Study of the impact of degree of polymerization on the remnant life of transformer insulation

B. A. Thango, A. O. Akumu, L. S. Sikhosana, A. F. Nnachi, J. A. Jordaan

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Citations (Scopus)

Abstract

In South Africa, transformers are the most critical links in the power system's generation, transmission, and distribution. Their insulation system is comprised of dielectric oil and cellulose paper. The aging of the insulating system is influenced by several factors including high loading profile, temperature rise, and short circuits. Many diagnostic tests can be performed, and correctional measures may be taken to guarantee that consumers receive uninterrupted power supply. The remaining life of the transformer's cellulose paper insulation determines when the transformer's useful life ends. The mechanical or tensile strength of the solid insulation determines the aging of the paper insulation, which is calculated in terms of its Degree of Polymerization (DP). The direct method, which involves actual paper samples and is thus expensive and invasive, is the conventional method for calculating DP. Recently, a nonintrusive indirect approaches has been used to estimate the DP value from the furan compounds dissolved in the dielectric oil. In this work, the impact of the DP on the remnant life of four different transformer cellulose insulating materials is studied. An analysis of various cellulose insulation DP models are employed in estimating the DP and consequently the remnant life. The study further propose new formulae correlating 2-furaldehyde (2FAL) and DP in relation to the ageing process using regression analysis on a fleet of collected transformer oil samples. The results are compared with measured DP values and yield an estimation error of less than 3% and 4% respectively.

Original languageEnglish
Title of host publication2021 IEEE PES/IAS PowerAfrica, PowerAfrica 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781665403115
DOIs
Publication statusPublished - 23 Aug 2021
Externally publishedYes
Event8th Annual IEEE Power and Energy Society and Industrial Applications Society PowerAfrica Conference, PowerAfrica 2021 - Virtual, Nairobi, Kenya
Duration: 23 Aug 202127 Aug 2021

Publication series

Name2021 IEEE PES/IAS PowerAfrica, PowerAfrica 2021

Conference

Conference8th Annual IEEE Power and Energy Society and Industrial Applications Society PowerAfrica Conference, PowerAfrica 2021
Country/TerritoryKenya
CityVirtual, Nairobi
Period23/08/2127/08/21

Keywords

  • 2 furaldehyde (2FAL)
  • Degree of Polymerization (DP)
  • Remnant life
  • Transformer

ASJC Scopus subject areas

  • Information Systems and Management
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Electrical and Electronic Engineering
  • Industrial and Manufacturing Engineering

Fingerprint

Dive into the research topics of 'Study of the impact of degree of polymerization on the remnant life of transformer insulation'. Together they form a unique fingerprint.

Cite this