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JW-TYN1803

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JW-TYN1803

JW-TYN18022019-08-30
JW-TYN18042019-08-30
  • Classification:Solar garden light

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  • Date of issue:2019/08/30
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According to what I know, some garden lamp manufacturers in real life do not know much about the problems and requirements of garden lamp grounding. In actual construction, it is easy to see the problem of a village. Now let me answer for you. The concentrated performance is: In the case of repeated grounding of the TN-S system, it is not clear whether the N-line is repeatedly grounded or the grounding of the PE is repeated. For garden lights, repeated grounding is the repeated grounding of the PE wire, as analyzed below.




1. If the grounding is not repeated, when the PE is disconnected, the system is in an unprotected state that is neither connected to zero nor grounded. After repeated grounding, the system is in the zero-protection state when the PE is normal; when the PE is disconnected, if the disconnection is in the repeated grounding front system, it is in the grounding protection state. The garden lamp that has been repeatedly grounded has a double protection function, that is, the protection mode of the TN-S to the TT system after the PE is disconnected (the PE disconnection is on the front side of the repeated grounding).




2. Repeated grounding of the PE line can reduce the voltage of the device shell to the ground when the phase line is short-circuited. When the phase line is in contact with the shell, the voltage of the shell to ground is equal to the voltage between the fault point P and the neutral point of the transformer. Assume that the phase line is the same as the PE line specification, and the device housing is 110V to ground. After the PE line is repeatedly grounded, from the fault point P, the PE line impedance is in parallel with the repeated grounding resistance RF: the resistance in series with the grounding resistor RA. In general, since the resistance of the repeated grounding resistance RF in series with the working grounding resistance R is much larger than the impedance of the PE line itself, the equivalent impedance from P to the neutral point of the transformer is still close to the neutral point from P to the transformer. The impedance of the PE line itself. If the phase line and the PE line are in the same specifications, the voltage UP between the P and the neutral point of the transformer is still about 110V, and at this time, the ground voltage UP of the device casing is only a part of the voltage UP between the fault P point and the transformer neutral point.




3. When the phase line is disconnected from the earth and the ground is short-circuited, the potential of the PE line increases due to the fault current. When the resistance between the line break and the ground is small, the potential of the PE line is likely to exceed the safe voltage. . This dangerous voltage is transmitted along the PE line to the outer casing of the equipment and endangers personal safety. After repeating the grounding, the equivalent resistance of the repeated grounding resistance in parallel with the power supply T as the grounding resistance is smaller than the grounding resistance of the power supply, so that the grounding resistance at the grounding of the phase-breaking line shares the increased voltage, thereby effectively reducing the PE line to ground. Voltage to reduce the risk of electric shock.


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