Power System Division

Dimmerstat(Auto-Transformer)
0.75 to 1600 Amps

Dimmerstat' is registered trademark for continuously variable voltage auto - transformer. It is the most effective device for stepless, breakless & continuous control of AC voltage & therefore for various parameters, dependent on AC voltage.
The basic Dimmerstat is meant for operation from a nominal input voltage of 240V AC & can give output voltage anywhere between 0 to 240V or 0 to 270V AC by simple transformer action. Three such Dimmerstat connected electrically in star and mechanically in tandem, become suitable for operation from a nominal input voltage of 41 SV 3Ph AC and can give output anywhere between 0 to 41 SV or 0 to 470V.
Resin moulded Dimmerstat is basically a variable Auto-Transformer which is partly or fully Moulded in Reinforced Polyester Resin. This has adjustable spindles which allows easy assembling of flush, table or Motorized Type in single or three phase models. These models are designed upto 120% continuous load.

AC Voltage Stabilizer
1 KVA to 3500 KVA

Servo Controlled Automatic AC Voltage Stabilizers of 'AP make conform to IS:9815 & are of 'EMS'i.e. 'Electro-Mechanicai Stabilizer' type.
The purpose of voltage stabilizer is to receive a fluctuating AC voltage of large amplitude & deliver an almost constant voltage, which remains within a very narrow band (± 1%) of the nominal voltage - quality of the AC voltage remains unchanged.
The voltage variations, which have become a common phenomenon in current power supply system, cause havoc in modern complicated & sophisticated equipments. The voltage stabilizers are meant to take care of this problem & protect the equipments. They ensure longer life of the equipments & also drastically cut down electricity consumption of equipments leading to continuous reduction in electricity bills. Thus, they play an important role in energy conservation which is need of the day.

The EMS type AC voltage stabilizer basically comprises of the following —
• Motorised Dimmerstat (Continuously variable voltage auto transformer).
• Buck-Boost Transformer
• AC Step-synchronous motor.
• Solid state electronic control circuit with switching triacs
• MOV5 for surge suppression.

Rectifier Units
Upto 24V DC 10000Amps for Electroplating and Anodising

These Rectifier units are suitable for all electro deposition processes within their rating. The widest applications in the field require maximum voltage of 8V, 12V and 20V D.C. at various current capacities as per requirement. A range of current ratings from 100 amps to 10000 amps is covered in our regular manufacture. Our standard sizes are listed in the price list issued separately.

Ultra Isolation Transformer
1 KVA to 300 KVA

1. Isolation Transformer:
Any Double Wound Transformer is internally an isolation transformer as the primary and secondary are isolated from one another through insulation. However, modern machines and systems need a truly isolated, clean and stable power requirement. This is ensured by an Ultra Isolation Transformer (UIT), it provides for total electrical arid electrostatic isolation with most effective screening of spikes, surges and transients, further it gives a true isolated local neutral and dedicated earth which are very essential for modern machines.
Ultra isolation Transformer alternates common mode noise and transverse mode noise and provides for noise or interference free power. In principle, UIT only transfers 50 Hz. Power by transformers action through mutual inductance. It prevents transfer of RF and HF disturbances with extensive insulation between primary and secondary. The insulation levels withstands HV breakdown strength of 2.5 KV and gives a DC Galvanic isolation of above 1000 megohms.
2. IP Enclosure Protection for Isolation Transformer:
AE Isolation Transformer conform to IP-30 protection as per IS:2147, Requirements for other degree of protection can be offered on request.
3. Details of Earthing for Isolation Transformers:
It is recommended that every isolation Transformer should have its own grounded earth, complete in itself.
4. Constructional Features of Isolation Transformers:
Isolation Transformer shall invariably be in one air cooled section.
The enclosures are constructed from M.S. angles and CRCA M.S. sheets of best quality of reputed make.
The professional painting process comprises of (i) 7-tank pre-treatment (ii) Primer Coating and (iii)Two coats of final finish paint or powder coating. or specified.

Low Tension Power Transformer
0.5 KVA to 800 KVA

■ Mining Transformer
■ Furnace Transformer
■ Rectifier Transformer
■ Lighting Transformer
■ Motor starting Auto Transformer
■ Ultra Isolation Transformer
■ Loading Transformer

Type of Transformer
■ Double wound Transformer
■ Auto wound Transformer

No of Phase
■ Single Phase
■ Three Phase
■ Three Phase to single Phase
■ Three Phase to Two Phase (Scott)

Type of cooling
■ Air cooled
■ Oil cooled

Salient features
■ Ranging form 12V to 660V at 50 Hz / 60 Hz
■ Conforms to IS2026,11171
■ Capacity = 0.5 to 800 KVA
■ Class of insulation class F H
■ Taps can be provided with OFF load
Tap changer or using links.
■ Efficiency better than 96%
■ Regulation better than 5%