Technical Data on VACUTAP® Tap-Changer
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Questions and Answers

What do Gas-to-liquid oils (GTL oils) represent in this context?

  • Synthetic oils
  • Petroleum products (correct)
  • Renewable energy sources
  • Natural gas derivatives

    • What should be verified when selecting an on-load tap-changer?

  • The environmental impact of usage
  • The maximum operational efficiency
  • The initial installation costs
  • The highest voltage stresses do not exceed rated withstand voltages (correct)

    • In the context of insulation distances, which configuration indicates more stress?

  • With coarse change-over selector in position -
  • With reversing change-over selector
  • With coarse change-over selector in position + (correct)
  • Without change-over selector

    • What is necessary to consider regarding permitted voltage stresses on the on-load tap-changer?

    <p>The insulation distances</p> Signup and view all the answers

    What aspect is related to the 'rated step voltage Uir' mentioned in capacity diagrams?

    <p>The voltage ratings for equipment operation</p> Signup and view all the answers

    What does the step capacity diagram illustrate for VACUTAP® VM and VM 300?

    <p>The rated step voltage and current ratings</p> Signup and view all the answers

    Which of the following is NOT a condition described for voltage stresses?

    <p>Highest stresses exceed rated withstand voltages</p> Signup and view all the answers

    What does the term 'permitted voltage stresses' specifically refer to?

    <p>The maximum voltages that insulation can handle</p> Signup and view all the answers

    What is the main subject of the document?

    <p>On-load tap-changer specifications and designations</p> Signup and view all the answers

    Which language were the original operating instructions written in?

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

    What is indicated by the statement 'all rights reserved' in the document?

    <p>Reproduction and dissemination require explicit permission</p> Signup and view all the answers

    What does the term 'on-load tap-changer' refer to in this context?

    <p>A component used to adjust voltage in transformers</p> Signup and view all the answers

    What right is reserved in the event of granting patents or utility models?

    <p>Changes to the design and scope of supply</p> Signup and view all the answers

    What is the customer's responsibility when using the specified product?

    <p>To ensure compatibility with their scope of application</p> Signup and view all the answers

    What aspect of the document indicates its intended exclusivity?

    <p>The clear mention of legal rights and permissions</p> Signup and view all the answers

    What might be a consequence of unauthorized reproduction of the document?

    <p>Legal liability and potential compensation claims</p> Signup and view all the answers

    What is the maximum number of operating positions for the VACUTAP® VM without a change-over selector?

    <p>18</p> Signup and view all the answers

    Which selector size is not applicable with the VACUTAP® VM?

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

    What is the maximum temperature of the insulating fluid during normal operation of VACUTAP® VM?

    <p>+105 °C</p> Signup and view all the answers

    What is the transport temperature range for the VACUTAP® products?

    <p>-40 °C…+50 °C</p> Signup and view all the answers

    What is the compressive strength of the on-load tap-changer oil compartment?

    <p>0.3 bar</p> Signup and view all the answers

    How many equipped sectors does the VACUTAP® VMS® have?

    <p>3</p> Signup and view all the answers

    What is the maximum number of operating positions for the VACUTAP® VM with a change-over selector?

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

    Which dimension is mentioned in the mechanical data for the VACUTAP® products?

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

    When the transformer is in emergency operation, what is the maximum permitted temperature for the insulating fluid?

    <p>+115 °C</p> Signup and view all the answers

    Which VACUTAP® model has a selector size B and a maximum of 27 operating positions with a change-over selector?

    <p>VACUTAP® VM 300</p> Signup and view all the answers

    What is the maximum operating voltage for the VACUTAP® VMS®?

    <p>170 kV</p> Signup and view all the answers

    Which type of tap-changers are applicable according to the content?

    <p>Single-phase on-load tap-changers</p> Signup and view all the answers

    For selector size C, what is the rated insulation level for AC?

    <p>82</p> Signup and view all the answers

    What does the 'LI' stand for in the insulation distance table?

    <p>Lightning Impulse</p> Signup and view all the answers

    Which insulation type shows the highest value for selector size D?

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

    What is the admissible maximum operating voltage for insulation distance 'a0' for size B?

