Task Force on Guidelines for In-Service Classification of
Nonceramic Insulators
(TF 15.09.04.01) - Preliminary Guidelines
Preliminary guidelines have been posted on this site as a
means of developing input from users, manufacturers and other interested
parties.
The Task Force is particularly interested in obtaining
input as follows:
- additional examples (photographs and analysis of
effects shown)
- suggestions for development of rating (assessment)
system for effects to be shown in guideline
- suggestions for format, content etc. of final guideline
Please forward all examples, suggestions, etc. to the
Chairman of the task force - Tony Carreira
At present we are able to share the following
information:
Utility (USA) Guideline: used by permission of Mr. Robert Christman of Florida Power
& Light (this guideline has been modified by the Chairman of the task force to
eliminate any references to specific manufacturers).
STRI Guideline: used by permission of Mr. Ralf Hartings of STRI
with the following comments - "This Guide has been made available by STRI,
Sweden (https://www.stri.se) to the IEEE PES TF
on "Guidelines for In-Service Classification of NCI's" for evaluation purposes
only and should not be distributed for any other purposes. No changes to or
extraction's from the Guide are allowed. The Guide is further explained in the
file 'Information for
IEEE-STRI_NCI_DamageGuide.pdf which is recommended to be
downloaded too".
Additional Specific Examples:
(click on photos to enlarge)
a) Courtesy of Mr. Jack Varner of Southern
Company
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Sheath Damage |
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Split sheath on horizontal post insulator. Insulator removed from service and replaced.
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Severe Damage |
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Damage to suspension insulator as a result of improper installation (installed upside down). Insulator removed from service and replaced.
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Seal |
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Erosion/damage at end fitting seal, insulator installed 9 years in salt marsh environment (115 kV transmission line).
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Erosion |
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Severe erosion on post insulator. |
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b) Courtesy of Mr. Bill Chisholm, Kinectrics
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Mold Growth |
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Mold growth on suspension insulator, installed approximately 9 years (courtesy of Hydro-One Network Management)
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Reduced Hydrophobicity |
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Mold growth and reduced hydrophobicity on suspension insulator, installed approximately 9 years (courtesy of Hydro-One Network Management).
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Damage |
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Damage caused by improper installation (installed backwards) after 11 months exposure to high industrial and salt contamination (230 kV).
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