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C&M

6 rue des Hauts Musats
89100 SENS

Tel +33 (0)3 86 83 08 78
Protection Cathodique

Certification MASE

Cables control

Overview

The device OHLCD SHANNON allows the control of bimetallic cables of any sections, that they are conductive of line or cable of guard.

ACSR lines degrade over their lifetime. Industrial pollutants and salt sea air cause corrosion in the conductors. This corrosion determines the useful life of the conductor. Corrosion occurs on the steel core bundle and between the steel and aluminum strands of the conductor.

Our Conductor Corrosion Assessment System measures the volume of zinc on the steel core bundle to define the condition of the conductor. This method is a comparative test that uses a reference model of the aging conductor. The information collected is presented in graphic form. The data shows the length of the span and the condition of the galvanizing on the steel core bundle.

 
Cables 2

Our assessment process defines the condition of conductors by collecting data from scans taken at intervals along the circuit totaling 10% of the length of the circuit. Each individual span tested is analyzed to assess its condition profile and these profiles are combined to provide an assessment of the circuit. Any anomalous conditions such as severe, localized loss of galvanizing are also reported. The Remaining Service Life projection is derived from the Circuit Condition Assessment, service history provided by the client and STC's experience gained over more than 15 years of conductor testing.

 

 

 

Aging of Conductors

ACSR lines reach the end of their service life due primarily to corrosion from industrial pollutant and salt sea air. There are two corrosion processes that effect the useful life of ACSR lines:

a. Corrosion of the steel core bundle

This happens because the zinc galvanizing corrodes leaving the steel core exposed to the environment. Over time the cross section of the steel core bundle is reduced through pitting corrosion and the line can fail due to loss of torsional ductility and/or mechanical strength.

b. Corrosion of the aluminum strands

Once the galvanizing is lost and the unprotected steel is exposed to the aluminum conductor, corrosion of the aluminum can begin. In the presence of a suitable electrolyte, aluminum becomes the sacrificial anode and oxidizes in preference to the steel because it is a more electrically active metal. In latter stages of corrosion the loss of aluminum conductor increases resistance creating hot spots on the cable. This can cause the aluminum to melt and the conductor to fail. View Diagram of Corrosion.

 

 

 


C&M solution

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Tél : +33 (0)3 86 83 08 78 – Fax : +33 (0)3 86 83 04 27 – E-mail : info@c-et-m.fr

And visit our Website : www.c-et-m.fr