4.2. basic requirement wind power plant
operators that the electronic supply system ex-
ecuted such way comply all times with
EMC (electromagnetic compatibility) requirements so
as prevent interference currents cable shields
and PE.
Despite its small installation width, this high-perform-
ance surge arrestor developed for use wind power
plants suitable for the high requirements large
nominal load currents This enables to
protect even high-bandwidth sensors simply yet effect-
ively.TBS
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Substation/connection grid
Wind power plant
Couplings due lightning currents
Lightning and surge protection measures wind power
plants
3. areas high hu-
midity and low temperatures, the sensor can freeze,
which can impair the measurement signal. However, VDE 0100-534 states that certain
technical requirements must met for these ar-
restors used; these are described further de-
tail below. The
larger the surface area, and the faster the rise time of
the lightning current, the greater the coupled surge
voltage will be. OBO
Bettermann offers space-efficient solution: the MDP.2 Wind power plants
According IEC 62305, lightning discharges can
produce surge currents several hundred kA. This magnetic field can
penetrate the conductor loops power and sys-
tems within wind power plant.
M Mutual inductance
di/dt Current change/time
Protection measures energy technology systems
A type surge arrestor essential for protecting
sensitive electronic components within the wind power
plant. Different power networks and voltages can be
encountered wind power plants: 230/400 and
400/690 Particularly 400/690 networks, spe-
cial requirements relating surge voltage protection
must observed. The mutual induct-
ances, that form, can induce large surge voltages
which can disrupt even destroy electronic compon-
ents. Lightning and surge protection required to
protect the electronic controls and speed control
against failure. These sensors need SPD that is
designed withstand not just the measurement sig-
nal itself, but also large nominal load currents. Most
sensors used locations this kind are fitted with a
heating system. Because, particularly large wind
power plants, long cable lengths with large surface
areas are not uncommon, surge protection device
(SPD) should fitted immediately before each the
sensitive devices within the bus.
Taking account the sensors wind power plants
The latest wind power plants use so-called pitch con-
trols.
Recommended installation locations wind power
plants
Because the coupled surge voltage always both
ends the cable, each device inside the structure
must protected.
The large impulse currents produced, with their rapid
rise times, generate magnetic field that changes
over time and which spreads outwards concentrically
from the lightning channel. This process based the law induction
and can represented follows:
M the mutual inductance the conductor loop.
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201
Chapter The internal lightning protection system
