Siemens TL.. Provozní pokyny stáhnout pdf (Strana 25)

Application

3.11 Grounding and lightning protection

Building lightning strike protection is described in IEC 62305-3 (EN 62305-3). Among other things, this

standard establishes the classification of individual lightning strike protection systems and indicates the

resulting lightning strike protection measures required.

Grounding and lightning strike protection are to be set up in conformance with IEC62305.

3.11.1 Grounding concept

The design and dimensioning of the grounding system are the main criteria for channeling the lightning

current into the ground (high-frequency behavior) and to reduce dangerous peak currents.

In accordance with DIN EN 62305-3 a low grounding resistance (under 10 Ω, measured at a low

frequency) is recommended.

To avoid high potential differences between the various grounding systems, these are all connected to

the same grounding system.

This is done by connecting the electrical operating areas and the PV field grounding systems to a

comprehensive meshed grounding system.

By meshing all grounding systems, potential differences between the various plant parts are greatly

reduced. In addition, lightning-induced voltage loads on the electrical interconnections between the

buildings are also reduced.

Mesh sizes of 20 m x 20 m up to 40 m x 40 m have proved economically and technically useful in larger

PV systems.

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 60 61

Žádné komentáře

Siemens TL.. Provozní pokyny Strana 25