Traction Transformer Quiz
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Questions and Answers

What is the nominal rating of the traction transformer?

  • 1500 kVA
  • 500 kVA
  • 1000 kVA
  • 1250 kVA (correct)

    • What is the secondary voltage supplied by each secondary winding of the transformer?

  • 1000 V
  • 855 V (correct)
  • 500 V
  • 220 V

    • How much total oil does the transformer contain?

  • 500 litres
  • 600 litres
  • 800 litres
  • 530 litres (correct)

    • What is the transformation ratio of the traction transformer?

    <p>26.32:1</p> Signup and view all the answers

    What is the primary side nominal voltage of the traction transformer?

    <p>22.5 kV</p> Signup and view all the answers

    What type of cooling is employed for the transformer?

    <p>Mineral oil cooled</p> Signup and view all the answers

    How many secondary windings does the traction transformer have?

    <p>2</p> Signup and view all the answers

    What is the main purpose of the stainless plates around the bellows?

    <p>To protect against object projection</p> Signup and view all the answers

    How is the thermometer sensor configured for easy maintenance?

    <p>It can be replaced without removing the oil</p> Signup and view all the answers

    What pressure does the pressure relief valve activate?

    <p>0.8 bar</p> Signup and view all the answers

    What does the oil level indicator in the expansion tank provide?

    <p>Height of the oil level</p> Signup and view all the answers

    What temperature corresponds to the minimum mark on the oil level indicator?

    <p>-20°C</p> Signup and view all the answers

    What color indicates that silicagel is completely dry when it contains cobalt?

    <p>Blue</p> Signup and view all the answers

    At what temperature should silicagel be heated to regenerate it?

    <p>120-150°C</p> Signup and view all the answers

    What should be done when more than half of the silicagel turns pink or colorless?

    <p>It must be changed or regenerated.</p> Signup and view all the answers

    What is the primary purpose of the cooling system mentioned?

    <p>To dissipate electrical losses from the transformer.</p> Signup and view all the answers

    What must be ensured before connecting the HV plug?

    <p>No air is included in the connection.</p> Signup and view all the answers

    What is the core material of the main insulation for the HV bushing?

    <p>Solid insulation</p> Signup and view all the answers

    What is indicated by the position of the locking plate on the butterfly valves?

    <p>Valve position (open or closed)</p> Signup and view all the answers

    Which component aids in field control for the HV bushing?

    <p>Condenser layers</p> Signup and view all the answers

    Which tool is needed to operate the butterfly valve?

    <p>19mm wrench</p> Signup and view all the answers

    What color signals that the silicagel without cobalt is completely saturated?

    <p>Colorless</p> Signup and view all the answers

    What type of supply drives the pump-set?

    <p>3 Phase, 50 Hz, 415 V AC supply</p> Signup and view all the answers

    What is the total weight of the pump?

    <p>39 Kgs</p> Signup and view all the answers

    What is the discharge capacity of the pump in Liters per Minute?

    <p>700 LPM</p> Signup and view all the answers

    What is the primary function of the two air driers in the transformer?

    <p>To dry air in both the oil expansion tank and bushing box</p> Signup and view all the answers

    What material are the upper and lower parts of the air drier made from?

    <p>Aluminum alloy</p> Signup and view all the answers

    What item does the closing system in the lower part of the air drier prevent?

    <p>Contact between air and salts</p> Signup and view all the answers

    What is the class of insulation for the pump?

    <p>Class H</p> Signup and view all the answers

    What is the diameter of the suction and delivery flanges of the pump?

    <p>80 x 80 mm</p> Signup and view all the answers

    What component indicates the need for replacement in the silica-gel air driers?

    <p>Visual color change with a cobalt indicator</p> Signup and view all the answers

    What type of gasket is used in the ball valve described?

    <p>PTFE gasket</p> Signup and view all the answers

    What is the diameter of the cadenas used to lock the valve?

    <p>6 mm</p> Signup and view all the answers

    How many screws are used to fix the ball valve to the tank?

    <p>4 screws</p> Signup and view all the answers

    What type of conductor preparation risks are eliminated by the ADO terminal block?

