Podcast
Questions and Answers
What is the primary focus of the guidelines regarding structures in the vicinity of semaphore signals?
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?
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?
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?
Which component is crucial for the electrical insulation in overhead equipment systems?
What is the purpose of a neutral section in overhead equipment systems?
What is the purpose of a neutral section in overhead equipment systems?
In which setting is the arrangement of overhead equipment particularly important for enhanced safety?
In which setting is the arrangement of overhead equipment particularly important for enhanced safety?
What characteristic must conductors for 25 kV AC OHE possess?
What characteristic must conductors for 25 kV AC OHE possess?
What is the distance in meters for structure number 3?
What is the distance in meters for structure number 3?
Which structure has the maximum distance in meters?
Which structure has the maximum distance in meters?
What is the distance from the signal post for a setting value of 3.10 meters?
What is the distance from the signal post for a setting value of 3.10 meters?
Which setting value has the shortest distance from the signal post?
Which setting value has the shortest distance from the signal post?
How many structures have a distance of 2.75 meters?
How many structures have a distance of 2.75 meters?
What is the setting distance of the mast for a setting value of 2.90 meters?
What is the setting distance of the mast for a setting value of 2.90 meters?
What is the distance from the signal post for a setting value of 2.75 meters?
What is the distance from the signal post for a setting value of 2.75 meters?
Which of the following structures has the same distance as structure number 7?
Which of the following structures has the same distance as structure number 7?
What is the setting value that corresponds with a distance from the signal post of 400 meters?
What is the setting value that corresponds with a distance from the signal post of 400 meters?
What components are included in the OHE system?
What components are included in the OHE system?
What is the setting distance of mast when the setting value is 3.50 meters?
What is the setting distance of mast when the setting value is 3.50 meters?
In the dropper schedule for regulated OHE, which span corresponds to a dropper length D4 of 1280 mm?
In the dropper schedule for regulated OHE, which span corresponds to a dropper length D4 of 1280 mm?
At which setting value is the distance from the signal post the shortest?
At which setting value is the distance from the signal post the shortest?
Which of the following values is NOT part of the dropper lengths shown in the table?
Which of the following values is NOT part of the dropper lengths shown in the table?
What is the distance from the signal post when the setting value is 2.90 meters?
What is the distance from the signal post when the setting value is 2.90 meters?
What is the minimum span length mentioned for regulated OHE with equal encumbrance?
What is the minimum span length mentioned for regulated OHE with equal encumbrance?
Which dropper number corresponds to a span of 40.50 meters?
Which dropper number corresponds to a span of 40.50 meters?
How does the setting distance of mast change when increasing the setting value from 3.05 to 3.25 meters?
How does the setting distance of mast change when increasing the setting value from 3.05 to 3.25 meters?
Which setting value has both the distance from the signal post and the setting distance of mast at their maximum?
Which setting value has both the distance from the signal post and the setting distance of mast at their maximum?
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?
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?
Which setting value corresponds to a setting distance of mast of 45 meters?
Which setting value corresponds to a setting distance of mast of 45 meters?
How far is the distance from the signal post at the normal setting value of 2.50 meters?
How far is the distance from the signal post at the normal setting value of 2.50 meters?
What is the relationship between the setting distance of mast and the distance from the signal post across different setting values?
What is the relationship between the setting distance of mast and the distance from the signal post across different setting values?
Which of the following setting values has a setting distance of mast less than 50 meters?
Which of the following setting values has a setting distance of mast less than 50 meters?
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?
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?
Which degree of curvature requires the least extra clearance from 840 mm to 4420 mm above rail level?
Which degree of curvature requires the least extra clearance from 840 mm to 4420 mm above rail level?
What is the extra clearance between adjacent tracks when there is no structure between tracks for a degree of curvature of 6.0?
What is the extra clearance between adjacent tracks when there is no structure between tracks for a degree of curvature of 6.0?
At what degree of curvature is the extra clearance outside of curve for any height the highest?
At what degree of curvature is the extra clearance outside of curve for any height the highest?
For a radius of curvature of 291 m, what is the extra clearance for heights up to 840 mm?
For a radius of curvature of 291 m, what is the extra clearance for heights up to 840 mm?
What is the extra clearance from 840 mm to 4420 mm above rail level for a curvature degree of 1 1/20?
What is the extra clearance from 840 mm to 4420 mm above rail level for a curvature degree of 1 1/20?
