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Technician Distribution Transformer Repair- Curricullum\Syllabus

Author:Asha|May 15th, 2019

This course encompasses 4 out of 4 National Occupational Standards (NOS) of “Technician- Distribution Transformer- Repair” Qualification Pack issued by “Power Sector Skill Council”.

Sr.No. Module  Key Learning Outcomes  Equipment Required 
1 Introduction
Theory Duration (hh:mm) 08:00 Practical Duration (hh:mm) 00:00 Corresponding NOS Code PSS/N 3005
  • Power sector scenario including generation, transmission, and distribution scenario of India.
  • Functions of Power Distribution Companies
  • Elements of power systems, transmission, distribution and generations. 
  • Familiarization with distribution network from substation to end consumer
2 Organizational context Theory Duration (hh:mm) 04:00 Practical Duration (hh:mm) 00:00 Corresponding NOS Code PSS/N 3005
  • Organization structure and reporting levels 
  • Duties and responsibilities of Technician (Distribution transformer repair) and career progression 
  • Relevant Legislation, Electricity act 2003, CERC,SERC
3 Basics Of Electricity
Theory Duration (hh:mm) 12:00
Practical Duration (hh:mm) 04:00
Corresponding NOS Code PSS/N 3005
  • Basic fundamentals of Electricals 
  • Transformer Fundamentals 
  • Under-standing of schematic drawings of various equipment’s used in distribution substation, 
  • Single line diagrams and layout plans
Voltmeter,Ammeter, Wattmeter, basic components, etc.
4 Testing and Inspection of Faults in Distribution Transformer
Theory Duration (hh:mm) 32:00 Practical Duration (hh:mm) 80:00
Corresponding NOS Code PSS/N 3005
  • Transformer fundamentals-working principle, EMF build up & other physical fundamental’s 
  • voltage and current transformation ratios 
  • Parts /components in a Distribution transformer 
  • Rating plate study and understand specifications 
  • Details and function of transformer auxiliaries: tap changer, explosion vent, oil temperature indicator, conservator, silica gel, breather etc. 
  • Distribution transformer workshop visit 
  • Testing parameters of distribution transformer 
  • Causes & Types of Distribution transformer failure 
  • Testing of Distribution transformer 
  • Testing of distribution transformer auxiliaries for proper functioning Inspection and maintenance schedule for transformer maintenance 
  • check list for transformer assembling and maintenance 
  • Monitoring of transformer performance and auxiliaries monitoring 
  • Keep record card which contains the basic information like serial number, diagram & rating plate mounted on the tank location. 
  • Keep running defect/repair record card which shows diagnostic record for avoiding future problems 
  • Inspect nature of faults, connections in transformer, physical condition  –
  • Inspect physical and mechanical condition visually for rust on body and on radiators. 
  • Inspect all required grounding and shorting connections, perform insulation-resistance test 
  • Failure report generation  –
  • work plan for repair activities
Screw Driver,combination plier, phase tester, digital multi-meter, clip on meter, neon etc
5 Repair, overhaul and delivery of teste distribution transformer Theory Duration (hh:mm) 27:00
Practical Duration (hh:mm) 82:00
Corresponding NOS Code PSS/N3006
  • Repair & overhaul of distribution transformer standard procedures, refer maintenance manual and circuit diagram  Repair activity and assembling 
  • Demonstrate repair and maintenance compliance stated in the standard procedure manual in the organization and the general requirements of standards and 5S 
  • record all the abnormalities and defects during repair 
  • ensure that adequate spare parts should be kept on hand to replace the faulty parts. Get issued required faulty parts from store 
  • Ensure complete transformer with its components are fitted and packed in its original shape. 
  • Take advice from the manufacturer or suppliers if any major abnormalities or defects found during repair and maintenance
  • Energize distribution transformer at NOLOAD only and checked for any abnormalities for the next 4 hours  –
  • Confirm the entire test before delivery 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)  Energize distribution transformer at NOLOAD only and checked for any abnormalities for the next 4 hours  –
  • Confirm the entire test before delivery 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)
Screw driver, combination plier, phase tester, digital multi-meter, clip on meter, neon etc
6 Use Basic Health & Safety practices with power related work
Theory Duration (hh:mm) 16:00
Practical Duration (hh:mm) 48:00
Corresponding NOS Code PSS/N 2001
  • To understand basic health and safety practices covering CEA safety regulations 2010, issue of permit to work etc. 
  • To study uses of PPE equipment’s during at work site e.g. safety helmet, belt, shoes, protective glasses, earth rod, etc.
  • Retrieve and point out documentation that refers to safety, health policy and standard 
  • Information to relevant authority for any abnormal situation/ behaviour of any equipment’s 
  • Good housekeeping practises and disposal of waste 
  • Identify common hazard , Storage of flammable materials and oils safely 
  • Possible causes of risk or accident 
  • Safe working practises when working with tools and machines 
  • Electrical safe working procedures such as Tag out, Lockout, Permit to work 
  • Recognize any abnormalities in system installed , alarms, noticing parameters 
  • Fire safety, causes and precautionary activities. Use of appropriate fire extinguishers on different types of fires 
  • Demonstrate rescue techniques applied during fire hazard, correct method to move injured people during emergency 
  • Various types of safety signs and what they mean 
  • Lift, carry and transport heavy objects, and tools, safely, using correct procedures from storage to workplace and vice versa 
  • Administer appropriate first aid to victims , bandaging heart attack, CPR, etc. 
  • Demonstrate how to free a person from electrocution
  • Respond promptly and appropriately to an accident situation or medical emergency in real or simulated environments 
  • Inform relevant authority about any abnormal situation 
  • Complete written accident report or dictate a report, send report to concern person responsible
Helmet, Gloves, rubber mat, ladder, neon tester, safety rope, first aid kit etc
7 Working effectively with others
Theory Duration (hh:mm) 21:00
Practical Duration (hh:mm) 16:00
Corresponding NOS Code PSS/N 1336
  • Working Effectively in a team
  • Demonstrate good interpersonal relation, discipline behaviour, developing a positive attitude and building self-confidence. 
  • Receiving information and instruction from supervisor and fellow workers, pass on information 
  • Assist others to maximize effectiveness 
  • Problem escalation 
  • Demonstrate responsible, disciplined behavior’s at workplace
  • Display appropriate communication etiquette while working 
  • Communication And Writing Skills and their importance 
  • Basic Computer application
Total Duration
Theory Duration 120:00
Practical Duration 230:00
Unique Equipment Required: Distribution transformer, Screw driver, Phase tester, Spanner set, Combination plier, neon tester, Digital multi-meter


Grand Total Course Duration: 350Hours, 0 Minutes

(This syllabus/ curriculum has been approved by POWER SECTOR SKILL COUNCIL)


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