Transformer Manufacturing, Repairing and Maintenance
Teacher
Debasis Sahu
Category
Certificate Courses
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Description
The primary purpose of transformer maintenance is to ensure the internal and external parts of the transformer and accessories are kept in good condition and able to operate safely at all times. A secondary and equally essential purpose is to maintain a historical record of the condition of the transformer. Transformer maintenance can be done periodically or as condition based maintenance.
Course Objectives
- Understand the concept of mutual inductance
- Understand the operation of ideal transformers.
- Use equivalent circuits to determine voltages and currents.
- Analyze the operation of the transformer for different transformation ratios.
- Understand the concept of a reflected load in a transformer and its application in impedance matching.
- Study the application of transformers in electrical energy distribution and power supplies.
Learning Outcomes
- Carry out an inspection: To ensure equipment is under healthy state with and to detect any types of faults.
- Perform testing activity: for any suspicious inspection testing of the system to be done to detect any faults or working conditions of the equipment.
- Repair, Overhaul, and delivery of tested distribution transformer:Carrying out repair and maintenance activity in damaged distribution transformer and ensure the overall health of the distribution transformer
- Design different parts of the transformer
- Assemble different parts of the transformer and carry out pre and post-manufacturing tests.
Course Syllabus
Module 1: Use Basic Health & Safety practices with power-related work
Practice- To study uses of PPE equipment during worksite e.g. safety helmet, belt, shoes, protective glasses, earth rod, etc.
Practice - To understand basic health and safety practices covering CEA safety regulations 2010, issue of a permit to work, etc
Practice- Information to the relevant authority for any abnormal situation/behavior of any equipment’s
Practice- To understand Safety practices with power-related work
Module 2: Basics Of Electricity
Practice- Identify Basic fundamentals of Electricals
Practice - Carry out Transformer Fundamentals under-standing of schematic drawings of various equipment’s used in a distribution substation, and drawing of Single line diagrams and layout plans
Module 3: Basics of transformer operation
Practice: Introduction of the transformer, types of the transformer (based on voltage, coil, etc...).
Practice: Demonstration on transformers (laminated core, windings, insulating materials, transformer oil, tap changer, oil conservator, and breather).
Practice: Identification of HT & LT side/winding/terminals of three phase transformer
Module 4: Testing and Inspection of Faults in Distribution Transformer
Practice- Identify and carry out voltage and current transformation ratios
Practice- Demonstration on Details and function of transformer auxiliaries: tap changer, explosion vent, oil temperature indicator, conservator, silica gel, breather etc
Practice- Monitoring of transformer performance and auxiliaries monitoring
Practice- Inspect all required grounding and shorting connections, perform the insulation-resistance test
practice- Identification of ht & lt side/winding/terminals of the three-phase transformer and oil test of a three-phase transformer.
Module 5: Repair, overhaul, and delivery of test distribution transformer
Practice- Identify and Repair activity and assembling overhaul of distribution transformer standard procedures, refer maintenance manual and circuit diagram
Practice- Demonstrate repair and maintenance compliance stated in the standard procedure manual in the organization and the general requirements of standards and 5S
Practice- Ensure complete transformer with its components are fitted and packed in its original shape
Practice- Energize distribution transformer at NOLOAD only and checked for any abnormalities for the next 4 hours
Practice- carry out Open circuit & short circuit test on three phase step-up or step-down transformer and predetermination of (i) efficiency and regulation (ii) calculation of parameters of equivalent circuit)
Practice- identify Polarity test of a three phase transformer in star-star, star-delta, delta-delta & delta-star connection.
Module 6: Maintenance of three phase transformer
Practice - Complete repair of 16/25 KVA distribution transformer
Practice - Demonstrate repair and maintenance compliance stated in the standard procedure manual in the organization and the general requirements of standards and 5S
Practice- Identify common hazard, Storage of flammable materials and oils safely
Practice - Recognize any abnormalities in the system installed, alarms, noticing parameters
Practice- Ensure complete transformer with its components are fitted and packed in its original shape.
Projects
Reference Books:
1) Operation and Maintenance of Transformers HAND BOOK by H.N.S. GOWDA
2) The Performance and Design of Alternating Current Machines by M.G.Say
Session Plan
Session 1
To study uses of PPE equipment during worksite e.g. safety helmet, belt, shoes, protective glasses, earth rod, etc.
Session 2
To understand basic health and safety practices covering CEA safety regulations 2010, issue of a permit to work, etc
Session 3
Information to the relevant authority for any abnormal situation/behavior of any equipment.
Session 4
To understand Safety practices with power-related work.
Session 5
Identify Basic fundamentals of Electricals.
Session 6
Carry out Transformer Fundamentals, understanding of schematic drawings of various equipment’s used in a distribution substation, and drawing of Single line diagrams and layout plans
Session 7
Introduction of the transformer, types of the transformer (based on voltage, coil, etc...)
Session 8
Demonstration on transformers (laminated core, windings, insulating materials, transformer oil, tap changer, oil conservator, and breather).
Session 9
Identification of HT & LT side/winding/terminals of three phase transformer.
Session 10
Identify and carry out voltage and current transformation ratios.
Session 11
Demonstration on Details and function of transformer auxiliaries: tap changer, explosion vent, oil temperature indicator, conservator, silica gel, breather etc.
Session 12
Monitoring of transformer performance and auxiliaries monitoring.
Session 13
Inspect all required grounding and shorting connections, perform the insulation-resistance test.
Session 14
Identification of HT & LT side/winding/terminals of the three-phase transformer and oil test of a three-phase transformer.
Session 15
Identify and Repair activity and assembling overhaul of distribution transformer standard procedures, refer maintenance manual and circuit diagram.
Session 16
Demonstrate repair and maintenance compliance stated in the standard procedure manual in the organization and the general requirements of standards and 5S.
Session 17
Ensure complete transformer with its components are fitted and packed in its original shape.
Session 18
Energizing distribution transformer at NOLOAD only and checking of any abnormalities for the next 4 hours.
Session 19
Carrying out of the Open circuit & short circuit test on three phase step-up or step-down transformer and predetermination of
(i) efficiency and regulation
(ii) calculation of parameters of equivalent circuit
Session 20
Conducting the polarity test of a three phase transformer in star-star, star-delta, delta-delta & delta-star connection.
Session 21
Complete repair of 16/25 KVA distribution transformer.
https://www.youtube.com/watch?v=Kg2h2ltRjII
Session 22
Demonstrate the maintenance compliance stated in the standard procedure manual in the organization and the general requirements of standards and 5S.
Session 23
Identify common hazard, Storage of flammable materials and oils safely.
Session 24
Recognize any abnormalities in the system installed, alarms, noticing parameters.
Session 25
Performing all types of tests in a transformer.
Session 26
Assignment
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