SecoGear 24kV-27kV Air Insulation Switchgear
30
Inspection and replacement of the
surge arrester
Inspection and replacement of
potential indicator
It is necessary to replace the surge arrester based on big
difference between reference voltage and the test data recorded
on site during the maintenance and recording. The steps are as
follows:
Mounting bracket and
earthing bar for arrester
Figure 6/12: Installing surge arrester
•
Remove the cable between the arrester and copper
connection (See figure 6/12)
•
Remove the fixed bolts on both sides of the mounting bracket
of the arrester
•
Push the three arresters and the bracket
•
Remove the fixed bolts on the mounting bracket of the
arrester
Figure 6/13: Surge arrester mounting plate
•
Install the new arrester and fasten the bolts with the mounting
bracket
•
Screw both side bolts on the brackets
•
Fix the connection between the arrester and copper
connection
If the display "Lock" on the potential indicator is flashing, and
an abnormal sound from the relay is continuously heard, there
may be two reasons that can cause this problem. First, there
may be a problem with the potential indicator contact. Second,
the display itself may have a fault despite three-phase power
condition.
Both of these situations demand to replace the display. The
steps are as follows:
Lock indicator
Test push button
Three phase charged
display
Figure 6/14: Potential indicator
There are two types potential indicators. One is with latching
contact, and another is without the latching contact. The
replacement of the two types are the same. (See figure 6/14)
•
Cut off the auxiliary power of potential indicator (if any)
•
Disconnect all the connection from the back of the indicator
•
Remove the lock of the potential indicator, and then push it
out (See figure 6/15)
•
Replace with the new one, and fix the lock
•
Reconnect the wires at back
•
Recover the auxiliary power
Lock to fix of
the potential
indicator
All connection o n
the jointing row
Figure 6/15: Removing and installing for the potential indicator
