Voltamp Electricals Pvt. Ltd.

Sarat Bose Road, Kolkata, West Bengal

We offer Distribution Transformers with Class A insulation, ONAN cooling type, and a rated capacity ranging from 25 kVA to 2500 kVA. These transformers are designed for primary voltages of 11 kV, 22 kV, or 33 kV, and secondary voltages of 433 V (3-phase) or 230 V (1-phase). Operating at a standard frequency of 50 Hz, they come in 1-phase or 3-phase configurations and can be pole-mounted, pad-mounted, or foundation-mounted. Our transformers comply with IS 1180 (Part 1) standards, making them ideal for various applications in the manufacturing industry.

We offer high-quality Power Transformers ranging from 2.6 MVA to 20 MVA, designed for 3-Phase applications as per IS 2026 standards. Our transformers are suitable for voltage classes up to 33 kV and operate at frequencies of 50 Hz or 60 Hz. As a leading manufacturer in the industry, we ensure reliable and efficient power solutions to meet your needs.

We offer high-quality Dry-Type Distribution Transformers with exceptional efficiency of 98.5% as per BEE/IS energy efficiency levels. Featuring a standard Vector Group of Dyn11, a Tapping Range of 10% upto -20% @ 2.5%, and Losses as per ECBC or Customer Specifications. With a Temperature Rise 90C (winding) and Thermal Class options of F (155C) or H (180C), our transformers are designed for optimal performance and reliability. Ideal for manufacturers seeking top-tier electrical solutions that meet stringent energy efficiency standards.

Type: Hermetically sealed oil-immersed or dry-type (cast resin) transformers.Power Rating: Upto 2500 kVA.Primary Voltage: Up to 33 kV.Secondary Voltage: 0.415 kV.Vector Group: Usually Dyn11.Impedance: Starting from 4.5%, depending on design.

Built to handle the rapid voltage fluctuations and surges that come from inverters. Usually comes with reinforced insulation, often with epoxy-resin coating or Nomex/Mylar barriers.Helps reduce voltage drop during load variations. Minimizes losses and improves efficiency under VFD operation.

Converter Duty Transformers are used to supply power to converters in industrial applications like electrolysis, traction, steel plants, cement plants, and HVDC transmission. Unlike conventional transformers, CDTs handle high harmonic content, unbalanced loading, and frequent switching stresses. 2. Key ApplicationsRectifier-fed drives (DC furnaces, traction)Inverter systems (AC drive systems)HVDC systemsVariable Frequency Drives (VFDs)Electrochemical and metallurgical industries3. Design Considerationsa. Electrical ParametersVoltage range: Typically from 11 kV to 400 kV on primary side; secondary voltages vary per converter design.Current rating: High current handling (can exceed 20 kA).Impedance: Designed to manage short-circuit currents and reduce harmonic effects.Phase shift: Multi-winding or phase-shifting transformers are used to reduce harmonic distortion (e.g., 12-pulse, 24-pulse configurations).b. Harmonics and Waveform DistortionSpecial design to handle non-sinusoidal load currents.Windings are arranged to minimize harmonic propagation into the grid.4. Construction FeaturesCore: High-grade CRGO steel or amorphous metal; laminated to reduce eddy current losses.Windings: Copper with insulation suitable for high-frequency switching stresses.Tapping: Off-circuit or on-load tap changers (OLTC) for voltage regulation.Insulation Class: Often Class F or H, depending on thermal requirements.Cooling: ONAN, ONAF, OFAF, or OFWF as per duty cycle and power rating.Short-circuit strength: Designed to withstand mechanical stresses from DC fault currents.

