Questions and Answers
What does the designation of the basic connection diagram indicate?
Which aspect is NOT typically illustrated in the basic connection diagram?
What type of connection is indicated by the acronym 'Y'?
What is typically specified by the term 'max. rated through-current'?
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In addition to the number of poles, what is one of the indications of the contact circle pitch?
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Which of the following is most closely associated with the term 'max. rated voltage'?
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What defines the number of operating positions in an on-load tap-changer?
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What does the term 'Höchstevoltage' relate to in the context of the equipment specifications?
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What is the primary consequence of using spare parts from different origins in on-load tap-changers?
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Which action is strictly prohibited as per the documentation?
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What does the document emphasize regarding the use of original parts?
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What liability is stated in the document concerning violations of copying and distribution rules?
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What is the main focus of the safety precautions mentioned?
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What specific warning is highlighted concerning the tap-changer and transformer?
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What is the required action for switching elements delivered before July 2006 after a specific number of operations?
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How often should energy accumulator springs be replaced for equipment delivered up to July 2006?
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What is necessary for adjusting the contact stroke of the vacuum interrupter?
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What should be checked visually for the guide rollers and control rollers?
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For equipment delivered after July 2006, what is the replacement requirement for switching elements?
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Which statement accurately reflects the condition of transition resistors?
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What is the inspection frequency for switching elements according to their delivery date?
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Which action should be taken if the guide rollers show signs of wear?
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What must be removed before lifting out the on-load tap-changer insert if it is fitted?
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What direction should the mounting rod be pre-stressed when lifting out the on-load tap-changer insert?
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How much should the on-load tap-changer insert be lifted out at maximum?
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What happens to the insert once it leaves the guiding mechanism in the bottom bearing?
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What is a potential consequence of improperly lifting the on-load tap-changer insert?
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What is indicated by exposing the contacts of the bottom phase during the lifting process?
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Which tool is referenced as part of the process for lifting the on-load tap-changer insert?
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What precautionary measure is emphasized regarding the handling of the on-load tap-changer insert?
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What is the approximate oil capacity of the VV III-76 kV on-load tap-changer?
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What is the withdrawal height of the VV I-145 kV?
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Which voltage rating is NOT listed for the VV I on-load tap-changer?
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What is the maximum weight of the on-load tap-changer insert?
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How should locking pins and gaskets be handled after disassembly?
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Which tool is mentioned as part of the maintenance procedure?
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What is the length of the mounting rod for the VV I?
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Why should the Technical Service department be contacted in advance?
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The minimum dielectric strength Ud for on-load tap-changer oil is 25 kV/2.5 mm.
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Qualified personnel are required to perform maintenance on the on-load tap-changer insert due to the associated risk of injury.
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The limit values for dielectric strength are set by IEC 60154.
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Cleaning the on-load tap-changer oil compartment is a task outlined in the maintenance work.
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The maximum water content in the on-load tap-changer oil must remain below 40 ppm during operation.
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Only skilled maintenance personnel are allowed to withdraw and reinsert the on-load tap-changer.
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Improper handling of the on-load tap-changer insert can result in electrical failure.
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The document authorizes copying and distribution without any restrictions.
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The on-load tap-changer can be modified after the maintenance manual is published.
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Safety instructions and specific safety instructions are combined in a single section in the maintenance manual.
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The function principle of the on-load tap-changer is detailed in section 3.2 of the manual.
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The insulating oils in the transformer do not require regular monitoring by the operator.
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The maintenance manual includes a section on design/types of the on-load tap-changer.
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It is necessary to check the oil quality of on-load tap-changer oil at regular intervals only if the tap-changer is used at the neutral point of windings.
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The assemblies and subassemblies of the on-load tap-changer are valid for deliveries after July 2006.
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Naked flames, hot surfaces, or sparks should be prevented from arising in the immediate vicinity of the electrical heater.
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There is a dedicated section for safety regulations at the beginning of the maintenance manual.
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A function test of the protective relay should be performed randomly without following the operating instructions.
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The maximum weight of the on-load tap-changer insert is mentioned under section 2 of the manual.
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The information provided during processing of relevant offers is non-binding according to the maintenance manual.
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The silica gel breather for the on-load tap-changer oil conservator must be in perfect condition for safe operation.
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Monitoring the quality of on-load tap-changer oil is optional and can be done at the operator's discretion.
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Static charging can create sparks that potentially lead to explosive hazards near electrical installations.
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The protective housing of the motor-drive unit does not require correct functioning to ensure safety.
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The maximum measured current when changing the operating position of a diverter switch oil compartment filled with insulating oil is 10 A DC.
