Layout & understanding of Feeding Post |Sectioning & Sub Sectioning Post| |Elementary Post|

Summary

This video lecture delves into the intricacies of a feeding post in a traction power supply system. It explains the setup of overhead catenary systems and the role of substations in providing power. The lecture covers various components like feeding posts, sectioning posts, and parallel posts, emphasizing their importance in maintaining a balanced power supply. It also discusses the use of neutral sections to prevent unbalanced loads and the role of elementary sections in isolating faults for maintenance. The video concludes with insights on auxiliary equipment used for remote control and protection.

Takeaways

• 🚋 The video lecture discusses the components of a traction power supply system, specifically focusing on the feeding post, substation, and various types of posts used in railway electrification.
• 🔌 Feeding posts are crucial as they receive power from the substation and distribute it to the overhead catenary system for train traction.
• 🏭 Substations are the primary source of power, supplying 25 kV feeders to the feeding posts, which are typically located about two kilometers away.
• 🔄 The feeding post layout includes two incoming 25 kV feeders, each with two conductors for connection to the bus bar and track for return current.
• 🛠️ Remote control is commonly used for feeding posts, which are equipped with circuit breakers and bus couplers to connect the bus bars.
• 🚆 To maintain balance, adjacent substations are fed with different phases, and a neutral section is provided between them to allow trains to change phases.
• 🔄 Sectioning and parallel posts are used for emergency supply in case of interruptions in the incoming 25 kV feeders.
• 🛑 Elementary sections are created to ensure rapid isolation of overhead equipment and maintenance work, with a distance of 10 to 15 kilometers between them.
• ⚡ Auxiliary equipment at control posts includes lightning arresters, auxiliary transformers, potential transformers, and circuitry for remote control and monitoring.
• 🔋 Battery and battery charging equipment are essential for the operation of remote control equipment at the posts.
• 🛂 Insulated overlapped bridges with isolators are used to separate nearby elementary sections, and these sections are manually operated on no load.

Q & A

What is the primary purpose of a feeding post in an overhead catenary system?

The primary purpose of a feeding post is to supply power from the substation to the overhead catenary system at a certain distance, ensuring the power supply for traction.

How far is a typical feeding post located from the substation?

A typical feeding post is normally capped at two kilometers away from the substation.

What are the two main components that come from the substation to the feeder post?

The two main components are the two incoming 25 kV feeders, each with a two-conductor system for connection to the bus bar and the track.

What is the role of interrupters in the feeding post?

Interrupters are used in the feeding post as circuit breakers without protective relays to manage the flow of power in the system.

Why are two adjacent substations fed with different phases?

Feeding two adjacent substations with different phases helps to avoid a highly unbalanced load on the traction system, which could be the case if the entire load was connected to a single phase.

What is the function of a neutral section in the traction power supply?

A neutral section is provided between substations to allow the locomotive to cross without power, using its own momentum, and to ensure that different phases are used for feeding different substations.

What is the purpose of sectioning and parallel posts in the power supply arrangement?

Sectioning and parallel posts are provided for emergency supply in case of any interruption in the incoming 25 kV feeder, ensuring continuity of power supply.

Why is the elementary section necessary in the power supply system?

The elementary section is necessary to subdivide the subsection into smaller segments, allowing for rapid isolation of overhead equipment in case of faults and facilitating maintenance work.

How are nearby elementary sections separated in the system?

Nearby elementary sections are separated by insulated overlapped bridges using isolators, and this section is manually operated on no load.

What auxiliary equipment is typically found at a control post?

Auxiliary equipment at a control post includes lightning arresters for protection against switching surges, auxiliary transformers for supplying remote connected equipment, potential transformers for indication, and circuitry for providing information to the remote control center.