Control Panel and Control Terminal in Electronic Interlocking
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Questions and Answers

What should the maintenance terminal of an Electronic Interlocking system provide for the Signal Technician?

  • A backup power supply
  • Access to configuration settings
  • Remote access to the system
  • Diagnostic tools for fault detection (correct)

    • What is the purpose of Block Working built into EI?

  • To display warnings to the signal technician
  • To test the Electronic Interlocking system
  • To provide an emergency shutdown mechanism
  • To take a line clear when the block section is clear (correct)

    • What is the primary principle of fail-safe circuit design?

  • To cause a signal to display a most restrictive aspect (correct)
  • To minimize power consumption
  • To prioritize speed over safety
  • To eliminate the need for wiring

    • What should be considered when designing fail-safe electronic equipment?

    <p>The effects of faults, component ageing, and variations in component values</p> Signup and view all the answers

    What is the purpose of separating terminals in fail-safe equipment?

    <p>To eliminate the possibility of external objects causing short circuits</p> Signup and view all the answers

    What is the purpose of a shroud in fail-safe equipment?

    <p>To prevent external objects from causing short circuits</p> Signup and view all the answers

    What should be provided in accordance with drawing no.RDSO/S/32019?

    <p>Indication of TCF, TGT, TOL, Bell, Block clear, SNK, SNOEK</p> Signup and view all the answers

    What should be a consideration in the design of circuits using electronic devices?

    <p>Due consideration to the effects of faults in fail-safe electronic equipment</p> Signup and view all the answers

    What is the primary purpose of the physical 'SM Key' in the Control Terminal?

    <p>To protect against unauthorized operation of the Control Terminal</p> Signup and view all the answers

    How many separate 'SM Key' relays are used in the relay room for redundancy purpose?

    <p>Two</p> Signup and view all the answers

    What is the purpose of taking the relay contacts through two different input cards in different OC's?

    <p>To provide redundancy in the system</p> Signup and view all the answers

    What type of counters should be provided while working with Control Panel or Control Terminal?

    <p>Non-resettable counters</p> Signup and view all the answers

    What is the minimum time delay required for unblocking all signals, points, and lines after startup?

    <p>120 seconds</p> Signup and view all the answers

    What is the purpose of the 'All Un Block' option provided during startup?

    <p>To unblock all signals, points, and lines after a time delay</p> Signup and view all the answers

    How should the blocking of a function be indicated on the Control Terminal?

    <p>By a different mark or colour over the concerned function</p> Signup and view all the answers

    What is the purpose of providing a switchover facility between Control Panel and Control Terminal?

    <p>To allow switching between Control Panel and Control Terminal or between two Control Terminals</p> Signup and view all the answers

    What is the primary consideration for the size of the Control Terminal?

    <p>To display the layout of the Yard in well-proportioned dimensions</p> Signup and view all the answers

    What is the purpose of the 'SM Key' in the Control Terminal?

    <p>To protect against unauthorized operation</p> Signup and view all the answers

    How are the relay contacts of the 'SM Key' taken in the relay room?

    <p>Through two separate input cards in different OC's</p> Signup and view all the answers

    What is the requirement for the 'Block' and 'Un-Block' feature in the Control Terminal?

    <p>It should remain effective even during changeover from one Control Terminal to another</p> Signup and view all the answers

    What is the stipulation for Control Panels in future Electronic Interlocking installations?

    <p>They should not be used in future E.I installations</p> Signup and view all the answers

    What is the requirement for the operation of Signals, Points, and other Controls in the Control Terminal?

    <p>They should be carried out through appropriate dropdown menus or other approved means</p> Signup and view all the answers

    What is the consideration for the redundancy of the Control Terminal?

    <p>It should be provided through two separate input cards in different OC's</p> Signup and view all the answers

    What is the requirement for Video Display indications on the Control Terminal?

    <p>They should conform to Control Panel indications and UFSBI Block panel as Block working built into Electronic Interlocking (EI)</p> Signup and view all the answers

    What type of electronic interlocking system installation is required?