    <p>150</p> Signup and view all the answers

    How many times is the voltage for insulation distances 'a' compared to the values listed for AC?

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

    What is the value for the varistor response voltage at a lightning impulse?

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

    For selector size DE, what is the insulation distance value for LI?

    <p>550</p> Signup and view all the answers

    In the insulation distance table, which size has the lowest rating for SI?

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

    Which connection type corresponds to the designation 10050?

    <p>Connection without change-over selector</p> Signup and view all the answers

    What is the unique factor for connections marked with 'W' in their designation?

    <p>They belong to reversing change-over selectors.</p> Signup and view all the answers

    Which of the following designations corresponds to a connection with a coarse change-over selector?

    <p>12101G</p> Signup and view all the answers

    How many unique connections are there for the changing over selector labeled 12111G?

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

    What is indicated by the presence of the 'G' designation in the context of VACUTAP connections?

    <p>It references connections with change-over selectors that have multiple mid-positions.</p> Signup and view all the answers

    What common feature do all connections identified under designation 10100 share?

    <p>They exist in the reversing change-over selector category.</p> Signup and view all the answers

    Which of the following options includes a connection that has more than three mid-positions?

    <p>12101G</p> Signup and view all the answers

    Which connection type is associated with the designation 14271W?

    <p>Connection with reversing change-over selector</p> Signup and view all the answers

    The original operating instructions for the product were written in French.

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

    The customer has no responsibility to ensure compatibility with their planned scope of application.

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

    The document allows for the reproduction and dissemination of its content with prior permission.

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

    The technical specifications of the product are based entirely on the manufacturer's information.

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

    The maximum number of operating positions for the VACUTAP® VM is greater than 30.

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

    The document reserves all rights in the event of damage claims related to the use of its content.

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

    The technical data presented in the document is final and will not change after publication.

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

    The designation system for on-load tap-changers includes numbers like 746224 and 10116560.

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

    The insulation distance f for a rated insulation level of 72.5 kV is 140 kV.

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

    The LI value for the rated insulation level of 245 kV is 1 150 kV.

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

    Insulation distance c2 is defined as the distance between change-over selector contacts of the same phase.

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

    For the insulation distance a, the maximum specified withstand voltage is important when exposed to impulse voltage.

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

    The AC value for the rated insulation level of 300 kV is 460 kV.

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

    The insulation distance b encompasses the contacts of different phases connected with the beginning and end of a tap winding.

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

    The SI value for the insulation level of 170 kV is 850 kV.

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

    The insulation distance a1 relates to tap selector contacts for different tap positions, regardless of connection.

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

    Gas-to-liquid oils (GTL oils) are classified as renewable energy sources.

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

    The rated step voltage Uir is related to both rated current and the type of tap-changer used.

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

    Permitted voltage stresses should exceed the rated withstand voltages for safety.

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

    Insulation distances vary significantly depending on whether a change-over selector is present.

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

    The maximum stress allowed under lightning impulse conditions is set at a specific insulation distance.

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

    A coarse change-over selector can only be positioned in the '+' position for optimal performance.

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

    The electrical arc furnace operation diagrams are unaffected by the load current specifications.

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

    The rated lightning impulse withstand voltage is a critical factor for electrical equipment insulation.

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

    Bridges on the selector connection contacts are optional for on-load tap-changers VACUTAP® VM I 802/1002.

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

    The connections listed under designation 12111W correspond to a change-over selector type that is not coarse.

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

    For current division, bridges are required only on the contacts of a single selector plane.

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

    The selector size with a maximum of 27 operating positions without a change-over selector is indicated by the designation 14140.

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

    The connections with designations ending in 'G' are associated exclusively with reversing change-over selectors.

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

    The insulation distance 'f' refers to the distance between the diverter switch output terminal and the ground.

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

    For selector size B, the insulation distance 'a0' has a maximum value of 20.

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

    The rated insulation level for AC for selector size C is 120.

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

    The minimum varistor response voltage at 1.2/50 µs lightning impulse is recorded as 45 kV.

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

    For insulation distance 'c2', the value relates to different phases that are unconnected.

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

    The selector sizes B and C have identical values for insulation distance 'd1'.

