OILTAP B
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Questions and Answers

What is crucial to avoid personal damage or malfunction during installation of the take-off contacts?

  • Follow safety, hazard, and other instructions included in the MR operating instructions. (correct)
  • Install components without prior reading of the instructions.
  • Ensure work is carried out by unqualified personnel.
  • Perform the work during unfavorable weather conditions.

    • What is required before beginning the installation of the take-off contacts?

  • To consult with personnel who have not been trained on the tap-changer types.
  • Installing the current collector disk without removal of the diverter switch insert.
  • A thorough knowledge from training about maintenance of the relevant on-load tap-changer type. (correct)
  • No prior training is necessary to proceed with the installation.

    • Which part should be removed to safely install the take-off contacts on the current collector disk?

  • Safety mechanisms should be disengaged.
  • Diverter switch insert must be removed before installation. (correct)
  • Current collector disk itself should be removed.
  • No parts need removal before installation.

    • What is indicated by the warning regarding the risk of personal injury?

    <p>Unqualified personnel may lead to accidents and legal repercussions.</p> Signup and view all the answers

    For which types are the installation instructions specifically applicable?

    <p>Variants of the OILTAP® B and C types only.</p> Signup and view all the answers

    What is the primary concern when performing work on the equipment?

    <p>Personal safety</p> Signup and view all the answers

    What component must be replaced when performing maintenance on the trip roller?

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

    What is indicated as a necessary step to ensure safety during maintenance?

    <p>Employing qualified personnel</p> Signup and view all the answers

    Which part is associated with the current collector disk in terms of installation?

    <p>Contact cylinder</p> Signup and view all the answers

    What does the protective circuit help mitigate?

    <p>Risk of malfunction</p> Signup and view all the answers

    In which section would you find information regarding coupling shaft maintenance?

    <p>Supporting cylinder/supporting bars</p> Signup and view all the answers

    Why is it critical to follow safety instructions during equipment maintenance?

    <p>To prevent personal damage or property loss</p> Signup and view all the answers

    Which component's replacement is specifically highlighted in the maintenance guidelines?

    <p>Trip roller</p> Signup and view all the answers

    Which activity must be performed to ensure the seal tightness of tap-changer head without a change-over selector?

    <p>Inspect wear or abrasion of bearing flange</p> Signup and view all the answers

    What is a critical safety requirement before performing maintenance on tap-changer type B?

    <p>Remove the selector switch</p> Signup and view all the answers

    During maintenance, what should be noted about the switching element?

    <p>The condition of all leads should be assessed.</p> Signup and view all the answers

    Which component's wear is assessed when checking the current collector disk?

    <p>Pressure springs</p> Signup and view all the answers

    What is a safety measure that must be followed when changing contacts?

    <p>Gaps between contacts and bolts should be checked.</p> Signup and view all the answers

    Which part needs to be checked for both wear and current take-off functionality?

    <p>Slide contact</p> Signup and view all the answers

    What is assessed to ensure the mechanical integrity of the locking pawl during maintenance?

    <p>Condition of locking pawl tension springs</p> Signup and view all the answers

    Which aspect of the switching cylinder needs to be inspected for wear?

    <p>Wear of toothing on top driving disk</p> Signup and view all the answers

    What should be avoided when checking the clearance of the drive roller?

    <p>Using unnecessary force</p> Signup and view all the answers

    What should be done to the bolts during maintenance checks?

    <p>Make sure all bolts are tight.</p> Signup and view all the answers

    Which components should have their condition assessed during a maintenance check of the switching element?

    <p>Wear of main contacts and condition of leading cables</p> Signup and view all the answers

    What is the maximum wear limit for take-off contacts in the current collector disk maintenance?

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

    What should be done if spring washers are not installed in the auxiliary contact carrier attachment?

    <p>Install spring washers to set the gap due to shrinkage</p> Signup and view all the answers

    Which of the following is NOT a recommended inspection for the current collector disk?

    <p>Inspect the integrity of outer casing</p> Signup and view all the answers

    During maintenance of the switching element, which aspect requires checking for axial play?

    <p>Main contact carrier</p> Signup and view all the answers

    What torque should be applied to the take-off contact head during installation?

    <p>8 Nm</p> Signup and view all the answers

    What is the first step regarding the lock tab during the installation process?

    <p>Bend one corner of the lock tab</p> Signup and view all the answers

    What alignment is necessary for the take-off contact head?

