Questions and Answers
What must the dielectric strength of the diverter switch oil comply with after maintenance?
What is the typical maximum measured DC current when measuring DC resistance on a transformer?
Which factor is crucial to check in addition to the dielectric strength of the diverter switch oil?
In what scenario might overheating of transformer windings occur during DC resistance measurement?
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What is the main purpose of checking the dielectric strength after maintenance of diverter switch oil?
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What does the signal word 'WARNING' indicate?
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Which pictogram warns of electrical voltage dangers?
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What type of situation does the signal word 'CAUTION' refer to?
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Which of the following best describes 'NOTICE' in hazard communication?
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What is the primary purpose of the information system outlined in the technical file?
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Which hazard is NOT specifically indicated by the provided pictograms?
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The technical file emphasizes safe maintenance procedures to prevent which of the following?
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Which of the following descriptions corresponds to the signal word used to denote a life-threatening situation?
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What is the primary focus of the safety section in the maintenance instructions?
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Which of the following is NOT included in the scope of maintenance for the on-load tap-changer?
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What is required before removing the diverter switch insert?
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What determines the dielectric strength of the diverter switch oil during operation?
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During further checks, which operation is essential to verify the on-load tap-changer's functionality?
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What is the first action to be taken when preparing for maintenance on the tap-changer?
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Which maintenance activity involves actually replacing components of the tap-changer?
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How is the tap position indicator inserted during maintenance?
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Which aspect is critical during the commissioning of the transformer with the tap-changer?
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In maintenance procedures, what should be the focus when measuring the DC resistance?
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What is an unnecessary step when lifting out the diverter switch insert?
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Which component specifically needs to be replaced during the maintenance of the on-load tap-changer?
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What action is taken to verify mechanical and electric end stops of the kit?
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What should be used to clean the diverter switch insert?
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Which step is NOT part of inspecting the supporting cylinder?
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What should be inspected visually on the diverter switch insert?
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How many screws may need to be removed from the coupling tube depending on the version?
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What action is required if there is no thread present in the fitted bushes?
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What is the purpose of securing the bottom screening ring to the top screening ring?
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What is the first step in the process of inspecting the supporting cylinder?
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What could be a consequence of using improper cleaning agents on the diverter switch insert?
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What is the primary purpose of taking an oil sample from the diverter switch oil compartment?
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What temperature range is specified for testing the dielectric strength and water content of the diverter switch oil?
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Which component's connection requires the opening of a screw cap for venting?
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What should be checked for special design types featuring cardan shafts?
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What action must be taken after venting the pipe connection's screw cap?
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How should the horizontal drive shaft be secured between the upper gear unit and bevel gear?
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Which value must the dielectric strength and water content of the oil meet?
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What safety warning is associated with the installation process described?
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Grounding the transformer terminals is unnecessary during maintenance work.
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A working table does not need to be provided for on-load tap-changer maintenance.
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The oil quantity required for the oil change depends solely on the power rating of the transformer.
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It is sufficient to switch off the transformer to ensure safety during maintenance.
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Using improper cleaning agents on the diverter switch insert is recommended for maintaining its condition.
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The maximum weight of the diverter switch insert is 150 kg.
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The withdrawal height for 300 kV equipment is 1375 mm.
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Operating the motor-drive unit while uncoupled from the on-load tap-changer is safe.
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The highest voltage for equipment Um of 170 kV requires an oil quantity of 170 liters.
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Proper inspection of the diverter switch insert does not require visual examination.
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The operating position of the on-load tap-changer should be recorded during maintenance.
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The motor protective switch can be skipped during the adjustment position setup.
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Removing the horizontal drive shaft is the first step when accessing the diverter switch insert.
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The hand crank must be turned counterclockwise to activate the diverter switch.
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The tap-change indicator is divided into 33 sections, each representing one hand crank revolution.
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One tap-change operation is indicated by two complete rotations of the tap-change indicator.
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The VACUTAP® VM® on-load tap-changer requires that dielectric strength of the diverter switch oil is determined both during operation and after maintenance.
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The safety precautions section includes guidelines for inappropriate use of the on-load tap-changer.
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The tap-change operation begins only after the hand crank has been turned for three full revolutions.
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The tap-change supervisory control should be left powered on while removing the diverter switch insert.
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After turning the hand crank, the pointer should reach the mid-position of the gray area to determine value A.
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In the maintenance of the on-load tap-changer, inspecting the supporting cylinder is an unnecessary procedure.
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The hand crank safety switch disconnects the motor circuit at one pole.
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The document specifies that the original operating instructions were written in French.
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The time of switchover is always represented by two sections before reaching the gray field on the tap-change indicator.
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Replacing vacuum interrupters is not listed as part of the maintenance procedures for the on-load tap-changer.
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Turning the hand crank clockwise has no effect on the operation of the diverter switch.
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Additional checks must be performed after reinstalling the diverter switch insert to ensure proper function.
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Electrical and mechanical end stops are verified during routine maintenance procedures of the on-load tap-changer.
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The maintenance instructions can be reproduced and shared without permission if they are not being altered.
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The on-load tap-changer is equipped with a feature to directly communicate its condition to a remote monitoring system.
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The information system within the maintenance instructions helps in understanding critical operational details.
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After maintenance, it is necessary to clean and inspect the diverter switch oil compartment and its conservator.
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The dielectric strength of the diverter switch oil must be lower than specified limit values to ensure safe operation.
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After uncoupling the motor-drive unit and the vertical drive shaft, you should turn the drive shaft further.
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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.
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The tap-change operation can be completed by turning the hand crank in any direction before releasing it.
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The mid-position of the area on the tap-change indicator is marked in gray for easy identification during operation.
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During the operation, there is no risk of death if the on-load tap-changing operation is not completed correctly.
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It is necessary to calculate a correction value for the on-load tap-changer operation as indicated in previous steps.
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While operating the hand crank, it is essential to count the sections shown on the tap-change indicator.
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The purpose of the coupling brackets is to hold the vertical drive shaft in position permanently.
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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.
