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Electrical Transformers, Malfunctions, Insulation, and Protection

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Date: 6 November 2017 - 10 November 2017
Course ID: 729/2017
Duration: 5 Days
Fee US $ + VAT: 2950 US$
Venue: Istanbul / Turkey
Category: Electrical and Electronic Engineering

Introduction:

Power transformers are considered an essential element in all electric power networks. Electric utilities and industrial companies always pay a great attention to their power transformers to ensure the continuity of their electric networks.

This Course is intended to provide advanced engineering aspects of power transformers. Emphasis shall be laid on topics relevant to power transformers selection, operation, and maintenance. A special attention will be paid to the available advanced failure prediction techniques of power transformers. These techniques include evaluation of insulation oil and generated gases. This is considered an important aid to avoid transformer failures during transmission.

Objectives:

Upon successful completion of this training program, the participants will learn:

• The power transformer construction, ratings and applications

• The Effects of transformer operation under nonlinear loads

• Different types of power transformers tests

• The importance of the Routine Impulse Test

• The methodology to evaluate the transformer insulation life

• The calculation of the transformer’s temperatures and its aging factor

• The thermal evaluation of liquid-immersed power transformers

• Interpretation of gases generated in oil-immersed transformers

• Reclamation and maintenance of insulating oil

• Investigation of transformer failure

• Power transformer maintenance

Who should attend:

The course is targeted to Senior Technicians and Engineers working in Operation, installation and Maintenance of power transformers in electric utilities and industrial companies.

Daily Outlines:

Day 1

Introduction

Transformer construction

Transformer ratings

Transformer applications



Transformer Operation under Nonlinear Loads

Nonlinear Loads

Harmonics Effects

Harmonics Sources

Effects of Harmonics

Transformer De-rating



Day 2

Types of tests

Transformer turns ratio (TTR) test

Polarity and phase-relation tests

Dielectric Tests

o ac high-potential (ac hi-pot) test

o Induced potential test

o Impulse Tests

o Insulation power factor test

o Insulation resistance tests

Polarization recovery voltage test

dc winding resistance test

No-load losses and excitation current test

Short Circuit Tests

Insulating fluid tests

Dissolved gas analysis tests



Routine Impulse Test for Power Transformers

General test procedures

Fault detection methods

Circuits for routine impulse testing

Failure detection methods



Day 3

Transformer insulation life

Aging equations

Percent loss of life



Calculation of temperatures

Load cycles

Computer calculation of loading capability

Aging factors



Day 4

Thermal Evaluation of Liquid-Immersed Power Transformers

Minimum life expectancy

Criteria for end of life

Test specimens and procedures



Interpretation of Gases Generated in Oil-Immersed Transformers

Oil Decomposition

Interpretation of Gas Analysis

Operating Procedures Utilizing the Detection and Analysis of Combustible Gases

Instruments for Detecting and Determining the Amount of Combustible Gases Present

Dissolved Gas Analysis DGA



Day 5

Reclamation and Maintenance of Insulating Oil

General Classification of Service-Aged Oils

Sources of Oil to Be Reclaimed

Criteria for Reuse of Reclaimed Oil

Types of Reconditioning and Reclamation Processes



Transformer Protection

Protection schemes

Switchgears

Coordination



Investigation of a Failure

Data Collection

` Analysis of Mechanical and Electrical Failure

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