Shakti Electrical Corporation Sitapura, Jaipur, Rajasthan

Step down transformer are designed, manufactured and supplied against specific requirement of supply voltage for the equipment. e.g. Equipments imported from American Countries work on supply voltage of 110120 V, 1-Ph or 200220 V, 3-Ph. Depending upon the type of equipment, Step up step down transformers can be supplied in both auto wound type or isolated type. Similarly step up or booster transformers are supplied for the areas, where the supply voltage is usually very low.

All these transformers are designed, manufactured and supplied against specific requirement of supply voltage for the equipment. e.g. Equipments imported from American Countries work on supply voltage of 110/120 V, 1-Ph or 200/220 V, 3-Ph. Depending upon the type of equipment, Step up/ step down transformers can be supplied in both auto wound type or isolated type. Similarly step up or booster transformers are supplied for the areas, where the supply voltage is usually very low.

Introduction of Product Highly fluctuating AC mains supply is a very common phenomenon in India and difficulties caused by them are well known. The stable Input supply is a basic necessity in the absence of which sophisticated equipment do not give optimal performance. Major industrial loads are inductive in nature (i.e .A.C. Motors) and they draw considerably high current at High & Low voltages resulting in higher losses which in turn increases the temperature of motors thereby reducing the motor life. Other equipments that are affected by high & Low voltages are Lighting loads(Bulbs & Tubes) Air conditioning plants Elevators & lifts ,Medical equipments etc.For overcoming this ‘Shakti’ manufacture state of art ‘Servo Voltage Stabilizer’ which encure constant output voltage thus providing complete protection and optimum efficiency of all electrical & electronic equipments. With the installation of shakti stabilizer’and maintain output voltage of 400V 3-0 /230V, 1-0 within 1% the motors operate smoothly without drawing excess current.Shakti’s 3-phase stabilizers are manufactured using individual controls for each phase thus making it suitable for unbalanced input voltage and unbalanced load current. Balance type unit can also be supplied on demand.   Effects of Voltage Unbalance The main effect of voltage unbalance between phases is damage to motor due to excessive heat.Voltage unbalance can create a current unbalance of 6 to 10 times the magnitude of voltage unbalance. Consequently this current unbalance creates heat in the motor winding that breaks down motor insulation causing cumulative and permanent damage to the motor. Figure shows the percentage of temperature rise as related to voltage unbalance. The relationship is exponential & approximately increases by twice the square of the voltage unbalance. In order to avoid frequent tripping of overload relays the operator sets the relays at higher than actual limits to continue the production . The motors cannot withstand this higher current for long time and in most cases the motor burns out and also damages controlling relays/contactors. The most suitable option is to use servo stabilizers having separate control system on each phase (Unbalance type). This will take care of both unbalanced and balanced input supply providing balanced 3-phase supply at output.   Benefits of Servo Voltage Stabilizer Maximum load in industries consist of motors, heaters & compressors. At high voltage they draw higher current thus increasing the power Consumption & MDI and reducing the power factor. Electrical equipments are designed for 230 Volts (1-Ph) i.e. 400 Volts (3-Ph) and have maximum efficiency at this voltage. These heavy electrical equipments draw considerably more power at higher voltage thus increasing the electricity bill of the industry. Similarly in the case of bulbs & tubes the percentages increase of power consumption will be more than double the percentage increase of voltage. The higher voltage also results into higher losses causing higher breakdown of Motors Lightings & all other electrical equipments. Servo stabilizer can give saving of upto 15% on power consumption & reduction in breakdown of electrical equipments upto 80% if voltage supply is above the recommended voltage and higher efficiency of your equipments if voltage supply is lower than the recommended voltage.   Salient Features of Servo Stabilizer   Fully solid state Micro Processor Based Digital control circuit. No waveform distortion. High efficiency. Auto / Manual operation facility. + 1% regulation of output. No phase shift. Output adjustment possible. High speed of correction. No effect on power factor.   Point wise benefits of Servo Voltage Stabilizer   10 to 15 % saving in electricity bill ( More than 25 % on lighting load ) Up to 80 % reduction in breakdown of electrical equipments. Reduction in MDI by 10-15 % Improvement in Power factor Payback period within 6-12 months Improved production of the industry. Uniform Quality of final product. Basic Concept “Shakti” Servo Stabilizer has a solid state circuit which controls the servo motor. The motor is mechanically coupled to the arm of continuously variable auto transformer which feeds to the primary of a Buck/Boost transformer.The stabilizer output voltage is compared with the reference voltage and the resultant error signals control the servo motor providing a true proportional control system rather than On/Off circuit.   Optional Accessories   MCCB / MCB High & Low Voltage Cut -off Output. Electronic Overload Protection. Push Buttons for manual rese.t Single Phasing Preventor. Display of output Load Current.   Fields of Applications   All kinds of Industries like Textile ,Cement Plants ,Cold Storage ,Paper, Oil & Ginning ,Food Processing , Footwear Leather, Mining Dairy Chemical,Automobile,Printing Press, Newspaper etc. And for Hospitals , Nursing Homes , Banks , Colour Labs, ,Jewellers , Hotel, Resorts, Restaurants, Defense, Telecom installations ,Buildings, Commercial Complex, Show Rooms, Residential Installations etc. Also for Elevators, AC Plants , Compressors , Medical Equipments Computers Xerox Machines High Power Music system , CNC Machines etc.

