Shenyang Getai Hydropower Equipment Co., Ltd.

What Is A Hydroelectric Generator?

Oct. 19, 2019

A hydroelectric generator is a generator that converts water energy into electrical energy using a turbine as a prime mover. When the water flows through the turbine, the water energy is converted into mechanical energy, and the rotating shaft of the turbine drives the rotor of the generator to convert the mechanical energy into electrical energy for output. It is the main power equipment for the production of electric energy from hydropower stations. So what types of hydroelectric generating sets are there? We can answer for you as a Kaplan Turbine Factory.

First look at the characteristics of the hydroelectric generator.

1. The energy storage power station mainly plays the role of peak filling and valley filling in the power grid, and the unit starts and stops frequently. The structure of the generator motor must fully consider its recurring centrifugal force, causing fatigue to the structural material and thermal changes and thermal expansion on the stator and rotor windings. The stator is often thermoelastically insulated;

2. The fan on the rotor of the conventional hydro-generator used in the reversible generator motor can not meet the requirements of heat-dissipation and cooling, and the peripheral fan is generally used for the large-capacity and high-speed unit;

3. When the thrust bearing and the guide bearing rotate in the forward and reverse directions, the oil film cannot be destroyed;

4. The structure is closely related to the starting mode. When the starting motor is used, a special motor is installed on the coaxial. If the speed of the generator motor needs to be changed, in addition to changing the phase of the power supply, the stator winding needs to be changed and the rotor is pole-changed.

The hydroelectric generating unit refers to a hydroelectric generating device composed of a water turbine, a hydroelectric generator and its ancillary equipment (speed regulating, excitation device). According to the arrangement of the hydro-generator set, there are three types: vertical, horizontal and inclined. Most of the hydro-generator units of the horizontal (ie horizontal axis) installation are suitable for small units and some medium-sized water bucket units; the hydro-generator units for inclined units are mainly suitable for open-section and siphon-flow type The unit and other types of small hydro-generator units with low heads; and the medium- and low-speed large and medium-sized hydro-generator units mostly use vertical (vertical shaft) devices. The hydro-generator units of rural small hydropower stations often connect the turbine main shaft and the generator main shaft through gears, friction wheels and belt drives, while most hydro-generator units use the form of a direct connection between the turbine main shaft and the generator main shaft.

Hydraulic Turbine Generator

Hydraulic Turbine Generator

The type of Hydraulic Turbine Generator is a concise sign of the type and characteristics of the hydroelectric generator. A hydroelectric generator is a generator that converts water energy into electrical energy using a turbine as a prime mover. So what are the installation forms of the hydroelectric generator?

1, horizontal structure

Horizontal-structured hydro-generators are usually driven by an impingement turbine. Horizontal turbines typically use two or three bearings. The structure of the two bearings has a short axial length, a compact structure and convenient installation and adjustment. However, when the critical speed of the shafting system cannot meet the requirements or the bearing load is large, this requires a three-bearing structure. Most of the domestic bedroom turbine generator sets belong to small and medium-sized units. The large horizontal unit with a capacity of 12.5MW is also produced. The horizontal hydro-generator unit produced abroad is not uncommon with a capacity of 60-70MW. The horizontal hydro-generator unit with pumped storage power station has a single unit capacity. Up to 300MW.

2, vertical structure

The hydroelectric generating unit is widely used in vertical structures. Vertical hydroelectric generating units are usually driven by a mixed flow or axial flow turbine. The vertical structure can be divided into suspension and umbrella. The thrust bearing of the generator is located in the upper part of the rotor and is called the suspension type. The lower part of the rotor is called the umbrella type.

3, cross-flow structure

The cross-flow turbine generator set is driven by a cross-flow turbine. A cross-flow turbine is a special type of axial flow turbine with fixed or adjustable rotor blades. Its main feature is that the axis of the wheel is horizontally or slanted and aligned with the flow direction of the turbine inlet and outlet pipes. The cross-flow hydroelectric generator has the advantages of compact structure and light weight, and is widely used in low-head power stations.

Hydrogenerators are mainly used in Hydroelectric Power Plants. The use of hydraulic energy can effectively operate the plant, reducing manpower and improving efficiency.

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