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DETECTION, MITIGATION, AND CONTROL OF CONCENTRIC NEUTRAL CORROSION IN MEDIUM-VOLTAGE UNDERGROUND CABLES
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Available format(s): Hardcopy, PDF
Language(s): English
Published date: 18-02-2007
Publisher: Institute of Electrical & Electronics Engineers
1 Overview 1.1 Scope 1.2 Purpose2 Normative references3 Definitions4 Purpose of the concentric neutral wires 4.1 Path for flow of charging currents 4.2 Path for flow of fault currents 4.3 Reduce step and touch potential 4.4 Provide a system neutral 4.5 Types of concentric wires5 Consequences of significant neutral corrosion 5.1 Cable failures caused by loss of metallic shield component 5.2 Improper operation of protective devices 5.3 Stray currents and interference 5.4 Effects on power quality 5.5 National Codes6 Causes of neutral corrosion 6.1 Galvanic corrosion cell 6.2 Corrosion cell set up on a single metal 6.3 Soil corrosion 6.4 Differential aeration 6.5 Unintended or stray electrical currents 6.6 The coating of concentric neutral wires7 Detection and evaluation 7.1 Visual inspection 7.2 Test concentric neutral using a time domain reflectometer (TDR) 7.3 Concentric neutral resistance measurement method 7.4 Surface voltage measurement technique8 Control and mitigation 8.1 Cathodic protection using anodes and rectifiers 8.2 Cable replacement 8.3 Use of jacketed cable 8.4 Economic considerations with existing and new cableAnnex A (informative) Bibliography
This guide provides a summary of the methods for detection, mitigation, and control of concentric neutral corrosion in medium-voltage, unjacketed, underground distribution cable installed direct buried or in conduit.
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