ABB POLIM Betriebsanleitung - Seite 6
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3.3.2
Application guidelines
The following guidelines apply for the use of surge arresters in medium-voltage systems
and in railway applications:
"Application guidelines Overvoltage protection: Dimensioning, testing and application of
metal oxide surge arresters in medium-voltage systems", document 1HC0075561
"Application guidelines Overvoltage protection: Dimensioning, testing and application of
metal oxide surge arresters in railway facilities", document 1HC0075573
3.3.3
Recommended torques and screw-in depths
Thread
Arrester type
Material pairing: steel bolts class 8.8 in aluminum threads of arrester electrodes
M10
POLIM-H
M10
POLIM-H SD
POLIM-R
M10
POLIM-X
M10
MWK/MWD
M12
POLIM-C
M12
POLIM-C
M12
POLIM-C .. LB
M12
POLIM-D/-K/4.5 ID
M12
POLIM-D/-K
M12
POLIM-D without lug
M12
POLIM-D without lug
M12
POLIM-I
M12
POLIM-H
M12
POLIM-X
M12
POLIM-I/-S/-H
M16
POLIM-I/-S/-H
M16
POLIM-X
M16
POLIM-X
M16
Attachment of a disconnecting device (POLIM-D/-K only)
M10 &
POLIM-D/-K
M12
disconnector
Material pairing: steel bolts and steel nuts class 8.8 of some clamping accessories
M6
M8
M10
M12
M16
3.3.4
Behaviour in fire
The silicone housing of POLIM® and MWK/MWD type arresters is self-extinguishing.
6 |
Position
support on grading
ring (if present)
top connection
top connection
top connection
top & bottom
top connection
bottom connection
top & bottom
top connection
bottom connection
top connection
bottom connection
top & bottom
top & bottom
bottom connection
top connection
bottom connection
top connection
bottom connection
threads at the
disconnecting device
Screw-in depth [mm]
Required
torque [Nm]
min.
25
30
30
30
50
50
50
30
50
50
50
50
50
50
50
100
100
100
100
20
10
25
50
75
160
Operating instructions | EN | 1HC0141361 AA
max.
10
10
16
16
16
16
15
16
18
23.5
16
20
16
16
–
–
20
25
20
20
17
17
12
12
14
14
14
20
18
25
25
25
25
40
23
24
23
25
–
–