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High Voltage Authorised Person > ME466 HV AP Revision Questions > Flashcards

ME466 HV AP Revision Questions Flashcards

Recall key facts of HV knowledge and procedures for written assessment

1
Q
  1. APC Handover should cover
A

SPEKS
Status - of HV system, Dead/Live,
Permits, Switching Schedules, Sanction for Test in force
Earths - any CME/Additional earths on system and visit
Keys - muster master keys and sign in SR
Sign - for handover in SR

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2
Q
  1. What are the Golden Rules
A

DIE CPR
Disconnect
Isolate
Earth

Cordon
Point of work identified and proved dead
Released for work by issue of PTW/SFT

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3
Q
  1. State common High voltage levels for RN/RFA platforms
A

3300V 3.3kV - AOR

4160V - T45

6600V 6.6kV - LPD/LSDA/AO

11,000V 11kV - QE

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4
Q
  1. Define high voltage
A

Greater than 1,000V ac or 1,500V DC Between 2 circuit conductors
Greater than 600V ac or 900V dc phase conductor to earth

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5
Q
  1. What are the numbers of the RN/RFA Books of Reference for High Voltage
A

BR2000(52)(1) - Operating Guidance for High Voltage Systems

BR2000(52)(2) - Guidance on HV Maintenance and Testing

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6
Q
  1. Define Permit to Work
A

A form of DECLARATION , SIGNED and GIVEN BY APC to a PERSON IN CHARGE of work to be carried out any earthed High Voltage apparatus, for the purpose of MAKING KNOWN to such person exactly what apparatus is dead, isolated from all live conductors, has been discharged and earthed and on which it is safe to work.
A PTW contains detail of WHAT WORK IS TO BE CARRIED OUT.
An APC CANNOT ISSUE A PTW to HIMSELF

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7
Q
  1. Define Switching Schedule
A

Is a FORM OF CONSENT RAISED AND ISSUED BY AN APC and CHECKED BY ANOTHER AP which shows the ORDER OF ACTIONS required to be completed to achieve the isolation an earthing necessary for THE PTW/SFT TO BECOME VALID.
IT SHOULD COVER RESTORATION.

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8
Q
  1. What Document controls HV SSOW paperwork
A

Switchboard Register and Electricity at Work Regulations 1989 which came into force 01 APR 1990

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9
Q
  1. What is regulation 14 of EAWR

When is work on/near live conductors allowable

A

a. It is UNREASONABLE in all circumstances for it to be DEAD
and
It is REASONABLE in all circumstances for him to be at work on or near it while IT IS LIVE
and
SUITABLE PRECAUTIONS (including where necessary the provision of suitable protective equipment) are taken to prevent injury

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10
Q
  1. What is the minimum IP rating for HV equipment in MMS
A

IP 56

5 - Limited ingress of dust
6 - Protected against strong jets of water

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11
Q
  1. What is the expansion rate of copper when it vaporises
A

Up to 67,000 times

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12
Q
  1. d. How many copies of an LOA
A

2
PIC
SR

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13
Q
  1. a. How many copies of Switching Schedule
A

2
APC
SR

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14
Q
  1. b. How many copies of SFT
A

3
PIC
SR
PTW Card Safe

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15
Q
  1. What are the main components of HV Protection System
A 
Fuses
Transformers (voltage & current)
Relays
Circuit Breakers
UPS System
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16
Q
  1. What is the role of an HV protection system
A

Detects a fault at lowest possible level of current

Disconnect the faulty plant in shortest time to minimise damage

Discriminate to disconnect only the affected equipment and leave as much healthy equipment as possible

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17
Q
  1. c. How many copies of SFT
A

3
PIC
SR
PTW Card Safe

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18
Q
  1. c. How many copies of IC
A

3
PIC
SR
PTW Card Safe

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19
Q
  1. Define HV Live
A

Used to inform personnel that the ship is either generating or is capable of generating HV or is connected to an external HV supply

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20
Q
  1. Define HV Dead
A

Used to inform personnel that the ship is no longer capable of generating HV and all sources of HV supply are disconnected & isolated with CME’s applied

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21
Q
  1. Define HV Safe
A

Used to inform personnel that a particular compartment/area is safe to enter with all forms of HV power source disconnected and the appropriate Decay Time has elapsed

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22
Q
  1. Define CME
A

Circuit Main Earth - an earth which is positively applied and locked secure in position before a PTW or SFT is issued

23
Q
  1. Define Additional Earth
A

An earth connection applied to electrical apparatus after a CME has been applied and is recorded on the PTW/SFT

24
Q
  1. Define a temporary or comfort earth
A

An earth connection applied to electrical apparatus after a CME by the PiC and not formally recorded in the PTW/SFT

25
Q
  1. Why is it not safe to touch HV equipment the moment it is disconnected
A

Disconnected does not include security ot the disconnection and earthing of the apparatus. The equipment is not safe to touch until it is properly ISOLATED and EARTHED and proved dead to allow a PTW to be issued.

