Groundbed
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A groundbed is an array of electrodes, installed in the ground to provide a low-resistance electrical path to ground or earth. A groundbed is a component in an earthing system. Each electrode is called a ground rod or an earth electrode.
A groundbed is an array of electrodes, installed in the ground to provide a low-resistance electrical path to ground or earth. A groundbed is a component in an earthing system. Each electrode is called a ground rod or an earth electrode. ==Cathodic protection== In cathodic protection, the anode groundbed is the arrangement of anodes in the ground or water and provides the path for protective current to leave the anodes and enter to electrolyte. ==High-voltage direct-current systems== In a high-voltage direct-current transmission system, each converter station may be equipped with a substantial ground bed to facilitate earth-return operation of the system. In normal operation of a bipolar HVDC system, current is carried on the two wires of the transmission line, but if a line fails or one converter fails, the earth return can be used to maintain partial operation. Ground beds must be designed to accept considerable current (on the order of 1000 amperes) for extending times, without drying out. Ground-return operation may cause objectionable earth currents that cause corrosion of other buried services such as pipelines. A short overhead power line may be run from the converter station to obtain the best location for a ground bed. ==See also== Stray voltage Earth potential rise
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