Isolator Switches Operations
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Questions and Answers

What immediate action should the TPC take upon receiving advice of a breakdown of the OHE?

  • Report the incident to the nearest station.
  • Switch off the 25 kV supply to the OHE affected. (correct)
  • Switch on the power supply to the affected area.
  • Inspect the damaged area personally.

Which of the following is NOT a condition that necessitates an emergency power block?

  • A tree falling on the OHE.
  • Derailment on electrified lines.
  • A damaged contact wire fouling the vehicle gauge.
  • A minor repair required for a locomotive. (correct)

What information is essential to provide when reporting an abnormality on the OHE?

  • All essential information including name and location. (correct)
  • The history of previous abnormalities in the section.
  • The weather conditions at the time of the incident.
  • The likelihood of trains being affected.

What should be done if the damage is heavy or dimensions are infringed?

<p>Take steps to protect the lines according to rules. (B)</p> Signup and view all the answers

After receiving incident details, what should the TPC do before obtaining more detailed information?

<p>Switch off the power supply to the section affected. (B)</p> Signup and view all the answers

What is one of the key responsibilities of every railway official regarding abnormalities on the OHE?

<p>To report abnormalities to the TPC or relevant personnel. (D)</p> Signup and view all the answers

When reporting an emergency, how should the reason for the emergency power block be conveyed?

<p>Brief, to the point, and explicit. (C)</p> Signup and view all the answers

What is the primary purpose of Form ETR. 1?

<p>To block lines for electric traction purposes (B)</p> Signup and view all the answers

What information is required in the 'Block the following line/s' section of Form ETR. 1?

<p>Limits between which the block is required (A)</p> Signup and view all the answers

Which of the following is NOT mentioned as part of the message exchange process?

<p>Sending a formal letter for record-keeping (C)</p> Signup and view all the answers

In Form ETR. 1, which roles are specified for sending and receiving the block message?

<p>Traction Power Controller and Section Controller (C)</p> Signup and view all the answers

What is indicated by 'Duration' in the block message?

<p>The expected time length of the blocking (D)</p> Signup and view all the answers

What must be done to the overhead equipment of an elementary section when the isolator number is opened?

<p>It should be made dead and earthed. (D)</p> Signup and view all the answers

What does the block statement indicate about traffic movement?

<p>All traffic movement is suspended in the specified sections. (D)</p> Signup and view all the answers

How should the station master communicate the closing of the interruptor number?

<p>Through a written acknowledgment. (B)</p> Signup and view all the answers

What should happen to the elementary sections after the isolator number is closed?

<p>They should be made alive and available for electric stock. (D)</p> Signup and view all the answers

Which section is responsible for receiving the local block acknowledgment?

<p>Traction Power Controller Section (A)</p> Signup and view all the answers

What information is NOT required in the local block acknowledgment?

<p>Specific reason for the block. (C)</p> Signup and view all the answers

What is the role of the signature in the closing statement of the interruptor number?

<p>It confirms the individual actions taken. (D)</p> Signup and view all the answers

What details are likely included in the local block duration?

<p>Exact hours and minutes of the block. (D)</p> Signup and view all the answers

Which of the following is NOT a part of the local block notification procedure?

<p>Communicating with external parties. (A)</p> Signup and view all the answers

What is required before work can commence on electrical equipment by unauthorized persons?

<p>A written permit-to-work from an authorized person (A)</p> Signup and view all the answers

Who is authorized to issue a permit-to-work for electrical equipment?

<p>An authorized person of the Electric Traction Branch not below the rank of a Senior Linesman (D)</p> Signup and view all the answers

What must the person in-charge of the work do upon completion of the task?

<p>Cancel the permit-to-work card and return it to the authorized person (B)</p> Signup and view all the answers

What action should be taken if there's an interruption in telephone communication with TPC?

<p>Restore normal conditions and cancel the power block if possible (B)</p> Signup and view all the answers

Who retains a duplicate copy of the permit-to-work card?

<p>The authorized person who issued it (C)</p> Signup and view all the answers

What constitutes the cancellation of the permit-to-work?