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

    Between connected and adjacent coarse tap contacts in one phase, the insulation distance is referred to as 'd2'.

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

    The insulation distance 'b' measures between the tap selector contacts of the same phase.

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

    The insulation distance 'c1' is greater than or equal to 400 for selector size C.

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

    The residual voltage at 3 kA peak withstand current for varistor response is listed as 66 kV.

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

    Study Notes

    On-load Tap-Changer Overview

    • VACUTAP® VM®, VM 300, VMS® are on-load tap-changers used in transformers.
    • Designed for various applications, they allow adjustment of transformer output voltage without interrupting service.

    Mechanical Data for VACUTAP Models

    • VACUTAP® VM
      • Maximum operating positions: 18 (without change-over selector), 35 (with change-over selector), 107 (with multiple coarse change-over selector).
      • Equipped sectors: 1 to 3.
    • VACUTAP® VM 300
      • Maximum operating positions: 14 (without change-over selector), 27 (with change-over selector).
    • VACUTAP® VMS®
      • Maximum operating positions: 18 (without change-over selector), 35 (with change-over selector).
      • Equipped sectors: 3.

    Ambient Conditions

    • Operational air temperature: -25 °C to +50 °C.
    • Insulating fluid temperature during operation: -25 °C to +105 °C (up to +115 °C in emergencies).
    • Transport and storage temperature: -40 °C to +50 °C.
    • Oil compartment is pressure-resistant to 0.3 bar (continuous differential pressure).

    Step Capacity Diagrams

    • Step capacities are defined for network applications and electrical arc furnace operation for VACUTAP models.
    • Important for understanding rated step voltage (Uir) and current (Ir) capabilities.

    Permitted Voltage Stresses

    • Voltage stresses must respect rated withstand voltages based on insulation distances.
    • Admissible operating voltage is defined as half the values for applied voltage (AC).

    Insulation Levels and Selector Sizes

    • Rated insulation levels vary between models and include distinct performance metrics for insulation distance based on selector size (B, C, D, DE).
    • Admissible voltages are specified under various configurations, ensuring compatibility with system requirements.

    Connections for VACUTAP® VMS® III and VM 300

    • Realizable connections for VACUTAP® VM 300 and VMS® III may involve varying configurations, accommodating change-over selectors and coarse tap options.

    General Notes

    • Specifications are subject to change; technical data might differ from the initial document due to product alterations post-publication.
    • Customers must ensure product compatibility with their specific applications.

    Introduction to VACUTAP® Tap-Changers

    • VACUTAP® is a range of on-load tap-changers designed for various applications, including network and electrical arc furnace operations.
    • Key designs include VACUTAP® VM, VM 300, and VMS®.

    Technical Specifications

    • Document emphasizes strict protection of its content and intellectual property rights, including potential liabilities for infringement.
    • Ensure compatibility of the on-load tap-changer with specific customer applications.

    Insulation and Voltage Stresses

    • Insulation distances are critical to ensure the rated withstand voltages aren’t exceeded during operations.
    • Different types of insulation levels are specified for various components of the tap-changer including diverter switches and selectors.

    Step Capacity Diagrams

    • Diagrams outline the rated step voltage (Uir) and rated through-current (Ir) for network applications and arc furnace operations.
    • Detailed representations are crucial for assessing performance under different loads.

    Permissible Ambient Conditions

    • Specific ambient conditions must be maintained to ensure optimal functioning of the on-load tap-changer.

    Rated Insulation Levels

    • Ratings include:
      • Lightning impulse (LI), Chopped wave lightning impulse (LIC), Switching impulse (SI), and Applied voltage (AC).
    • Each rated insulation level has its specified insulation distance, critical for ensuring safety and performance.

    Realizable Connections

    • Detailed connections for VACUTAP® VMS® III are outlined for various configurations.
    • Specific requirements must be adhered to depending on the type of change-over selectors used.

    Special Designs

    • Bridges may be required for the parallel connection of selector planes to ensure current distribution in multi-branch tap windings.

    Conclusion

    • VACUTAP® tap-changers are engineered for reliability and performance under specified operating conditions, with careful attention to insulation ratings and connection configurations.

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    Description

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