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Transformer: Working, Types, Construction, and Industrial Application

By PMG Engineering ·

Transformers are essential static devices widely used in industrial and food processing plants for stepping up or stepping down voltage levels without altering frequency or power. In food processing factories, transformers ensure safe and stable electrical supply across various machinery and utility systems. Their role is crucial in the design and engineering of food factories, supporting power distribution, energy optimization, and equipment safety.

Working Principle of Transformer

A transformer operates on the principle of mutual induction, where an alternating current in the primary coil produces a varying magnetic flux. This flux, when linked to the secondary winding via the core, induces electromotive force (EMF) in accordance with Faraday’s Law of Electromagnetic Induction.

Types of Transformer

Transformers are categorized based on the direction of voltage transformation:

1. Step-Up Transformer

  • Purpose: Increases voltage from primary to secondary winding.
  • Application in Industry: Ideal for long-distance power transmission with reduced losses.
  • Used in: High-voltage supply sections of food manufacturing facilities.

2. Step-Down Transformer

  • Purpose: Decreases voltage from primary to secondary winding.
  • Application in Industry: Suitable for distribution systems and load-side equipment.
  • Used in: Food packaging units, electronic control panels, and HVAC systems.

 

Construction of transformer

The construction of transformer is of iron core laminated with steel bands core lamination are constructed from insulated metal thin metal strips. These laminations are separated and wound around the limp using a sheet of coat. The laminations are separated and wound around the limb using a sheet of coat or parchment. The winding consists of two types, main and secondary winding. These winding are isolated from each other and are made by electrical coil.

Core

Constructed using laminated silicon steel for reduced eddy current loss. Based on design:

 

Core type construction

  • Coils are wound on two limbs.
  • LV winding is placed closer to the core.

 

Shell type construction

In shell type construction, the coils are wound on central limb of a three limb core. The entire flux passes through central limb and divides in two parts going to side limbs shown in fig. Sandwich type winding is used in such a construction. This type of construction is popular in low voltage application like transformer used in electronic devices, power electronics converters.

          

Conservator

A cylindrical tank mounted above the main tank allows transformer oil expansion and contraction due to temperature changes, maintaining system stability.

      

Breather

Contains silica gel to absorb moisture from the air entering the transformer, thus protecting insulating oil and ensuring long-term reliability.

 

Radiator

Dissipates heat from transformer oil by increasing surface area, maintaining optimal operating temperature, crucial for food processing plant reliability.

Bushings

Insulated pathways for conductors to enter or exit the transformer safely. Porcelain bushings for small units, and oil-filled condensers for large-scale applications.

 

 

Buchholz relay

A safety device that detects internal faults by sensing gas accumulation, triggering protective shutdown in oil-immersed transformers.

                                           

Standard Voltage Classes and Industrial Applications

Transformers are used across various voltage classes based on industrial needs, especially in sectors like food manufacturing, where consistent power is critical.

 

Conclusion

Transformers play an indispensable role in powering food processing plants, enabling safe, efficient, and scalable operations. From stepping up voltage for transmission to stepping it down for machinery and control systems, their applications are deeply integrated into the core of food factory design. For businesses involved in food manufacturing consulting, food industry engineering, and project management for food factories, selecting and installing the right transformer type is crucial to ensure energy efficiency, safety, and compliance. As part of holistic food business consultancy services, transformer infrastructure design should be prioritized to support long-term plant performance and sustainability.

References

 

1.     https://www.electricaleasy.com/2014/03/electrical-transformer-basic.html

Frequently asked
Where are step-down transformers actually used inside a food processing plant?
Step-down transformers decrease voltage from the primary to the secondary winding and serve distribution systems and load-side equipment in food plants. Typical applications include food packaging units, electronic control panels and HVAC systems. Step-up transformers, by contrast, raise voltage and are used in the high-voltage supply sections of food manufacturing facilities, mainly to reduce losses over long-distance power transmission.
How does a transformer work without changing the frequency of the supply?
A transformer is a static device that steps voltage up or down without altering frequency or power. It works on mutual induction: alternating current in the primary coil produces a varying magnetic flux, and this flux, linked to the secondary winding through the core, induces an electromotive force (EMF) in accordance with Faraday's Law of Electromagnetic Induction.
Why is the transformer core laminated rather than solid?
The transformer core is built from laminated silicon steel, assembled as insulated thin metal strips held by steel bands, specifically to reduce eddy current loss. The laminations are separated and wound around the limb using a sheet of coat or parchment. Two windings, main (primary) and secondary, are formed from electrical coil and kept isolated from each other.
What is the difference between core type and shell type construction, and when would we choose shell type?
In core type construction the coils are wound on two limbs, with the LV winding placed closer to the core. In shell type construction the coils are wound on the central limb of a three-limb core, so the entire flux passes through the central limb and then divides into two parts going to the side limbs. Shell type uses sandwich type winding and is popular in low voltage applications such as transformers in electronic devices and power electronics converters.
Which transformer accessories protect the unit and keep the oil in good condition?
Four components matter. The conservator, a cylindrical tank above the main tank, allows transformer oil to expand and contract with temperature, maintaining stability. The breather holds silica gel to absorb moisture from incoming air, protecting the insulating oil. The radiator increases surface area to dissipate heat and hold optimal operating temperature. The Buchholz relay detects internal faults by sensing gas accumulation and triggers protective shutdown in oil-immersed transformers.
How do we select bushings for a plant transformer?
Bushings are insulated pathways that let conductors enter or exit the transformer safely, and the choice follows unit size. Porcelain bushings are used for small units, while oil-filled condenser bushings are used for large-scale applications. Correct bushing selection is part of ensuring safe, reliable power distribution in a food processing facility.
CITE THIS

PMG Engineering. (2022). Transformer: Working, Types, Construction, and Industrial Application. PMG Engineering. https://pmg.engineering/Article/126/transformer-working-types-construction-and-industrial-application/

https://pmg.engineering/Article/126/transformer-working-types-construction-and-industrial-application/