Electrician: Basic knowledge of 16 transformers. Teacher Fu said that 12 is already very impressive!（Ⅱ）
6. What is a Autotransformer?
The Autotransformer has only one set of coils, and the secondary coil is tapped out from the primary coil. Its electric energy transmission includes not only electromagnetic induction transmission, but also electric transmission. The number of silicon steel sheets and copper wires of this transformer is less than that of ordinary transformers, and it is often used to regulate voltage.
7. How is the Pressure regulator regulated?
The structure of the Pressure regulator is the same as that of the Autotransformer, except that the iron core is wound on the ring iron core as a ring coil. The secondary coil tap uses a sliding brush contact to make the contact ring slide along the surface of the coil, achieving a smooth voltage regulation effect.
8. What is the current relationship between the primary and secondary coils of a transformer?
When a transformer operates with a load, the change in secondary coil current will cause a corresponding change in primary coil current. According to the principle of magnetic potential balance, the current of the primary and secondary coils is inversely proportional to the number of coil turns. The current on the side with more turns is smaller, and the current on the side with less turns is larger. This can be expressed as follows: primary coil current/secondary coil current=secondary coil turns/primary coil turns. 9. What is the voltage change rate of a transformer?
The voltage change rate of the Pressure regulator is one of the main performance indicators of the transformer. When a transformer supplies power to a load, the voltage at the load end of the transformer will inevitably decrease. Compare the decreased voltage value with the rated voltage value, and take the percentage as the voltage change rate, which can be expressed by a formula; Voltage change rate=[(secondary rated voltage - load terminal voltage)/secondary rated voltage] × 100%. A typical power transformer has a voltage change rate of 4-6% when connected to the rated load.
10. How to ensure that the transformer has a rated voltage output?
If the voltage is too high or too low, it will affect the normal operation and service life of the transformer, so it is necessary to adjust the voltage. The method of voltage regulation is to introduce several taps into the primary coil and connect them to the tap opening. The tap opening changes the number of turns of the coil by rotating the contact. Just rotate the position of the tap changer to obtain the required rated voltage value. It should be noted that voltage regulation should usually be carried out after cutting off the load connected to the transformer.
11. What are the commonly used small transformers? What are the applications in?
Small transformers refer to single-phase transformers with a capacity of less than 1 kVA, mostly used as power transformers for electrical equipment control, electronic equipment power transformers, and safety lighting power transformers.
Contact
Email: info@aisitegroup.com
WhatsApp: +86-19838033999
Factory Address:500 meters southeast of Yilong Bridge in Yichuan, Luoyang, China
