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POWER LIFELINE SYSTEM
GST : 09ALQPC3784Q1Z6

250 Kva Three Phase Transformer

250 Kva Three Phase Transformer Specification

Dimension (L*W*H)
Approx. 1200 x 900 x 1400 mm

Low Voltage
433 V

Cooling Type
ONAN (Oil Natural Air Natural)

High Voltage
11,000 V

Voltage Booster Type
Dry

Standard
IS 1180/IEC 60076

Coil Material
Electrolytic Copper

Capacity
250 kVA

Rated Voltage
11 kV / 433 V

Load Loss
Approx. 2,150 W at full load

Operating Temperature
-25C to +50C

Product Type
Electrical Transformer

Material
Stainless Steel

Output
250 kVA at rated conditions

Frequency (MHz)
50 Hz

Efficiency
98.5%

Phase
Three Phase

Usage
Power distribution and industrial applications

Coil Structure
Toroidal/Wound Core

Coil Number
3 (Three-phase windings)

Power Scope
250 Kva

Weight
Approx. 1350 kg

Insulation Class
Class A or F

Accessories
Oil level gauge, thermometer pocket, conservator, drain valve, lifting lugs

Oil Type
Mineral insulating oil

Buchholz Relay
Provided

Paint Finish
Anti-corrosive epoxy coated

Protection
HT & LT side bushings, earth terminals, pressure relief device

Tap Range
+5% to -5% in 2.5% steps

Mounting Type
Wheel mounted

Winding Type
Double wound

Vector Group
Dyn11

Impedance Voltage
4.5% (Typical)

No Load Loss
Approx. 700 W

Temperature Rise
Maximum 45C (Oil), 55C (Winding)

250 Kva Three Phase Transformer Trade Information

Minimum Order Quantity
1 Unit

Payment Terms
Cash Advance (CA)

Supply Ability
100 Units Per Month

Delivery Time
10 Days

Main Domestic Market
All India

250 Kva Three Phase Transformer About

250 Kva Three Phase Transformer is an electrical device that is designed to convert electrical energy from one voltage level to another through the process of electromagnetic induction. In this case, the transformer has a power rating of 250 Kva, which means that it is capable of handling up to 250,000 watts of electrical power. This transformer is suitable for three-phase electrical system, which is utilized in industrial and commercial applications. The number of phases indicates the number of current-carrying conductors in the system.

Robust and Reliable Construction

This transformer is built with stainless steel and finished with an anti-corrosive epoxy coat, providing excellent durability in industrial environments. Its three-phase toroidal/wound coil structure, combined with mineral insulating oil and a Buchholz relay, ensures optimal safety and operational stability. The transformer supports reliable load transfer for power distribution networks and industrial setups.

High Efficiency and Low Loss Design

Operating at 98.5% efficiency, this transformer boasts low no-load and full-load losses (approx. 700 W and 2,150 W, respectively). The ONAN cooling type with oil conservator and thermometer pocket helps maintain the transformer within a safe thermal range, ensuring a long operational life and minimal maintenance requirements. The tap changer enables voltage adjustment to accommodate supply fluctuations.

Ease of Installation and Maintenance

With a compact dimension of approximately 1200 x 900 x 1400 mm and a wheel-mounted base, this 250 kVA transformer is easy to transport and position on site. Accessories such as an oil level gauge, drain valve, and lifting lugs simplify installation and routine maintenance. The conservator design and pressure relief device further safeguard against operational hazards.

FAQ's of 250 Kva Three Phase Transformer:

Q: How is the 250 kVA Three Phase Transformer installed and commissioned?

A: The transformer's wheel-mounted base and lifting lugs allow for easy transportation and precise positioning. Once positioned, proper earthing, oil filling, and connection to HT and LT bushings should be carried out by a qualified electrician or technician, followed by standard commissioning tests according to IS 1180/IEC 60076.

Q: What are the advantages of the ONAN (Oil Natural Air Natural) cooling system?

A: ONAN cooling uses natural air and oil circulation to dissipate heat, maintaining safe operational temperatures without the need for external pumps or fans. This system is energy-efficient, reliable, and requires minimal maintenance, ensuring the transformer achieves its maximum rated output safely.

Q: When should the oil level and Buchholz relay be checked?

A: Routine inspection of the oil level gauge and Buchholz relay is recommended during regular maintenance, typically quarterly or as specified by your maintenance schedule. Immediate checks are necessary if abnormal operation, leakage, or protection trips are observed.

Q: Where is this transformer best suited for use?

A: This 250 kVA transformer is ideal for power distribution in industrial plants, commercial complexes, and substations where three-phase supply and robust, reliable voltage transformation are essential. Its durable construction and protective features suit both indoor and sheltered outdoor installations.

Q: What protection features are included in this model?

A: The transformer is equipped with HT & LT side bushings, pressure relief device, earth terminals, and a Buchholz relay for gas and oil surge detection. These safeguards protect against overload, internal faults, and pressure build-up, minimizing the risk of equipment damage.

Q: How does the tap changer benefit voltage regulation?

A: The tap changer provides adjustable voltage output in +5% to -5% steps of 2.5%, allowing users to precisely manage voltage fluctuations and ensure consistent supply, which is crucial for sensitive or critical industrial operations.