transmission reliability community insights conference august 19-21, 2015 minneapolis, mn 2015...
TRANSCRIPT
Transmission Reliability
Community Insights Conference
August 19-21, 2015
Minneapolis, MN
2015 Electric T&D Benchmarking
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Agenda
◼ Overview Highlights for 2015 Transmission Reliability Benchmarking
◼ Performance Profiles & Trends Profile Measures, 2015 vs 2014
◼ 2015 Benchmarking Results Reliability Improvement Initiatives Analysis of Sustained Outage Causes Profile Trends
Overview
Highlights for 2015
◼ Improvement initiatives are focusing on improved processes, design changes, and increased maintenance. Vegetation management was mentioned more often this year than last.
◼ A significant percentage of sustained outages come from causes that can be considered “preventable”.
◼ We now have five years of relatively complete history of the Profile Metrics for Transmission Reliability. Most measures are either stable or improving; there is no clear trend.
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Transmission Line Reliability
Statistics◼ In general, for transmission lines, we are interested in availability, as impacted
by sustained outages that may or may not have an impact on an end-use customer.
◼ We ask for raw data on outages by voltage class. We have aligned the definitions with TADS for all voltages (even though TADS only applies to 200kV and above) Cause codes for all voltages based upon TADS “Automatic” operation replaces the terminology “unplanned” (with minor
impact on the values)◼ We have only asked for “automatic” outage data◼ Those codes that are “substation related” are reported in transmission lines, but
also in the used for profile measures in the substation section of the report◼ For Transmission reliability the term “outage” refers to a ‘component’ or line
outage (most of which may not have any customer impact). For instance, you might have had 10 transmission component outages last year but only 3 of them resulted in an outage to a customer.
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Profiles & Trends
Transmission Reliability Profile
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2014YE 2013YE Mean Q1 Q2 Q3 Bars Mean Q1 Q2 Q3 BarsTransmission Line Outages Element Sustained Outage Frequency -- <200kV 0.19 0.04 0.13 0.29 11 0.28 0.07 0.11 0.31 11Element Momentary Outage Frequency Rate -- <200kV 0.37 0.14 0.20 0.54 11 0.62 0.18 0.25 0.81 11Circuit Sustained Outage Frequency, Mileage Adjusted <200kV 1.94 0.98 1.86 2.92 11 2.29 1.02 2.20 3.19 11
Element Sustained Outage Duration Time <200kV 3.77 0.36 1.08 3.73 12 2.78 0.12 1.32 4.83 12Percentage of Elements with Zero Automatic Outages <200kV 0.66 0.85 0.72 0.54 10 0.64 0.83 0.67 0.46 10
Element Sustained Outage Frequency -- >200kV 0.28 0.08 0.18 0.32 12 0.26 0.04 0.13 0.41 12
Element Momentary Outage Frequency Rate -- >200kV 0.38 0.11 0.22 0.58 12 0.31 0.13 0.31 0.33 12
Circuit Sustained Outage Frequency, Mileage Adjusted -- >200kV 0.84 0.38 0.59 0.89 12 0.73 0.36 0.60 0.90 12
Element Sustained Outage Duration Time >200kV 6.16 0.72 1.60 3.05 12 2.59 0.06 0.89 4.23 12
Percentage of Elements with Zero Automatic Outages >200kV 0.70 0.84 0.74 0.54 12 0.76 0.91 0.78 0.68 12
Most Measures are somewhat improved for <200kV, somewhat worse for >200kV
< 200kv measures
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Sustained Outage Frequency Rate (SOF) < 200kv
Results much better than last year
Mean 0.29Quartile 1 0.07Quartile 2: 0.18Quartile 3: 0.42
This YearTransmission Reliability Report Page 4, Question TR15, ST120
Last Year
Mean 0.19Quartile 1 0.05Quartile 2: 0.15Quartile 3: 0.29
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Momentary outage frequency (MOF) < 200kv
Better this year, except first quartile
Mean 0.57Quartile 1 0.12Quartile 2: 0.24Quartile 3: 0.74
Mean 0.36Quartile 1 0.15Quartile 2: 0.20Quartile 3: 0.50
This YearTransmission Reliability page 5, Questions TR15. ST120
Last Year
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Sustained Outage Frequency, Mileage Adjusted (SCOF100ctmi) < 200kv
Results are considerably worse than last year
Mean 2.49Quartile 1 1.03Quartile 2: 2.35Quartile 3: 3.69
Mean 5.18Quartile 1 3.34Quartile 2: 4.75Quartile 3: 6.41
This YearTransmission Reliability page14, Questions TR15. ST120
Last Year
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Sustained Outage Duration Time (SODT) <200kv
Mean and top quartile are about the same; 2nd and 3rd quartile much better
Mean 3.32Quartile 1 0.26Quartile 2: 1.89Quartile 3: 5.53
Mean 3.50Quartile 1 0.29Quartile 2: 0.82Quartile 3: 2.22
This YearTransmission Reliability page 9, Questions TR5. ST120
Last Year
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Percent Of Circuits With Zero Interruptions (PCZO) < 200kv
Much better than last year.
