50
Instruction Booklet
IB131006EN
Effective March 2019
Instructions for installation,
operation, and maintenance of type
VCP-W vacuum circuit breakers
EATON
www.eaton.com
6.3 Inspection and maintenance procedures
No./section
Inspection item
Criteria
Inspection method
Corrective action
1.Insulation
Insulation integrity
Drive insulator, barriers,
and
stand-off insulators
Main circuit to ground
Between main circuit terminals
Control circuit to ground
No dirt
and
No cracking
Withstand
Withstand
Withstand
Visual check
Visual check
Hipot tester
Hipot tester
Hipot tester
Clean with lint-free cloth
or
replace cracked piece.
Clean and retest or replace .
Clean and retest or replace.
Clean and retest or replace.
2. Power elements
Vacuum interrupters
Primary disconnects
Pole unit X-washers
for 150 VCP-W 63
Visibility of contact
erosion marks
Contact wipe indicator visible
Adequate vacuum
Dirt on ceramic body
No burning or damage
Every 1000 operations
Visual - Close the circuit breaker
and observe if all black, blue
or machined groove marks on
moving stems are visible
Refer to paragraph 6.5
Proceed with integrity check as
described in Paragraph 6.4
Visual check
Visual check
Operation counter
If a mark is not visible, then check if the
pole unit plastic bushing is intact on
the moving stem of the VI just below
the cup plate. If the bushing is intact,
then replace the interrupter assembly
and perform contact wipe check. If the
bushing is NOT intact, then glue back the
bushing to the cup plate and observe the
mark again.
Replace interrupter assembly.
If integrity check is not satisfactory,
replace interrupter assembly.
Clean with lint-free cloth.
Replace if burned, damaged or eroded.
Replace all X-washers per Figure 26.
3. Control circuit parts
Closing and tripping device
including disconnects
Wiring
Terminals
Motor
Smooth and correct operation
by control power
Securely tied in proper place
Tight
Smooth, normal operation
Test closing and tripping of the
circuit breaker twice
Visual check
Visual check
Functional test
Replace any defective device. Identify
per trouble-shooting chart .
Repair or tie as necessary.
Tighten or replace if necessary.
Replace brushes or motor.
4. Operating mechanism
Tightness of hardware
Dust or foreign matter
Lubrication
Deformation or excessive wear
Manual ooperation
CloSure test
No loose or missing parts
No dust or foreign matter
Smooth operation and no
excessive wear
No excessive deformation or
wear
Smooth operation
0.6 inch over-travel
Visual and by feel
Visual check
Sight, feel and per maintenance
schedule
Visual and operational
Manual charging, closing and
tripping
CloSure Test (6.9.1)
Refer to Table 23 and tighten or reinstate
if necessary with appropriate tools.
Clean as necessary.
Refer to Figure 25 and paragraph 6.10
and lubricate very sparingly with light
mineral oil.
Remove cause and replace parts.
Correct per troubleshooting chart if
necessary.
If < 0.6, contact your local Eaton Sales
and Service Center.
