What's the use of TN-S system?

This article mainly introduces the use of TN-S system, has a certain reference value, friends who need can refer to it. I hope you will learn a lot after reading this article. Next, let the editor take you to learn about it.

The TN-S system is a zero-connected protection system in which the exposed and conductive part of the load-side electrical equipment is grounded through the protection zero line when the neutral point of the power transformer is directly grounded.

The TN-S system is a zero-connected protection system in which the exposed and conductive part of the load-side electrical equipment is grounded through the protection zero line when the neutral point of the power transformer is directly grounded. TN-S working zero wire and protection zero wire (ground wire) are separated, N line is working zero line, PE line is special protection zero wire (grounding wire), that is, the equipment shell is connected to PE wire.

There are five types of protection grounding system: TT, IT, TN-C, TN-S and TN-C-S. The power supply system is different in different areas, and the protection grounding in the computer room will change accordingly. The last three kinds of protection grounding are commonly used, and the TN-S system should be adopted in the computer room.

Extended data:

The characteristics of TN-S power supply system:

1. During the normal operation of the system, there is no current on the special protection line, but there is an unbalanced current on the working zero line. The PE line has no voltage to the ground, so the zero protection of the metal shell of the electrical equipment is connected to the special protection line PE, which is safe and reliable.

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

3. Special protection line PE shall not be disconnected, nor shall it enter the leakage switch.

4. The leakage protector is used on the trunk line, and the working zero line must not have repeated grounding, while the PE line has repeated grounding, but does not pass through the leakage protector, so the leakage protector can also be installed on the power supply line of the TN-S system.

5. TN-S power supply system is safe and reliable, and is suitable for low voltage power supply systems such as industrial and civil buildings. "three links and one level" in front of construction workers (electricity, water, road and horizon-TN-S power supply system must be adopted).

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