First, the role:
Transformers are mainly used in power transmission and distribution systems. The application of high voltage transmission can not only reduce the cross-sectional area of transmission lines and save the introduction of manpower and material resources, but also reduce the power loss of transmission lines. Transformers can also be used to change current, transform impedance and generate pulse current. Among the three working modes of rectification, countercurrent and frequency conversion, rectification is the most widely used one. 1. Electrochemical industry? This is the industry that uses rectifier transformers the most, producing aluminum, magnesium, copper and other metals by electrolysis of non-ferrous metal compounds; Electrolytic salt production to chlor-alkali; Electrolyzing water produces hydrogen and oxygen. 2.DC traction power supply is used for mine or urban electric locomotives in DC power grid. Because the valve side is connected with overhead lines, there are many short-circuit faults, the DC load changes greatly, and the electric locomotive is often started, resulting in different degrees of short-term overload. Therefore, the temperature rise limit and current density of this transformer are low. The impedance is about 30% larger than that of the corresponding power transformer. 3. DC power supply for transmission is mainly used for power supply of DC motor in electric transmission, such as armature and excitation of rolling mill. Fourth, DC transmission.
Another very important role is to protect personal safety! Isolate dangerous voltage. ? Isolation means that the primary and secondary windings of the transformer are electrically insulated. The isolation of transformer is to isolate the current of primary and secondary windings respectively. There are many kinds of isolation. For low-voltage transformers, insulating paint is mainly coated on the outside of the metal winding, and then the primary winding and the secondary winding are wound around a brake core to form the transformer. Many people call the wire used for winding the coil of this transformer "enameled wire". The reason is the insulating paint. At this time, the original secondary side was insulated by the paint, that is, isolated. Autotransformer is used in occasions where primary and secondary isolation are not needed, which has the advantages of small volume, less consumables and high efficiency.
Second, the performance characteristics:
(1) stable electrical performance: the product combines the load characteristics, grid voltage fluctuation and atmospheric overvoltage, and determines a reasonable and reliable insulation level and insulation model according to the load of the rectifier transformer to fully ensure the reliability and stability of the electrical performance of the product. The environmental safety factor of the product is ≥ 1.67.
(2) High dynamic stability: the winding of the product has high mechanical strength and strong anti-sudden ability, which can meet the extremely harsh load environment. In the process of design and manufacture, the possible sources of dynamic instability caused by transformer magnetic leakage or abnormal transportation are well eliminated. This product has high dynamic stability. High impedance, which is 30% higher than that of power transformer with the same capacity, suppresses di/dt and effectively protects rectifier elements.
(3) Good thermal stability: advanced product design, strictly control the temperature rise of heating parts and the hottest spots of products, and leave enough temperature rise margin. When necessary, the axial oil passage can be added to the coil, the cooling mode can be selected according to the load loss value of the coil, and the oil flow can be reasonably distributed to achieve the best cooling effect. The main temperature rise index is at least 5℃ lower than the national standard. The coil and lead are made of copper wire, and the current density is low.
(4) Strong overload capability: the product has strong overload capability and overvoltage capability, and can run safely under rated load and full load for a long time at 1 10% overvoltage (ambient temperature 40℃); The terminal connected between the transformer and the motor can withstand 1.5 times the rated current for 5S. The product design and manufacture fully consider the load characteristics, and meet the overload requirements from the aspects of temperature rise, insulation performance and accessory selection.
(5) Excellent performance index: the designed and manufactured value of no-load current is lower than the national standard value of S9 series transformers with the same capacity, which fully guarantees the economy and reliability of users.
(6) obvious power saving effect and low noise (
(7) Simplified structure and beautiful appearance; The oil tank adopts anti-leakage design technology to prevent the oil tank from leaking.
I have told you all about the function and performance characteristics of rectifier transformer. My knowledge and experience can only give you so much knowledge and information. If you are interested in other aspects of rectifier transformer, you can look up some information yourself and get a deeper understanding. Finally, I would like to add a point to you, that is, the structure of rectifier transformer, which is mainly composed of iron core, winding, body and oil tank. I hope the above information can help you.
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