The main characteristics of the generator

A generator is a mechanical device that converts other forms of energy into electrical energy. It is driven by hydraulic turbines, steam turbines, diesel engines, or other power machinery. It converts the energy from water flow, gas flow, fuel combustion, or nuclear fission into mechanical energy for transmission to generators. The generator is converted to electrical energy. Generators have a wide range of uses in industrial and agricultural production, national defense, technology and daily life.

1, no-load characteristics:

When the generator is not connected to the load, the armature current is zero and it is called no-load operation. At this moment, the three-phase winding of the stator of the motor only has the no-load electromotive force E0 (three-phase symmetry) induced by the excitation current If, and its size increases with the increase of If. However, due to saturation of the magnetic core of the motor, the two are not proportional to each other. The curve reflecting the relationship between no-load electromotive force E0 and field current If is called the no-load characteristic of the synchronous generator.

2. Armature reaction:

When the generator is connected with a symmetrical load, the three-phase current in the armature winding will generate another rotating magnetic field, which is called the armature reaction magnetic field. Its rotation speed is exactly equal to the rotation speed of the rotor, and both rotate synchronously.

3, load operating characteristics:

Mainly refers to the external characteristics and adjustment characteristics. The external characteristic is the relationship between the generator terminal voltage U and the load current I when the speed is rated, the excitation current and the load power factor are constant. The adjustment characteristic is the relationship between the excitation current If and the load current I when the speed and terminal voltage are rated and the load power factor is constant.