NTOPS-L1-01 Ops Level 1 Questions PDF

Operations Training Programme (Code- NTOPS-L1-01) Level 1 Operations Module Assessment Name: ____________________________ Staff No: _______________ Date: ____________________________ Result: ________________...

Operations Training Programme (Code- NTOPS-L1-01) Level 1 Operations Module Assessment Name: ____________________________ Staff No: _______________ Date: ____________________________ Result: ________________ Instructor: _________________________ Part 1 consists of 50 questions, 14 of those marked with a # must be correct to achieve a pass. 70% minimum pass with all 14 # questions. Part 2 is assessing your ability to create an appropriate switching plan to disconnect & earth apparatus for work. Please answer all questions: tick relevant box and write answers in clearly where required Part 1: 1. Low voltage is defined as? a) A voltage not exceeding 600 volts a.c. between phase and earth or 1000 volts between phases b) A voltage not exceeding 1000 volts a.c. between phase and earth or 1500 volts between phases c) A voltage not exceeding 900 volts a.c. between phase and earth or 1500 volts between phases d) A voltage not exceeding 600 volts a.c. between phase and earth or 1500 volts between phases. 2. What Instrument is used to carry out a polarity test? a) Earth Fault Loop Impedance Tester b) Insulation Resistance Tester c) Digital Voltmeter d) Analogue Voltmeter 3. When carrying out a polarity test what is the maximum acceptable voltage reading between neutral and the reference earth? a) 2 Volts b) 1 Volt c) 4 Volts d) 0.5 Volt ESB Network s Candidate Signature: ____________________________ Date: __________________ pg. 1  Operations Training Programme (Code- NTOPS-L1-01) Level 1 Operations Module Assessment 4. What is the maximum acceptable value of Loop Impedance without reporting or referring to a supervisor at the ESB / customer interface (Isolator)? a) 0.2  b) 2.0  c) 1.0  d) 0.5  5. In a Three phase MV to LV transformer winding configuration is? a) Primary Delta: Secondary Star b) Primary Star: Secondary Star c) Primary Star: Secondary Delta d) Primary Delta: Secondary Delta 6. An open circuit in the neutral of a single phase service to a customer with a TNCS (neutralised) earthing arrangement is most likely to result in? a) Customer’s exposed conductive parts becoming live b) Over voltage at customers premises c) Customer’s fuse blowing 7. What type of protection is a low voltage sub (transformer) fuse designed to provide? a) Overvoltage b) Short circuit c) Open circuit d) Earth fault 8. The person responsible under the ESB safety rules for assigning the PICW is? a) The system controller b) The system manager c) The person issuing work d) The work organiser ESB Network s Candidate Signature: ____________________________ Date: __________________ pg. 2  Operations Training Programme (Code- NTOPS-L1-01) Level 1 Operations Module Assessment 9. The close proximity zone radial distance for low voltage as outlined by the ESB safety rules is? a) 0.5 mtrs b) 0.3 mtrs c) 0.0 3mtrs d) 0.05 mtrs 10. The low voltage supply standard is? a) 230 volts +6%, -10% b) 230 volts +10%, -6% c) 230 volts +10%, -10% d) 200 volts to 300 volts 11. # The radial distance of close proximity to medium voltage (10 / 20kV) is? a) 0.75 mtrs b) 0.3 mtrs c) 0.03 mtrs d) 0.05 mtrs 12. The person responsible under the ESB’s safety rules for the application of local earths is? a) The operator b) The PICW c) The co-ordinator d) A crew member 13. # A hold-off notice is required at? a) Every circuit interruption device b) Every point of disconnection c) Every point of disconnection and main earth d) Every main earth ESB Network s Candidate Signature: ____________________________ Date: __________________ pg. 3  Operations Training Programme (Code- NTOPS-L1-01) Level 1 Operations Module Assessment 14. In relation to electric shock the threshold of ‘Let Go’ is in the range of for a typical individual: a) 0.5mA – 2mA b) 10 mA – 30mA c) 50 mA – 100mA d) Over 1 Amp 15. # The most likely consequence of reverse polarity for the customer is? a) Customer’s receiving electric shock. b) Customer’s overcurrent protective device operating. c) Under voltage to customer resulting in damage to appliances d) Customer’s RCD operating 16. # What is the purpose of the loop impedance test? a) To verify that impedance is low enough to allow customer circuit protective devices to operate within the specified time limits and ESB’s network is in good condition. b) To verify that impedance is low enough to operate ESB’s cut-out fuse in the event of a floating neutral c) To verify that impedance is low enough to ensure operation of the customer’s RCD within the specified time limits in the event of a fault d) To verify that impedance is low enough to ensure operation of test instruments when testing circuits 17. # List in the correct sequence the Five Golden Rules a) __________________________________________________________ b) __________________________________________________________ c) __________________________________________________________ d) __________________________________________________________ e) __________________________________________________________ ESB Network s Candidate Signature: ____________________________ Date: __________________ pg. 4  Operations Training Programme (Code- NTOPS-L1-01) Level 1 Operations Module Assessment 18. What is the minimum number of operating rods that must be used when applying main earths to open span vertical construction overhead LV network? ______________________________________________________________ 19. # The switching plan shall be prepared before any planned switching commences? True False 20. Typical earth fault current on a rural 10kV isolated neutral system is? a) 2 Amps b) 4 Amps c) 20-50 amps d) 300-600 amps 21. The advantage of the using a Faulted Phase Earthing (FPE) system over offering no protection is? a) It reduces step and touch voltage at point of fault b) It reduces resistance at point of fault c) It reduces resistance value at station earth 22. When paralleling two 38kV stations at 10kV, the trafos must be put on a Fixed Tap: a) When the normally open point is within 10km of either station b) When the distance between the two stations is less than or equal to 5km c) Transformers must be put on fixed tap at all times when paralleling 23. # If operating M.V. solid links / fuses in wet conditions when on a pole, the minimum number of operating rods to be used is? a) 3 Minimum without cowl fitted b) 2 Minimum with cowl fitted c) 1 Minimum with cowl fitted d) 2 Minimum without cowl fitted ESB Network s Candidate Signature: ____________________________ Date: __________________ pg. 5  Operations Training Programme (Code- NTOPS-L1-01) Level 1 Operations Module Assessment 24. When replacing the phase element in an S&C fuse the excess “Tail” of the phase element should be? a) Left dangling b) Put back into fuse tube c) With excess cut off d) Left untouched 25. When breaking parallel between two stations, the Load-buster should be used: a) Some of the time – weather dependent b) All the Time c) Not at all 26. Identify two scenarios from the selection where a loadbuster shall be used. a) Operating on a pole b) Operating from a hoist c) Operating on ground 27. On the 10kV isolated neutral system, one method of the detection of earth faults is by monitoring the voltage by a use of a V.T. between the neutral or star point and earth, in the event of an earth fault does the voltage between neutral and earth? a) Reduce from 6kV to some lower level, dependant on the resistance of the fault b) Increase from 0V to some higher level, dependant on the resistance of the fault c) Increase to 10kV d) Fluctuate because of the capacitance of the system 28. During an earth fault on the 20kV system the phase voltage acting on the fault is? a) 20kV approx. b) 6kV approx. c) 12 kV approx. d) 0 Volts ESB Network s Candidate Signature: ____________________________ Date: __________________ pg. 6  Operations Training Programme (Code- NTOPS-L1-01) Level 1 Operations Module Assessment 29. The objective of a switching plan is to? a) Speed up the time required to carry out switching for work b) Minimise the risk of error in switching and achieve the most effective switching sequence c) Comply with requirements of the system controller 30. # Who must be contacted before and after completing operations? a) System manager b) Person issuing work c) System controller d) Station supervisor 31. The operator in charge as defined in the safety rules, is? a) The senior operator in an area b) Nominated when there is more than one operator involved in the same switching programme c) When the person is carrying out a lot of switching d) The co-ordinator for the number of work crews 32. # As part of written request for disconnection Telemess for an overhead line by a PICW to an operator, it must include the following? a) A request for earths b) It is not necessary to mention earths, where they are not required c) It must name the point where earths are required d) A request for “Not To Be Operated Notices” ESB Network s Candidate Signature: ____________________________ Date: __________________ pg. 7  Operations Training Programme (Code- NTOPS-L1-01) Level 1 Operations Module Assessment 33. # Before checking for voltage and applying earths to an apparatus when switching for work, one of the following should apply: a) All points from which the apparatus can be made live must be disconnected b) All points from which the apparatus can be made live must be disconnected and a “hold off notices” applied c) All voltage points from which the apparatus can be made live must be disconnected and a “Do Not Operate Notice” applied d) The sequence does not matter, provided the apparatus is disconnected, earthed and held off notice applied, before issuing the proof of disconnection 34. # A Proof of disconnection is only issued by? a) A PICW b) System controller c) System Manager d) Operator 35. # When a Proof of Readiness is issued by a PICW to an operator it must include the following statement: a) All local earths under the control of the PICW are removed b) Local earths are still applied at specific