What are the method of raising and lowering of pantograph?

Pantographs are typically operated by compressed air from the vehicle’s braking system, either to raise the unit and hold it against the conductor or, when springs are used to effect the extension, to lower it. As a precaution against loss of pressure in the second case, the arm is held in the down position by a catch.

What is not a method of raising and lowering of pantograph?

The present invention generally involves a system and method for lowering a pantograph. Pantographs attached to the rail cars may alternately extend and retract current collectors or contact shoes to electrically connect the moving rail cars to overhead power lines, also known as conductor bars and/or catenary wires.

What is high rise pantograph?

High-rise OHE has been designed for haulage of double stack container trains with stock height of 6809 mm on electric traction. Double stack containers are moving upto Delhi/Rewari on this route and as such, high rise OHE has been erected for working of freight & mail/exp trains on electric traction.

Why is pantograph used?

pantograph, instrument for duplicating a motion or copying a geometric shape to a reduced or enlarged scale.

What is pantograph and its applications?

A pantograph is an old mechanism and is widely used in electrical locomotives to transfer electricity from catenary lines. It consist of 5 linkages forming parallelogram, each of the link is connected with the help of pin joint in order to form a revolute pair.

What is a pantograph on an electric train?

Pantographs are a special devices mounted on electric trains to collect current from one or several contact wires. They consist of a pantograph head, frame, base, and drive system, and their geometrical shape is variable.

How many types of pantograph are there?

In terms of working modes of the drive system, they can be divided into spring-operated pantographs and nonspring-operated pantographs; in terms of the structure of the arm lever, they can be divided into single-arm pantographs and double-arm pantographs, the latter of which can be further divided into four-cantilever …

What is the use of pantograph in electric locomotive Mcq?

Clarification: Open frame, faiveley, crossed arm are typically three types of the pantograph. The function of the pantograph is to maintain pressure and prevent vertical vibrations. Clarification: Full form of EMU is Electrical Multiple Unit. The trains having motor coaches and trailer coaches are known as EMU trains.

What is pantograph machine?

A pantograph engraving machine, or pantograph engraver, is a pantograph which uses a cutting tool at one position on the pantograph’s mechanism to engrave (cut) into a workpiece a design traced out by a tracer or stylus at another position on the mechanism.

What you mean by pantograph?

Definition of pantograph 1 : an instrument for copying something (such as a map) on a predetermined scale consisting of four light rigid bars jointed in parallelogram form also : any of various extensible devices of similar construction (as for use as brackets or gates)

What are pantograph made of?

Pantograph strips are often made of steel, copper alloy, pure carbon, and metal-impregnated carbon, which have different principles of interaction with the contact wire. Carbon strips have smooth surfaces and no rough part that may abrade the contact wire.

What is a pantograph in a railway locomotive?

A pantograph is an overhead electric transmison equipment which transmit the overhead high electricity from the overhead wires to the Locomotives. In Indian Railways all the electric locomotives has dual Pantograph, each for each cab. In earlier times locomotives like WCG-1 had bigger dual type pantographs.

What are the parts of a pantograph?

Pantograph is a set of articulated arms fixed to the roof of the engine. It unfolds and extends along a vertical axis. The horizontal end piece of the pantograph is called head. This head is fitted with carbon strip. Their number and types depends on the nature and intensity of the current to be transmitted that is AC or DC.

Why replace the steel springs of a pantograph with pneumatic?

Replacing the steel springs by a pneumatic system allows to adjust the upwards force easily and to lower the pantograph quickly in case of damage or emergency. Also the newer type of single-arm pantograph is mechanically less complex]