<p>Withdraw all materials and inform TPC (A)</p> Signup and view all the answers

In the case of multiple working parties in a sub-sector, who is responsible for the permit to work?

<p>One authorized person designated by TPC (B)</p> Signup and view all the answers

What must be ensured before restoring normal conditions on equipment if telephone communication is down?

<p>That no other party has been given a permit for the same section (C)</p> Signup and view all the answers

What information is conveyed in the message sent to TPC upon completion of work?

<p>Confirmation that work is completed and power supply can be restored (D)</p> Signup and view all the answers

What documentation must the person in-charge keep as acknowledgment before commencing work?

<p>An acknowledgment of the permit-to-work card (A)</p> Signup and view all the answers

What must be exhibited when removing the red warning collar to permit shunting movement of an electric locomotive towards the dead section?

<p>A hand stop signal (A)</p> Signup and view all the answers

Where should the shunting movement stop when an electric locomotive is being moved into the main line through the turn-out?

<p>At limiting mast 'P' (B)</p> Signup and view all the answers

What is required for a station master to allow other locomotives to enter the dead section?

<p>A personal inspection to ensure no electric or OHE vehicles are present (D)</p> Signup and view all the answers

What is the purpose of the red warning collars placed on levers near the dead section?

<p>To give protection to the dead section (A)</p> Signup and view all the answers

What procedure is followed when the TPC and the Section controller are in adjacent rooms for power block communication?

<p>Messages are sent in duplicate for acknowledgment (D)</p> Signup and view all the answers

Which form is used for exchanging messages between TPC and authorized persons during shut downs?

<p>Form ETR.2 (D)</p> Signup and view all the answers

How many parts does Form ETR.1 comprise for power block messages?

<p>Three parts (D)</p> Signup and view all the answers

What does an authorized person need to issue a permit-to-work after taking a power block?

<p>Completion of Form ETR.3 (D)</p> Signup and view all the answers

Which of the following statements is true regarding the movement of electric locomotives into the dead section?

<p>Movement is permitted only if no electric vehicles are included in the train (A)</p> Signup and view all the answers

What action should a driver take when instructed not to move beyond a specific point during shunting?

<p>Stop at the designated point (A)</p> Signup and view all the answers

What precautions should be taken before opening an isolator switch?

<p>Confirm that there is no current flowing through the switch. (C)</p> Signup and view all the answers

Who is responsible for verifying that a sub-sector is dead before opening an isolator switch?

<p>The TPC (D)</p> Signup and view all the answers

Under what condition can isolator switches in yards and sheds be opened?

<p>When the entire section is visible. (D)</p> Signup and view all the answers

What happens if an isolator switch is opened while current is passing through it?

<p>Severe arcing will occur at the switch contacts. (A)</p> Signup and view all the answers

Which action can a duly authorized person take regarding the closure of isolator switches?

<p>Close the switch swiftly in one motion regardless of load status. (A)</p> Signup and view all the answers

Which of the following is NOT a requirement to operate an isolator switch in yards?

<p>A surrounding area lockdown is enforced. (D)</p> Signup and view all the answers

What must be done immediately if there is a loss or damage of the padlock or key for an isolator switch?

<p>Report it to the appropriate authorities immediately. (D)</p> Signup and view all the answers

What must be ensured regarding keys controlling lever frames when points and signals are locally operated?

<p>They must be kept with the Station Master on duty. (D)</p> Signup and view all the answers

What action must be taken before a warning collar can be removed from a signal lever?

<p>Exchange messages with a designated private member. (A)</p> Signup and view all the answers

In the absence of a controlling signal for an electric train entering a dead section, what is the required signal arrangement?

<p>A hand stop signal must be displayed at the specific point. (D)</p> Signup and view all the answers

How many warning collars may be required in a large yard to ensure proper safety protocols?

<p>Several, depending on the size and layout of the yard. (D)</p> Signup and view all the answers

Who is responsible for placing warning collars on electric slide instruments or relevant keys?

