The installation structure of a hydrogenerator is usually determined by the type of the turbine. There are mainly the following types:
　　(1) horizontal structure Horizontal turbine generators are usually driven by impact turbines. Horizontal turbine sets usually use two or three bearings. The two bearings are of short axial length and compact structure. Installation and adjustment is convenient, but when the critical speed of shafting can not meet the requirements or bearing load is large. This requires the use of three-bearing structure. Most of the domestic bedroom turbine generator units belong to small and medium-sized units, and the capacity of 12.5MW large horizontal units are also produced, foreign production of horizontal turbine generator sets. It is not uncommon to have a capacity of 60-70MW, and the single unit capacity of a horizontal hydroelectric generator with a pumped storage power station can reach 300MW.
　　(2) Vertical structure Vertical structure is widely used in domestic hydro-generator sets. Vertical turbine generators are usually driven by Francis or axial flow turbines. Vertical structures can be divided into suspension and umbrella types. The thrust bearings of generators are located in the upper part of the rotor. It's called suspension. The lower part of the rotor is collectively called the umbrella type. 3) tubular structure The tubular turbine is driven by a tubular turbine, a special type of axial flow turbine with fixed or adjustable runner blades. Its main feature is that the axis of the runner is horizontal or inclined. Layout. The tubular turbine generator has the advantages of compact structure and light weight, so it is widely used in low head power stations.