Electricity + Control

This workshop is accredited by the Southern African Asset Management Association (SAAMA) with 3 CPD points. Accreditation Ref: No: SAAMA 00561

SOLE PROPRIETOR: M.M.BOTHA (Thys)

15 – 17 March 2017, Birchwood Hotel, Boksburg, South Africa

Course Synopsis:

TrainingTransformers are very reliable devices and can provide service for a long time if regularly maintained. Modern transformers and switchgear are much more efficient than they were half a century ago but are subjected to more power dips and harmonic distortion than before. Transformer failures, when they occur, are usually of a very serious nature and require costly repairs and long downtime. The best policy against transformer failure is to ensure that transformers are properly operated and maintained. For all practical purposes transformer life expectancy beyond 20 years significantly depends on the quality of maintenance applied to it.

This course focuses on critical issues that should be considered in establishing good operating practices and implementing an effective transformer and switchgear maintenance program. It provides very practical guidance for maintenance scheduling, operational and testing procedures to achieve long service life of power and distribution transformers and switchgear.

Learning outcomes:

• Learn about transformer construction, critical transformer parameters, operating conditions and how to control aging accelerators to ensure long life of transformers
• Know how to select switchgear for your application
• Understand underlying causes of transformer and switchgear failures, how to investigate and prevent failures through various testing techniques and how to interpret test data
• Explore various maintenance strategies, technical and organisational aspects of maintenance and maintenance activities that would ensure an effective transformer and switchgear maintenance program
• Discuss testing procedures, various case studies and a typical maintenance schedule through an interactive workshop
• Understand factory and site acceptance testing

Transformer Operation, Testing and Maintenance

DAY ONE

Session 1
Design fundamentals
Types of transformers
Nameplate data
Transformer terminal markings
No-load current and impedance
Transformer characteristics

Session 2
Transformer core construction
Transformer coil construction
Transformer insulation systems
Transformer cooling systems
Tanks, bushings and terminations

Session 3
Off power tap changer configurations
Power on tap changers
On Load tap changers
Tests on tap changers
Transformer vector groups

Session 4
Operating limitations
Core loss
Flux density and core heat losses
Copper loss
Relationship between load and heat produced in the windings
Effects of voltage and or frequency variations
Effects of harmonics on transformer performance

 

Session 5

Transformer installation acceptance
Acceptance tests
Transformer turns ratio test
Transformer insulation power factor and tan delta test
Ac vs dc testing methods

DAY TWO

Session 6
Transformer testing
Dc winding resistance test
Insulation resistance
Ac or dc high-potential test
Polarity test
Excitation current test
Induced potential test
Insulating fluid dielectric tests
Polarisation recovery voltage test
Transformer core ground test
Partial discharge tests
Sweep frequency tests

Session 7
Oil tests
Combustible gas tests
Dissolved gas analysis
Frequency domain spectroscopy
Dielectric response and DIRANA

DAY THREE

Morning session
• Site visit to a large transformer repair shop

After lunch session
• How does moisture and acidity in the oil affect the life of a transformer discussion?
Closure of workshop

Delegates will gain a detailed appreciation of the following:

• Transformer construction, critical transformer parameters, operating conditions and how to control aging accelerators to ensure long life of transformers
• Know how to select switchgear for your application
• Understand underlying causes of transformer and switchgear failures, how to investigate and prevent failures through various testing techniques and how to interpret test data
• Explore various maintenance strategies, technical and organisational aspects of maintenance and maintenance activities that would ensure an effective transformer and switchgear maintenance program
• Discuss testing procedures, various case studies and a typical maintenance schedule through an interactive workshop
• Understand factory and site acceptance testing

Due to the interactive nature of this workshop ONLY 20 seats are available. Please book now to avoid disappointment. All delegates will receive a Certificate as well as comprehensive course documentation. Registration for this course is at 08:00 with the course starting at 08:30, lunch will be at 13:00 with the course concluding at 16:30. Please note that all timings are approximate due to interactive nature of the course.

About the presenter

M (Thys) Botha is an independent electrical machines consultant with years of experience as rotating machines specialist. He started his career at ISCOR in 1957, joined Dunswart Steel as Electrical Engineering Superintendent in 1977, later moved to GEC Machines as Divisional Director in 1984 and joined LH Marthinusen (the largest repairer of electrical machines and transformers in South Africa.) as Technical Director in 1987 until his retirement in 2006. He is currently doing consulting work for LHM, Goldfields, SAVCIO and training at a number of companies like AngloGold Ashanti, OMNIA and ESKOM.

Enquiries: Tel. +27 11 046 9102 or email kalma@platinumpeak.co.za

Contact Electricity + Control

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Name: Wendy Izgorsek
Email: ec@crown.co.za
Phone: +27 11 622-4770
Fax: +27 11 615-6108

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Name: Helen Couvaras
Email: helencou@crown.co.za
Phone: +27 11 622-4770
Fax: +27 11 615-6108

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Name: Heidi Jandrell
Email: heidij@crown.co.za
Phone: +27 11 622-4770
Fax: +27 11 615-6108

 
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