Tap Changer Mechanisms Overview

Questions and Answers

What is the purpose of the bevel gear in the tap changer assembly?

To provide electrical insulation.

To support the weight of the tap changer.

To control the speed of the motor.

To connect the tap changer head and the motor drive. (correct)

Which part requires a borehole of diameter 8.2 mm when preparing for installation?

Bevel gear

Guard plate

Horizontal driving shaft (correct)

Vertical driving shaft

What is indicated by the instruction to maintain a clearance of about 2 mm?

It ensures proper lubrication of the components.

It accommodates electrical connections.

It prevents mechanical obstruction between parts. (correct)

It allows for thermal expansion of the materials.

Which of the following components is NOT part of the standard version of the assembly?

Motor drive Signup and view all the answers

Why is it important to grease all O-rings during assembly?

To ensure a tight seal against fluids. Signup and view all the answers

What must be done with the guard plate according to the installation instructions?

Shorten it to the dimension z - 2. Signup and view all the answers

Which assembly step is specifically related to preventing corrosion?

Removing burrs from surfaces. Signup and view all the answers

What component secures the coupling bolt in the installation procedure?

Crown nut Signup and view all the answers

What is the primary function of the protective relay in the context provided?

To disconnect the transformer via circuit breakers during energization Signup and view all the answers

Which of the following is NOT mentioned as a necessary action for the protective relay?

Providing voltage stabilization Signup and view all the answers

What element connects the tap changer head and the protective relay?

Pipe connection Signup and view all the answers

Which of the following correctly describes the protective relay as per the content?

It should be connected to enable disconnection of the transformer. Signup and view all the answers

What is indicated by the dimensions mentioned in the document?

The physical size of the protective relay and its components Signup and view all the answers

In which setting should the protective relay be installed?

In proximity to the tap changer head and transformer Signup and view all the answers

What manufacturer is associated with the protective relay mentioned?

Gebrider Schavbeck KG Signup and view all the answers

What aspect of the protective relay's functionality is emphasized in the content?

Its capability to cut off power during faults Signup and view all the answers

What is the primary activity described in the document?

Drilling during assembly Signup and view all the answers

Which language is NOT represented in the document?

Spanish Signup and view all the answers

What component is specifically mentioned for driving shaft applications?

On-load gear changers Signup and view all the answers

What measurement unit is primarily used in the dimensions section of the document?

Millimeters Signup and view all the answers

Which of the following best describes the term 'Alberti comando' as used in the document?

Control shaft for gear changers under load Signup and view all the answers

In what context is 'bei Montage bohren' mentioned?

In the assembly process Signup and view all the answers

What does 'Maschinenfabrik' mean in the context of the document?

Machine factory Signup and view all the answers

Which part of the document mentions specifications related to drilling?

Assembly instructions Signup and view all the answers

Which component is described as having a sealed design?

Safety diaphragm Signup and view all the answers

What is the purpose of the connection facility for the protective relay RS 1000?

To facilitate control of the tap changer Signup and view all the answers

Which component is directly associated with the driving shaft?

Tap selector driving shaft Signup and view all the answers

What function does the air vent serve within the mounting flange?

To maintain atmospheric pressure Signup and view all the answers

Which of the following components is crucial for inspecting the internal status of the tap changer?

Inspection window Signup and view all the answers

What is indicated by the term 'output terminal of on-load tap changer'?

Connection for external load Signup and view all the answers

Which component primarily supports the operational mechanism of the tap changer?

Driving shaft Signup and view all the answers

What is the significance of the head gasket in this system?

It prevents leakage between components Signup and view all the answers

Which component is essential for the functionality of the safety diaphragm?

On-load tap changer head Signup and view all the answers

What role does the coupling play in this assembly?

It joins moving parts Signup and view all the answers

What is the exterior diameter specified in the document?

75.5 mm Signup and view all the answers

What is the thickness of the washer mentioned?

4 mm Signup and view all the answers

What diameter is specified for the lower lens head screw?

8 mm Signup and view all the answers

How is the three-part blind gland plate related to the cabinet?

