Vacutap VM Maintenance Instructions
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Questions and Answers

What must the dielectric strength of the diverter switch oil comply with after maintenance?

  • Random values determined by maintenance staff
  • Regulatory standards for transformer efficiency
  • Limit values provided in the appendix (correct)
  • Industry-wide average dielectric strengths

    • What is the typical maximum measured DC current when measuring DC resistance on a transformer?

  • 5 % of the rated current
  • 10 % of the rated current (correct)
  • 15 % of the rated current
  • 20 % of the rated current

    • Which factor is crucial to check in addition to the dielectric strength of the diverter switch oil?

  • Ambient pressure conditions
  • Insulation thickness of the transformer
  • Operating temperature of the switch
  • Water content of the oil (correct)

    • In what scenario might overheating of transformer windings occur during DC resistance measurement?

    <p>Exceeding 10 % of the rated current during measurement</p> Signup and view all the answers

    What is the main purpose of checking the dielectric strength after maintenance of diverter switch oil?

    <p>To ensure the oil can withstand high voltage without breakdown</p> Signup and view all the answers

    What does the signal word 'WARNING' indicate?

    <p>A hazardous situation that could result in death or serious injury</p> Signup and view all the answers

    Which pictogram warns of electrical voltage dangers?

    <p>Warning of dangerous electrical voltage</p> Signup and view all the answers

    What type of situation does the signal word 'CAUTION' refer to?

    <p>A hazardous situation which could result in minor or moderate injury</p> Signup and view all the answers

    Which of the following best describes 'NOTICE' in hazard communication?

    <p>It signals measures needed to prevent property damage.</p> Signup and view all the answers

    What is the primary purpose of the information system outlined in the technical file?

    <p>To enhance understanding of specific procedures</p> Signup and view all the answers

    Which hazard is NOT specifically indicated by the provided pictograms?

    <p>Risk of slipping on wet surfaces</p> Signup and view all the answers

    The technical file emphasizes safe maintenance procedures to prevent which of the following?

    <p>Injury or property damage</p> Signup and view all the answers

    Which of the following descriptions corresponds to the signal word used to denote a life-threatening situation?

    <p>WARNING signifies a critical injury risk</p> Signup and view all the answers

    What is the primary focus of the safety section in the maintenance instructions?

    <p>Operator's duty of care</p> Signup and view all the answers

    Which of the following is NOT included in the scope of maintenance for the on-load tap-changer?

    <p>Calibration of automatic control systems</p> Signup and view all the answers

    What is required before removing the diverter switch insert?

    <p>Switching off the supply voltage to the tap-change supervisory control</p> Signup and view all the answers

    What determines the dielectric strength of the diverter switch oil during operation?

    <p>Regular testing as per maintenance intervals</p> Signup and view all the answers

    During further checks, which operation is essential to verify the on-load tap-changer's functionality?

    <p>Checking the mechanical end stop</p> Signup and view all the answers

    What is the first action to be taken when preparing for maintenance on the tap-changer?

    <p>Switching off all power sources</p> Signup and view all the answers

    Which maintenance activity involves actually replacing components of the tap-changer?

    <p>Replacing fixed oil compartment contacts</p> Signup and view all the answers

    How is the tap position indicator inserted during maintenance?

    <p>By aligning it with the coupling tube</p> Signup and view all the answers

    Which aspect is critical during the commissioning of the transformer with the tap-changer?

    <p>Conducting trial tap-change operations</p> Signup and view all the answers

    In maintenance procedures, what should be the focus when measuring the DC resistance?

    <p>Reading must align with manufacturer specifications</p> Signup and view all the answers

    What is an unnecessary step when lifting out the diverter switch insert?

    <p>Connecting auxiliary lifting equipment</p> Signup and view all the answers

    Which component specifically needs to be replaced during the maintenance of the on-load tap-changer?

    <p>Vacuum interrupters</p> Signup and view all the answers

    What action is taken to verify mechanical and electric end stops of the kit?

    <p>Performing mechanical exercise tests</p> Signup and view all the answers

    What should be used to clean the diverter switch insert?

    <p>Transformer oil</p> Signup and view all the answers

    Which step is NOT part of inspecting the supporting cylinder?

    <p>Slide down the supporting cylinder</p> Signup and view all the answers

    What should be inspected visually on the diverter switch insert?

    <p>Creepage paths and signs of discharge</p> Signup and view all the answers

    How many screws may need to be removed from the coupling tube depending on the version?

