There are corresponding technical requirements for different types of 8000KVA oil-immersed transformers, which can be expressed by corresponding technical parameters. For example, the main technical parameters of the power supply 8000KVA oil-immersed transformer are: rated power, rated voltage and voltage ratio, rated frequency, working temperature grade, temperature rise, voltage regulation, insulation performance and moisture-proof performance, and the main technical parameters of the general low-frequency 8000KVA oil-immersed transformer are: voltage conversion ratio, frequency characteristics, nonlinear distortion, magnetic shielding and electrostatic shielding, efficiency, etc

A. Voltage Ratio:

The number of coils in the two sets of 8000KVA oil-immersed transformer is N1 and N2 respectively, N1 is the primary and N2 is the secondary. Add an AC voltage to the primary coil, and an induced electromotive force will be generated at both ends of the secondary coil. When N2 > N1, its induced electromotive force is higher than the voltage applied at the primary level, this 8000KVA oil-immersed transformer is called a step-up 8000KVA oil-immersed transformer: when N2

When n < 1, then N1> N2, V1 >V2, the 8000KVA oil-immersed transformer is a step-down 8000KVA oil-immersed transformer. On the contrary, it is a step-up 8000KVA oil-immersed transformer.

B.8000KVA Oil-immersed Transformer Efficiency:

At the rated power, the ratio of the output power to the input power of the 8000KVA oil-immersed transformer is called the efficiency of the 8000KVA oil-immersed transformer, ie

η= x100%

where the η is the efficiency of 8000KVA oil-immersed transformer; P1 is the input power and P2 is the output power.

When the output power P2 of the 8000KVA oil-immersed transformer is equal to the input power P1, the efficiency η is equal to 100%, and the 8000KVA oil-immersed transformer will not produce any loss. But in fact, this 8000KVA oil-immersed transformer is not.8000KVA oil-immersed transformer always has to produce losses when transmitting electric energy, and this loss mainly includes copper loss and iron loss.

Copper loss refers to the loss caused by the resistance of the coil of the 8000KVA oil-immersed transformer. When the current is generated by the coil resistance, a part of the electrical energy is converted into heat energy and lost. Since the coil is generally wound by insulated copper wire, it is called copper loss.

The iron loss of 8000KVA oil-immersed transformer includes two aspects. The first is hysteresis loss, when the AC current passes through the 8000KVA oil-immersed transformer, the direction and size of the magnetic field lines of the silicon steel sheet of the 8000KVA oil-immersed transformer change accordingly, so that the internal molecules of the silicon steel sheet rub against each other and release heat energy, thereby losing part of the electrical energy, which is the hysteresis loss. The other is eddy current loss, when the 8000KVA oil-immersed transformer is working. There are magnetic field lines passing through the iron core, and an induced current will be generated in the plane perpendicular to the magnetic field lines, because this current forms a closed loop to form a circulation, and forms a vortex shape, so it is called eddy current. The presence of eddy currents heats up the iron core and consumes energy, and this loss is called eddy current loss.

The efficiency of the 8000KVA oil-immersed transformer is closely related to the power level of the 8000KVA oil-immersed transformer, usually the larger the power, the smaller the loss and output power, and the higher the efficiency. Conversely, the lower the power, the lower the efficiency.

How to determine the parameters of the power supply 8000KVA oil-immersed transformer

The marks of the nominal power, voltage, current and other parameters of the 8000KVA oil-immersed transformer of the power supply will fall off or disappear over time. Some commercially available 8000KVA oil-immersed transformers do not mark any parameters at all. This is a great inconvenience to use. The following describes the method for identifying the parameters of the 8000KVA oil-immersed transformer of the unmarked power supply. This method also has reference value for the purchase of 8000KVA oil-immersed transformer.