Doble Engineering Company 1 INSITE Circuit Breakers Presentation IEEE/PES Pittsburgh, PA 11/11/99 A. Wilson/Doble Engineering Company DAU Recordings Communication Network INSITE Server
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Doble Engineering Company 1
INSITE
Circuit Breakers Presentation IEEE/PES Pittsburgh, PA
11/11/99 A. Wilson/Doble Engineering Company
DAU
Recordings
Communication Network
INSITE Server
Doble Engineering Company 2
INSITE
Diagnostics For Substation Apparatus
Diagnostics NOT Data
Circuit Breakers Transformers Bushings
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Power Factor Rate of Change Power Factor Rate of Change
(4/21/98 - 5/07/98)
1 26 51 76 101 126 151 176 201 226 251 276 301 326 351
Hourly recording #
PF ra
te o
f cha
nge
[%/m
onth
]
High Change Alert
Medium Change Alert
Low Change Alert
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Feature Analysis EXPERT SYSTEM ALERT! Generator
Data Archive Browser
INSITE Server
Recordings
Multiple Locations-One Remote Server
Client Communications FAX ALERTS!
LAN
Recordings
One Substation-One Local Server
Expandable Up To 63 DAUs
Telephone Communication
Network
Telephone Communication
Network
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CIGRE Failure Analysis Study Control Circuits Major Failures - 30% Minor Failures - 20%
Main Contacts Major Failures - 15% Minor Failures - 10%
Motion Major Failures - 12% Minor Failures - 6%
Ancillary Equipment Major Failures - 31% Minor Failures - 28%
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Circuit Breaker Measurements
Control Circuits 52-A and 52-B Auxiliary Contact Status Trip and Close Coil Currents
Main Contacts Trip and Close Coil Currents Phase Currents A,B, and C
Insulation Bushings - PF and Capacitance
Motion Breaker Mechanism-Total-Travel, Over-Travel, Rebound, and Velocity
Ancillary Equipment Motor Current Pressure - SF6, Air Tank, or Hydraulic Heater Status Temperature - Ambient, SF6 Tank, or Cabinet
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Identified Problems/Failures
Control Circuits (2) Fails to Trip on Command Fails to Close on Command Control Circuit Performance
Main Contacts Current Interruption/Initial Performance Contact Erosion Re-strike
Insulation (3) Deteriorated Insulation Change in PF/Capacitance
Motion (2) Mechanism Performance - Lubrication, Damping, and Binding
Ancillary Equipment (15) Performance - Stored Energy, Pressure,Motor and Heaters
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Contact Malfunction Breaker Type: Air-Blast Multi-Interrupter Breaker Four of the interrupting contacts along with the isolating contacts did not operate initially
0 50 100 150 200 250 300 350 400 450 500-10
0
10
20Trip Coil Currents
0 50 100 150 200 250 300 350 400 450 500-10
0
10
20
Am
ps
0 50 100 150 200 250 300 350 400 450 500-10
0
10
20
ms
9
Contact Malfunction Total Trip Coil Time for each phase. 130+ operations in a 3 year period. The spike indicates the pole disagreement on Phase B.
01/01/97 01/01/98 01/01/99 01/01/000
50
100
150
200
250
300
Time
ms
Total Time - Trip Coils
Phase B Stuck
Doble Engineering Company
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Contact Malfunction The trace of Phase B indicates re-ignition of current
0 50 100 150 200 250 300 350 400 450 500-1000
0
1000
Phase Currents
0 50 100 150 200 250 300 350 400 450 500-1000
0
1000
Am
ps
0 50 100 150 200 250 300 350 400 450 500-1000
0
1000
ms
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Interrupting Time of the Main Contacts Varies slightly with load current. Repeatable. The interrupting time did not indicate pole disagreement
01/01/97 01/01/98 01/01/99 01/01/0010
12
14
16
18
20
22
24
26
28
30
Time
ms
Current Interruption Time
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Motion Future analysis may have to incorporate seasonal adjustments
Jan Apr Jul Oct Jan Apr Jul 7.888
7.889
7.89
7.891
7.892
7.893
7.894
7.895
7.896
7.897
7.898
Time
Inch
es
SF6 Breaker
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SF6 Pressure (Hourly)
10
11
12
13
14
15
16
17
18
12/2
2/98
12/2
4/98
12/2
6/98
12/2
7/98
12/2
8/98
12/2
9/98
12/3
0/98
12/3
1/98
1/1/
99
1/2/
99
1/3/
99
1/4/
99
1/5/
99
1/6/
99
1/7/
99
1/8/
99
Data Points
PSI
"Compensated"
"Uncompensated
3 day alert
20 hr alert
Low pressure alarm
LP Alarm and Final Alert Level
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Motor Recording Belt Slipping
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INSITE Diagnostics
Linked To: Failure Statistics Reliability Maintenance
Using: Statistics within Context of Limits Compensation for Operating Conditions
To Give: Conditioned Based Maintenance
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Conclusion
Breakers have extremely repeatable functionality.
INSITE sensors are robust and sensitive enough.
Diagnostics must be focused
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