What is a voltage drop test? What is a voltage drop test done?

Voltage drop test items: Voltage dips and short-term interruptions, which are caused by faults in the power grid or power facilities or sudden changes in load. Voltage changes are caused by continuous changes in the load connected to the power grid. If the EUT cannot respond promptly to changes in power supply voltage, it may cause a malfunction.

Definition and detection method of voltage drop:

You can refer to the instructions in IEC61400-21-2008.

It refers to the sudden drop of the power supply voltage from the rated value to a certain potential point, which can cause sudden changes in the line current of the electrical equipment, resulting in potential impact and damage. An intermediate transformer or converter can be used to limit the impact of the impact energy.

Category 1: Suitable for protected power supplies, with compatibility levels lower than those of public power supply systems. It involves the use of equipment that is sensitive to power disturbances, such as laboratory instruments, certain automatic control and protection equipment, and computers. (Equipment installed in Class 1 environments requires protective devices such as uninterruptible power supplies (UPS), filters, or surge suppressors.)

Category 2: Generally applicable to the public coupling point PCC in commercial environments and the internal coupling point IPC in industrial environments. The compatibility level of this class is the same as that of public power supply systems. Therefore, components used in public systems are also suitable for this type of industrial environment.

Category 3: Only applicable to IPC in industrial environments. The compatibility level of certain harassment phenomena in this category is higher than that in category 2. When the following equipment is connected, it should be considered as this type of environment: a. Most of the load is powered by inverters; b. Having welding equipment; c. Frequently started large electric motors; d. A rapidly changing load.