total
protection
against
overvoltages
Autovía A-92, Km. 6,5 - 41500 - Alcalá de Guadaíra - SEVILLA - ESPAÑA
Tfno. 34 954 999 900 - Fax. 34 95 425 93 60 / 70
www.toscano.es -
[email protected] TOSCANO LINEA ELECTRONICA, S.L.
CUADROCONTADOR
CLASE I
SUB-
CUADRO
CLASE II
CAT. I
EQUIPOS
SENSIBLES
CLASE III
CAT. II
EQUIPOS
ROBUSTOS
Surge protection devices
Transient surges
It is a sudden and high current increase (µs) on
an electricity network, that can reach many kV.
In their majority they are caused by atmospheric
discharges, even if sometimes they are due to
commutations on the network.
They can provoke serious damages and the destruction of the electrical devices,
bad operation and reduction of their estimated life as well as interruption of the
service to users.
All these problems can be eliminated reducing this hard impulse by protective
devices (Vigivolt).
Temporary overvoltages
It can be defi ned as an increase of the network
current, over the 10% of the nominal value for an
indefi nite time, from milliseconds to hours. The
origin is due to the neutral loss or to a failure of
the medium voltage transformer.
As for the transient surges, the temporary overvoltages can cause damages and
the destruction of the electrical devices, their premature aging and loss of safety
for the users.
The devices (Vigivolt) avoid these risks by switching off the power supply, acting
on the main switch.
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