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| A COMPUTERIZED CATHODIC PROTECTION SYSTEM FOR MULTI-ANOED CONTROL |
| Yang Jinwei Xu Naixin and Zhang Chengdian (Shanghai Institute of Metallurgy;Academia Sinica) |
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Abstract When a large scale object is to be cathodically protected by impressed current,more than one anodes are usually installed at appropriate places and fed by a single potential controlled rectifier. In many such cases,some anodes may provide excessive current, causing overprotection,while others may bring about underprotection. In fact,different dc voltage is required for every individual anode to offer satisfactory protection.A reasonable solution to this problem is to develop multichannel controller in place of mono-channel controller such as the above-mentioned rectifier.In our previous study,a microcomputer based system for impressed current cathodic protection was established.Potential control was achieved by periodic adjustments of dc power output.In the present study,the new system is extended to multi-anode control.Each anode is driven by its own dc power module,the output of which is controlled independently.During the interval between the successive controls of the same anode channel, the computer can control over other anode channels.Thus in this new system every channel is indepent and can offer appropriate individual output.In this way,more uniform potential distribution can be achieved.Laboratory tests have verified these considerations through computerized 103-channel control system.
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Received: 25 June 1990
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[1] 杨金伟,徐乃欣,张承典,中国腐蚀与防护学报,3(1) ,15(1988)
[2] Gabriele Rocchini,Alfredo Colombo,CORROSION/86,Paper No.344． |
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