Under the specified operating environment and operating conditions, the main technical data is generally marked on the nameplate of the transformer. Mainly include: rated capacity, rated voltage and its tap, rated frequency, winding junction group and 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 delivered during continuous operation at rated current.
B. Rated voltage (kV): The working voltage that the transformer can withstand when operating for a long time. In order to meet the needs of the grid voltage change, the high-voltage side of the transformer has tap taps, and the output voltage of the low-voltage side is adjusted by adjusting the number of turns of the high-voltage winding.
C. Rated current (A): The current allowed by the transformer under the rated capacity for long-term passage.
D. No-load loss (kW): When the rated voltage of the rated frequency is applied to the terminals of one winding, the active power drawn by the remaining windings is open. It is related to the performance and manufacturing process of the core silicon steel sheet and the applied voltage.
E. No-load current (%): When the transformer is unloaded at the secondary side of 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 pass the rated current at the rated winding position of the primary winding. The power consumed by the transformer at this time.
G, impedance voltage (%): short circuit the secondary winding of the transformer, 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 to the primary side at this time is generally rated voltage The percentage is expressed.
H, phase number and frequency: the beginning of the three phase is denoted by S, and the beginning of the single phase is denoted by D. China's national standard frequency f is 50Hz. 60Hz abroad countries (such as the United States).
I, and the cooling temperature: the temperature difference between the top oil temperature of the transformer winding or a transformer with the surrounding environment, referred to as an upper winding temperature rise of the oil level or oil-immersed transformer winding temperature limit of 65K, the oil temperature rise. 55K. Also has a variety of cooling: ONAN, forced air, water, a tube, a sheet type.
J, insulation level: there is insulation class standards. Insulation level representation example as follows: a high pressure rated voltage of 35kV, a rated voltage of low voltage of 10kV transformer insulation level is expressed as LI200AC85 / LI75AC35, which represents the transformer high LI200 lightning impulse withstand voltage of 200kV, power frequency voltage withstand For 85kV, the low-voltage lightning impulse withstand voltage is 75kV, and the power frequency withstand voltage is 35kV. The current insulation level of Oaks High-Tech Co., Ltd. is LI75AC35, which means that the transformer high-voltage lightning impulse withstand voltage is 75kV, power frequency The withstand voltage is 35kV, because the low voltage is 400V, which can be ignored.
K. Connection group label: According to the phase relationship of the transformer and the secondary winding, the transformer windings are connected into various combinations, which are called the connection group of the windings. In order to distinguish different connection groups, the clock representation is often used, that is, the phasor of the high-voltage side line voltage is fixed as 12 on the long needle of the clock, and the phasor of the low-voltage side line voltage is used as the short needle of the clock. In a number, it is used as the label of the joint group. For example, Dyn11 indicates that the primary winding is a (triangle) joint, and the secondary winding is a (star) joint with a center point, and the group number is (11).
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