Overview of SBK three-phase dry-type transformer:
Under the specified operating environment and conditions, the main technical data of transformers are generally marked on the nameplate of the transformer. Mainly including: rated capacity, rated voltage and its tap, rated frequency, winding connection group, rated performance data (impedance voltage, no-load current, no-load loss and load loss) and total weight.

A、 Rated capacity (kVA): Rated voltage The capacity that can be transported during continuous operation at rated current.
B、 Rated voltage (kV): The working voltage that a transformer can withstand during long-term operation To meet the needs of voltage changes in the power grid, there are tap points on the high voltage side of transformers, which adjust the output voltage on the low voltage side by adjusting the number of turns of the high voltage winding
C、 Rated current (A): The current that a transformer is allowed to pass through for a long time at its rated capacity
D、 No load loss (kW): The active power absorbed when the rated voltage at rated frequency is applied to one winding terminal and the other windings are open circuited. It is related to the performance and manufacturing process of iron core silicon steel sheets, as well as the applied voltage
E、 Idle current (%): The current passing through the primary winding when the transformer is unloaded on the secondary side at rated voltage Generally expressed as a percentage of the rated current
F、 Load loss (kW): Short circuit the secondary winding of a transformer and apply rated current to the rated tap position of the primary winding, resulting in the power consumed by the transformer
G、 Impedance voltage (%): Short circuit the secondary winding of the transformer, gradually increase the voltage in the primary winding, and 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 Generally expressed as a percentage of the rated voltage
H、 Phase number and frequency: Three phases start with S, and single-phase starts with D. The Chinese national standard frequency f is 50Hz. There are countries abroad with 60Hz frequency (such as the United States).
I、 Temperature rise and cooling: The difference between the temperature of the transformer winding or upper layer oil and the temperature of the surrounding environment of the transformer is called the temperature rise of the winding or upper layer oil surface The temperature rise limit for oil immersed transformer windings is 65K, and the oil surface temperature rise is 55K. There are also various cooling methods: oil immersed self cooling, forced air cooling, water cooling, tube type, sheet type, etc.
J、 Insulation level: There are insulation level standards. The insulation level of a transformer with a high voltage rated voltage of 35kV and a low voltage rated voltage of 10kV is represented as LI200AC85/LI75AC35, where LI200 represents the high voltage lightning impulse withstand voltage of 200kV, the power frequency withstand voltage of 85kV, the low voltage lightning impulse withstand voltage of 75kV, and the power frequency withstand voltage of 35kV. The insulation level of the current oil immersed transformer products of AUX High Tech Co., Ltd. is LI75AC35, which represents the high voltage lightning impulse withstand voltage of 75kV and the power frequency withstand voltage of 35kV. Since the low voltage is 400V, it can be ignored.
K、 Connection group number: According to Transformer 1 The phase relationship of the secondary winding, which connects the transformer winding into various combinations, is called the winding connection group. In order to distinguish different connection groups, the clock representation method is often used, which uses the phasor of the high-voltage side line voltage as the long pin of the clock, fixed at 12, and the phasor of the low-voltage side line voltage as the short pin of the clock. The number on which the short pin points is used as the label of the connection group Dyn11 indicates that the primary winding is connected in a (triangular) configuration, while the secondary winding is connected in a (star) configuration with a center point, with group number (11).

SBK three-phase dry-type transformer