In the chemical industry where the rectification becomes most common, the high-power rectifier devices also have low secondary voltages and large currents. Therefore, they are similar to the electric furnaces in many aspects. That is, the structural features mentioned above and the rectifier transformers are also available. The biggest characteristic of the rectifier transformer is that the secondary current is not a sinusoidal AC. Due to the unidirectional conduction characteristics of the subsequent rectifier components, each phase line is no longer at the same time, but the current is a load current but soft current conduction, and the unidirectional pulsating current is changed by the filtering 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 rectification circuit and the rectification circuit of the double-reverse-belt balancing reactor, which is required for the same DC output voltage and current. The secondary voltage and current of the rectifier transformer are not the same, so the parameter calculation of the rectifier transformer is based on the premise of the rectifier line, and the general parameter calculation is calculated from the secondary side to the primary side.
Since the rectifier transformer winding current is non-sinusoidal and contains many high-order harmonics, in order to reduce the harmonic pollution to the power grid, in order to increase the power factor, the pulse wave number of the rectifier equipment must be increased, which can be solved by a phase shift method. The purpose of phase shift is to make a phase shift between the voltages of the same name of the secondary winding of the rectifier transformer.
Rectifier transformers are widely used in various industries and are mainly divided into lighting, machine tool appliances, mechanical and electronic equipment, medical equipment, and rectifier devices. Product performance can meet all kinds of special requirements of users. The electrochemical industry is the industry that applies the most of the rectification, electrolysis of non-ferrous metal compounds to produce aluminum, magnesium, copper and other metals; electrolysis of salt to make chloralkali; electrolysis of water to make hydrogen and oxygen.