    <p>Preparation risks</p> Signup and view all the answers

    What feature of the rubber dampers helps to protect the transformer from vibrations?

    <p>Limit vibration transmission</p> Signup and view all the answers

    What is the purpose of the bellow made from ductile metallic materials?

    <p>To allow misalignment and thermal expansion</p> Signup and view all the answers

    What is the primary function of the IP67 connection box?

    <p>To ensure electrical safety and reliability</p> Signup and view all the answers

    What aspect of the ABB terminal blocks contributes to their reliability?

    <p>No retightening required</p> Signup and view all the answers

    What feature does the bellow facilitate in piping systems?

    <p>Misalignment correction</p> Signup and view all the answers

    What is the purpose of the 1"1/4 plug in the ball valve system?

    <p>To close the exit</p> Signup and view all the answers

    What is the rated current for each secondary winding of the traction transformer?

    <p>731 A</p> Signup and view all the answers

    What is the maximum line voltage the traction transformer can handle for short durations?

    <p>30 kV</p> Signup and view all the answers

    What type of cooling method is employed in the traction transformer?

    <p>ODA-F Mineral Oil Cooled</p> Signup and view all the answers

    Which of the following best describes the conductor material used in both windings of the transformer?

    <p>Copper</p> Signup and view all the answers

    What is the primary purpose of the transformer oil pump?

    <p>Circulate oil through the system</p> Signup and view all the answers

    What is the cooling surface area of the transformer specified in the technical data?

    <p>4.37 m²</p> Signup and view all the answers

    Which of the following factors influences the efficiency of the traction transformer?

    <p>Magnetization current</p> Signup and view all the answers

    Which gas has the highest maximum allowable limit value in ppm among the listed gases?

    <p>CO2</p> Signup and view all the answers

    What is the oil volume used in the cooling circuit of the transformer?

    <p>20 litres</p> Signup and view all the answers

    What is the temperature of the oil inlet in the cooling system?

    <p>85° C</p> Signup and view all the answers

    Which gas listed has the lowest maximum allowable limit value in ppm?

    <p>C2H2 (Acetylene)</p> Signup and view all the answers

    Which type of heat exchanger is mentioned in the cooling circuit?

    <p>Aluminium Plate Exchanger</p> Signup and view all the answers

    What is the main function of the closing system in the lower part of the air drier?

    <p>To enable air passage only during thermal expansions</p> Signup and view all the answers

    What kind of air drying material is used in the silica-gel air driers?

    <p>Silicon salts</p> Signup and view all the answers

    Which specification does NOT pertain to the pump?

    <p>Air passage direction control</p> Signup and view all the answers

    Which of the following best describes the material used for the air drier components?

    <p>Aluminium alloy and stainless steel</p> Signup and view all the answers

    What is the total weight of the pump mentioned?

    <p>39 Kgs</p> Signup and view all the answers

    At what voltage does the pump-set operate?

    <p>415 V</p> Signup and view all the answers

    How many air driers are equipped in the transformer?

    <p>Two</p> Signup and view all the answers

    What happens when the oil level becomes too low?

    <p>The oil level detector switches and transformer must be de-energized.</p> Signup and view all the answers

    Which of the following describes the typical density of new oil at 20° C?

    <p>0.876 kg/dm3</p> Signup and view all the answers

    What is the maximum allowable total acidity for new oil?

    <p>0.3 mg KOH/g</p> Signup and view all the answers

    Which of these new oil characteristics reflects the requested value for the flash point?

    <p>250° C</p> Signup and view all the answers

    What is the maximum kinematic viscosity of new oil at 40° C?

    <p>35 mm2/s</p> Signup and view all the answers

    How is the motion of the paddle in the oil flow sensor activated?

    <p>By the flow volume of oil.</p> Signup and view all the answers

    What is the maximum water content allowed in new oil?

    <p>200 mg/kg</p> Signup and view all the answers

    What is the minimum breakdown voltage for new oil?

    <p>45 kV</p> Signup and view all the answers

    Which value indicates the maximum allowable dissipation factor at 90° C and 50 Hz for new oil?

    <p>0.03</p> Signup and view all the answers

    What is the typical value for the neutralization value of new oil?

