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INDUCTIVE VOLTAGE TRANSFORMER

DESCRIPTION


Production:EMEK voltage transformers are manufactured in Ankara Turkey.

Special Design: Non standard core data, creepage, seismic, etc. designs are available on request.

Standards: All transformers are subjected to full routine tests as described in relevant standards. Type tests can also be performed in our own testing laboratories but should be negotiated during the order stage.

Quality Assurance: Emek is ISO 9001 certified by both ABS Quality Evaluations Inc. and TSE, Turkish Standards Institute.

CHARACTERISTICS

General Description:

  • Primary and secondary windings are housed in a porcelain bushing.
  • Including and above 245 kV EMEK VTs are two piece designs, commonly known as "Cascade". These are basically two independent VTs connected in series. They are named as top unit and bottom unit.
  • Transformers are hermetically sealed.

Frequency: 50 Hz, 60 Hz.

Rated Secondary Voltage: 110/√3,100/√3 V etc. in conformity with customer requirement.

Rated Tertiary Voltage: 110/√3, 100/√3, 110/3,  100/3,100,110 V etc. in conformity with customer requirement.

Highest System Voltage: Highest system voltage from 36 to 420 kV.

Number of Secondary Windings: In conformity with customer requirements. Maximum  4 secondary windings.

Voltage factor : 1.2 x Un continuous /1.5 x Un for 30 sec. or 1.9x un 8 hrs.

Standards: IEC, BS, ANSI, AS, other standards on request

Hermetic Seal:
Oil volume variations are compensated with stainless steel bellows placed in the head of the Inductive Voltage transformers. With this facility there will be no contact between air and oil. The dielectric strength will remain unchanged for the life time of the VT.

Primary Terminals: Primary terminals are made from tin plated brass. Vertical and horizontal primary terminals are available. Dimensions of stud type are 30 x 80 mm. Nema pad or clamp type primary terminals are available on request

Core: High quality sheet steel cores are used.


Paper Insulation: Oil impregnated paper, high dielectric strength, low dielectric losses.

Bushing:Brown glazed porcelain (other colours on request).
Extra high creepage distance is also possible on request.

Oil Insulation: The insulating oil is mineral oil in conformity with IEC 296. Before impregnation, moisture and gases are removed from the oil by special processes. Drain plug for taking samples and oil refilling facilities are provided on request Floating type oil level indicator is standard supply.

Oil Impregnation: Heat and vacuum are applied to the fully insulated windings after assembly of the magnetic unit for drying purposes, followed immediately by oil impregnation procedure.

Accessories: Fixing holes, lifting holes, secondary terminal box, name plate, warning plates are also provided in our standard design.

Secondary Terminal Box:

  • Hinged type boxes are used and are sealable on request.
  • Secondary terminals are clamp type, other types are also available on request.
  • Fuses or MCB's are also available on request.

Name Plate: Name plates are stainless steel and weatherproof.

Primary Windings: Enamelled electrolytic copper wire is used for primary windings of voltage transformer.

Secondary Windings: Enamelled electrolytic copper wire is used for secondary windings of voltage transformer.

External Binding Elements: All external bolts, nuts, washers etc. are either stainless steel or hot dip galvanized steel.

Painting: External surface of the transformers, which are already corrosion protected (e.g. by galvanizing), are additionally painted grey colour. Other colours are available on request.

Earthquake Design: Standard design is up to 0.6g.

Mechanical Strength: Applied load to the primary terminal in horizontal and vertical is in conformity with IEC 60044.2.

Ambient Temperature: Standard design is suitable for temperature range -25 °C to + 40 °C. Other ranges on request.

Altitude: Standard design is suitable up to 1000 m above sea level. Higher values on request.

Bracelet: All bracelets used on transformers are made from aluminium alloy.

Optional Accessories:

  • Steel support structure
  • Primary connectors
  • Marshalling box

Storage: It is recommended to store the transformers in their factory packed condition prior to installation.

Packing: The transformers are packed in rugged wooden crates which are suitable for transportation. The transformers are encapsulated in polyethylene covers to keep them from environmental effects such as rain-fall, dust and sand etc. (during transport and storage). Wooden crates can be lifted by either a fork lift or by a crane with slings.

Spare Part: There are no user serviceable parts, therefore no spare parts are required.

Maintenance:

  • Maintenance free, simple recommendations :
  • A complete and thorough inspection should be carried out in every year
  • Clean the porcelain bushing at regular intervals depending on the degree of pollution.
  • Ensure that there is no oil leakage.
  • Periodical measurement of capacitance and power factor are recommended.

Special Tools: No special tools are required for the maintenance.

Assembly:

  • Before assembly, the following visual checks should be made.
  • There are no oil leaks
  • The porcelain is not damaged
  • There is no damage on the primary terminals
  • The oil level indicator indicates sufficient oil level
  • Lifting holes are provided on the base plate. These should be used for lifting and assembly.

   
REQUIRED TO MAKE AN OFFER

General         
                                           

  • Quantity
  • Delivery Time
  • Destination
  • Service Conditions
  • Others

Electrical Data

  • Insulation Level
  • Frequency
  • Number of Windings
  • Voltage Ratio
  • Rated Burden for Each Winding
  • Accuracy Class for Each Winding
  • Voltage Rating Factor
  • Creepage Distance
  • Standard




 
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