Question 1

How do you identify the planned outage area?

Accepted Answer

Locate applicable drawings, confirm work scope with stakeholder, then discuss with senior operations, technical staff and other stakeholders

Answer

Look up a previous switching program for the type of isolation being performed.

Answer

Contact the Western Power outage and fault phone line.

Answer

Conduct a job risk analysis in the form of a Synergy Take 5 or safe work method statement as appropriate.

Question 2

How would you know there is a requirement for a switching program to be completed?

Accepted Answer

SIM2.49 details when a Switching Program is required, typically these outages are communicated through Operations Supervisors and the Permit Request system.

Answer

An alarm is generated on the DCS to notify when a switching program is required.

Answer

Ring the system operations control centre ask them.

Answer

Notification will typically come from the security guard at the gatehouse.

Question 3

How could you confirm the implications of the switching program on the power generation system?

Accepted Answer

Understand the outage area, then review the switching program with experienced senior operations staff.

Answer

Understand the outage area, then review the switching program with experienced senior administrative staff.

Answer

Check what plant was de-energised after you have stepped through your switching sequence.

Answer

Once the switching program is drafted, take it to the next offsite morning tea to discuss with other colleagues undergoing training in a similar area.

Question 4

What systems provide you with nominal and applicable electrical plant loading limits?

Accepted Answer

The DCS has alarms associated with over-current conditions, equipment name plate data and Plant Operating Instructions will all provide relevant information relating to loading.

Answer

There is no need to worry about electrical loading, all the electrical systems were designed with no limitations in mind.

Answer

Check the panel voltmeter, the scale will indicate the load limit.

Answer

The Permit to Work system provides all the relevant plant interconnection and loading limit data.

Question 5

Who needs to be consulted when planning an electrical plant outage?

Accepted Answer

Operations, work scope stakeholders and relevant stakeholders impacted by the outage, or controlling isolating apparatus.

Answer

Operations, Administration and Western Power Network Operations

Answer

Western Power Network Operations, Chemical Services, Security and Head Office Asset Optimisation Engineering Team

Answer

Operations, Western Power System Operations, Western Power Network Operations.

Question 6

What governing manual is used by Synergy to ensure compliance with the relevant legislation applicable with isolating and earthing plant?

Accepted Answer

GBU-MAN-HAS-0001– Permit to Work Manual

Answer

Electrical System Safety Rules

Answer

Western Australian Electrical Requirements (WAER)

Answer

MUJ-WIS-HAS-0192- SIM 2.49 – Electrical Switching Program Standards

Question 7

What is the minimum approach distance for 132kV for authorised persons?

Accepted Answer

1200mm

Answer

3000mm

Answer

1800mm

Answer

700mm

Question 8

How could you confirm in the isolation process that a circuit has been de-energised and there is no back feed?

Accepted Answer

Check the panel voltmeter that was reading voltage is now reading zero, or; there is visible air gap, or; phase lights that were on, are now extinguished.

Answer

On a rack-able circuit breaker, check that the circuit breaker has physically moved out & indicating disconnected to form a physical air gap, then confirm the same process at the other end of the circuit, then confirm there is no loading on the panel ammeter.

Answer

Check the panel voltmeter that was reading voltage is now reading zero, or Check the panel ammeter is showing a reading of zero

Answer

Check the panel ammeter is showing a reading of zero

Question 9

When is it permissible to not use a switching program?

Accepted Answer

When the only isolation is a radial feed and there is no interconnection.

Answer

When both HV and LV are part of the same isolation.

Answer

When only LV is being isolated

Answer

When the HV switchyard forms part of the isolation.

Question 10

When interconnected plant is isolated for maintenance, what portion of the maintenance access permit aligns with the “Limits of Isolation” listed on the switching program?

Accepted Answer

The isolation point(s) as listed in the Isolation schedule

Answer

The method of isolation used and listed in the Isolation schedule

Answer

Where the isolation point is located, as listed in the Isolation schedule.

Answer

How the isolation is proven de-energised prior to application of earthing apparatus, as detailed in the Isolation schedule

Question 11

Once a Switching Program is drafted by an authorised person, who is authorised to verify the accuracy of it?

