VACUTAP® VRC/VRE Overview

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Questions and Answers

What is the purpose of the pipe connection Q in the VACUTAP® equipment?

It serves as a bypass for pressure regulation.

It connects to the tap selector for enhanced control.

It is closed with a blank cover. (correct)

It is used to facilitate oil flow to the on-load tap-changer head.

Which component in the VACUTAP® system is indicated as capable of being freely swiveled once the pressure ring is loosened?

On-load tap-changer head

Oil compartment

Change-over selector

Pipe bends (correct)

What is the primary risk associated with an unstably positioned selector?

It could damage the oil compartment's internal components.

It might block the selector's operational capabilities.

It can tip over, leading to injuries and property damage. (correct)

It may cause a power failure in the system.

How many pipe connections does the on-load tap-changer head feature for different purposes?

Four Signup and view all the answers

Which action must be taken before removing the red-colored packaging material from the selector?

Fix the selector to the oil compartment. Signup and view all the answers

What aspect of the pipe connections is mentioned in relation to their installation?

Some pipe connections are fitted with pipe bends ex factory. Signup and view all the answers

What happens once the blocking strip is removed from the selector coupling?

The selector coupling cannot be turned anymore. Signup and view all the answers

What is the role of the change-over selector in the VACUTAP® system?

To select different operating modes for the tap-changer. Signup and view all the answers

What is the maximum weight of the selector that should be considered when lifting?

270 kg Signup and view all the answers

What precaution should be taken to prevent collision damage between the selector and oil compartment?

Lift the selector carefully to avoid collision. Signup and view all the answers

What is the maximum height for stacking crates to prevent property damage?

1.5 m Signup and view all the answers

What visual indicator is used on sealed packaging of dried products?

Yellow label Signup and view all the answers

What should be ensured about the stacked crates in order to maintain the integrity of the packaged goods?

No parts should touch the loading surface. Signup and view all the answers

What component is added to the packaging to protect the goods from humidity?

Desiccant Signup and view all the answers

Which of the following is true about stacking crates?

Two equal-sized crates can be stacked on top of each other. Signup and view all the answers

What should be ensured while lifting the selector onto the oil compartment?

The tap-selector leads and potential connection unit should not touch the compartment. Signup and view all the answers

Which step is crucial before screwing the selector onto the oil compartment?

Aligning the position of coupling parts and attachment points correctly. Signup and view all the answers

What could be a potential consequence of incorrect tightening torques?

Damage to the on-load tap-changer. Signup and view all the answers

What is a major risk if the selector is unstably positioned during installation?

It may tip, leading to injuries or property damage. Signup and view all the answers

What is the recommended action after securing screw connections?

Snap the screening caps in place over the screw heads. Signup and view all the answers

What is the potential consequence of incorrect tightening torques in the assembly of the tap changer?

Damage to the on-load tap-changer Signup and view all the answers

Which action is necessary to ensure proper assembly of the tap-selector connections?

Secure screw connections and snap screening caps in place Signup and view all the answers

What should be carefully monitored to avoid damage during the mounting process?

The mechanical strain on the connecting leads Signup and view all the answers

What is indicated by the adjustment plans regarding the positioning of coupling parts?

The correct position is clearly outlined Signup and view all the answers

What is the first step outlined for preparation in the mounting process?

Screw selector onto oil compartment Signup and view all the answers

The VACUTAP® product is designed exclusively for use in hydraulic systems.

False Signup and view all the answers

Reading and observing the warnings in the technical file can help avoid function-related dangers.

True Signup and view all the answers

The technical file must be disregarded once the product is familiarized by the user.

False Signup and view all the answers

Improper use of the VACUTAP® product poses no risks to the user or the environment.

False Signup and view all the answers

For the VACUTAP® product, ensuring appropriate use eliminates any danger to people and property.

True Signup and view all the answers

Only use lubricants and auxiliary materials that are approved by the manufacturer.

