AMTAC Power Solutions offer the Transformer for the Marine and Industrial segment. Brief on the same has been depicted as follow:

A) Power transformers

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AMTAC Power Solutions offers power transformers which are key components in power networks. Their availability and longevity have a major impact on grid reliability and profitability. AMTAC Power Solutions does not compromise on quality. We ensure that every one of our delivered units has undergone rigorous full-acceptance testing. AMTAC Power Solutions offers a complete range of power transformers and related components and parts.

Our entire range is the result of our own research, development, and manufacturing, which makes us unique in the industry. This has given us extensive experience in every relevant part of power transformer technology. Customers worldwide can securely rely on the quality and reliability of our products.

Applicable Standards

IEC / ANSI /BS / IS / SABS/ CENELEC /GOST/ JIS/DIN

Salient Features

  • Pioneering technology – best short circuit record in the industry
  • Industry leading ‘Mean time between failure rate (MTBF)’
  • The complete customer service package (from quotation to Commissioning)
  • Short circuit performance at twice the industry standard
  • One global approach – bringing consistency, delivery performance and technology
  • Compact design to meet transportation limits, including the possibility of lay down transportation.
  • Exceptional mechanical robustness and natural ability to withstand short circuit events and transportation accelerations.
  • As the technology pioneer, GMDT has the flexibility to electrically and mechanically match existing units that make it the best option for replacement of transformers, meeting dimensional and connection arrangements and impedance requirements, even those with low impedances, high impedances to tertiary winding and lay-down operation.
  • Available in Stack core
  • Modern manufacturing techniques ensuring quality of product
  • Robust build designed to withstand electric impulses, thermal and dynamic stress
  • Trouble free performance
  • Customized design and specification demands
  • GMDT’s patented concept
  • Customized solution to meet every contingency
  • Proven track record in meeting customer
  • performance requirements.
  • Design technology eliminates the risk of a hot spot
  • Outstanding thermal performance resulting from directed oil flow, minimization of losses and control of the hot spot

We offers following Power transformers

  • Generator step-up transformers (GSU)
  • HVDC converter transformers
  • Shell specialty transformers
  • System intertie transformers
  • Unit Auxiliary Transformer
  • Station Auxiliary Transformer
  • Interconnecting Transformer (Auto Transformer)
  • Trackside Transformer for Railways

B) Distribution Transformers

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AMTAC Power Solutions offers a wide range of distribution and medium power transformers for Marine and industrial application. These transformers can be free breathing or hermetically sealed. Conventional transformers are fitted with a conservator with breather for free breathing while hermetically sealed are without breathing with bolted cover. Wide range of transformers in accordance to respective standards with different combinations can be constructed.

Distribution transformers for Marine and industrial application is available in 3 or 1 phase version with appropriate primary and secondary voltages. We offers single phase distribution transformers, three phase distribution transformers and industrial distribution transformers.

These single phase distribution transformers and three phase distribution transformers are available with ‘Tap Changer’ options as well as “Off Circuit Manually Operated” and “On Load Tap Changer” (OLTC) with AVR and RTCC panel.

Three Phase Distribution Transformers
Distribution transformers are normally located at a service drop, wires run from a utility pole or underground power lines to a customer’s premises. They are often used for the power supply of facilities outside settlements, such as isolated houses, farmyards or pumping stations at relevant voltages.

AMTAC Power Solutions makes three phase distribution transformers are available in stack core / wound core. They are made available in aluminium / copper as per requirement.

Single Phase Distribution Transformers
At AMTAC Power Solutions, we offer single phase transformers in CRGO Steel core as well as Amorphous Metal core in line with the client requirement. Single-phase distribution transformers are widely used by utilities to provide 24hour electricity supply in rural areas.

We are in a position to offer any specially designed voltage distribution transformers for special purposes as per customer’s requirements and specifications. Due to the versatile design, unmatched quality and unquestionable performance, these distribution transformers are widely demanded in the market.

Prime quality, low loss, high permeability “Cold Rolled Grain Oriented” silicon steel is used for core to achieve low no load losses.

These industrial distribution transformers have electrolytic copper with insulating paper multi covered round wires and strips are used for both the primary and secondary windings to achieve low load losses.

