ATCO ELECTRIC LTD. (Transmission System) SERVICE QUALITY AND RELIABILITY PERFORMANCE, MEASURES AND INDICES 2018-04-24 - Revision 0 EUB Decision 2007-071 Board Direction 52 For questions or comments regarding this report, contact: Michael Bischof, P.Eng., PMP Manager, Performance Engineering ATCO Electric Transmission 10035 105 Street NW Edmonton, AB T5J 2V6 (780) 420-3294 1
INTRODUCTION In EUB Decision 2007-071, Board Direction 52, the Alberta Energy and Utilities Board directed ATCO Electric (AE) to provide a comprehensive listing of all transmission related service quality and reliability measures or indices that are currently being prepared for external use, and any reports being prepared for internal use, that AE considers may be appropriate for this purpose. Further, the Board directed AE to file these measures, indices and reports in conjunction with AE s Annual Quality of Service Report. In compliance with EUB Decision 2007-071, Board Direction 52, ATCO Electric has compiled the attached report. 2
TABLE OF CONTENTS 1.0 DELIVERY POINT PERFORMANCE 4 1.1 Introduction 4 1.2 Performance Indices 4 2.0 AC MAJOR EQUIPMENT PERFORMANCE 12 2.1 Introduction 12 2.2 Definitions 12 2.3 AC Lines, Transformers & Breakers Performance (2017) 15 2.4 AC Lines, Transformers & Breakers Performance (2013-2017) 21 3.0 HIGH VOLTAGE DC PERFORMANCE (2017) 27 4.0 WECC REPORT 28 3
1.0 DELIVERY POINT PERFORMANCE 1.1 INTRODUCTION This section of the report deals with the measurement of actual reliability of ATCO Electric's Bulk Electricity System (BES) for the year 2017. It compares BES reliability for the last 5 years to indicate trends. A delivery point (DP) is considered interrupted when its voltage supply is interrupted due to a problem with the bus or due to problems within the BES. DP interruptions caused by problems originating on the customer s equipment or the distribution system are not considered, unless the BES fails to limit their impact to other delivery points. An interruption to a DP is defined as being momentary when the duration of the interruption is less than one minute. These are interruptions of a transient nature, generally restored by automatic reclosing or auto-sectionalizing facilities. A DP interruption is defined as being sustained when the loss of supply voltage to the DP has duration of one minute or more. 1.2 PERFORMANCE INDICES Standard performance indices have been calculated for 2017, as well as the 5-year period between 2013 and 2017, using statistics as reported to CEA. The data shown is produced using the latest CEA BES online tool where it generates reports identical to the traditional CEA format in real-time. 4
Transmission System Average Interruption Index Sustained Interruptions: T-SAIFI-SI = ( Sustained Interruptions) / (Delivery Point - Years) Unit: Interruptions per delivery point per year Table 1 T-SAIFI-SI Year T-SAIFI-SI 2013 0.46 2014 0.76 2015 0.51 2016 0.43 2017 0.41 Chart 1 T-SAIFI-SI 5
Transmission System Average Interruption Index Momentary Interruptions: T-SAIFI-MI = ( Momentary Interruptions) / (Delivery Point - Years) Unit: Interruptions per delivery point per year Table 2 T-SAIFI-MI Year T-SAIFI-MI 2013 0.87 2014 1.52 2015 0.88 2016 1.13 2017 0.56 Chart 2 T-SAIFI-MI 6
Transmission System Average Interruption Duration Index for BES : T-SAIDI (BES ) = (Sum of BES Interruption Durations) / (Delivery Point - Years) Unit: Minutes per delivery point per year Table 3 T-SAIDI (BES ) Year T-SAIDI-BES 2013 309.72 2014 652.01 2015 205.27 2016 444.36 2017 870.25 Chart 3 T-SAIDI (BES ) 7
Transmission System Average Interruption Duration Index for Customer Load: T-SAIDI (Customer Load) = (Sum of Customer Load Interruption Durations) / (Delivery Point - Years) Unit: Minutes per delivery point per year Table 4 T-SAIDI (Customer Load) Year T-SAIDI-Customer Load 2013 54.23 2014 154.67 2015 73.50 2016 32.53 2017 65.84 Chart 4 T-SAIDI (Customer Load) 8
System Average Restoration Index for BES : SARI (BES ) = (Sum of BES Interruption Durations) / ( Interruptions) Unit: Minutes per interruption Table 5 SARI (BES ) Year SARI-BES 2013 667.70 2014 862.81 2015 399.26 2016 1036.85 2017 2146.61 Chart 5 SARI (BES ) 9
