What is track shunt resistance?

Rail resistance Train shunt resistance. causes the front contact of the track relay open is called as train shunt r esistance. The train shunt resistance should not be less than 0.5 ohms in case of wooden sleepers and 0.25 Ohms in case of concr ete sleepers.

How is rail resistance calculated?

Train resistance is calculated by multiplying the resistance per ton at each speed, by the total tonnage of the train.

How is ballast resistance measured?

To test your ballast resistor you need an ohm meter or multimeter set to ohms. Remove the connectors from both sides of the resistor. The ohms should read between 1.8 and 5 ohms. You should be getting 9 volts to the positive side of the coil.

What are the main components of a DC track circuit?

A D.C. track circuit has two ends i.e. feed end and relay end. Both the ends are insulated by a Nylon joint or glued joint. It is short-circuited by any means. Otherwise track relay will be in energised position.

What is track shunting?

Shunting, in railway operations, is the process of sorting items of rolling stock into complete trains, or the reverse. In the United States this activity is known as switching.

What is track bonding plan?

The majority of running rails are used to form track circuits to provide a means of proving the absence of trains. The General arrangement is that a low power signal is transmitted from ans end of the track circuits, along one rail, to a receiving device.

What is a grade resistance?

Grade resistance is the simplest form of resistance. It is the gravitational force acting on the vehicle. This force may not be exactly perpendicular to the roadway surface, especially in situations when a grade is present.

What is the resistance of one of the rails of a railway?

[Ans: 0.48 2]

Can you test a ballast with a multimeter?

Test your electronic ballast’s resistance using your digital multimeter. To measure it, set your digital multimeter to around a thousand ohms resistance setting. Connect the black leads to the white ground wire on your ballast. When you do this test, a good ballast will return an “open-loop” or max resistance.

What’s the difference between a ballast and non ballast coil?

A ballast coil is designed to produce the same spark output, but with only 6 to 9 volts on the input. With a non-ballast coil, the input to the coil is the same, 12 volts, whether the engine is running, or being cranked by the starter motor.

How do railway track circuits work?

Each block has a track circuit which determines whether a train is present. Track circuits work by running a circuit using the rails to connect a power source at one end of the block with a relay at the far end. If the circuit is complete, the relay will be energized, which keeps signals in the “clear” position.

What is DC track circuit?

Closed DC Track circuit is used on Indian railways which is normally in energised condition and de-energises when occupied by a vehicle or train. Double rail track circuit In double rail track circuit both the running rails are insulated from adjoining sections by insertion of block joints.

What is the purpose of high voltage tracking resistance?

High voltage tracking resistance (IPT) This method is used to assess the susceptibility to tracking of insulating materials that are exposed to high voltages outdoors. Insulators installed in the open are often at the mercy of humidity. Their electrical insulation properties can deteriorate to such an extent as a result…

How is the series resistance of a track circuit adjusted?

The series resistance is so adjusted as to give sufficient voltage to the relay when track rails are shunted by axles. In this type of track circuit, if any connection breaks, its occupation goes undetected.

Why do we need tracking resistance in insulators?

This method is used to assess the susceptibility to tracking of insulating materials that are exposed to high voltages outdoors. Insulators installed in the open are often at the mercy of humidity. Their electrical insulation properties can deteriorate to such an extent as a result that tracking paths are formed on the insulator surface.

How is traction current continued on a track circuit?

Figure The traction current can continue on the next track circuit by flowing through the terminal bond. 2. Double rail insulation:- Terminal bond allows to delimit the track circuit at a boundary with an Insulated Rail Joint on both rails as shown in Figure.