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2/2017 | MONITOR | 15 theatres or railway uses, the growing importance of photovoltaic power stations for power supply at a national level also increases the significance of func- tional safety for applications of this kind. A faulty or failed insulation monitoring device can cause a huge photovoltaic power station to slip unno- ticed into a critical operating condition. Experience shows that starting a central inverter on an existing double earth fault causes irreparable damage to the central inverter, which in turn leads to the failure of the entire photovoltaic power station. The greater the contribution of large PV arrays to the total supply of electrical power in a region, the more critical any spon- taneous failure of those arrays inevitably becomes. Any cost savings realised by operating unreliable insulation monitoring devices can then become very expensive. “ Any cost savings realised by operating unreliable insulation monitoring devices can then become very expensive.” The Bender isoPV1685 series insulation monitoring devices for unearthed DC systems of up to 1500 V in photovoltaic instal- lations have been awarded a Functional Safety Test Mark by UL. This certifies that these de- vices meet the requirements both for purposes of the UL Listed Test Mark and with regard to function- al safety. Dipl.-Ing. Dieter Hackl, T-MIS INFO More information: https://www.bender.de/produkte/ isolationsueberwachung/ isometer_isopv1685rtuisopv1685p isopv1685pfr

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