Questions and Answers
What does the rupture disk respond to?
A defined overpressure in the oil compartment of the on-load tap-changer.
The MPREC® pressure relief device is supplied with the rupture disk.
False
What does the tap-change supervisory device monitor?
It monitors both the drive shaft between on-load tap-changer(s) and motor-drive unit and the correct switching of the diverter switch.
What does the temperature monitoring system track?
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What is one component of the drive shaft?
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The drive shaft consists of a ______ tube.
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The drive shaft configuration requires the use of an intermediate bearing only when exceeding 2472 mm.
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What must be done to ensure the safety during commissioning?
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What should be checked regarding the insulating fluid during commissioning?
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What is the purpose of the signaling contact for minimum insulating fluid fill level?
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What is the main purpose of the VACUTAP® VM®?
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The product can be used with an oil filter unit.
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What must match if the on-load tap-changer and its accessories are supplied as a set?
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The hand crank can be used to operate the motor-drive unit before disconnecting the transformer.
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The manufacturer of the VACUTAP® VM® is _.
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When is the use of the hand crank permitted for operating the motor-drive unit?
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Which of the following statements about warning notices is correct?
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What should you do if the hand crank is difficult to move?
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What is the contact information for Maschinenfabrik Reinhausen GmbH?
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An operation is considered an emergency operation if a tap-change operation is absolutely necessary when a transformer is ______.
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What should be worn to prevent injuries during operation and maintenance?
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What must be checked if the protective relay has tripped?
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What should be ensured regarding the work area?
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The product is designed solely for use in electrical energy systems.
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What action should be taken if insulating fluid is leaking from the on-load tap-changer head cover?
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Which of the following is considered inappropriate use of the product?
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Which of the following is a warning related to the operation of the motor-drive unit?
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Condensate in the protective housing of the motor-drive unit is acceptable.
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What must be done after a tap-change supervisory device has been activated?
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What must be regularly checked to ensure safe operation of the product?
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Highly flammable or explosive gases can be present in areas where maintenance should occur.
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What condition must the product be operated in?
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Which type of materials should only be used as auxiliary materials?
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What is required for personnel responsible for maintaining the product?
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Who should modifications to the product be discussed with?
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What is the purpose of personal protective equipment?
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What must be worn to minimize risks to health during work?
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What is the function of the protective relay in an on-load tap-changer?
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What is used to protect the on-load tap-changer from impermissible pressure increases?
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Which of the following best describes an on-load tap-changer?
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The person responsible for assembly and maintenance must ensure personnel are sufficiently qualified in __________.
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What should you do if the pressure monitoring device tripped?
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What is the first step to take if the sensor is in the OFF position?
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What should you contact Maschinenfabrik Reinhausen about if the sensor is in OFF position?
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What is a danger when working on the on-load tap-changer?
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It is safe to switch on the transformer immediately after the pressure monitoring device trips.
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What should you check for annually as part of the inspection?
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What action should be taken after every 300,000 switching operations of the on-load tap-changer?
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What should be done if the dielectric strength and water content are not compliant?
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The maintenance intervals for the on-load tap-changer do not depend on whether there is an MR monitoring system in place.
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What should be checked every two years for on-load tap-changers?
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What must be ensured before operating the motor-drive unit?
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Study Notes
Introduction
- Technical file contains operational monitoring, fault elimination, and maintenance procedures.
- Intended for trained and authorized personnel only.
- Supporting documents include unpacking instructions, connection diagrams, and dimensional drawings.
Manufacturer Information
- Maschinenfabrik Reinhausen GmbH, Regensburg, Germany.
- Contact: +49 941 4090-0, [email protected], www.reinhausen.com.
Safety Instructions
- Read and familiarize with safety instructions to avoid risks during use.
- Product is designed for on-load tap-changing in electrical energy systems, maintaining load flow.
Appropriate Use
- Only use with specified transformer/motor-drive unit.
- Must match serial numbers for tap-changer and accessories.
- Operate according to technical specifications and employ qualified personnel.
- Designed for sinusoidal 50/60 Hz AC with specific current and voltage ratings.
Inappropriate Use
- Using the product outside specified design conditions is prohibited.
- Risks of short circuits and electrical overloads can lead to injury and damage.
Fundamental Safety Guidelines
- Personal protective equipment (PPE) such as helmets and gloves is essential.
- Keep work area clean and well-lit to prevent accidents.
- Regularly check the operational condition and safety equipment.
- Avoid installation or maintenance in explosive atmospheres.
Ambient Conditions and Materials
- Operate only under specified ambient conditions to ensure safety.
- Use only manufacturer-approved materials and fluids to prevent malfunctions.
Modifications and Conversions
- Unauthorized changes can result in personal injury and operational faults.### Spare Parts and Modification
- Consult Maschinenfabrik Reinhausen GmbH before modifying any product.
- Using unapproved spare parts can cause physical injury, product damage, and malfunctions.
- Only approved spare parts from Maschinenfabrik Reinhausen GmbH should be used.
Personnel Qualifications
- Assembly, commissioning, operation, maintenance, and inspection must be performed by qualified personnel.
- Electrically Skilled Person: Has technical qualifications, able to identify and avoid hazards, works on electrical systems, trained for specific environments, must comply with safety regulations.