    <p>3 or 6 screws</p> Signup and view all the answers

    What action is required if there is no thread present in the fitted bushes?

    <p>Cut an M10 thread</p> Signup and view all the answers

    What is the purpose of securing the bottom screening ring to the top screening ring?

    <p>To facilitate removal of the coupling tube</p> Signup and view all the answers

    What is the first step in the process of inspecting the supporting cylinder?

    <p>Remove screws from bottom end</p> Signup and view all the answers

    What could be a consequence of using improper cleaning agents on the diverter switch insert?

    <p>Damage to on-load tap-changer and transformer</p> Signup and view all the answers

    What is the primary purpose of taking an oil sample from the diverter switch oil compartment?

    <p>To analyze the dielectric strength and water content</p> Signup and view all the answers

    What temperature range is specified for testing the dielectric strength and water content of the diverter switch oil?

    <p>20 °C ± 5 °C</p> Signup and view all the answers

    Which component's connection requires the opening of a screw cap for venting?

    <p>Vent pipe connection S</p> Signup and view all the answers

    What should be checked for special design types featuring cardan shafts?

    <p>The expansion bellows and lubricant reservoir</p> Signup and view all the answers

    What action must be taken after venting the pipe connection's screw cap?

    <p>Close the screw cap again</p> Signup and view all the answers

    How should the horizontal drive shaft be secured between the upper gear unit and bevel gear?

    <p>With coupling brackets and screws</p> Signup and view all the answers

    Which value must the dielectric strength and water content of the oil meet?

    <p>The values provided in the appendix</p> Signup and view all the answers

    What safety warning is associated with the installation process described?

    <p>Danger of death or severe injury</p> Signup and view all the answers

    Grounding the transformer terminals is unnecessary during maintenance work.

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

    A working table does not need to be provided for on-load tap-changer maintenance.

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

    The oil quantity required for the oil change depends solely on the power rating of the transformer.

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

    It is sufficient to switch off the transformer to ensure safety during maintenance.

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

    Using improper cleaning agents on the diverter switch insert is recommended for maintaining its condition.

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

    The maximum weight of the diverter switch insert is 150 kg.

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

    The withdrawal height for 300 kV equipment is 1375 mm.

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

    Operating the motor-drive unit while uncoupled from the on-load tap-changer is safe.

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

    The highest voltage for equipment Um of 170 kV requires an oil quantity of 170 liters.

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

    Proper inspection of the diverter switch insert does not require visual examination.

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

    The operating position of the on-load tap-changer should be recorded during maintenance.

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

    The motor protective switch can be skipped during the adjustment position setup.

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

    Removing the horizontal drive shaft is the first step when accessing the diverter switch insert.

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

    The hand crank must be turned counterclockwise to activate the diverter switch.

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

    The tap-change indicator is divided into 33 sections, each representing one hand crank revolution.

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

    One tap-change operation is indicated by two complete rotations of the tap-change indicator.

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

    The VACUTAP® VM® on-load tap-changer requires that dielectric strength of the diverter switch oil is determined both during operation and after maintenance.

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

    The safety precautions section includes guidelines for inappropriate use of the on-load tap-changer.

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

    The tap-change operation begins only after the hand crank has been turned for three full revolutions.

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

    The tap-change supervisory control should be left powered on while removing the diverter switch insert.

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

    After turning the hand crank, the pointer should reach the mid-position of the gray area to determine value A.

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

    In the maintenance of the on-load tap-changer, inspecting the supporting cylinder is an unnecessary procedure.

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

    The hand crank safety switch disconnects the motor circuit at one pole.

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

    The document specifies that the original operating instructions were written in French.

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

    The time of switchover is always represented by two sections before reaching the gray field on the tap-change indicator.

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

    Replacing vacuum interrupters is not listed as part of the maintenance procedures for the on-load tap-changer.

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

    Turning the hand crank clockwise has no effect on the operation of the diverter switch.

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

    Additional checks must be performed after reinstalling the diverter switch insert to ensure proper function.

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

    Electrical and mechanical end stops are verified during routine maintenance procedures of the on-load tap-changer.

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

    The maintenance instructions can be reproduced and shared without permission if they are not being altered.

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

    The on-load tap-changer is equipped with a feature to directly communicate its condition to a remote monitoring system.

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

    The information system within the maintenance instructions helps in understanding critical operational details.

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

    After maintenance, it is necessary to clean and inspect the diverter switch oil compartment and its conservator.

