ABB POLIM-D Betriebsanleitung - Seite 6

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ABB POLIM-D Betriebsanleitung
Operating instructions for POLIM
3.

DESCRIPTION

3.1.

Intended use

The POLIM
applications. Surge arresters protect the insulation of high voltage and medium
voltage devices against unacceptable overvoltages which are caused by lightning
or switching operations.
The manufacturer is not liable for resulting damages from further, unintended use.
The operator accepts all responsibility for using the POLIM
tended application range as specified in this document.
3.2.

Structure and function

The POLIM
metal-oxide (MO) resistors. These MO resistors have an extremely non-linear re-
sistance property. At the maximum operating voltage of U
current will flow in the mA range. With an increase in voltage, the MO resistors en-
ter a highly-conductive state practically without delay. Thus any further increase in
voltage is limited to the specified residual voltage values. After the decline of the
overvoltage the arrester immediately turns back to the non- or slightly-conductive
state. The MO arrester converts the energy of the surge into heat, which it trans-
fers to the surrounding air.
The stack of MO resistors and connection equipment is held together with loops
made of fiberglass-reinforced plastic. The directly molded silicone housing protects
it from all environmental and weather influences. This design has proven to be the
best solution in every environment for years.
The POLIM
(disconnector). This device disconnects the POLIM
power network, when it has been overloaded and destroyed. Disconnecting is
done by firing of a small propellant charge in the disconnecting device.
The POLIM
•
•
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6
©
-D surge arrester
®
-D is a surge arrester intended for use in high- and medium-voltage
®
-D surge arrester is constructed from serially connected, non-linear
®
-D surge arrester is optionally equipped with a disconnecting device
®
-D is especially suited for overvoltage protection of:
transformers
cables
other medium-voltage apparatuses and systems
EN
ABB
®
-D outside of its in-
, only a small capacitive
c
®
-D surge arrester from the
Doc. 1HC0010173 AB