    <p>Aligned parallel to the current collector disk</p> Signup and view all the answers

    What should be done to ensure the lock tab is securely seated?

    <p>Tightly seat the bent side and guide piece together</p> Signup and view all the answers

    What action should be taken after inserting the take-off contact head with the lock tab?

    <p>Torque the head and check its alignment</p> Signup and view all the answers

    What procedure must be followed to ensure the take-off contact heads function correctly after installation?

    <p>Use tools to push in and release each take-off contact head multiple times.</p> Signup and view all the answers

    How many times should the reset force be checked per take-off contact head?

    <p>Five to ten repetitions are recommended.</p> Signup and view all the answers

    What must a take-off contact do after being pushed in according to the maintenance checks?

    <p>Automatically return to its original position.</p> Signup and view all the answers

    What tool is implied necessary for checking the reset force of the take-off contact heads?

    <p>Specialized push tools.</p> Signup and view all the answers

    Why is it important to check the reset force of the take-off contact heads after installation?

    <p>To confirm they are functioning as intended.</p> Signup and view all the answers

    What is the minimum residual value for the C350 diverter switch insert in millimeters?

    <p>10.5 Ø</p> Signup and view all the answers

    Which diverter switch insert type has no specified additional wear criteria?

    <p>C350</p> Signup and view all the answers

    For the V200 diverter switch insert, what is the maximum diameter wear that is acceptable?

    <p>22 Ø</p> Signup and view all the answers

    What is indicated as the individual wear criterion for the movable contact of the A diverter switch insert?

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

    Which option lists a type where the additional wear criterion is not defined?

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

    What is the necessary condition for the fixed contact of the C250 diverter switch insert?

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

    What is the specified minimum residual value for the SC movable contact of type A?

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

    Which type shows a unique individual wear criterion of 8 mm for both movable and fixed contacts?

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

    What diameter is associated with the fixed contact wear for the V350/700 type?

    <p>5 Ø</p> Signup and view all the answers

    What criterion is not mentioned for the contact wear of V350/500/700 types?

    <p>none</p> Signup and view all the answers

    Which data must be recorded during maintenance on tap-changer type B?

    <p>Serial numbers of tap changer and motor-drive unit</p> Signup and view all the answers

    What should be assessed regarding the sealing during maintenance without a change-over selector?

    <p>Seal tightness of the tap-changer head</p> Signup and view all the answers

    When checking the switching cylinder, what aspect requires inspection for potential cracks?

    <p>Locking pawl and eccentric</p> Signup and view all the answers

    What condition should be observed concerning the contact cylinder?

    <p>Seal tightness</p> Signup and view all the answers

    Which component of the switching element is responsible for ensuring contact stability during operation?

    <p>Main contact carrier</p> Signup and view all the answers

    What must be checked about the drive roller with the change-over selector during maintenance?

    <p>Clearance of the drive roller</p> Signup and view all the answers

    Which maintenance activity involves checking the wear of the main and auxiliary contacts?

    <p>Switching element assessment</p> Signup and view all the answers

    What is essential to verify regarding the bolts during maintenance checks?

    <p>That all bolts are tight</p> Signup and view all the answers

    What condition of the cogdisk bearing should be checked during maintenance?

    <p>Wear of the cogdisk bearing</p> Signup and view all the answers

    Which part of the motor-drive unit must be identified during maintenance?

    <p>Type of motor-drive unit</p> Signup and view all the answers

    The maximum wear limit for take-off contacts in the current collector disk maintenance is approximately 5 mm.

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

    Condition checks should include the wear of the main and auxiliary contacts in the switching element.

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

    Spring washers should not be used in the auxiliary contact carrier attachment if it is not installed.

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

    The condition of the twin flexible cables and pressure springs is evaluated during the inspection of the current collector disk.

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

    The resistance value of transition resistors does not need to be measured during maintenance checks.

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

    The take-off contact heads should be pressed and released multiple times to check the reset force.

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

    The torque applied during the installation of the take-off contact head is 50 Nm.

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

    It is unnecessary to check the reset force after the installation of the take-off contact heads.

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

    The reset force check procedure should be repeated 2 to 5 times per take-off contact head.

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

    The take-off contact must not move to its original position after being pressed.

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

    Interchanging inner guide plates with outer guide plates is not possible for all versions of the guide plates.

