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What must the dielectric strength of the diverter switch oil comply with after maintenance?
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?
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?
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?
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?
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?
What does the signal word 'WARNING' indicate?
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Which pictogram warns of electrical voltage dangers?
Which pictogram warns of electrical voltage dangers?
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What type of situation does the signal word 'CAUTION' refer to?
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?
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?
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?
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?
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?
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?
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?
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?
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?
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?
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?
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?
Which maintenance activity involves actually replacing components of the tap-changer?
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How is the tap position indicator inserted during maintenance?
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?
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?
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?
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?
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?
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?
What should be used to clean the diverter switch insert?
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Which step is NOT part of inspecting the supporting cylinder?
Which step is NOT part of inspecting the supporting cylinder?
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What should be inspected visually on the diverter switch insert?
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?
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?
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?
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?
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?
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?
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?
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?
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?
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?
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?
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?
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?
What safety warning is associated with the installation process described?
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Grounding the transformer terminals is unnecessary during maintenance work.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
