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50DH-VR-50AXU / 50XU / 75U / 75ARU - 600 / 1200A
Replacement Circuit Breaker
SECTION 6: INSPECTION & MAINTENANCE
DANGER
DO NOT WORK ON A CIRCUIT BREAKER IN THE "CONNECTED" 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.
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 Interrupters
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
Lubrication
Deformation Or Excessive Wear
Manual Operation
CloSure
™
BOLT SIZE
8 - 32
TORQUE Lb. In.
24
28
Instruction Book
CRITERIA
No Dirt
No Cracking
Withstand
27k 60Hz For 1 Minute
Withstand
15kV, 60Hz For 1 Minute
(5kV Rating)
27kV, 60Hz For 1 Minute
(15kV Ratings)
Withstand
1125V, 60Hz For 1 Minute
Contact Erosion Visibility Of Mark
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
Smooth Operation And No
Excessive Wear
No Excessive Deformation Or Wear
Smooth Operation
Test
> 0.6 Inch Over Travel
10 - 32
36
IB182012EN March 2017 www.eaton.com
STAND AT LEAST ONE METER AWAY FROM THE CIRCUIT BREAKER WHEN
TESTING FOR VACUUM INTEGRITY.
FAILURE TO FOLLOW ANY OF THESE INSTRUCTIONS MAY CAUSE DEATH,
SERIOUS BODILY INJURY, OR PROPERTY DAMAGE. SEE SECTION 2 - SAFE
PRACTICES FOR MORE INFORMATION.
6.1 INSPECTION FREQUENCY
Inspect the circuit breaker once a year when operating in a clean,
non corrosive environment. For a dusty and corrosive environment,
inspection should be performed twice a year. Additionally, it is
recommended to inspect the circuit breaker every time it interrupts
fault current.
Refer to the table below for maintenance and inspection check points.
N
ote:
INSPECTION METHOD
Visual Check
Visual Check
Hipot Tester
Hipot Tester
Hipot Tester
Visual - Close The Circuit Breaker And
Look For Green Mark On Moving Stem
From The Rear Of The Circuit Breaker
(See Figure 6.1 and 6.2)
Visual (Figure 6.3 and 6.4)
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
Sight And Feel
Visual And Operational
Manual Charging Closing
And Tripping
CloSure
Test 6.8.1
™
.25 - 20
.31 - 18
72
144
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 Mark Is Not Visible, Replace Interrupter
Assembly
Replace VI Assembly
Replace 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
Lubricate Very Sparingly
With Light Machine Oil
Remove Cause And Replace Parts
Correct Per Trouble-Shooting Chart
If Necessary
If < 0.6 Contact P.B.C.
At 1-877-276-9379
.38 - 16
.50 - 13
300
540
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