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

    The old version guide plates are made of rubber.

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

    Interchanging the inner guide plates with the outer guide plates is necessary for all versions.

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

    The GRP version of the guide plates is white and does not contain brass.

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

    A service report must be noted if an interchange of guide plates is carried out.

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

    The new version of guide plates is brown in color.

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

    The GRP version with brass is known as the old version.

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

    Only the old version of guide plates was manufactured before 1970.

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

    The trip roller must be replaced if it has a diameter of 21 mm in the OILTAP® B or C model.

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

    The locking pawl does not require an inspection for crack formation during maintenance.

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

    Replacing the trip roller also requires the replacement of roller bolts and split pins.

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

    The top driving disk does not need to be checked for wear during maintenance.

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

    Seal tightness is an inspection criterion for the contact cylinder.

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

    All bolts must be checked to ensure they are loose during the inspection of the switching cylinder.

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

    Condition of hard-paper cylinder is not relevant for the maintenance of the contact cylinder.

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

    The bottom driving disk is not assessed for wear during maintenance checks.

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

    The maximum acceptable diameter wear for the V200 diverter switch insert is 22 Ø.

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

    The C350 diverter switch insert has a minimum residual value of 10.5 mm for its fixed contact.

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

    No additional wear criteria are mentioned for the A diverter switch insert.

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

    The maximum individual wear criterion for the movable contact of the C250 diverter switch insert is 2 mm.

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

    The SC movable contact of type A has a minimum residual value of 23 Ø.

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

    The fixed contact wear for the V350/500/700 types is assessed with a criterion that allows a maximum diameter of 17 Ø.

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

    Individual wear for the TC movable contact in A diverter switch insert type is unspecified.

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

    The additional wear criterion related to the M type diverter switch insert is mentioned as 4 mm.

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

    For the V350/700 14 pitches, the maximum allowable diameter wear for TC types is 3 Ø.

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

    The fixed contact wear for type B diverter switch insert indicates a minimum residual value of 4 mm.

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

    Study Notes

    On-Load Tap-Changer Maintenance Checklist

    • Safety Precautions: Always prioritize safety. The document emphasizes the importance of qualified personnel and strict adherence to safety instructions to prevent injuries, damage, and malfunctions.
    • Removal of Selector Switch: The selector switch must be removed before starting any maintenance work.
    • Data Recording During Maintenance:
      • Serial numbers of the tap changer and motor drive unit.
      • Tap changer type, maximum voltage, and number of positions.
      • Number of tap-change operations.
      • Motor drive unit type.
      • Transformer data.
      • Application details.
      • Commissioning information.
    • Tap-Changer Head
      • Without Change-Over Selector:
        • Check the seal tightness of the tap-changer head.
        • Inspect the condition of the crown wheel and pinion toothing (teeth) and the flank clearance.
        • Inspect the bearing flange of the selector gear cover for wear or abrasion.
        • Assess the tripping switch for tightness and wear.
        • Check the catch of the energy accumulator housing for crack formation.
      • With Change-Over Selector:
        • Check the clearance between the drive roller of the cogwheel and the drive crank of the change-over selector.
        • Inspect the cogdisk bearing of the selector gear cover for wear.
        • Verify the indication disk attachment (welded with plastic cogwheel).
    • Contact Cylinder
      • Check for seal tightness.
      • Assess the condition of the hard-paper cylinder.
      • Inspect the contact wear.
      • Verify the current take-off ring condition.
    • Switching Cylinder
      • Inspect locking pawl and eccentric for crack formation and wear of the tripping rollers.
      • Check the condition of the locking pawl tension springs.
      • Assess wear of the top driving disk's toothing and the tight seat of its locking pawl bearing pin.
      • Inspect the bottom driving disk for tooth wear.
      • Inspect the slide contact for wear on the contact surface, as well as the condition of the current take-off lead and pressure springs.
      • Ensure smooth movement of the bearing bolt.
      • Verify all bolts are securely tightened.
      • When changing contacts, ensure proper gaps between main contacts and attachment bolts on the switching element are maintained.
    • Switching Element
      • Inspect the main and auxiliary contacts for wear.
      • Ensure the condition of all leads is adequate.
      • Verify the tightness of lock nuts for connecting plates and current collector disk. If not installed, install spring washers to compensate for shrinkage.
      • Evaluate the condition of the contact springs and their attachments.
      • Check the guide plates and inspect the contact carrier guide for wear.
      • Check for cracking and smooth running of the rotating tube.
      • Verify the secure attachment of the auxiliary contact carrier. If not installed, install spring washers to compensate for shrinkage.
      • Check the main contact carrier for axial play.
      • Examine the transition resistors; assess the condition of the resistor material, groove carrier, and resistance value.
      • Ensure all bolts are tightened securely.

