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SECTION 6: INSPECTION & MAINTENANCE
DANGER
DO NOT WORK ON A CIRCUIT BREAKER IN THE 'CONNECT' POSITION.
DO NOT WORK ON A CIRCUIT BREAKER WITH SECONDARY
DISCONNECTS ENGAGED.
DO NOT WORK ON A CIRCUIT BREAKER WITH SPRINGS CHARGED OR
CONTACTS CLOSED.
DO NOT DEFEAT ANY SAFETY INTERLOCKS.
DO NOT LEAVE MAINTENANCE TOOL IN THE SOCKET AFTER CHARGING
THE CLOSING SPRINGS.
STAND AT LEAST ONE METER AWAY FROM THE CIRCUIT BREAKER WHEN
TESTING FOR VACUUM INTEGRITY.
6.2 INSPECTION AND MAINTENANCE PROCEDURES
NO. / SECTION
INSPECTION ITEM
1.
Insulation
Stand Off Insulators, Operating Rods,
Tie-Bars and Barriers
Vacuum Integrity
Between main circuit with
terminals ungrounded
Insulation Integrity
Main circuit to ground
Control circuit to ground
(Charging Motor disconnected)
2.
Power Element
Vacuum Interrupter Assembly
Primary Disconnects
3.
Control Circuit Parts
Closing and tripping devices
including disconnects
Wiring
Terminals
Motor
Tightness of hardware
4.
Operating Mechanism
Dust or foreign matter
Deformation or excessive wear
Manual operation
CloSure
™
N
otte:
Contact Eaton for any mechanism maintenance other than adjustment or replacement of control components.
BOLT SIZE
8 - 32
TORQUE Lbs. In.
24
CRITERIA
No dirt
No cracking
Withstand
27kV 60Hz for 1 Minute
Withstand
15kV, 60Hz for 1 Minute
(5kV Rating)
Withstand
1125V, 60Hz for 1 Minute
Contact erosion visibility
Contact wipe visible
Adequate vacuum
Dirt on ceramic body
No burning or damage
Smooth and correct operation by
control power
Securely tied in proper place
Tight
Smooth and correct operation by
control power
No loose or missing parts
No dust or foreign matter
No excessive deformation or wear
Smooth operation
Test
> 0.6 inch over travel
10 - 32
36
VR-Series
FAILURE TO FOLLOW ANY OF THESE INSTRUCTIONS MAY CAUSE DEATH,
SEVERE PERSONAL INJURY, EQUIPMENT DAMAGE AND/OR IMPROPER
OPERATION. SEE SECTION 2 - SAFE PRACTICES FOR MORE INFORMATION.
6.1 INSPECTION FREQUENCY
The scheduled maintenance interval for the VR-Series+ circuit
breaker is once every ten years or ten thousand operations,
whichever comes first when applied in normal applications as
defined by IEEE C37 .04-1999. However, if the circuit breaker is
operating in a high level of natural elements or in a corrosive
environment, inspection should be performed twice each year. The
circuit breaker should also be inspected and a vacuum interrupter
integrity test performed (Section 6.3) any time the circuit breaker is
transported to another physical location or switchgear assembly. In
addition, the circuit breaker should have a full inspection if the circuit
breaker interrupts a fault current.
Refer to the table below for maintenance and inspection check points.
N
otte:
INSPECTION METHOD
Visual check
Visual check
Hi-pot Tester
Hi-pot Tester
Hi-pot Tester
Visual - Close the circuit breaker
and look for "T" cutout on Vacuum
Interrupter Assembly
(See Figure 6.1 and 6.2)
Visual (Figure 6.1 and 6.2)
See Section 6.3
Visual check
Visual check
Test closing and tripping of the circuit
breaker twice
Visual check
Visual check
Test closing and tripping of the circuit
breaker twice
Visual and tightening with appropriate
tools
Visual check
Visual and operational
Manual charging closing
and tripping
CloSure
Test 6.8.1
™
.25 - 20
.31 - 18
72
144
Instruction Book
IB182942EN July 2018 www.eaton.com
DST-2-VR
+
Replacement Circuit Breaker
DANGER
CORRECTIVE ACTION IF NECESSARY
Clean with lint-free cloth
Replace cracked unit
Clean and retest or replace
Clean and retest or replace
Clean and retest or replace
If cutout is not visible, replace Vacuum
Interrupter Assembly
Replace Vacuum Interrupter Assembly
Replace Vacuum Interrupter Assembly
If vacuum is not adequate
Clean with dry lint-free cloth
Replace if burned, damaged or eroded
Replace any defective device -
Identify per Trouble-Shooting Chart
Repair or tie as necessary
Tighten or replace if necessary
Replace brushes or motor
Tighten or reinstate if necessary
Clean as necessary
Remove cause and replace parts
Correct per Trouble-Shooting Chart
if necessary
If < 0.6 Contact the PBC
at 1-877-276-9379
.38 - 16
.50 - 13
300
540
+
27
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