1. What is high voltage transformer?
In the AC circuit, the device that increases or decreases the voltage is called transformer. The transformer can convert any value of voltage into the voltage value we need with the same frequency to meet the requirements of electric energy transmission, distribution and use. For example, the electricity from a power plant has a low voltage level, and the voltage must be increased before it can be transported to a distant power consumption area. The power consumption area must be reduced to a suitable voltage level to supply power equipment and daily electricity. Equipment.
2. How does the transformer transform the voltage?
Transformers are made based on electromagnetic induction. It consists of an iron core stacked with silicon steel sheets (or silicon steel sheets) and two sets of coils wound around the iron core. The iron core and the coils are insulated from each other without any electrical connection, as shown in the figure.
The voltage ratio of the primary coil to the secondary coil of the transformer and the ratio of the turns of the primary coil to the secondary coil are related to the value of the turns ratio of the primary coil and the secondary coil, which can be expressed by the following formula: the voltage of the primary coil / the voltage of the secondary coil = the number of turns of the primary coil / the number of turns of the secondary coil. The more, the higher the voltage. Therefore, it can be seen that the secondary coil is less than the primary coil, which is a step-down transformer. The opposite is a step-up transformer.
3. What types of transformer designs are there?
According to the number of phases, there are single-phase and three-phase transformers. According to the purpose, there are power transformers, special power transformers, voltage regulating transformers, measuring transformers(voltage transformers, current transformers), small power transformers (for low-power equipment), safety transformers, core type and shell type according to their structure. two kinds. The coils have double windings and multi-windings, and auto transformers are divided into oil-immersed and air-cooled according to the cooling method.
4. What parts are the transformer components made of?
Transformer components are mainly composed of iron cores and coils, in addition to oil tanks, oil pillows, insulating sleeves and tap heads.
5. What are the main technical data of the transformer?
(1). KVA of rated capacity.
(2)Rated voltage in volts.
(3)Rated current amperage. Refers to the line current I line value that the primary coil and secondary coil allow long-term passage under the conditions of rated capacity and allowable temperature rise.
(4)Voltage ratio. Refers to the ratio of the rated voltage of the primary coil to the rated voltage of the secondary coil.
(5)Wiring.
6. What kinds of tests should the transformer do during operation?
（1）Temperature test. Whether the operating state of the transformer is normal or not, the temperature is very important. The regulations stipulate that the upper oil temperature should not exceed 85℃ Generally, transformers are equipped with special temperature measuring devices.
（2）Load determination. The current value should be 70% to 80% of the rated current of the transformer. When it exceeds, it means overload and should be adjusted immediately.
（3）Voltage measurement. Regulations require that the voltage variation range should be within ±5% of the rated voltage.
（4）Determination of insulation resistance. To prevent insulation aging and accidents, the measured resistance should not be lower than 70% of the previously measured value.
