Lightning protection guide by OBO

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Last revision 2020

Vydal: OBO BETTERMANN s. r. o. Autor: OBO BETTERMANN

Strana 230 z 288

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well-matched systems, these val- ues are around -20 systems. Incoming wave Wave hits change impedance Wave attenuated the joint ZL Impedance the incoming cable Z0 Impedance after joint Damped wave Incoming wave Wave hits change impedance Wave partially reflected and returns Attenuated wave ZL Impedance the incoming cable Z0 Impedance after joint Return loss TBS Blitzschutz-Leitfaden 2018 / en / 2020/01/10 14:42:40 14:42:40 (LLExport_02613) / 2020/01/10 14:42:54 14:42:54 230 Chapter The internal lightning protection system . the imped- ances are different, reflections occur the joint. Transmission characteristics can determined using suitable measuring devices. Calibration also necessary that the meas- urement results are not distorted. Key transmission characteristics are presented below: Insertion loss Insertion loss describes the attenuation system from input output. The device longer receives the full power available be- cause the reflected power runs back along the line to the supply source. Return loss This parameter indicates how much input power is reflected back.keep losses minimum, important verify the cables’ transmission characteristics. What important that the measuring device, connection cables and surge protection device have the same impedance, order to avoid excessive reflection and attenuation the joints. shows the transfer function of the system and accommodates the point