locations c) Does not require a statement about local earths d) Local earth are removed but main earths are still applied at specific locations 36. Threshold voltage for a voltage detector in the voltage range of 10 – 40 kV is? a) 6kV b) 10 kV c) 12 kV d) 3 kV ESB Network s Candidate Signature: ____________________________ Date: __________________ pg. 8  Operations Training Programme (Code- NTOPS-L1-01) Level 1 Operations Module Assessment 37. # When testing and verifying for either presence or absence of voltage on live equipment one of the following applies: a) The hook or electrode must be attached to the detector and metal to metal contact is essential b) If the detector operates within close range to the apparatus the test is ok c) It is not necessary to make metal to metal contact where the conductor is insulated 38. Each voltage detector at a minimum must be tested on a live system source: a) once a day b) once a week c) once a month d) once every 3 months 39. # Before applying an earth (main or local) to a low or high voltage system neutral one of the following must apply: a) Check for absence of voltage by touching earth lead onto conductor to be earthed b) Always use voltage detector to check for absence of voltage before applying earths c) There is no specific requirement to use a voltage detector 40. # From the options below identify a suitable PPE option for the completion of a switching operation at either low or medium voltage overhead network a) Full Face Visor + One Piece Overall b) Full Face Visor + 2 Piece Overall c) Full Face Visor + Bomber Jacket + High Visibility Vest d) Full Face Visor + 2 Piece Overall + High Visibility Vest 41. A critically important symbol on arc protected PPE is: a) Two overlapping circles b) Overlapping squares c) 4kA or 7kA embroidered insignia d) Two overlapping triangles ESB Network s Candidate Signature: ____________________________ Date: __________________ pg. 9  Operations Training Programme (Code- NTOPS-L1-01) Level 1 Operations Module Assessment 42. Identify the neutral (or star) point arrangement in relationship to the station earth grid for the 20 kV winding of a 38: 20 kV transformer: a) A direct connection to the earth grid b) Isolated from the earth grid c) Connected to the earth grid through a 4 ohm resistance d) Connected to the earth grid through a 20 ohm resistance 43. Indicate by numbering 1, 2 and 3 in the boxes below the order of opening three phase S&C links / fuses to minimise voltages associated with single phasing. 44. Six significant steps can be identified when conducting a phasing sequence at an open point prior to paralleling two single phase systems, identify the sequence. 1. Measure voltage across Open Point First Phase 2. Measure voltage Side 1 3. Measure voltage across Open Point Second Phase 4. Measure voltage Side 2 5. Prove instrument 6. Prove instrument 45. # During a switch-out a PICW may only be replaced with the consent of? a) Operator b) PIW c) System controller d) System manager ESB Network s Candidate Signature: ____________________________ Date: __________________ pg. 10  Operations Training Programme (Code- NTOPS-L1-01) Level 1 Operations Module Assessment 46. When applying either main or local earths to an overhead line identify the distance 1) the earth spike must be driven at from the base of the pole and 2) “keep clear area” or exclusion zone which apply to personnel when applying the earth. 47. While conducting single phase switching of a MV three phase spur, what voltages will 3 phase customers experience when only one fuse has been opened? a) They can be subjected to a higher than normal voltages b) Voltages of all three phases in relation to the neutral will be low c) One normal voltage but two low voltages in relation to the neutral d) One low voltage and two normal voltages in relation to the neutral ESB Network s Candidate Signature: ____________________________ Date: __________________ pg. 11  Operations Training Programme (Code- NTOPS-L1-01) Level 1 Operations Module Assessment 47. # Complete a HO Notice when assigned as both Operator & PICW for your work. You may choose any work scenario. 49. If due to an earth fault on the low voltage system the voltage between phase and earth is less than the voltage between neutral and earth, this is known as? a) A floating neutral b) An incorrect polarity c) Neutral inversion d) A broken neutral ESB Network s Candidate Signature: ____________________________ Date: __________________ pg. 12  Operations Training Programme (Code- NTOPS-L1-01) Level 1 Operations Module Assessment 50. The procedure for the “phasing out” of either a 10kV or 20kV overhead line requires how many persons? a) 1 person b) 2 persons c) One on the ground and 2 on the pole d) Depends on the type of phasing kit used Part 2: 51. Using the attached network diagram please prepare a switching plan and a proof of disconnection for the following apparatus involved: a) The PICW is A.N. other b) The Operator = yourself c) *Please use attached Telemess form. ESB Network s Candidate Signature: ____________________________ Date: __________________ pg. 13