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Dry Type Transformer Isolation and Ultra Isolation Transformer A.C. Variable Supplies Special Purpose Transformer

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Dry Type Transformer
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Dry Type Transformer


Dry Type Transformer
Dry type transformer are non-explosive fire resistant, air insulated, and are cooled by natural circulation of air through ducts provide in the windings. High temperature and high dielectric insulating materials like glass fiber reinforced, nomex insulating tapes are used in such a way that the entire assembly is capable of withstanding high electrical and mechanical stresses with good dissipation of heat causing low temperature rise within the prescribed limit of insulation class.

Standard
The Dry Type transformer are manufactured to comply with National International Standards BIS, IS 11171, IEC 76.

Description
The winding are made up of electrolytic Grade, Soft and bright annealed copper conductors covered with nomex insulating tapes. The wound coils are preheating and impregnated with silicon varnish under vacuum pressure and undergo a curing cycle. The low voltage coils are wound over glass fiber reinforced cylinder having high mechanical strength. The high voltage coils are supported over yoke on glazed porcelain or resin insulators. The core is made of CRGO silicon steel laminations duly annealed after shearing and assembled in mitred construction for low “NO LOAD” LOSS.

The yoke frame has adjustable pressure plates to clamp & secure the coils adequately. Lifting arrangements is provide on the top yoke frame so that the core and coil assembly is lifted. OFF-CIRCUIT TAMPING if required are provided on HV winding and terminated on fiber glass terminal board for changing the transformer ratio in “OFF CKT” position.

Applications
Fire safety and environmental aspects are of increasing importance especially in respect of energy supply. The substitution of oil-filled transformers by dry type transformers is one of the most important step towards it. Dry Type transformer is used when it has to be located near load center and in a fire hazardous place. As there is no oil used in the transformer and special type of fire resistant insulation are used for the windings the fire risk is considerably reduced.
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Standard Specifications
Capacity Up to 2500 KVA
No. of Phases 3 Phase
Frequency 50 Hz.
Voltage Range 11 KV
Tapping On Load Tap Changer to provide +5% to -15% Taps in steps of 1.25% on the H.T. Side. Else, Off Circuit Tap Links for ± 5% Taps on H.T. Side in steps of 2.5% each.
Insulation Class 'F' (for Dry Type Trf.)
Vector Group Dyn 11
Duty Cycle Continuous
Winding Copper Wound
Terminals As per required.

Dry type Transformers has the following advantage
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Isolation and Ultra Isolation Transformer


Isolation and Ultra Isolation Transformer
Switching of Electrical Equipments in industrial and commercial Generates spikes up to 10000 Volts and high frequency Noises thus disturbing the sine wave output. The spikes can cause the failure of Thyristor, Microprocessor or other sensitive devices.

The High frequency noise can interface with digital – Electronic Equipments Causing data corruption erratic behaviors, loss of memories etc…

Isolation Transformer eliminate such noises and attenuates the spikes to minimal values, providing complete protection against such electrical disturbances. It consists of double wound Transformers with Extremely low coupling capacitance to isolate the voltage spikes and reduce noise from mains with extremely high insulation resistance. The turn ratio of Isolation transformer is 1:1. It is generally installed with the separate machines.
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A.C. Variable Supplies


A.C. Variable Supplies
With vast experience in design, skilled workforce and most modern infrastructure, We manufacture A.C. Variable supplies an equipment which is used to vary the 400/440 fixed volts to 0-11 kv (Variable) with capacity upto 5000 kva.

These Variable Supplies are generally used for testing of Transformer, Motors, and Generators manufacturing units to perform various electrical tests.

A.C. Variable Transformer comprises of Buck-Boost Double Wound Transformer, plus-minus Type linear rolling contact regulator for stepless control & Electronic control unit.
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Special Purpose Transformer


Special Purpose Transformer
We offer Furnace Transformer, 3 Phase To 2 Phase Transformer (Scott-Connection, LE-Balance Transformer), 2 Phase To 2 Phase Transformer, Step Down Transformer, Step Up Transformer, Balancing Transformer, Auto /Double Wound Transformer
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