True Signup and view all the answers

Modifications to the product can be performed without consulting Maschinenfabrik Reinhausen GmbH.

False Signup and view all the answers

The electrically skilled person must have no prior experience or knowledge before working on electrical systems.

False Signup and view all the answers

Spare parts approved by Maschinenfabrik Reinhausen GmbH are essential to prevent malfunctions.

True Signup and view all the answers

Personnel responsible for maintenance must be untrained individuals to avoid accidental risks.

False Signup and view all the answers

The sealed packaging includes a yellow label for all packaged goods, regardless of their condition.

False Signup and view all the answers

Crates should not be stacked higher than 1.5 m to prevent potential property damage.

True Signup and view all the answers

The desiccant is added after the plastic foil is bonded to the packaging.

False Signup and view all the answers

It is permissible to stack up to four equally sized crates on top of one another.

False Signup and view all the answers

Sealed packaging protects packaged goods from humidity without any additional components.

False Signup and view all the answers

The protective relay is activated when the flow of insulating fluid exceeds a certain speed due to a fault.

True Signup and view all the answers

Diverter switch operations at rated switching capacity will cause the protective relay to trip.

False Signup and view all the answers

The nameplate with the serial number is located on the transformer tank.

False Signup and view all the answers

An unstably positioned selector poses no risk of tipping over and causing injuries or property damage.

False Signup and view all the answers

It is required to remove the red protective cap on the 0-bar of the change-over selector before fixing the selector to the oil compartment.

False Signup and view all the answers

The flap valve in the protective relay system moves to the OFF position when a fault occurs.

True Signup and view all the answers

Removing the blocking strip from the selector coupling allows for unrestricted movement of the selector coupling.

False Signup and view all the answers

The pipe connection also serves to equalize the pressure in the oil compartment before transportation.

True Signup and view all the answers

Securing the selector on a level surface prior to installation is a necessary precaution to prevent tipping.

True Signup and view all the answers

The plastic bag with fastening materials is to be discarded before the mounting process begins.

False Signup and view all the answers

What is a potential consequence of operating outside of the permitted electrical conditions?

Injury to persons and damage to the product Signup and view all the answers

Which type of clothing poses a significant risk when working with electrical machines?

Loosely worn or unsuitable clothing Signup and view all the answers

What type of accident prevention measure is highlighted as crucial for personnel involved in operation and maintenance?

Using personal protective equipment Signup and view all the answers

What should personnel ensure when choosing personal protective gear for electrical work?

The gear is suitable and not damaged Signup and view all the answers

What can cause higher voltages due to transformer overexcitation?

Load shedding Signup and view all the answers

What measure should be taken to prevent accidents when wearing long hair around machinery?

Wear a hairnet Signup and view all the answers

Which of the following is not a prohibited operating condition?

Using personal protective equipment Signup and view all the answers

What should individuals responsible for maintaining electrical equipment ensure about their personal protective equipment?

It is worn correctly and in good condition Signup and view all the answers

What function can the pipe connection R serve in relation to the on-load tap-changer?

It is used exclusively for the attachment of the protective relay. Signup and view all the answers

What significant feature does the pipe connection S possess for operation?

It contains a vent screw and can be connected to a drain valve. Signup and view all the answers

Which of the following statements about pipe connection E2 is correct?

It is sealed with a blank cover and can connect to a collective pipe if necessary. Signup and view all the answers

How is the interchangeability of the functions between pipe connections R and Q indicated?

Both connections are labeled with the same designation. Signup and view all the answers

What safety measure can be implemented regarding the connection cables for the tap-change supervisory device?

They should be fed through the closed connections to reduce external exposure. Signup and view all the answers

Which action should be taken regarding pipe connection Q during the installation of the on-load tap-changer?

It needs to be covered with a blank cover if unused. Signup and view all the answers

What aspect of the pipe connection S enhances its functionality while maintaining safety?

