salt river project - wecc
TRANSCRIPT
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Salt River Project
HYBRID PROTECTION SYSTEM MAINTENANCE PROGRAM
BRANT HEAP
10/27/2020
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We are delivering today
More than 2 million people living in central Arizona receive water
and power from us.
WECC Reliability & Security Webinar, B.P. Heap, Oct. 27, 2020
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SRP’s Water Business• 8 dams and
reservoirs
• 1,300 miles of
canals and
laterals
• 800,000 acre-
feet of water
delivered
annually
WECC Reliability & Security Webinar, B.P. Heap, Oct. 27, 2020
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SRP’s Power Business• One of the
nation’s largest
public power
utilities
• Integrated utility
• 8,400 megawatts
available to serve
customers
WECC Reliability & Security Webinar, B.P. Heap, Oct. 27, 2020
PROTECTIVE RELAYS
6WECC Reliability & Security Webinar, B.P. Heap, Oct. 27, 2020
• Prevent cascading outages and limit equipment damage
• Must be effectively maintained to ensure proper performance
The key is finding the right balance; test frequently enough to find likely problems, but not
more than necessary
ABOUT SRP’s PROTECTIVE RELAYS
7WECC Reliability & Security Webinar, B.P. Heap, Oct. 27, 2020
15,000 relays
20% are subject to NERC PRC-005-6
80% not subject to NERC PRC-005-6
Electro-mechanical
43%
Micro-processor
47%
Solid State10%
RELAYS BY TECHNOLOGY
EXISTING PROTECTION SYSTEM MAINTENANCE PROGRAM
8WECC Reliability & Security Webinar, B.P. Heap, Oct. 27, 2020
• Established according to the North American Electric Reliability Corporation (NERC) PRC-005-6 Standard.
• Defines maintenance requirements for all relays regardless of NERC classification.
• Exclusively time-based maintenance without monitoring• Relays and associated systems maintained every 5 years, not to
exceed 6.
PRC-005-6 OPTIONAL MAINTENANCE METHODS
WECC Reliability & Security Webinar, B.P. Heap, Oct. 27, 2020 9
• Time-Based Maintenance (TBM)
• Condition-Based Maintenance (CBM)
• Time-Based with monitoring
• Performance-Based Maintenance (PBM)
PRC-005-6 TIME-BASED MAINTENANCE
WECC Reliability & Security Webinar, B.P. Heap, Oct. 27, 2020 10
• Intervals are fixed
• Up to 6-year interval for relays
• Maintained regardless of need
• Unmonitored relays not in performance-based maintenance
PRC-005-6 CONDITION-BASED MAINTENANCE
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• Time-based with monitoring
• Continuously monitoring to know functional condition
• Up to a 12-year interval for relays
PRC-005-6 PERFORMANCE-BASED MAINTENANCE
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• No monitoring needed
• Intervals based on Segment maintenance performance
• Segment >= 60 Components
• Up to a 20-year interval, must maintain minimum 5% annually
• If failure rate >4%, create plan to reduce failure rate (can’t exceed 4% failure rate for 3 consecutive years)
ANALYSIS OF OPTIONAL MAINTENANCE METHODS
13WECC Reliability & Security Webinar, B.P. Heap, Oct. 27, 2020
Condition-Based Maintenance (CBM)
• All relays went through a high-level capability analysis
• Most microprocessor relays found capable
• Most capable relays were already monitored
Performance-Based Maintenance (PBM)
• All relays went through a high-level capability analysis
• 38 possible Segments were identified
• 1 Segment was selected
nerc_bes operation_style relay_type manufacturer model
Distinct
(3**)
Freq.
Proposed
Segment
5%
Sample
Sample
1/12
Sample
Size
(>=30)
No Electromechanical ACR-11B GENERAL ELECTRIC 12ACR11B2A 99 RSeg001 4.95 8.25 30
No Electromechanical CO-11 WESTINGHOUSE 1875298A 138 RSeg002 6.9 11.5 30
No Electromechanical CO-11 WESTINGHOUSE 1875299A 88 RSeg003 4.4 7.333333 30
No Electromechanical CO-11 WESTINGHOUSE 265C047A07 570 RSeg004 28.5 47.5 30
No Electromechanical CO-11 WESTINGHOUSE 265C047A11 262 RSeg005 13.1 21.83333 30
No Electromechanical CO-9 WESTINGHOUSE 1875282A 85 RSeg006 4.25 7.083333 30
No Electromechanical CO-9 WESTINGHOUSE 264C901A03 310 RSeg007 15.5 25.83333 30
No Electromechanical CP WESTINGHOUSE 289B415A14A 109 RSeg008 5.45 9.083333 30
No Electromechanical IAC-53B GENERAL ELECTRIC 12IAC53B104A 66 RSeg009 3.3 5.5 30