Accepted Answer

Someone who holds the appropriate switching operators authority for the plant being operated and was not the preparing officer.

Answer

Someone who holds a switching operators authority for a different part of the plant and was not the preparing officer

Answer

The maintenance supervisor who will co-ordinate the maintenance activities once the maintenance access permit is issued.

Answer

The preparing officer who holds the appropriate switching operators authority for plant being operated.

Question 12

Where should completed internal switching programs be stored?

Accepted Answer

On successful completion, store them with the completed maintenance access permit for archiving in accordance with permit to work procedures.

Answer

On successful completion, hand them to the respective unit controller for scanning for log book archives.

Answer

On successful completion, they can be placed in the confidential paper bins for secure destruction.

Answer

On successful completion, they can be thrown away.

Question 13

What documentation assists you to determine appropriate HV network configurations.

Accepted Answer

Plant Operating Instructions

Answer

Electrical System Safety Rules

Answer

Western Australian Electrical Requirements (WAER)

Answer

MUJ-WIS-HAS-0192- SIM 2.49 – Electrical Switching Program Standards

Question 14

Who should be consulted when planning to respond to an unexpected loss of supply to a portion of the plant?

Accepted Answer

Immediate stakeholders impacted by, or in control of the plant impacted, escalate as needed.

Answer

The Stage CD permit office & Western Power Network Operations

Answer

Wait the for the notification to be entered, planning team to then generate a work order and follow approved planned work process.

Answer

The Stage CD permit office & Electrical maintenance team.

Question 15

A local 11kV Volt meter is indicating 0V, but the remote indication is indicating 11kV, what is a reasonable response?

Accepted Answer

Assess the situation, check up-stream volt meters and plant status to ascertain if it is genuine. Make a rectification plan or enter a defect if not.

Answer

Do nothing, maintenance will find this the next day.

Answer

Check the down-stream volt meters, if they are 0V, then it’s likely to be a genuine 0V and no rectification plan or defect will be required.

Answer

Head back to the control room as you are sure it is 0V and there must be a step in the switching program missed.

Question 16

When genuine emergency fault response is assessed, as needed by senior operations or engineering staff for internal plant, what process should be followed?

Accepted Answer

The senior staff can dynamically risk assess the emergency situation and co-ordinate to the best of their ability without introducing added risk of switching program delays.

Answer

Follow the approved switching program preparation and verification process as detailed in SIM 2.49

Answer

Call the Western Power fault and incident line.

Answer

Call the Electrical Plant Engineer, then Station Manager. They will contact the CEO who will then advise what to do.

Question 17

During Switching activities, you come across plant that is labelled differently and doesn’t align with the plant drawings, what should you do?

Accepted Answer

Ask for clarification and verification from technical staff, inform relevant stakeholders, place interim measures in place, enter a notification for documentation/label updates if an update is needed.

Answer

Let the permit officer know.

Answer

Ignore the drawing, the plant label is correct.

Answer

Ignore the plant label, the drawing is correct.

Question 18

A switching program operation requests you to operate the incoming transformer feeder circuit breaker on the 440V Stockout Switchboard (being circuit 27),what label would you expect next to it?

Accepted Answer

S440SO.27

Answer

S11SO.27

Answer

CD11SO.27

Answer

S11ST.27

Question 19

How do you identify possible hazards in the switching that you are about to conduct?

Accepted Answer

Conduct a job risk analysis in the form of a Synergy Take 5 or safe work method statement as appropriate

Answer

Ask an experienced safety officer about any possible hazards.

Answer

Look up a previous switching program for the type of isolation being performed.

Answer

Check the switching program notes for any known hazards.

Question 20

Whilst carrying out a Switching Program or simple isolation, you find a problem that prevents you from completing the next step; What action would you take?

Accepted Answer

Stop what you are doing and report the status to the program controller & PTW issuing officer & seek assistance.

Answer

Return the switchgear to its original status before the program commenced.

Answer

Call out a technician to fault find and fix the problem.

Answer

Ring the system operations control centre and tell them what is wrong.

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