Ground detection is achieved by collecting the voltage between the live wire and the ground wire.
In household electricity use, it is crucial to ensure the safe operation of electrical equipment. Ground detection is an effective safety measure.
It can detect whether there is a ground fault in the equipment, thereby ensuring the safety of equipment and personnel.
This article will introduce the principle, implementation method, judgment criteria, and importance of ground detection.
1. Understand grounding detection
Ground detection is a technology that determines whether the equipment is normal by monitoring the voltage between the live and ground wires.
A ground fault can cause the equipment enclosure to become electrified or even cause a fire, so ground detection is very important.
2. Principle of ground detection
The principle of ground detection is that when the equipment is normally grounded, the voltage between the live wire and the ground wire fluctuates within the range of 220v±10%.
When a ground fault occurs in the equipment, the voltage between the live wire and the ground wire will quickly drop below 198V.
Therefore, by collecting the voltage between the live wire and the ground wire, you can determine whether the equipment is properly grounded.
3. Implement grounding detection
To implement ground detection, you need to follow the following steps:
1. At the power inlet of the equipment, connect the live wire and the ground wire with well-insulated wires,
and connect them to the positive and negative terminals of the voltmeter.
2. Turn on the voltmeter, and observe and record the voltage between the live wire and the ground wire. Under normal circumstances, the voltage value should be within the range of 220v±10%.
3. If you find that the voltage value is not within this range, you can try to remove the ground wire of the device and measure the voltage again. If the voltage value drops below 198V, the equipment has a ground fault.
4. Determine fault
According to the experimental results, if the voltage of the equipment’s live wire and ground wire is not within the range of 220v±10%,
and the voltage value drops below 198V after removing the ground wire,
it can be determined that the equipment has a ground fault. To ensure safety, equipment should be repaired or replaced in time.
5. Summary
This article introduces how to implement ground detection by collecting the voltage between the live wire and the ground wire, including its principle,
implementation method, and judgment criteria. Ground detection is an important measure to ensure the safety of household electricity.
It can detect whether there is a ground fault in the equipment, thereby avoiding accidents. In daily life, we should develop the habit of regularly checking the grounding of electrical equipment to ensure the safety and reliability of home circuits.
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