Tag: isolation transformer

1. How to choose the single-phase isolation transformer's capability?

1) Principle of selecting single-phase transformer capacity

Reducing the capacity of the equipment will help to alleviate the excessive line losses that currently exist in the 10kV distribution network when the power load is typical. The low-voltage distribution network's load can alter at any time, depending on the time of year, the season, etc. When developing a 10kV distribution network, a single three-mixed distribution transformer installation method is typically employed. This scheme can be customized with one or more single-phase distribution transformers. Determine the capacity demand of a single-phase isolation transformer based on the specific changes in electricity consumption load and the low-voltage grid's mode of operation, then select the transformer that is most appropriate for power delivery.

Autotransformers and isolation transformers are two different forms of transformers that work on the same principle. Both use an energy conversion between the alternating magnetic field and the alternating current in the coil to convert the voltage. So what's the difference between them? The following article lists six major differences between autotransformers and isolation transformers.

The "input" and "output" terminals of a isolation transformer should be short-circuited to test their insulation resistance against the ground wire by a megohmmeter. When measuring by 1000V megohmmeter, the resistance value is greater than 2M ohms. The cross-sectional area of the isolation transformer input and output power lines should meet the requirements of its current value. It is appropriate to configure the electric current density of 2 ~ 2.5a /mm2.

The principle of three-phase isolation transformer basically adopts the principle of electromagnetic induction. It is safe to use a three-phase isolation transformer, which is generally used as a maintenance power supply. The isolation transformer is commonly 1:1 transformer, but it has different specifications. Three-phase isolation transformers are used for changing voltage, lighting, power supply and rectifying power supply, widely applied to industrial and mining enterprises, power plants, airports, high-rise buildings, subways and other places with high fire safety requirements.

As a relatively safe transformer in the power industry, isolation transformer has been widely used in electronic industry or industrial and mining enterprises, machine tools and mechanical equipment in general circuit control power supply, safety lighting and indicator power. Due to its excellent product performance, isolation transformer has been used in more fields and scope, and may gradually replace the ordinary transformer. What's the difference? The following is a simple analysis of the main differences between the isolation transformer and the ordinary transformer.

The isolation transformer is a device adopting the principle of electromagnetic induction to change the AC voltage. The main components are the primary coil, the secondary coil and the core (magnetic core). The main functions are voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization (magnetic saturation transformer) and so on. Due to its excellent product performance, isolation transformer has been used in more fields and scope. As we all know, power transformation relies mainly on the step-up & step-down transformer.

Isolation transformer is the transformer with electrical isolation between the input winding and the output winding. Isolation transformer is used to avoid users accidentally touching the charged body at the same time. Isolation transformer, whose transformer ratio is usually 1:1, is a special transformer with high insulation strength between the primary winding and secondary winding to isolate different potential to suppress common mode interference. The main function of the step-up & step-down isolation transformer is to completely insulate the primary side and the secondary side, and also to isolate the loop. In addition, the high frequency loss of the iron core is used to suppress the high frequency clutter into the control loop. 

Although three-phase isolation transformers and single-phase isolation transformers are different types of step-up & step-down isolation transformer products, they all have very similar functions and can be used for converting voltage and current, safe isolation and voltage regulation, and play a very important role in many professional fields. However, there are significant differences between them.

Step up or step down transformer is an important part of power grid operation, it's of great significance to the stable operation of the power grid. It meets different power demands by adjusting current and voltage. Once a transformer fails, it will cause great losses to the whole power grid, and further affects the normal operation of industrial production. In order to ensure the efficient operation of transformers, it is necessary to carry out a comprehensive management of the whole process of installation and application, thus reducing potential safety hazards and improving operational efficiency.

Q: What is a transformer?
A: A transformer is a device that step up or step down the voltage in an AC circuit. It converts the voltage of any value into the voltage value we need at the same frequency to meet the requirements for the delivery, distribution and use of electrical energy. For example, the electricity generated by the power plant has a low voltage level, and the voltage must be raised to be transported to a remote power consumption area. And the power supply area must be turned down to a suitable voltage level to supply power equipment and daily power equipment.

Why buy an isolation transformer from ATO?
ATO isolation transformers have the special advantages as follows:

1. High quality in lower price, manufactured direct sale.
2. They can work as step-up transformers or step-down transformers and voltage less than 1000V.
3. Isolation transformers with a NEMA 3R enclosure, suitable for both indoor and outdoor applications.
4. Voltage convert: Single phase to single phase, three phase to three phase, or three phase to single phase.
5. Transformers have a minimum 2 year warranty, long life span and high efficiency.