System Average Restoration Index for Customer Load: SARI (Customer Load) = (Sum of Customer Load Interruption Durations) / ( Interruptions) Unit: Minutes per interruption Table 6 SARI (Customer Load) Year SARI-Customer Load 2013 116.91 2014 204.68 2015 142.97 2016 75.91 2017 162.40 Chart 6 SARI (Customer Load) 10
Delivery Point Unreliability Index: DPUI = (Total Unsupplied Energy in MW-Min) / (System Peak Load in MW) Unit: System Minutes Table 7 DPUI Year DPUI 2013 35.39 2014 88.89 2015 30.13 2016 21.63 2017 27.25 Chart 7 DPUI 11
2.0 AC MAJOR EQUIPMENT PERFORMANCE 2.1 INTRODUCTION This section of the report on the performance of transmission lines, transformers and circuit breakers is based on ATCO Electric s transmission equipment outage data for the period January 1, 2013 to December 31, 2017. For comparison purposes, one-year statistics for the 2017 operating year as well as the five-year average statistics for the 2013 2017 operating period are presented. The data shown is produced using the latest CEA ERIS online tool where it generates reports identical to the traditional CEA format in real-time. This report covers the outage statistics for transmission lines, transformers and circuit breakers with an operating voltage of 72 kv and above and includes sustained and momentary outage data for the period 2013 2017. Forced outages of transmission lines have been categorized into line - related and terminal - related outages. The transmission line performance statistics are given on a 100 kilometer-year basis for the line - related outages and on a terminal - year basis for terminal - related outages. Transformer performance statistics are summarized by voltage class. Forced outages involving integral sub-components (such as bushing) and terminal equipment (such as control and protection equipment) are combined in deriving transformer statistics. Circuit Breaker performance statistics are summarized by voltage class. Forced outages involving integral sub-components (such as bushing) and terminal equipment (such as control and protection equipment) are combined in deriving breaker statistics. 2.2 DEFINITIONS Transmission Equipment: As equipment with an operating voltage of 60 kv and above and includes those elements associated with transmission systems such as synchronous and static compensators and also shunt reactors and capacitors on the tertiaries of transformers of 60 kv and above. Major Component: A unit of Transmission Equipment, including all the associated auxiliaries that make it a functional entity within a power system. Subcomponent: The constituent components of a Major Component and includes those external elements which are associated with it. A Terminal: A transmission line end or cable end which is equipped with primary protection. A Unit of Transmission Equipment: A three-phase installation whether this installation is made up of one three-phase element or three single-phase elements. Primary Cause: The reason to which one can attribute the outage or malfunction of a Major Component. 12
Component Forced Outage: The automatic or emergency removal of a Major Component directly caused by defective equipment, adverse weather, adverse environment, system condition, human element or foreign interference. Recording is not done for the case of healthy Major Components which are removed from service as a result of cascading system events or as a result of the outage (or malfunction) of some other Major Component and recording is not done for manual removal of a component from service where that removal may be delayed more than thirty minutes to allow load transfer or other operations. Common Mode Outage: An event where more than one component forced outage results from a single primary cause and where the outages are not consequences of each other. Failure Mode: A description of the type of fault (or malfunction) which the system sustains as a result of a Component Forced Outage. Sustained Forced Outage: A transmission line related forced outage the duration of which is one