    Current Collector Disk (Delta Version Only)

    - Inspect the twin flexible cables and pressure springs for defects.
- Check the smooth running and travel of guide pieces.
- Observe and measure wear of the take-off contacts; the permitted contact wear limit is 31.

    Installing Take-Off Contacts on Current Collector Disk

    • Scope of Application: These instructions apply to specific variants of OILTAP® B and C on-load tap-changer types.

    Notes for Installing Take-Off Contacts on Current Collector Disk

    • Emphasize the need for qualified personnel and adherence to safety instructions due to potential risks of personal injury, property damage, or malfunction.
    • It is crucial to remove the diverter switch insert (or selector switch insert, respectively) before starting work.
    • The instructions provide guidance for installing take-off contacts on the switching element's current collector disk for specific on-load tap-changer types (OILTAP® B and C).

    Tap-Changer Maintenance

    • Material list:
      • Trip roller
      • Roller pin
      • Split pin
      • Locking pawl with eccentric
    • Switching Element:
      • Wear of main and auxiliary contacts
      • Condition of all leads
      • Tight seat of lock nuts of connecting plates and / or current collector disk
      • Condition of contact springs and / or their attachment
      • Check of guide plates, wear of contact carrier guide
      • Check running of rotating tube, and check cracking
      • Tight seat of auxiliary contact carrier attachment
      • Main contact carrier, check axial play
      • Transition resistors, condition of resistor material and groove carrier, plus measurement of resistance value
      • Check that all bolts are tight
    • Current Collector Disk (delta version only):
      • Condition of twin flexible cables and pressure springs
      • Running and travel of guide pieces
      • Wear of take-off contacts (max.wear approx. 3 mm)
      • Check tight seat of take-off contacts
    • Max. Admissible or OLTC-Dependent Reference Dimension in mm:
      • This includes reference dimension in mm, contact wear in mm, additional wear criterions and entry in SAP documentation.
    • Check List for Maintenance:
      • Tap-changer head with cover:
        • Seal tightness of tap-changer head
        • Condition of toothing on crown wheel and pinion, flank clearance
        • Wear or abrasion of bearing flange of selector gear cover
        • Tight seat and wear of tripping switch
        • Check catch of energy accumulator housing (crack formation)
      • With change-over selector:
        • Check clearance of drive roller of cogwheel and drive crank of change-over selector
        • Wear of cogdisk bearing of selector gear cover
        • Indication disk attachment (welded with plastic cogwheel)
      • Contact cylinder:
        • Seal tightness
        • Condition of hard-paper cylinder
        • Contact wear
        • Check current take-off ring
      • Switching cylinder:
        • Locking pawl and eccentric, check for crack formation, wear of tripping rollers, condition of locking pawl tension springs
        • Top driving disk, wear of toothing and tight seat of locking pawl bearing pin
        • Bottom driving disk, wear of toothing
        • Slide contact, wear of contact surface, condition of current take-off lead and pressure springs
        • Easy movement of bearing bolt
        • Check that all bolts are tight
        • When changing contacts, check gaps between main contacts and attachment bolts on the switching element
      • Switching element:
        • Wear of main and auxiliary contacts
        • Condition of all leads
        • Tight seat of lock nuts of connecting plates and / or current collector disk
        • Condition of contact springs and / or their attachment
        • Check of guide plates, wear of contact carrier guide
        • Check running of rotating tube, and check cracking
        • Tight seat of auxiliary contact carrier attachment
        • Main contact carrier, check axial play
        • Transition resistors, condition of resistor material and groove carrier, plus measurement of resistance value
        • Check that all bolts are tight
      • Current collector disk (delta version only):
        • Condition of twin flexible cables and pressure springs
        • Running and travel of guide pieces
        • Wear of take-off contacts (max.wear approx. 3 mm)
        • Check tight seat of take-off contacts

    Take-Off Contacts:

