ABB POLIM Gebruiksaanwijzing - Pagina 6

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ABB POLIM Gebruiksaanwijzing
3.3.2

Application guidelines

The following guidelines apply for the use of surge arresters in medium-voltage systems
and in railway applications:
ƒ "Application guidelines Overvoltage protection: Dimensioning, testing and application of
metal oxide surge arresters in medium-voltage systems", document 1HC0075561
ƒ "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