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UL 4703
40 Arcing Test
40.1 General
40.1.1 If the point of current (at rated operating voltage) and voltage (VL as determined from the
relationship given in 39.2.2) that can appear across a cell or interconnect fracture is in the ²ARC TEST²
zone in Figure 40.1, the module or panel shall comply with the provisions of 40.1.2 – 40.6.3. See also
47.9.
40.1.2 With reference to 40.1.1, during conditions of simulated cell or interconnect fracture, there shall be
no ignition of the module or panel.
40.2 Method A
40.2.1 Similar modules or panels to be tested are to be connected in series to achieve an open-circuit
voltage across the fracture equal to that which is present during normal use of the modules or panels with
the specified bypass diodes. The modules and panels are to be irradiated at 80 mW/cm2 or more at 20 –
30°C (68 – 86°F).
40.3 Method B
40.3.1 A single module or panel is to be used with a separate power supply as described in 40.5.2
connected in series to provide the remainder of the source. The module or panel under test is to be
irradiated at 80 mW/cm2 or more at 20°C – 30°C (68°F – 86°F).
40.4 Methods A and B
40.4.1 All bypass diodes, either included with the module or panel or described in the markings shall be
included in the test circuit.
40.5 Method C
40.5.1 A single module or panel is to be used to provide the material for the ignition attempt. However,
all power in the arc is to be provided by an external power supply as described in 40.5.2 connected in
series with only passive portions of the module’s circuit. Cells are to be jumpered if necessary to involve
specific portions of the module or panel insulation system.
40.5.2 With reference to 40.3.1 and 40.5.1 the power supply is to be a constant voltage supply with a
series connected current-limiting resistor. The parameters of the total system are to be as follows:
a) Open-Circuit Voltage – The voltage that is across the fracture during normal use of the
modules or panels with the specified bypass diodes.
b) Short-Circuit Current – Not less than 80 percent nor more than the rated module or panel
short-circuit current, when the current-limiting resistor is adjusted so that the voltage across the
module or panel being tested is zero.
40.6 All methods
40.6.1 The system load is to be a short circuit.
40.6.2 Any connection(s) within the module or panel may be broken (fractured). The breaks are to be
chosen to achieve a worst case condition of maximum open-circuit voltage and/or maximum short-circuit
current at one of the chosen break points.
Exception: Any electrical connection made with wire of circular cross section or flexible braided
construction that is mechanically secured to its connection points is not to be broken. Braided or stranded
wire shall not have any process performed on it that reduces its flexibility. Solder coating of a portion of
the wire at the connection points is acceptable.
40.6.3 An arc is to be drawn across the breaks, with the arc across the material of the module or panel
that it might contact during use of the module or panel. The arcing is to be continued for 15 min at each
location tested. |
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发表于 2011-12-26 18:04:48
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