Copper foil winding technology is used for high current sections to achieve following advantages:

  • Sustaining short circuit forces without any distortion in low voltage and high current windings
  • Hot spot in LV windings regulated
  • No transposition, stray losses are minimal. Thus total copper losses are also further reduced
  • Total copper losses reduced vis-a-vis standard losses. Thus heat dissipating area also reduces
  • ONAN cooling with conventional pressed steel radiators or corrugated walls are provided for special Transformers ONAF cooling with fans for specific requirements. The terminal of these single phase distribution transformers and three phase distribution transformers arrangement for primary and secondary voltage are decided as per site requirements. Low viscosity transformer oil is provided with in numerous superior grades for specific usage

Applicable Standards

IEC / ANSI /BS / IS / SABS/ CENELEC / GOST

Salient Features

  • Hermitically Sealed and Conservator type of construction
  • Robust design to take care of frequent short circuits
  • Excellent process of shrinkage and drying of coils resulting in a sturdy construction
  • Manufactured with prime CRGO using step-lap design for low losses
  • Stepdown Transformers
  • Stepup Transformers
  • Energy Efficient Tranformers
  • Transformers ment for Solar and Wind Applications
  • Transformers ment for Mines Applications

C) Furnace Transformers

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We offer furnace transformers and arc furnace transformers for arc furnace/ submerged arc furnace/ induction furnace applications.

In the furnace transformers, we use superlative materials that make the transformer highly durable and resistive to various climatic factors. The customers are facilitated to place the orders according to the requirement as the transformers are available in different current transforming capacities. Low maintenance, unmatched quality and unquestionable performance has made the arc furnace transformers highly demanded in the national as well as in the international market.

Electric Arc Furnace (EAF) Transformers are required for many different furnace processes and applications.

They are built for steel furnace, ladle furnace and ferroalloy furnace, and are similar to short or submerged Arc Furnace Transformers.

EAF Transformers operate under very severe conditions with regard to frequent over currents and over voltages generated by short circuits in the furnace and the operating of HV circuit-breaker.

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Transformers for alternating current electric-arc furnaces (AC EAFs) are utilised throughout the steel industry. They are used to power arc furnaces for the production of steel, which require high levels of power that must also be variable due to the frequent short-circuits, and also to power arc furnaces for the production of special alloys – these alloys often require the deployment of three single-phase furnace transformers instead of a single three-phase transformer.

These transformers must be designed to resist the high levels of electrical, thermal and mechanical stress to which they are subject during utilisation.

Other elements that must be taken into consideration when designing transformers for electric-arc furnaces are the high secondary currents required for the fusion process (dozens of kA) and the wide range of secondary voltages, which are normally regulated by an on-load tap changer (OLTC), either directly on the high-voltage winding or via an intermediate booster located within the same tank.

An additional option that is now often used in furnace transformers is the closure of the secondary electrical circuit (triangle) within the transformer tank. Furnace transformers are often used in series with an on-load tap changer (OLTC) or a no-load tap changer (NLTC), which serves to enhance the stability of the arc. The reactor can be built inside the main transformer cabinet, or alternatively, it can be entirely separate from it or located next to it.

This solution makes it possible to eliminate the costs of cabling the MV connections between the transformer and the reactor, thus making it possible to carry out maintenance work on the reactor without having to shut off the transformer. In this way, the overall reliability of the system can be enhanced.

The experience that GMDT has built up has allowed to company to become a leading brand both nationally and internationally in the furnace transformers market. The company’s products are used across a wide spectrum of applications by a plethora of major clients.

Applicable Standards

IEC / ANSI /BS / IS / SABS/ CENELEC / GOST

Specifications

  • “Off Circuit Manually Operated” and “On Load Tap Changer” (OLTC) with AVR and RTCC panel
  • OFWF cooling with ONAN cooling optional
  • ONAN cooling with conventional pressed steel radiators
  • Requisite series reactors for arc furnace transformers to reduce the short circuit stresses generated in transformer during the furnace operation
  • Designed to withstand the harmonics generated due to furnace operation
  • ‘Tap Changer’ options available in these furnace transformers, arc furnace transformers and electric arc furnace transformers.

