Liquid Filled Distribution Substation

Mineral Oil Filled
The oil-filled unit is the least expensive transformer, and is suitable for mounting outdoors or indoors enclosed in a vault. The oil used by MGM Transformers meets all the requirements of ANSI C57.106 and ASTM D-3487, has high dielectric strength, is free from impurities, is durable and has a high flash point

Silicone Filled
The silicone fluid selected for use by MGM Transformers is a clear, liquid silicone polymer (polydimethyl-siloxane) that has been specially processed to meet exacting dielectric specifications. To obtain an optimum combination of heat transfer and fire-resistant properties, the transformer silicone fluid has a viscosity of 50 centistokes at 25°C.

Environmentally Friendly Dielectric Liquid FR3
A fire-resistant, vegetable oil based dielectric coolant formulated for use in distribution transformers is available when its unique electrical, thermal and safety properties are advantageous. It is non-toxic and readily biodegradable. It is also referred to as a High Fire Point Fluid, a High Molecular Weight Hydrocarbon or a Less Flammable Dielectric Liquid.

IEEE standards allow 5% maximum harmonic content of load current for standard distribution transformers.

If the distribution load consists of electronic power supplies, electronic ballasts and adjustable speed motor control, it is prudent to investigate the harmonic content and, perhaps, specify a “K Rated” transformer. MGM Transformers can help to determine required “K Factor” from the applicable harmonic current spectrum.

MGM Transformers’ miter cut core is fabricated from high grade grain-oriented silicon steel, hand stacked to give low losses and excitation current, and tightly clamped and braced to mechanically strong coils fabricated from extruded rectangular conductors.

In the larger units, a full width strip conductor is used in the low voltage windings, reducing short circuit stresses and providing improved heat transfer for cooler coil operation. Conditioned strip edges eliminates burns and sharp edges. Only thermally upgraded insulation is used throughout for extended life at 65°C. Units rated 55°/65°C when operated at 65°C have 12% added capacity, with normal life expectancy

MGM Transformers’ tanks are rugged, constructed from precision cut steel and braced to withstand the stresses of shipping, rolling and jacking. They will withstand a +10 psi pressure or -15 psi vacuum without damage, deterioration or leaking. All tank bases are designed to permit rolling in any direction perpendicular to a tank wall. A bolted hand hole is provided in the cover, which is welded on. Leak tests are performed before tanking and pressure tests prior to painting.

Any combination of throat, flange or terminal chamber are available to match the requirement of a variety of high voltage switches and low voltage distribution sections. Custom design termination is also available for matching existing switch gear.