Output Voltage : 220/230/240V 1-ph, 380/400/415 V 3-ph

Operating Frequency : 50 Hz + 5%

Efficiency : 98-99.5% (Based on Capacity & Range)

Cooling : Air / Oil

3-Phase Linear/Roller Types Servo Regulator We are manufacturing Industrial type Automatic Voltage Regulators (Stabilizers) using the differential wound Vertical Roller Type Regulators.LINEAR TYPE Plus/Minus Heavy Duty Regulator is manufactured with rollers rolling on both the sides of the coil. The size of conductor used is much more than that used in conventional design regulators. Being +/- type, the same winding is used for boosting the voltage on one side and bucking the voltage on the other side of the regulator. So the rating of the regulator required is much less than that of the conventional design regulator.The losses of differential wound linear regulator are lesser than the conventional type regulator and due to heavy section of copper used in our regulator, overall size is more and practically the losses of our regulator are much more lesser than the conventional type of regulator. As per the Regulator design, the regulator is technically OUT OF CIRCUIT, when the input voltage is LOWEST/HIGHEST as per the voltage range of the stabilizer while in stabilizer with conventional brush type regulators, the regulator is in the circuit and losses are maximum at LOWEST/HIGHEST voltage as per the range of the stabilizer. QUALITY: CORE: The core is constructed from low loss, cold rolled, grain oriented, annealed laminations of electrical sheet steel conforming to the latest standards using grade M4 laminations for the minimum no load losses. WINDINGS: Regulator Coils are wounded with 4PC paper layer covered copper strip for better insulation. The X-section area of the Electrolytic Grade copper strip used is much higher to give highest quality with minimum losses for the entire running life of the equipment.RADIATORS: Cooling is provided to keep the hot spot temperature as low as possible for higher working efficiency and for all the years with lowest temperature rise even on full load conditions. TANKS & PAINTS: The enclosure/tanks are made of M.S. steel plates / sheets of 3 mm thickness with adequate stiffeners. All the external and internal surfaces are given a primary coat of Epoxy primer and finishing coat of Epoxy paint for better life.OIL: Oil is properly tested for resistivity, dielectric and acidic characteristic conforming to IS 335. Before topping up oil is filtered thoroughly. We use HT grade 11 KV oil even for the LT equipment for better dielectric strength and high flash point.

An isolation transformer is a device which is used to decouple two circuits, the load connected to the output of Isolation transformer and to the input supply. Isolation transformer suppresses electrical noises which occur in the Transmission line, because of the other loads connected in parallel.Shakti isolation transformer provided with Electromagnetic & Electrostatic shielding block transmission of DC signals from one Circuit to other but allows AC signal to transmit. It also prevents interference caused by ground loop.   Few Features of Shakti Isolation Transformer are:   Isolation of primary winding and secondary windings. Electromagnetic & Electrostatic shielding. Very Low Coupling Capacitance. Provide isolated neutral. Protects micro processor based equipment from dangerous noises and reduces failures. Can be useful where machine earth can’t be used. By Providing Delta star isolation transformer in 3-ph models, the problem of earth or neutral in the input side is taken care for the safe operation of the load. It arrest the noises of high frequency and noises generated by the usage of high current MCB,ACB, Induction furnace or other electro magnetic noises.

