25 kV OHE Systems Overview

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Questions and Answers

What is the primary focus of the guidelines regarding structures in the vicinity of semaphore signals?

To increase the height of the signals.

To maintain adequate clearance from the signals. (correct)

To ensure visual clarity of the signals.

To enhance the aesthetic appeal of the structures.

Which speed category is specifically addressed for the setting of structures on curved tracks?

Speed 100 km/h.

Speed 200 km/h. (correct)

Speed 250 km/h.

Speed 150 km/h.

What type of arrangement is described for raising track structures in regulated systems?

Standard anchor arrangement.

Typical arrangement of structure assembly. (correct)

Typical cross-section arrangement.

Cantilever arrangement (Normal).

Which component is crucial for the electrical insulation in overhead equipment systems?

Insulators. Signup and view all the answers

What is the purpose of a neutral section in overhead equipment systems?

To prevent electrical shorts. Signup and view all the answers

In which setting is the arrangement of overhead equipment particularly important for enhanced safety?

In the vicinity of crowded platforms. Signup and view all the answers

What characteristic must conductors for 25 kV AC OHE possess?

High conductivity for efficient energy transmission. Signup and view all the answers

What is the distance in meters for structure number 3?

2.90 m Signup and view all the answers

Which structure has the maximum distance in meters?

Structure 2 Signup and view all the answers

What is the distance from the signal post for a setting value of 3.10 meters?

270 m Signup and view all the answers

Which setting value has the shortest distance from the signal post?

2.50 (Normal) Signup and view all the answers

How many structures have a distance of 2.75 meters?

3 Signup and view all the answers

What is the setting distance of the mast for a setting value of 2.90 meters?

45 m Signup and view all the answers

What is the distance from the signal post for a setting value of 2.75 meters?

115 m Signup and view all the answers

Which of the following structures has the same distance as structure number 7?

Structure 1 Signup and view all the answers

What is the setting value that corresponds with a distance from the signal post of 400 meters?

3.25 Signup and view all the answers

What components are included in the OHE system?

Catenary wire, contact wire, dropper, and supporting structures Signup and view all the answers

What is the setting distance of mast when the setting value is 3.50 meters?

70 meters Signup and view all the answers

In the dropper schedule for regulated OHE, which span corresponds to a dropper length D4 of 1280 mm?

67.50 meters Signup and view all the answers

At which setting value is the distance from the signal post the shortest?

3.50 meters Signup and view all the answers

Which of the following values is NOT part of the dropper lengths shown in the table?

1175 mm Signup and view all the answers

What is the distance from the signal post when the setting value is 2.90 meters?

225 meters Signup and view all the answers

What is the minimum span length mentioned for regulated OHE with equal encumbrance?

18 meters Signup and view all the answers

Which dropper number corresponds to a span of 40.50 meters?

5 Signup and view all the answers

How does the setting distance of mast change when increasing the setting value from 3.05 to 3.25 meters?

Increases by 15 meters Signup and view all the answers

Which setting value has both the distance from the signal post and the setting distance of mast at their maximum?

2.50 meters Signup and view all the answers

What pattern can be observed in the distances from the signal post as the setting value increases from 2.50 meters to 3.50 meters?

Increases then decreases Signup and view all the answers

Which setting value corresponds to a setting distance of mast of 45 meters?

2.75 meters Signup and view all the answers

How far is the distance from the signal post at the normal setting value of 2.50 meters?

130 meters Signup and view all the answers

What is the relationship between the setting distance of mast and the distance from the signal post across different setting values?

Setting distance varies independently from distance from signal post Signup and view all the answers

Which of the following setting values has a setting distance of mast less than 50 meters?

3.05 meters Signup and view all the answers

What is the required extra clearance for a structure at a height of 5410 mm above rail level with a degree of curvature of 3.0?

480 mm Signup and view all the answers

Which degree of curvature requires the least extra clearance from 840 mm to 4420 mm above rail level?

