ABB MWK Manual de instrucciones - Página 12
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5.4.6
Distances between surge arresters and earth
The recommended distances between the surge arresters and the earth are specified on
the data sheets supplied with the quotation or order confirmation. The values are based on
calculations for unfavourable conditions and include safety margins.
Observe national regulations and the rules of the system owner.
X
Surge arrester with disconnecting device
Ensure that the mounting position of a surge arrester equipped with a disconnecting
X
device is such that a disconnected earth wire can swing freely and in this case no flash
over will occur between the bottom connection and earth.
5.4.7
Earthed installation
If no surge arrester monitoring devices such as surge counters and/or milliammeters were
supplied, the POLIM® and MWK/MWD type surge arresters are to be mounted earthed.
Bolt surge arresters directly to the earthed frame or foundation. Use the centering
X
washers (if supplied) when fixing the mounting plate.
Connect the earth connection of the surge arrester to its base plate tap.
X
Earthed installation of POLIM 4.5 ID
The POLIM®4.5 ID surge arrester is to be mounted earthed.
Mount the metallic side bars of the surge arresters directly to the earthed frame.
X
Connect both side bars of the surge arrester to earth.
X
Use flexible connection and connect the high-voltage connection with the top terminal of
X
the surge arrester.
Observe recommended torques (see chapter 3.3.3 above).
X
Carefully clean contact surfaces before mounting and lubricate them with acid-free
X
contact grease.
Ensure selection of suitable material pairs.
X
5.4.8
Insulated installation
If surge arrester monitoring devices such as surge counters and/or milliammeters were
supplied, the POLIM® and MWK/MWD type surge arresters are to be mounted insulated.
Mount surge arresters with the included loose insulators made of cast resin on the
X
earthed frame or foundation according to the dimensional drawing.
Mount monitoring devices according to the respective mounting instructions.
X
Monitoring devices with analogue display
Monitoring devices with analogue display are connected in series to the surge arrester
between the base plate and the ground connection.
Attach the cable connector of the monitoring devices to the base plate tap of the surge
X
arrester.
Select a cable or conductor for the connector cable with the same diameter and material
X
as used for the earth connection.
Connect the earth connection to the earth tap of the monitoring devices.
X
Digital monitoring devices
Installation of digital monitoring devices is described in their respective operating
instructions.
12 |
Operating instructions | EN | 1HC0141361 AA