B. 9.5 gallons (35.9 liters) of oil will fill tank to correct
level as indicated by line on fiber liner (4 inches
from rim of tank).
New oil should be filtered before use, even if it
was obtained from an approved source. Passing oil
through a blotter press will remove free water and
solid contaminants such as rust, dirt, and lint. Keep
aeration to a minimum during filtering to prevent
moisture from condensing in oil. Moisture will
lower the dielectric strength of transformer oil.
15. Install new O-ring head gasket into head casting groove.
16. Replace cover and mechanism in tank:
A. Wipe O-ring type head gasket and tank gasket seat
clean of any oil residue.
B. Position head so manual operation handle is above
handle warning decal, tighten bolts alternately
(tighten bolts to 25-40 ft-lb (34-54 Nm) torque).
C. Operate manually until recloser reaches lockout; to
be sure no air remains in hydraulic mechanism.
17. Test mechanical operation. An easy, effective test can
be performed as follows:
A. Move the operating lever to CLOSED position and
wait a minimum of 6-7 minutes to allow the trip
piston to fully reset.
B. Move operating lever to OPEN position and listen
for opening of the main contacts. Then quickly
move lever back to CLOSED position to hear for
contacts to close. There will be a short delay for
the main plunger to return to the up position.
C. Continue opening and closing manually until
lockout is achieved (recloser mechanism will
no longer latch when the lever is moved to the
CLOSED position).
D. If the recloser fails to operate to lockout, or if
it appears to mis-operate in any way, additional
disassembly and testing will be required to
identify the source of the malfunction. Refer to the
Advanced Maintenance
section of this manual.
18. Perform an Insulation Level Withstand Test, see
procedure following in Testing section of this manual.
Routine maintenance testing
See
Testing
section for tests recommended to determine
that the recloser is operating properly. For a more detailed
explanation of testing procedures, refer to
Reference Data
R280-90-2, Low Voltage AC Testing of Hydraulic Recloser
.
Types V4L and V4E single-phase maintenance instructions
3
MAINTENANCE INSTRUCTIONS
MN280055EN May 2017
