Comparison Of Electrical Transformer Wiring Methods

With the current depletion of natural resources in my country, reducing various losses of electrical transformer, improving the operational safety and reliability of transformers and actual work efficiency, and optimizing transformer design have become a hot issue at present.

The advantages of electrical transformer Dd wiring are: There are no major drawbacks of the third harmonic electromotive force and Yy connection method; The balanced line voltage can provide larger three-phase unbalanced loads; For low-voltage transformers that output larger currents, this connection method It is more economical, because each coil of the transformer flows a phase current, and the line current that is √3 times larger than the phase current is output to the user.

The disadvantages of the electrical transformer Dd wiring are: Compared with the Y-shape, more insulation is used, the small cross-section of the wire reduces the ability to withstand mechanical force during short circuit, the neutral point cannot be extracted, and sometimes it cannot meet the requirements of the system and users. In the three-phase transformer group composed of phase transformers, if the voltages of each phase are inconsistent, a circulating current will be generated in the coil, which will affect the efficiency.

The advantages of electrical transformer Dy wiring are: no weak point of unstable neutral voltage, strong single-phase load capacity, no third harmonic voltage and zero-sequence voltage on the lines outside the winding, strong resistance to the secondary side Intrusion lightning overvoltage capability, loss is relatively small.

The disadvantages of electrical transformer Dy wiring are: complex manufacturing process, poor mechanical strength, and high requirements for primary side withstand voltage.