Chapter 22. Problem and Failure Investigation

Chapter 22. Problem and Failure Investigation - 22 Problem...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 22 Problem and Failure Investigation Wallace B. Binder Consultant Harold Mo ore H. Moore and Assoc iates 22.1 Introduction ..................................................................... 22-1 22.2 Background Investigation ............................................... 22-2 Transformer Records . Transformer Protection . Recording Devices . Operational Histor y 22.3 Problem Analysis Where No Failure Is Involved .......... 22-5 Transformer Components . Severe Duty Investigations 22.4 Failure Investigations ...................................................... 22-7 Dismantling Process 22.5 Analysis of Information .................................................. 22-8 Interpretation and Analysis of Information . Analysis of Current and Voltage Waveforms . Analysis of Short-Circuit Paths . Analysis of Mechanical Stresses 22.6 Special Considerations .................................................. 22-13 Personal Injur y . Safety 22.1 Introduction The investigation of transformer problems or failures is in many respects similar to medical procedures. The health of a transformer can be monitored using the many diagnostic tools available today. Ignoring a minor problem can lead to a more severe failure. Documenting and recording the results of operation and diagnostic testing is essential to a complete evaluation. Early detection and mitigation of developing problems can, in the long term, save the cost of major repairs. Many transformer operators wi th significant numbers of transformers perform field diagnostics and share this information w ith other operators to establish benchmark performance for transformers in different applications and w ith different designs. Elements of transformer design, application, and operation are involved in failure investigation. The elements to be investigated depend on the nature and the severit y of the problem. If a failure is involved, all of the elements are usually investigated. The analyses required can be quite complex and involved. It would be impossible to describe the many details involved in complex failure investigations wit hin this one section; indeed, a complete book could be written on this subject. In the space allotted here, it will only be possible to describe the processes involved in such investigations. Excellent references are ANSI = IEEE C57.117, IEEE Guide for Reporting Failure Data for Power Transformers and Shunt Reactors on Electrical Power Systems, and ANSI = IEEE C57.125, IEEE Guide for Failure Investigation, Documentation, and Analysis for Power Transformers and Shunt Reactors. 2006 by Taylor & Francis Group, LLC. The following steps are involved in problem and failure investigations....
View Full Document

This note was uploaded on 10/19/2010 for the course ENGINEERIN ELEC121 taught by Professor Tang during the Spring '10 term at University of Liverpool.

Page1 / 14

Chapter 22. Problem and Failure Investigation - 22 Problem...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online