<p>The Cabin Assistant on duty has the responsibility. (C)</p> Signup and view all the answers

What is the first step an authorized person must take before commencing work on electrical equipment?

<p>Obtain a written permit-to-work in the prescribed form. (C)</p> Signup and view all the answers

Who is required to hold the permit-to-work card after it has been issued?

<p>The authorized person who issued it. (B)</p> Signup and view all the answers

What action must the person in-charge take after completing work on electrical equipment?

<p>Cancel the permit-to-work card and report to TPC. (B)</p> Signup and view all the answers

What should an authorized person do if there is a telephone interruption while canceling a permit-to-work?

<p>Ensure no other permits exist for the same section before restoring conditions. (D)</p> Signup and view all the answers

What is the role of the 'authorized' person regarding the permit-to-work process?

<p>They must hold a rank of Senior Linesman or higher. (C)</p> Signup and view all the answers

In the context of multiple working parties, who is ultimately responsible for the permit-to-work?

<p>Only one authorized person designated for the sector. (C)</p> Signup and view all the answers

What constitutes the cancellation of a permit-to-work?

<p>The withdrawal of men and materials from the worksite. (A)</p> Signup and view all the answers

What must happen immediately upon receiving a permit-to-work card?

<p>The recipient must acknowledge receipt in writing. (B)</p> Signup and view all the answers

What is required from the authorized person when a permit-to-work is issued for work by unauthorized persons?

<p>Earth the electrical equipment specified prior to issuance. (C)</p> Signup and view all the answers

What is the primary purpose of longitudinal protection during a power block?

<p>To prevent the movement of electric rolling-stock on the same track where power is blocked. (C)</p> Signup and view all the answers

Which component is part of a section insulator designed to ensure smooth passage of electric rolling-stock?

<p>Two runners connected to the contact wire. (D)</p> Signup and view all the answers

What should occur immediately after a power block is granted?

<p>TPC must be notified before and after the shutdown. (C)</p> Signup and view all the answers

How are local power blocks officially documented?

<p>In the Form ETR-4 prescribed for recording local power blocks. (C)</p> Signup and view all the answers

What precaution should be taken to avoid bridging during a power block?

<p>Guarantee that all electric rolling-stock has lowered pantographs. (D)</p> Signup and view all the answers

Who are the stakeholders required to take measures detailed in the operational procedures for power blocks?

<p>Station Master, Cabin Assistant Station Master, and other responsible personnel. (B)</p> Signup and view all the answers

What must be ensured before earthing equipment in the context of a power block?

<p>All due precautions as prescribed must be followed. (C)</p> Signup and view all the answers

What mechanism helps separate different sections of OHE in a power block environment?

<p>Section insulators installed on crossovers. (A)</p> Signup and view all the answers

What is a crucial requirement for the issue of a permit-to-work on electrical equipment?

<p>An authorized person must have taken a power block. (D)</p> Signup and view all the answers

What is the protocol before a power block is granted regarding the protection of dead sections?

<p>All Station Masters and Cabin Assistant Station Masters must confirm protection measures. (B)</p> Signup and view all the answers

Which among the following is NOT included in the Station Working Rules for Longitudinal and Transverse Protection?

<p>A list of personnel authorized to modify equipment. (C)</p> Signup and view all the answers

Who is primarily responsible for maintaining protection until a power block is canceled?

<p>Station Master and Cabin Assistant Station Masters. (C)</p> Signup and view all the answers

What aspect must be cataloged in the Station Working Rules due to the risks of accidentally energizing dead sections?

<p>Protective measures for granting power blocks for various sections. (A)</p> Signup and view all the answers

When can the Section Controller permit the removal of protection?

<p>Once the TPC cancels the power block. (A)</p> Signup and view all the answers

What document is deemed valid for granting a power block regarding wiring and sectional arrangements?

<p>The specific drawing of wired and unwired tracks. (C)</p> Signup and view all the answers

Which role is NOT mentioned in the procedure for ensuring that protective measures are taken before a power block?

