ABB POLIM User Manual

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 Position
Required
torque [Nm]
Screw-in depth [mm]
min. max.
Material pairing: steel bolts class 8.8 in aluminum threads of arrester electrodes
M10 POLIM-H
support on grading
ring (if present)
25 10 10
M10 POLIM-H SD top connection 30 16 16
M10
POLIM-R top connection
30 16 16
M10
POLIM-X top connection
30 15 16
M12
MWK/MWD top & bottom
50 18 23.5
M12
POLIM-C top connection
50 16 20
M12
POLIM-C bottom connection
50 16 16
M12
POLIM-C .. LB top & bottom
30 – –
M12
POLIM-D/-K/4.5 ID top connection
50 20 25
M12
POLIM-D/-K bottom connection
50 20 20
M12
POLIM-D without lug top connection
50 17 17
M12
POLIM-D without lug bottom connection
50 12 12
M12
POLIM-I top & bottom
50 14 14
M12
POLIM-H top & bottom
50 14 20
M12
POLIM-X bottom connection
50 18 25
M16
POLIM-I/-S/-H top connection
100 25 25
M16
POLIM-I/-S/-H bottom connection
100 25 40
M16
POLIM-X top connection
100 23 24
M16
POLIM-X bottom connection
100 23 25
Attachment of a disconnecting device (POLIM-D/-K only)
M10 &
M12
POLIM-D/-K
disconnector
threads at the
disconnecting device
20 – –
Material pairing: steel bolts and steel nuts class 8.8 of some clamping accessories
M6 10
M8 25
M10 50
M12 75
M16 160
3.3.4 Behaviour in fire
The silicone housing of POLIM® and MWK/MWD type arresters is self-extinguishing.
6 | Operating instructions | EN | 1HC0141361 AA

ABB POLIM Specifications

General

Brand	ABB
Model	POLIM
Category	Protection Device
Language	English