A transformer is a device that converts AC voltage through electromagnetic induction.The main function of the transformer is to convert alternating current from one voltage to another.The transformer has no moving parts and works according to the principle of magnetic induction. The design of the transformer is mainly used for step-up or step-down. According to the different winding, these transformers are mainly of two types, namely step-up transformer and step-down transformer.
What is Step Up Transformer？
A step-up transformer is a transformer used to change a low-voltage alternating current into a higher voltage alternating current with the same frequency, which is secondary current is higher than the primary voltage. In other words, there are more secondary winding than primary winding. For example, if you want to use a 220V device in some place with 110V electricity, you need a step-up transform.
How does Step Up Transformer work?
The step-up transformer is to convert low AC voltage, high current, Corresponding transformation of small impedance into high AC voltage and small current and high-impedance devices, when there is an alternating current in the primary coil When current flows, alternating current is generated in the iron core (or magnetic core) flow magnetic flux, causing voltage to be induced in the secondary coil (or Current).
The type of Step Up Transformers
1. High Frequency type
High-frequency step-up transformer adopts high-frequency voltage doubler rectifier circuit, Applying the latest PWM pulse width modulation technology and power Rate IGBT devices, and according to the electromagnetic compatibility theory, Using a special process to enable the DC generator to achieve high Quality and portable. By the control box and the double pressure device Partial composition, built-in protection resistance, with zero voltage
Position gate protection, over-current and over-voltage protection functions. volume Small, light, easy to carry, convenient and safe Reliable, suitable for on-site DC high voltage test in power sector, Arrester DC characteristics test and other needs DC High pressure occasions.
2. DC type
The DC step-up transformer has the characteristics of small size, light weight, compact structure, complete functions, strong versatility and convenient use. It is especially suitable for power systems, industrial and mining enterprises, scientific research departments, etc. to conduct the insulation strength test of various high-voltage electrical equipment, electrical components, and insulating materials under the frequency or DC high voltage. It is an indispensable important equipment in high voltage test.
3. AC type
The AC step-up transformer is a device that transforms AC voltage, current and impedance. When an AC current is passed through the primary coil, an AC magnetic flux is generated in the iron core (or magnetic core), causing a voltage (or current) to be induced in the secondary coil. ). The transformer is composed of an iron core (or magnetic core) and a coil. The coil has two or more winding. The winding connected to the power supply is called the primary coil. The winding is called the secondary coil. The AC step-up transformer has the characteristics of small size, light weight, compact structure, complete functions, strong versatility and convenient use. It is especially suitable for power systems, industrial and mining enterprises, scientific research departments, etc. to conduct insulation strength tests under the frequency or AC high voltage of various high-voltage electrical equipment, electrical components, and insulating materials. It is an indispensable important equipment in high voltage test.
4. Dry type
Since dry-type step-up transformers do not have oil, there is no fire, explosion, pollution, etc. Therefore, electrical codes and regulations do not require dry-type transformers to be placed in a separate room. Especially with the new series, the loss and noise have been reduced to a new level, creating conditions for the transformer and low-voltage panel to be placed in the same power distribution room. The safe operation and service life of a thousand-type step-up transformer largely depend on the safety and reliability of the transformer winding insulation.
5. Low Frequency type
The magnetic flux of the low-frequency transformer core is related to the applied voltage. The excitation current in the current does not increase with the increase of the load. Although the iron core will not saturate when the load is increased, the resistance loss of the coil will increase. If the rated capacity is exceeded, the heat generated by the coil cannot be dissipated in time, and the coil will be damaged. If the coil you use is made of superconducting material, the current will increase. It will not cause heat, but there is still impedance caused by magnetic leakage inside the transformer, but the output voltage will drop as the current increases. The greater the current, the lower the output voltage, so the output power of the transformer cannot be unlimited.
The construction of Step Up Transformers
1. Core
The transformer core requires the use of high-permeability materials.
With this core, magnetic flux can flow through quickly and with minimal losses.
Compared to nearby air, the materials comprising the core have high permeability. Therefore, this core material will restrict the magnetic field lines within it. In this way, transformer efficiency can be improved by reducing transformer losses.
2. Winding
Windings in a step-up transformer help to transmit the current on the transformer. Primary winding wires are thick with fewer turns, but Secondary winding wires are thinner with more turns. In this design, the primary winding carries a lower voltage than the secondary winding.
The applications of Step Up Transformer
The main application of a step-up transformer is in generator step-up (GSU) transformers found in all generating plants.Step Up Transformer used in power transmission lines generated by generators to change the high voltage. Step-up transformers have a wide variety of uses in electrical systems and transmission lines. Other applications of Step Up transformer include electric motors, X-ray machines, microwave ovens and so on.
The maintenance of Step Up Transformer
- Visual inspection of coils, leads, and temperature monitors
- Remove dust with a vacuum cleaner, and wipe the surface of the terminal board and other insulating parts with a dry cloth
- Check whether the wiring of all temperature meters is normal
- Measure the insulation resistance according to the routine and record the value
- Maintain the auxiliary device according to the relevant instruction manual
- Check whether the connection of the power line is tight to avoid accidents caused by overheating of the conductor due to loose joints
