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Operating instructions
| EN | 1HC0075079 AB
2.2
Basic safety precautions
2.2.1
Product safety
The POLIM®4.5 ID has been constructed using state-of-the-art technology and officially recognised
safety-related rules. Danger to life and health of the user or third parties could arise or damage of
the POLIM®4.5 ID and other property could occur while the POLIM®4.5 ID is in use, however.
X
The POLIM®4.5 ID is only to be used when it is in technically sound condition, for the intended
purpose, and with safety and the possible dangers in mind while observing the operating instruc-
tions.
X
Keep the operating instructions intact and fully readable, and store them in such a way that they
are accessible to operating personnel at all times.
X
Decommission and replace overloaded or damaged POLIM®4.5 ID units.
2.2.2
Personnel-related measures
X
Train personnel in professional and safe working with high-voltage technology.
X
Train and instruct personnel in working on the POLIM®4.5 ID using the operating instructions.
X
Personnel being trained, instructed or provided with general education may only work with the
POLIM®4.5 ID under constant supervision by an experienced high-voltage technology professio-
nal.
2.2.3
Organisational measures
X
Observe all safety- and danger-related information regarding the POLIM®4.5 ID.
X
The safety rules of the owner of the high- and medium-voltage system and all regulations of the
respective national safety authorities are to be observed.
X
Only trained and instructed professionals may be authorised.
X
Clearly assign areas of responsibility for working with the POLIM®4.5 ID. Make them known and
adhere to them.
X
Only personnel who have read and understood the operating instructions, especially the „Basic
safety precautions“ section may be allowed to carry out activities with the POLIM®4.5 ID.
X
Check to ensure that work is being performed in a safety-conscious way with awareness of possi-
ble dangers and while observing the operating instructions.
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Description
3.1
Intended use
The POLIM®4.5 ID is a surge arrester intended for use in medium-voltage applications. Surge arres-
ters protect the insulation of medium voltage devices against overvoltages which are caused by light-
ning or switching operations.
The manufacturer is not liable for resulting damages from further, unintended use. The operator
accepts all responsibility for using the POLIM®4.5 ID outside of its intended application range as
specified in this document.
3.2
Structure and function
The POLIM®4.5 ID surge arrester is constructed from two parallely connected, non-linear metal-
oxide (MO) resistors. These MO resistors have an extremely non-linear resistance property. At the
maximum operating voltage of U
c
, only a small capacitive current will flow in the mA range. With an
increase in voltage, the MO resistors enter 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 transfers to the surrounding air.
The stack of MO resistors and connection equipment is held together with strong straps made of
fiberglass-reinforced plastic. The directly molded silicone housing protects it from all environmen-
tal and weather influences. This design has proven to be the best solution in every environment for
years.
