Table of Contents

1 Overview
    1.1 Scope
    1.2 Purpose
2 References
3 Definitions
4 Gases used in this guide
5 Historical background
    5.1 The need for gas-in-fluid analysis
    5.2 Historical use in transformers
    5.3 Historical application to HPFF and SCFF cable systems
    5.4 Methodology and refinements for special cases
6 Fundamentals of gas generation in cellulose and dielectric fluids
    6.1 Mechanisms of gas generation
    6.2 Rates of gas production for the various mechanisms
    6.3 Determination of gas solubility
    6.4 Dissolved gas distribution in bulk fluid
7 Application of gas analysis to cable systems
    7.1 How to apply DGA
    7.2 Number of samples and sampling locations
    7.3 Scheduling sample acquisition
8 Sampling of fluid or gas from cable systems
    8.1 Sampling objectives
    8.2 Sampling equipment
    8.3 Sources of fluid sample contamination
    8.4 Sampling conditions
    8.5 Preparation for sampling
    8.6 Sampling procedure using the syringe method
    8.7 Packaging and transport of samples
9 Analysis of fluid or gas samples
    9.1 Gas analysis by chromatography using ASTM D3612-96
    9.2 Gas analysis by other techniques
    9.3 Appearance and physical tests
    9.4 Dielectric tests
    9.5 Chemical tests
10 Reporting of results
    10.1 Data collection
    10.2 Types of data
    10.3 Method of collection
    10.4 Recording format and units
    10.5 Data presentation
11 Interpretation of results
    11.1 Interpretation of the first round of DGA data
    11.2 Changes in dissolved gas concentrations with time
12 Methods for treatment of systems with high gas content
    12.1 Treating circulated pipe cable systems
    12.2 Treating static pipe cable systems
    12.3 Treating SCFF cable systems
13 The ICC database
    13.1 Database software
14 Bibliography
Annex A (Informative) DGA Reporting forms

Abstract

Guidelines for gas-in-fluids analysis for diagnostic purposes on cable system condition, and as an operation and maintenance tool to determine when corrective action may be required.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Institute of Electrical & Electronics Engineers
Pages
ISBN