Standard Fittings   Aluminium plate with transformer details & diagram Oil level indicator ( Flush type ) Conservator with oil filling point Drain point with valve & plug Filter point with valve & plug Thermometer pocket Thermometer ( Dial Type ) Lifting hooks (4 Nos ) Air release plug Silica Gel Breather Explosion vent pipe Mounting channel Earthing Terminals (2 Nos) Radiators ( Fixed Type ) LT Cable Box Unidirectional rollers Bus bar arrangement ( above 315 KVA) HT bushings with arcing horns Inspection Window (250 KVA & above ) Additional neutral bushings for connecting to separate earth.   Optional Fittings Winding Temperature Indicator (WTI) Oil Temperature Indicator (OTI) Magnetic oil level Gauge (MOG) Buchholz Relay Detachable Radiators Marshalling Box (500 KVA & above ) HT Cable Box Off load type tap changing switch ( Externally operated) On Load Tap Changing Switch (OLTC) with Auto Regulator & RTCC.   Transformer Details Design All transformers are designed as per customer specific requirement keeping in mind the stringent requirements of prevailing standards to ensure long & trouble free working of the transformer, Winding Transformer Coils are made from paper covered or super enameled high quality copper or aluminium conductors of EC grade. Windings are done so as to meet all three fundamental requirements i.e. Mechanical, Electrical & Thermal.Press board washers & spacers rigidly support the winding. Interlayer cooling ducts are provided to ensure that the temperature gradient between winding & oil hense the hot temperature spot is minimized & high life expectancy is achieved., InsulationThe insulating material is selected keeping in mind electrical mechanical & thermal properties of it. The principle component of insulation is pre-fabricated press board sheet.CoreAll Transformers are made with firm interleaved low loss cold rolled grain oriented (CRGO) silicon steel laminations with mitred joint design to ensure low losses, low magnetizing current & low noise. Stamping has insulating material coating on both side which is oil & heat resistant.TankAll tanks are made from hot rolled mild steel plates which are electrically welded. Suitable stiffeners are provided for robust construction. Sufficient cooling radiators made from pressed steel fins or elliptical tubs are provided to maintain the temperature rise within specified limits. All tanks are pressure tested before painting to ensure zero leakage.PaintTransformer Tank & all other fabricated items are thoroughly cleaned before painting. The interior of the tank is painted with two coats of oil & heat resistant zinc chromate primer. It is also applied to the tank exterior before applying two coats of weather proof very durable anti corrosive epoxy based synthetic paint.OilThe oil used for insulation, impregnation and as a coolant complies to IS-335 Every consignment received is throughly tested for all parameters like di-electric strength, acidity, resistivity, flash point etc before use.TestingEach Transformer is properly tested for all routine tests as per IS : 2026 with best of the available testing panel and meters regularly calibrated from approved labs. Any other specific test can be done on special demand of the customer on initial agreement.After Sales ServiceShakti believes in building relations beyond business so special emphasis is given to quality assuring long and trouble free working of our products. Even then just in case there is any trouble in the unit our expert service engineer is promptly deputed for rectification of the problem. We have a team of highly skilled and well trained expect service engineer at your disposal at all time.

Standard : All transformers are designed manufactured and tested as per IS-1180 & IS-2026 (or any other prevailing standard)

Capacity : 16 KVA to 2500 KVA

Type : Indoor or Outdoor

Voltage : HV : 33 KV, 11 KV , 6.6 KV or 3.3 KV, LV : 11 KV, 6.6 KV, 3.3 KV or 0.433 KV

Step Down Transformers can be supplied in both auto wound type or isolated type.

Step Up Transformers are supplied for the areas, where the supply voltage is usually very low.

Booster Transformers are supplied for the areas, where the supply voltage is usually very low.