ground fault detectors in automatic train control
ground fault detectors in automatic train control
(OP)
Can someone help me. I need to know if there are any rules and or regulations in place that say what level, in terms of ohms, to set a ground fault detector. Please can anyone point me in the right direction?? thank you.





RE: ground fault detectors in automatic train control
RE: ground fault detectors in automatic train control
Dan - Owner

http://www.Hi-TecDesigns.com
RE: ground fault detectors in automatic train control
RE: ground fault detectors in automatic train control
RE: ground fault detectors in automatic train control
Does GFI even work on DC?
Mike Halloran
Pembroke Pines, FL, USA
RE: ground fault detectors in automatic train control
First. It is not about ordinary GFI (aka RCD), I think. Or is it?
Second. The ATC works (at least on most European railways) by detecting the wheel axles shorting both rails. The system uses low voltage and high current and usually some weird frequencies to make the function insensitive to ordinary traction currents and its harmonics. I can also imagine that DC is being used.
Third. Yes, there are DC GFIs. Bender has one.
Four. Need to know if you really mean detection of ground faults on the live rail (signalwise) or if you are asking about something else.
Five. If it is about detecting ground faults on the live rail, then I am not aware of a "standard" setting. Must be more than milliamps.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: ground fault detectors in automatic train control
Mike Halloran
Pembroke Pines, FL, USA