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Cat 7

Switching test paper

Cat 7
48問 • 1年前Switching test paper
  • Emeric Rome
    • 通報

    問題一覧

  • 1

    What is the purpose of reverse operation time delay (ROTD or 3 second) handle?

    To give the time for the protection to kick in before any other operation can be done.

  • 2

    5 Checks each time you enter a S/S to operate switchgear.

    Correct S/S, Correct switch name, Current switch position is as per skedule, Check switch condition, Check earth, Check local supplies are as expected

  • 3

    Which of the following indicate an OHL is capable of closing onto a fault.

    F1H, F2V, Green triangle

  • 4

    On pole mounted switch what does the marking F2V stand for?

    Fault rated/Cat2 Fitted with any type of arcing horns or plain break contacts/V for vertically mounted.

  • 5

    What is the difference in current breaking capacity between a vertically and horizontally pole mounted switch and why?

    Vertical = 50% less current breaking capacity than horizontal.

  • 6

    If there are no markings on a pole mounted switch what is the making/breaking of the switch?

    No markings means treat as Cat3 - DEAD OP ONLY.

  • 7

    When undertaking non-routine fault switching, authorised persons shall implement three specific procedures with regard to system controllers instructions. What are they?

    1 Keep proper record of all messages passed by telephone or otherwise relating to the operation of the high voltage systems. 2 Read back to the sender of every such message relating to the operation of high voltage systems, ensuring accuracy. 3 Carry out operations instructed by the control engineer without unnecessary delay, then the implementation of the instructions shall be reported back to the control engineer as soon as possible.

  • 8

    What are safety locks used for?

    To lock off the circuit being worked on, to prevent it from being energised until ready to be restored.

  • 9

    When a circuit is isolated by means of removable links or LV fuses, what should happen to them?

    They shall be removed and kept in a safe place, commonly with the person issuing the safety document.

  • 10

    IN ORDER OF PREFERENCE, what are the 3 methods for applying the first CME?

    1 A circuit breaker for first leg work 2 A rated earth switch 3 Portable earth's.

  • 11

    What is the general, 3 stage, procedure for applying a portable earth?

    Use an approved voltage testing device to verify that the circuit is dead - Connect the earth leads to the earth end first - Connect earths to all phase conductors

  • 12

    Who in terms of AUTHORISATION, may operate a HV earthswitch or apply a CME?

    An authorised person or a competent person acting under the personal supervision of an AP

  • 13

    Who must give permission to operate a HV earthswitch or apply CME?

    The system controller

  • 14

    Who shall keep a record of the time and particulars of all HV switching?

    The system controller

  • 15

    What constitutes SWITCHING as defined in the OSR

    The operation of any device that makes or breaks a circuit including the application/removal of CMEs

  • 16

    If the spout shutters on HV switchgear are not to be used immediately what must happen to them?

    The shutters must be locked shut and the keys accessible only to an AP

  • 17

    Who gives permission for HV switching

    The system controller

  • 18

    When can HV switching take place without the appropriate authority

    In an emergency

  • 19

    Can the system controller pass a HV switching instruction via third party to the authorised switcher

    No

  • 20

    When the system controller has given permission for HV switching, how must the authorised person carry out the switching?And what must he do immediately after switching

    It must be carried out without undue.Delay and reported back to the system controller as soon as possible

  • 21

    During switching if the switch is found to show signs of distress what must be done

    No switching to take place and the system controller informed of the condition of the switchgear

  • 22

    What minimum PPE has to be worn when operating pole or structured mounted equipment

    Helmet-EyeProtection-FlashJacket-RubberGloves-Yellowinsulatedwellies

  • 23

    Is it permissible to relay HV switching instructions by hand signals

    No

  • 24

    Is it permissible to carry out HV switching after an agreed interval of time

    No

  • 25

    Where safety locks are fitted to underground mounted switchgear. How should they be fitted in terms of their subsequent possible movement

    They should be fitted so that they do not need to be removed until the circuit is being restored to service

  • 26

    What is the minimum and maximum permissible length of operating rods to be used for applying or removing a portable earth

    2440mm/8ft/2rods or double that max

  • 27

    Why is it necessary to trip test a withdrawable circuit breaker after it has been removed from service and replaced

    In order to prove the integrity of the secondary isolating contacts between the fixed portion and the moving portion of the circuit breaker.

