Features of 3 Phase Variable Auto Transformer

Several kinds of electrical transformers are used in power systems in electrical engineering. There are two windings in a three-phase autotransformer: primary windings and secondary windings. The primary function of a general transformer is to step up or step down voltage levels as needed. Auto variable transformers have just one winding. However, the performance of the autotransformer is the same as that of a standard two-winding transformer. Because there is only one winding in the autotransformer route, it is shared by main and secondary.

3 Phase variable autotransformer has strong mechanical strength and short-circuits withstand ability, Read on to learn about more features of 3 phase variable autotransformer

Applications of 3 phase autotransformer

• These autotransformers are often used in train systems, audio systems and power transmission systems.
• When a voltage drop occurs in distribution lines, these autotransformers may rectify the voltage drop inside the cable.
• Because the squirrel cage induction motor requires a larger starting current, the voltage drops considerably. As a result, these autotransformers are utilised to increase the voltage when the motor starts.
• Induction motors and synchronous motors are mostly used for beginning applications.

Motorized Variable Auto Transformer

Reliable auto variable transformer exporters have carved out a profitable niche for themselves. This transformer has caster wheels for convenient movement. This transformer is made in our sound production facility using high-quality materials and components. This transformer is useful for boosting low-voltage lines and stabilising line voltage. They offer the motorised variable autotransformer accessible to customers in various configurations based on their needs.

This transformer has high mechanical strength and can resist short-circuits. It has a single layer winding on a high-grade steel toroidal core. Ideal for testing electrical and electronic devices for over and under-voltage.

How Variable Auto Transformers Work

 A carbon brush crosses the winding when the control knob is turned by tapping off the total voltage across the winding. The brush is always in touch with the winding. The voltage between turns is always smaller, than the discrete voltage increases acquired when the knob is turned. Because the brush covers more than one turn, the voltage shift is almost constant. Changing voltage auto transformers are rated in terms of current taken from the output since the output voltage is constantly variable.

Variable auto transformers are designed to operate from a nominal input voltage of 240 V I ph AC and may provide output voltages ranging from 0 to 240 V or 0 to 270V AC through simple transformer action. 3Ph AC and may also provide output ranging from 0 to 415V or 0 to 470V.

Features of the Variable autotransformers

• Simple, rugged construction.
• Contains high-grade Coils made from pure O Silicon Steel & copper?
• Variable DC Output is given using Diodes & Rectifies.
• Smooth Output voltage variation with continuous, break less & linearly proportional to angular rotation.
• High efficiency.
• Negligible waveform & power factor distortion.
• Excellent short time overload capacity.
• Remote operation is possible by motorization.
• Wide range of current ratings.
• High-quality carbon brush used for current collection