Patent ID: 9425614
Filing Date: 2016-08-23
CPC Classification: H02H

Claim Text:
1. A lightning protection radio remote unit (RRU), comprising: a primary circuit; a secondary circuit coupled to the primary circuit; and a working circuit coupled to the secondary circuit; wherein the primary circuit is configured to receive a power supply from a power supply system through inner conductors in a shielded cable, the shielded cable comprising a shield layer, and the secondary circuit collaborates with the primary circuit to convert the power supply received by the primary circuit into a working power supply and outputs the working power supply to power the working circuit, the shield layer located on the RRU side of the shielded cable and the shield layer located on the power supply system side of the shielded cable are grounded respectively, a surge over-voltage withstand capability between the primary circuit and the earth is not less than a lightning over-voltage, a surge over-voltage withstand capability between each inner conductor in the shielded cable and the shield layer of the shielded cable is not less than the lightning over-voltage, and the lightning over-voltage derives from a product of a shield layer lightning current that flows through the shield layer of the shielded cable and a resistance of the shield layer of the shielded cable, and the shield layer lightning current is determined according to a lightning current compliant with a specific lightning protection level.