TI21 Track Circuits

Advanced Fault Finding

Introduction

Delegates attending this course will develop their skills and knowledge to conduct advanced fault finding (and early detection/prevention) activities on TI21 track circuits efficiently and effectively and concentrates on the use of fault finding equipment including the Lemflex, Rocoil, S.I.T and TTM. This course has been developed by us in association and on behalf of Network Rail and is at present the Network Rail approved TI21 training course for Advanced Fault Finding.

Objectives

On successful completion of the course the candidate will be able to:

	Identify the main components of a TI21 track circuit
	Explain the principles and operation of a TI21 track circuit
	Identify different configurations of TI21 track circuits
	Identify 'Bonding' & 'Scheme Plan' symbols
	Fault diagnosis and rectification to a TI21 track circuit using a systematic approach
	Produce current and voltage profiles for a TI21 track circuit
	Use test equipment specific to TI21 including Frequency Selective Meter (FSM), LemFlex, Sleeper Integrity Tester and the Rocoil
	Interpret results from specific test equipment to identify possible faults at an early stage
	Identify Infrastructure conditions that may effect correct operation of TI21
	Carry out advanced fault finding activities

Who Should Attend

Network Rail S&T Technicians and those who work within faulting teams who will be expected to carry out fault finding and maintenance activities on TI21 track circuits.

Prerequisites

Candidates should have a good knowledge of TI21 track circuits and have previous experience of working with these tracks. Candidates should also understand how and where voltages should be taken on TI21, what voltages should be expected and how to complete a track record card.

Features

Provides comprehensive fault finding techniques using test equipment currently available. This course allows the candidate the opportunity for fault finding using the latest test equipment available for TI21 track circuits in a safe environment on our fully operational Low Power track circuit with Tuned Zone and our separate Normal Power Tuned Zone. This allows each candidate the chance to locate and rectify faults applied to the equipment followed by taking complete readings required to fully complete a record card to laid down standards. Candidates will also take readings in order to produce 'graph' style profiles of the track circuit (very useful in track monitoring and early failure detection/prevention). Our track set up allows for the use of test/fault finding equipment; i.e. the Sleeper Integrity Tester (for detection of failing/failed sleepers), the Lemflex (used for testing impedance bonds), the Rocoil (used for track profiling but also very good for locating short circuits between the running rails) and the use of the FSM and the TTM as well as a digital volt meter.

Learning Approach

Classroom theory sessions using visual aids, practical demonstrations with fault finding sessions.

Assessment

Written test paper plus practical assessment (both of which must be passed to receive a certificate of merit) with evidence collection during the course

Duration

2 days

Further courses

Support - one day refresher every 2 years (optional)

Number of Participants

Maximum 6

Booking Code: TI21AFF