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Why do signal SPDs commonly use gas discharge tubes instead of varistors as the core primary energy dissipation element? Mar 06 , 2026
The fundamental reason for choosing gas discharge tubes (GDTs) as the primary surge protection component in signal lines is the need to prioritize the integrity of signal transmission while simultaneously providing effective surge protection. This choice is based on the superior characteristics of GDTs in terms of parasitic capacitance, balance maintenance, and tolerance to high currents, which ar...
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Now SPD monitoring has gone far beyond simple "on/off" indications. What intelligent directions is it developing towards? Mar 12 , 2026
Traditional SPD monitoring only provides a dry contact signal based on a mechanical disconnector, which is a typical "post-failure alarm"—it informs the user that the SPD has completely failed and needs to be replaced. Modern intelligent monitoring modules, however, utilize built-in microprocessors and sensors to transform the SPD from a passive protection component into an intelligent node capabl...
- Surge Protection Device
- jinli spd
- jinli lightning protection device
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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...
- JLSP surge protection device
- JLSP SPD
- JLSP surge protector
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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...
- JPD surge protection device
- JLSP surge protection device
- JLSP Jinli
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For SPDs used in high-altitude areas, the electrical clearance needs to be increased. How does the GB/T 18802.11 standard reflect this requirement in testing and certification? Apr 28 , 2026
The GB/T 18802.11 standard explicitly acknowledges the influence of altitude on electrical clearance insulation strength and incorporates this through an "altitude correction factor" in the testing conditions. The standard typically uses 2000 meters as the baseline altitude. For surge protective devices (SPDs) claimed to operate normally at higher altitudes (such as 5000 meters), the testing requi...
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