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Auto Transformer : Introduction : An autotransformer (sometimes called autostep down transformer ) is an electrical transformer with only one winding. The " auto " (Greek for "self") prefix refers to the single coil acting alone 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", autotransformers 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 autotransformers include lower leakage reactance, lower losses, lower excitation current, and increased VA rating for a given size and mass. Operation : An autotransformer 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 autotransformers can be formulated the same as other two-winding transformers. (0
Isolation Transformer: used to establish a new neutral-ground bond in order to correct common mode and other grounding problems. A transformer can provide conversion of a Delta system (3 wire) to a Wye connected (4 wire) system. A shielded isolation transformer provides excellent protection from all types of N-G disturbances (impulses, RMS voltage, and high frequency noise). It also protects against voltage transients and spikes while offering full rd galvanic isolation, traps 3 harmonic and triplen harmonics. We hereby introduce ourselves as a manufacturer of dry type power transformers and reactors. We are established in this field since 2003. Our Dry Type Transformer adopt high quality low loss silicon sheet and arranged non-bobbin coil winding technology, and we apply vacuum pressure impregnating (VPI) process and solidify baking process to achieve insulation class H or C. Our transformers are widely used on any occasions where voltage is below 1000V and frequency below 400 Hz, and equipment’s which require voltage to step up or down. For small to medium capacity transformers, we apply enamel wire winding, and we apply foil winding for large capacity ones. Features 1) There are air flows between coil's layer to layer and between coil to core, resulting fast heat dissipation, and low temperature rise. 2) High grade iron core and winding can be wire or foil. 3) Small volume, light weight and good workmanship. 4) After vacuum pressure impregnating, the whole transformers and reactors are moisture proof and mildew proof. Insulation class H or C. 6) Lower audio noise. 7) Nomex based insulation system for foil winding transformers. Type 1) Step up Isolation Transformer 2) Step down Isolation Transformer Testing Our all magnetics are tested as per routine test mentioned as per IS2026. We can carry out other type testing as per your need. Applications of Isolation Transformers There is also some special application of isolating transformers, such us pulse transformers which transmit rectangular pulse signals and provide the electrical isolation. This type is suitable in some computer network designs, CNC machines, etc. Our products range is as under: 1) Single/3 phase Transformer, upto 300KVA, 50Hz - 400Hz. 2) Scott Connected (3phase - 2phase conversion)/ Open delta type (3phase--single phase conversion) 3) Input Chokes for A.C/D.C Drives, from 1hp to 750hp drives 4) Output Chokes for A.C/D.C Drives, from 1hp to 750hp drives 5) DC filter choke 6) Harmonic Filter Choke 7) Transformers for Plasma Welding Machines 8) Transformers with induction heating purpose.
TRANSFORMER : Introduction: A Transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction. A varying current in one coil of the transformer produces a varying magnetic field, which in turn induces a voltage in a second coil. Power can be transferred between the two coils through the magnetic field, without a metallic connection between the two circuits. Faraday's Law of Inductioniscovered in 1831 described this effect. Transformers are used to increase or decrease the alternating voltages in electric power applications. Since the invention of the first constant-potential transformer in 1885, transformers have become essential for the transmission,distribution and utilization of alternating current electrical energy. A wide range of transformer designs is encountered in electronic and electric power applications. Transformers range in size from RF transformers less than a cubic centimeter in volume to units interconnecting the power grid weighing hundreds of tons. History : Electromagnetic Induction, the principle of the operation of the transformer, was discovered independently by Micheal Faraday in 1831, Joseph Henry in 1832, and others.The relationship between EMF and magnetic flux is an equation now known as Faraday's Law of Induction: . where is the magnitude of the EMF in Volts and Φ B is the magnetic flux through the circuit in webers. Faraday performed early experiments on induction between coils of wire, including winding a pair of coils around an iron ring, thus creating the first torodial closed-core transformer. However he only applied individual pulses of current to his transformer, and never discovered the relation between the turns ratio and EMF in the windings. Types : Step Up Transformer : The Transformer in which Load Connected winding (Secondary Winding ) Voltage is greater than Source Connected Winding (Primary Winding) Voltage . Step Down Transformer : The Transformer in which Load connected winding (Secondary winding) voltage is less than source connected winding ( Primary Winding) Voltage.
