Transformers

Furnace Transformer - ARC

Transformers of this type are used in the steel melting and metallurgical industry. They are characterised by high secondary current(for steel up to 90 kA and for ferroalloy upto 160 kA electrode current) and a wide secondary voltage range. The secondary voltage is normally regulated by an on - load tap changer (OLTC) located in the high voltage winding or in an intermediate circuit of a two-cored design within the transformer tank.

Product Features

• Suitable for large voltage variation on LV side
• LV Voltage variation is ON-Load Type
• Requires 2 Nos. Interconnected Transformer
• Weight is nearly 2 times that of normal Transformer
• Designed to withstand the harmonics generated due to furnace operarion

Specifications

Rating	:	Upto 12MVA
Primary Voltage	:	33kV
Secondary Voltage	:	As per requirement
No. Of Phase	:	One / Three
Cooling	:	ONAN / ONAF / AFWF
Applicable Standard	:	IS, IEC, IEEE, ANSI, JIS etc
Winding Material	:	Copper
Insulation Class	:	A
Constructional Features	:	Conventional Tank Mounted, Cover / Lead Mounted Type

"Off Circuit Manually Operated" and "On Load Tap Changer"(OLTC) with AVR and RTCC panel

Application

• Steel Industry
• Automobile Industry
• Metal Industry
• Electrolysis processes for the production of metals, such as aluminum, magnesium, copper and zinc, or Chemicals etc.
• Ferro - alloy furnaces and similar with short or submerged arc

Product Features

• This connection is a solution for the conversion of three phase primary to a two phase secondary. On the two phase side the windings may be connected to give three or four wires.
• 3-Phase to 2-Phase Conversion
• Automatic control with 2-Phase OLTC
• Off Circuit Taps on LV and HV
• Option available in Hermetically Sealed and Conventional Type

Specifications

Rating	:	Upto 5,000kVA
Primary Voltage	:	Upto 33kV
Frequency	:	50 / 60 Hz or as per requirement
Vector Group	:	Scott-T
Cooling	:	ONAN
Applicable Standard	:	IS, IEC, IEEE, ANSI, JIS etc
Winding Material	:	Copper / Aluminium
Insulation Class	:	A
Constructional Features	:	Conventional Tank Mounted, Cover Mounted Type, Hermetically Sealed Tank

Application

• A scott-T transformer is used to convert 3 phase AC to 2 Phase or vice versa
• Applications of this are voltage regulators or cost reduction for short distance 3 phase transmission
• Using it for a voltage regulator you could run the 2 phase output through an inductor or capcitor and resistor branch to get a single phase indicative of all three phases of a generator.

Raychem RPG's Oil Immersed Power Transformers are manufactured in accordance with the most demanding industry and international standards. Transformers can be provided with off-load and on-load tap changers.

Product Features

• Low loss CRGO Silicon Steel for core
• Oil Filling through Oil Impregnation procedure(Adopted generally for EHV Transformer). It leads to enhanced life.
• Minerals oil or silicon oil or as per requirement
• Electrolytic Grade Copper Winding
• Step lap construction and mitred joint for core
• Designed for extreme system supply and ambient temperature
• Losses as per star rating,(if required) as per BEE
• Low Power Loss and Low Noise Loss

Specifications

Rating	:	Upto 25MVA
Primary Voltage	:	Upto 132kV
Secondary Voltage	:	As per requirement
No. of Phase	:	Three
Cooling	:	ONAN / ONAF / AFWF
Applicable Standard	:	IS, IEC, IEEE, ANSI, JIS etc
Winding Material	:	Copper
Insulation Class	:	A
Constructional Features	:	Conventional Tank Mounted, Cover Mounted Type

In hermetically sealed transformer, pressure variation due to oil expansion & contraction is absorbed by the flexible corrugated steel tank(variable volume tank design), where by the maximum operating pressure remains at only a fraction of the usual. Transformers are always shipped completely filled with oil and sealed for their lifetime. Bushings can be exchanged from the outside draining the oil below the top of the active part.

The cover is equipped with a filling pipe which is high enough to ensure a safe oil filling level in the insulating elements at all times for the bushing.

Hermetically sealed Transformers are used in high humid environment, where there is limitation of maintenance services and there is a confined space condition such as package or compact substation units.

Dry type Cast Resin Transformers are designed & tested to comply with National & International Standards IS / BIS / ANSI / IEC & IEEE.

Casting based on semi-filled system(with automatic filer loading)

• Excellent Heat Transfer
• Identical Thermal Coefficients
• Probably the first dust free facility in India

Product Features

• High impluse & dynamic short circuit strength
• Good overload capacity
• Low partial discharges
• Lower losses
• Non - Hygroscopic
• No fire hazards
• Transformers are non-flammable and self - extinguishing, Fire resistant and safe
• Reduced environmental contamination due to Zero risk of leakage of flammable or contaminating substances
• Well suited for damp and / or contaminated areas
• High performance towards dealing with seismic phenomena Capable of withstanding the most severe of rolling and vibrating conditions

Specifications

Rating	:	Upto 10 MVA
Voltage Class	:	Upto 33kV
Frequency	:	50 / 60 Hz or as per requirement
Vector Group	:	Dyn11 / YNd11 / Dyn1
Cooling	:	ANAN / ANAF
Applicable Standard	:	IS, IEC, IEEE, ANSI, JIS etc
Winding Material	:	Copper / Aluminium
Insulation Class	:	F / H / C