It covers the aperture in the cabinet. Signup and view all the answers

What is the configuration of the fixing holes in the cabinet according to the document?

Circular arrangement Signup and view all the answers

What is the function of the aperture in the cabinet?

For cable entry Signup and view all the answers

Which component is indicated to be opened by 180 degrees?

Blind gland plate Signup and view all the answers

What is the implied relationship between the upper and lower mounting as described?

They are both integral to the gear mechanism. Signup and view all the answers

One tap change requires 25 revolutions of the driving shaft.

False Signup and view all the answers

The diverter switch oil tank is located above the tap changer head.

False Signup and view all the answers

A suction pipe is included by default in the tap changer assembly.

False Signup and view all the answers

The tap changer head contains a reduction gear and a spring-operated energy accumulator.

True Signup and view all the answers

The main function of the diverter switch is to effect a break in the current transfer.

False Signup and view all the answers

The tap selector selects the tap after the diverter switch executes the tap change.

False Signup and view all the answers

Residual gas escaping is managed through vent pipes located under the tap changer head.

True Signup and view all the answers

The protective relay RS 1000 is connected to the tap changer head via the oil conservator.

True Signup and view all the answers

The on-load tap changer type D III 200 can operate at a rated current of 600 A.

False Signup and view all the answers

A single-pole on-load tap changer is available with a rated current of 800 A.

True Signup and view all the answers

The On-Load Tap Changer Type D has an option for a changeover selector in both three-pole and single-pole configurations.

True Signup and view all the answers

The largest on-load tap changer described has a rated current of 1400 A.

False Signup and view all the answers

The document includes instructions for the assembly of the on-load tap changer exclusively for three-pole versions.

False Signup and view all the answers

The section regarding 'Drying Out the On-Load Tap Changer' is the last step in the assembly instructions.

False Signup and view all the answers

All versions of the on-load tap changer type D can be installed in a wye-connected tap winding arrangement.

False Signup and view all the answers

Preliminary testing is part of the installation process for the on-load tap changer.

True Signup and view all the answers

The bevel gear CD 6300-300 is specified to have a driving shaft for the on-load tap changer.

True Signup and view all the answers

The motor drive unit MA 4 has a dimension drawing number of N 1271.7 e.

True Signup and view all the answers

The protective relay is connected to the tap changer head using a wired connection only.

False Signup and view all the answers

The document indicates that a mounting flange is an example of a component that is not referenced in dimensioning.

False Signup and view all the answers

There is a requirement to maintain a clearance of 2 mm when installing the driving shafts.

False Signup and view all the answers

The driving shafts are directly associated with the MA 2 motor drive unit.

True Signup and view all the answers

The installation instructions specify the guard plate as a critical part to prevent corrosion.

False Signup and view all the answers

The term 'Maschinenfabrik' translates to 'machine factory' in English.

True Signup and view all the answers

The oil tank bottom is identified as component number 33.

False Signup and view all the answers

The driving shaft connects the on-load tap-changer head to the oil conservator.

False Signup and view all the answers

Component 48 serves as connecting leads for the tap selector and diverter switch.

True Signup and view all the answers

The safety diaphragm is listed as component number 16.

True Signup and view all the answers

The bevel gearing is identified as component number 72.

False Signup and view all the answers

The inspection window is designated as component number 15.

True Signup and view all the answers

The locking plate for blocking the Geneva drive is labeled as component 46.

False Signup and view all the answers

The output terminal of the on-load tap-changer is part of component 36.

True Signup and view all the answers

The purpose of the air vent is to relieve excess pressure within the transformer tank.

False Signup and view all the answers

The coupling mentioned is situated directly above the transformer cover.

False Signup and view all the answers

The on-load tap changer head gasket has a sealed design.

True Signup and view all the answers

The driving shaft is indirectly connected to the output terminal of the on-load tap changer.

False Signup and view all the answers

The connection facility for the protective relay RS 1000 is meant for drainage purposes.

False Signup and view all the answers

The safety diaphragm plays a crucial role in controlling oil flow within the diverter switch oil tank.

False Signup and view all the answers

The clearance requirement of about 2 mm is crucial to prevent interference between moving parts.