Its ability to vent excess pressure without compromising connection integrity. Signup and view all the answers

In which way can the presence of a tap-change supervisory device influence the configuration of pipe connection Q?

It modifies the way the connection cables are routed through the pipe. Signup and view all the answers

What is a critical safety measure when commissioning a transformer to prevent explosions?

Ensuring no ignition sources are present Signup and view all the answers

Which of the following fluids should be used in the oil compartment of the on-load tap-changer to avoid damage?

Insulating fluids approved by the manufacturer Signup and view all the answers

What could be a consequence of operating the on-load tap-changer beyond its specified limits?

Increased likelihood of explosion Signup and view all the answers

Why is it important to fit a pressure relief device on the on-load tap-changer head if it has a flange?

To prevent potential damage to the tap-changer Signup and view all the answers

Which of the following is a risk associated with the improper filling of the oil compartment?

Damage due to unsuitable insulating fluids Signup and view all the answers

What is a precaution that should be taken regarding electrical devices during commissioning?

Only non-electrical tools should be used Signup and view all the answers

How can the risk of static charge build-up be managed in the vicinity of the transformer?

By using conductive and grounded hoses and equipment Signup and view all the answers

What is the consequence of neglecting to secure the selector on a level surface prior to installation?

Risk of tipping over and causing injuries Signup and view all the answers

What must be checked when the pressure relief device trips?

Both the on-load tap-changer and transformer must be checked. Signup and view all the answers

What is the appropriate action after activating the tap-change supervisory device?

The motor-drive unit should no longer be electrically actuated. Signup and view all the answers

Which action is crucial for re-commissioning a transformer after tripping the protective relay?

Contact the manufacturer and perform necessary measurements. Signup and view all the answers

What is the consequence of incorrectly tightening torques in the assembly of the tap changer?

It may lead to leaks or pressure inconsistencies. Signup and view all the answers

What should be done if the pressure monitoring device trips?

Contact the manufacturer and conduct necessary precautions for safe operation. Signup and view all the answers

Which safety measure must be adhered to regarding the motor-drive unit during maintenance?

The motor-drive unit should remain disconnected during servicing. Signup and view all the answers

What is critical to ensure before lifting the selector onto the oil compartment?

It must be checked that the selector is balanced and stable. Signup and view all the answers

Which guideline applies to the storage of crates to avoid damage?

Crates should be stacked no higher than 1.5 m. Signup and view all the answers

What should be confirmed before using the on-load tap-changer and transformer again after tripping?

There is certainty that no damage has occurred to the on-load tap-changer or transformer. Signup and view all the answers

Which piece of information is NOT required to be communicated to Maschinenfabrik Reinhausen after the relay has tripped?

The general cooling requirements of the surrounding area. Signup and view all the answers

What is the first step that should be taken if the pressure monitoring device trips?

Establish the time of tripping. Signup and view all the answers

What precaution should be taken before activating the transformer after a fault has been detected?

Verify that all monitoring devices are operational. Signup and view all the answers

Which factor is NOT considered during the re-commissioning of the transformer?

The type of lubricant used in the transformer. Signup and view all the answers

Which condition must be established before determining the next steps after a tripping incident?

The specific cause of the protective relay tripping is identified. Signup and view all the answers

What action immediately follows the determination of the time of tripping?

Detection of the operating position of the on-load tap-changer. Signup and view all the answers

What potential risk must be recognized when re-commissioning a transformer after a trip?

Insufficient testing may lead to severe injury or death. Signup and view all the answers

The pressure monitoring device activates the circuit breaker when the pressure decreases unexpectedly.

False Signup and view all the answers

Low-energy interference is sufficient to trip the pressure monitoring device.

False Signup and view all the answers

The pressure monitoring device is designed to respond slower than the protective relay.

False Signup and view all the answers

The tripping pressure of the pressure monitoring device can be adjusted after it is set at the factory.

