On-Load Tap-Changer Installation Guide
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Questions and Answers

What must be done with the sealing surface of the supporting flange before positioning the bell-type tank?

  • Inspect the sealing surface for damage
  • Apply a lubricant to the sealing surface
  • Clean the sealing surface and place the gasket (correct)
  • Ensure the sealing surface is dry and rough

    • Which of the following tools is required to remove the fixing nuts of the base plate?

  • Socket wrench
  • Wrench 10
  • Pliers
  • Wrench 13 (correct)

    • What should be noted about the o-rings while removing the suction pipe from the on-load tap-changer head?

  • Their condition should be checked for leaks
  • They need to be replaced every time
  • They should be lubricated before removal
  • They must be preserved carefully during removal (correct)

    • During the installation process, what is the initial action required before lifting the diverter switch insert?

    <p>Remove the fixing nuts of the base plate</p> Signup and view all the answers

    How many screws need to be unscrewed from the on-load tap-changer head during the disassembly process?

    <p>17 nuts M8</p> Signup and view all the answers

    What is indicated by the red-marked area on the tap position indicator disc?

    <p>On-load tap-changer head region not covered by the base plate</p> Signup and view all the answers

    What is a critical consideration when lifting off the on-load tap-changer head?

    <p>Ensuring the sealing is intact</p> Signup and view all the answers

    Which component must be carefully lifted and withdrawn from the oil compartment during installation?

    <p>Diverter switch insert</p> Signup and view all the answers

    What is the maximum tightening torque for the nuts securing the on-load tap-changer head?

    <p>14 Nm</p> Signup and view all the answers

    Which component should be mounted after ensuring the O-rings are correctly seated?

    <p>Suction pipe</p> Signup and view all the answers

    How many nuts are required to attach the tap position indicator disc properly?

    <p>5 M8 nuts</p> Signup and view all the answers

    What must be done to the O-rings before installation?

    <p>They need to be slightly greased.</p> Signup and view all the answers

    What is the proper tool size for the screws used to close the on-load tap-changer head?

    <p>Wrench 17</p> Signup and view all the answers

    What role does the coupling pin play in the installation of the tap position indicator dial?

    <p>It ensures the dial is mounted in the correct position.</p> Signup and view all the answers

    Which type of washers should be used for securing the head of the on-load tap-changer?

    <p>Locking washers</p> Signup and view all the answers

    How many screws are used to evenly screw down the on-load tap-changer cover?

    <p>24 screws M10</p> Signup and view all the answers

    What is the purpose of the oil-resistant gasket when mounting the on-load tap-changer head?

    <p>To prevent oil leakage</p> Signup and view all the answers

    What is the required distance to be maintained between the on-load tap-changer head and the supporting flange?

    <p>5-20 mm</p> Signup and view all the answers

    What should be ensured before lifting the on-load tap-changer for installation?

    <p>All supporting flange stud bolts align with fixing holes</p> Signup and view all the answers

    Why must small parts be monitored when disassembling and reassembling the on-load tap-changer?

    <p>To ensure identical quantities and avoid assembly issues</p> Signup and view all the answers

    What is a potential consequence of dropping parts into the diverter switch oil compartment during installation?

    <p>It could block the diverter switch</p> Signup and view all the answers

    What should be done with the sealing surfaces before mounting the on-load tap-changer head?

    <p>They should be cleaned</p> Signup and view all the answers

    What markings should be noted when positioning the on-load tap-changer head?

    <p>Alignment marks on the supporting flange and head</p> Signup and view all the answers

    Which of the following is NOT recommended during the installation process?

    <p>Dropping parts intentionally for better fit</p> Signup and view all the answers

    What must be ensured in the protective housing of the motor-drive unit?

    <p>The electrical heater is functioning correctly</p> Signup and view all the answers

    What procedure should be followed if the protective relay is triggered?

    <p>Remove the diverter switch insert and check it thoroughly</p> Signup and view all the answers

    What is a critical action to take after checking the on-load tap-changer?

    <p>Confirm there is no damage before usage</p> Signup and view all the answers

    Which of the following is NOT required to be oil-proof?

    <p>Protective relay connections</p> Signup and view all the answers

    What is the consequence of energizing the transformer without proper checks?

    <p>Potential damage to the tap-changer and transformer</p> Signup and view all the answers

    Which guideline is referenced for checking the protective relay RS 2001?

    <p>Operating Instructions No. 59</p> Signup and view all the answers

    What is the audible indication of the diverter switch operation?