True Signup and view all the answers

The function of the air vent is to prevent expansion of oil in the oil tank.

True Signup and view all the answers

The couplings used in the assembly do not require any form of lubrication during installation.

False Signup and view all the answers

The protective relay RS 1000 is a mandatory component for all configurations of the tap changer.

False Signup and view all the answers

A hexagon cap screw is required alongside the driving shaft in the assembly.

True Signup and view all the answers

The inspection window is directly related to assessing the internal components of the diverter switch.

True Signup and view all the answers

Study Notes

Tap Changer Overview

Consider dimensions a1 and a2 as per version 1.15 during installation.
Includes driving shaft connecting tap changer head (100) to motor drive (111) via bevel gear (106).

Standard Version Components

Guard Plate (101): Protective element for tap changer.
Driving Shaft Options:
- Horizontal with flange coupling (102)
- Horizontal with sliding coupling (103, 104)
Fastenings (105): Includes coupling bolts, crown nuts, washers, and cotter pins.
Bevel Gear (106): Designated CD 6300-300, refer to Dimension Drawing N 1341.
Protective Tubes (107 & 108): Upper and lower tubes ensuring safety.

Mounting Instructions

Lubrication (5.21): Apply grease to O-rings on components (100, 104, 106, 107, 110, and 111).
Guard Plate Adjustment (5.22): Shorten to dimension z - 2.
Driving Shaft Preparation (5.23):
- Shorten shaft (102 or 103) to dimension L.
- Drill borehole of diameter 8.2 mm for coupling bolt (105).
- Maintain clearance of about 2 mm between the driving shaft and tap changer head/bevel gear.
Installation (5.24):
- Fit horizontal driving shaft, secure with coupling bolt, crown nut, and cotter pin.
- Install guard plate (101).

Electrical and Mechanical Connections

Protective relay RS 1000 is crucial for safety—must disconnect transformer if energized.
Clear documentation for connection facilities, ensuring proper assembly and functionality.

General Considerations

Regular lubrication and thorough inspection of components are vital for operational efficiency.
All components must follow precise measurements to ensure compatibility and safety during operation.

On-Load Tap Changer Type D - Overview

On-load tap changer Type D manufactured by Maschinenfabrik Reinhausen, designed for use in transformers.
Available variants: D III 200, D III 400, DI 400, DI 800, DI 1200, and configurations with three single-pole changers.

General Specifications

D III 200 offers three-pole operation, rated currents of 200 A or 400 A.
DI 400 features single-pole operation with rated current of 400 A.
DI 800 and DI 1200 have single-pole design with increasing rated currents of 800 A and 1200 A respectively.

Construction and Operation

Consists of diverter switch and tap selector; facilitates no-break transfer of current.
Diverter switch first selects the tap before executing the change.
Installed within transformer, utilizing reduction gears and spring-operated energy accumulators for operation.
Requires 33 revolutions of the driving shaft for each tap change.

Components

Tap changer head contains critical mechanical elements, including gears and connectors for external pipes leading to oil conservators or drains.
Diverter switch oil tank isolates transformer oil from the diverter switch oil, ensuring operational integrity.
Safety features include air vent pipes and inspection windows for monitoring functionality.

Assembly and Installation

Steps include preparation, installation into the transformer, and conducting preliminary tests.
Ensures appropriate connection to protective relay RS 1000, bevel gear assembly, and motor drive unit.
Final assembly stages confirm all connections and mechanical integrity before operation.

Operational Procedures

Involves trial switching operations to ensure correct functionality.
Guidelines for transporting the transformer and setting up on-site for operation.

Maintenance

Regular oil changes and revisions are necessary for optimal performance and longevity of the tap changer.

Additional Information

Installation drawings and dimension specifications available in appendices for reference.
Guidelines ensure correct assembly and functional specifications for various configurations of the on-load tap changer.

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Description

This quiz covers the components and dimensions of tap changers as outlined in version 1.15, focusing on the connection between the tap changer head and the motor drive. It will also examine related parts and their standard configurations. Test your understanding of these mechanical systems!