A voltage regulator is designed to automatically maintain a Constant Voltage level. A voltage regulator may use a simple feed forward design or may include negative feedback. It may use an ElectroMechanical mechanism, or Electronic Components. Depending on the design, it may be used to regulate one or more AC or DC voltages. Electronic voltage regulators are found in devices such as computer Power Supplies where they stabilize the DC voltages used by the processor and other elements. In automobile Alternators and central Power Station Generator plants, voltage regulators control the output of the plant. In an Electric Power Distribution system, voltage regulators may be installed at a Substation or along Distribution Lines so that all customers receive steady voltage independent of how much power is drawn from the line. Automatic Voltage Regulator : Generators, as used in power stations or in standby power systems, will have automatic voltage regulators (AVR) to stabilize their voltages as the load on the generators changes. The first automatic voltage regulators for generators were electromechanical systems, but a modern AVR uses solid-state devices. An AVR is a feedback control system, that measures the output voltage of the generator, compares that output to a set point, and generates an error signal that is used to adjust the excitation of the generator. As the excitation current in the field winding of the generator increases, its terminal voltage will increase. The AVR will control current by using power electronics devices; generally a small part of the generator's output is used to provide current for the field winding. Where a generator is connected in parallel with other sources such as an electrical transmission grid, changing the excitation has more of an effect on the Reactive Power produced by the generator than on its terminal voltage, which is mostly set by the connected power system. Where multiple generators are connected in parallel, the AVR system will have circuits to ensure all generators operate at the same Power Factor. [1] AVRs on grid-connected power station generators may have additional control features to help stabilize the electrical grid against upsets due to sudden load loss or faults.
Introduction to Stabilizer: The embedding of microprocessor chip technology and power electronic devices in the design of intelligent AC voltage stabilizers (or automatic voltage regulators (AVR)) led to produce high-quality, stable electric power supply in the event of significant and continuous deviation of mains voltage. As advancement to the conventional relay type voltage stabilizers, modern innovative stabilizers use high performance digital control circuits and solid state control circuitry that eliminates potentiometer adjustments and allows the user to set voltage requirements through a keypad, with output start and stop facility. What is a Voltage Stabilizer? It is an electrical appliance which is designed to deliver a constant voltage to a load at its output terminals regardless of the changes in the input or incoming supply voltage. It protects the equipment or machine against over voltage, under voltage, and other voltage surges. Why Voltage Stabilizers Are Needed? Generally, each and every electrical equipment or device is designed for a wide range of input voltage. Depending on the sensitivity, the working range of the equipments are limited to a specific values, for instance, some equipments can tolerate ± 10 percent of the rated voltage while others ± 5 percent or less. The voltage fluctuations (rise or dip of the magnitude of rated voltage) are quite common in many areas, especially at terminated lines. The most common reasons for voltage fluctuations are lighting, electrical faults, faulty wiring and periodic turning off the device. These fluctuations create mishap to the electrical equipments or appliances Servo Controlled Voltage Stabilizers These are simply termed as servo stabilizers (work on servomechanism which also known as negative feedback) and the name suggests it uses a servo motor to enable the voltage correction. These are mainly used for high output voltage accuracy, typically ±1 percent with input voltage changes up to ± 50 percent. The figure below shows the internal circuit of a servo stabilizer which incorporates servo motor, auto transformer, buck boost transformer, motor driver and control circuitry as essential components. In this stabilizer, one end of buck boost transformer primary is connected to the fixed tap of the auto transformer, while other end is connected to the moving arm that is controlled by the servo motor. Secondary of the buck boost transformer is connected in series with incoming supply which is nothing but stabilizer output. Electronic control circuit detects the voltage dip and voltage rise by comparing the input with built-in reference voltage source. When the circuit finds the error, it operates the motor that in turn moves the arm on the autotransformer. This could feed the primary of buck boost transformer such that a voltage across the secondary should be the desired voltage output. Most servo stabilizers use embedded microcontroller or processor for the control circuitry to achieve intelligent control. These stabilizers can be single-phase, three-phase balanced type or three-phase unbalanced units. In single phase type, a servo motor coupled to the variable transformer achieves the voltage correction. In case of a three-phase balanced type, a servo motor is coupled with three auto transformers such that stabilized output is provided during fluctuations by adjusting the output of the transformers. In an unbalanced type of servo stabilizers, three independent servo motors coupled with three auto transformers and they have three separate control circuits. There are various advantages of using servo stabilizers compared with relay type stabilizers. Some of these are higher correction speed, high precision of stabilized output, capable to withstand inrush currents, and high reliability. However, these require periodic maintenance due to the presence of motors.
