The Fraunhofer Institute for Photo voltaic Vitality Methods (ISE) has changed the 2011 UL 1699B commonplace with the brand new IEC 63027 commonplace for inverters, which incorporates arc fault detectors. The aim is to enhance the security and effectivity of inverter know-how.
in Germany Fraunhofer ISE introduced that it has printed a brand new worldwide take a look at commonplace for inverters that features arc fault detection units.
The analysis institute mentioned the brand new IEC 63027 commonplace will exchange the UL 1699B commonplace issued by the Illinois-based certification physique Underwriters Laboratories (UL) in 2011, when arc fault detectors grew to become necessary in america.
“The brand new IEC commonplace eliminates a number of the weaknesses of the previous US commonplace, which doesn’t adequately simulate actual operation,” the institute mentioned. “In consequence, many arcs aren’t detected, as a result of they don’t attain the alarm threshold values or as a result of false alarms are triggered.”
Based on Fraunhofer ISE, undetectable arcs and false tripping in photo voltaic inverters can solely be averted with a practical take a look at setup that makes use of an digital DC supply as a PV simulator as an alternative of an actual one. PV modules. “The present flows from the PV simulator to the inverter by means of a connection level that may be exactly minimize off,” defined the specialists at Fraunhofer ISE.
“The connection level is a ball-and-socket joint consisting of two tungsten electrodes, that are pulled at a hard and fast pace, thus igniting a attribute arc.”
The take a look at setup additionally considers the electrode distance and pace, whereas utilizing a filter community between the inverter and the simulated PV system.
“The time till the inverter turns off is essential for the right operation of the arc detector: The shorter the arc burning time, the decrease the vitality enter on the fault contact level, i.e., the shorter the occasions to extinguish that reliably prevents the hearth from beginning,” added the scientists, noting that the arc fault detector efficiently handed the take a look at with vitality values between 200 and 750 joules, extinguished inside 2.5 seconds. “Computerized reconnection after detector tripping is allowed 4 occasions inside 24 hours. After the fifth time it have to be related manually. “
The institute says that the brand new take a look at bench is now deployed in TestLab Energy Electronics, the place it already exams units for DC voltages as much as 1,500 V.
“We’re increasing the vary of companies supplied by our TestLab Energy Electronics, the place we carry out accredited exams in accordance with grid codes, effectivity measurements and impedance spectroscopy exams of inverters,” says Steffen Eyhorn, head of TestLab Energy Electronics.
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