Technical Data on VACUTAP® Tap-Changer

Questions and Answers

What do Gas-to-liquid oils (GTL oils) represent in this context?

Synthetic oils

Petroleum products (correct)

Renewable energy sources

Natural gas derivatives

What should be verified when selecting an on-load tap-changer?

The environmental impact of usage

The maximum operational efficiency

The initial installation costs

The highest voltage stresses do not exceed rated withstand voltages (correct)

In the context of insulation distances, which configuration indicates more stress?

With coarse change-over selector in position -

With reversing change-over selector

With coarse change-over selector in position + (correct)

Without change-over selector

What is necessary to consider regarding permitted voltage stresses on the on-load tap-changer?

The insulation distances Signup and view all the answers

What aspect is related to the 'rated step voltage Uir' mentioned in capacity diagrams?

The voltage ratings for equipment operation Signup and view all the answers

What does the step capacity diagram illustrate for VACUTAP® VM and VM 300?

The rated step voltage and current ratings Signup and view all the answers

Which of the following is NOT a condition described for voltage stresses?

Highest stresses exceed rated withstand voltages Signup and view all the answers

What does the term 'permitted voltage stresses' specifically refer to?

The maximum voltages that insulation can handle Signup and view all the answers

What is the main subject of the document?

On-load tap-changer specifications and designations Signup and view all the answers

Which language were the original operating instructions written in?

German Signup and view all the answers

What is indicated by the statement 'all rights reserved' in the document?

Reproduction and dissemination require explicit permission Signup and view all the answers

What does the term 'on-load tap-changer' refer to in this context?

A component used to adjust voltage in transformers Signup and view all the answers

What right is reserved in the event of granting patents or utility models?

Changes to the design and scope of supply Signup and view all the answers

What is the customer's responsibility when using the specified product?

To ensure compatibility with their scope of application Signup and view all the answers

What aspect of the document indicates its intended exclusivity?

The clear mention of legal rights and permissions Signup and view all the answers

What might be a consequence of unauthorized reproduction of the document?

Legal liability and potential compensation claims Signup and view all the answers

What is the maximum number of operating positions for the VACUTAP® VM without a change-over selector?

18 Signup and view all the answers

Which selector size is not applicable with the VACUTAP® VM?

E Signup and view all the answers

What is the maximum temperature of the insulating fluid during normal operation of VACUTAP® VM?

+105 °C Signup and view all the answers

What is the transport temperature range for the VACUTAP® products?

-40 °C…+50 °C Signup and view all the answers

What is the compressive strength of the on-load tap-changer oil compartment?

0.3 bar Signup and view all the answers

How many equipped sectors does the VACUTAP® VMS® have?

3 Signup and view all the answers

What is the maximum number of operating positions for the VACUTAP® VM with a change-over selector?

35 Signup and view all the answers

Which dimension is mentioned in the mechanical data for the VACUTAP® products?

Dimensions Signup and view all the answers

When the transformer is in emergency operation, what is the maximum permitted temperature for the insulating fluid?

+115 °C Signup and view all the answers

Which VACUTAP® model has a selector size B and a maximum of 27 operating positions with a change-over selector?

VACUTAP® VM 300 Signup and view all the answers

What is the maximum operating voltage for the VACUTAP® VMS®?

170 kV Signup and view all the answers

Which type of tap-changers are applicable according to the content?

Single-phase on-load tap-changers Signup and view all the answers

For selector size C, what is the rated insulation level for AC?

82 Signup and view all the answers

What does the 'LI' stand for in the insulation distance table?

Lightning Impulse Signup and view all the answers

Which insulation type shows the highest value for selector size D?

LI Signup and view all the answers

What is the admissible maximum operating voltage for insulation distance 'a0' for size B?

150 Signup and view all the answers

How many times is the voltage for insulation distances 'a' compared to the values listed for AC?

Twice Signup and view all the answers

What is the value for the varistor response voltage at a lightning impulse?

45 kV Signup and view all the answers

For selector size DE, what is the insulation distance value for LI?

550 Signup and view all the answers

In the insulation distance table, which size has the lowest rating for SI?

B Signup and view all the answers

Which connection type corresponds to the designation 10050?

Connection without change-over selector Signup and view all the answers

What is the unique factor for connections marked with 'W' in their designation?

