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TPWS - PowerPoint PPT Presentation


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TPWS. Cadizm. TPWS. TPWS. TPWS. TPWS. Cadizm. Cadizm. TPWS. Click On Left Mouse Button To Advance. TPWS. TPWS. Cadizm. Cadizm. TPWS. TPWS: Overview. TPWS is a system designed to reduce the number and. consequences of Signal Passed At Danger (SPAD).

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Presentation Transcript
slide1

TPWS

Cadizm

TPWS

TPWS

TPWS

TPWS

Cadizm

Cadizm

TPWS

Click On Left Mouse Button To Advance

TPWS

TPWS

Cadizm

Cadizm

TPWS

tpws overview
TPWS: Overview

TPWS is a system designed to reduce the number and

consequences of Signal Passed At Danger (SPAD)

incidents, and also to reduce the risk of excessive train

speed causing an accident.

tpws overview3
TPWS: Overview

TPWS is designed as an add-on to AWS. The train driver

Remains responsible for observing lineside signals & speed

restrictions, two additional controls are provided to intervene

in high risk situations.

slide4

TPWS: Overview

  • A Train Stop Sensor (TSS), which immediately applies

the brakes of a train passing a signal at danger.

  • An OverSpeed Sensor (OSS), which immediately applies

the brakes of a train going too fast towards :

A SIGNAL AT DANGER; A SPEED RESTRICTION;

A BUFFER STOP

slide6

50m to 450m

8m to 23m

TPWS : Equipment

TSS

OSS

tpws tss train stop sensor
TPWS : TSS(Train Stop Sensor)

Trigger Loop

Arming Loop

tpws tss train stop sensor8
TPWS : TSS Train Stop Sensor
  • TSS usually positioned at the signal post, unless other items

of equipment are within this position.

  • Trigger Loop placed immediately after Arming Loop
  • Brakes applied on any train passing over TSS when energised
slide9

50m to 450m

8m to 23m

TPWS : Equipment

TSS

OSS

slide10

50m to 450m

8m to 23m

TPWS : Equipment

TSS

OSS

slide11

TPWS : OSS(OverSpeed Sensor)

Trigger Loop

Arming Loop

8m to 23m

slide12

TPWS : OSS OverSpeed Sensor

  • OSS position based upon speed/gradient
  • Trigger Loop / Arming Loop placed a distance apart which

Corresponds to the “Set Speed” of the sensor in metres per second.

slide13

Inner & Outer Scenario

TSS

TSS

Outer Signal

Inner Signal

slide14

TPWS : Inner & Outer Signals

Where a conflict occurs in the full overlap of a signal, that signal

is now referred to as an inner signal. The signal in rear now referred

to as an outer signal, which is also fitted with a TSS as a minimum

The need for an OSS on an outer signal is dependent on whether

there is adequate Safe Overrun Distance to the conflict point of the

inner signal.

slide16

Converging Routes

Where a TPWS fitted signal has converging routes in rear,

just as with AWS consideration must be given for OSS’

on both routes.

However since the requirement for an OSS is based upon

an inadequate SOD which itself is derived from an attainable speed

The requirement for an OSS on a converging route can be alleviated.

slide17

TPWS

Cadizm

TPWS

TPWS

TPWS

Fin

Cadizm

Cadizm

TPWS

A Cadizm presentation

TPWS

TPWS

Cadizm

Cadizm

TPWS