of water through the turbine to adjust the speed of the turbine.
2. What are these functions of the turbine governor:A. The speed of hydropower can be automatically adjusted to operate within the allowable deviation rated speed range to meet the grid frequency quality requirements.
B. Quickly or manually start the hydro-generator set to accommodate the increase or decrease of the grid load, as well as the need for normal or emergency shutdown.
C. When it is operated in parallel with the hydroelectric generator in the power system, the governor can automatically arrange the load distribution and make each unit economically operate.
What is the working principle of the turbine governor?
By comparing the speed signal (frequency unit) with the grid frequency (for a given frequency), the governor provides an electro-hydraulic converter with an on/off operation signal relay (command) to control the turbine water flow based on the difference. The adjustment of the turbine speed is achieved in this way.