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Sealed Distribution
Transformers

Engineered with precision and built for durability, our transformers ensure efficient, stable, and safe power distribution for industrial, commercial, and infrastructure applications.

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hermetically sealed distribution transformer 2500 kVA manufactured by Trinity Cleantech Telangana India
2500kVA
Max Rating
About This Product

Zero Maintenance. Maximum Reliability.

Trinity Cleantech's hermetically sealed distribution transformers deliver all the reliability of oil-filled design - with zero maintenance requirements. The fully sealed corrugated tank eliminates moisture ingress, removes the need for conservator tanks and breathers, and significantly extends service life. Available from 250 kVA to 2500 kVA, 33 kV class. Manufactured, tested, and certified at our automated 20+ acre facility in Jadcherla, Telangana.

BIS Aligned IS:1180 2014 ISO 9001 / 14001 / 4500 Factory Tested BEE Compliant
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Ultra-Low Losses

Prime-grade CRGO silicon steel core minimises no-load and load losses - sealed design preserves oil quality over decades

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EC Copper Winding

Electrolytic-grade copper ensures superior conductivity, heat dissipation and long winding life

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Fully Sealed - No Maintenance

No conservator tank, no breather, no oil topping required - completely maintenance-free operation for the full service life

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BEE Green Compliant

Available with biodegradable synthetic ester oil (IEC 61099) - ideal for indoor, coastal, and ecologically sensitive installations

100kVA
Minimum
Rating Available
2500kVA
Maximum Distribution
Transformer Rating
33kV
Maximum
Voltage Class
25K+
Transformers Supplied
Across India
Technical Specifications

Detailed Product Parameters

sealed distribution transformer technical specifications Trinity Cleantech India

Salient Features

  • Step Up and Step Down transformers with sturdy designs to withstand unpredictable system conditions
  • Electrolytic Grade (EC) copper winding for excellent conductivity and performance
  • Prime Grade CRGO core material for longer life and lower losses
  • BEE complied green transformers for minimal energy losses
  • Available in all vector groups and tapping arrangements - OCTC and OLTC
  • Hermetically sealed options with Mineral oil or Biodegradable ester oil
  • All cooling arrangements: Corrugated panels, Pressed Steel Radiator, ONAN/ONAF
ParameterSpecification
Ratings & Voltage Class
Three Phase, 100 kVA up to 2500 kVA, 33 kV Class
Duty
Outdoor
Applicable Standards
IS: 2026, IEC: 60076, BS, SANS, IS1180:2014 etc.
Losses
As per relevant standard / Customer requirement
Impedance
As per relevant standards or customer requirement
Tapping
OCTC or OLTC
Vector Group
Dyn11, Dyn5, Yzn11, Ynd etc.
Frequency
50 Hz
Insulation Class
A, B
Cooling
ONAN / ONAF
Winding Material
Copper (Cu) / Aluminium (Al)
Insulating Fluid
Mineral Oil or Synthetic Ester Oil
Core Material
CRGO (Cold Rolled Grain Oriented) Silicon Steel
Tank Type
Pressed / Fabricated Steel with Fins or Radiators
Accessories & Fittings
As per customer requirement
Construction Details

What Goes Inside Every Transformer

Every component is selected, inspected, and assembled to exacting standards - delivering transformers that outlast and outperform industry benchmarks.

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CRGO Core

Prime-grade Cold Rolled Grain Oriented silicon steel laminations - cut and stacked with precision to minimise magnetic losses and reduce heat generation under load.

Hi-B / Domain Refined options available
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EC Copper Winding

Electrolytic-grade (EC) copper conductors wound in continuous disc / helical / layer configurations depending on voltage and rating - insulated with thermally upgraded paper or Nomex.

Aluminium winding option available
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Insulating Fluid

High-quality transformer mineral oil or biodegradable synthetic ester oil - providing both electrical insulation and heat transfer.

Ester oil for fire safety & eco compliance
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Tank & Cooling System

Pressed or fabricated steel tank with corrugated fins, pressed steel radiators, or tube-type cooling - designed for ONAN and ONAF operations with bolt-on or welded construction.

Hermetic / conservator tank variants
Where It's Used

Applications of Sealed Distribution Transformers

From the last mile of the grid to large industrial complexes - Trinity distribution transformers serve every sector that needs reliable, efficient power delivery.