Power Capacity: Typically ranges from 1 MVA to 120 MVA, depending on furnace size and application.Primary Voltage: Up to 33 kV; common values include 6.6 kV, 11 kV, and 22 kV.Secondary Voltage: Low voltage outputs, generally between 100 V to 1, 000 V, to accommodate high current requirements.Frequency: Standard operation at 50 Hz or 60 Hz.Phase Configuration: Available in both single-phase and three-phase designs.Vector Group: Commonly Dyn11, facilitating phase shift and grounding considerations. 2. Current and ImpedanceSecondary Current: Designed to handle extremely high currents, often in the range of 10 kA to 60 kA, depending on furnace requirements.Impedance Voltage: Typically between 4.5% and 21%, balancing voltage regulation and fault current limitations. 3. Cooling MethodsCooling Types:ONAN: Oil Natural Air NaturalONAF: Oil Natural Air ForcedOFAF: Oil Forced Air ForcedOFWF: Oil Forced Water Forced

We offer high-quality Earthing Transformers designed for the Electric Industry, with Automatic Grade ensuring efficient performance. Our transformers provide a neutral point and ground fault current path, suitable for voltage classes ranging from 3.3 kV to 66 kV (commonly 11 kV) at 50 Hz / 60 Hz frequency. Rated Continuous Current is as per system design, with Short-Time Current Rating typically included. These transformers feature Oil-Immersed insulation medium, meeting industry standards. As a Manufacturer, we prioritize reliability and functionality in our products.

Powering underground drills, conveyors, crushers, and lighting systems Supplying voltage to mobile mining equipment Step-down transformation from medium voltage (MV) to low voltage (LV) for equipment use Portable substation applications in open-pit and underground mines 3. Design Considerations a. Electrical Parameters Primary Voltage: Typically 3.3 kV, 6.6 kV, 11 kV, 22 kV (MV range) Secondary Voltage: 415 V, 690 V, or other LV values depending on mining equipment Frequency: 50 Hz or 60 Hz Power Ratings: Typically ranges from 500 kVA to 5 MVA Impedance: Customized to suit system protection coordination b. Duty Type Designed for continuous or cyclic duty under load Must accommodate frequent starts and stops of mining equipment

We offer the Scott-T Transformer, designed for efficiency and reliability. With a Primary Voltage of 3-phase and Secondary Voltage of 2-phase output, this transformer ensures seamless power distribution. Operating at a Frequency of 50 or 60 Hz, it features a Phase Shift of 90 between two-phase outputs. The Tap Position ranges from 50% to 86.6% from the main's neutral point, ideally at 0.866 Vline. Trust this transformer for consistent performance in your manufacturing processes.

A High-Current Transformer is a specially designed transformer that delivers very high current at low to moderate voltage levels. These transformers are typically used for industrial processes like electrolysis, arc furnaces, welding, and testing laboratories. 2. ApplicationsElectric arc furnaces (EAF)Induction heating systemsElectroplating and electrolysisHigh-current test benches (e.g., for circuit breakers, cables)Resistance weldingShort-circuit testing in labsOvercurrent relaysTemperature sensors (OTI, WTI)Cooling system interlocksCurrent and voltage monitoringBuchholz relay (for oil-filled types)

An Automatic Voltage Regulator (AVR) is a device used with power transformers to maintain a constant output voltage regardless of load or input voltage fluctuations. It plays a crucial role in voltage regulation, grid stability, and power quality. 2. ApplicationsPower distribution transformersIndustrial power systemsGenerator step-up (GSU) transformersGrid substationsRenewable energy integration (solar/wind transformers)

ApplicationsPower supply to two-phase systems (e.g., older industrial machinery)Traction systems (railways with two-phase motors)Balancing unbalanced loadsInterfacing two-phase legacy systems with modern three-phase grids3. Basic ConfigurationA Scott-T transformer uses two single-phase transformers: Main transformerTeaser transformerConnection Details:The main transformer is connected between two phases (e.g., A and C) of a three-phase system.The teaser transformer is connected from the third phase (B) to a tap on the main transformer winding (typically at 86.6% or 3/2 of the winding).

We offer high-quality HT Oil Immersed Isolator Switch Fuse Units designed for high tension applications. Our units support voltage requirements for single or three-phase systems, with a frequency range of 50-60 Hz. The current rating varies based on the model chosen, ensuring flexibility for different needs. Operating temperatures are optimized for reliable performance, varying according to the specific model. As a leading manufacturer, we provide efficient and durable solutions for your electrical power needs.