    <p>Route setting type using Dropdown menu or Entry/Exit control</p> Signup and view all the answers

    What is the redundancy requirement for Electronic Interlocking systems?

    <p>Adequate built-in redundancy as per approved specification</p> Signup and view all the answers

    What is the display requirement for Control Terminal?

    <p>Display of Yard layout in well-proportioned dimensions</p> Signup and view all the answers

    How shall the operation of Signals, Points and other Controls be carried out?

    <p>Through appropriate dropdown menus or other approved means</p> Signup and view all the answers

    What is the requirement for Control Panels in future Electronic Interlocking installations?

    <p>Control Panels shall not be used</p> Signup and view all the answers

    What is the requirement for Video Display indications on Control Terminal?

    <p>Conform to Control Panel indications as covered in Para 21.1.4</p> Signup and view all the answers

    What is the requirement for Control Terminal/multiple Control Terminals?

    <p>Appropriate size to display layout of the Yard in well-proportioned dimensions</p> Signup and view all the answers

    What type of control shall be provided for Control Terminal/multiple Control Terminals?

    <p>Redundant mode</p> Signup and view all the answers

    What is the primary purpose of the 'All Un Block' option in Electronic Interlocking system?

    <p>To unblock all signals, points, and lines after a time delay</p> Signup and view all the answers

    What is required for unblocking of a function in Electronic Interlocking system?

    <p>SM's key</p> Signup and view all the answers

    How should the blocking of a function be indicated on Control Terminal?

    <p>By a different mark or colour</p> Signup and view all the answers

    What is the condition for operating points in Electronic Interlocking system?

    <p>When the interlocking is free and the point track circuit is clear</p> Signup and view all the answers

    What is the purpose of the latch relay in point control circuits?

    <p>To make the last controlled position of points available</p> Signup and view all the answers

    What is the purpose of the mid stroke point reversal preventing feature?

    <p>To prevent point operation when the point is under operation</p> Signup and view all the answers

    What is the requirement for controlling each 'Normal' or 'Reverse' operation of point?

    <p>Two output relays derived from two output bits</p> Signup and view all the answers

    What is the requirement for operating a point when the point zone track circuit fails?

    <p>Inserting an emergency key in a separate box</p> Signup and view all the answers

    What is not required for clearing Calling On signals?

    <p>Stop signal ahead is not blank</p> Signup and view all the answers

    When is approach locking or dead approach locking provided?

    <p>For all manual stop signals</p> Signup and view all the answers

    What is provided on the control panel where section ahead is worked on Absolute Block System?

    <p>A white indication for block control on the last stop signal</p> Signup and view all the answers

    What is the purpose of interlocking between conflicting routes?

    <p>To achieve route interlocking electric circuits at route initiation stage</p> Signup and view all the answers

    What is not required for clearing shunt signals?

    <p>Stop signal ahead is not blank</p> Signup and view all the answers

    What type of interlocking system installation is allowed?

    <p>Route setting type</p> Signup and view all the answers

    What is the condition for operating points in Electronic Interlocking system?

    <p>Points are operated by individual operation of switches or push buttons</p> Signup and view all the answers

    What is the purpose of controls on level crossings, ground frames, cabins, sidings etc.?

    <p>To suitably interlock with other controls</p> Signup and view all the answers

    What is the condition for operating points in Electronic Interlocking system?

    <p>Points are correctly set and locked in the route</p> Signup and view all the answers

    What is required in Signal Clearance to allow gate closing?

    <p>All interlocked level crossing gates are closed and locked against road traffic</p> Signup and view all the answers

    What is the requirement for route setting and clearance of signal?

    <p>SM's key is In and interlocking is free</p> Signup and view all the answers

    What is the limitation on the number of relay contacts in series?

    <p>Not more than 45</p> Signup and view all the answers

    What is the requirement for new installations?

    <p>Route setting type interlocking</p> Signup and view all the answers

    What is the requirement for track circuits in the route?

    <p>Track circuits are clear</p> Signup and view all the answers

    What is the requirement for crank handle keys in the route?

    <p>Crank handle keys are locked and control is not released</p> Signup and view all the answers

    What is the requirement for slot from other agency?