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DC resistance measurement should always be performed with the measured current at 0 A when changing the operating position.
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The maximum measured DC current for a diverter switch oil compartment empty is 50 A DC.
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The rated current of the measured transformer winding is typically allowed to exceed 10% during DC resistance measurement.
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Maintenance documentation specifies that copying and distribution are prohibited unless explicitly authorized.
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All rights are reserved concerning the grant of a patent, utility model, or ornamental design registration in the mentioned document.
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The maximum allowable DC current for measuring resistance is uniform across all operational scenarios.
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Serious injuries or death can result from improper maintenance of transformers.
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The gearing can be safely lifted out by using a fork lift.
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When lifting out the gearing, the position of the column in the oil compartment may not remain perfectly vertical.
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Riveted retaining brackets are necessary for lifting out the gearing.
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The manual explicitly permits copying and distribution without authorization.
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The lifting process requires pivoting the gearing away from the driving toothed wheel.
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The statement about offenders being liable for damages applies only to actions related to unauthorized copying.
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Lifting the gearing involves a complex mechanical system requiring multiple tools.
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Switching elements must be handled with care due to their proximity to current take-off rings during the lifting process.
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Study Notes
On-load Tap-changer Specifications
- Number of poles and contact circle pitch critical for operational efficiency.
- Rated voltages include 40 kV, 76 kV, and 145 kV across models.
- Oil capacity varies with model: approximately 100-265 liters.
- Withdrawal heights range from 920 mm to 2310 mm depending on the model.
Maintenance Considerations
- Contact Technical Service for spare parts and maintenance scheduling, including serial number and tap-change operation count.
- Replace components like locking pins, screws, and gaskets post-disassembly to ensure safety and functionality.
- Use only original MR spare parts to maintain operational integrity of the tap-changer and transformer.
Safety and Handling
- Precautions necessary to avoid injury or damage to equipment during maintenance.
- Oil suction pipe removal is a prerequisite before lifting the tap-changer insert.
- Proper lifting techniques must be followed to prevent damage; pre-stressing the mounting rod aids in safe removal.
Inspection and Replacement Guidelines
- Regular inspection of switching elements is essential; tools required for contact stroke adjustments.
- Equipment delivered before July 2006 requires switching element replacement after 450,000 tap-change operations.
- For equipment delivered post-July 2006, replacement interval extends to every 600,000 operations.
- Energy accumulator springs must be replaced every 150,000 operations for devices delivered before July 2006.
Cleaning and Maintenance Tools
- Use highly-absorbent, lint-free cleaning rags during maintenance.
- A crane or MR lifting device is recommended for handling tap-changer inserts, with a max weight limit of 50 kg.
Documentation and Legal Notes
- Copying or distributing maintenance details is strictly prohibited unless authorized.
- Liability for damages may apply for unauthorized use or distribution of proprietary documents.
Safety Considerations
- Emphasizes the importance of safety during maintenance work on the VACUTAP® VV on-load tap-changer.
- Requires qualified personnel for maintenance to mitigate risks of injury or death.
- Maintenance procedures must avoid flames, hot surfaces, or sparks to prevent accidents.
- Insulating oil must be monitored regularly for quality; specific limits for dielectric strength and water content are established.
Design and Operation
- Describes the on-load tap-changer's type designation and operating principle.
- Maintenance is essential for ensuring operational efficiency, including cleaning the oil compartment and tap-changer insert.
- The document outlines different designs and assemblies valid for products delivered up to July 2006.
Maintenance Scope
- Involves critical tasks such as cleaning the oil compartment and testing insulation oil quality.
- The maintenance manual provides details on performing safe withdrawal and reinsertion of the tap-changer unit.
Measuring DC Resistance
- Details procedures for measuring DC resistance in various operational positions of the on-load tap-changer.
- Maximum measured currents are specified for both interrupting and non-interrupting scenarios, emphasizing the importance of limiting heating during measurement.
Equipment Handling
- Safety precautions must be taken when lifting the gearing of the tap-changer.
- Instructions highlight the need for careful handling to prevent misalignment of components during maintenance.
- Use of figures in the manual aids in visual understanding of the maintenance tasks.
Legal and Compliance Notes
- Copying and distribution of the maintenance manual content are prohibited without authorization.
- The document is subject to updates, with the company reserving the right to modify technical data and delivery scope.
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Description
This quiz focuses on concepts related to electrical poles and voltage levels. Test your knowledge on the number of poles and the highest voltages involved in electrical systems. Perfect for students studying electrical engineering.
