Do you know the Up value of surge protectors?

Surge protectors, as an important protective device, play a crucial role in protecting equipment from surge currents. When choosing a surge protector, an important parameter is the Up value. So, do you really understand the Up value of a surge protector?

 

Up: voltage protection level

parameter that characterizes the performance of the SPD in limiting the voltage across its terminals, which is selected from a list of preferred values. This value is greater than the highest value of the measured limiting voltages

 

After determining the limit of the Up value according to the national standard requirements, according to the standard specification 5.5.3.2 of GB/T 18802.12-2014 Selection and Use Guidelines for Surge Protective Devices in Low Voltage Distribution Systems, the Up value should be equal to or greater than the highest value of the measured limit voltage, and can be selected from the following preferred values:

 

Preferred values of voltage protection level Up (IEC61643-11)

0.08; 0.09; 0.10; 0.12; 0.15; 0.22; 0.33; 0.4; 0.5; 0.6; 0.7; 0.8; 0.9;

1.0; 1.2; 1.5; 1.8; 2.0; 2.5; 3.0; 4.0; 5.0; 6.0; 8.0 and 10 kV

 

 

A small Up value is beneficial for protecting equipment, but it is not necessarily better to have a smaller Up value. Factors such as temporary overvoltage TOV should be considered and appropriately selected to match the protected equipment.

 

A small Up value is beneficial for protecting equipment, but it is not necessarily better to have a smaller Up value. Factors such as temporary overvoltage TOV should be considered and appropriately selected to match the protected equipment. Secondly, as the maximum continuous operating voltage Uc or nominal current In increases, Up will also increase. When other parameters of the SPD cannot meet Up, it is necessary to comprehensively consider and choose Up that is closest to meeting the conditions.

It is very important to understand the meaning of the Up value and choose according to actual needs when choosing a surge protector. The appropriate voltage protection level (Up) can effectively protect the equipment and improve its stability and reliability.