- Electrically Trained Person: Receives guidance from an electrically skilled person, works under their supervision, understands typical dangers and safety measures.
- Operator: Utilizes the product as instructed, must receive training on specific tasks and potential hazards.
- Maintenance, repairs, and retrofitting should be performed by the Technical Service department of Maschinenfabrik Reinhausen GmbH or by authorized personnel.
Personal Protective Equipment (PPE)
- Wear appropriate PPE to minimize health risks.
- Ensure PPE is undamaged; follow workplace information regarding PPE.
- Types of PPE include:
- Protective Clothing: Close-fitting to prevent catching on moving parts.
- Safety Shoes: Protect against falling objects and slipping.
- Safety Glasses: Shield eyes from debris and liquids.
- Visor: Protects the face from hazardous substances.
- Hard Hat: Guards against falling and flying materials.
- Hearing Protection: Prevents hearing damage.
- Protective Gloves: Shield against mechanical, thermal, and electrical hazards.
Product Overview: On-Load Tap-Changer
- Used to adjust transformer transmission ratios without interrupting load flow, compensates for voltage fluctuations in power transmission.
- Operated via a motor-drive unit that changes its position based on control impulses.
- Key components include the transformer tank, motor-drive unit, drive shafts, and protective relays.
Setup and Models
- On-load tap-changer includes multiple pipe connections, designed for various functions.
- Pipe connections are fitted with bends at the factory and can be manipulated based on requirements.
Protective Devices
- Protective Relay: Monitors flow rate of insulating fluid; triggers circuit breakers in case of faults.
- Pressure Monitoring Device (DW 2000): Prevents excessive pressure increases in the tap-changer; responds to pressure changes and resets manually after activation.
- Rupture Disk: A pressure relief device that responds to overpressure in the oil compartment.
- Tap-Change Supervisory Device: Monitors the operation of the tap-changer's components.
- Temperature Monitoring System: Tracks insulating fluid temperatures.
Drive Shaft
- Connects the motor drive to the on-load tap-changer; utilizes bevel gears to change operational direction.
- Consists of a square tube linked with coupling brackets and bolts.
- Specifications and configurations may require additional support, such as intermediate bearings, for extensive distances between components.### Drive Shaft Configurations
- Drive shaft configurations vary based on the presence of cardan joints and insulators.
- For configurations without intermediate bearings, the length ( V_1 ) must be less than or equal to 2472 mm.
- An intermediate bearing is required when ( V_1 ) exceeds 2472 mm.
- Specific minimum lengths for drive shafts include:
- Without cardan joint and insulator: Minimum 706 mm.
- With cardan joints without an insulator: Minimum ( 798 , \text{mm} ) for ( V_1 > 2564 , \text{mm} ).
- With cardan joints with insulator: Minimum ( 978 , \text{mm} ) for ( V_1 > 2772 , \text{mm} ).
- Maximum permissible axial offsets are:
- 2° for configurations without insulators.
- 20° for configurations with cardan joints.
Commissioning Procedures
- Important safety warning: Ensure no ignition sources are present during commissioning due to the risk of explosion from explosive gases.
- The on-load tap-changer must be filled with approved insulating fluid to prevent damage.
- Procedures for commissioning include:
- Establish pressure equalization before filling the oil compartment.
- Collect and analyze an insulating fluid sample.
- Record sample temperature and assess dielectric strength and water content.
Bleeding Procedures
- Proper bleeding of the on-load tap-changer and suction pipes is crucial for insulation capability.
- Steps for bleeding include:
- Opening all relevant valves and removing air-vent screws to let trapped air escape.
- Ensuring the suction pipe is completely bled to maintain insulation quality.
Motor-Drive Unit Checks
- Ensure that the motor-drive unit is fully submerged in insulating fluid before operation.
- Conduct thorough checks on the coupling and functionality of the motor-drive unit.
- Perform trial tap-change operations across all settings to verify the alignment of indicators.
Protective Relay Testing
- Verify the correct functioning of protective relays before transformer commissioning.
- Procedures include grounding the transformer and testing both passive and active protection measures.
- Ensure the automatic fire extinguishing device is deactivated during testing.
Pressure Monitoring Device Checks
- Confirm sensor functionality on the pressure monitoring device before transformer operation.
- Conduct both passive and active tests to ensure the sensor reacts appropriately to detect pressure anomalies.
Transformer Commissioning Steps
- Ensure all interconnected safety measures and devices are operational prior to energization.
- Execute the start-switch operation after verifying the insulator fluid levels and completeness of oil compartment filling.
Safe Operation of the Motor-Drive Unit
- Manual operation using a hand crank is only permitted under specific circumstances, such as when a transformer is disconnected.
- Clear procedures must be followed when using the hand crank to avoid damage to the on-load tap-changer.
- Emergency operations necessitate strict compliance with safety guidelines due to the risk associated with energized transformers.
Fault Elimination
- Alerts users to danger from explosive gases and the risks associated with tripping protective devices.
- Any instance of protective relay tripping indicates potential damage; the transformer must not be re-energized before a complete inspection.
- Keep protective housing tightly closed to prevent damage from condensation in the motor-drive unit.
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This quiz focuses on the operating instructions for the VACUTAP® VM® on-load tap-changer. Participants will learn about the functionality, features, and best practices for using this crucial equipment. Test your knowledge to ensure safe and effective operations.