<p>Power Block Coordinator. (A)</p> Signup and view all the answers

What happens to track modification procedures depicted in the Station Working Rules?

<p>Modifications must be incorporated into the defined drawings prior to implementation. (B)</p> Signup and view all the answers

Which of the following is a critical duty for the Station Master, Yard Master, and Assistant Yard Master regarding protective measures?

<p>To be well-acquainted with the protective measures outlined in the Station Working Rules. (A)</p> Signup and view all the answers

What is the significance of the insulated overlap span and section insulator with respect to electric rolling-stock?

<p>They are key safety features that prevent electrical accidents. (C)</p> Signup and view all the answers

Flashcards

Emergency Power Block

A procedure to switch off 25kV power supply to a section of electrified railway lines in case of OHE (Overhead Line Equipment) damage, accidents, or any other threat and safety concerns.

OHE Abnormality Reporting

Railway officials must immediately report any problems with OHE, tracks, masts/structures, or locomotive pantographs that might endanger train movements, to the TPC.

Emergency Power Block Request

The person finding an OHE problem needs to provide complete information (name, position, location, nature of problem and the reporting place) to the TPC to request Emergency Power Block and should not leave the location without TPC permission.

TPC Action on Report

Upon receiving the report, the TPC immediately switches off the power to the affected section, obtains damage detail, and notifies the duty Section Controller.

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Safety Concerns

Various events like OHE damages, fallen sections, contact with live wires, damaged trains, derailments, and any accident where power cut is needed for safety.

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Isolator Number

A specific number assigned to a switch that isolates a section of railway lines.

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Interruptor Number

A specific number assigned to a switch that controls the flow of power to a particular railway switching station.

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Overhead Equipment

Electrical systems and lines above the railway tracks.

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Elementary Section

A part of a railway line with specific components and designated numbers.

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Electric Stock

Electric trains and locomotives.

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Local Block

A specific section of railway lines that are controlled by a local authority (such as a station master).

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Block Duration (Hrs/Mts)

The estimated time period during which a section of railway lines will remain out of service.

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Form ETR-4

A form used for record keeping of local block activities.

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Permit-to-Work Cancellation

Process for ending a permit-to-work, signaling completion of work and safety checks on electrical equipment.

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Authorized Person

Individual with the authority to issue and manage permit-to-work for electrical work.

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Permit-to-Work (PTW) Card

A document authorizing work on electrical equipment, including detailed guidelines and safety procedures.

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TPC Notification

Communication to the relevant department (likely TPC) to authorize permit-to-work cancellation, based on work completion.

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Local Permit Cancellation

Process of cancelling a permit-to-work when telephone communication is interrupted.

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Multiple Working Parties

Situations requiring work by more than one team within a section or sub-section. One designated person manages the permit-to-work .

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Red warning collar on lever

A red collar placed on a lever to protect a "dead section" (section without power). Removing it allows shunting under controlled conditions.

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Shunting operation

Moving locomotives or trains within a railway yard or station to specific locations.

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Dead Section

A section of railway track without power, requiring specific safety precautions.

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Hand stop signal

A manual signal given to indicate caution or a halt, used to prevent unauthorized movement.

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Imposing a power block

Switching off power to a section of electrified railway lines to prevent accidents.

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Power Block Messages (Form ETR)

Standard forms used for communication between parties involved in power block management.

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TPC and Section Controller

Two key roles in managing railway power systems.

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Steam/Diesel Locomotives

Locomotives not using electricity for propulsion, like steam or diesel.

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Form ETR.4

A form used for arranging local blocks on railway lines.

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Form ETR.1 Part A

A form used to request blocking of lines for electric traction by Traction Power Controller.

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Form ETR.1 Part B

A form used to confirm line blockage status by the Section Controller.

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Power Block Message

Communication for blocking lines (electric trains/all traffic).

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Block Duration (Hrs/Mts)

Estimated time the line block will be in effect.

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Private Number

A specific number used for telephone communication.

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Electric Traction

The use of electric power to operate trains on railway lines.

