Real-time dynamic loading and thermal diagnostic of power transformers

A comprehensive approach to dynamic loading of power transformers is presented. It is based on the Annex G equations in the latest IEEE Loading Guide. The IEEE work is enhanced through a continuous update of rated temperatures. The algorithm was evaluated with nine transformer-months of real-time fi...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on power delivery 2003-01, Vol.18 (1), p.142-148
Main Authors: Lachman, M.F., Griffin, P.J., Walter, W., Wilson, A.
Format: Article
Language:English
Subjects:
Bushings
Cooling
Dynamics
Equations
IEC standards
Insulators
Loads (forces)
Mathematical models
Moisture
Moisture content
Oil insulation
Power transformers
Ratings
Real time
Temperature
Thermal loading
Transformers
Voltage
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A comprehensive approach to dynamic loading of power transformers is presented. It is based on the Annex G equations in the latest IEEE Loading Guide. The IEEE work is enhanced through a continuous update of rated temperatures. The algorithm was evaluated with nine transformer-months of real-time field data. Field observations and comparison with the IEEE Clause 7 and IEC thermal models are presented. Dynamic loading ratings are determined considering limitations imposed by top-oil and hottest-spot temperatures, load current and loss-of-life as defined by the IEEE for various types of loading. The rating calculations also consider temperatures of bushings, voltage, present value and historical trend of ambient temperature, preload parameters, cooling mode during the overload, moisture content in the paper, presence of bushing enclosures, and the type of oil-preservation system.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2002.803724