This course covers the theory, operation, maintenance and testing of power transformers and auxiliary equipment. Topics included are transformer fundamentals, transformer ratings, transformer cooling, nitrogen gas systems and insulation systems. The source concludes with in-depth discussions on transformer testing techniques. This course is applicable to technicians and engineers who need a sound understanding of power transformer operation and maintenance.

Students will learn safe and proper maintenance and testing procedures on pad-mounted, power transformers. The course covers transformers used in commercial and industrial power distribution systems, including oil and dry-type units. Larger power transformers used in utility applications are also covered.

Load and no-load tap changer maintenance, ac and dc testing, routine inspections and oil sampling and testing are covered in detail. Students will learn how to perform routine oil tests, and understand how to perform the major tests that are required. A variety of electrical test equipment from various manufacturer’s will be discussed.

By the end of this training course, participants should be able to:

• Power distribution Transformer operation and construction.
• Electrical transformer types.
• Power Transformers characteristics
• Voltage Regulation and Efficiency
• Power Transformers construction Testing & Inspection.
• Core and Winding construction Testing & Inspection.
• distribution Transformer accessory Testing & Inspection.
• Electrical transformer protection Testing & Inspection.
• Oil transformer Testing & Inspection.
• Test of distribution Transformer
• Mechanical and Electrical Testing & Inspection.
• Distribution Transformer DC tests
• Distribution Transformer AC tests

This training course is suitable to a wide range of professionals but will greatly benefit for:

• Electrical Engineers
• Electrical Supervisors
• Maintenance Technicians

This interactive training course includes the following training methodologies as a percentage of the total tuition hours:

• 35 % Class room  Lectures
• PowerPoint
• Projector and white board
• 65 % In-Class exercise works and Practical Sessions (Simulation Software / Practical Exercises )
• Individual & Group Exercises
• Simulation
• Case Studies

Module One:

• Pre-test
• Power system components
• Importance of Transformer in power system
• Voltage levels for low , Medium and High
• Types of Transformer

• Distribution
• Power
• Instrument
  • Transformer coils connection
• Delta
• Star
• Open Delta Configuration
  • Fundamentals of Power, Distribution & Transformers protection
  • Transformer Design and specifications and selection basis.
  • Include overview for purpose and theory of special transformers (Galvanic isolated and Scott T)
  • Transformer Operation
  • Types of Magnetic field

• Stationary
• Rotating
• Pulsating
  • Transformer component
• Magnet wires & bars of transformer
• Coil / Winding Connections
• Transformer Core-type
• Transformer Shell-type
• Transformer Core lamination
• Bushing
• Oils
• Gauges (Level, Temp., Pressure,…..)
• Silica Gel Breathers
• Overpressure Devices
• Buchholz relay
• Bushings, Insulators, and surge arrestor

Module Two:

• Transformers losses and efficiency
• Transformer types based on functionality, size, coolers, insulation.
• Transformer Impedance basis and related design aspects
• Power transformers loading limitation & related factors
• Parallel Operation of transformer
• Load control sharing of Transformer
• Tap Changers principle, mechanism and Voltage Control
• Idea of operation Tap changer
• Types of Tap changer

• Online Tap changer
• Off Line Tap changer
  • Transformer cooling
  • Types of Transformer Cooling
• Self-air cooled Transformer
• Forced Air Cooled Transformer
• Oil-Immersed Self cooled Transformer (ONAN)
• Oil-Immersed forced air cooled Transformer (ONAF)
• Oil-Immersed Forced water cooled forced Transformer (OFWF)

Module Three:

• Oil of Transformer
• Oil Characteristics
• Oil testing

• IEC
• ASTM
  • Oil Maintenance
  • Oil Quality Index and the Breakdown Voltage Test
  • Maintenance definition

• Types

• Run to Fail maintenance
• Preventive Maintenance PM
• Corrective Maintenance CM
• Predictive Maintenance
• Improvement maintenances
  • Troubleshooting definition
  • Troubleshooting electrical procedure

Module Four:

• Electrical Power Transformers Oil PM
• Electrical Power Transformers Predictive Maintenance
• Electrical Power Transformers Corrective Maintenance CM
• Electrical Power Transformers Overhauling
• Electrical Power Transformers insulation test
• Oil PM & Dissolved Gas Analysis
• Transformer bushing
• Transformer radiator
• Transformer winding PM
• Transformer Predictive Maintenance
• Transformer Corrective Maintenance CM
• Transformer Overhauling
• insulation test

Module Five:

• Tan Delta
• Transformer Ratio Test
• Double induced Voltage
• Thermography analysis
• Transformer Noise Suppression
• Internal Transformer Defects
• Electrical characteristics of Transformer Insulating Oil
• The process of regeneration/reclamation includes the following:
• Physical-Chemical Regeneration and Dehydration of Transformer Insulating Oil
• Restoration of all physical, chemical and electrical oil characteristics

Rectus attendance certificate will be issued to all attendees completing minimum of 80% of the total course duration.