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Explain the connection method of three-phase five wire system of distribution box in detail

Views: 513     Author: Site Editor     Publish Time: 2021-07-19      Origin: Site

Three phase five wire system includes three phase lines (a, B, c) and neutral line (n); And ground wire (PE wire). The neutral line (N line) is the zero line. When the three-phase load is symmetrical, the sum of the current vectors flowing into the neutral line of the three-phase line is zero, but for a single phase, the current is not zero. When the three-phase load is asymmetric, the sum of the current vectors of the neutral line is not zero, resulting in the voltage to ground.


The colors of three-phase five wire standard conductor are: yellow for a wire, green for B wire, red for C wire, light blue for n wire and yellow green for PE wire.


Three phase five wire system can be divided into TT grounding mode and TN grounding mode, among which TN can be divided into TN-S, TN-C and tn-c-s.


Three phase five wire system can be divided into TT grounding mode and TN grounding mode, among which TN can be divided into TN-S, TN-C and tn-c-s.


The voltage between phase lines of civil power supply lines (i.e. line voltage) is 380V, and the voltage between phase line and ground wire or neutral line (i.e. phase voltage) is 220V. The entrance line generally adopts single-phase two-wire system, that is, any one of the three phase lines and neutral line (as zero line). In case of high-power electrical appliances, it is necessary to set the grounding wire by itself.


The colors of three-phase five wire standard conductor are: yellow for a wire, green for B wire, red for C wire, light blue for n wire and yellow green for PE wire.


Three phase five wire system includes three phase lines (a, B, c) and neutral line (n); And ground wire (PE wire). The neutral line (N line) is the zero line. When the three-phase load is symmetrical, the sum of the current vectors flowing into the neutral line of the three-phase line is zero, but for a single phase, the current is not zero. When the three-phase load is asymmetric, the sum of the current vectors of the neutral line is not zero, resulting in the voltage to ground.


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