Transformer has a variety of functions and efficiency. It is an important electrical equipment for transformer, and it should also pay attention to the design of relevant parameters in the process of use. What are the common technical parameters of transformer? How is it regulated? The following are the common technical parameters of transformers for your reference:

A. Rated capacity (kVA): the capacity that can be transmitted under continuous operation at rated voltage and current.

B. Rated voltage (kV): the working voltage that the transformer can withstand when it operates for a long time In order to meet the needs of grid voltage changes, the high-voltage side of the transformer has tapping, and the output voltage at the low-voltage side can be adjusted by adjusting the number of turns of the high-voltage winding

C. Rated current (a): the current that the transformer can pass for a long time under the rated capacity

D. No load loss (kw): the active power absorbed when the rated voltage at the rated frequency is applied to the terminal of one winding and the other windings are open circuit. It is related to the performance and manufacturing process of iron core silicon steel sheet and the applied voltage

E. No load current (%): when the transformer has no load on the secondary side under the rated voltage, the current passing through the primary winding is generally expressed as a percentage of the rated current

F. Load loss (kw): short circuit the secondary winding of the transformer and connect the rated current at the rated tapping position of the primary winding. At this time, the power consumed by the transformer

G. Impedance voltage (%): short circuit the secondary winding of the transformer and slowly increase the voltage in the primary winding. When the short-circuit current of the secondary winding is equal to the rated value, the voltage applied on the primary side at this time is generally expressed as a percentage of the rated voltage

H. Phase number and frequency: the beginning of three phases is indicated by s, and the beginning of single phase is indicated by D. Chinese national standard frequency f is 50Hz. Countries with 60Hz abroad (such as the United States).

1. Temperature rise and cooling: the difference between the transformer winding or upper oil temperature and the temperature of the surrounding environment of the transformer is called the temperature rise of the winding or upper oil surface The winding temperature rise limit of oil immersed transformer is 65K, and the oil surface temperature rise is 55k. There are also many cooling methods: oil immersed self cooling, forced air cooling, water cooling, tube type, chip type, etc.

J. Insulation level: there are insulation grade standards. The representation method of insulation level is as follows: the insulation level of transformer with high-voltage rated voltage of 35kV and low-voltage rated voltage of 10kV is expressed as li200ac85/li75ac35, where li200 indicates that the high-voltage lightning impulse withstand voltage of the transformer is 200kV, the power frequency withstand voltage is 85kv, the low-voltage lightning impulse withstand voltage is 75KV, and the power frequency withstand voltage is 35kV The current insulation level of oil immersed transformer products of oaks High Tech Co., Ltd. is li75ac35, which means that the high-voltage lightning impulse withstand voltage of the transformer is 75KV and the power frequency withstand voltage is 35kV. Because the low voltage is 400V, it can be ignored.

K. Connection group label: according to transformer I The phase relationship of the secondary winding connects the transformer winding into various combinations, which is called the connection group of the winding. In order to distinguish different connection groups, clock representation is often used, that is, the phasor of the high-voltage side line voltage is used as the long pin of the clock and fixed on 12, and the phasor of the low-voltage side line voltage is used as the short pin of the clock. To see which number the short pin refers to, it is used as the label of the connection group For example, Dyn11 indicates that the primary winding is (triangle) connected, and the secondary winding is (star) connected with a center point, and the group number is (11) points.

There are many parameters of the transformer. We should constantly understand the common technologies and parameters of the transformer and constantly improve the performance and efficiency of the transformer. In this way, the transformer will play a great role and have greater performance improvement.