At a maximum speed of 106 km/h, which combination of clearance dimensions ensures safe operation for a curvature degree of 2.0?
At a maximum speed of 106 km/h, which combination of clearance dimensions ensures safe operation for a curvature degree of 2.0?
What is the minimum extra clearance required at heights up to 840 mm for a curvature degree of 1/20?
What is the minimum extra clearance required at heights up to 840 mm for a curvature degree of 1/20?
Which height above rail level requires the greatest extra clearance for a curvature degree of 8.0?
Which height above rail level requires the greatest extra clearance for a curvature degree of 8.0?
With a degree of curvature of 3/40, what is the extra clearance required outside the curve for any height?
With a degree of curvature of 3/40, what is the extra clearance required outside the curve for any height?
What is the purpose of the dropper schedule for regulated OHE?
What is the purpose of the dropper schedule for regulated OHE?
In which section are the characteristics of conductors for the 25 kV AC OHE detailed?
In which section are the characteristics of conductors for the 25 kV AC OHE detailed?
Which structure arrangement is specifically designed for high-speed track operations?
Which structure arrangement is specifically designed for high-speed track operations?
Which termination type is used for regulated OHE that utilizes a pulley block?
Which termination type is used for regulated OHE that utilizes a pulley block?
What aspect does the 'Cantilever arrangement (High Speed)' address?
What aspect does the 'Cantilever arrangement (High Speed)' address?
Which setting is critical for safe operation near colour light signals with route indicators?
Which setting is critical for safe operation near colour light signals with route indicators?
What is included in the standard anticreep arrangement within OHE systems?
What is included in the standard anticreep arrangement within OHE systems?
What element is crucial for maintaining the vertical alignment of the OHE system structures?
What element is crucial for maintaining the vertical alignment of the OHE system structures?
Which type of foundation is appropriate for supporting an OHE mast in hard soil conditions?
Which type of foundation is appropriate for supporting an OHE mast in hard soil conditions?
In the context of OHE systems, what is the function of the turn buckle?
In the context of OHE systems, what is the function of the turn buckle?
Which structural component is indicated as supporting the contact wire in the OHE system?
Which structural component is indicated as supporting the contact wire in the OHE system?
What is the main consideration when determining the setting distance for OHE structures?
What is the main consideration when determining the setting distance for OHE structures?
What is the maximum setting distance of mast for a setting value of 3.50 meters?
What is the maximum setting distance of mast for a setting value of 3.50 meters?
Which setting value corresponds to a distance from the signal post of 225 meters?
Which setting value corresponds to a distance from the signal post of 225 meters?
At which setting value does the distance from the signal post first exceed 300 meters?
At which setting value does the distance from the signal post first exceed 300 meters?
What is the smallest setting distance of mast recorded across all setting values?
What is the smallest setting distance of mast recorded across all setting values?
Which setting value has a distance from the signal post that is the closest to 250 meters?
Which setting value has a distance from the signal post that is the closest to 250 meters?
For a setting value of 2.90 meters, what is the setting distance of the mast?
For a setting value of 2.90 meters, what is the setting distance of the mast?
How does the distance from the signal post change as the setting value increases from 2.50 to 3.50 meters?
How does the distance from the signal post change as the setting value increases from 2.50 to 3.50 meters?
What is the setting value that corresponds with a distance from the signal post of 130 meters?
What is the setting value that corresponds with a distance from the signal post of 130 meters?
Which of the following distances from the signal post is associated with the setting value of 3.50 meters?
Which of the following distances from the signal post is associated with the setting value of 3.50 meters?
What is the maximum span length detailed in the span and stagger chart?
What is the maximum span length detailed in the span and stagger chart?
What is the relationship between span length and radius of curvature as presented in the span and stagger chart?
What is the relationship between span length and radius of curvature as presented in the span and stagger chart?
What is the maximum stagger value at a wind load of 75 kgf/m²?
What is the maximum stagger value at a wind load of 75 kgf/m²?
What elements comprise the overhead equipment (OHE) system as shown in the schematic arrangement?
What elements comprise the overhead equipment (OHE) system as shown in the schematic arrangement?
In the general clearance diagram for tangent and flat curves, what is depicted regarding clearances?
In the general clearance diagram for tangent and flat curves, what is depicted regarding clearances?
What is the minimum stagger value mentioned in the span and stagger chart?
What is the minimum stagger value mentioned in the span and stagger chart?
What type of jumper is shown in the schematic arrangement of regulated and unregulated OHE?
