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Question:

The zero line of the transformer can be connected with the ground wire. Why not leave it?

The zero line of the transformer can be connected with the ground wire. Why not leave it?

Answer:

Can only be a little ground ah, two grounding system impedance is not the same.
Transformer at the zero line with the ground line together, called "repeat ground", is to achieve a stable system 220 volts power supply, the advantage is now widely used 380 / 220V system. That connector out immediately, there is a zero sequence current transformer, set in the zero line busbar, mainly to protect the transformer, it will not allow the transformer zero line there is a large current, that is a fault. The substation is coming out again. The general line is the end of the user or equipment, the device is a three-phase five-wire system, there is a main switch, often this switch is with leakage protection function, it does not allow any part of the line ground, the body accidentally touch, Causing the switch off power, can play a role in protecting personal safety. So, this part is not allowed to zero line and ground together, also known as TN-S system.
Now the transformer, if the secondary side of the leakage protection, the user also received a leak, the zero line and ground must not be connected
Transformer ground is a neutral point directly grounded, and then there are protective grounding, just with it. The rest of the place, in addition to protecting the ground, the power system can no longer be grounded

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