ABB 151X1215DC29SA01 SCR specification is available from stock

The 151X1215DC29SA01 May be the model of ABB’s excitation thyristor components, which are mainly used in industrial fields such as power generation.
For example, this type of component is included in the electrical Secondary 1A repair spare parts plan of Tonghua Power Generation Company.
Excitation system is an important part of synchronous generator, in which the excitation SCR component plays the role of controlling and regulating the excitation current to ensure the normal operation of the motor and other equipment. Excitation SCR components are usually part of the excitation system and are used to control and regulate the excitation current of a synchronous generator. The following is the working principle of general excitation SCR components:
The excitation of the excitation system is mainly completed by the initial excitation current. The synchronous generator will produce a certain residual output voltage after rotation driven by the prime mover, when the residual voltage is low, can not guarantee the synchronous generator self-excitation, must rely on the initial excitation current to provide additional excitation for the excitation winding, to establish a magnetic field.
In the excitation system, the excitation SCR module usually constitutes a three-phase fully controlled bridge rectifier circuit. By controlling the on-angle of the thyristor, the DC voltage of the rectifier output can be changed, so that the excitation current can be adjusted.
The specific working process is as follows: First, it is necessary to measure the output voltage or other relevant parameters of the generator. The measurement signal is sent to the control unit and compared with a given reference value. According to the comparison result, the control unit generates the corresponding control signal to adjust the trigger pulse of the thyristor.
The synchronization signal is used to ensure that the thyristor is conducting at the correct phase of the AC power supply. The phase of trigger pulse determines the conduction Angle of thyristor. When the conduction Angle increases, the output DC voltage increases, the excitation current increases, the generator magnetic field is enhanced, and the output voltage of the generator is increased. On the contrary, when the conduction Angle decreases, the excitation current decreases, the magnetic field weakens, and the output voltage of the generator decreases.
In this way, by constantly detecting and comparing the operating state of the generator, the control unit adjusts the trigger pulse of the thyristor in real time, so that the output voltage or reactive power and other parameters of the generator are stable within the set range to meet the requirements of the system.
In addition, the excitation system usually has a variety of protection functions, such as overvoltage protection, overcurrent protection, etc., to ensure the safe operation of the excitation system and the generator. At the same time, in order to improve the reliability of the system, some excitation systems will also use redundant design or standby excitation.