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Line/s

Segment of rail tracks to be blocked.

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Section Controller

Railway official responsible for line section management.

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Traction Power Controller

Official responsible for managing electrical power for trains.

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Local Blocks

Temporary line closures for specific reasons.

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Isolator Switch Use

Separates sections of the overhead line (OHE) for maintenance. It's NOT used for breaking a circuit while current is flowing.

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Isolator Switch Lock

Isolator switches must always be locked open or closed. This prevents accidental operation.

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Opening Isolator Switches (Main Line)

Requires a TPC (Traction Power Controller) to authorize and ensure the area is 'dead' (no power).

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Closing Isolator Switch (On Load)

Can be closed by a qualified person even with other parts switched on, but do it quickly and correctly.

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Isolator Switch Opening (Yards/Sheds)

Ensure area is clear of locomotives with raised pantographs before opening isolator switches in yards and sheds.

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TPC's role in switch operation

The TPC confirms the area is dead or clear before authorizing any isolator switch operations.

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Arcing Hazard

Opening an isolator switch while current is flowing can cause severe arcing, danger to personnel.

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Dead Section

A section of track without power, needed for safety.

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Permit-to-Work Cancellation

The process of ending a permit-to-work, confirming work completion, and ensuring safety checks on electrical equipment.

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Authorized Person

Someone with the authority to issue and manage permit-to-work for electrical work.

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Permit-to-Work (PTW) Card

A document authorizing work on electrical equipment, with safety procedures and guidelines.

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TPC Notification

Formal communication to TPC (likely a department) about permit-to-work cancellation, following work completion.

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Local Permit Cancellation

A process for cancelling permit-to-work when telephone communication is interrupted.

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Multiple Working Parties

Situations where more than one working team needs to work within a section or sub-section; the TPC issues permits to only one authorized person responsible.

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Private Number

A specific telephone number used for communication.

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Earth the electrical equipment

Connecting electrical equipment to the ground to protect against electric shock.

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Power Block Arrangement

Authorized officials arrange power blocks on railway sidings, following specific procedures.

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Station Master Role

Station masters and others responsible for train movements must follow detailed procedures (paras 20621, 20622, 20625) for power blocks.

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TPC Notification

The TPC (Traction Power Controller) needs to be informed before and after applying a power block.

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Isolator Precautions

Isolators may be opened only after taking the necessary precautions outlined in specified paragraphs (20600, 20622, 20625).

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Equipment Earthing

Proper earthing of equipment is part of the power block process, following prescribed procedures.

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Form ETR-4

Form ETR-4 is used for recording local power blocks.

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Longitudinal Protection

Safety measure to prevent electric trains from moving on the same track where a power block exists.

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Transverse Protection

Section insulators separate different sections of overhead lines (OHE) preventing electrical connections between sections.

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Section Insulator

A device such as a strain insulator that electrically isolates a segment of overhead lines (OHE), allowing safe switching of power.

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Pantograph Danger

Electric locomotives with raised pantographs should avoid sections with active power blocks to prevent electrical short circuit.

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Dead Section Protection

Methods to ensure a section of track is de-energized, preventing accidental train entry.

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Red Warning Collar

A visual marker placed on a signal lever to indicate a section is dead (no power).

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Locally Operated Signals

Signals manually controlled without electrical assistance.

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Electrically Controlled Signals

Signals operated using electrical systems controlled by a Station Master or Asst. Station Master.

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Hand Stop Signal

A manual signal used in sections without automatic signals, to limit train entry.

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Shunting Movement Towards Dead Section

Moving trains/locomotives within a yard or station when a section is not energized.

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Station Master Duty

The person responsible for overseeing station operations, especially dead sections.

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"Beware - No Voltage"

Inscription on a red collar placed on signal lever to indicate no power.

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Dead Section

A section of railway track without power, requiring specific safety precautions.

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Power Block

Switching off power to a section of electrified railway lines to prevent accidents

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Section Controller

Railway official responsible for line section management

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Traction Power Controller (TPC)

Official responsible for managing electrical power for trains

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Longitudinal Protection

Safety measures to prevent power from flowing into a dead section from adjacent sections.

