Practical Power Transformers Operation, Maintenance and Testing
Select Other "city & date"
Practical Power Transformers Operation, Maintenance and Testing Course
Introduction:
Because of the constant need for electricity around the world, there has been a substantial growth in the installation of high voltage distribution and transmission equipment throughout time. Because of this, it is crucial to guarantee that power systems operate dependably. It is essential that all employees who use and operate such equipment have a thorough understanding of its maintenance needs.
Course Objectives:
Upon the successful completion of this course, each participant will be able to:-
- An understanding of the fundamental theory and principles of the operation of power transformers and transformer protection
- An insight into the identification and application of transformer types
- An understanding of power transformers, oil, and oil tests and interpretation of results
- Skills on how to manage power transformer breakdowns to ensure minimum disruption
Who Should Attend?
This course is intended for Consulting engineers, Electrical contractors, and inspectors, electrical engineers and technicians, Power system engineers and technicians, Project engineers, Tradesman electricians, Utility engineers.
Course Outlines:
POWER TRANSFORMER OIL AND OIL QUALITY
- Oil contents: water, acidity, and dissolved gas
- Oil tests: dielectric breakdown, moisture, resistivity, interfacial tension, specific gravity, power factor, furan analysis
- Recovery voltage measurement test
POWER TRANSFORMER PROTECTION
- Surge protection
- Protective relaying (differential, over-current, and earth fault)
- Buchholz relay and pressure relief relay
- Thermal devices and instruments (oil temperature alarm and trip, winding temperature alarm and trip)
- TRANSFORMERS’ MAIN FUNCTIONS AND CLASSIFICATION
- Construction (shell type and core type)
- Classification and type in relation to insulation, windings, core, cooling systems, voltage level, sizing, tank and breathing action Transformer parts
POWER TRANSFORMER ELECTRICAL TESTS
AC Tests:
- Power factor tests (insulation, oil, and bushings)
- Single phase excitation current test
- Transformer turns ratio test
DC Tests:
- Insulation resistance test
- Dielectric absorption test
- Polarization index test
- Step voltage test
- Hi-pot test
AUTO-TRANSFORMERS
- Design criteria
- Specifications
GENERATOR TRANSFORMERS
- Design criteria
- Specifications
POWER TRANSFORMERS AND SAFETY
- How to install, operate and work with high voltage power transformers safely
- Earthing of HV transformers
TAPPINGS AND TAP CHANGERS
- Uses of tap changers
- Impedance variation
- Tap changer mechanisms
- On-load tap changing by reactor transition
- Diverter resistor tap changers o In tank type tap changers
- Externally mounted tap changers
- Off-circuit tap changers
- Construction of tap changers
- Control of on-load tap changers o Master/follower control
- Circulating current control
- Runaway prevention
- Moving coil regulator
- The Brentford linear regulating transformer
- Preventative maintenance guidelines
- Standards applicable to tap changers C57.131-1995
- Comparison between IEEE and IEC approaches
- TRANSFORMER THEORY
- Electrical values and their definition in a power transformer - voltage, current, number of turns, impedance, and their interrelation
PREVENTATIVE MAINTENANCE ON POWER TRANSFORMERS
- Techniques to improve life expectancy
UNIT TRANSFORMERS
- Design criteria
- Specifications
STATION TRANSFORMERS
- Design criteria
- Specifications
OPERATION OF POWER TRANSFORMERS IN A POWER SYSTEM
- Thermal performance, loading, paralleling, tap-changing, connections and vector groups