They belong to reversing change-over selectors. Signup and view all the answers

Which of the following designations corresponds to a connection with a coarse change-over selector?

12101G Signup and view all the answers

How many unique connections are there for the changing over selector labeled 12111G?

2 Signup and view all the answers

What is indicated by the presence of the 'G' designation in the context of VACUTAP connections?

It references connections with change-over selectors that have multiple mid-positions. Signup and view all the answers

What common feature do all connections identified under designation 10100 share?

They exist in the reversing change-over selector category. Signup and view all the answers

Which of the following options includes a connection that has more than three mid-positions?

12101G Signup and view all the answers

Which connection type is associated with the designation 14271W?

Connection with reversing change-over selector Signup and view all the answers

The original operating instructions for the product were written in French.

False Signup and view all the answers

The customer has no responsibility to ensure compatibility with their planned scope of application.

False Signup and view all the answers

The document allows for the reproduction and dissemination of its content with prior permission.

True Signup and view all the answers

The technical specifications of the product are based entirely on the manufacturer's information.

False Signup and view all the answers

The maximum number of operating positions for the VACUTAP® VM is greater than 30.

False Signup and view all the answers

The document reserves all rights in the event of damage claims related to the use of its content.

True Signup and view all the answers

The technical data presented in the document is final and will not change after publication.

False Signup and view all the answers

The designation system for on-load tap-changers includes numbers like 746224 and 10116560.

True Signup and view all the answers

The insulation distance f for a rated insulation level of 72.5 kV is 140 kV.

True Signup and view all the answers

The LI value for the rated insulation level of 245 kV is 1 150 kV.

False Signup and view all the answers

Insulation distance c2 is defined as the distance between change-over selector contacts of the same phase.

False Signup and view all the answers

For the insulation distance a, the maximum specified withstand voltage is important when exposed to impulse voltage.

True Signup and view all the answers

The AC value for the rated insulation level of 300 kV is 460 kV.

True Signup and view all the answers

The insulation distance b encompasses the contacts of different phases connected with the beginning and end of a tap winding.

True Signup and view all the answers

The SI value for the insulation level of 170 kV is 850 kV.

False Signup and view all the answers

The insulation distance a1 relates to tap selector contacts for different tap positions, regardless of connection.

False Signup and view all the answers

Gas-to-liquid oils (GTL oils) are classified as renewable energy sources.

False Signup and view all the answers

The rated step voltage Uir is related to both rated current and the type of tap-changer used.

True Signup and view all the answers

Permitted voltage stresses should exceed the rated withstand voltages for safety.

False Signup and view all the answers

Insulation distances vary significantly depending on whether a change-over selector is present.

True Signup and view all the answers

The maximum stress allowed under lightning impulse conditions is set at a specific insulation distance.

True Signup and view all the answers

A coarse change-over selector can only be positioned in the '+' position for optimal performance.

False Signup and view all the answers

The electrical arc furnace operation diagrams are unaffected by the load current specifications.

False Signup and view all the answers

The rated lightning impulse withstand voltage is a critical factor for electrical equipment insulation.

True Signup and view all the answers

Bridges on the selector connection contacts are optional for on-load tap-changers VACUTAP® VM I 802/1002.

False Signup and view all the answers

The connections listed under designation 12111W correspond to a change-over selector type that is not coarse.

False Signup and view all the answers

For current division, bridges are required only on the contacts of a single selector plane.

False Signup and view all the answers

The selector size with a maximum of 27 operating positions without a change-over selector is indicated by the designation 14140.

False Signup and view all the answers

The connections with designations ending in 'G' are associated exclusively with reversing change-over selectors.

False Signup and view all the answers

The insulation distance 'f' refers to the distance between the diverter switch output terminal and the ground.

True Signup and view all the answers

For selector size B, the insulation distance 'a0' has a maximum value of 20.

False Signup and view all the answers

The rated insulation level for AC for selector size C is 120.

True Signup and view all the answers

The minimum varistor response voltage at 1.2/50 µs lightning impulse is recorded as 45 kV.

False Signup and view all the answers

For insulation distance 'c2', the value relates to different phases that are unconnected.

True Signup and view all the answers

The selector sizes B and C have identical values for insulation distance 'd1'.

