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Technician Distribution Transformer Repair- Assessment Criteria

Author:Asha|May 16th, 2019

Annexure : Assessment Criteria

Assessment Criteria for Technician –Distribution Transformer Repair
Job Role Technician –Distribution Transformer Repair 
Qualification Pack PSSC/Q 3003, v1.0
Sector Skill Council Power


Sr.No. Guidelines for Assessment 
1 Criteria for assessment for each Qualification Pack will be created by the Sector Skill Council. Each Performance Criteria (PC) will be assigned marks proportional to its importance in NOS. SSC will also lay down proportion of marks for Theory and Skills Practical for each PC
2 The assessment for the theory part will be based on knowledge bank of questions created by the SSC.
3 Individual assessment agencies will create unique question papers for theory part for each candidate at each examination/training centre (as per assessment criteria below)
4 Individual assessment agencies will create unique evaluations for skill practical for every student at each examination/training centre based on these criteria
5 To pass the Qualification Pack, every trainee should score a minimum of 70% in every NOS
6 In case of successfully passing only certain number of NOS’s, the trainee is eligible to take subsequent assessment on the balance NOS’s to pass the Qualification Pack


Assessable Outcome Assessment Criteria Total Marks 600 Marks Allocation
Out Of  Theory  Skills Practical
1. PSS/N3005 Testing and inspection of faults in Distribution transformer PC1. Maintain a record card which contains the basic information of a DT like serial number, diagram, rating plate and other related aspects 100 4 1 3
PC2. Maintain defect/repair record card which shows diagnostic records to assess the DT performance history 4 1 3
PC3. prepare check list of parameters to be kept into consideration while doing testing and inspection of distribution transformer 4 2 2
PC4. checking general appearance and leakage of oil to identify visual faults 2 0 2
PC5. identify the nature of fault and damage of part/ component 5 2 3
PC6. disconnect the winding connections from terminal bushing and earth connection between core and tank before lifting. 3 0 3
PC7. inspect physical condition visually for rust on body and on radiators 3 0 3
PC8. verify correct connections of HT/LT side 5 2 3
PC9. inspect bolt/lugs and solder of electrical connections 4 1 3
PC10. inspect all required grounding and shorting connections, perform insulation-resistance test 5 2 3
PC11. check the oil level in oil cap under silica gel breather 4 2 2
PC12. check Bushing collar, gaskets and gaskits joints for any leakage of oil. 4 0 4
PC13. check breathing holes in silica gel breather 4 0 4
PC14. inspect color of silica gel in breather 4 0 4
PC15. check condition of OLTC 5 2 3
PC16. check leakage from gasket, gasket joint and flanges (Repeat) 4 0 4
PC17. inspect porcelain insulator bushing for any damage, flash and hair crack 4 0 4
PC18. identify faults arising due to: primary Winding burnt (one phase, two phase or complete), braze /solder of LT winding joints melted, over heat, open circuit in internal wiring etc. 5 2 3
PC19. detect/ trouble shooting of excess humming noise due to loose fitting of silicon mixed steel alloys laminated core joints 4 1 3
Total 100 22 78
2.PSS/N300 6 Repair, overhaul and delivery of tested distribution transformer PC1. demonstrate repair and maintenance compliance stated in the standard procedure manual 100 3 1 2
PC2. refer maintenance manual and circuit diagram 2 1 1
PC3. ensure all required tools and kits are in good condition 2 0 2
PC4. check that all testing kits are calibrated 2 1 1
PC5. record all the abnormalities and defects during repair 2 1 1
PC6. prepare work area as per standard repair procedure 2 1 1
PC7. ensure that adequate spare parts should be kept on hand to replace the faulty parts. 2 0 2
PC8. take oil samples from tank bottom, tank top and radiator for checking of Break-Down Voltage (BDV) test 3 1 2
PC9. remove core and windings from the tank for visual inspection 1 0 1
PC10. ensure core and winding in proper cover, dry and safe place after removal from tank 1 0 1
