rectifiers, fans, sewing machines, sewing, stabilizers, cooler kits, fresh air fans, heat convectors, electrical appliances, special purpose transformers

POOJA'S RECTIFIERS FOR:

ELECTROPLATING

ANODISING

HYDROGENATION

D.C. DRIVE and other

ELECTROCHEMICAL PROCESSES

INTRODUCTION

POOJA's bring you the finest products designed and engineered by the people who have been in the Rectifier field for last 30 years. Rectifier is an economical and most efficient method of obtaining DC from AC supply. POOJA's manufacture wide range of Rectifiers covering 0-500 volts and upto 15000 Amps. capacity - suitable for Electroplating, Anodising, Hydrogenation and many other electro-chemical process.

The entire manufacturing process is under one roof ensuring 100% quality control at every stage of production. We believe in quality, delivery, systems and competitive cost in our supplies.

BRIEF SPECIFICATIONS :

Input Voltage	380-440 Volts, 3-Phase 50Hz. AC supply
Output Voltage	Fixed Rated maximum DC voltage or variable from zero to maximum rated voltage.
Output Current	Rated maximum DC current.
Temprature Rise	Less than 35 degree celsius above ambient at the top of the oil.
Efficiency	12V Rect-82%, 24V Rect-90%, 100V Rect-94% 200 V Rect-96% More than 250 V Rect-More than 97%
Ripple Content	Less than 5%
Insulation	'A' class for oil cooled.

STARTING CIRCUITRY

POOJA's Rectifiers are designed for 3 phase 50 Hz Ac input supply and are available for operations at any voltage between 380 and 440 volts, covering a wide range of voltage fluctuations. It is recommended that the input to the rectifier should be connected through proper protective device, to provide positive protection to personnel and the system, in the event of maintenance or in case fault occurs.

DC Output Control :

The function of the variable output controls is to control the voltage or current or its operating range by varying input voltage to the main transformer primary. The DC output voltage variation is achieved steplessly 0-100% by means of ON LOAD roller type POOJA's make voltage regulator.

VIEW OF REGULATOR

SALIENT FEATURES :

1. POOJA's Rectifier equipments are wound with elctrolytic Prime grade copper strip to minimise power losses, in comparison to Aluminium conductor used by many other manufacturers. Our equipments are designed liberally as per capacity and are ideally suitable for marginal overloading conditons.

2. We use vertical Rolling contact type voltage regulator wound with heavy section of copper strips suitable for 100% continuous duty cycle for industrial applications, in comparison to conventional wire wound Regulators used by other manufacturers. The carbon rollers move on both sides of the winding.

3. DIODES : Silicon diodes are tested in house, similar PIV batch and same forward drop diodes are used in the equipment for equal load sharing and reducing the power lossess of diodes.

4. LAMINATION CORE : We use imported CRGO Lamination core which have minimum power losses and results in better efficiency of equipment and saving in energy bill.

5. PAINTS : We are painting the equipment with Epoxy paint which is resistant to acidic envoirnment of plating process and enhances the life of the equipment by preventing it from corrosion.

6. METERS : We use reputed make AE/RISHAB make DC meters only which are accurate and durable.

7. CONSTANT VOLTAGE CONTROLLER (CVC) (OPTIONAL) : We offer CVC Elctronic attachment with rectifier equipments, which will maintain constant Output Voltage or current as per setting automatically-irrespective of input voltage variation.

8. SERVICING : POOJA's have maintained enviable reputation in market in after sales service. This fact can be varified from any of our customers.

ADVANTAGES OF ROLLER TYPE REGULATOR AS COMPARED TO THYRISTORISED CONTROL

1. No. wave form distortion at any load.

Wave form distortion.

Electrical waveform is like a moving wheel. For 50% Rated Voltage the Dia of wheel is reduced accordingly i.e magnitude for a wave is decreased.

It is like the cutting the wheel by 50% and then moving the wheel i.e waveform is cut as shown at full magnitude.

2. Higher power factor of more than 0.95 is achieved.

The power factor is lower between 0.5 to 0.9

3.The system is simple and can be repaired and maintained even by simple mechanic.

The system is specialised and needs specially trained Electronic Engineer to repair and maintain.

4. The cost of spares is very negligible.

The cost of replacement is very high.

5. Over all losses are less.

Over all losses are more.

WHY THE REGULATOR IS SUPERIOR TO THYRISTORS IN RECTIFIER

1. In plating application, the regulator is better and technology is adopted in Germany and Europe because of as explained in point 1 to 5.

2. Other manufacturers of rectifiers have shifted to thyristors because they have to use sliding carbon brush type regulators.

3. Manufacturers of rectifiers claim that thyristor controlled rectifiers has less losses than regulator. They compare thyristor with sliding carbon type regulator.

In our case their claim is not true. We use vertical coil type rolling carbon regulator. The copper section is three times so the losses are almost 1/6 or Max 20%.

4. In our regulator, the rollers move on both side of the coil to give +- 440V or +-254V output. We design the rectifier in Q connection in which the regulator current is half the line current so losses are less and life is much more.