The cooling system of the power transformer consists of two parts: the internal cooling system, which ensures that the heat of the winding and the iron core is dissipated into the surrounding medium; the external cooling system, which ensures that the heat in the medium is dissipated to the outside of the transformer. According to the size of the transformer capacity, the medium and the type of circulation, the transformer adopts different cooling methods.

The transformer is a static device in continuous operation, which is relatively reliable in operation and has less chance of failure. However, since most of the transformers are installed outdoors, and are affected by the load during operation and the short-circuit fault of the power system, various faults and abnormal situations inevitably occur during operation.

1. What are the consequences of different connection groups for parallel operation of transformers?
Answer: When transformers of different connection groups are operated in parallel, the secondary circuit will generate voltage difference due to different secondary side voltages of transformers Δ U2, because the total phase difference in transformer connection is a multiple of 30 ° Δ The value of U2 is large. If the phase angle difference of the secondary side of the parallel transformer is 30 °, Δ The U2 value is 51.76% of the rated voltage. If the short-circuit voltage Uk of the transformer is 5.5%, the equalizing current can reach 4.7 times of the rated current, which may burn the transformer.
A large phase difference produces a large equalizing current, which is not allowed. Therefore, transformers of different groups cannot operate in parallel.

During construction, dry transformer and oil transformer can be selected according to the space. Oil transformer can be selected when the space is large, and dry transformer can be selected when the space is crowded.

1. Winding failure
There are mainly inter-turn short circuit, winding grounding, phase-to-phase short circuit, wire breakage and joint welding. The reasons for these failures are as follows:
① During manufacture or maintenance, local insulation is damaged, leaving defects;
② Due to poor heat dissipation or long-term overload during operation, sundries fall into the windings, causing the temperature to be too high and the insulation to age;
③ The manufacturing process is poor, the pressing is not tight, the mechanical strength cannot withstand short-circuit impact, and the winding is deformed and the insulation is damaged.

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High speed spacer slitting line
Swing Cut To length line

The short-circuit current breaking capacity of the low-voltage side circuit breaker of the distribution transformer is too small; the influence of the thermal stability current of the cable is not verified in the low-voltage distribution system, which leads to the small cross-sectional area of some distribution circuit cables in the low-voltage distribution system.

CANWIN The third-generation transformer core processing center was put into production as planned, and 10 sets of finished machines will be gradually put into the market!
The third-generation machine adopts the mode of one shear and four punches, that is, the swing shear is used as the main shearing machine, which can cut angles of 45 degrees, 90 degrees, and 135 degrees, and can switch the angle during high-speed shearing;
Four punches refer to two sets of V-shaped punches that can move laterally, and two sets of O-shaped punches that can move laterally and longitudinally at the same time. Action synthesis, one action is complete!
The silicon steel sheet limit track of the third-generation machine adopts open track design, and the limit bearing adopts ceramic bearing, which is more convenient to clean and use;
In addition, the third-generation machine also adopts the magnetic belt tension feeder uniquely designed by CANWIN, which is even better in details!

At present, all countries in the world generally adopt the transformer core shearing distribution mode, which is also a relatively advanced industrial chain service mode that my country has been paying attention to and learning from. In recent years, with the development of my country's intelligent manufacturing technology, the progress of transformer core intelligent manufacturing technology and the outbreak of new coronary pneumonia have further promoted this progress.

This video showed you what a main power transformer look like.

Driven by scientific and technological innovation, Keying Electric leads the power transformer field into the deep water area of high quality, intelligent and large-scale manufacturing.