PC11. check status of core, primary winding, secondary winding, primary terminal connections, secondary terminal connections, insulation (fish paper, empire tape/cloth, wooden spacers, tags etc) 1 0 1
PC12. identify nature of fault and carry out repair and replacement 3 1 2
PC13. place complete core and winding block for heat treatment in vacuum chamber 1 0 1
PC14. maintain voltage within prescribed limits by the use of an Off-Circuit Tap Selector (OCTS) 2 1 1
PC15. test for variation appearing in the primary side supply voltage and the secondary side supply voltage 2 1 1
PC16. check insulation resistance by Megger 2 1 1
PC17. check all loose bolts / screws / clamps, tighten the core joints, solder HT and LT terminal connections 2 0 2
PC18. check and ensure that no sludge has been deposited on winding to block the oil ducts and opening passage 1 0 1
PC19. check indoor and outdoor bushings for oil leakage and cracks or any other defects, replace the defective bushing 2 0 2
PC20. check cooling radiators for any oil leakages along all the welded joints, gasket joints and plugs. Rectify the same from the radiators 2 0 2
PC21. check and ensure clasping of the conservator 1 0 1
PC22. check and clean all the oil gauges and replace the defective oil gauges 2 0 2
PC23. check the dehydrating breather and replace if saturated and color has changed 3 1 2
PC24. check that no foreign items have been left in the tank 1 0 1
PC25. repair oil leakage and sweating. Top- up oil as per instruction stated in the manual 2 1 1
PC26. check pressure release device and explosion vent 2 0 2
PC27. check sealing gaskets for cracks, tight nut and bolts and replace damage gaskets. 2 0 2
PC28. check oil level in conservator tank gauge and thermometer 2 0 2
PC29. check OLTC switch for arcing welding and wearing and replace repair defective parts 2 0 2
PC30. check and clean the radiator with compressed air or water 1 0 1
PC31. check arcing horns for dent, welds or any defect and replace the same if found defective 1 0 1
PC32. check for any rust and damage of paint for external tank 1 0 1
PC33. check oil temperature indicator (OTI) and winding temperature indicator (WTI) 2 1 1
PC34. check air-release plugs of main tank, radiator, conservator, bushings, etc., are free of air pocket / bubbles 2 0 2
PC35. energize distribution transformer at NO-LOAD only and checked for any abnormalities for the next 4 to 8 hours 4 2 2
PC36. take advice from the manufacturer or suppliers if any major abnormalities or defects found during repair and maintenance 5 2 3
PC37. ensure complete transformer with its components are fitted and packed in its original shape 3 1 2
PC38. confirm all the tests are done before delivery. All the test relevant to the performance of DT and ensure basic parameters like Physical: leakage, low oil, silica in breather, HV & LV bushing. Electrical: IR value (HT to E, LT to E, HT to LT, oil BDV) 4 2 2
PC39. ensure vent pipe is sealed with aluminum foil (diaphragm), temperature gauge is fitted and all HV terminals are fitted with horn and double screws and washers 1 0 1
PC40. check list before delivery: oil level, No leakage of oil, tap position, silica gel in breather, radiator valve, thermometer packet, earth connection 3 1 2
PC41. ensure that the inspected and tested component meets the specified operating conditions before issue of OK certificate 4 2 2
PC42. anticipate problems well in advance in order to rectify timely 3 1 2
Total 100 26 74
3. PSS/N2001 Use basic health and safety practices for power related work PC1. use protective clothing/equipment for specific tasks and work conditions 100 3 0 3
PC2. state the name and location of people responsible for health and safety in the workplace 2 0 2
PC3. state the names and location of documents that refer to healthand safety in the workplace 2 0 2
PC4. identify job-site hazardous work and state possible causes of risk or accident in the workplace 3 1 2
PC5. follow electrical safe working procedures such as Tag out/Lock out and display PTW (Permit To Work), 3 1 2
PC6. follow warning signs (danger, out of service, etc.) while working with electrical systems 3 1 2
PC7. use standard safe working practices when working at heights, confined areas and trenches 3 1 2
