Special Application Transformer

There are complete range of distribution transformers from single phase, oil filled or dry, pole-mounted units through all standard units to meet all power requirements. But some times situations arise in which even the wide strange of transformers currently available cannot meet the customer´s needs. In those cases we design and build customized transformers to full fil the customer´s requirements in every respect.

PAD MOUNTED TRANSFORMER

Pad mounted transformers feature a tamper resistant construction with no externally accessible bolts, hinges, screws or fasteners, thus providing a safe, self-contained unit which cannot be accessed by unauthorized personnel. Unsightly fences or other forms of protective devices are not necessary. Completely factory assembled, the units are shipped in one piece. These units feature a rectangular core and coil design which is a distinguishing characteristic of oil type transformers .This proven design offers reliability, durability and reduced dimensions. Nearly 40 years of service and scrupulous testing confirm the consistency of the design

STANDARD FEATURE

• Tamper resistant
• Copper or aluminum windings
• Special core and coil design
• 65°C average temperature rise
• Tap changer for deactivated operation
• Four full capacity taps on winding rated 2.5%2- FCAN-2-FCB Non units with voltage above 601V
• Liquid preservation system with sealed tank
• Tank rated 5 psig for oil-filled units
• Tank rated 8 psig for silicone filled units
• Lifting lugs for moving complete units
• Pressure relief valve
• Two copper-faced steel ground pads on tank
• Weather resistant cabinet bolted to the front of the transformer
• HV/LV compartment barrier bolted in place
• Three-point terminal compartment laching
• HV compartment located on left side of unit:
  • (a) Live front-cast resin bushings or universal bushing wells for dead front
  • (b) Provision for distribution-class LAs
  • (c) Space for stress cones
  • (d) Inter locked door which can be opened only after opening LV compartment door
• LV compartment located on right side
  • (a) Compartment door with provision for pad-lock
  • (b) Ground pad
  • (c) Provision for dial-type thermo meter
  • (d) Provision for vacuum-pressure gauge
  • (e) Liquid level gauge
  • (f) Diagrammatic stain less steel rating plate
• Different paint finishes available
• Base designed for rolling the unit in accordance with ANSI-IEC-DIN segment centerlines

TRANSFORMER FOR VARIABLE SPEED

With the increasing use and complexity of variable speed drives for different applications, selecting the correct converter transformer has become of vital importance. Choosing the correct converter transformers for different converters and drive systems means reduced down time, extended equipment life reduced harmonic distortion and last, but not least, energy saving.

RECTOR

Single phase and /or three-phase reactors are characterized by a wide range of solutions found in several High Voltage and /or Medium Voltage installations for both oil-type and dry purposes.

Zero sequence reactors

Zero sequence reactors are used to limit zero sequence current on motors with galvanically separated windings. The reactors are individually designed and manufactured according to system requirements. There fore no standard types are listed.

Commutation reactors

Direct cyclo converters without supply trans-formers (e.g. propulsion and other drives where space and weight limitations are important) are usually fitted with commutation reactors. The reactors reduce the commutation currents and notches in the system voltage. The commutation reactors are normally dry-type but can also be manufactured as oil immersed.

Two basic designs are used:

• Saturable gapped core reactors
  • (a)No short circuit current limitation is needed
• Non saturable type reactors
  • (b)The reactor also works as a short circuit limiting reactor

The commutation reactors are individually designed and manufactured according to system requirements.

Duplex reactors

Duplex reactors are special commutation reactors used in propulsion drives to achieved is tortion free voltage in the auxiliary circuits. The most efficient harmonic reduction is achieved when the duplex reactors are connected to the generators, one to each generator. In this way the effect on harmonics does not depend on the operation. The duplex reactors are individually designed and manufactured according to system requirements. Single-phase and /or three-phase reactors are characterized by a wide range of solutions found in several high voltage and medium voltage installations for both oil and dry purposes