1.0 Signup and view all the answers

What is the extra clearance between adjacent tracks when there is no structure between tracks for a degree of curvature of 6.0?

300 mm Signup and view all the answers

At what degree of curvature is the extra clearance outside of curve for any height the highest?

5.0 Signup and view all the answers

For a radius of curvature of 291 m, what is the extra clearance for heights up to 840 mm?

110 mm Signup and view all the answers

What is the extra clearance from 840 mm to 4420 mm above rail level for a curvature degree of 1 1/20?

220 mm Signup and view all the answers

At a maximum speed of 106 km/h, which combination of clearance dimensions ensures safe operation for a curvature degree of 2.0?

100 mm and 590 mm Signup and view all the answers

What is the minimum extra clearance required at heights up to 840 mm for a curvature degree of 1/20?

130 mm Signup and view all the answers

Which height above rail level requires the greatest extra clearance for a curvature degree of 8.0?

5410 mm Signup and view all the answers

With a degree of curvature of 3/40, what is the extra clearance required outside the curve for any height?

7 mm Signup and view all the answers

What is the purpose of the dropper schedule for regulated OHE?

To specify the length and placement of droppers along the line Signup and view all the answers

In which section are the characteristics of conductors for the 25 kV AC OHE detailed?

Characteristics of conductor for 25 kV ac OHE Signup and view all the answers

Which structure arrangement is specifically designed for high-speed track operations?

Cantilever arrangement (High Speed) Signup and view all the answers

Which termination type is used for regulated OHE that utilizes a pulley block?

Termination of regulated OHE (Pulley block type) Signup and view all the answers

What aspect does the 'Cantilever arrangement (High Speed)' address?

Stability of overhead structures at high velocities Signup and view all the answers

Which setting is critical for safe operation near colour light signals with route indicators?

Setting of structures in the vicinity of colour light signals with route indicator. Signup and view all the answers

What is included in the standard anticreep arrangement within OHE systems?

Mechanisms to prevent track shifting Signup and view all the answers

What element is crucial for maintaining the vertical alignment of the OHE system structures?

Cross span wire Signup and view all the answers

Which type of foundation is appropriate for supporting an OHE mast in hard soil conditions?

Side bearing foundation (hard soil) Signup and view all the answers

In the context of OHE systems, what is the function of the turn buckle?

To adjust tension in the wire system Signup and view all the answers

Which structural component is indicated as supporting the contact wire in the OHE system?

Dropper Signup and view all the answers

What is the main consideration when determining the setting distance for OHE structures?

Rail level and curvature Signup and view all the answers

What is the maximum setting distance of mast for a setting value of 3.50 meters?

70 meters Signup and view all the answers

Which setting value corresponds to a distance from the signal post of 225 meters?

2.90 meters Signup and view all the answers

At which setting value does the distance from the signal post first exceed 300 meters?

3.25 meters Signup and view all the answers

What is the smallest setting distance of mast recorded across all setting values?

30 meters Signup and view all the answers

Which setting value has a distance from the signal post that is the closest to 250 meters?

3.05 meters Signup and view all the answers

For a setting value of 2.90 meters, what is the setting distance of the mast?

40 meters Signup and view all the answers

How does the distance from the signal post change as the setting value increases from 2.50 to 3.50 meters?

It increases for every setting value. Signup and view all the answers

What is the setting value that corresponds with a distance from the signal post of 130 meters?

2.50 meters Signup and view all the answers

Which of the following distances from the signal post is associated with the setting value of 3.50 meters?

70 meters Signup and view all the answers

What is the maximum span length detailed in the span and stagger chart?

5,750 meters Signup and view all the answers

What is the relationship between span length and radius of curvature as presented in the span and stagger chart?

Span length is directly proportional to radius of curvature. Signup and view all the answers

What is the maximum stagger value at a wind load of 75 kgf/m²?

