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3 Phase Variable Auto Transformer

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MOQ : 1 Piece

3 Phase Variable Auto Transformer Specification

Standard
IS 5154 / IEC 60989

Low Voltage
0V AC (variable)

High Voltage
Up to 470V AC

Dimension (L*W*H)
Varies as per rating (e.g., 650x400x600 mm for 15 kVA)

Load Loss
Minimal, depends on load and model

Capacity
5 kVA to 500 kVA (varies as per model)

Cooling Type
Air Cooled and Oil Cooled

Voltage Booster Type
Variable Auto-transformer

Rated Voltage
415V AC Input (Customizable), Output 0470V AC

Operating Temperature
-10C to +45C

Coil Material
Copper (Standard), available in Aluminum on request

Product Type
Electrical Transformer

Material
Metal

Output
Variable AC Voltage

Frequency (MHz)
50 Hertz (HZ)

Efficiency
Up to 98%

Phase
3 Phase

Usage
Voltage Regulation, Testing, and Laboratory Applications

Coil Structure
Toroidal / Layer Wound

Coil Number
Single (Auto winding per phase)

Power Scope
Electric

Weight
Varies with capacity, up to 180 kg for higher ratings

Duty Cycle
Continuous

Insulation Class
Class F / H

Protection Features
Overload & Short Circuit Protection (Optional)

Ambient Humidity
Up to 90% RH non-condensing

Display
Analog/Digital Voltmeter and Ammeter (Optional)

Terminations
Brass Terminals / Copper Lugs

Control Method
Manual Rotation via Knob or Motorized Operation

Mounting Type
Floor / Panel Mounted

Enclosure
Sheet Metal with Ventilation

3 Phase Variable Auto Transformer Trade Information

Minimum Order Quantity
1 Piece

Payment Terms
Letter of Credit (L/C), Cheque

Supply Ability
100 Pieces Per Week

Delivery Time
2 Week

Packaging Details
Box

Main Export Market(s)
Middle East, Africa

Main Domestic Market
All India

About 3 Phase Variable Auto Transformer

3 Phase Variable Auto Transformer -

Rating Available: 4 Amps- 1600 Amps

We are endowed with a state-of-the-art infrastructural facility which back us in manufacturing and supplying 3 Phase Variable Auto Transformer. We manufacture this transformer using high quality materials and components, sourced from authentic vendors. It is an energy saving electrical transformer which can convert the voltage as required. Available in different sizes and technical specifications, our 3 Phase Variable Auto Transformer is highly demanded in the market. We offer this transformer at cost effective prices to clients.

Key Features:

This transformer has strong mechanical strength and short-circuit withstand ability
Has a single layer winding on a toroidal core of high grade steel
Ideal for over and under voltage testing of electrical and electronic equipment

Description:

Continuously Variable Voltage Auto Transformer is the most effective device for stepless, breakless & continuous control of AC voltage & therefore for various parameters, dependent on AC voltage.

These Variable Voltage Auto Transformers, consists of a single layer winding on a toroidal silicon-steel core. As the control knob is rotated, a carbon brush traverses the winding, tapping off a portion of the total voltage across the winding. The brush is in continuous contact with the winding. The discrete voltage increments obtained as the knob is rotated are always less than the voltage between turns. Since the brush spans more than one turn, the change in voltage is practically continuous. As output voltage is continuously variable, Variable Voltage Auto Transformers are rated in terms of current that can be drawn from the output.

The basic continuously Variable Voltage Auto Transformers is meant for operation from a nominal input voltage of 240 V I ph AC & can give output voltage anywhere between 0 to 240 v or 0 to 270V AC by simple transformer action. Three such Variable Voltage Auto Transformers connected electrically in star and mechanically in tandem, become suitable for operation from a nominal input voltage of 415V 3Ph AC and can give output anywhere between 0 to 415V or 0 to 470V.

Features:

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

MECHANICAL CONSTRUCTION

Single phase Variable Transformers are available in 3 types.
Potable type (P) with sheet steel enclosure for floor / table use.
Flush type (F) with open type construction. Suitable for panel mounting.
Tank type (T) immersed in oil in sheet steel tank with rollers.
Three phase Variable Transformers is usually ganged assembly of 3 coils, available in all 3 types: P,F,T.
Higher rating Continuously Variable Voltage Auto Transformers (above 200 Amps) use 2/3/4/5/6 or more coils in parallel with load balancing arrangements.
Tank type (T) immersed in oil in sheet steel tank with rollers.
Motorized Variable Transformers uses 240V AC Step-Syn Motor having 60 rpm speed at 50Hz. With proper gearing higher torque at lower speed can be achieved. Standard gear ratios used provide sweep time of 8, 15, 30, 45, 60, 120secs.

