Excitation system is an indispensable part of power station equipment. The excitation system includes an excitation power supply and an excitation device, and the main body of the excitation power supply is an exciter or an excitation transformer; According to different specifications, models and application requirements, the excitation device consists of regulating screen, control screen, demagnetization screen and rectifier screen.
The purpose of excitation device is to maintain the terminal voltage of synchronous generator at a given level when the power system works normally, and at the same time, it also has the function of forcibly increasing, decreasing and de-magnetizing. It also has rectification function for excitation transformer as excitation power supply. The excitation device can be provided separately, and can also be used as a supporting power supply for power generation equipment.
Extended data:
According to the different excitation modes of DC motor, it can be divided into separate excitation, parallel excitation, series excitation and compound excitation. In the process of DC motor rotation, excitation is to control the stator voltage to change the magnetic field, change the speed of DC motor, and change the excitation also plays a role in changing the speed.
The generator consists of two parts.
(1) Rotor -DC acts on the rotor winding to generate the magnetic field of the generator;
(2) Stator-The stator winding is cut by the magnetic force of the magnetic field, and a current is generated (emitted) in the stator winding. For alternator, the generator rotor is driven by prime mover (water turbine, steam turbine, diesel engine, etc.). ), so the magnetic field generated by the rotor winding is rotating, and the relative motion of the stationary stator winding cuts the magnetic field lines.
Baidu Encyclopedia-Generator Excitation System