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What is "ground potential rise" phenomenon? How it cause damage to electrical and electronic equipment inside and outside the building? Jun 01 , 2026
Ground potential rise is caused by transient high potentials resulting from lightning current entering the ground. When lightning strikes a building's lightning rod or the nearby ground, thousands to hundreds of thousands of amperes of lightning current are discharged through the grounding system. Due to the resistance and inductance of the grounding system, according to U=IR+L·di/dt, the potentia...
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How is the Up value determined in an SPD with multiple protection modes (such as L-N, L-PE, N-PE)? What is the important guiding significance of SPD selection Jun 26 , 2026
According to the standard, the declared Up value of a multi-mode SPD is the maximum residual voltage value measured across all its protection modes. For example, for a three-phase SPD, if the residual voltage is 1.5 kV in L-PE mode, 1.8 kV in L-N mode, and 2.0 kV in N-PE mode, then the Up value of this SPD should be specified as 2.0 kV. This means that the protection level provided by this SPD to ...
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Why need to specifically focus on parameters such as "insertion loss," "return loss," and "bandwidth" in high speed lines (such as Gigabit Ethernet) SPDs? Jul 10 , 2026
Signal SPD (Surge Protective Device) protects high-frequency data signals. Its primary function is to minimize interference with signal transmission quality while providing surge protection. Traditional parameters such as residual voltage (Up) and surge current capacity (In/Iimp) ensure the "survival" of the equipment, while the parameters mentioned above ensure the "communication" of the system. ...
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How should the selection and installation strategies of SPDs be adjusted to achieve effective surge protection? Jul 17 , 2026
When grounding conditions are poor, the core principle of SPD application shifts from "low-impedance current discharge" to "equipotential bonding and voltage limitation," and the technical strategy is adjusted accordingly: Prioritize using SPDs with a "3+1" or "1+1" wiring configuration: For TT or TN systems, traditional SPDs may fail to operate effectively due to poor grounding if a low-impedance...
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