Page 9 - Surge-Protection-E_0.pdf
P. 9
Planned Safety
LPZ 0 A
LPZ 0 A
LPZ 0 B
LPZ 0 B
LPZ 0 B
LPZ 0 B
▲ Figure 5.1: Transition from LPZ 0A to LPZ 0B (above) ▼ Figure 5.2: Transitions from LPZ 0A to LPZ 1 and LPZ 0B to LPZ 1 (below)
LPZ 0 A
LPZ 0 A
LPZ 0 B
LPZ 0 B
LPZ 1
LPZ 0 B
LPZ 1
LPZ 0 B
LPZ 1
LPZ 1
LPZ 1
HES
HES
HES
LPZ 1
HES
MEB
MEB
According to the requirements and loads placed on surge protective de- even further and to limit the surges induced or generated in the instal-
vices, they are categorised as lightning current arresters, surge arrest- lation itself.
ers and combined arresters. The highest requirements are placed on the
discharge capacity of lightning current arresters and combined arresters The lightning and surge protective measures at the boundaries of the
used at the transition from lightning protection zone 0A to 1 or 0A to 2. lightning protection zones described above are equally applicable to pow-
These arresters must be capable of conducting partial lightning currents er supply and information technology systems. All measures described in
of 10/350 μs wave form without being destroyed in order to prevent the the EMC-based lightning protection zone concept help to achieve con-
ingress of destructive partial lightning currents into the electrical installa- tinuous availability of electrical and electronic devices and installations.
tion of a building. At the transition point from LPZ 0B to 1 or downstream
of the lightning current arrester at the transition point from LPZ 1 to 2 For more detailed technical information, DEHN offers a “Lightning Pro-
and higher, surge arresters are used to protect against surges. Their task tection Guide“ which can be downloaded at
is both to reduce the residual energy of the upstream protection stages www.dehn-international.com/en/downloads.
7