  • 28

    What methods are available for electrically trip testing circuit breakers? And in what order of preference should they be used

    Telly control - Local trip handle - Manual operation

  • 29

    Who makes the final decision whether or not to operate HV switch live

    The holder of the Items/Schedule/ Person operating the switch

  • 30

    You are instructed to close the 'high street' switch on inspecting the switch gear.You find the labels read 'high street shops' and 'high street flats'.Which switch do you operate

    None and report back to control

  • 31

    Who gives the instruction to carry out switching operation

    The system controller

  • 32

    Once you have isolated a circuit what should you do with the safety lock keys

    Lock them in a key safe or preferably give them to the SAP in charge of the works

  • 33

    If an item of ground mounted switch gear has spring assistance to operate the switch is it classed as dependent manual or independent manual

    Independent manual

  • 34

    At hope lane S/S you have been asked to close the pulpit view switch. On inspection you find switch open with an SL and CN fitted to it.Can you close the switch

    No

  • 35

    At Despair lane SS you have been asked to remove isolation and close the Dowty View switch. On inspection you find the switch open with a SL and CN fitted to it.Can you close the switch

    Yes

  • 36

    You have been instructed to open and apply isolation to the Laurel Lane switch. What lock do you apply to the on/off mechanism after operating

    A safety lock + Caution notice

  • 37

    List three applications where you would find an x lock

    Earthing Switch, Interlock, Test access, Transformer tap changer, VT chamber

  • 38

    List one application where you would find a Z lock

    Weather shield

  • 39

    List one application where you would find a Y lock

    On/Off switch

  • 40

    You have been instructed to open the Oliver lane switch. Just before carrying out the operation. A customer enters the ss and asks when the supplies will be restored. What you do

    Stop - Ask the customer to leave the SS - Confirm right switch and right operation - Operate and record - Talk to the customer.

  • 41

    List 4 components which will be checked before operation of any pole or structured mounted airbreak switch 'underslung'

    get ans

  • 42

    List 4 pre operation checks which shall be carried out specifically for handle operated pole mounted air break switches

    Right switch, Right position, Check earthing condition, Check condition of permaly

  • 43

    With regards to ABSDs air break switch disconnectors.What does an orange triangle indicate

    Fault level in excess of making capability

  • 44

    With regards to ABSD's airbrake switch disconnectors.What does a green triangle indicate

    Fault level less than making capability.

  • 45

    The correct hierarchy for operating switch gear assets

    Remotely via remote control facilities - Remotely onsite via control panels in a different room as the switch gear being operated - Remotely via a control panel in the same room as the switchgear being operated - Remotely via an approved umbilical device or similar - Via the operating facilities on the switch game

  • 46

    Having removed a withdrawable circuit breaker from service and restored.Where must you remain when control carries out a trip test of the breaker

    Outside the building

  • 47

    Operating a schedule subject to NOP2 Is it acceptable for the local controller to issue you the instruction to carry out a switching operation at a predetermined time

    No

  • 48

    When carrying out unscheduled switching on overhead networks.Why must you never attempt to reverse an operation when closing onto a suspected fault

    The ABSD are not able to break fault current

    • What's the switch?

    What's the switch?

    Emeric Rome · 7問 · 11ヶ月前

    What's the switch?

    What's the switch?

    7問 • 11ヶ月前
    Emeric Rome

    問題一覧

  • 1

    What is the purpose of reverse operation time delay (ROTD or 3 second) handle?

    To give the time for the protection to kick in before any other operation can be done.

  • 2

    5 Checks each time you enter a S/S to operate switchgear.

    Correct S/S, Correct switch name, Current switch position is as per skedule, Check switch condition, Check earth, Check local supplies are as expected

  • 3

    Which of the following indicate an OHL is capable of closing onto a fault.

    F1H, F2V, Green triangle

  • 4

    On pole mounted switch what does the marking F2V stand for?

    Fault rated/Cat2 Fitted with any type of arcing horns or plain break contacts/V for vertically mounted.

  • 5

    What is the difference in current breaking capacity between a vertically and horizontally pole mounted switch and why?

    Vertical = 50% less current breaking capacity than horizontal.

  • 6

    If there are no markings on a pole mounted switch what is the making/breaking of the switch?

    No markings means treat as Cat3 - DEAD OP ONLY.

  • 7

    When undertaking non-routine fault switching, authorised persons shall implement three specific procedures with regard to system controllers instructions. What are they?

    1 Keep proper record of all messages passed by telephone or otherwise relating to the operation of the high voltage systems. 2 Read back to the sender of every such message relating to the operation of high voltage systems, ensuring accuracy. 3 Carry out operations instructed by the control engineer without unnecessary delay, then the implementation of the instructions shall be reported back to the control engineer as soon as possible.

  • 8

    What are safety locks used for?

    To lock off the circuit being worked on, to prevent it from being energised until ready to be restored.

  • 9

    When a circuit is isolated by means of removable links or LV fuses, what should happen to them?

    They shall be removed and kept in a safe place, commonly with the person issuing the safety document.

  • 10

    IN ORDER OF PREFERENCE, what are the 3 methods for applying the first CME?

    1 A circuit breaker for first leg work 2 A rated earth switch 3 Portable earth's.

  • 11

    What is the general, 3 stage, procedure for applying a portable earth?

    Use an approved voltage testing device to verify that the circuit is dead - Connect the earth leads to the earth end first - Connect earths to all phase conductors

  • 12

    Who in terms of AUTHORISATION, may operate a HV earthswitch or apply a CME?

    An authorised person or a competent person acting under the personal supervision of an AP

  • 13

    Who must give permission to operate a HV earthswitch or apply CME?