No Electromechanical IAC-53B GENERAL ELECTRIC 12IAC53B803A 134 RSeg010 6.7 11.16667 30
No Electromechanical IAC-66B GENERAL ELECTRIC 12IAC66B1A 66 RSeg011 3.3 5.5 30
No Electromechanical IAC-77A GENERAL ELECTRIC 12IAC77B39A 91 RSeg012 4.55 7.583333 30
No Electromechanical IAC-77B GENERAL ELECTRIC 12IAC77B806A 96 RSeg013 4.8 8 30
No Electromechanical IAC-77B GENERAL ELECTRIC 12IAC77B811A 128 RSeg014 6.4 10.66667 30
No Electromechanical IFC-53A GENERAL ELECTRIC 12IFC53A2A 163 RSeg015 8.15 13.58333 30
No Electromechanical IFC-77A GENERAL ELECTRIC 12IFC77A1A 225 RSeg016 11.25 18.75 30
No Electromechanical RC WESTINGHOUSE 1876019 179 RSeg017 8.95 14.91667 30
No Electromechanical RC WESTINGHOUSE 1346D28A01 165 RSeg018 8.25 13.75 30
No electromechanical STD-15C GENERAL ELECTRIC 12STD15C5A 265 RSeg019 13.25 22.08333 30
No Microprocessor 351 SCHWEITZER SEL-351 105 RSeg020 5.25 8.75 30
No Microprocessor 352 SCHWEITZER SEL-352 349 RSeg021 17.45 29.08333 30
No Microprocessor 387 SCHWEITZER SEL-387 232 RSeg022 11.6 19.33333 30
No Microprocessor 501 SCHWEITZER SEL-501 290 RSeg023 14.5 24.16667 30
No Microprocessor 300G SCHWEITZER SEL-300G 75 RSeg024 3.75 6.25 30
No Microprocessor 311A SCHWEITZER SEL-311A 327 RSeg025 16.35 27.25 30
No Microprocessor 311C SCHWEITZER SEL-311C 102 RSeg026 5.1 8.5 30
No Microprocessor 311L SCHWEITZER SEL-311L 444 RSeg027 22.2 37 37
No Microprocessor 351S SCHWEITZER SEL-351S 1064 RSeg028 53.2 88.66667 89
No Microprocessor 387A SCHWEITZER SEL-387A 189 RSeg029 9.45 15.75 30
No Microprocessor B30 GENERAL ELECTRIC B30 68 RSeg030 3.4 5.666667 30
No Microprocessor DPU 2000 ASEA BROWN BOVERI 487V1314-61111 179 RSeg031 8.95 14.91667 30
No Microprocessor L90 GENERAL ELECTRIC L90 259 RSeg032 12.95 21.58333 30
No Microprocessor SR469 GENERAL ELECTRIC SR469 88 RSeg033 4.4 7.333333 30
No Microprocessor SR750 GENERAL ELECTRIC SR750 96 RSeg034 4.8 8 30
No Microprocessor T60 GENERAL ELECTRIC T60 77 RSeg035 3.85 6.416667 30
No Solid State BE1-81 BASLER T1EE1EB0N1F 126 RSeg036 6.3 10.5 30
No Solid State MICRO-51-FT ASEA BROWN BOVERI 446F1201 96 RSeg037 4.8 8 30
A PERFORMANCE-BASED MAINTENANCE SEGMENT
WECC Reliability & Security Webinar, B.P. Heap, Oct. 27, 2020 14
ANALYSIS CONCLUSION
15WECC Reliability & Security Webinar, B.P. Heap, Oct. 27, 2020
• Time-Based only
• All relays on 6-year interval
Old Program New Hybrid Program
• Time-Based: Unmonitored relays on 6-year interval
• Condition-Based: Monitored relays on a 12-year interval
• Performance-Based: Electroswitch lockout relays on a 12-year interval
SRP’S BENEFITS OF A HYBRID MAINTENANCE PROGRAM
16WECC Reliability & Security Webinar, B.P. Heap, Oct. 27, 2020
• Reduce risk associated with unnecessary maintenance
• Extend maintenance intervals up to 220%
• Reduce maintenance workload up to 30% annually
• Reduce costs up to $1,000,000 annually
• Realign technician resources
BENCHMARKING OUR ANALYSIS & CONCLUSION
17WECC Reliability & Security Webinar, B.P. Heap, Oct. 27, 2020
• SRP’s hybrid program was established in accordance with PRC-005-6
• Supported by Western Electricity Coordinating Council (WECC)
• Some North American Transmission Forum (NATF) participating utilities have successfully used a hybrid program for years
• Their hybrid programs are nearly identical to SRP’s
WHERE ARE WE TODAY?
• Hybrid maintenance program implemented 5/1/2021
• All unmonitored relays remain on a not-to-exceed 6-year interval (time-based maintenance approach)
• Monitored transmission and distribution microprocessor relays are now on a not-to-exceed 12-year interval (condition-based maintenance)
• Electroswitch Series 24 lockout relays are individually tracked and on a not-to-exceed 12-year interval (performance-based maintenance approach)
18WECC Reliability & Security Webinar, B.P. Heap, Oct. 27, 2020
NEXT STEPS
• Continuous evaluation of the implemented hybrid maintenance program through analysis of relay performance and stakeholder feedback
• Evaluate the feasibility and benefits of extending relay maintenance intervals for SRP generating facilities
• Evaluate the benefits of applying performance-based maintenance to more relay segments
19WECC Reliability & Security Webinar, B.P. Heap, Oct. 27, 2020
?? Questions ??