Medium Voltage ZnO Surge Arresters
2005-06-Arrester installation instr-CIS-Rev 1
1
Safety Warning
Surge arresters should be installed only
by competent personnel familiar with
good safety practices and the handling of
high voltage electrical equipment.
The enclosed installation instruction is not
intended as a substitute for adequate training and
experience in safe procedures nor to replace or
supersede
existing
safety,
operating and
maintenance procedures.
Installation Note
Arresters are typically to be installed between the line
conductor and ground.
Only in a few special cases (motor protection, cable
sheath protection, ...) arresters may be installed in a
different way. Please consult your system administrator
for details if required.
Before Starting
Check if all parts (surge arrester & accessories)
are included in the box according to the
description printed on the carton label.
If the accessories come disassembled please
assemble all parts as appropriate prior to the
final installation. Please refer to the enclosed
drawings for the correct torque.
Check if the arrester or the accessories have
been damaged during transport. Never install a
damaged arrester. It may fail violently, causing
severe personal injury.
All surge arresters carry a nameplate giving
details of arrester type and voltage rating. Check
the voltage rating of each single arrester. Do not
install arresters with voltage ratings other than
specified by your system administrator.
Check if the arrester and the accessories fulfill
the local requirements in terms of mechanical
dimensions. Do not alter the arrangement of the
accessories or the accessory itself!
Do not leave out any parts!
Please ask your local system administrator about
the minimum clearances you have to meet
between live parts and ground. The values for
outdoor substations do apply. If not available you
may refer to Table 1 instead showing the values
according to IEC 60071-2.
If you are installing a special kind of surge
arresters like SPA-I with insulated line lead,
shorter clearances may apply. Please refer to the
relevant addendum covering those arresters.
If unsure about assembly sequence, please
request and refer to relevant assembly drawing.
Arresters applied at voltages higher than
rating may cause damage and injury.
Check the arrester rating, marked clearly
on the name plate, to ensure correct
application!
Installation
Do not handle the polymeric housing of the
arrester with tools!
Certain type of arresters ave a protrusion at both
ends of the arrester.
You can hold the arrester there safetly with a
second wrench to fasten the nuts included with
some accessories. Use the protrusion on the side
close to the nut to be fastened.
In case the arrester hasn’t got a protrusion please
support the arrester by hand.
Make sure that the electrical system is de-
energized and earthed.
!
!
