ABB MWD Operating Instructions Manual - Page 13
Browse online or download pdf Operating Instructions Manual for Protection Device ABB MWD. ABB MWD 16 pages. Surge arresters
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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:
The disconnector must be connected to earth with a flexible connection.
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.
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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