Design options of Electric Arc Furnace (EAF) Transformers

  • Direct or indirect regulation
  • On-load or off-circuit tap changer
  • Built-in reactor for long arc stability
  • Air or water-cooled secondary bushing
  • arrangements and designs
  • Internal secondary phase closure (internal delta)

Furnace Transformer

  • Arc Furnace Transformer
  • Submerged Arc Furnace Transformer
  • Ladle Furnace Transformer
  • Induction Furnace Transformer
  • DC Arc Furnace Transformer

Salient Features

  • Industry leading ‘Mean time between failure rate (MTBF)’
  • The complete customer service package (from quotation to Commissioning)
  • One global approach – bringing consistency, delivery performance and technology
  • Compact design to meet transportation limits, including the possibility of lay down transportation.
  • Modern manufacturing techniques ensuring quality of product
  • Robust build designed to withstand electric impulses, thermal and dynamic stress
  • Trouble free performance
  • Customized design and specification demands
  • Customized solution to meet every contingency
  • Design technology eliminates the risk of a hot spot
  • Outstanding thermal performance resulting from directed oil flow, minimization of losses and control of the hot spot
  • Robust design to take care of frequent short circuits
  • Excellent process of shrinkage and drying of coils resulting in a sturdy construction

D) Earthing Transformers

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An earthing transformer is usually associated with three-phase supply systems.

On a three-phase system, the neutral would be earthed either directly or through some limiting impedance / resistance. When the neutral point is not available or does not exist with a delta secondary winding of the transformer, a neutral point needs to be created. This is the purpose of the earthing transformer, which could consist of a zig- zag winding, or a two-winding star delta transformer where the star winding of correct voltage supplies an accessible neutral point when connected to the supply system.

Earthing transformers are classified as standard reactors. An earthing transformer (neutral coupler) is a three-phase transformer connected to the power system to provide a neutral connection for earthing, either directly or via impedance. The earthing transformers may in addition supply a local auxiliary load.

The earthing transformer creates a neutral point for a network. ZN connection is usually applied. Z connection provides linear and specified zero sequence impedance. YN+d can also be applied.

A Earthing ( zigzag ) transformer is a special purpose transformer with a zigzag or ‘interconnected star’ winding connection, such that each output is the vector sum of two phases offset by 120°.

Its applications are for the creation of a missing neutral connection from an un-grounded, 3-phase system to permit the grounding of that neutral to an earth reference point and also harmonic mitigation, as it can suppress triplet (3rd, 9th, 15th, 21st, etc.) harmonic currents, to supply 3-phase power as an auto transformer (serving as the primary and secondary with no isolated circuits), and to supply non-standard phase-shifted 3-phase power.

Nine-winding three-phase transformers, typically have 3 primaries and six identical secondary windings which be used in zigzag winding connection. As with the conventional delta or wye winding configuration three-phase transformer, a standard stand-alone transformer containing only six windings on three cores can also be used in zigzag winding connection, such transformer sometimes being referred to as a zigzag bank. In all cases, six or nine winding, the first coil on each zigzag winding core is connected contrariwise to the second coil on the next core. The second coils are then all tied together to form the neutral and the phases are connected to the primary coils. Each phase, therefore, couples with each other phase and the voltages cancel out. As such, there would be negligible current through the neutral point, which can be tied to ground.

Each of the three “limbs” are split into two sections. The two halves of each limb have the equal number of turns and they’re wound in opposite directions. With the neutral grounded, during a phase to ground short fault, a third of current returns to the fault current and the remainder must go through two of the three phases when used to derive a grounding point from a delta source.

If one phase, or more, faults to earth, the voltage applied to each phase of the transformer is no longer in balance; fluxes in the windings no longer oppose. (Using symmetrical components, this is Ia0 = Ib0 = Ic0.) Zero sequence (earth fault) current exists between the transformer’s neutral to the faulting phase. The purpose of a zigzag transformer in this application is to provide a return path for earth faults on delta-connected systems. With negligible current in the neutral under normal conditions, providing the defective load will be automatically disconnected in a fault condition, an undersized transformer may be used only as short time rating is required (i.e. the transformer can only carry full rated current for, say, 60 s). Impedance should not be too low for desired maximum fault current. Impedance can be added after the secondaries are summed to limit maximum fault currents.

Applicable Standards

IEC / ANSI /BS / IS / SABS/ CENELEC / GOST

Application in following industries
Chemical, Pharmaceuticals, Steel, Textile, Engineering, Plastic, Cement, Refineries, Mining, Captive Power Projects, Hydro Power Projects, Wind Mill Farms, Construction Houses, Pharma, Electrical, Electronics, Renewable Energy, Automobile.

Salient Features

  • Optimized design fully in line with substation system design
  • Lots of references in different voltage systems and substation configurations
  • Respectful with people and property
  • Powerful engineering and GMDT design
  • Customized solutions for all customers