False Signup and view all the answers

The sensor on the snap-action switch automatically resets after tripping.

False Signup and view all the answers

A corrugated tube is used as a barometer in the pressure monitoring device.

True Signup and view all the answers

The warning of dangerous electrical voltage is part of the product's safety markings.

True Signup and view all the answers

The pressure monitoring device is integral to the operation of the transformer, preventing underpressure conditions.

False Signup and view all the answers

The protective relay is functioning correctly when the flap valve is in the OFF position.

False Signup and view all the answers

Grounding is required on both high-voltage and low-voltage sides before testing the pressure monitoring device.

True Signup and view all the answers

The circuit breaker should remain closed during the testing of the protective relay.

False Signup and view all the answers

The sensor on the snap-action switch is in the OFF position when it is activated for testing.

False Signup and view all the answers

Removing the cover cap is the first step in checking the pressure monitoring device.

False Signup and view all the answers

The active protection test is conducted after ensuring the transformer’s circuit breaker is open.

True Signup and view all the answers

To reset the pressure monitoring device, the sensor needs to be activated again to return to the OFF position.

False Signup and view all the answers

During the checks, the automatic fire extinguishing device should remain activated.

False Signup and view all the answers

The inrush current impulses can be significantly less than the transformer rated current and will not jeopardize the on-load tap-changer during operation.

False Signup and view all the answers

The signaling contact for falling below the minimum insulating fluid fill level in the on-load tap-changer's oil conservator is not linked to the circuit breaker tripping circuit.

False Signup and view all the answers

It's safe to operate the motor-drive unit with the hand crank if the transformer is suspected to be faulty.

False Signup and view all the answers

All stop-cocks between the on-load tap-changer and oil conservator must be closed before switching on the transformer.

False Signup and view all the answers

The oil compartment of the on-load tap-changer should be empty before commissioning the transformer.

False Signup and view all the answers

It is permissible to use the hand crank to finish a tap-change operation that was initiated electrically.

False Signup and view all the answers

The protective relay is triggered when there is a deficiency in the flow of insulating fluid caused by a fault.

False Signup and view all the answers

Once the inrush current impulse has subsided, tap-change operations may be performed safely under any load conditions.

True Signup and view all the answers

The hand crank can be used for normal operation of the motor-drive unit at any time.

False Signup and view all the answers

It is permissible to operate the motor-drive unit with the hand crank if there is a detectable fault.

False Signup and view all the answers

An emergency operation is required when a tap-change operation is needed while the transformer is energized, despite a fault.

True Signup and view all the answers

The motor protective switch Q1 should be in position 1 before operating with the hand crank.

False Signup and view all the answers

It's acceptable to reverse the direction of rotation when using the hand crank.

False Signup and view all the answers

Contacting the Technical Service department is advisable if there are doubts about the motor-drive unit's functionality.

True Signup and view all the answers

The hand crank is required for operational checks after every tap-change operation regardless of other conditions.

False Signup and view all the answers

If unsure about the fault cause in the motor-drive unit, one should continue operating the unit to diagnose.

False Signup and view all the answers

The hand crank mounted in the motor-drive unit interrupts the control circuit during operation.

False Signup and view all the answers

Damage to the on-load tap-changer can occur if the tap-change operation is completed incorrectly.

True Signup and view all the answers

The protective relay must be tripped to energize the transformer without inspection.

False Signup and view all the answers

Explosive gases can deflagrate if ignition sources are present near the on-load tap-changer head cover.

True Signup and view all the answers

It is safe to operate electrical devices while removing the on-load tap-changer head cover.

False Signup and view all the answers

The pointer on the tap-change indicator should complete two full circles to indicate a completed tap-change operation.

False Signup and view all the answers

De-energizing all auxiliary circuits is not necessary before removing the on-load tap-changer head cover.

