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GE AT1 Panel > General Questions > Flashcards

General Questions Flashcards

1
Q

Define the term ‘Isolation’?

A

The disconnection and separation from all sources of hazardous energy in such a way that the
disconnection and separation is secure. E.g. a CB is opened, lock applied and caution/danger notice applied.

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2
Q

List three types of Safety Document?

A

Limitation Of Access

Permit To Work

Sanction for Test

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3
Q

What is meant by the term HPU?

A

Hydraulic pressure unit – Which supplies hydraulic pressure to systems such as Rotor Lock.

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4
Q

What 3 things must be considered when working on Live LV systems?

A

It unreasonable in ALL considerations to work on the system when DEAD.

It is reasonable in ALL considerations to work on the system while LIVE.

All safety precautions have been ensured prior to working on the system.

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5
Q

Define OFW ESP terms for work on the hydraulic system.

A

Vent - Having an outlet open to the atmosphere, and so arranged that pressure can equalise
to atmospheric pressure.

Drain - The emptying of contents from a component. For example, oil from a tank or pump.

Purge - A condition of Mechanical Equipment from which any Dangerous contents have been
scavenged.

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6
Q

What does the acronym ERP mean?

A

Emergency Response Plan

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7
Q

Identify and explain the different types of pad-locks used in OFW ESP.

A

Safety Lock/Keys
- Red in colour
- Used by the AT for Isolations
- Must be insulated for electrical isolations

Personal Locks/Keys
- Blue in colour (Sometimes yellow for contractors is responsible manager deems it necessary)
- Used by all personnel working on Plant/LV apparatus
- Used by all persons in the party to secure the lock box

Control Lock/Key
- Green in colour
- Used by the AT in order to surrender the AWP to another AT – All personal locks will be removed prior to handover

General Safety Lock/Key
- Orange in colour
- Used to ensure that no remote access can re-energise the WTG.

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8
Q

When testing between a single phase of a 3-phase 400V system to earth what voltage would you expect?

A

230V

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9
Q

When testing between a single phase 230V system and earth what voltage would you expect?

A

230V

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10
Q

What does the GE OFW ESP provide?

A

A safe system of work

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11
Q

What is an AWP and what does it provide?

A

Approved Written Procedure, which will provide safety from the system.

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12
Q

What is GE’s Electrical safety technical standard?

A

Document TS2003

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13
Q

What are the 6 rules of ESP which are also found in the AWP?

A
  • Prepare for shutdown
  • Shutdown
  • Isolate energy sources & apply safety locks & caution notices
  • Control stored energy
  • Verify stored energy (Earth HV)
  • Return to service
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14
Q

Able to explain and/or demonstrate each section of the AWP.

A
  1. 0 Work Details
    - Wind farm location
    - WTG No.
    - Work/testing to be done
    - Associated documents
    - date
  2. 0 Transfer of Control
    - Time of transfer
    - The OC and AT’s name.
  3. 0 Establish Safety Precautions
    - Establish local control of the WTG
    - Establish general safety
    - POI application with time and signature of the AT
    - Precautions (the AT signs to certify General Safety and Safety from the System)
    - In some AWP’s a ROMP section
    - End of work/Testing and clearance section (the AT signs to confirm all tools and equipment are cleared, all guards are back in place and the WTG is safe to return to service) – Also a section to write any restrictions or limitations.
  4. 0 Return to Service
    - Cancellation of AWP and removal of POI
  5. 0 Transfer of Control
    - Handing back the turbine into normal operation conditions, informing the OC, with dates and times.
  6. 0 Surrender
    - If work is carried out over a number of shifts, this section will allow the AWP to be passed from the Authority of one AT to another. The OC must also be informed of this.

7.0 Historical Data

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15
Q

What colours are used in an AWP and what do they determine?

A
  • Yellow: Caution
  • Red: ROMP - Restoration of motive power
  • Green: Cross-boundary
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16
Q

What are the GE life-saving principles?

A
  • Confined Spaces
  • Electrical Safety
  • Excavation Works
  • Forklift and material handling
  • Hazardous substances
  • Lifting operations
  • Lock out, Tag out (LOTO)
  • Machine safety and powered hand tools
  • Motor vehicle
  • Radiation safety
  • Work at height
  • Working with contractors
17
Q

When is a system considered not to be live?

A
  • Isolated and locked off.
  • Caution notice applied.
  • Proved dead with approved and calibrated testing equipment.
18
Q

What PPE must be worn when testing for dead?

A

Referring to the document: TS2003

  • Insulated Class 0 gloves with cotton inner gloves.
  • Correct rated PPE i.e. Class 2 long sleeve, arc flash and fire retardant.
  • Arc flash visor
19
Q

What are the importance of signature checkpoints on an AWP?

A

To signify the time that isolation was applied, giving accountability through a signature and ensuring the isolation has been applied before moving to the next.