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Transverse Protection

Safety measures to prevent power from entering a dead section from other parts of the railway, like crossing tracks, or junctions.

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Station Working Rules

Rules cataloged for each station detailing protective measures during power block for various sectors, sub-sectors, or elementary sections, used for safety procedures

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Granting power block

The official authorization to temporarily shut off power on a specific section of railway tracks.

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Insulated Overlap Span

An electrically insulated section on railway tracks separating different sections

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Section Insulator

A device used to electrically isolate a section of railway track from adjacent sections.

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Study Notes

20600 Operation of Isolator Switches

  • Isolator switches are used to section off overhead lines (OHE) for maintenance
  • Operating handles must be kept locked open or closed
  • Isolator switches are not designed to break current, only circuits with no current
  • Opening a switch with current can cause severe arcing and operator danger
  • Isolator switches on main lines can only be opened if the relevant sub-sector is dead, as per TPC instructions
  • TPC must ensure the sub-sector is dead before opening an isolator switch
  • Adjacent interruptors can be closed simultaneously

20601 Isolators in Yards and Sheds

  • Isolator switches in yards/sheds can be opened if the entire section is clear (visible) and no locomotives with raised pantographs
  • If conditions aren't met, follow procedures of 20600-4

20602 Maintenance Blocks

  • Two types of blocks for maintenance work on electric traction installations:
    • Traffic Block: Used for major repairs; granted by Section Controller, with consulted TPC
    • Power Block: Used for smaller repairs that doesn't need a traffic block, granted by TPC and by Section Controller
  • Three types of power blocks
    • Emergency Power Block: Used in case of system breakdown or injuries
    • Pre-arranged Power Block: Used for planned work after passage of scheduled trains
    • Locally Arranged Power Block: Used for siding, yard, or shed work.

20603 Power Blocks

  • Power block types : Emergency, Pre-arranged, Locally arranged

20604 Emergency Power Blocks

  • Power block is required in cases like OHE break down, injuries, or equipment falling down.

20605 Reporting Abnormalities in OHE

  • All railway officials must report issues like malfunctions, damaged equipment, or safety issues, either directly to TPC or through Station Master or Section Controller.

20606 Request for Emergency Power Block

  • The person reporting a breakdown must provide details like location of issue, nature of issue, and name of reporter.

20607 Action to be taken by TPC

  • Upon receiving the report, TPC will de-energize affected section, advise Section Controller to switch off, and arrange for protection measures

20608 Precautions after Emergency Power Block is imposed

  • No work on the affected lines will begin until authorized OHE personnel arrive
  • Power must not be restored by TPC until authorized personnel has confirmed earthing at multiple points.

20609 Identification of the Sectors, Sub-Sectors, and Elementary Sections

  • It's crucial that personnel identify areas correctly.
  • Sectors are areas of overhead lines that can be powered by a feeder circuit breaker at a substation.
  • Sub-sectors are identified by the names of the switching stations.
  • Elementary sections are numbered according to direction of power supply, using two/three digits to describe the interrupter, and two-digits for the elementary section number.

20610 Telephone Messages

  • All messages regarding shutdowns, restorations, permits-to-work etc must be confirmed by private number exchanges for clarity
  • A private number book must be maintained for all telephone exchanges to ensure clear communication and accountability.

20611 Procedure for Obtaining Traffic or Power Blocks and Permits-to-work

  • Urgent work needs immediate power blocks and permits-to-work.
  • Maintenance statements for maintenance work must to be submitted by 10am on the first working day to the area Sr. DEE (TrD), containing the particulars of works, location, and trains involved, whether the track is for steam or diesel.
  • A consolidated statement for weekly work must be submitted by 12 noon on Wednesday to the Senior Divisional Operating Manager

20612 Pre-arranged Power Block

  • For pre-arranged power blocks, Section Controller confirmation for availability must be obtained two hours before the required time.
  • Maintenance teams should be ready in time.
  • Section Controller ensures protections are in place on neighboring sectors.
  • TPC confirms availability and instructs staff to begin work.

