Widely used in lighting, machine tool appliances, mechanical and electronic equipment, medical equipment, rectifier devices, etc. Product performance can meet various special requirements of users.
Electrochemical industry
This is the industry that uses rectifiers the most. It electrolyzes non-ferrous metal compounds to produce aluminum, magnesium, copper and other metals; electrolyzes table salt to produce chlor-alkali; and electrolyzes water to produce hydrogen and oxygen.
DC power supply for traction
DC grid for mining or urban electric locomotives. Since the valve side is connected to overhead wires, there are many short-circuit faults, the DC load changes with a large amplitude, and the electric locomotives are often started, resulting in varying degrees of short-term overload. For this reason, the temperature rise limit and current density of this type of transformer are both low. The impedance is about 30% larger than the corresponding power transformer.
DC power supply for transmission
It is mainly used to power DC motors in electric transmission, such as the armature and excitation of steel rolling mills.
For DC transmission
The voltage of this type of rectifier transformer is generally above 110kV, and the capacity is tens of thousands of kilovolt-amperes. Special attention needs to be paid to the AC and DC addition issues to the ground insulation. In addition, there are DC power supplies for electroplating or electrical processing, DC power supplies for excitation, DC power supplies for charging and electrostatic precipitating, etc.
In the chemical industry where rectifier transformers are most used, high-power rectifier devices also have low secondary voltage and large current. Therefore, they are similar to electric furnace transformers in many aspects. That is, the structural characteristics mentioned above are also possessed by rectifier transformers. The biggest feature of the rectifier transformer is that the secondary current is no longer a sinusoidal alternating current. Due to the unidirectional conduction characteristics of the subsequent rectifier components, each phase line no longer has a load current flowing at the same time but conducts soft current. The pulsating current in one direction is transformed by the filter device. For DC, the secondary voltage and current of the rectifier transformer are not only related to the capacity connection group, such as the commonly used three-phase bridge rectifier line, double inverse rectifier line with balanced reactor, the rectification required for the same DC output voltage and current The secondary voltage and current of the transformer are different, so the parameter calculation of the rectifier transformer is based on the rectifier line. Generally, the parameter calculation is calculated from the secondary side to the primary side.
Since the rectifier winding current is non-sinusoidal and contains many high-order harmonics, in order to reduce harmonic pollution to the power grid and improve the power factor, the pulse number of the rectifier equipment must be increased, which can be solved by phase shifting. The purpose of phase shifting is to create a phase shift between the voltages at the same end of the secondary winding of the rectifier transformer.