False Signup and view all the answers

The hand crank should be positioned in the area marked in green on the tap-change indicator for proper operation.

False Signup and view all the answers

Study Notes

VACUTAP® VRC/VRE

On-load tap-changer head enables voltage regulation without disconnection.
Tap selector allows for changing taps to adjust output voltage.
Oil compartment provides insulation and cooling for electrical components.
Change-over selector facilitates selection between different operational modes.

VACUTAP® VRD/VRF

Features include an on-load tap-changer head, tap selector, oil compartment, and change-over selector.
Pipe connections in the on-load tap-changer head serve various functional purposes.

VACUTAP® VRG

Incorporates the same components as previous models: on-load tap-changer head, tap selector, oil compartment, change-over selector.
Supports versatility in operational configurations.

Pipe Connections

Four pipe connections available on the on-load tap-changer head.
Pipe bends may be fitted from the factory and are adjustable once pressure rings are loosened.
Pipe connection Q is closed with a blank cover to maintain system integrity.
Sealed packaging with plastic wrap protects products from humidity and physical damage.

Packaging and Handling

Crates marked for proper stacking; do not exceed 1.5 meters height.
Only two identical-sized crates should be stacked.
Movement of packages should follow local transportation regulations to ensure product safety.

Mounting Procedures

Care must be taken to stabilize the selector during mounting to prevent tipping.
Remove protective packaging only after securing the selector to the oil compartment.
Selector weight can reach up to 270 kg; lifting requires caution to avoid collisions with other components.
Correct alignment and torque specifications are crucial during the assembly to prevent damage.
The presence of support components must be noted and removed to facilitate secure connections.

General Notices

Incorrect stacking can cause product damage; always follow outer markings on packaging.
Careful handling during lifting and installation is essential to avoid mechanical strain on the equipment.
Secure all screw connections properly and use screening caps as necessary to cover connection points.

Multi-Step Instructions

Instructions consist of multiple process steps with an aim, requirements, and results linked to each step.

Safety Guidelines

Familiarize yourself with the technical file and comply with safety instructions to avoid hazards.
Risks of life and damage can arise from improper use; the device should only be used in accordance with specified guidelines.
Use only manufacturer-approved lubricants and auxiliary materials; unauthorized modifications can lead to injuries and operational faults.

Appropriate Use

The VACUTAP® VR® is an on-load tap-changer designed to adjust the transmission ratio of transformers without interrupting the load flow.
Compliant use ensures no danger to people, property, or the environment.

Personnel Qualifications

Assembly, commissioning, and maintenance must be performed by electrically skilled personnel with proper qualifications and knowledge of applicable standards.

Device Features

A pressure-equalizing pipe connection is necessary for transformer maintenance, including drying and filling with insulating fluid.
The nameplate on the tap-changer head cover includes the serial number for identification.

Protective Devices

The protective relay is integrated into the circuit breaker tripping circuit and trips when flow speed exceeds safe limits, automatically de-energizing the transformer.
The protective relay conforms to IEC publication 60214-1 standards.

Packaging and Transport Precautions

Packages should not be stacked over 1.5 meters, with specific instructions for upright packaging.
Sturdy crates and sealed plastic packaging protect the goods from humidity and physical deterioration during transport.

Mounting Instructions

Ensure the tap selector is securely positioned to avoid tipping and potential injuries.
Remove protective packaging only after proper securing of components, and manage assembly materials carefully to maintain stability during installation.

Prohibited Electrical Operating Conditions

Compliance with design data in order confirmation is mandatory to avoid prohibited operating conditions.
Prohibited conditions can be caused by short circuits or inrush current when energizing transformers or electrical machines.
Higher voltages may occur due to transformer overexcitation, especially after load shedding.
Operations outside permitted conditions can result in personal injury and product damage; preventive measures must be taken.

