Coordination of insulation monitoring devices

I suspect that unless the makers do some sort of special kit to allow the systems to be interlinked, they will just report  each other's measurement currents as faults. (For clarity, I'm imaging systems of the sort   explained here   ) Certainly the simple DC injecting systems will interact.


 I'm much less less sure about the PRBS  type (PRBS explained  the "AMP" system is an example) I imagine these could in principle  be programmed with individual  Gold codes  (Robert Gold's low cross-correlating codes) to not see each others waveforms, but I'm not sure the systems are really all that sophisticated, and it makes for a slow system as you have to average the signals over several full code sequences to get the benefit of  discrimination between your own code and that of another system. (however it works OK in 3G phones, where all the signals are overlaid but each one has a unique unscrambling key)


If it does not exist, then inventing that will be hard , where there might be more mileage is with one detection node but with variations in what sequence of  actions is taken  at first fault - you could have an automated system that mimics an operator taking various branches out of circuit, to see which clears the fault condition, so in short order the minimal zone around the faulty section is turned off, and the rest keeps running.


If you really have to have nested systems, I think you'' need the manufacturers on side to tell you how or even if it can be done.

Mike.

I suspect that unless the makers do some sort of special kit to allow the systems to be interlinked, they will just report  each other's measurement currents as faults. (For clarity, I'm imaging systems of the sort   explained here   ) Certainly the simple DC injecting systems will interact.


 I'm much less less sure about the PRBS  type (PRBS explained  the "AMP" system is an example) I imagine these could in principle  be programmed with individual  Gold codes  (Robert Gold's low cross-correlating codes) to not see each others waveforms, but I'm not sure the systems are really all that sophisticated, and it makes for a slow system as you have to average the signals over several full code sequences to get the benefit of  discrimination between your own code and that of another system. (however it works OK in 3G phones, where all the signals are overlaid but each one has a unique unscrambling key)


If it does not exist, then inventing that will be hard , where there might be more mileage is with one detection node but with variations in what sequence of  actions is taken  at first fault - you could have an automated system that mimics an operator taking various branches out of circuit, to see which clears the fault condition, so in short order the minimal zone around the faulty section is turned off, and the rest keeps running.


If you really have to have nested systems, I think you'' need the manufacturers on side to tell you how or even if it can be done.

Mike.