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Rural Electrification
Last-mile distribution to villages, farms, and rural communities across India's power grid
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Industrial Facilities
Factories, manufacturing plants, and process industries requiring stable HT to LT conversion
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Commercial Buildings
Offices, malls, IT parks, hotels and residential complexes needing reliable power infrastructure
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Renewable Energy
Solar farms, wind parks and hybrid energy installations requiring grid-connected step-up/down
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EV Charging Hubs
Power supply backbone for AC and DC EV charging stations and high-capacity depot chargers
How It Works

How a Sealed Distribution Transformer Delivers Power

A distribution transformer is the final step in the electricity delivery chain - receiving high voltage from the transmission grid and stepping it down to safe, usable levels for homes, factories, and businesses.

01
High Voltage Arrives at Primary Winding

33 kV / 11 kV power enters the transformer's primary copper winding through the HT terminals — connected directly to the distribution feeder

02
Electromagnetic Induction Through CRGO Core

The alternating current creates a magnetic flux in the CRGO silicon steel core - the high-grade grain orientation minimises core losses at every cycle

03
Voltage Stepped Down at Secondary Winding

The magnetic flux induces voltage in the secondary winding at a lower ratio - delivering 433V / 230V at the LT terminals for safe end-use distribution

04
Oil Cools and Insulates Throughout

Mineral or ester oil circulates around the core and windings, absorbing heat and providing electrical insulation - transferred to the fins or radiators for dissipation

Voltage Transformation Flow
33kV
Transmission Grid Input

High-voltage power from sub-transmission network enters through HT terminals

↓
11kV
Primary Distribution Level

Intermediate voltage from 11 kV feeders - common for urban and semi-urban distribution

↓
433V
Three-Phase LT Output

Step-down output at 433V (3-phase) for industrial and commercial loads

↓
230V
Single-Phase Output

230V single-phase supply distributed to homes, shops, and small consumers

98%+
Typical efficiency of modern distribution transformers
30yr
Expected service life of Trinity distribution transformers
50Hz
Operating frequency for India's power grid standard
33kV
Maximum voltage class handled by our distribution range
Ready to Order?

Request a Custom Sealed Distribution Transformer Quote

Share your capacity, voltage class, vector group, cooling preference, and application - our engineers will configure the exact transformer you need.

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Frequently Asked Questions

Everything You Need
to Know

Common questions about Trinity Cleantech sealed distribution transformers, specifications, and maintenance.

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Can't find what you're looking for?
marketing@trinitycleantech.com or call +91 80192 38877 - we respond within 1 business day.

A hermetically sealed distribution transformer is a fully sealed, oil-filled unit with no conservator tank or breather. The corrugated tank design compensates for oil expansion, completely eliminating moisture ingress - making it virtually maintenance-free and ideal for outdoor, coastal, or high-humidity environments.

Trinity Cleantech sealed distribution transformers are available from 250 kVA to 2500 kVA, 33 kV class, three-phase. Both indoor and outdoor duty variants are available. The range complies with IS:2026, IEC:60076, and IS1180:2014 standards.

Sealed transformers eliminate moisture ingress which is the primary cause of insulation degradation in conventional conservator-type units. They require no oil filtration, no topping up, and no breather silica gel replacement - significantly reducing lifecycle maintenance costs. They are particularly suited for remote locations, coastal areas, and installations where access for regular maintenance is difficult.

Yes. All sealed distribution transformers from Trinity Cleantech are BIS (Bureau of Indian Standards) Aligned, ISO 9001:2015 certified, and BEE (Bureau of Energy Efficiency) compliant. Each unit is 100% factory tested at our 20+ acre facility in Jadcherla, Telangana before dispatch.

Mineral oil (IEC 60296) is standard. Biodegradable synthetic ester oil (IEC 61099) is available for installations requiring improved fire safety and environmental compliance, such as indoor substations, underground vaults, and ecologically sensitive sites.

Sealed distribution transformers are ideal for rural electrification, remote industrial facilities, coastal and high-humidity areas, IT parks and commercial buildings, solar and wind energy farms, and EV charging hubs - anywhere that requires reliable power delivery with minimal maintenance intervention.

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Corporate Office

#9-1-83 & 84, Amarchand Sharma Complex,
Sarojini Devi Road, Secunderabad,
Telangana, India - 500003

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Manufacturing Plant

Plot No. L19-L28, TSSIC Green Industrial Park,
Jadcherla, Mahbubnagar District,
Telangana, India — 509302

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Get in Touch

+91 8019238877
marketing@trinitycleantech.com
www.trinitycleantech.com

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