Fundamental Safety Instructions

Those involved in transport, installation, operation, maintenance, and disposal of the product must adhere to safety protocols.
Wear appropriate personal protective equipment to prevent accidents and injuries.
Avoid loose or unsuitable clothing that could get caught in moving parts; jewelry should not be worn.
Long hair must be secured to avoid entanglement in machinery.

Product Description and Pipe Connections

Some pipe connections come designed with pipe bends from the factory for flexibility in installation.
Pipe connection Q includes a sealed cover; it is interchangeable with connection R for tap-change supervisory device cables.
Pipe connection S features a vent screw and facilitates draining oil when connected to a transformer drain valve.
Pipe connection E2 connects to the oil tank beneath the tap-changer head and can link to a collective pipe for the Buchholz relay.
Caution is required to prevent explosions from explosive gases in the oil compartment and surrounding areas.

Commissioning the Transformer

Unsuitable insulating fluids can damage the on-load tap-changer; only approved fluids should be used.
Check if the on-load tap-changer head cover accommodates a pressure relief device; it must be installed to prevent damage.

Fault Elimination Procedures

Tripping of protective relays and pressure devices indicates potential equipment issues requiring immediate inspection.
Monitor conditions, load status, and any operational changes at the time of tripping to diagnose causes.
Re-commissioning involves checking the protective relay and ensuring the transformer is ready for operation.
If pressure monitoring devices trip, assess the system for damage and contact service for thorough checks before reuse.

Safety Warnings

Underestimating tests on the on-load tap-changer can cause severe injury or death; professional advice is critical after tripping events.
Ensure no physical or operational damage to the transformer and on-load tap-changer before restarting operations.

Safety Markings

Protective conductor connection, warning of dangerous electrical voltage, and the importance of reading the documentation for safety compliance.

Pressure Monitoring Device DW

The DW 2000 device safeguards the on-load tap-changer against impermissible pressure increases.
Located externally on the on-load tap-changer, it activates upon detecting static and dynamic pressures in the oil compartment.
Utilizes a corrugated tube and spring mechanism linked to a snap-action switch sensor.
A pressure increase triggers the sensor to switch to the OFF position, de-energizing the transformer.

Tripping Mechanism

The pressure monitoring device is factory-set, preventing accidental changes to the tripping pressure.
Responds to rapid pressure increases more quickly than the standard protective relay of the MR protection system.

Protective Relay (RS 2004) Inspection

Verify functionality before transformer commissioning by checking the flap valve position and ensuring the transformer is grounded.
Test procedure includes pressing the OFF button and checking that the circuit breaker remains open for active protection validation.

Pressure Monitoring Device Testing

Proper grounding and de-energization are essential before sensor activation to confirm the OFF position.
Follow a step-by-step testing process to ensure the sensor functions correctly before commissioning the transformer.

Transformer Commissioning

Ensure the oil compartment is fully filled and all stop-cocks are open.
Signaling contact for low insulating fluid level must be integrated into the circuit breaker's tripping circuit.
Caution against inrush current exceeding rated current during tap-change operations.

Operating the Motor-Drive Unit

Unauthorized use of the hand crank poses severe explosion risks; it requires disconnecting the transformer first.
Hand crank operation is primarily for installation and maintenance, not normal operation.

Tap-Change Operation with Hand Crank

Precise steps include switching off the motor protective switch and fully turning the hand crank.
Ensure pointer returns to the mid-position on the tap-change indicator before concluding the operation.

Fault Elimination Precautions

Potential explosive hazards exist under the on-load tap-changer cover; ensure absence of ignition sources.
Auxiliary circuits must be de-energized before cover removal to prevent sparks or deflagration.
Inspect the on-load tap-changer and transformer if protective devices trip to avoid further damage.

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Description

This quiz covers the key features and components of the VACUTAP® VRC/VRE tap changer, including the on-load tap-changer head and oil compartment. It provides an opportunity to understand the mechanical parts involved and their functions. Perfect for engineering students and professionals keen on electrical device operations.