reverse current overload

16:26 Sep 5, 2015 

Zmieniłem na próbę przeciążenia prądem wstecznym.

16:24 Sep 5, 2015 

Tylko nie "test". W języku polskim, w tym kontekście to próba. Niestety kalkowane nagminnie jako test.

00:07 Sep 5, 2015 

Glosariusz zawiera test przeciążenia prądem wstecznym.

23:12 Sep 4, 2015 

Wybrane tłumaczenie jest technicznym nieporozumieniem.
Dokumentacja, jak się domyślam, jest chińska.
Zgodnie z normą, nie jest to dopuszczalny prąd wsteczny (układ nie ma prawa pracować z taką wartością prądu), ale wartość (te 135% zabezpieczenia), dla jakiej bada się, czy nie dojdzie do termicznego zniszczenia modułu, itp.

Jeśli opisywany panel wymagał zabezpieczenia np. 20 A, to próba przeciążeniowa została przeprowadzona dla 27 A. Ten parametr, to po prostu informacja o jej przeprowadzeniu.

22:45 Sep 4, 2015 

Based on the source provided below, the answer of Arrakis is the correct one:
Test przeciążenia prądem wstecznym MST 26 – wyznaczanie ryzyka zapłonu, ognioodporności komponentów fotowoltaicznych w warunkach działania prądu wstecznego.
http://pv.pl/badania-modulow-fotowoltaicznych-wg-procedur-ie...

22:43 Sep 4, 2015 

Part 2 :
A laboratory DC power supply shall be connected to the module with positive output
connected to the positive terminal of the module. The reverse tests current (Itest) shall be
equal to 135 % of the module’s overcurrent protection rating, as provided by the
manufacturer. The test supply current should be limited to the value of Itest, and the test
supply voltage shall be increased to cause the reverse current to flow through the module.
The test shall be continued for 2 h, or until ultimate results are known, whichever occurs first.
NOTE Concerning the maximum overcurrent protection rating, see 12.2 of IEC 61730-1.
10.9.3 Pass criteria
The pass criteria are as follows:
a) There shall not be flaming of the module, nor flaming or charring of the cheesecloth and
tissue paper in contact with the module.
b) MST 17 shall meet the same requirements as for the initial measurements.
http://www.polar-pv.com/ch/IEC 61730-2 2004 en.pdf

22:42 Sep 4, 2015 

10.9 Reverse current overload Test MST 26
10.9.1 Purpose
Modules contain electrically conductive material, contained in an insulating system. Under
reverse current fault conditions, the tabbing and cells of the module are forced to dissipate
energy as heat, prior to circuit interruption by an over-current protector installed in the
system. This test is intended to determine the acceptability of the risk of ignition or fire from
this condition.
61730-2 © IEC:2004 – 49 –
10.9.2 Procedure
The module under test is to be placed with its superstrate face down onto a 9 mm thick soft
pine board, covered by a single layer of white tissue paper.
The back surface of the module shall be covered with a single layer of cheesecloth. The
cheesecloth is to be untreated cotton cloth, running 26 m2/kg to 28 m2/kg and have a “thread
count” of 32 by 28.
Any blocking diode provided shall be defeated (short-circuited).
The test shall be conducted in an area free of drafts.
The irradiance on the cell area of the module shall be less than 50 W/m2.
A laboratory DC power supply shall be connected to the module with positive output
connected to the positive terminal of the module. The reverse tests current (

22:39 Sep 4, 2015 

For the sake of future generations, let it be known that you can catch more flies with honey than with vinegar. The problem here was incomplete context, although a bit of research would have shown that, indeed, this is a test in which the photovoltaic module is subjected to reverse current to force its failure. It is usually a time test (2 hours) to see whether the module survives under reverse current equal to some percentage of the module's overcurrent protection rating (135%) without flaming. This is NOT "dopuszczalny prąd wsteczny."