What type of jumper is shown in the schematic arrangement of regulated and unregulated OHE?
What additional structure is illustrated in the schematic for managing tension in the OHE system?
What additional structure is illustrated in the schematic for managing tension in the OHE system?
What is the tension length approximated in the provided schematic for normal settings?
What is the tension length approximated in the provided schematic for normal settings?
Which components make up the OHE system?
Which components make up the OHE system?
What is the maximum dropper length included in the dropper schedule for regulated OHE with equal encumbrance?
What is the maximum dropper length included in the dropper schedule for regulated OHE with equal encumbrance?
In the dropper schedule for regulated OHE, what is the span corresponding to a dropper length D3 of 1044 mm?
In the dropper schedule for regulated OHE, what is the span corresponding to a dropper length D3 of 1044 mm?
What is illustrated in the general clearance diagram for tangent and flat curves?
What is illustrated in the general clearance diagram for tangent and flat curves?
What is the shortest dropper length indicated in the dropper schedule for span lengths?
What is the shortest dropper length indicated in the dropper schedule for span lengths?
What is the range of spans covered in the dropper schedule for regulated OHE with equal encumbrance?
What is the range of spans covered in the dropper schedule for regulated OHE with equal encumbrance?
When the pantograph is lowered, which configuration is shown in the diagram?
When the pantograph is lowered, which configuration is shown in the diagram?
Which dropper number corresponds to a span of 49.50 meters?
Which dropper number corresponds to a span of 49.50 meters?
For regulated OHE, how do the dropper lengths change as the span decreases?
For regulated OHE, how do the dropper lengths change as the span decreases?
Which of the following spans corresponds to a dropper length D4 of 1313 mm?
Which of the following spans corresponds to a dropper length D4 of 1313 mm?
Flashcards
25 kV OHE Diagrams
25 kV OHE Diagrams
Visual representations of overhead line equipment (OHE) arrangements and components, issued by RDSO (Railway Board).
Semaphore Signals
Semaphore Signals
A type of railway signal using a mechanical arm to indicate a command.
Color Light Signals
Color Light Signals
Railway signals that use colored lights to indicate commands.
Route Indicator
Route Indicator
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Curved Track
Curved Track
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Overhead Line Equipment (OHE)
Overhead Line Equipment (OHE)
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Regulated OHE
Regulated OHE
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Unregulated OHE
Unregulated OHE
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Span and Stagger Chart
Span and Stagger Chart
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Dropper Schedule
Dropper Schedule
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General Clearance Diagram
General Clearance Diagram
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Setting Value (Meters)
Setting Value (Meters)
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Setting Distance of Mast (Meters)
Setting Distance of Mast (Meters)
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Distance from Signal Post (Meters)
Distance from Signal Post (Meters)
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2.50 (Normal) Setting Value
2.50 (Normal) Setting Value
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200 km/h Max Speed
200 km/h Max Speed
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Extra Clearance (mm)
Extra Clearance (mm)
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Degree of Curvature
Degree of Curvature
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Radius of Curvature
Radius of Curvature
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Setting Distance of Structure 7
Setting Distance of Structure 7
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Setting Distance of Structure 6
Setting Distance of Structure 6
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Setting Distance of Structure 5
Setting Distance of Structure 5
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Setting Distance of Structure 4
Setting Distance of Structure 4
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Setting Distance of Structure 3
Setting Distance of Structure 3
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Setting Distance of Structure 2
Setting Distance of Structure 2
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Setting Distance of Structure 1
Setting Distance of Structure 1
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Setting Distance of Mast (2.50m)
Setting Distance of Mast (2.50m)
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Setting Distance of Mast (2.75m)
Setting Distance of Mast (2.75m)
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Setting Value 2.90 meters
Setting Value 2.90 meters
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Setting Value 3.05 meters
Setting Value 3.05 meters
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Extra clearance (mm)
Extra clearance (mm)
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Degree of Curvature
Degree of Curvature
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Radius of Curvature (m)
Radius of Curvature (m)
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Height above rail level (mm)
Height above rail level (mm)
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Extra clearance for outside curve (mm)
Extra clearance for outside curve (mm)
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Extra clearance between adjacent tracks (mm)
Extra clearance between adjacent tracks (mm)
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1/20 degree of curvature
1/20 degree of curvature
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Maximum speed (km/h)
Maximum speed (km/h)
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OHE System Components
OHE System Components
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OHE Clearances
OHE Clearances
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Overlap Spans
Overlap Spans
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Dropper Schedule
Dropper Schedule
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Span
Span
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Dropper Number
Dropper Number
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Dropper Length
Dropper Length
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Setting of structures near semaphore signals
Setting of structures near semaphore signals