240 mm Signup and view all the answers

What elements comprise the overhead equipment (OHE) system as shown in the schematic arrangement?

Catenary wire, contact wire, dropper, and supporting structures Signup and view all the answers

In the general clearance diagram for tangent and flat curves, what is depicted regarding clearances?

Both clearances between the OHE system and tracks, and OHE system and moving train Signup and view all the answers

What is the minimum stagger value mentioned in the span and stagger chart?

25 mm Signup and view all the answers

What type of jumper is shown in the schematic arrangement of regulated and unregulated OHE?

F jumper Signup and view all the answers

What additional structure is illustrated in the schematic for managing tension in the OHE system?

Guy rods Signup and view all the answers

What is the tension length approximated in the provided schematic for normal settings?

1800 m Signup and view all the answers

Which components make up the OHE system?

Catenary wire, contact wire, dropper, and supporting structures Signup and view all the answers

What is the maximum dropper length included in the dropper schedule for regulated OHE with equal encumbrance?

1370 mm Signup and view all the answers

In the dropper schedule for regulated OHE, what is the span corresponding to a dropper length D3 of 1044 mm?

63.00 m Signup and view all the answers

What is illustrated in the general clearance diagram for tangent and flat curves?

Clearances between the OHE system and track structures Signup and view all the answers

What is the shortest dropper length indicated in the dropper schedule for span lengths?

475 mm Signup and view all the answers

What is the range of spans covered in the dropper schedule for regulated OHE with equal encumbrance?

18.00 m to 72.00 m Signup and view all the answers

When the pantograph is lowered, which configuration is shown in the diagram?

Cross-section of track with the lowered OHE Signup and view all the answers

Which dropper number corresponds to a span of 49.50 meters?

6 Signup and view all the answers

For regulated OHE, how do the dropper lengths change as the span decreases?

They generally decrease Signup and view all the answers

Which of the following spans corresponds to a dropper length D4 of 1313 mm?

49.50 m Signup and view all the answers

Study Notes

25 kV OHE Diagrams of General Arrangement and Fittings

This document provides diagrams and details for 25 kV overhead line equipment (OHE) systems.
It contains content related to various aspects of OHE design and implementation.
Information is presented in sections, each covering a specific OHE component or arrangement.

Structure Settings: Details on setting structures around signals (semaphore and color light) with and without route indicators, as well as on curved tracks at different speeds.
Clearances: Provides diagrams defining clearance requirements for tangent and curved tracks for both regulated and unregulated OHE systems.
OHE Arrangements: Covers various arrangements, including on platforms, tangent tracks, and multiple-track sections. This includes cantilever arrangements for normal and high-speed scenarios.
Cross Sections: Diagrams of typical cross sections of two-track sections with anchor blocks are included.
Foundation and Support: Details on construction, overlaps (insulated and uninsulated), support arrangements (ceramic beaded neutral sections), and anchor arrangements are specified.
Terminations: Includes details on terminating regulated and unregulated OHE systems (different types of termination).
Arm Assemblies: Contains information on various components like standard sections, insulator assemblies, conductor characteristics, and standard jumper designs.
Headspan Arrangements: Drawings detail the general arrangement of headspans for OHE on four tracks.
Structures & Brackets: Describes how structures and bracket assemblies on tangent tracks are designed to accommodate track raising.

Diagrams and Specifications

The document includes various diagrams illustrating different OHE layouts, components, and terminations
Dimensions and specifications for various components are included in the diagrams.
Figures show detailed views of configurations.
The provided pages demonstrate various diagrams of different OHE components for different situations.

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Description

This quiz provides a comprehensive overview of 25 kV overhead line equipment (OHE) systems, including diagrams and specifications for various components. Each section elaborates on critical aspects such as structure settings, clearances, and arrangement types, essential for the implementation of OHE design. Dive into the details of OHE systems and test your understanding of their configurations.