    <p>It is clearly audible.</p> Signup and view all the answers

    What precaution must be taken regarding the end positions of the change-over selector?

    <p>They must never be overrun.</p> Signup and view all the answers

    What is the recommended minimum drying treatment for the on-load tap-changer?

    <p>Vacuum-drying should be conducted.</p> Signup and view all the answers

    What should be done with the on-load tap-changer cover before vacuum-drying in the autoclave?

    <p>It must be removed and stored outside the autoclave.</p> Signup and view all the answers

    During the heating phase of vacuum-drying, how should the temperature be increased?

    <p>Gradually by approximately 10 °C/h.</p> Signup and view all the answers

    What is the maximum final temperature for heating the on-load tap-changer?

    <p>110 °C</p> Signup and view all the answers

    What action should be minimized concerning tap-change operations without oil?

    <p>The number of operations should be minimized.</p> Signup and view all the answers

    What should be checked after conducting a transformer ratio test?

    <p>The on-load tap-changer position</p> Signup and view all the answers

    The maximum tightening torque for securing lines to oil compartment connection terminals is 90 Nm.

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

    All connections made during the installation process must be carried out carelessly to ensure quick assembly.

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

    Lock nuts M12 require a wrench with a size of 19 to secure the tap selector suspension.

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

    The tap selector suspension must be bolted to the oil compartment base after raising the tap selector to its initial height.

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

    A single locknut and screening cap is adequate for each line attached to the oil compartment connection terminals.

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

    It is essential to ensure the screening of terminal locations using the screening caps supplied with the equipment.

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

    The maximum weight of the tap selector during shipment is approximately 500 kg.

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

    The protective relay RS 2001 weighs approximately 10 kg.

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

    Diverter switch oil compartment is shipped as one single piece.

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

    All on-load tap-changer parts should be removed from their protective wrapping immediately upon arrival.

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

    The drive shaft with coupling parts and bevel gear has a maximum weight of approximately 30 kg.

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

    The total weight of the diverter switch head and fitted diverter switch insert is around 210 kg.

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

    Parts must be stored in a humid place until installation.

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

    The shipment should be checked for completeness based on the shipping documents.

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

    The end positions of the change-over selector can be overrun during operation.

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

    A higher torque is required when operating the change-over selector.

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

    During the vacuum-drying process, the on-load tap-changer cover must remain within the autoclave.

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

    The maximum heating temperature for the on-load tap-changer is set at 110 °C during the drying process.

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

    A minimum number of tap-change operations without oil is recommended.

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

    The kerosene drain screw should be closed when vapor-phase drying the transformer.

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

    Inspecting the connection diagram is unnecessary when checking the attained operating position.

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

    The pre-drying stage involves circulating air at a maximum temperature of 10 °C.

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

    A pipe must be connected to pipe connection S for suction pipe even if no feed pipe is attached.

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

    The E2 connection must always be open for connections to the Buchholz relay.

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

    The serial number of the motor-drive unit must be identical to that of the oil filter unit.

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

    Pipe connection Q is utilized only when there is an oil filter unit connected.

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

    The adjustment position for the motor-drive unit is indicated in the motor-drive unit's delivery documents.

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

    If there is no oil filter unit connected, a blank cover is mounted on pipe connection Q.

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

    The mounting instructions for the motor-drive unit are outlined in Operating Instructions no. 138.

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

    A collecting pipe for the Buchholz relay cannot be connected to the E2 connection.

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

    The protective relay must be connected after 800,000 tap-change operations.

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

    The use of the oil filter unit OF 100 is mandatory for type R on-load tap-changers with Um = 300 kV.

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

    Transformers are required to filter their switching oil to increase inspection intervals.

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

    Operators must monitor the insulating oils in the transformer according to their own discretion.

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

    The maximum number of tap-change operations recommended before contacting technical service is 1,000,000.

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

    If inspections are not conducted by MR personnel, no further reporting is necessary.

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

    A diverter switch insert should be replaced after 900,000 tap-change operations at the latest.

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

    Extending inspection intervals is a risk associated with disregarding inspection guidelines.

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

    Study Notes

    On-Load Tap-Changer Installation

    • Red-marked area on the tap changer head is crucial; it isn't covered by the diverter switch insert base plate.
    • Fixing nuts of the base plate require removal (4 M8 nuts, wrench 13).
    • Carefully extract the diverter switch insert from the oil compartment.
    • Disconnect the suction pipe by pulling from the connecting piece in the tap-changer head; be mindful of the O-rings.
    • Unscrew the rest of the connections in the tap-changer head (17 M8 nuts, wrench 13).
    • Lift the tap-changer head off the supporting flange while ensuring proper sealing.