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Setting of structures near color light signals (no route indicator)
Setting of structures near color light signals (no route indicator)
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Setting of structures near color light signals (with route indicator)
Setting of structures near color light signals (with route indicator)
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OHE setting on curved track (200 km/h)
OHE setting on curved track (200 km/h)
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OHE setting on curved track (105 km/h)
OHE setting on curved track (105 km/h)
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General clearance diagram (tangent and flat curves, regulated)
General clearance diagram (tangent and flat curves, regulated)
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Dropper schedule (regulated OHE, equal encumbrance)
Dropper schedule (regulated OHE, equal encumbrance)
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Span and stagger chart
Span and stagger chart
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General clearance diagram (tangent and flat curves, unregulated)
General clearance diagram (tangent and flat curves, unregulated)
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Schematic arrangement (regulated and unregulated OHE)
Schematic arrangement (regulated and unregulated OHE)
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Type of OHE
Type of OHE
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OHE arrangement on platforms
OHE arrangement on platforms
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OHE arrangement on tangent track
OHE arrangement on tangent track
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Setting Value (Meters)
Setting Value (Meters)
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Setting Distance of Mast (Meters)
Setting Distance of Mast (Meters)
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Distance from Signal Post (Meters)
Distance from Signal Post (Meters)
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2.50 (Normal) Setting Value
2.50 (Normal) Setting Value
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200 km/h Max Speed
200 km/h Max Speed
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Setting Value 2.75 meters
Setting Value 2.75 meters
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Setting Value 2.90 meters
Setting Value 2.90 meters
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Setting Value 3.05 meters
Setting Value 3.05 meters
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Setting Value 3.25 meters
Setting Value 3.25 meters
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Setting Value 3.50 meters
Setting Value 3.50 meters
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OHE system components
OHE system components
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Dropper Schedule
Dropper Schedule
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Span (OHE)
Span (OHE)
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Dropper Number (OHE)
Dropper Number (OHE)
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Dropper Length (OHE)
Dropper Length (OHE)
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Regulated OHE
Regulated OHE
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Overlap Spans (OHE)
Overlap Spans (OHE)
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General Clearance Diagram
General Clearance Diagram
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Span and Stagger Chart
Span and Stagger Chart
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Catenary Stagger
Catenary Stagger
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Radius of Curvature (m)
Radius of Curvature (m)
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Max Span (m)
Max Span (m)
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WIND LOAD (kg/m²)
WIND LOAD (kg/m²)
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Contact Wire Stagger (mm)
Contact Wire Stagger (mm)
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Max permissive mid span stagger
Max permissive mid span stagger
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General Clearance Diagram (Tangent & Flat Curves, Unregulated OHE)
General Clearance Diagram (Tangent & Flat Curves, Unregulated OHE)
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Schematic Arrangement of Regulated & Unregulated OHE
Schematic Arrangement of Regulated & Unregulated OHE
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"F" Jumper
"F" Jumper
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In Span Jumper
In Span Jumper
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Span
Span
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Max permissible mid span stagger (75 kgf/m²)
Max permissible mid span stagger (75 kgf/m²)
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Max permissible mid span stagger (112.5 kgf/m²)
Max permissible mid span stagger (112.5 kgf/m²)
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Tension Length (Approx)
Tension Length (Approx)
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Contact Plane
Contact Plane
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Erection Schedule of Bracket Assembly
Erection Schedule of Bracket Assembly
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Typical Structure Erection Drawing
Typical Structure Erection Drawing
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Rail Level
Rail Level
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OHE Headspan (4 tracks)
OHE Headspan (4 tracks)
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Cross Span Wire
Cross Span Wire
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Headspan Dropper
Headspan Dropper
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9-tonne Insulator
9-tonne Insulator
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Turnbuckle
Turnbuckle
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Setting Distance
Setting Distance
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Style-02
Style-02
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Erection Schedule of Bracket Assembly for Unregulated OHE
Erection Schedule of Bracket Assembly for Unregulated OHE
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Side Bearing Foundation
Side Bearing Foundation
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Side Gravity Foundation
Side Gravity Foundation
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Foundation on Black Cotton Soil
Foundation on Black Cotton Soil
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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.
Contents
- 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.