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

    The dielectric strength of the diverter switch oil must be lower than specified limit values to ensure safe operation.

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

    After uncoupling the motor-drive unit and the vertical drive shaft, you should turn the drive shaft further.

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

    The coupling of the motor-drive unit and the on-load tap-changer should be done by refitting the vertical drive shaft and applying a torque of 9 Nm.

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

    The tap-change operation can be completed by turning the hand crank in any direction before releasing it.

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

    The mid-position of the area on the tap-change indicator is marked in gray for easy identification during operation.

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

    During the operation, there is no risk of death if the on-load tap-changing operation is not completed correctly.

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

    It is necessary to calculate a correction value for the on-load tap-changer operation as indicated in previous steps.

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

    While operating the hand crank, it is essential to count the sections shown on the tap-change indicator.

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

    The purpose of the coupling brackets is to hold the vertical drive shaft in position permanently.

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

    Study Notes

    Introduction

    • The manual includes maintenance instructions for the VACUTAP® VM® on-load tap-changer.
    • It covers various topics from safety guidelines to detailed maintenance procedures.

    Safety

    • General safety information is emphasized to prevent accidents during operation.
    • Appropriate use is crucial; improper usage can lead to equipment damage or safety hazards.
    • Personnel qualifications are outlined to ensure trained staff operate and maintain the equipment.

    Monitoring During Operation

    • Continuous monitoring is essential to maintain efficient tap-changer operation.

    Product Description

    • Functionality and various models of the on-load tap-changer are detailed for user understanding.
    • Type designations provide specificity for different configurations.

    Maintenance Scope and Intervals

    • Regular maintenance schedules are necessary to ensure operational efficiency and safety.
    • Dielectric strength tests for diverter switch oil assess insulation quality at different operational phases.

    Preparatory Work

    • Safety precautions must be taken before beginning maintenance tasks.
    • Necessary auxiliary equipment should be prepared and available.

    Diverter Switch Insert Removal and Maintenance

    • Detailed steps for safely removing the diverter switch insert include switching off voltage and checking alignment.
    • Cleaning, checking, and inspecting components like the diverter switch oil compartment and vacuum interrupters are essential for optimal performance.

    Reinstalling Diverter Switch Insert

    • Guidelines on re-inserting components and securing the head cover to maintain system integrity post-maintenance.

    Further Checks

    • Trial tap-change operations are to be performed to ensure functionality after maintenance.
    • All mechanical and electric limits should be verified for safe operation of the device.

    Commissioning

    • The manual outlines steps for commissioning the transformer following maintenance checks.

    Appendices

    • Maintenance schedules and limit values for dielectric strength and water content are included for quick reference.
    • Adjustment plans for various configurations of the VACUTAP® VM® on-load tap-changer provide guidance for specific maintenance tasks or installations.### Warning Signal Words
    • WARNING indicates possible death or serious injury if not avoided.
    • CAUTION suggests minor or moderate injury risk if not avoided.
    • NOTICE refers to precautions to prevent property damage.

    Pictograms

    • Pictograms communicate specific hazards.
      • Warning of a danger point
      • Warning of dangerous electrical voltage
      • Warning of combustible substances
      • Warning of tipping dangers

    Safety Information

    • The technical file provides comprehensive guidelines for safe product maintenance.
    • Dielectric strength of diverter switch oil must meet specified limits after maintenance.
    • DC resistance measurements on transformers should adhere to maximum current guidelines to prevent overheating.

    Maintenance Guidelines

    • Clean diverter switch inserts with new transformer oil only; other agents can cause damage.
    • Conduct a thorough visual inspection of the diverter switch for mechanical or electrical damage.
    • Inspect under adequate lighting for issues such as discharge marks or compromised creepage paths.

    On-load Tap-Changer Maintenance

    • Steps to inspect supporting cylinder and coupling tube:
      • Remove screws from supporting cylinder's bottom end.
      • Utilize a screw in the screw nut to facilitate clamping sleeve removal.
      • Unscrew and detach the supporting cylinder.
      • Depending on design, remove screws from coupling tube's bottom.
    • Secure the bottom screening ring to the top screening ring during disassembly.

    Diverter Switch Insert Handling

    • For vent pipe connection, open the screw cap to vent the system, then reseal.
    • Sample oil from the diverter switch oil compartment and promptly record its temperature.
    • Measure dielectric strength and water content of the oil sample at 20 °C ± 5 °C, ensuring they meet the appendix's limit values.

