PVAF-T Series Arc Fault Detection for Solar Applications
Power Controls & Circuit Breakers
In the course of normal operation, high voltage PV systems experience severe environments, thermal expansion, and potentially lingering issues from improper installation. These items contribute to the possibility of a fire due to arcing events. To mitigate this, article 690.11 of the 2011 and 2014 NEC mandates listed arc fault protection on all PV systems with a maximum voltage of 80VDC or more operating on buildings.
Sensata’s PVAF-T arc fault detector is an integrated arc detection solution which is appropriate for NEC 2011 and 2014 compliant equipment. By building on Sensata’s experience in aerospace arc fault technology, Sensata has developed one of the first UL 1699B recognized arc fault detectors for the solar PV industry. Sensata’s PVAF-T arc fault detection solutions offer this capability at an economical price point.
Sensata’s PVAF-T includes an on-board CT for each combined line in an inverter or combiner box. Up to two 40A combined lines can be monitored concurrently on one PVAF-T board, enough to monitor all the PV sources on typical string inverters up to about 30kW. If an arc is found, a signal is sent via an open collector transistor to the string control circuitry of the inverter or combiner box. The on board LED provides a quick visual indication of which strings the PVAF-T has detected an arc on.
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