Main technical parameters of the transformer
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. 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 under no load on the secondary side under 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, the rated current is applied to the rated winding position of the primary winding, and 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 representation.
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. There are 60Hz countries abroad (such as the United States).
I. Temperature rise and cooling: The difference between the temperature of the transformer winding or the upper oil temperature and the temperature around the transformer is called the temperature rise of the winding or the upper oil surface. The temperature rise limit of the oil-immersed transformer winding is 65K, and the oil surface temperature rise is 55K. There are also a variety of cooling methods: oil immersion from cold, forced air cooling, water cooling, tubular, and sheet.
J. Insulation level: There are insulation grade standards. The example of the insulation level is as follows: the high voltage rated voltage is 35kV, and the low voltage rated voltage is 10kV. The transformer insulation level is expressed as LI200AC85/LI75AC35, where LI200 means the transformer high voltage lightning impulse withstand voltage is 200kV, power frequency withstand voltage 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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Label: main technical parameters of the transformer
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