How to use a multimeter to measure leakage faults on circuits or equipment
As an essential measuring instrument for electricians, a multimeter can be used to measure many physical quantities such as voltage, current, resistance, and capacitance. Therefore, multimeters play a very important role in measuring and repairing circuits. How to use a multimeter to measure leakage faults in circuits or equipment.
What is leakage
Leakage is caused by the insulation layer of the wire being damaged and there is an electrical connection between the electrical enclosure and the equipment, which leads to the leakage of current in the wire. For example, the shell of an electric motor may come into contact with any of the three-phase electricity, which may cause leakage; Another issue is that the electrical connection between the casing of household appliances and the live wire in the mains is caused by some reason, resulting in a certain potential difference between the metal casing of household appliances and the live wire, which is also known as leakage. The occurrence of electrical leakage can pose a significant danger and easily cause electric shock accidents for machine operators. In this regard, we often use leakage protectors to protect the circuit.
What gear does a multimeter use to measure leakage current
How to conduct inspections after a leakage accident occurs? This is a question that many friends are concerned about. Now let me talk about my opinion on this issue. For such a question, the first thing we think of is to use a multimeter to detect whether there is a leakage fault in electrical equipment. I think there are two methods for detection, one is to use resistance method; Another method is the voltage method.
1. Resistance method for detecting leakage faults
When using the resistance method to detect leakage faults, first disconnect the power supply of the electrical equipment. We can use a pointer multimeter RX10K gear. If it is a digital multimeter gear, it can be set to 200M gear. Use one probe of the multimeter to contact the circuit of the live wire (phase wire), and then use the other probe to contact the metal shell of the equipment. Under normal circumstances, the pointer of the multimeter should display an infinite resistance value. If the pointer deviates at this time, it indicates that the insulation strength between the metal shell of the electrical equipment and the power supply is insufficient, which is leakage.