20613 Restoration Of Supply After a Permit-to-work is Returned

  • After work is complete, ensure all employees and materials are removed from the area
  • All security measures should be ensured prior to reconnection
  • TPC will inform the relevant personnel to restore power supply

20614 Work by other than Authorized Persons

  • unauthorized personnel cannot work on electrical equipment without a written permit-to-work from an authorized person(Senior Linesman or above)
  • An authorized person will earth the equipment and provide a permit- to-work card before handing over the work permit to the worker in-charge
  • Once work is completed, permit-to-work is cancelled

20615 Local Cancellation of Permit-to-Work When Telephones are Interrupted

  • If phone line is down, follow instructions listed in para 20615
  • Local personnel must restore normal (Live) conditions (if possible) and ensure no other groups have a permit-to-work during the period.

20616 Multiple Working Parties

  • For multiple parties working on the same sub-section, only one person can receive the permit-to-work in charge of the work.
  • Other parties can only work in the designated area with permission from the authorized party.

20617 Entry in the Log Book

  • Entries of permit-to-work issuances, equipment status, and timing for all equipment must be recorded.
  • Log Book should record all specifics from the phone call (private number) between the personnel and the TPC.
  • Maintenance works and changes are recorded in the log book immediately as per regulations.

20618 Work Inside Loco Shed or Car Shed

  • Contact the Traction Foreman, Assistant Foreman, or Chargerman (RS) for work permits in such cases
  • No need to report to TPC

20619 Local Blocks

  • Local electrical blocks (not affecting main lines) require manual isolator control.
  • The Station master and involved parties are responsible.
  • TPC must be notified beforehand and afterwards.

20620 Protective Measures for Power Blocks

  • Personnel working with energized equipment need a thorough understanding of safety precautions during power blocks.
  • Protective measures are described in detail for working on sections with live electrical equipment.

20621 Longitudinal Protection

  • Overhead lines are sectioned and insulated to prevent short circuits during power blocks.
  • Sufficient distance between sections ensures safety of work-force.

20622 Transverse or Cross Protection

  • Section insulators on crossovers prevent electrical connection between different sections.
  • Section insulators prevent live OHE lines from connecting to dead section.

20623 Procedure for Arranging Longitudinal and Transverse Protection

  • The Section Controller coordinates safety with Station Masters
  • Working rules ensure protections are adequate before power block approval

20624 Station Working Rules for Longitudinal and Transverse Protection

  • Clear station working rules should accompany safety procedures for power blocks.
  • All personnel must ensure familiarity with procedures to ensure safe operation for power blocks.

20625 Protection of Dead Section

  • Signaling systems and manual equipment lockouts are key in protecting dead sections
  • The signaling devices are used to prevent any accidental contact with live equipment.
  • Procedures and precautions are detailed with emphasis on safety procedures and equipment control.

20626 Shunting Movement Towards Dead Section

  • Shunting movements for non-electric trains are permitted in dead zones under specific conditions (no electric train in the zone, etc)
  • Personal inspection from Station Master to validate these conditions must be completed first.

20627 Movement of Other than Electric Trains

  • Safe passage for non-electric rolling stock in sections with energized equipment, requires specific conditions
  • Checking for presence of live OHE equipment, and verifying their proper isolation, is mandatory.
  • Safety precautions are stressed to avoid accidents.

20628 Standard Forms for Power Block Messages

  • Form ETR 1, ETR 2, ETR 3, ETR 4 are specific forms for power block messaging.
  • Formal documentation is necessary for all power block communications to ensure clear communication
  • Information on all forms must be correct and clear.

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Power Blocks and Permits-to-Work PDF

Description

This quiz covers the operation and maintenance protocols of isolator switches utilized in overhead line electrification. It discusses the importance of ensuring safety when handling isolator switches, including the necessity of locking handles and the conditions for opening these switches. Additionally, it covers procedures for isolators in yards and maintenance blocks.

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