What does TN-S system mean?

The TN-S system is a zero connection protection system that when the neutral point of the power transformer on the power side is directly grounded, the uncharged exposed conductive parts of the load side electrical equipment are grounded through the protective neutral line.

#The operating environment of this article: windows10 system, thinkpad t480 computer.

TN-S The system is a zero connection protection system that when the neutral point of the power transformer on the power side is directly grounded, the uncharged exposed conductive parts of the load side electrical equipment are grounded through the protective neutral line. The TN-S working neutral line and protective neutral line (grounding wire) are separated. The N line is the working neutral line, and the PE line is a dedicated protective neutral line (grounding wire), that is, the equipment shell is connected to the PE line.

There are five types of protective grounding systems: TT, IT, TN-C, TN-S, TN-C-S. Different regions have different power supply systems, and the protective grounding of the computer room will also change accordingly. The latter three types of protective grounding are more commonly used, and the computer room should adopt the TN-S system.

Extended information:

Characteristics of TN-S power supply system:

1. When the system is running normally , there is no current on the dedicated protection line, but there is an unbalanced current on the working neutral line. There is no voltage between the PE line and the ground, so the zero protection of the metal shell of electrical equipment is connected to the dedicated protection line PE, which is safe and reliable.

2. The working neutral line is only used as a single-phase lighting load circuit.

3. The special protective line PE is not allowed to be disconnected, nor is it allowed to enter the leakage switch.

4. Use a leakage protector on the trunk line. The working neutral line must not be repeatedly grounded, while the PE line is repeatedly grounded, but does not pass through the leakage protector. Therefore, leakage protection can also be installed on the TN-S system power supply trunk line. device.

5. The TN-S mode power supply system is safe and reliable, and is suitable for low-voltage power supply systems such as industrial and civil buildings. The "three connections and one level" (electricity, water connection, road connection and ground level - must adopt the TN-S power supply system) before the construction project is started.

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