An excitation circuit and device for a synchronous generator

Abstract

The invention relates to a novel excitation circuit for a synchronous generator. When the generator is excited, the switch S of the excitation circuit is turned on, and the voltage of the excitation power source Eb is sent to the rotor excitation circuit UE of the generator, so as to generate electricity. The machine obtains the initial excitation current, and the machine end excites the AC voltage. The Ua, which is depressurized by the secondary end of the rectifier transformer, is added to the rectifier BR through the first and second terminals. After rectification, the DC is input to the rotor excitation circuit UE. In the process, the generator voltage increases, which is a positive feedback process. When the secondary terminal voltage Ua of the rectifier transformer increases enough to enable the AVR to start working, the thyristor SCR rectification can be triggered, and the loop is automatically transferred to the thyristor rectifier. In the normal excitation mode, the excitation circuit is also automatically disconnected at this time, and the excitation is completed. By introducing an external excitation power source BT, the generator excitation and voltage building process can be completed quickly and reliably.

Description

technical field [0001] The invention belongs to the technical field of synchronous generator equipment, and relates to an excitation circuit and a device for a synchronous generator. Background technique [0002] After the AC synchronous generator set is driven by the prime mover, a certain initial DC current must be sent into the generator excitation circuit to establish a magnetic field, so that the generator output voltage can be gradually increased to reach the rated value of the generator voltage. This process is called To motivate. [0003] There are two ways to start the generator, one is the other excitation type, that is, the external power supply (specially set excitation power supply and circuit) is used to supply enough excitation current; the other is the residual voltage type, which uses the residual voltage of the generator's residual magnetism. voltage, the initial excitation current is generated, the electricity is increased, and the process of excitation a...

AI Technical Summary

Problems solved by technology

However, the residual magnetism of low-voltage generators sometimes disappears. At the same time, the excitation circuit is relatively complicated, and it is also a part with a relatively high failure rate in the electrical system of the generator.

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