27
Instruction Book
IB182942EN July 2018 www.eaton.com
DST-2-VR
+
VR-Series
+
Replacement Circuit Breaker
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.
DANGER
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- 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.
otte:
N
Refer to the table below for maintenance and inspection check points.
6.2 INSPECTION AND MAINTENANCE PROCEDURES
NO. / SECTION
INSPECTION ITEM
CRITERIA
INSPECTION METHOD
CORRECTIVE ACTION IF NECESSARY
1. Insulation
Stand Off Insulators, Operating Rods,
Tie-Bars and Barriers
No dirt
Visual check
Clean with lint-free cloth
No cracking
Visual check
Replace cracked unit
Vacuum Integrity
Between main circuit with
terminals ungrounded
Withstand
27kV 60Hz for 1 Minute
Hi-pot Tester
Clean and retest or replace
Insulation Integrity
Main circuit to ground
Withstand
15kV, 60Hz for 1 Minute
(5kV Rating)
Hi-pot Tester
Clean and retest or replace
Control circuit to ground
(Charging Motor disconnected)
Withstand
1125V, 60Hz for 1 Minute
Hi-pot Tester
Clean and retest or replace
2. Power Element
Vacuum Interrupter Assembly
Contact erosion visibility
Visual - Close the circuit breaker
and look for “T” cutout on Vacuum
Interrupter Assembly
(See Figure 6.1 and 6.2)
If cutout is not visible, replace Vacuum
Interrupter Assembly
Contact wipe visible
Visual (Figure 6.1 and 6.2)
Replace Vacuum Interrupter Assembly
Adequate vacuum
See Section 6.3
Replace Vacuum Interrupter Assembly
If vacuum is not adequate
Dirt on ceramic body
Visual check
Clean with dry lint-free cloth
Primary Disconnects
No burning or damage
Visual check
Replace if burned, damaged or eroded
3. Control Circuit Parts
Closing and tripping devices
including disconnects
Smooth and correct operation by
control power
Test closing and tripping of the circuit
breaker twice
Replace any defective device -
Identify per Trouble-Shooting Chart
Wiring
Securely tied in proper place
Visual check
Repair or tie as necessary
Terminals
Tight
Visual check
Tighten or replace if necessary
Motor
Smooth and correct operation by
control power
Test closing and tripping of the circuit
breaker twice
Replace brushes or motor
Tightness of hardware
No loose or missing parts
Visual and tightening with appropriate
tools
Tighten or reinstate if necessary
4. Operating Mechanism Dust or foreign matter
No dust or foreign matter
Visual check
Clean as necessary
Deformation or excessive wear
No excessive deformation or wear
Visual and operational
Remove cause and replace parts
Manual operation
Smooth operation
Manual charging closing
and tripping
Correct per Trouble-Shooting Chart
if necessary
CloSure
™
Test
> 0.6 inch over travel
CloSure
™
Test 6.8.1
If < 0.6 Contact the PBC
at 1-877-276-9379
otte:
N
Contact Eaton for any mechanism maintenance other than adjustment or replacement of control components.
BOLT SIZE
8 - 32
10 - 32
.25 - 20
.31 - 18
.38 - 16
.50 - 13
TORQUE Lbs. In.
24
36
72
144
300
540