20
Q

What is done with the lockbox during work?

A

The lockbox is to be kept by the AT when carrying out work under an AWP or kept by the CT when working under an ROP.

21
Q

What are the 5 General Provisions?

A

GP1 - General Safety

GP2 - Additional safety rules and precautions (Management instructions)

GP3 - Special Instructions - Loss of keys, AWP, AT

GP4 - Objections on safety grounds

GP5 - Reporting of accidents and dangerous occurrences

22
Q

How would you check that there is zero volts on a DC circuit?

A
  • Test between the negative terminal and earth.
  • Test between the positive terminal and earth.
  • Test between the positive and negative terminals.
23
Q

Explain and communicate the responsibilities of an Authorised Technician and what type of OFW ESP documentation an AT can hold.

A
  • Ensure both he/she & all members of party follow requirements of general safety.
  • Follow the requirements on an AWP, including any selected persons reports and work within the limits of the documents.
  • Follow the Wind Farms Transfer of Control procedure, contact the OC to report – Location, PAX, Names (that aligns with a list of approved Technicians/AT’s), the AWP and the time of transfer.
  • Responsible for the operational state of the WTG following the Transfer of Control.
  • Returning the WTG to the OC, confirming work/testing completion and AWP closure. Also notifying of any limitations or restrictions to operational state of turbine.
  • Responsible of leading the party throughout work and provide immediate or personal supervision as stipulated in AWP.
  • Complete AWP as required. All signature points are signed at time of action and clearance/cancellation is enacted correctly.
  • Reporting issues within AWP and to follow instructions of the AE.
  • Informing the working party of any emerging risks and ensuring all leave the work location.
  • Placing any uncompleted AWP into Safe Custody and enacting Transfer of Control.
  • ALWAYS provide personal supervision when motive power is restored.
  • Keep personal control of all Safety Documentation, Keys and removable isolating devices.

Documents – ALL TO BE IN DATE & CORRECT VERSION.

  • AWP
  • RA
  • MS
  • TPTB
  • Crane Check sheets
  • MFI’s
  • LFI’s
24
Q

Explain and communicate the responsibilities of a Competent Technician.

A
  • Gaining ‘Consent’ as detailed in the ESP from the Operational Controller, prior to establishing and maintaining General Safety under a Routine Operating Procedure;
  • Ensuring correct tools, equipment and PPE for the work are available and used;
  • Implementing the necessary measures to establish General Safety at and in the vicinity of the workplace, and ensuring that those measures are maintained throughout the work;
  • Setting the Working Party to work with Personal Supervision during work under a Routine Operating Procedure;
  • Ensuring conditions of other work areas are not adversely affected by the activities for which he/she is responsible.
  • Consultation in the event of stop work through General Safety.
25
Q

Name two hazards associated with batteries.

A
  • Potential of electrical shock
  • Potential of explosion
  • Potential chemical hazards
26
Q

Describe your standard working day as an AT?

A
  • Attend a toolbox talk with Service lead/Supervisors to gain information on the task that is to be carried out. i.e. What documents will be needed/used, tools, PPE etc.
  • Toolbox will also cover weather conditions, safety alerts, limitations and restrictions, simultaneous operations, task priorities and discuss general wellbeing.
  • AT will receive paperwork (AWP, RA, MS (MFI/LFI), TPTB) and laptop/Ipad.
  • AT will check documentation. Whether the AWP is correct against work scope, whether it is in colour, correct version and date.
  • AT will organise the consumables/tooling that is needed. Ensuring all tools that need to be calibrated and in date, are. Also, testing and signing out torque wrenches.
  • AT will ensure test for dead equipment is calibrated, in date and packed along with the lock-out devices and caution notices.
  • TBT will be carried out between AT and crane operator, agreeing on what is to be craned and hand/radio signals. A lift plan will be signed.
  • Correct PPE to be inspected and worn for transfer, ensuring the working party all follow PPE requirements (Buddy checks).
  • On approach to the turbine, keep an eye out for any hazards i.e. is the turbine in the correct position for SOV approach. Are the weather conditions suitable to transfer safely?
  • Radio check with vessel and crane operator before transferring.
  • Once transferred, enact the transfer of control with the OC, exchanging…
    • WTG ID, AWP No. and revision, work order number, transfer of control time, your name, OC name, date and time.
  • Establish general safety.
  • Conduct a TBT with the working party.
  • Apply the isolations as stated in the AWP. Follow the step by step procedure of isolations, applying locks and caution notices, testing for dead (prove, test, prove).
  • Once AWP is complete to the point where work can be started, ensure personal locks of the working party are applied to the lockbox and begin the task.
27
Q

What is a VAT?

A

Voltage Absence Tester

28
Q

Can a multimeter be used to prove dead?

A

No, the testing equipment must be approved and specific to the voltage that is being worked on.

GE AT1 Panel (11 decks)

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