26
Q
  1. What must be done to make HV equipment safe to work on
A

Golden Rules
Disconnect
Isolate
Earth

Cordon
Permit

27
Q
  1. What must be done to make HV equipment safe to work on
A

Golden Rules
Disconnect
Isolate
Earth

Cordon
Permit

28
Q
  1. Who on board has overall responsibility for the HV SSOW
A

Authorising Engineer (AE)

29
Q
  1. Who on board should issue a SS/PTW/LOA/IC and SFT
A

Authorised Person in Charge (APC)

30
Q
  1. What steps should the PiC take if he has to leave the point of work
A

Confirm that all persons, tools and instruments under his control have been accounted for and removed.
Warn persons under his control that it is no longer safe to work on the equipment.
Return any keys to APC
Sign Part 3 of SFT/PTW

31
Q
  1. Who exceptionally can issue an LOA in the absence of the APC
A

RN - Duty ME Senior Rate

RFA - Duty ME/SE Officer if they are at least CP and authorised to issue LOA

32
Q
  1. Who can countersign a Switching Schedule
A

Another Authorised Person

33
Q
  1. What date did the EAWR 1989 come into force
A

01 April 1990

34
Q
  1. What are the differences between a PTW & SFT
A

SFT can only be issued to an AP
SFT allows for specified earths to be removed
SFT allows for the system to be electrically charged

35
Q
  1. What is the procedure for using a Potential Indicator
A

Draw PI and PU and check both have same serial number and are in date for calibration.
Connect earth lead to PI and confirm that display initiates.
Connect earth lead to good earth point to be used when proving dead.
Check PU operates by briefly pressing button
Holding PI by the handle and PU earth stud on another earth - connect PI tip to PU test point
Press PU button and confirm PI displays correct voltage
Without disturbing the PI earth connection test the HV apparatus and confirm by the PI display that the voltage is zero
Without disturbing the PI earth connection - replace the PU stud on earth and re-test the PI by connection to the PU and pressing the button.

36
Q
  1. List the contributory factors of the severity of an electric shock
A 
Body Resistance
Type of voltage (AC or DC)
Level of voltage
Frequency of voltage
Time
37
Q
  1. What are the safe working distance zone names and the distance for 6.6kV
A

Live Working Zone - 120mm

Vicinity Zone - 1120mm

38
Q
  1. What colour are BUSBAR /INCOMER/INTERCONNECTOR and FEEDER Shutters
A

BUSBAR - Red
INCOMER - RED
INTERCONNECTOR - RED
FEEDER - YELLOW

39
Q
  1. What colour padlock do you lock BUSBAR /INCOMER/INTERCONNECTOR and FEEDER Shutters and CME’s with
A 
BUSBAR - Red
INCOMER - RED
INTERCONNECTOR - RED
FEEDER - YELLOW
CME - Green
40
Q
  1. What warning or caution signs do you fit to what padlocks
A

WARNING to red padlocks
CAUTION to yellow padlocks
CAUTION to green padlocks

41
Q
  1. How do you recognise an HV compartment
A

Compartment access is to be DISTINCTIVELY marked and display an HV warning sign

42
Q
  1. How may non-CP or AP’s gain access to an HV compartment
A

With an AP/CP escort or on receipt of a LOA

43
Q
  1. What items should an HV compartment contain
A 
Correct rubber matting
HV Rescue hook
First aid/CPR notice and first aid kit
Communications (2 systems) to MCR/SCC
IP rating tallies on equipment
Decay time tallies on equipment
44
Q
  1. What are the rules regarding HV keys
A 
All keys to be unique between vessels
Keys to be uniquely identified with engraved tallies
No keys shall be removed from the vessel
Duplicate keys are to be destroyed
Keys are to be mustered every 3 months
45
Q
  1. What are the rules regarding duplicate HV keys
A

Duplicate keys are to be destroyed.

In RFA’s duplicate compartment keys may be retained if they are held and mustered by AE

46
Q
  1. What are the dimensions of a 6.6kV Additional Earth
A

3 x phase leads not less than 70mm Sq copper (or equivalent (120mm sq aluminium))
Associated earth clamp having cross sectional area of not less than 35mm sq

47
Q
  1. a. Who must apply and remove a CME
A

APC

48
Q
  1. b. Who must apply and remove an Additional Earth
A

APC

49
Q
  1. c. Who must apply and remove a Comfort or Temporary Earth
A

PiC

50
Q
  1. Where is the application of a temporary earth formally recorded
A

Additional control measures on new PTW form??

51
Q
  1. What information about the application of a CME or additional earth should be recorded
A

Time of application
Specific, detailed location of earth
CME lock number

52
Q
  1. on which document should the detail of the application of a CME or additional earth be recorded
A

Switching Schedule

53
Q
  1. What is the minimum insulation resistance reading on the RN/RFA Platforms
A

AOR (3.3kV) = 4.3MOhm
T45 (4.16KV) = 5.16MOhm
AO/LPD/LSDA (6.6KV) = 7.6MOhm
QE (11vV) = 12MOhm

High Voltage Authorised Person (1 decks)

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