Commissioning, Inspecting, Testing and Maintenance for Low, Medium and High Voltage Electric Power
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Commissioning, Inspecting, Testing and Maintenance for Low, Medium and High Voltage Electric Power Course
Introduction:
Power equipment serves as critical assets for distribution utilities, and any failures in these assets can have significant economic and service-level impacts on utility operations. As the equipment ages, it becomes increasingly important to implement a program for assessing the condition and health of power equipment in service. This proactive approach helps identify potential failure risks and allows for appropriate decisions and actions to mitigate those risks, thereby preventing catastrophic failures.
There is a noticeable shift in maintenance practices among many transmission and distribution utilities, moving away from traditional calendar or time-based maintenance towards condition-based maintenance. This change in paradigm reflects the growing focus on techniques for monitoring, diagnosing, and assessing the condition of power equipment. Consequently, various non-intrusive testing techniques, both online and offline, have been developed to diagnose the health of power equipment. These techniques aim to optimize maintenance efforts and ensure maximum availability and reliability of the equipment.
Course Objectives:
This course is designed to enable participants to:
- Understand typical failure modes associated with power equipments
- Understand typically used on- and off- line diagnostic tests for condition monitoring of power equipments
- Understand the interrelationships of various on- and off- line diagnostic tests
- Understand the interpretation of test results and computation of health index
Who Should Attend?
This course is intended for junior & senior electrical and non-electrical engineers, who are involved in the operation, planning, maintenance, protection, control, and analysis of working in power utilities and industrial plants (generation, transmission, and distribution.
Course Outlines:
Transformer Theory
- Ampere-turns and energy balance
- Turns ratio
- Design fundamentals and constraints
- Leakage Reactance
- Losses
- Ratings
- Voltage regulation
- Types of transformers
- Phasor diagrams
- Connections
- Flux
- Taps
- Impedance
- Two and three winding transformers
- Autotransformers
- Zero sequence impedance
- Standards
- Oil and paper
- Core steel
- Conductors, copper and aluminum
Maintenance
- Preventive maintenance
- Reliability centered maintenance
- Condition-based maintenance
- Combination of condition-based and preventive maintenance
- Recommended standards and references
- Maintenance and test procedures
- Infrared scanning
- Fault and load flow studies/equipment ratings
- Maintenance schedules and documentation
- Safety during maintenance
Internal Transformer Construction
- Core
- Windings
- Thermal considerations
- Tap windings
- Tanks
- Drying of paper
- On load tap changers (OLTC)
- Voltage controllers
- De-energized tap changers (DETC)
- Protective devices (on transformer)
- Bushings
- Surge arrestors
- Factory test
- Field tests
- Ratio meter
- Winding resistance
- Voltage impedance
- Power factor
Operation and Maintenance of Power Transformers
- Substation layout
- Earthing
- Abnormal conditions
- Fire protection
- Parallel operation
- Maintenance of Oil Immersed Transformers Oil
- Gas in oil analysis
- Water in oil analysis
- Drying of insulation
- Gaskets
- Infra-red scans
- Maintenance and Troubleshooting Sample operating & maintenance instructions
- Drying technique
- Problem and failure investigations
- Transformer diagnostics
- Transformer troubleshooting
Circuit Breaker Diagnostic and Maintenance
- Diagnostic techniques
- Batteries condition monitoring
- Substation Maintenance Techniques Structures
- Fuses, arresters, switches
- Oil circuit breakers
- Air blast CB
- SF6 and vacuum CB