In Stock New And Original PLC MODULE 3BHE006412R0101 UFC762AE101
Brand:
ABBItem No.:
DCS 3BHE006412R0101 UFC762AE101Payment:
T/T, Western Union, Credit CardProduct origin:
SwedenGoods_stock:
11Shipping port:
Xiamen, ChinaLead Time:
1-3 Working DaysCondition:
Brand New And OriginalWarranty:
12 MonthsCertificate:
COOOriginal and Brand New BAILEY Module 3BHE006412R0101 UFC762AE101
Description
The contribution to the short-circuit on the DC side of the inverter may come from the grid and from the discharge of the capacitors inside the inverter. The grid current is due to the recirculating diodes of the bridge inverter which in this case act as a bridge rectifier. Such current is limited by the impedances of the transformer and of the inductors belonging to the output circuit and by the protection fuses of the inverter on the AC side chosen so that they can limit the thermal effects of possible internal faults on the semiconductors. As a consequence the I2 t passing through will be normally reduced. Indicatively a final current value (internal capacitors completely discharged) of 10In can be an upper limit value. This current is present in case of inverter with galvanic insulation at 50Hz, while it is null in case of inverter without transformer. In fact these inverters usually have an input DC/DC converter so that the operation on a wide voltage range of the PV generator is guaranteed; this converter, due to its constructive typology, includes at least one blocking diodes which prevents the contribution of the grid current to the short-circuit. The discharge current of the capacitors is limited by the cables between inverter and fault and exhausts itself with exponential trend: the lowest the impedance of the cable stretch, the highest the initial current, but the lowest the time constant of the discharge. The energy which flows is limited to that one initially stored in the capacitors. Moreover, if a blocking diode or other similar device is in series with one of the two poles, this contribution to the short-circuit is null. In each case, the short-circuit on the DC side causes a drop of the direct voltage, the inverter certainly shuts down and probably is disconnected from the grid. Normally the shut down times of the inverter are of the order of some milliseconds, while the disconnection times may be of the order of some dozens of milliseconds. In the interval between the shut down and the disconnection, the grid might cause the above mentioned effect, while the internal capacitors, if involved, participate up to their complete discharge.
Packaging & Shipping
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2. Packing in a professional anti-static bag.
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