What is the difference between rectifier transformer and power transformer
Writer： Hengfeng you electric Time：2023-03-27 views：times
1、 What is rectifier transformer
Current conversion is the general term of three working modes: rectification, countercurrent and frequency conversion, among which rectification is the most widely used. The characteristic of rectification equipment is that the input AC is output into DC after rectification and filtering. Rectifier transformer is the power transformer of rectifier equipment. Most industrial rectifier DC power supplies are obtained by rectifier transformer and rectifier equipment.
2、 What is a power transformer
Power transformer generally refers to the transformer that supplies power to the electric drive system. Most of the transformers in the power grid are power transformers.
3、 Difference between rectifier transformer and power transformer
(1) Functional differences
Functions of rectifier transformer: 1. Supply proper voltage to rectifier system; 2. It is to reduce the pollution of power grid caused by waveform distortion caused by rectifier system.
The output of rectifier transformer is still AC, which only provides power for rectifier equipment. Usually, the primary side is connected into a star shape, and the secondary side is connected into an angle shape, which is used to suppress high-order harmonics. The angular neutral point on the secondary side is not grounded. When the rectifier equipment is grounded at one point, it will not cause equipment damage, and the grounding fault alarm signal will be sent through the grounding detection equipment. 1、 Shielding isolation is added between the secondary.
Rectifier transformers are mainly used in the fields of electrolysis, smelting, excitation, transmission, cascade speed regulation, electrostatic precipitation and high-frequency welding. There is a little difference in structure. In order to make the waveform smooth, some rectifier transformers for electrolysis are made into six phase output, and the six phase rectifier bridge is added outside to get a relatively smooth waveform. According to the current waveform characteristics and anti harmonic requirements of silicon controlled rectifier circuit for smelting and high-frequency welding, the eddy current loss in rectifier transformer winding and stray loss in structural parts are optimized for some data and processes. In fact, the general structure is also similar.
The power transformer is usually grounded at the neutral point of y/y connection (providing single-phase power supply). If it is used for rectifier equipment, the rectifier equipment will be damaged in case of ground fault, and its ability to suppress high-order harmonics generated by rectifier equipment is also poor.
(2) Different uses
The transformer used as the power supply of rectifier is called rectifier transformer. Most of the rectifying DC power supplies used in industry are obtained from the AC power grid through the rectifying equipment composed of rectifying transformers and rectifiers. In today's highly modern society, its great use can be seen directly or indirectly in almost every field. Power transformer is mainly used for power system, daily lighting and factory power. The main uses of rectifier transformer are as follows:
1. Electrochemical industry;
2. DC power supply for traction;
3. DC power supply for transmission;
4. DC power supply for DC transmission;
5. DC power supply for electroplating or electrical processing;
6. DC power supply for excitation;
7. DC power supply for charging;
8. DC power supply for electrostatic precipitator;
3、 Output voltage difference
(1) Differences in address
Due to the close combination with the rectifier, the output voltage of the rectifier transformer is called the valve side voltage, and its name comes from the unidirectional conductivity of the diode.
(2) Differences in calculation methods
Due to the different waveforms of the load current of the rectifier, the calculation method of its output current is not only very different from that of the power transformer, but also different for different rectifier circuits.
4、 There are differences in design and manufacturing
Due to the difference between rectifier transformer and power transformer in use, it is also very different from power transformer in design and manufacturing: considering the working condition of rectifier transformer, rectifier transformer has achieved low current density and magnetic flux density, and slightly higher impedance. In terms of the winding structure, the valve side sometimes requires two windings to supply forward and reverse transmission or forward transmission and reverse braking respectively. When braking, the converter is in the inverter working state; If the transformer has harmonic requirements, a shielding layer with grounding terminals shall be placed between the windings; Adopt various measures such as strengthening the pressing plate and brace, enlarging the oil passage, etc. to improve the ability of winding to resist short circuit; In addition, there is usually a larger margin in terms of heat dissipation than that considered in the design and manufacture of power transformers.
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