Using a multimeter to measure leakage faults in circuits or equipment
As an essential measuring instrument for electricians, a multimeter can measure many physical quantities such as voltage, current, resistance, and capacitance. Therefore, a multimeter plays a very important role in measuring circuits and repairing circuits. How to use a multimeter to measure leakage faults in circuits or equipment.
What is leakage
Leakage is caused by the electrical connection between the damaged insulation layer of the wire and the electrical casing equipment, which causes the current in the wire to "leak" out. For example, the contact between the motor casing and any three-phase electricity may cause leakage; Another issue is that the electrical connection between the shell of a household appliance and the live wire in the mains is caused by some reason, resulting in a certain potential difference between the metal shell of the household appliance and the live wire. This phenomenon is also known as leakage. The occurrence of electric leakage can pose a significant risk and easily cause electric shock accidents for machine operators. In this regard, we often use leakage protectors to protect the circuit.
What gear is used by a multimeter to measure leakage
How to conduct inspections after a leakage accident occurs? This is an issue that many friends are concerned about. Now, let me share my opinion on this issue. The first thing we think of is using a multimeter to detect electrical equipment for leakage faults. I think there are two methods of detection, one is using the electrical resistance method; The other 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 at the RX10K position. If it is a digital multimeter, it can be set at the 200M position. 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 there is a deviation of the pointer at this time, That means that the insulation strength between the metal shell of this electrical equipment and the power supply is not enough, which means there is leakage.
