Oil cooled thyristor power supply (rectifier)

Product Introduction:

The oil cooled thyristor rectifier adopts three-phase AC power supply and is transformed into a rectifier device with adjustable size and the ability to change the direction of DC output voltage and current arbitrarily. Adopting a fully oil immersed air self cooling system, it addresses the damage caused by corrosion to the equipment and increases the heat dissipation surface area of the fuel tank. Removing water cooling solves the tedious application of circulating water and the strict requirements for water pressure and scale (the problem of blockage of waterways caused by scale due to the quality of water). Other DC power sources similar to those used are suitable for harsh environments such as electroplating, electrolysis, and electrochemistry.

Working Principle:

1. The three-phase 380V AC power supply of the main circuit is controlled by an air switch and AC contactor to turn off and overcurrent protection circuit, which controls the power supply of the whole machine. The protection signal can be used to control the AC contactor to turn on and off, forming the whole machine protection and zero power consumption in the shutdown state. Then, the AC power supply is sent to the primary side of the rectifier transformer. The alternating magnetic field generated by inductive coupling forms a six phase AC voltage in the isolated secondary winding, which enters the three-phase fully controlled bridge thyristor rectifier circuit and filter circuit composed of thyristor filter reactors. The thyristor is controlled by the thyristor trigger circuit to make the output DC voltage infinitely adjustable, and the low ripple DC power generated is provided to the load.

2. The control unit consists of a self-locking circuit composed of AC contactors and control buttons to control the on/off of the power supply, and an overcurrent protection circuit composed of current transformers, current relays, and relays to control the main AC contactor, forming a complete on/off protection control unit.

3. The core circuit of the trigger control unit is composed of KCD-3MC dedicated integrated trigger circuit board designed and produced by our company. Using the German Siemens specialized integrated circuit TCA785, the given signal and feedback signal are compared through a PI regulated operational amplifier circuit and processed by TCA785 to provide accurate trigger signals to the thyristor, including functions such as current stabilization, voltage stabilization, soft start, phase loss protection, and overvoltage/undervoltage protection.

Technical Specifications：