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Stray current interference

The adjustment of a protection station or of a complete protection system where there is stray current interference is made much easier by potential control. Potential control can be indispensable for electrochemical protection if the protection potential range is very small (see Sections 2.4 and 21.4). This saves anode material and reduces running costs. [Pg.234]

Measurement of the cable sheathing/soil potential can be used to assess the corrosion danger from stray current interference (see Section 15.5.1). Since the measured values vary widely and the stray currents cannot be switched off, IR-free potential measurements are only possible with great effort. In order to keep the IR term of the potential measurement low, the reference electrode must be placed as close as possible to the measured object. With measurements in cable ducts (e.g., underneath tramway tracks), the reference electrodes can be introduced in an open duct. [Pg.327]

Stray Current Interference and Stray Current Protection... [Pg.347]

Figure 15-2a shows the stray current interference by a bipolar high-voltage dc power line [7]. When the system breaks down, large voltage cones occur in the soil at the grounding installation. A few kilometers away, the current density in the soil is relatively low. [Pg.353]

Fig. 15-2 Stray current interference from high-voltage dc transmission installations (a) bipolar system, (b) monopolar system. Fig. 15-2 Stray current interference from high-voltage dc transmission installations (a) bipolar system, (b) monopolar system.
Fig. 15-3 Stray current interference of pipelines by telluric currents. Fig. 15-3 Stray current interference of pipelines by telluric currents.
Fig. 15-5 Stray current interference in the region of dc railway (a) Polarization of the railway lines, (b) voltage between the soil in the vicinity of the rails against a remote ground. Polarization of the pipeline (c) without stray current drainage, (d) with stray current drainage without a resistor, (e) with stray current drainage via a resistor R. Current in the pipeline (f) without stray current drainage, (g) with stray current drainage. Fig. 15-5 Stray current interference in the region of dc railway (a) Polarization of the railway lines, (b) voltage between the soil in the vicinity of the rails against a remote ground. Polarization of the pipeline (c) without stray current drainage, (d) with stray current drainage without a resistor, (e) with stray current drainage via a resistor R. Current in the pipeline (f) without stray current drainage, (g) with stray current drainage.
Fig. 15-8 Synchronous current, voltage and potential recording with stray current interference from dc railways (a) Without protective measures, (b) direct stray current drainage to the rails, (c) rectified stray current drainage to the rails, (d) forced stray current drainage with uncontrolled protection rectifier, (e) forced stray current drainage with galvanostatically controlled protection rectifier (constant current), (f) forced stray current drainage with potentiostatically controlled protection rectifier (constant potential), (g) forced stray current drainage with potentiostatically controlled protection rectifier and superimposed constant current. Fig. 15-8 Synchronous current, voltage and potential recording with stray current interference from dc railways (a) Without protective measures, (b) direct stray current drainage to the rails, (c) rectified stray current drainage to the rails, (d) forced stray current drainage with uncontrolled protection rectifier, (e) forced stray current drainage with galvanostatically controlled protection rectifier (constant current), (f) forced stray current drainage with potentiostatically controlled protection rectifier (constant potential), (g) forced stray current drainage with potentiostatically controlled protection rectifier and superimposed constant current.
Fig. 15-10 Stray current interference of ships at the supply quay from welding operations with a central welding transformer. Fig. 15-10 Stray current interference of ships at the supply quay from welding operations with a central welding transformer.
G. Cavallero, D. Melodia, F. Panaro, Monitoring of stray current interference in the reinforced-concrete structures of the Turin underground railway loop , 54 NACE Corrosion 99, 1999. [Pg.146]

The causes and common means of detecting and mitigating stray current interference effects that result from direct current sources are reviewed in this Sect. [1, 40-44]. Alternating current, while creating a potential safety ha2ard, may contribute to corrosion of ferrous structure [42]. Extensive research is in progress in this regard. [Pg.415]

Detection of Stray Currents Static stray currents of a pipeline can be detected by analy2ing pipe-to-soil potentials. The graph in Fig. 13 shows a pipeline with no interference. Figure 14 shows a potential plot for a coated pipeline with stray current interference. Interference may be... [Pg.417]


See other pages where Stray current interference is mentioned: [Pg.233]    [Pg.336]    [Pg.347]    [Pg.360]    [Pg.364]    [Pg.404]    [Pg.573]    [Pg.228]    [Pg.228]    [Pg.233]    [Pg.336]    [Pg.347]    [Pg.349]    [Pg.353]    [Pg.360]   


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