Mean 68.01 %Quartile 1 87.50 %Quartile 2: 76.12 %Quartile 3: 57.50 %
Mean 64.14 %Quartile 1 83.20 %Quartile 2: 66.50 %Quartile 3: 46.48 %
This YearTransmission Reliability page 25, Questions TR45
Last Year
> 200kv measures
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Sustained Outage Frequency Rate (SOF) > 200kv
Results are a bit worse than last year
Mean 0.22Quartile 1 0.03Quartile 2: 0.08Quartile 3: 0.38
This YearTransmission Reliability Report Page 7, Question TR15, ST120
Last Year
Mean 0.27Quartile 1 0.09Quartile 2: 0.17Quartile 3: 0.32
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Momentary outage frequency (MOF) > 200kv
Somewhat worse this year, except 3rd quartile
Mean 0.28Quartile 1 0.09Quartile 2: 0.29Quartile 3: 0.33
Mean 0.38Quartile 1 0.11Quartile 2: 0.22Quartile 3: 0.58
This YearTransmission Reliability page 8, Questions TR35. ST120
Last Year
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Sustained Outage Frequency, Mileage Adjusted (SCOF100ctmi) > 200kv
Results are somewhat worse than last year, especially the first quartile
Mean 0.63Quartile 1 0.17Quartile 2: 0.51Quartile 3: 0.75
Mean 0.84Quartile 1 0.42Quartile 2: 0.61Quartile 3: 0.83
This YearTransmission Reliability page 17, Questions TR15. ST120
Last Year
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Sustained Outage Duration Time (SODT) >200kv
Results much worse than last year, except 3rd quartile
Mean 2.04Quartile 1 0.01Quartile 2: 0.19Quartile 3: 3.91
Mean 5.69Quartile 1 0.27Quartile 2: 1.21Quartile 3: 2.81
This YearTransmission Reliability page 11, Questions TR5. ST120
Last Year
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Percent Of Circuits With Zero Interruptions (PCZO) > 200kv
Not as good as last year.
Mean 70.97 %Quartile 1 83.90 %Quartile 2: 78.95 %Quartile 3: 54.00 %
Mean 76.44 %Quartile 1 90.60 %Quartile 2: 78.48 %Quartile 3: 68.43 %
This YearTransmission Reliability page 26, Questions TR45
Last Year
initiatives
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Successful Practices to Improve Reliability for Circuits
Better Maintenance 27,37,18,25,17Design Changes 38,40,23Process Improvement 38
ID Response
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Installing TWS automatic fault locating. Developing subgrade corrosion inspection and mitigation program with EPRI. Installing new EPRI-specified, high contamination coastal insulator designs developed in partnership with alliance manufacturers. Installing EPRI Insulator Contamination Monitoring System in contaminated coastal and industrial areas to indicate when washing is required to prevent flashovers
21ISO:9000 implementation, Identifying poor performing transmission circuits, adding a smart digital (ION) metering system, improve maintenance programs
23System upgrades, situational awareness, CCVT replacement
27 Reviewing lightning protection practices, use of IR and Corona for transmission patrols
37 Identify trends in outages to replace material most likely to fail
18 Expanded use of lightning arrestors, shunting of compression fittings, use of UAV for improved inspection
25 Not new, but we have an infrustructure replacment program, focused on key assets and asset types
17Utilizing LIDAR Survey Technology to evaluate ROW Condition, Sharing GIS switch location data with Member System personnel, andAnnual determination of the 10 worst performing lines for project development
Transmission Reliability Page 33, Question TR70
Successful Practices Used To Reduce Frequency and Duration Of Outages
22Transmission Reliability Pg 26
Source: TR50
Category Frequency Duration
Better Maintenance 38,32,21,27,37,17 38,21,27,37
Increased or Enhanced Vegetation Management
32,21,23,37,31,18,17
Design Changes 38,21,18 38,27,18,17
Root Cause Analysis 33 33,21
Process Changes 32,25 21,23,25,17
Detailed Results of these Questions are presented in the report (pages 31,32). Below is a summary of the categories of the results
analysis
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Transmission reliability Trends <200kV
Most measures are improving except Momentary Outage Frequency Rate, which is relatively unchanged.
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Transmission reliability Trends >200kV
Most measures are trending better. Momentary Frequency and Sustained Outage Duration Time are relatively flat.
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Total reported sustained outage events from all respondents
The bars shown in RED can be considered “preventable”, along with perhaps a few others. The four bars shown in RED account for almost 47% of all sustained outages.
Total Events = 215
Thank you for your Input and Participation!
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