Inverter system design Xiangjie Lightning

According to IEC1312-1 ~ 3 standard, to protect you Inverter System equipment, will need to protect the space is divided into different mine areas (LPZ), according to the different parts of space LEMP (lightning electromagnetic pulse mine) the extent and circumstances to establish the appropriate level of protection, rational use of the corresponding SPD .


An implementation plan Lightning protection system should be designed to meet the following principles:
1, Protector Does not affect the normal operation of the protected equipment;
2, when the shock wave generated by lightning, protection devices should be used in low impedance, the impact of current directly into the earth and not dangerous impact on the ground potential difference;


3, protective devices should have a higher ability to withstand impact energy and to regulate the earth system.


According to IEC1312-1 ~ 3 specification, inverter system to protect your equipment, will need to protect the space is divided into different mine areas (LPZ), according to the different parts of space LEMP (lightning electromagnetic pulse mine) is establish the extent and the corresponding actual level of protection, rational use of the corresponding SPD.


4, Power supply System: According to the statistics show that 80% of lightning is penetrated by the power line network equipment, to protect Electronic Equipment, need input in their power to set the power SPD before, so the city along the electric circuit can be hit from the lightning over-voltage leakage into the ground in advance.


2, Lightning Protection Design of Power Distribution System
Characteristics of the distribution system for inverter can be divided into three mine areas were to be considered. As mentioned above may give rise to single-stage lightning because lightning current discharge caused by excessive residual pressure after the excessive or insufficient protection due to equipment damage. Therefore, select the power system multi-level protection can prevent direct mine to the action from all levels of surge voltage of the invasion.


1, Power 1 Lightning LPZOA-LPZ1 area:
By "building lightning protection design," Chapter VI: IV 6.4.7 requires the nominal discharge current of each line should not be less than 15KA. Moreover, based on "Lightning in design," Chapter VI: Section IV 6.4.7 and IEC "Lightning electromagnetic pulse," the third part; surge protector requirements, surge protectors can be tens of thousands of V induced by lightning over-voltage limit to 4KV the following.


Sum should be 380V Low Substation power distribution equipment installed nominal total capacity of 25KA to 10/350 S Flow waveform (or 100KA the 8/20 S waveform switching) AOTEMATPORT/4P-B100 modular power surge protector for the whole All electrical equipment, power supply first-class protection.


2, Power 2 mine LPZ1-LPZ2 District :
Building Supply Distribution box Flow waveforms were installed 8/20 S capacity 20KA ~ 40KA of ATT385/4P-C40 three-phase power supply of Products.


3, Power 3 lightning LPZ0-LPZ3:


According to IEC61312-3 lightning electromagnetic pulse III: surge protector's request, LPZ2-LPZ3 District SPD Flow capacity (8/20 S): 10KA. Inverter power distribution box can be installed 8/20 S waveform respectively, current capacity 20KA ~ 40KA of ATT385/4P-C20 three-phase power supply of Products.

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