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Tony S

Earth free systems

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Earth free systems

 

From experience I can say they are a pain. Our furnaces used DC injection through chokes primarily to detect iron seepage through the refractory. See

 

Earth monitoring is usually provided as a phase to earth fault could go undetected until a second fault occurs.

 

The simplest method is using lamps, if one dims it indicates a fault. By using a high impedance Y∆ transformer less leakage occurs, a lamp or relay indicates a fault but doesn’t tell you which phase. A relay could be used as a shutdown system or an alarm.


Earth-free_zps09dahuth.jpg


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