    The system controller

  • 14

    Who shall keep a record of the time and particulars of all HV switching?

    The system controller

  • 15

    What constitutes SWITCHING as defined in the OSR

    The operation of any device that makes or breaks a circuit including the application/removal of CMEs

  • 16

    If the spout shutters on HV switchgear are not to be used immediately what must happen to them?

    The shutters must be locked shut and the keys accessible only to an AP

  • 17

    Who gives permission for HV switching

    The system controller

  • 18

    When can HV switching take place without the appropriate authority

    In an emergency

  • 19

    Can the system controller pass a HV switching instruction via third party to the authorised switcher

    No

  • 20

    When the system controller has given permission for HV switching, how must the authorised person carry out the switching?And what must he do immediately after switching

    It must be carried out without undue.Delay and reported back to the system controller as soon as possible

  • 21

    During switching if the switch is found to show signs of distress what must be done

    No switching to take place and the system controller informed of the condition of the switchgear

  • 22

    What minimum PPE has to be worn when operating pole or structured mounted equipment

    Helmet-EyeProtection-FlashJacket-RubberGloves-Yellowinsulatedwellies

  • 23

    Is it permissible to relay HV switching instructions by hand signals

    No

  • 24

    Is it permissible to carry out HV switching after an agreed interval of time

    No

  • 25

    Where safety locks are fitted to underground mounted switchgear. How should they be fitted in terms of their subsequent possible movement

    They should be fitted so that they do not need to be removed until the circuit is being restored to service

  • 26

    What is the minimum and maximum permissible length of operating rods to be used for applying or removing a portable earth

    2440mm/8ft/2rods or double that max

  • 27

    Why is it necessary to trip test a withdrawable circuit breaker after it has been removed from service and replaced

    In order to prove the integrity of the secondary isolating contacts between the fixed portion and the moving portion of the circuit breaker.

  • 28

    What methods are available for electrically trip testing circuit breakers? And in what order of preference should they be used

    Telly control - Local trip handle - Manual operation

  • 29

    Who makes the final decision whether or not to operate HV switch live

    The holder of the Items/Schedule/ Person operating the switch

  • 30

    You are instructed to close the 'high street' switch on inspecting the switch gear.You find the labels read 'high street shops' and 'high street flats'.Which switch do you operate

    None and report back to control

  • 31

    Who gives the instruction to carry out switching operation

    The system controller

  • 32

    Once you have isolated a circuit what should you do with the safety lock keys

    Lock them in a key safe or preferably give them to the SAP in charge of the works

  • 33

    If an item of ground mounted switch gear has spring assistance to operate the switch is it classed as dependent manual or independent manual

    Independent manual

  • 34

    At hope lane S/S you have been asked to close the pulpit view switch. On inspection you find switch open with an SL and CN fitted to it.Can you close the switch

    No

  • 35

    At Despair lane SS you have been asked to remove isolation and close the Dowty View switch. On inspection you find the switch open with a SL and CN fitted to it.Can you close the switch

    Yes

  • 36

    You have been instructed to open and apply isolation to the Laurel Lane switch. What lock do you apply to the on/off mechanism after operating

    A safety lock + Caution notice

  • 37

    List three applications where you would find an x lock

    Earthing Switch, Interlock, Test access, Transformer tap changer, VT chamber

  • 38

    List one application where you would find a Z lock

    Weather shield

  • 39

    List one application where you would find a Y lock

    On/Off switch

  • 40

    You have been instructed to open the Oliver lane switch. Just before carrying out the operation. A customer enters the ss and asks when the supplies will be restored. What you do

    Stop - Ask the customer to leave the SS - Confirm right switch and right operation - Operate and record - Talk to the customer.

  • 41

    List 4 components which will be checked before operation of any pole or structured mounted airbreak switch 'underslung'

    get ans

  • 42

    List 4 pre operation checks which shall be carried out specifically for handle operated pole mounted air break switches

    Right switch, Right position, Check earthing condition, Check condition of permaly

  • 43

    With regards to ABSDs air break switch disconnectors.What does an orange triangle indicate

    Fault level in excess of making capability

  • 44

    With regards to ABSD's airbrake switch disconnectors.What does a green triangle indicate

    Fault level less than making capability.

  • 45

    The correct hierarchy for operating switch gear assets

    Remotely via remote control facilities - Remotely onsite via control panels in a different room as the switch gear being operated - Remotely via a control panel in the same room as the switchgear being operated - Remotely via an approved umbilical device or similar - Via the operating facilities on the switch game

  • 46

    Having removed a withdrawable circuit breaker from service and restored.Where must you remain when control carries out a trip test of the breaker

    Outside the building

  • 47

    Operating a schedule subject to NOP2 Is it acceptable for the local controller to issue you the instruction to carry out a switching operation at a predetermined time

    No

  • 48

    When carrying out unscheduled switching on overhead networks.Why must you never attempt to reverse an operation when closing onto a suspected fault

    The ABSD are not able to break fault current