Operating instructions for POLIM
©
-D surge arrester
ABB
12
EN
Doc. 1HC0010173 AB
5.4.3. Minimum
distances
between surge arresters and earth
The minimum permissible distances between the surge arresters and the earth are
specified on the data sheets supplied with the offer or order confirmation. The val-
ues are based on calculations for unfavourable conditions and include safety mar-
gins.
X
Observe national regulations and the rules of the system owner.
X
The mounting position of a surge arrester with equipped disconnecting device
shall be such, that disconnected earth wire can swing freely and in this case
no flash over will occur between the bottom connection and earth.
5.4.4. Connections
The base or foundation for the surge arrester must be flat, clean and suitable for
the loads that arise.
The following materials made of stainless or galvanised steel are to be provided by
the customer depending on the application:
•
bolts
•
nuts
•
bolt
locks
•
any required balancing washers
The ordered mounting accessory is already mounted to the surge arrester in most
cases. If the mounting accessory hase been ordered and delivered separately, it
shall be mounted according to the enclosed instruction, drawing, data sheet or di-
mensional drawing.
X
Surge arrester with disconnecting device:
Mount insulating bracket at vertical surface (wall, column, tower). Connect
earth wire to the stud of the disconnecting device. Use a stranded cable.
X
Surge arrester without disconnecting device:
Mount the ground plate of the surge arresters directly to the frame or by
means of a metalllic mounting bracket. Connect earth wire to the ground plate
of the surge arrester.
X
Connect the high voltage connection cable to the head end terminal of the
surge arrester. Use a stranded cable.
X
Observe recommended torques (Clause 3.3.3).
X
When tightening the bolt, the torque shall be countered by a spanner at the
same terminal.
X
Carefully clean contact surfaces before mounting and lubricate with acid-free
contact grease.
X
Ensure selection of suitable material pairs.
