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2022-02-23

The ground wire used by the family is mainly used to realize the nature of safety protection. Through this root can be issuedGround light sourceThe wires and household electrical equipment (mainly the housing) are well connected to the ground. In this way, the part that people can touch when using electrical equipment is equipotential with the ground, and the grounding resistance is required to be less than 4 ohms. In daily life, people stand on the ground. In theory, the human foot and the earth are also equipotential. The resistance of the human body is generally greater than 100 ohms. Once the insulation layer of the electrical equipment is destroyed and the equipment shell is charged, it will flow directly to the ground through the ground light source. In this way, even if someone touches the leakage case, it will not cause electric shock, so the normal ground wire will not be charged, and the neon light of the electric pen will not light up when measuring with the electric pen. If it is open, it indicatesGround light sourceThere is a problem, or the electric pen is damaged, or the measurement method is incorrect.

1. There are several kinds of electric pen. If you measure a car with an electric penGround light sourceAs long as there is about 12 volts, the light bulb in the car will light up. If it is a traditional neon light, the general voltage should exceed 50 volts (usually more than 60-80 volts). If there is a problem with the quality of the pen, such as a little inductive electricity, the light of the 12-volt pen may be on, causing misunderstanding. You can use it to measure the zero line, or compare the ground line light source elsewhere, or replace a pen.

2. Although the grounding resistance is theoretically less than 4 ohms, in fact, due to wire aging or poor contact, or unreasonable grounding, even the grounding wire is disconnected or there is no grounding wire light source at all, the grounding resistance is too large. In this way, if there is a small amount of leakage current or induced voltage, the bulb of the pen will also light up. In this case, the grounding problem needs to be solved, otherwise there may be a risk of electric shock.

3. There is no grounding wire at home, and the grounding wire adopts zero line. At this time, the neutral line enters the switch again, or the neutral line is disconnected. The live wire will be directly connected to the 220 volt high-voltage power supply from the electrical appliance, which is very dangerous. When the three phases are unbalanced, the neutral line itself will be charged.

4. A capacitor can be prepared between the electrical equipment housing and the live wire. If the shell of the electrical equipment is poorly grounded, use an electric pen to measure the shell of the electrical equipment, which is equivalent to measuring one end of the capacitor. In this way, you stand on the ground, and the live wire-shell-human body-earth will form a capacitive voltage divider circuit, which may make the electric pen light up. Some common inferior sockets are not connected inside.Ground light sourceTherefore, such a capacitance is formed between the two metal plates of the socket. When measuring the ground wire light source of the socket, the electric pen light will be on, which indicates that there is a problem with the leakage protection function of the ground wire and must be maintained in time.

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