False Signup and view all the answers

Between connected and adjacent coarse tap contacts in one phase, the insulation distance is referred to as 'd2'.

True Signup and view all the answers

The insulation distance 'b' measures between the tap selector contacts of the same phase.

False Signup and view all the answers

The insulation distance 'c1' is greater than or equal to 400 for selector size C.

True Signup and view all the answers

The residual voltage at 3 kA peak withstand current for varistor response is listed as 66 kV.

False Signup and view all the answers

Study Notes

On-load Tap-Changer Overview

VACUTAP® VM®, VM 300, VMS® are on-load tap-changers used in transformers.
Designed for various applications, they allow adjustment of transformer output voltage without interrupting service.

Mechanical Data for VACUTAP Models

VACUTAP® VM
- Maximum operating positions: 18 (without change-over selector), 35 (with change-over selector), 107 (with multiple coarse change-over selector).
- Equipped sectors: 1 to 3.
VACUTAP® VM 300
- Maximum operating positions: 14 (without change-over selector), 27 (with change-over selector).
VACUTAP® VMS®
- Maximum operating positions: 18 (without change-over selector), 35 (with change-over selector).
- Equipped sectors: 3.

Ambient Conditions

Operational air temperature: -25 °C to +50 °C.
Insulating fluid temperature during operation: -25 °C to +105 °C (up to +115 °C in emergencies).
Transport and storage temperature: -40 °C to +50 °C.
Oil compartment is pressure-resistant to 0.3 bar (continuous differential pressure).

Step Capacity Diagrams

Step capacities are defined for network applications and electrical arc furnace operation for VACUTAP models.
Important for understanding rated step voltage (Uir) and current (Ir) capabilities.

Permitted Voltage Stresses

Voltage stresses must respect rated withstand voltages based on insulation distances.
Admissible operating voltage is defined as half the values for applied voltage (AC).

Insulation Levels and Selector Sizes

Rated insulation levels vary between models and include distinct performance metrics for insulation distance based on selector size (B, C, D, DE).
Admissible voltages are specified under various configurations, ensuring compatibility with system requirements.

Connections for VACUTAP® VMS® III and VM 300

Realizable connections for VACUTAP® VM 300 and VMS® III may involve varying configurations, accommodating change-over selectors and coarse tap options.

General Notes

Specifications are subject to change; technical data might differ from the initial document due to product alterations post-publication.
Customers must ensure product compatibility with their specific applications.

Introduction to VACUTAP® Tap-Changers

VACUTAP® is a range of on-load tap-changers designed for various applications, including network and electrical arc furnace operations.
Key designs include VACUTAP® VM, VM 300, and VMS®.

Technical Specifications

Document emphasizes strict protection of its content and intellectual property rights, including potential liabilities for infringement.
Ensure compatibility of the on-load tap-changer with specific customer applications.

Insulation and Voltage Stresses

Insulation distances are critical to ensure the rated withstand voltages aren’t exceeded during operations.
Different types of insulation levels are specified for various components of the tap-changer including diverter switches and selectors.

Step Capacity Diagrams

Diagrams outline the rated step voltage (Uir) and rated through-current (Ir) for network applications and arc furnace operations.
Detailed representations are crucial for assessing performance under different loads.

Permissible Ambient Conditions

Specific ambient conditions must be maintained to ensure optimal functioning of the on-load tap-changer.

Rated Insulation Levels

Ratings include:
- Lightning impulse (LI), Chopped wave lightning impulse (LIC), Switching impulse (SI), and Applied voltage (AC).
Each rated insulation level has its specified insulation distance, critical for ensuring safety and performance.

Realizable Connections

Detailed connections for VACUTAP® VMS® III are outlined for various configurations.
Specific requirements must be adhered to depending on the type of change-over selectors used.

Special Designs

Bridges may be required for the parallel connection of selector planes to ensure current distribution in multi-branch tap windings.

Conclusion

VACUTAP® tap-changers are engineered for reliability and performance under specified operating conditions, with careful attention to insulation ratings and connection configurations.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

This quiz explores the technical specifications and applications of the VACUTAP® VM, VM 300, and VMS® on-load tap-changers. Learn about the intricacies of these devices, their functioning principles, and essential data critical for understanding their role in electrical systems.