750 kVA Medium Voltage Transformer – Complete Guide

Summary

A 750 kVA Medium Voltage Transformer plays a crucial role in power distribution systems where electricity needs to be transferred efficiently from high-voltage networks to usable voltage levels. These transformers are widely used in industrial plants, commercial buildings, hospitals, and large residential complexes, ensuring a reliable and stable power supply. In India, trusted manufacturers like Shakti Servo design and supply energy-efficient medium voltage transformers tailored for diverse operational needs.

Understanding the 750 kVA Medium Voltage Transformer

A transformer rated at 750 kVA transformer is designed to handle a substantial amount of electrical load. It typically steps down medium voltage—such as 11 kV, 22 kV, or 33 kV—to a low-voltage output of 433 V or 440 V suitable for distribution panels or heavy machinery.

These transformers are categorized as medium voltage (MV) units because they operate within the 1 kV to 33 kV range. They form a key part of the electrical infrastructure in sectors where stable voltage and efficient energy transfer are vital.

Types and Cooling Methods

750 kVA medium voltage transformers are mainly available in two types based on cooling method:

1. Oil-Cooled Transformers: These are the most common type used in outdoor or high-load applications. The oil helps in cooling and insulation, extending the life of the transformer. Variants include ONAN (Oil Natural Air Natural) and ONAF (Oil Natural Air Forced) cooling systems.

   
   

2. Dry-Type Transformers: Ideal for indoor or fire-sensitive environments such as hospitals, commercial complexes, and high-rise buildings. They use air or epoxy resin for insulation, eliminating the risk of oil leakage.

   
   

Key Features and Technical Highlights

• Capacity: 750 kVA three-phase, 50 Hz frequency.

• Primary Voltage: 11/22/33 kV (customizable).

• Secondary Voltage: 433 V or 415 V.

• Cooling Type: Oil-cooled (ONAN/ONAF) or Dry-type (Cast Resin).

• Efficiency: Typically above 98% with low no-load and load losses.

• Standards: Designed and tested as per IS 1180 and IEC guidelines.

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Manufacturers like 750 kVA transformer are built with high-grade CRGO core material, electrolytic copper windings, and robust insulation systems for superior efficiency and durability.

Applications

The 750 kVA Medium Voltage Transformer is ideal for:

• Industrial plants and factories

• Commercial buildings and shopping complexes

• Hospitals and data centers

• Renewable energy and utility projects

• Institutional and housing societies

Its ability to maintain consistent voltage ensures equipment safety, reduced power loss, and long-term operational reliability.

Frequently Asked Questions (FAQ)

Q1. What is the price of a 750 kVA medium voltage transformer in India?

Ans. The price typically ranges between ₹6 lakh and ₹15 lakh, depending on specifications, materials, and cooling type.

Q2. Which is better — oil-cooled or dry-type transformer?

Ans. Oil-cooled transformers are preferred for outdoor, heavy-duty applications, while dry-type transformers are best for indoor or fire-risk areas.

Q3. What is the average lifespan of a 750 kVA transformer?

Ans. With proper maintenance and load management, these transformers can last 25 to 30 years or longer.

Q4. What are the main losses in a transformer?

Ans. Transformers have no-load losses (core losses) and load losses (copper losses). Modern designs minimize these to improve efficiency.

Q5. Does the transformer require regular maintenance?

Ans. Yes. Periodic inspection of oil quality, insulation resistance, and temperature control ensures long service life and safe operation.

Conclusion

A 750 kVA Medium Voltage Transformer is a vital component for efficient power distribution and voltage regulation. By choosing a reputed manufacturer like Shakti Servo, industries can ensure top performance, low energy losses, and dependable power supply. Investing in a high-quality, BIS-certified transformer not only enhances operational stability but also delivers long-term savings through improved efficiency and durability.