Analysis of Selected Motor Event and Starting Reports
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Copyright © SEL 2012
Analysis of Selected Motor Event and Starting Reports
Derrick Haas, Jason Young, and Ryan McDaniel
Schweitzer Engineering Laboratories, Inc.
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Discussion Topics
• Introduction
• Motor start and mechanical problem
• Current unbalance
• Self-balancing differential
• RTD protection
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Discussion Topics
• Full phase differential
• Loss of field
• Self-clearing fault
• Conclusions
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Introduction
• More than 85% of load for industrial users
• Response to failure – repair versus replace
• Root-cause analysis
• Event reports, motor trending data, load trending data
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Event 1: Event Report
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Motor Start Report (MSR) C
urre
nt (A
) or T
herm
al C
apac
ity U
sed
(per
cent
• 10
)
1800
1000
1400
00 10 50403020
1600
1200
200
400
600
800
60Time (s)
IA IB IC TCU • 10
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Time Versus Current Plot
Current (• FLA)
Tim
e (s
)
100
10
1
0.12 3 7654
Motor Thermal Limit Curve Relay Curve #3 Motor Starting
Current
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MSR From September C
urre
nt (A
) or T
herm
al C
apac
ity U
sed
(per
cent
• 10
)
1000
1400
00 10 50403020
1600
1200
200
400
600
800
60Time (s)
IA IB IC TCU • 10
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Summary of MSRs
Report Date Start Time (s)
Maximum Current (A)
MSR5 9/30/10 13.3 1,446
MSR4 10/12/10 15.5 1,492
MSR3 12/15/10 15.1 1,531
MSR2 12/15/10 11.3 1,506
MSR1 12/15/10 15.3 1,515
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MSR With Curve = 4 C
urre
nt (A
) or T
herm
al C
apac
ity U
sed
(per
cent
• 10
)
1000
1400
00 10 50403020
1600
1200
200
400
600
800
60Time (s)
IA IB IC TCU • 10
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Event 2: Phasor View
45 degrees
90
225
135
180
270
315
0
45IB(A)VBC(V)
VCA(V)
VAB(V)
IA(A)
IC(A)
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Relay Settings
• CT ratio = 50:5 (10)
• FLA = 38.9 A primary
• Negative-sequence pickup = 0.5 • FLA
• Negative-sequence definite-time delay = 0.1 s
• Current unbalance 46 pickup = 20%
• Current unbalance time delay = 5 s
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Negative-Sequence Overcurrent TRIP
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Event 3: Self-Balancing Differential C AB
16,000 hp Motor
87A
87B
87C
50:5
50:5
50:5
Conduit From Motor to Switchgear
Relay in Switchgear Door
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Filtered Event Report
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Raw Event Report
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Diagram With Short-Circuit Locations C AB
16,000 hp Motor
87A
87B
87C
50:5
50:5
50:5
Conduit From Motor to Switchgear
Relay in Switchgear Door
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Report After Correction
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Event 4: RTD Trending Data
RTD1 RTD2 RTD4 RTD5 RTD7 RTD8
Tem
pera
ture
(°C
)250
50
70
90
110
130
150
170
190
210
230
16:40 21:40 2:40 7:40 12:40 17:40 22:40 3:40 8:40 13:40 18:4023:40 4:405/20 5/21 5/22 5/23
Time of Day
RTD 1 RTD 2 RTD 4 RTD 5 RTD 7 RTD 8
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Event 5: Event Report
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A-Phase Currents P
rimar
y C
urre
nt (A
)
–4000
–3000
–2000
–1000
0
40003000
2000
1000
1514131211109876543210Time (cycles)
Winding 1 AWinding 2 A
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B-Phase Currents P
rimar
y C
urre
nt (A
)
–4000
–3000
–2000
–1000
0
40003000
2000
1000
1514131211109876543210Time (cycles)
Winding 1 BWinding 2 B
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C-Phase Currents P
rimar
y C
urre
nt (A
)
–4000
–3000
–2000
–1000
0
4000
3000
2000
1000
1514131211109876543210Time (cycles)
Winding 1 CWinding 2 C
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Solution 1: Time Delay
IN1600
0X Timer
XT
87R(Differential)
MTU3 (Trip 3to lock out relay)
MTU1 (Trip 1for event reports)
87U(Unrestrained
differential)
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Solution 2: Adjust Sensitivity
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Replay With Settings Change
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Event 6: One-Line Diagram
Motor Relay
87
Generator Relay
yM
x
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Event Report
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Normal Load Phasors 90
225
135
180
270
315
0
45
IBX(A)
VBCX(V)
VCAX(V)
VABX(V)
IAX(A)
ICX(A)
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90
225
135
180
270
315
0
45
IBX(A)
VBCX(V)
VCAX(V)
VABX(V)
IAX(A)
ICX(A)
Phasors During Loss-of-Field Event
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Event 7: Relay A Event Report
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Relay B Event Report
-400
-200
0
200
400
600
800
1000
1200
1 4 7 10 13 16 19 22
–
–
Cycles
Cur
rent
(A)
IA IB IC IA Differential IB Differential IC Differential
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Closer Look at Relay A Event Report
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14,000 hp Motor
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Incoming and Neutral Conductors
C-Phase Neutral Conductor
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Top View of Conductors
C-Phase Incoming Conductor
C-Phase Neutral Conductor
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C-Phase Incoming Conductor
Area of Deep Insulation Erosion
10 Inches of Visible Tracking Seen in the C-Phase Incoming Conductor
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Ground Point
C-Phase
Neutral Conductor
Burn Mark to Ground
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Fault Representation A CB
14,000 hp Motor
Moisture
Ground Connection
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Conclusions
• False trip or failure of a motor can halt a process
• Event reports should be analyzed in detail, regardless of company replacement policy for motors
• Lessons learned from event reports can be used to make operations safer and more reliable
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Questions?