What is a three phase isolation transformer used for?

The isolation transformer generally refers to the transformer with a voltage of 1:1, the voltage on both sides of the transformer is the same, the transformer does not have the effect of voltage transformation, and there is only a direct connection of the magnetic connection without electricity in the circuit, which plays an isolation role. The application occasions of high-voltage isolation transformers are different, and the functions are also different;

1. Anti-interference effect: for example, after passing the isolation transformer of Y-wiring, it can prevent the transmission of some harmonics;

2. Impedance transformation: increase the impedance of the system, so that the protection device is easy to match;

3. The function of stabilizing the system voltage: such as reducing the impact on the system voltage when starting the large-load equipment;

4. The function of preventing system grounding: when single-phase grounding occurs on the load side of the isolation transformer, it will not cause the whole system (the part above the isolation transformer) to be single-phase grounded;

5. Reduce short-circuit current: when a short-circuit accident occurs on the load side, limit the short-circuit current of the system;

6. Other functions.

Three-phase isolation transformer.

Connect an isolation transformer (triangular star) at the power input

1. If the third harmonic and interference signal of the power grid are more serious, the use of yo isolation transformer can remove the third harmonic and reduce the interference signal.

2. The yo isolation transformer can be used to generate a new neutral wire, so that the equipment has nothing to do with the neutral wire of the power grid, so as to avoid the abnormal operation of the equipment due to the poor neutral wire of the power grid.

3. The current waveform distortion (such as the third harmonic) caused by nonlinear load can be isolated without polluting the power grid.

Connect an isolation transformer (star triangle) at the power supply output

1. Prevent the current distortion of the nonlinear load, which affects the normal operation of the regulated power supply and returns to the power grid, and plays a role in purifying the power grid.

2. The distortion of the nonlinear load current affects the accuracy of sampling, and the control signal that can reflect the actual situation can be obtained at the input end of the yo isolation transformer, so that the control of the regulated power supply is normal.

3. If the load is unbalanced, the use of yo will not affect the normal operation of the regulated power supply.

Three-phase isolation transformer is mainly used for power system, industrial and mining enterprises, power load requirements and power grid electrical isolation of field cooperative power supply, turning mains power into magnetoelectricity, as precision measurement test system purification (anti-interference) power supply and power network isolation equipment.

The isolation transformer is a safe power supply, which is generally used for machine maintenance and protection, lightning protection and filtering.

An isolation transformer is a 1 to 1 transformer. The primary single-phase is 220V, and the secondary is also single-phase 220V. or primary three-phase 380V, secondary is also three-phase 380V.

First of all, the AC power supply voltage we use is usually connected to the ground by one wire, and there is a potential difference of 220V between the other wire and the earth. Human contact can produce electric shock. The secondary stage of the isolation transformer is not connected to the earth, and there is no potential difference between any two of its wires and the earth.

People will not be electrocuted if they touch any of the wires, so it is safer. Secondly, the output and input of the isolation transformer are completely "open" and isolated, which effectively plays a good filtering role for the input end of the transformer (the power supply voltage supplied by the power grid). This provides a pure power supply voltage to the electrical equipment.

1. The main task is different: the main task of ordinary transformer is to change the voltage, which is divided into step-down transformer and step-up transformer, and the number of turns of the primary and secondary coils is not equal. The isolation transformer is not the main task of ordinary transformers, and some transformers are not isolated on the primary and secondary sides, such as autotransformers.

2. Different definitions: isolation transformer refers to the separation between the primary and secondary coils on the DC circuit. Ordinary transformer refers to the transformer used in machine tools and equipment control lines, which generally changes high voltage to low voltage.

3. Different usage: the isolation transformer is mainly to isolate the power supply and the load, so that there is no direct electrical connection between the two sides. It is generally used in low-voltage instruments and experiments.

Ordinary transformers are controlled within a required range of use according to the voltage and current required by electrical equipment.

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Extended Materials. Classification: 1. According to the number of phases:

1) Single-phase transformer: used for single-phase load and three-phase transformer set.

2) Three-phase transformer: used for the rise and fall voltage of the three-phase system.

2. According to the cooling method:

1) Dry-type transformer: relying on air convection for natural cooling or increasing fan cooling, mostly used in high-rise buildings, high-speed toll stations and local lighting, electronic circuits and other small-capacity transformers.

2) Oil-immersed transformer: relying on oil as the cooling medium, such as oil-immersed self-cooling, oil-immersed air cooling, oil-immersed water cooling, forced oil circulation, etc. Working principleThe transformer is composed of an iron core (or magnetic core) and a coil, the coil has two or more windings, of which the winding connected to the power supply is called the primary coil, and the rest of the windings are called secondary coils.

It can transform AC voltage, current, and impedance. A transformer is a stationary electrical appliance made using the principle of electromagnetic induction. When the original coil of the transformer is connected to the AC power supply, the alternating magnetic flux is generated in the core, and the alternating magnetic flux is universally expressed.

The isolation transformer is generally 1:1, and the main purpose is to prevent personnel from being electrocuted.

The function of the isolation transformer is to isolate the two phases of electricity to prevent the occurrence of electric shock accidents.

The isolation transformer is a safety power supply, which is generally used for protection, lightning protection and filtering in the maintenance of the machine. An isolation transformer is a 1 to 1 transformer. The primary single-phase is 220V, and the secondary is also single-phase 220V.

or primary three-phase 380V, secondary is also three-phase 380V.

The principle of an isolation transformer.

The principle of an isolation transformer is the same as that of an ordinary transformer. All use the principle of electromagnetic induction. Isolation transformers generally refer to 1:

1 transformer. Due to the discord of the secondary grounds. There is no potential difference between any of the secondary wires and the ground, and it is safe to use and is often used as a maintenance power supply.

Isolation transformers are not all 1:1 transformers. The power supply that controls transformers and tube equipment is also an isolation transformer.

Power sources such as tube amplifiers, tube radios and oscilloscopes and lathe control transformers are isolation transformers. For example, in order to safely maintain color TVs, 1:1 isolation transformers are commonly used. Isolation transformers are used more often, and they are also used in air conditioners.