Transformer core materials generally include copper wire and aluminum wire. The advantages and disadvantages of aluminum wire transformers are analyzed as follows:
1. Mechanical properties: copper wire is better, aluminum wire is worse;
2. Mechanical strength: aluminum coils are worse than copper coils, aluminum wires are easy to break, and the coils are easily washed out;
3. The aluminum wire core transformer has poor short-circuit capability;
4. Thermal stability: aluminum wire is inferior, the maximum temperature of aluminum wire is lower than that of copper wire, and aluminum coil is easy to burn;
5. Impact resistance: The welded joints of aluminum coil transformers are easily burnt under the impact of lightning and current, which can easily cause overheating;
6. Aluminum materials are easy to oxidize and cause corrosion;
Seven, aluminum coil transformers mostly use copper-aluminum welding wire welding or copper-aluminum joints to connect the windings and leads. The mechanical strength of the connection is poor and the welding process is more complicated. The connection is easy to be disconnected after severe vibration, and the connection is prone to chemical reaction after long-term operation. Causes the resistivity to increase and local overheating occurs;
8. Production cost: aluminum wire is low, copper wire is high;
9. For epoxy cast dry-type transformers, since the coefficient of thermal expansion and contraction of aluminum is closer to that of epoxy resin than copper, the crack resistance of aluminum coils is better than that of copper coils;
10. Aluminum wire transformer is light in weight and convenient to transport.