    <p>&lt; 0.01 mg KOH/g</p> Signup and view all the answers

    What property of ABB rubber dampers is aimed at reducing transmission of shock to the transformer?

    <p>Vibration resistance</p> Signup and view all the answers

    Which of the following statements about the ball valve is incorrect?

    <p>It is held in place by four M6 screws.</p> Signup and view all the answers

    What is a main advantage of the ADO terminal block?

    <p>Eliminates conductor preparation risks</p> Signup and view all the answers

    What is the material composition of the bellow mentioned in the maintenance manual?

    <p>Ductile metallic materials</p> Signup and view all the answers

    What is the purpose of the rubber dampers in the transformer suspension arrangement?

    <p>To limit vibrations and absorb shocks</p> Signup and view all the answers

    Which feature is NOT associated with the IP67 connection box?

    <p>Vibration resistance</p> Signup and view all the answers

    What is a key benefit of using the IP68 cable gland in the connection box?

    <p>Water resistant sealing</p> Signup and view all the answers

    What does the term 'misalignment' in the context of the bellow refer to?

    <p>Misalignment of pipes due to thermal changes</p> Signup and view all the answers

    What mechanism ensures the closed position of the ball valve's operating arm?

    <p>Fixed attachment to the tank</p> Signup and view all the answers

    Which aspect of the connection box contributes to safety and reliability?

    <p>Use of ADO terminal blocks</p> Signup and view all the answers

    Study Notes

    Traction Transformer

    • Rated for 1250 kVA
    • Consists of a primary winding and two secondary windings
    • Each secondary winding has 625 kVA capacity
    • Secondary side nominal current is 731 A at 855 V (secondary voltage)
    • Cooled with 530 liters of oil

    Technical Data

    • Manufacturer: ABB Secheron SA
    • Type: LOT1250, Oil Immersed transformer
    • Identification No: XCH000000-AUC
    • Nominal Line Voltage: 25 kV (19 to 27.5 kV)
    • Line Voltage (min): 16.5 kV
    • Line Voltage (max): 30 kV
    • Frequency: 50 Hz (46 to 54 Hz)
    • Installation Point: Under slung
    • Dimensions (L x W x H): Approximately 2800 x 2000 x 850 mm
    • Total Weight (incl. oil): Approx. 3.3 tonnes
    • Cooling: ODAF- mineral oil cooled

    Primary Side Technical Data

    • Rated Power: 1250 kVA
    • Nominal Primary Voltage: 22.5 kV
    • Rated Current Voltage: 58 A at 22.5 kV

    Traction Winding Technical Data

    • Number: 2
    • Rated Power: 625 kVA
    • Secondary Voltage: 855 V
    • Standard Current per Winding: 731 A at 855 V (prim. 22.5 kV)
    • Leakage Inductance: 1.465 mH ± 10% (relative to secondary)
    • Transformation Ratio: 26.32:1
    • Resistance: ≤ 50 mΩ (relative to secondary side)
    • Magnetization Current: 0.17 A ±30% (under 22.5 kV)
    • Efficiency: 96%
    • Cooling Surface Area: 4.37 m²
    • Turns ratio: 26.294
    • Total Oil Volume (20°C): 560 dm³

    Winding Details (HV and Traction)

    • HV Winding: 1
    • Traction Winding: 2
    • Conductor Material (both): Copper
    • Total X-Section (HV): 8.74 mm²
    • Rated Current (HV, at 22.5 kV): 55.55 A
    • Current Density (HV): 6.4 A/ mm²
    • Number of Layers (HV): 18
    • Winding Resistance (HV, at 85°C): 9.135 Ω
    • Number of Turns (HV): 2682
    • Total X-Section (Traction): 128.35 mm²
    • Rated current at 22.5 kV (Traction): 731 A
    • Current Density (Traction): 5.69 A/ mm²
    • Number of Layers (Traction): 6
    • Winding Resistance (Traction at 85°C): 15.4 mΩ
    • Number of turns (Traction): 102

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    Description

    Test your knowledge on traction transformers with this quiz. Explore key concepts including voltage ratings, oil capacity, cooling methods, and maintenance configurations. Perfect for engineering students and professionals in the electrical field.

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