Earthing; Maintenance; Safety - ABB POLIM Operating Instructions Manual

5.5

Earthing

Observe national regulations and the requirements of the system owner.
X
Connect surge arresters to the system ground via the shortest path. Carefully clean
X
contact surfaces before mounting and lubricate them with acid-free contact grease.
Ensure selection of suitable material pairs.
X
Observe recommended cross-sections:
X
Surge arrester type
MWK/MWD,
POLIM-C..N, -C..ND, -C..LB
POLIM-R
POLIM-D
POLIM-C..HD
POLIM-H..ND, -H..SD
POLIM-I
POLIM-X
POLIM 4.5 ID
POLIM-K
POLIM-S
POLIM-H..N
Surge arrester with disconnecting device
Ensure that a surge arrester equipped with a disconnecting device meets the following
X
requirements:
ƒ The disconnector must be connected to earth with a flexible connection.
ƒ One side of the earth wire must be connected to the disconnecting device, the o ther
side must be connected to the earth near the mounting position of the insulating
bracket.
ƒ In case of disconnection, ensure that the disconnected earth wire can swing freely and
that no flash over will occur between the bottom connection and earth (see chapter
5.4.6).
6

Maintenance

The surge arresters do not contain wearing parts and are therefore maintenance-free.
Replacement parts are not needed.
We recommend to check the surge arresters visually on a regular basis for damages and the
clamps of surge arrester terminals for loose connections.
6.1

Safety

DANGER!
System uses high-voltage
Electric shock may cause death, serious injury and damage to the system.
Allow only authorised professionals to perform work on the surge arrester.
X
Observe the safety rules of EN 50110-1 or equivalent local standards on the "Operation of
X
Electrical Installations" before working on the system:
à Disconnect the system from the power supply.
à Secure the system against being switched on again.
à Ensure that the system is de-energised.
à Ground the system and short-circuit it.
à Cover or cordon off neighbouring energised parts.
1HC0141361 AA | EN | Operating instructions
Recommended cross-section
for copper [mm²]
35
70
70
95
120
Recommended cross-section
for aluminum [mm²]
70
95
120
150
240
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