MaestroServo

SPECIFICATIONS

HT DISTRIBUTION TRANSFORMER

MAESTRO provides a wide range of Oil Filled Distribution Transformers that conform to the IS and international standards of quality and safety. These transformers are designed and developed using the latest technologies and can be provided with a variety of terminations to suit the requirements for new installation of products. Optimum efficiency can be ensured by delicate proportioning of core and winding loss using CRGO M3 to M5 MOH Lamination and Electrolytic Grade 99.9% pure copper, with Transposition in L.V. coil for current sharing in parallel Conductors, Electric grade mineral oil, press paper, and boards. Thus better regulation is achieved resulting in longer life. Careful and precise design also reduces noise levels to the minimum.

PRODUCT

CORE

MAESTRO makes Sealed/Conventional, Single/Three Phase, 50 Hz aluminum/copper double wound, oil immersed, continuous heavy-duty transformers that are designed with Class A / Class F insulation to withstand short circuit and impulse test standards. These are robust and durable machines that last for many years.

The core used is made from best-grade imported cold-rolled grain-oriented silicon steel laminations with the hi-tech latest technique of annealing. With reduced core losses and magnetizing the current considerably, the core is specially designed to sustain over-fluxing up to 12.5%. Individual stamping is insulated on both sides with oil and temperature-resistant insulating material. The core is stamped with steel channels rigidly to reduce the sound level and earthed with an electrical grade copper sheet.

WINDING

TANK & RADIATOR

The winding is of different types 1)Spiral 2)Crossover 3)Helical 4)Disc, designed to withstand the optimum electrical, mechanical, dynamic, and thermal stresses depending upon the current and voltage. The coils are wound with an electrolytic grade high conductivity, annealed wire, and strips covered with high-quality insulation. All coils are reinforced, insulated, and impregnated with insulating varnish to withstand the effect of short circuits and impulse voltage shocks. Cooling ducts are provided to minimize the hotspot temperature and temperature gradient between winding and oil.

The Tanks are made from prime-quality mild steel sheets, plates, and pipes by electrical welding. Proper bracing and stiffeners are provided for robust construction. The tanks are tested as specific pressure for leakage at joints. Sufficient cooling radiators are provided for maximum dissipation of heat during extreme ambient temperatures. The radiators are made from best-grade presses steel fins or elliptical tubes.

PAINTING

INSULATING AND OIL

The tank surface exposed to the atmosphere is galvanized/painted with two coats of red oxide paint to provide maximum resistance to corrosion and two coats of epoxy-based anti-corrosion enamel paint. The surface in contact with oil is treated with two coats of 'Oil and Heat Resistant paint. This paint has more effective resistance compared to ordinary enamel paint against corrosion and oil/heat reactions.

The insulation material, like pre-compressed boards, blocks, corrugated cylinders, Bakelite tubes, insulting tapes, empire sleeves, glass sleeves, varnish, epoxy bushing, porcelain bushing, etc are used of the best quality to ensure the long life of transformers. Oil is used as a coolant and the insulating medium is of the best quality confirming IS:335. Before filling into the transformers, oil is centrifuged, dehydrated, and filtered through the Stream line filtration plant and tested to ensure free from moisture.

TERMINAL ARRANGEMENT

VECTOR GTOUP

HV- Bare Bushing or Cable Box, LV Bare Bushing or Cable Box. Disconnecting chambers can also provided on both HV and Cable boxes.

Dyn11, Various vector groups can be provided as per requirement.

TEMPERATURE RISE

OVERLOADING

Designed for maximum temperature rise at full rated load 40°C/ 50°C for oil and winding of aluminum wound transformers and 45°C/50°C for oil and winding of copper wound transformers

MAESTRO Transformers are designed for overloading more than normal rating as per IS:6600