    • Installation:
      • Bend one corner of the lock tab in the direction of the thread.
      • Insert the take-off contact head with the bent lock tab into the guide piece.
      • Secure the lock tab against turning.
      • Torque the take-off contact head to M = 8 Nm and make sure it is aligned parallel to the edge of the current collector disk.
    • Securing the take-off contact head:
      • Punch the lock tab's bent side and even guide piece side together.
      • The lock tab should be tightly seated on the guide piece.
      • Secure the opposite side of the lock tab to the take-off contact head.
      • Ensure the lock tab is tight.
    • Reset force check:
      • Check the reset force of the take-off contact heads after installation.
      • Use appropriate tools to push in and release each take-off contact head.
      • The take-off contact must move to its original position automatically.
      • Repeat the procedure several times (5-10) per take-off contact head.

    3.3 Tests and condition-based parts replacement at each maintenance

    • Contact cylinder: Seal tightness, hard-paper cylinder condition, contact wear, check current take-off ring
    • Switching cylinder: Locking pawl and eccentric, check for crack formation, wear of tripping rollers, condition of locking pawl tension springs
    • Switching cylinder: top driving disk, wear of toothing and tight seat of locking pawl bearing pin
    • Switching cylinder: bottom driving disk, wear of toothing
    • ** Switching cylinder:** slide contact, wear of contact surface, condition of current take-off lead and pressure springs
    • Switching cylinder: easy movement of bearing bolt, check that all bolts are tight
    • Switching cylinder: when changing contacts, check gaps between main contacts and attachment bolts on the switching element
    • Trip roller and locking pawl replacement: This section details the requirements for replacing a trip roller and locking pawl.
    • Trip roller replacement: In OILTAP® B or OILTAP® C tap changers, replace 21 mm trip roller with a 21.5 mm trip roller during maintenance.
    • Trip roller replacement materials: 021 946 02 trip roller, 021 947 05 roller pin, 455 090 split pin, 089 012 01 locking pawl (if necessary).
    • Switching element: Wear of main and auxiliary contacts, condition of all leads, tight seat of lock nuts of connecting plates and / or current collector disk
    • Switching element: (If not yet installed, spring washers should be installed to set the gap due to shrinkage), condition of contact springs and / or their attachment
    • Switching element: Guide plates, wear of contact carrier guide, check running of rotating tube, check cracking
    • Switching element: tight seat of auxiliary contact carrier attachment (If not yet installed, spring washers should be installed to set the gap due to shrinkage), main contact carrier, check axial play
    • Switching element: Transition resistors, condition of resistor material and groove carrier, plus measurement of resistance value, check that all bolts are tight
    • Current collector disk: (delta version only), condition of twin flexible cables and pressure springs, running and travel of guide pieces, wear of take-off contacts (max.wear approx. 3 mm)
    • Current collector disk: check tight seat of take-off contacts

    Interchange of guide plates

    • Interchange of guide plates: Replace the inner guide plates with the outer guide plates if the maximum play exceeds 2.5 mm.
    • Interchange of guide plates: Interchange is not possible for all versions of the guide plates. Contact responsible personnel if an interchange is not possible.
    • Interchange of guide plates: If an interchange is carried out, it must be noted in the service report.
    • Interchange of guide plates: The measured value is used to determine the measures to be taken during the next maintenance.

    Guide Plates Versions

    • Depending on the year of manufacture, one of three versions of the guide plates was installed:
      • Old version with hard paper: brown
      • GRP version: white, without brass
      • New version GRP: white, with brass
    • Interchange of guide plates: Replacing the inner guide plates with outer guide plates may not be possible for all guide plate versions.
    • Interchange of guide plates: Interchange is not necessary for all versions.
    • Interchange of guide plates: Details can be found in the table below.
    • Interchange of guide plates: The table outlines the delivery period, versions, properties, and interchange details for each version of the guide plates.

    Check reset force of take-off contact heads

    • After installing and securing the take-off contact heads, it is crucial to check their reset force.
    • Use appropriate tools to push in and release each take-off contact head multiple times.
    • The take-off contact must return to its original position automatically.
    • Repeat the procedure several (5 – 10) times per take-off contact head.

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    Description

    This quiz covers essential steps and precautions for the maintenance of on-load tap-changers. It focuses on safety measures, data recording, and inspection procedures to ensure reliable operation. Ideal for technicians and engineers involved in transformer maintenance.

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