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Introduction
CIGRÉ (www.cigre.org), the Council on Large Electric Systems, calls on international experts to exchange knowledge, share best practices and join forces for the Power System of Today and Tomorrow.
CIGRE Working Group B2.47 has been formed in March 2011 to investigate the different practices of transmission line operators with regard to remedial actions for aged fittings and repair of conductors.
The terms of reference of WG B2.47 is to look at the experience with means of improving line reliability by reviewing current practice with repair and remedial action for aged fittings/conductor systems. The aim is to assist overhead line engineers to improve line reliability and restoring integrity.
Because of your position and experience, you have been identified by one of our member as a potential respondent to our questionnaire. Your cooperation would greatly help in establishing the current practices of line operators with regard to line maintenance and conductor repairs. The information provided will be treated confidentially, and will be used for statistical evaluation only. The statistical evaluation of the response is expected to be published in ELECTRA. Based on this data, we plan on using the information to develop recommendations for remedial actions for aged fittings and repair of conductors.
Filing out the questionnaire should take no more than 10 minutes. Should you have any question, or if you need assistance with the questionnaire, please contact:
M. Jean-Philippe Paradis
[email protected]
1-514-828-0057 (x228)
Canada
M. Kjell Halsan
[email protected]
47-2390-3000
Norway
Your cooperation is greatly appreciated.
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| 1/6 - IDENTIFICATION OF RESPONDENT |
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| Does your utility see a need for a guide regarding remedial actions for aged fittings and repair of conductors? |
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| Do you inspect the condition of a new line prior to commissioning? |
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| If yes, when is this inspection performed? |
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| What is the usual interval between inspections of the following line components (after initial inspection - previous question)?
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| Does your company records damage reports on a central database? |
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| 3/6 - DAMAGES TO CONDUCTOR AND FITTINGS |
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| WHEN AND WHERE ARE DAMAGES ON CONDUCTOR AND FITTINGS DETECTED? |
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| Damage to conductor accessories (excluding suspension clamps):
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| Damage to suspension clamps and insulator string fittings:
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| WHAT ARE THE PRINCIPAL REASONS FOR DAMAGES? |
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| Conductor accessories (excluding suspension clamps):
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| Suspension clamps and insulator string fittings:
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| 5/6 - EXTENT OF DAMAGES TO CONDUCTOR AND FITTINGS OVER THE LAST 5 YEARS |
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These questions apply to all existing lines, including those commissioned in the last five years.
Damage to a conductor is defined as any alteration to the strands repair.
Damage to a fitting is defined as any alteration that required the fitting to be repaired or replaced. |
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PLEASE PRIORITIZE THE FOLLOWING TYPES OF DAMAGES WITH REGARD TO THEIR FREQUENCY OF OCCURENCE ON YOUR NETWORK OVER THE LAST 5 YEARS:
(1: most often / 6: less often) |
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| Damages to conductor (all types) |
| | | Damages to suspension clamps (including clamp looseness) |
| | | Damages to dead-ends and joints |
| | | Damages to spacers / spacer-dampers (including clamp looseness) |
| | | Damages to vibration dampers (including clamp looseness) |
| | | Damages to aerial warning markers (including clamp looseness) |
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| METHODS USED FOR CONDUCTOR REPAIR |
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| What guidelines does your company follow when making decisions on conductor repairs? |
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| Does your company have an internal specification covering conductor repairs? |
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| PLEASE ANSWER THE FOLLOWING QUESTIONS BASED ON YOUR COMPANY'S GENERAL PRACTICES: |
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| What method is used to repair a conventional conductor (e.g. round wires : AAC, AAAC, ACSR, earth wires) in the following instances?
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| Which statement corresponds to your company's practice?
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| Which statement corresponds to your company's practice?
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| If the damages occur in a jumper loop? |
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| METHODS USED FOR COMPRESSION SLEEVE REPAIR (INCLUDING IMPLOSIVE FITTINGS) |
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| What guidelines does your company follow when making decisions on compression sleeve repairs? |
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| Does your company have an internal specification covering compression sleeve repairs? |
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| What method is used to repair a compression sleeve in the following instances?
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| REPLACEMENT PROGRAMS FOR CONDUCTOR ACCESSORIES |
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| A replacement program is defined as the replacement of a large quantity of a given fitting on a line segment. |
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| For which of the following fittings has your company put in place one or more replacement program over the last 5 years (including programs started prior to years ago and still in progress)? |
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| Which of the following factors are taken into account when deciding to put in place a replacement program?
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