Table of Contents
- 1 What is Section insulator?
- 2 What is PTFE neutral section?
- 3 What is SP and SSP in railway?
- 4 Which isolator is used in Ohe?
- 5 What is the purpose of neutral section in over head line?
- 6 What insulator is used in traction?
- 7 How is 25 kV a.c.50 Hz railway electrification different?
- 8 What kind of AC is used for railway electrification?
What is Section insulator?
The section insulator (SI) is a device installed in the catenary system for electrical separation of two electrical feeds while allowing for the passage of a vehicle pantograph, such as in a crossover between two adjacent tracks.
What is the importance of section insulator?
Section Insulator is a device installed along with the contact wire for insulating two elementary sections where the pantograph of the locomotive negotiates smoothly and maintaining the current continuity. It is used in crossover, turnouts, maintenance pits and yard line, etc.
What is PTFE neutral section?
Short Neutral Section Assembly PTFE Type. • Short neutral section is light weight contact wire insulator of composite type (Resin bonded glass fiber core protected with wear resistance ceramic beads) with Poly Tetra Fluro Ethylene, known as PTFE as shown in figure 1. These should be as per RDSO,s drg.
What is insulated overlap?
Insulated Overlaps In Insulated Overlaps, the two sets of Conductors are separated by 500 mm in air. The gap is decided requiring the minimum air clearance for 25 kV. With this clearance, it is possible to make one length dead keeping the other energized by opening the switch that normally connects the two lines.
What is SP and SSP in railway?
Sectioning and-Paralleling Post (SP) 10207. Sub-Sectioning and Paralleling Post (SSP)
What is 9 ton insulator?
2.6 9-Tonne Insulator: The insulator tube which is normally, though not exclusively, used as a strain insulator for anchoring of conductors, is known as 9-Tonne insulator.
Which isolator is used in Ohe?
Manually operated isolator switches are provided at different points on the main line to sectionalize the OHE into elementary sections and at large yards to isolate different elementary sections for maintenance of the OHE. 2.
What is a neutral section on the railway?
Neutral Section is defined as short insulated dead overhead equipment separating sectors fed by two adjacent substations which are normally connected to different phases. The neutral section is a dead zone and therefore, the locomotive has to negotiate the section in momentum.
What is the purpose of neutral section in over head line?
A neutral section is a discrete piece of equipment included within the overhead contact line (OCL) of an alternating current (AC) electrified railway. It provides the function of electrical separation between two power supply systems.
What is the separation gap length of the two sets of conductors insulated overlaps?
In insulated overlaps the two sets of conductors are separated by 500 mm in air. Bectrical continuity is provided by an isolator, interruptor or booster transformer. Any fixed structure provided over the track.
What insulator is used in traction?
Overhead line insulators are used for transmission, distribution lines and electrical traction lines.
What is difference between SP and SSP?
SP means Superintendent of Police and SSP means Senior Superintendent of Police. Both the posts are the same when an SP becomes a senior then he is elected to the post of SSP.
How is 25 kV a.c.50 Hz railway electrification different?
The 25 kV A.C. 50 Hz electrification system has been developed specifically for railway traction purposes. The main feature that separates this system from the conventional 3 phase and neutral HV distribution network of the public supply authority is that the railway system is a single-phase system with one pole earthed.
Which is the first Indian Railway to use 25 kV power supply?
Indian while completing electrification of HWH-Bardwan section of Eastern Railway decided to adopt 25 kV system in collaboration with SNCF and converted 3000V DC just when it was completed into 25 kV instead running it at 3000 V DC.
What kind of AC is used for railway electrification?
Systems based on this standard but with some variations have been used. 25 kV AC at 60 Hz. In countries where 60 Hz is the normal grid power frequency, 25 kV at 60 Hz is used for the railway electrification.
When did they start using 25 kV AC on railways?
A CSR EMU on the Roca Line in Buenos Aires, using 25 kV AC. This electrification is ideal for railways that cover long distances or carry heavy traffic. After some experimentation before World War II in Hungary and in the Black Forest in Germany, it came into widespread use in the 1950s.