PC8. test any electrical equipment and system using insulated testing devices before touching them 3 1 2
PC9. ensure positive isolation of electrical equipment & system as per given standards 3 1 2
PC10. recognize any abnormalities in electrical equipment or system installed alarm annunciation and/or noticing parameters from gauge/ indicator installed 3 1 2
PC11. carry out safe working practices while dealing with hazards to ensure the safety of self and others 3 1 2
PC12. state methods of accident prevention in the work environment of the job role 2 0 2
PC13. state location of general health and safety equipment in the workplace 2 0 2
PC14. inspect for faults, set up and safely use of scaffolds and elevated platforms and ladder 2 0 2
PC15. lift, carry and transport heavy objects & tools safely using correct procedures from storage to workplace and vice versa 2 1 1
PC16. inspect Grid station and its equipment routinely for any signs of oil and water leakage 2 0 2
PC17. store flammable materials and machine lubricating oil safely and correctly 2 0 2
PC18. check that the emission and pollution control devices are working properly in line with environmental policy standards 3 1 2
PC19. apply good housekeeping practices at all times 3 1 2
PC20. identify common hazard signs displayed in various areas 2 0 2
PC21. retrieve and/or point out documents that refer to health and safety in the workplace 2 0 2
PC22. inform relevant authorities about any abnormal situation/behavior of any equipment/system promptly 3 0 3
PC23. use the various appropriate fire extinguishers on different types of fires correctly 2 1 1
PC24. distinguish types of fire 3 1 2
PC25. demonstrate rescue techniques applied during fire hazard 3 1 2
PC26. demonstrate good housekeeping in order to prevent fire hazards 3 1 2
PC27. demonstrate the correct use of a fire extinguisher 3 1 2
PC28. demonstrate how to free a person from electrocution 3 1 2
PC29. administer appropriate first aid to victims where required e.g. in case of bleeding, burns, choking, electric shock, poisoning etc. 3 0 3
PC30. demonstrate basic techniques of bandaging 3 1 2
PC31. respond promptly and appropriately to an accident situation or medical emergency in real or simulated environments 3 1 2
PC32. perform and organize loss minimization or rescue activity during an accident in real or simulated environments 3 1 2
PC33. administer first aid to victims in case of a heart attack or cardiac arrest due to electric shock, before the arrival of emergency services in real or simulated cases 3 1 2
PC34. demonstrate the artificial respiration and the CPR Process 3 1 2
PC35. participate in emergency procedures Emergency procedures: raising alarm, safe/efficient, evacuation, correct means of escape, correct assembly point, roll call, correct return to work 3 1 2
PC36. complete a written accident/incident report or dictate a report to another person, and send report to person responsible 3 1 2
PC37. demonstrate correct method to move injured people and others during an emergency 3 1 2
Total 100 24 76
4. PSS/N1336 Work effectively with others PC1. accurately receive information and instructions from the supervisor and fellow workers, getting clarification where required 100 10 3 7
PC2. accurately pass on information to authorized persons who require it and within agreed timescale and confirm its receipt 10 3 7
PC3. give information to others clearly, at a pace and in a manner that helps them to understand 10 3 7
PC4. display helpful behavior by assisting others in performing tasks in a positive manner, where required and possible 10 3 7
PC5. consult with and assist others to maximize effectiveness and efficiency in carrying out tasks 10 3 7
PC6. display appropriate communication etiquette while working 10 3 7
PC7. display active listening skills while interacting with others at work 10 3 7
PC8. use appropriate tone, pitch and language to convey politeness, assertiveness, care and professionalism 10 3 7
PC9. demonstrate responsible and disciplined behaviors at the workplace 10 3 7
PC10. escalate grievances and problems to appropriate authority as per procedure to resolve them and avoid conflict 10 3 7
Total 100 30 70
Grand Total 400 102 298



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