    Horizontal Drive Shaft Installation

    • Secure the horizontal drive shaft between the upper gear unit and bevel gear using coupling brackets.
    • Use hose clips to attach the guard plate to the drive shaft.
    • For models with cardan shafts, check expansion bellows and lubricant reservoirs according to operating instructions.

    Hazard Precaution

    • WARNING label signifies extreme risk of death or severe injury; appropriate safety measures are essential.

    Introduction

    • Maintenance instructions pertain to the VACUTAP® VM® on-load tap-changer.
    • Document is owned by Maschinenfabrik Reinhausen with rights reserved.

    Safety

    • Danger exists when working with energized transformers; strict adherence to safety protocols is crucial.
    • Key safety measures include switching off the transformer, locking it to prevent restarts, and grounding all terminals.

    Monitoring During Operation

    • Continuous monitoring during the operation of the on-load tap-changer is essential for safe and reliable functioning.

    Product Description

    • Provides function description and outlines different models and type designations of the VACUTAP® VM®.

    Maintenance Scope and Intervals

    • Regular maintenance intervals are specified for optimal performance of the diverter switch.
    • Dielectric strength of diverter switch oil must be measured periodically both during operation and after maintenance.

    Preparatory Work

    • Safety precautions and necessary auxiliary equipment must be outlined before performing maintenance tasks.
    • The on-load tap-changer must be moved to an adjustment position for effective servicing.

    Diverter Switch Insert Removal

    • Detailed steps for removing various components, including horizontal drive shaft and oil levels, to access diverter switch inserts.

    Maintenance Procedures

    • Involves cleaning, inspecting, and replacing components within the on-load tap-changer system.
    • Important tasks include checking diverter switch oil compartment, measuring transition resistors, and replacing vacuum interrupters.

    Inserting Diverter Switch Insert

    • Requires specific connection and operational checks once the diverter switch insert is in place.

    Further Checks

    • Trial tap-change operations must be performed to ensure proper functionality after maintenance.
    • Several components including protective relays must be checked for operational integrity.

    Commissioning

    • Guidelines for the final commissioning of the transformer ensure all systems are ready for use.

    Additional Resources

    • An extensive appendix provides detailed maintenance schedules, limits for dielectric strength and water content, and various adjustment plans for different tap-changer configurations.### Voltage and Oil Quantity Specifications
    • Highest voltage ratings for equipment (Um) include: 72.5 kV, 123 kV, 170 kV, 245 kV, and 300 kV.
    • Corresponding oil quantities required are: 130 liters, 150 liters, 170 liters, 190 liters, and 210 liters.
    • The maximum weight for the diverter switch insert is 120 kg.
    • Withdrawal heights for equipment are specified as: 863 mm, 993 mm, 1123 mm, 1223 mm, and 1375 mm.

    Preparatory Work for On-load Tap-changer

    • Caution is necessary to prevent damage to both the on-load tap-changer and transformer.
    • The motor-drive unit should never be operated if it is not coupled to the on-load tap-changer.
    • It is recommended to block the motor-drive unit electrically by actuating the motor protective switch prior to adjustments.
    • Record the current operating position of the on-load tap-changer before making adjustments.

    Removing Diverter Switch Insert

    • To initiate the removal of the diverter switch insert, attach a hand crank to the shaft in the motor-drive unit.
    • Using the hand crank, turn it clockwise to activate the hand crank safety switch, which disconnects the motor circuit.
    • Monitor the tap-change indicator to reflect the progress of the tap-change operation.

    Inserting Diverter Switch Insert

    • Completion of one on-load tap-change operation is indicated by one full rotation of the tap-change indicator.
    • The tap-change indicator consists of 33 sections, each corresponding to one revolution of the hand crank.
    • The duration of the switchover depends on the specifics of the tap-changer type.
    • After the diverter switch operation commences, continue turning the hand crank while noting the count until the mid-position of the gray-marked area on the tap-change indicator is reached.

    Safety Protocols

    • Always ensure that the on-load tap-changer operation is fully completed by turning the hand crank in the same direction until the mid-position is reached.
    • Emphasize that there is no need for correction calculations if coupling is done correctly.
    • Continuous monitoring and careful counting are vital during the operation to ensure safe and accurate functioning.

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    Description

    This quiz focuses on the maintenance instructions for the ON-LOAD TAP-CHANGER, specifically the VACUTAP® VM®. It covers essential practices and considerations to ensure the optimal performance and longevity of the device. Ideal for maintenance technicians and engineers working with tap-changers.

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