Variable Auto Transformer is a very useful & effective device for break less, step less & continuous control of AC voltage, and therefore control of several other parameters dependents on the AC voltage.

The normal output range is:

In single phase - 0 to 270 Volt
In three phase - 0 to 470 Volt

When three such variable auto transformer connected electrically in star and mechanically in tandem, turned suitable for operations of 415 v 3 phase AC supply, and to give output of 0 415 v, or up to 470 v.

We manufacture & supply Three Phase Variable Auto Transformer with enclosure / without enclosure. Here the average input range is 415 V & Output is 0 470 V, or up to 490 V. Also, we design & develop these three phase variable transformers with specific features, suitable for testing labs, educational institutions, etc. In oil-cooled models, we use appropriate radiators adequate to control the transformers heat. As per the requirements of customers, we provide motorization, distant control desk for decreasing, increasing, zero start, and other special features.

Rating available: 2 Amp to 2000 Amp
Single / Three Phase and Air / Oil Cooled
Special Input / Output Voltage ranges are also available on request

ELECTRICAL SPECIFICATIONS

MODEL	a)Flush Open Manual (Air Cooled) F
	b)Portable Enclosed Manual (Air Cooled) P
	c)In Tank Manual (Oil Cooled) T 'F' , 'P' , T suffixed by 'M' means motor operated models.
OPERATING VOLTAGE	For Single Phase 240V AC, 50-60 Hz. I- ph.
OPERATING VOLTAGE	For Three Phase 415V AC, 50-60 Hz., 3 ph 4wire.
CURRENT RATINGS	For Oil Cooled models, maximum current & continuous current are Appx. One & the same.
CURRENT RATINGS	For Air Cooled models. The power Factor is Appx. 0.8
OPERATING TEMP.	0^o - 45^oC
INSULATION RESISTANCE	Not less than 5M ohms at 500V DC.
DIELECTRIC TEST	2.5KV RMS for 1 Minute.
STORAGE TEMP.	- 9^oC to 70^oC
HUMIDITY	Upto 95% RH
CONFORMS TO	I.S. 5142.

Flexible Voltage Control for Demanding Applications

The 3 Phase Variable Auto Transformer is tailored to deliver variable AC voltage, making it indispensable for voltage regulation and testing across industries. Its advanced insulation, customizable mounting, and multi-mode operation ensure it adapts seamlessly to various setups while maintaining high reliability and safety.

Robust Construction and Safety Features

Designed with a sheet metal enclosure and superior ventilation, this transformer assures durability and safe operation. Options like overload and short circuit protection, along with brass/copper terminations and minimal load loss, enhance both performance and device longevity, even under continuous heavy-duty cycles.

Exceptional Efficiency and Global Standards Compliance

Achieving up to 98% efficiency and built as per IS 5154 and IEC 60989, the variable auto transformer aligns with the highest quality benchmarks. Its air- or oil-cooled configurations, varied power capacities, and easy-to-read displays make it suitable for distributors, manufacturers, and end-users alike.

FAQ's of 3 Phase Variable Auto Transformer:

Q: How does the 3 Phase Variable Auto Transformer operate and what are its control methods?

A: This transformer can be controlled manually by rotating a knob or operated motorically for precise, hands-free voltage adjustment. Its versatility enables users to choose the most suitable method for their specific application or preference.

Q: What protection features are available for this transformer?

A: It offers optional overload and short circuit protection to safeguard both the transformer and connected equipment, enhancing safety and preventing damage during abnormal electrical conditions.

Q: Where is this transformer commonly used and what benefits does it provide?

A: It is widely utilized in voltage regulation, testing facilities, and laboratory applications due to its reliability, high efficiency, and ability to provide variable AC output voltage, making it vital for accurate testing and equipment calibration.

Q: What is the process for customizing input/output voltage or mounting type?

A: Customers can specify their input voltage requirements or choose between floor and panel mounting during ordering. Manufacturers accommodate these needs, offering custom-built models tailored to unique operational environments.

Q: When should a user opt for air-cooled versus oil-cooled models?

A: Air-cooled models are suitable for moderate loads and ambient temperatures, while oil-cooled variants are better for higher capacities or when operating in demanding conditions where enhanced thermal management is essential.

Q: How does ambient humidity affect transformer usage?

A: Withstanding up to 90% relative humidity (non-condensing), this transformer is designed for continuous duty cycles in humid environments, ensuring stable operation and performance year-round.

Q: What materials and coil types are used in the construction?

A: Standard models use copper coils but can be supplied in aluminum upon request. With toroidal or layer-wound construction, these ensure optimal electrical performance and minimal load losses.

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