    <p>Slot is received and proved</p> Signup and view all the answers

    What is the condition for emergency cancellation of a calling route without providing any back lock track?

    <p>On physical verification of the full route by SM</p> Signup and view all the answers

    What is the timer delay for signal overlap (release) in big yards?

    <p>60 seconds</p> Signup and view all the answers

    What is the primary condition for calling on signal below Home Signal to be initiated?

    <p>Train has come to a stop, as ensured by SM</p> Signup and view all the answers

    What is the delay in seconds for opening of LC gate (Gate signal at 180 m from LC) with sequential proving of two track circuits?

    <p>0 seconds</p> Signup and view all the answers

    What is the purpose of signal overlap (release) timer in relay interlocking systems?

    <p>To start automatically on clearance of last back track circuit of Home Signal route</p> Signup and view all the answers

    What is the condition for calling on signal below Home Signal to be initiated in terms of train movement?

    <p>Train has passed beyond signal overlap track circuits</p> Signup and view all the answers

    What is the primary purpose of providing sequential proving of two track circuits in relay interlocking systems?

    <p>To prove that train has passed beyond LC gate</p> Signup and view all the answers

    What is the timer delay for signal overlap (release) in normal yards?

    <p>120 seconds</p> Signup and view all the answers

    What is the primary consideration for the design of circuits of interlocking?

    <p>Industry's best practices and principles of Reliability, Availability, Maintenance, and Safety</p> Signup and view all the answers

    What is the purpose of using dual OFC in Distributed type of Electronic Interlocking?

    <p>To reduce the extent of copper cables and provide an alternate path in case of failures</p> Signup and view all the answers

    What is the requirement for the display of the layout on the front of the Control Panel?

    <p>It should be well-proportioned</p> Signup and view all the answers

    What is the primary purpose of separating the areas covered by each track circuit on the Control Panel?

    <p>To distinguish the areas covered by each track circuit</p> Signup and view all the answers

    What is the requirement for the design of circuits using electronic devices?

    <p>The design should consider industry's best practices and principles of Reliability, Availability, Maintenance, and Safety</p> Signup and view all the answers

    What is the primary purpose of using a domino type panel in Control Panels?

    <p>To provide additional facilities, such as Block Working</p> Signup and view all the answers

    What is the requirement for the design of circuits of interlocking in existing installations or alterations?

    <p>The design should be Non-route Setting Type, i.e., Route is set with individual operation of points</p> Signup and view all the answers

    What is the primary purpose of providing a clear indication of the route setting on the Control Panel?

    <p>To enable the signal technician to operate the signals and points efficiently</p> Signup and view all the answers

    What indication should be given on the control panel for a shunt signal located on the same post as a running signal?

    <p>A white light strip below the running signal indication</p> Signup and view all the answers

    What should be lit up on the control panel when set for automatic working?

    <p>A white light for 'A'/'AG' marker indication</p> Signup and view all the answers

    What indication should be given on the control panel for the 'OFF' aspect of a shunt signal?

    <p>A slanting white light strip</p> Signup and view all the answers

    What should be indicated on the control panel when a 'Calling on' signal is 'OFF'?

    <p>A white light below the running signal indication</p> Signup and view all the answers

    What should be indicated on the control panel for the 'ON' aspect of a shunt signal on an independent post?

    <p>A white light strip or two miniature white lights</p> Signup and view all the answers

    What should be indicated on the control panel for the failure of green aspect?

    <p>Green flashes red, blank</p> Signup and view all the answers

    What should be indicated on the control panel for the failure of double yellow aspect?

    <p>Both green and red flash</p> Signup and view all the answers

    What should be indicated on the control panel for the failure of red aspect?

    <p>Green not lit, red flashing</p> Signup and view all the answers

    Study Notes

    Control Panel/Control Terminal

    • Control Panels shall not be used in future Electronic Interlocking (E.I) installations.
    • Control Terminal/multiple Control Terminals shall be of appropriate size to display the layout of the Yard in well-proportioned dimensions and shall display all functions clearly distinguishable.
    • Normally Control Terminal/multiple Control Terminals shall be provided in redundant mode.

