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Auto Transformers

Auto Transformers Manufacturer Call 9311169159

“Servomate” Autotransformer is an electrical transformer with only one winding. The "auto" prefix refers to the single coil acting on itself and not to any kind of automatic mechanism. In an autotransformer, portions of the same winding act as both the primary and secondary sides of the transformer. In contrast, an ordinary transformer has separate primary and secondary windings which are not electrically connected.

The winding has at least three taps where electrical connections are made. Since part of the winding does "double duty", auto transformers have the advantages of often being smaller, lighter, and cheaper than typical dual-winding transformers, but the disadvantage of not providing electrical isolation between primary and secondary circuits. Other advantages of auto transformers include lower leakage reactance, lower losses, lower excitation current, and increased VA rating for a given size and mass.

“Servomate” Autotransformer are often used to step up or step down voltages in the 110-115-120 V range and voltages in the 220-230-240 V range - for example, providing 110 V or 120 V (with taps) from 230 V input, allowing equipment designed for 100 or 120 V to be used with a 230 V supply. This allows US electrical equipment to be fed from the higher European voltage. Auto transformers can also be used to supply European 230 V appliances from a 100 or 120 V supply in countries outside Europe. In all cases the supply and the autotransformer must be correctly rated to supply the required power.

Auto Transformer Operation

“Servomate” Auto Transformer has a single winding with two end terminals, and one or more terminals at intermediate tap points, or it is a transformer in which the primary and secondary coils have part of, or all of their turns in common. The primary voltage is applied across two of the terminals, and the secondary voltage taken from two terminals, almost always having one terminal in common with the primary voltage. The primary and secondary circuits therefore have a number of windings turns in common. Since the volts-per-turn is the same in both windings, each develops a voltage in proportion to its number of turns. In an autotransformer part of the current flows directly from the input to the output, and only part is transferred inductively, allowing a smaller, lighter, cheaper core to be used as well as requiring only a single winding. However the voltage and current ratio of auto transformers can be formulated the same as other two-winding transformers:

TECHNICAL SPECIFICATIONS - MODEL HCSAIRCLD

Rating 250 kVa, 3 Phase
Output Current 362 Amps per phase
Input Voltage Range 340V to 460V, 47 - 53Hz, 4 Wire
Output Voltage 400V +/- 1%
Duty Cycle Continuous 24x7
Cooling Natural / Forced Air Cooled
Waveform Distortion Nil
Response Time Less than 10ms
Suitability All power factor loads
Class of Insulation B Class
Breakdown Strength 1500V AC for 2 minutes.
Insulation Resistance < 50 Mega Ω at 500V DC
Additional Facility Manual Operation
Installation Indoor type
Degree of Protection IP-30
No Load Loss Less than 0.4 %
Efficiency 98-99%
Applicable Standard IS 9815
Type & Suitability
  • Unbalanced Supply and Load. Suitable for 3 phase Unbalanced/ balanced Supply & Unbalanced/Balanced Load.
  • The unit consists of 3 nos. Single phase individually AC servo motor controlled units of 1/3rd of the total capacity connected in Star configuration.
Input / Output Termination On Brass studs / Connectors.
Winding & Wiring Material Copper EC grade (99.9% Pure)
Optional Features and Protections
  • Overload Cut-Off and Short Circuit Protection.
  • Low / High Voltage (out of input range) Alarm and / or Cut-Off.
  • Single Phase Prevention Alarm and / or Cut-Off.
  • High Temperature Alarm and / or Cut-Off.
  • Reverse Phase Cut-Off.
  • Auto Phase Correction in case of Phase Reversal.
  • Spike and surge protection
  • Ammeter, Temperature Meter, Digital Ammeter, Digital Voltmeter.
  • Stabilizer By Pass System
  • Remote control of stabilizer (with wires)
  • Earth fault protection
  • Delay on Circuits
Due to new innovations & improvements the technical specifications are subject to change.
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