The special protection device for low-voltage surge protector (SSD) is an external disengagement device of the surge protector used in the low-voltage power supply system, which can withstand the expected surge current at the installation of the standby surge protector and the power frequency overcurrent caused by the failure of the surge protector, and has the characteristics of power frequency small current action.
The function of spd for lightning protection is to limit transient overvoltage. It is generally connected in parallel on the main circuit and has the property of high impedance. When TOV occurs in the circuit, it will conduct and discharge the surge current. At this time, it is the conduction mode and can be regarded as a directly grounded conductor, which can discharge the surge current in the main circuit to the grounding wire.
While the surge backup protector cannot be used alone, it must be connected in series with the surge protector against lightning and connected to the front of the SPD surge protector, which usually will not affect the normal working capacity of the surge protector against lightning, but will be quickly broken when the power frequency short-circuit current appears in the line.
There are great differences between antenna surge protector and backup protector. Surge protector is used to protect the electrical safety of the main circuit and prevent lightning current from damaging the protected electrical facilities. The backup protector is a backup protection device used to protect the surge protector from being damaged by power frequency short-circuit current and protect the surge protector from heating and fire. The backup surge protector can not cut off the power frequency short circuit protection in the power frequency surge protector itself. Therefore, both of them are very important. At the same time, neither of them can replace each other. The lightning protection measures in electrical equipment need the mutual cooperation of surge protector and backup protector.
The Relationship Between Up and in in Surge Protector (SPD)July 8, 2022Shenzhen Techwin Lightning Technologies Co., Ltd has independently successfully developed a series of products: SPD surge protector, power surge protector, power surge protector, signal surge protecto...viewHow Does A Surge Protection Device Work?August 30, 20211. Learn what is a power surge before undersanding a surge protection deviceFirstly, you need to understand what a power surge is before understanding how a surge protection device works. When the vol...viewWhat is the Difference Between a Class 1 Lightning Surge Protector and a Class 2?November 9, 2021Since the energy of lightning strikes is very huge, it is necessary to gradually discharge the energy of lightning strikes to the ground through a hierarchical discharge method. The first-level lightn...viewTechnical terminology in IEC61643 standards-1December 8, 20212.1 Technical Term2.1.1. Lightning electromagnetic impulse (LEMP)It is a source of interference. Refers to the effect caused by lightning directly hitting the lightning protection device of a building...viewTechnical terminology in IEC61643 standards-2December 8, 20212.1.20 Reference Voltage UrefIn the area where the volt-ampere characteristics of the metal oxide resistor will transition from the weak electric field area to the strong electric field area, a suitab...viewHow to Select a Proper Surge Protector?December 8, 2021Surge Protective Device is a device designed to protect against transient overvoltages, serving as an important component of the internal lightning protection system. According to its specific usage, ...view
EN
jp 
ko 
fr 
de 
es 
it 
ru 
pt 
ar 
vi 
th 
ro 
bg 
nl 