    Video Display Indications

    • Video Display indications on Control Terminal shall conform to Control Panel indications and UFSBI Block panel as Block working built into Electronic Interlocking (EI).

    Operation and Control

    • Operation of Signals, Points, and other Controls such as Gate, Crank handle, Siding, Slot, etc. shall be carried out through appropriate dropdown menus or other approved means.
    • Control Terminal shall have suitable protection facility against unauthorized operation which may be provided by physical "SM Key" in a separate box.

    Emergency Operations

    • All Emergency operations shall be two-step process protected against unintended operations.
    • Emergency operations provided when point zone track circuit fails and after line verification from site by traffic personnel.

    Block Working and Controls

    • Control Terminal shall have provision for Signal, Point, and Line Block Collars equivalent of Control Panel in the form of individual "Block" & "Un-Block" feature which shall remain effective even during changeover from one Control Terminal to other Control Terminal.
    • Only non-resettable counters shall be provided while working with Control Panel or Control Terminal.

    Maintenance and Interlocking

    • Maintenance Terminal of Electronic Interlocking system shall be provided for the Signal Technician.
    • Block Working built into EI shall be provided for line clear purpose.

    Design Principles

    • Fail-safe principles shall be incorporated in the design of the equipment.
    • Component failure shall be self-detecting by way of causing a signal to display a most restrictive aspect as far as practicable.
    • All fail-safe circuits shall work on continuous energisation principle such that open circuits in wiring, relay contacts, etc. or loss of power supplies shall not cause unsafe conditions.

    Electronic Interlocking System

    • Electronic Interlocking System shall be suitable for working on Electrified and Non-Electrified sections.
    • Electronic Interlocking System Installation shall be of Route setting type using Dropdown menu Or Entry/Exit control with a facility for individual operation of points.
    • Signalling and interlocking arrangements for the Yard shall be in accordance with the approved Signal Interlocking plan (SIP) and Control Table.

    Interlocking Circuits

    • Interlocking between conflicting routes is achieved through route interlocking electric circuits at the route initiation stage.
    • Approach locking or dead approach locking is provided for all manual stop signals, effective from a predetermined point on approach of the signal.
    • Controls on level crossings, ground frames, cabins, sidings, etc., are suitably interlocked.

    Route Setting Type

    • Route setting and clearance of signal are done with the following conditions:
    • SM's key is in
    • Interlocking is free
    • Points are correctly set and locked in the route, including overlap and isolation (if any), to the desired position
    • Crank handle keys for all motor-operated points in the route, overlap, and isolation are locked and their control is not released
    • All interlocked level crossing gates are closed and locked against road traffic in the route and overlap (if any)
    • Slot from other agency has been received
    • Track circuits in the route up to the next signal/dead end, overlap, and isolation, and fouling (if any), are clear

    Non-Route Setting Type

    • For existing installations and alterations only; no new installations of non-route setting type to be provided
    • Route setting and clearance of signal are done with individual operation of points and push buttons

    Controls and Indications

    • A white indication for block control on the last stop signal should be provided on the control panel, where:
    • Section ahead is worked on Absolute Block System and control panel and block instrument are placed at different locations
    • Block working is by means of axle counter or track circuit
    • Control panels should have a well-proportioned display of the layout on the front, with areas covered by each track circuit clearly distinguished by different colors
    • Signal indication for 'ON' aspect of a shunt signal on the same post as the running signal is not required
    • Signal indication for 'OFF' aspect of a shunt signal shall be given by a slanting white light strip or two miniature slanting white lights

    Timers in Various Circuits

    • Timers are provided for various circuits, including:
    • Calling On signal below Home signal
    • Opening of LC gate
    • Signal Overlap (release)
    • Emergency cancellation of calling route
    • Timers have specified delays in seconds for each circuit

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    Chapter 21: Relay & Electronic Interlocking Design Criteria PDF

    Description

    Quiz on Control Panel and Control Terminal requirements in Electronic Interlocking Installations, including display and functionality specifications.

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