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What is the formation mechanism of the "ground potential rise"? How it cause damage to electrical and electronic equipment inside and outside the building? Mar 19 , 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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What are the main types of coaxial signal SPDs? What are the differences in their working principles, technical characteristics, and application scenarios? Apr 09 , 2026
Coaxial SPDs can be mainly classified into gas discharge tube, semiconductor voltage limiting, DC isolation, and quarter-wavelength technologies based on their technical principles. Among these, gas discharge tube and semiconductor voltage limiting types form the core of basic protection, while DC isolation and quarter-wavelength technologies are key designs for achieving specific functions. 1. Ga...
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Can the explosion-proof grade Ex db IIC T6Gb of the on-site instrument SPD replace Exd IIC T4 Gb? Apr 13 , 2026
Can the explosion-proof grade Ex db IIC T6Gb of the on-site instrument SPD replace Exd IIC T4 Gb? Conclusion: The Ex db IIC T6 Gb rating fully meets and exceeds the requirements of Exd IIC T4 Gb and can be safely used as a replacement. This conclusion is based on the core principle of "higher ratings are compatible with lower ratings" in the selection of explosion-proof equipment, and the specific...
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