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WG-B2.47_draft2.3

CIGRÉ Working Group B2.47
Remedial actions for aged fittings & repair of conductors

SURVEY ON EXPERIENCE WITH REPAIR METHODS FOR FITTINGS AND CONDUCTORS OF POWER TRANSMISSION LINES

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IMPORTANT NOTICE

Introduction
To be completed...

Confidentiality
To be completed...

Definitions
To be completed...

1/6 - IDENTIFICATION OF RESPONDENT

Name of company:

Contact Information:

First Name :
Last Name :
Phone :
Email Address :

Total circuit length:

< 5000 km [3125 miles]

5001 - 15 000 km [3126 - 9375 miles]

15 001 - 25 000 km [9376 - 15 625 miles]

> 25 000 km [15 625 miles]

Voltage breakdown:

	%
115 - 199 kV
200 - 499 kV
500 - 599 kV
> 600 kV

Network age (construction year):

	%
Prior to 1950
1950 - 1960
1961 - 1970
1971 - 1980
1981 - 1990
1991 - 2000
After 2000

Does your utility see a need for a guide regarding remedial actions for aged fittings and repair of conductors?

Yes

Don't know

Other

2/6 - INSPECTION PROGRAM

Do you inspect the condition of a new line prior to commissioning?

Yes

If yes, when is this inspection performed?

During construction

Prior takeover

Within the end of guarantee period

Other

What is the usual interval between inspections of the following line components?

	First inspection after commissioning (years)	Interval after first inspection (years)
Conductors

Suspension clamps and insulator string components

Spacers / Spacer-dampers / Vibration dampers / Aircraft warning markers

Dead-ends and joints

QUANTITY/TYPE OF DAMAGE REPORTS (ON A PARTICULAR LINE / FOR A PARTICULAR PRODUCT) BEFORE IT HAS ANY IMPACT ON THE INSPECTION PLAN?

Conductor away from fittings (eg. lightning, clashing, cart damages):

Suspension clamps and insulator string components:

Spacers / Spacer-dampers / Vibration dampers / Aircraft warning markers:

Dead-ends and joints:

Does your company records damage reports on a central database?

Yes

3/6 - DAMAGES TO CONDUCTOR AND FITTINGS

WHEN AND WHERE ARE DAMAGES ON CONDUCTOR AND FITTINGS DETECTED?

Conductor away from fittings (eg. Stringing damages, cart damages, conductor clashing, lightning):

Conductor in the vicinity of clamps (suspension or other accessories):

Suspension clamps and insulator string fittings:

Spacers / Spacer-dampers / Vibration dampers / Aircraft warning markers:

Dead-ends and joints:

4/6 - CAUSES OF DAMAGES

WHAT ARE THE PRINCIPAL REASONS FOR DAMAGES?

Conductor away from fittings (eg. Stringing damages, cart damages, conductor clashing, lightning):

Conductor in the vicinity of clamps (suspension or other accessories):

Suspension clamps and insulator string fittings:

Spacers / Spacer-dampers / Vibration dampers / Aircraft warning markers:

Dead-ends and joints:

5/6 - EXTENT OF DAMAGES TO CONDUCTOR AND FITTINGS OVER THE LAST 5 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.

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)

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)

WHAT ARE THE EFFECTS OF THE DAMAGES?

Damages to conductor (all types)

Damages to suspension clamp and insulator string fittings

Damages to spacers / spacer-dampers / vibration dampers / aircraft warning markers (including clamp looseness)

Damages to dead-ends and joints

6/6 - REMEDIAL ACTIONS

METHODS USED FOR CONDUCTOR REPAIR

What guidelines does your company follow when making decisions on conductor repairs?

Does your company have an internal specification covering conductor repairs?

Yes

PLEASE ANSWER THE FOLLOWING QUESTIONS BASED ON YOUR COMPANY'S GENERAL PRATICES:

What method is used to repair a conventional conductor (e.g. round wires : AAC, AAAC, ACSR, earth wires) in the following instances?

Which statement corresponds to your company's practice?

	The repair is performed using helical products allowing the outside diameter of the repaired conductor to remain within the diameter range of the clamp	The repair is performed using two compression sleeves to replace the damaged portion of the conductor with a new segment	Other (please detail)
If the damages are in the vicinity of a suspension clamp

If the damages are in the vicinity of a vibration damper clamp

If the damages are in the vicinity of a spacer-damper clamp

Which statement corresponds to your company's practice?

If the damages occur in a jumper loop?

No special procedure applies

The jumper loop conductor (or sub-conductor) is replaced entirely

Other

METHODS USED FOR COMPRESSION SLEEVE REPAIR (INCLUDING IMPLOSIVE FITTINGS)

What guidelines does your company follow when making decisions on compression sleeve repairs?

Does your company have an internal specification covering compression sleeve repairs?

Yes

What method is used to repair a compression sleeve in the following instances?

	Replacement	Helical splice shunt	Bolted clamp shunt	Increased monitoring
Compression sleeve showing direct signs of deterioration

Compression sleeve showing only indirect signs of deterioration (e.g. thermal imagery, resistance measurements)

REPLACEMENT PROGRAMS FOR CONDUCTOR ACCESSORIES

A replacement program is defined as the replacement of a large quantity of a given fitting on a line segment.

For which of the following fittings has your company put in place one or more replacement program over the last 5 years?

Which of the following factors are taken into account when deciding to put in place a replacement program?

CIGRÉ WG-B2.47

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