Auto transformer is kind of electrical transformer where primary and secondary shares same common single winding. So basically it’s a one winding transformer. We hereby introduce ourselves as a manufacturer of dry type power transformers and reactors. We are established in this field since 2003. Our Dry Type Transformer adopt high quality low loss silicon sheet and arranged non-bobbin coil winding technology, and we apply vacuum pressure impregnating (VPI) process and solidify baking process to achieve insulation class H or C. Our transformers are widely used on any occasions where voltage is below 1000V and frequency below 400 Hz, and equipment’s which require voltage to step up or down. For small to medium capacity transformers, we apply enamel wire winding, and we apply foil winding for large capacity ones. Features 1) There are air flows between coil's layer to layer and between coil to core, resulting fast heat dissipation, and low temperature rise. 2) High grade iron core and winding can be wire or foil. 3) Small volume, light weight and good workmanship. 4) After vacuum pressure impregnating, the whole transformers and reactors are moisture proof and mildew proof. Insulation class H or C. 5) Lower audio noise. 6) Nomex based insulation system for foil winding transformers. Type 1). Step up Auto Transformer 2). Step down Auto Transformer Testing Our all magnetics are tested as per routine test mentioned as per IS2026. We can carry out other type testing as per your need. Applications of Auto Transformers Compensating voltage drops by boosting supply voltage in distribution systems. Auto transformers with a number of tapping are used for starting induction and synchronous motors. Auto transformer is used as variac in laboratory or where continuous variable over broad ranges are required. Our products range is as under: 1) Single/3 phase Transformer, upto 300KVA, 50Hz - 400Hz. 2) Scott Connected (3phase - 2phase conversion)/ Open delta type (3phase-single phase conversion) 3) Input Chokes for A.C/D.C Drives, from 1hp to 750hp drives 4) Output Chokes for A.C/D.C Drives, from 1hp to 750hp drives 5) DC filter choke 6) Harmonic Filter Choke 7) Transformers for Plasma Welding Machines 8) Transformers with induction heating purpose.
Our Dry Type Transformer adopt high quality low loss silicon sheet and arranged non-bobbin coil winding technology, and we apply vacuum pressure impregnating (VPI) process and solidify baking process to achieve insulation class H or C. Our transformers are widely used on any occasions where voltage is below 1000V and frequency below 400 Hz, and equipments which require voltage to step up or down. For small to medium capacity transformers, we apply enamel wire winding, and we apply foil winding for large capacity ones. Features • There are air flows between coil's layer to layer and between coil to core, resulting fast heat dissipation, and low temperature rise. • High grade iron core and winding can be wire or foil. • Small volume, light weight and good workmanship. • After vacuum pressure impregnating, the whole transformers and reactors are moisture proof and mildew proof. • Insulation class H or C. • Lower audio noise. Type Isolation Transfonner: used to establish a new neutral­ ground bond in order to correct common mode and other grounding problems. A transformer can provide conversion of a Delta system (3 wire) to a Wye connected (4 wire) system. A shielded isolation transformer provides excellent protection from all types of N-G disturbances (impulses, RMS voltage, and high frequency noise). It also protects against voltage transients and spikes while offering full galvanic isolation, traps 3rd harmonic and triplen harmonics.
Constant Voltage Transformer : When faced with an extreme transient such as a local lighting strike, the CVT will present a low impedance to the mains protecting both itself and any connected loads. The ferro-resonant transformer technology ensures that CVT will generate a perfect sine wave output even when fed from square or quasi-square wave sources. A CVT is also the most efficient way to drive a switched mode power supply(SMPS), and provides harmonic buffering. Features : Galvanic isolation High common and normal mode noise attenuation Sag, surge and brownout protection Sine wave output (regardless of input waveform) Low installation heat output and running costs (maintenance free) High Mean Time Between Failure (MTBF) Easy to install Application : Process control Automation Computer system Broadcasting Medical Air, rail, ship
VOLTAGE STABILIZER : All electrical and electronic systems are designed and manufactured to operate at maximum efficiency with a given supply voltage, called the nominal operating voltage. For various reasons the voltage of the energy distribution does not remain constant, showing considerable fluctuations in the nominal value, which leads to the apparatus, not only a loss of efficiency (sometimes even the impossibility of operation), but also a significant increase in failure rate. The Stabilizers are electronic devices responsible for correcting the voltage of the electrical power supply to provide a stable and secure power supply to equipments, allowing for a stable voltage and protecting the equipment from most of the problems of the mains. Like UPS, Voltage Stabilizers are an asset to the protection of electrical and electronic equipment. The main function of a Stabilizer is to make the output voltage that feeds the equipments connected to it as much as possible equivalent to the ideal electrical power supply, ensuring that the oscillations in electrical power are offset, and its output maintain a stable value, preventing them from being experienced by equipments and thereby avoiding their damage. Most Stabilizers also have electronic filters whose purpose is to suppress noise and peak voltage.
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