    Attaching the Bell-Type Tank

    • Clean the sealing surface of the supporting flange before positioning the bell-type tank.
    • Place a gasket on the supporting flange; remove any spacer blocks.
    • Lift the tank over the active transformer part and secure it in place.
    • Clean sealing surfaces before mounting the tap-changer head, and apply an oil-resistant gasket.
    • Ensure alignment using adjusting bolts and markings; maintain a gap of 5-20 mm between the head and flange.

    Securing Components

    • Raise the tap-changer to align with the fixing holes; avoid dropping parts into the oil compartment to prevent diverter switch blockage.
    • Tighten the tap-changer head with 17 M8 nuts (max torque 14 Nm) in the red-marked area.
    • Reattach the suction pipe, ensuring O-rings are correctly positioned and slightly greased.
    • Reinsert the diverter switch, ensuring proper placement and securing it with 5 M8 nuts.

    Final Assembly Steps

    • Attach the tap position indicator disc correctly using its coupling pin.
    • Close the tap-changer head with a cover, ensuring the rubber gasket is in place.
    • Secure the cover with 24 screws (M10, max torque 34 Nm).
    • Verify correct operation of the diverter switch; check for audible operation and the ability to reach end positions as per connection diagrams.

    Drying Process and Oil Filling

    • A drying treatment is mandatory to ensure dielectric properties of the on-load tap-changer.
    • For vacuum-drying in an autoclave, remove the tap-changer cover first.
    • Heat the tap-changer in air at 10 °C/hr up to a maximum of 110 °C.
    • Pre-dry using circulating air; check sealing points, gaskets, and heater functionality.
    • If the protective relay triggers, thoroughly inspect the tap-changer and transformer before re-energizing; avoid operating until confirmed undamaged.

    Shipment of On-Load Tap-Changer Equipment

    • On-load tap-changer and motor-drive unit arrive in adjustment position, packed in two parts: diverter switch and tap selector.
    • Diverter switch oil compartment weighs approximately 210 kg.
    • Tap selector has an approximate weight of 500 kg.
    • Additional components include ED-S (approx. 80 kg) and a drive shaft with coupling parts weighing around 20 kg.
    • Protective relay RS 2001 weighs 3.5 kg.
    • Confirm shipment completeness using shipping documents; store parts in a dry location.
    • Maintain airtight protective wrapping until installation; remove wrapping shortly before installation.

    Installation Instructions

    • Secure tap selector to the oil compartment base using lock nuts M12 and washers, with a max tightening torque of 65 Nm.
    • Connect tap selector leads to diverter switch oil compartment carefully, ensuring secure bolt connections and screening of terminal locations.
    • Use coupling parts correctly when bolting tap selector suspension to the oil compartment base.
    • Perform a minimum number of tap-change operations without oil; return to adjustment position after transformer ratio tests.

    Drying Process and Oil Filling

    • Vacuum drying is essential for dielectric properties guarantee; can be conducted alternatively.
    • For vacuum-drying in an autoclave, remove tap-changer cover before drying.
    • Heat rapidly, increasing by approximately 10 °C/h up to a maximum of 110 °C.
    • Pre-dry in circulating air at a controlled maximum temperature.

    Pipe Connections

    • Connect suction pipe to the designated pipe connection S, ensuring it ends with a drain valve at transformer operating height.
    • Use connection Q for oil return from stationary oil filter unit; install blank cover if no filter unit is connected.
    • E2 connection is sealed with a blank cover and leads into the transformer oil tank directly below the tap-changer head.

    Mounting Motor-Drive Unit

    • Follow detailed installation instructions for the motor-drive unit, ensuring serial numbers match with the on-load tap-changer.
    • Maintain the same operating position for both motor-drive unit and tap-changer.
    • Replace diverter switch insert after approximately 800,000 tap-change operations.
    • Recommend use of stationary oil filter unit type OF100 for high operation frequency (15,000 operations/year or more), particularly with specific voltage ratings.
    • Importance of monitoring insulating oils per applicable regulations and conducting inspections as necessary, with potential reports for non-MR personnel inspections.

    Inspections

    • Strict adherence to inspection intervals is critical for the reliable operation of on-load tap-changer and transformer.

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    Description

    This quiz covers the installation of the on-load tap-changer into a bell-type tank. It highlights critical components, such as the tap position indicator disc and the significance of the marked areas. Understand the technical details and best practices for effective installation.

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