minute or more. It does, therefore, not include automatic reclosure events. Transient Forced Outage: A transmission line forced outage the duration of which is less than one minute and is, therefore, recorded as zero. It covers only automatic reclosure events. Line Related Forced Outage means a forced outage which originated on the line (includes such items as structures, conductors, grounds, insulators, hardware). Terminal Related Forced Outage means a forced outage which originated on the line terminals (includes such items as protection equipment, PTs, CTs). Replacement Time: The elapsed time required to replace the Major Components from stock or other location in the network. Forced Available Time: The elapsed time required to restore the Major Component to service or to repair it in the case where it has been replaced. All events have a Forced Unavailable Time of minimum one minute with the exception of Automatic Reclosures on Transmission Lines which are reported as "zero" forced unavailable time. Kilometer Years (km.a): The summation of the product of the length in kilometers and the period duration in years for the transmission lines or cables under consideration. Terminal Year (a): The summation of the product of the number of terminals and the period duration in years, for the transmission lines or cables under consideration. A terminal refers to a transmission line of cable end which is equipped with primary protection. Component : The summation of the product of the number of units of a Major Component and the period of duration in years, for the major component under consideration. : The number of major component related forced outages which involved the indicated subcomponent or primary cause. 13
(per 100 km.a): The divided by Kilometer Years which are in turn divided by 100. (per a): The divided by Terminal Years or Component Years. Total Time (h): The sum of the forced unavailable times (in hours) of Major Component related forced outages involving the indicated subcomponent or primary cause. Forced unavailable time is the elapsed time required to completely restore a Major Component to service. Duration (h): The Total Time divided by the. Median Duration (h): The time at which fifty percent of the forced unavailable times are greater than this value and fifty percent are less. Unavailability (%): The product of and Duration in years expressed as a percentage. Op. Pos. (h): The mean time that the operating position was out of service. This time differs from Duration for those forced outages which resulted in the Major Component being removed from service and replaced with another. 14
2.3 AC LINES, TRANSFORMERS & BREAKERS PERFORMANCE (2017) The following content is extracted directly from the CEA ERIS tool. As such, section and table numbers have been retained to better facilitate future referral. Inventory Table 1 - Inventory of Transmission Equipment as of December 31, 2017 Transmission Lines Length (Km) Transmission Lines Primary Terminals Transmission Lines Tap Terminals Transformer Banks Circuit Breakers Up to 109 kv 801 35 16 41 74 110-149 kv 6,385 250 66 174 480 200-299 kv 3,505 135 2 47 201 300-399 kv 500-599 kv 4 4 0 2 18 Cables Length (Km) Cables Terminals Synchronous Compensators Up to 109 kv 1 Static Compensators 110-149 kv 4 200-299 kv 3 300-399 kv 500-599 kv Shunt Reactor Banks Shunt Capacitor Banks Up to 109 kv 17 4 Series Capacitor Banks 110-149 kv 2 45 150-199 kv 200-299 kv 3 2 300-399 kv 500-599 kv 600-799 kv Transmission Line Performance The transmission line performance statistics are given on a per 100 kilometer-year basis for line-related outages and on a per terminal-year basis for terminal-related outages. Table 2 - Summary of Transmission Line Statistics for Line-Related Sustained Forced Kilometre Years (Km.a) Total Time (h) (Per 100 Km.a) Duration Unavailability (%) Up to 109 kv 799 13 248 1.6274 19.0 0.354 110-149 kv 6,367 35 230 0.5497 6.6 0.041 200-299 kv 3,495 5 96 0.1430 19.2 0.031 500-599 kv 4 0 0 0.0000 0.0 0.000 15
of line-related sustained outages of transmission lines by voltage classification. Table 3 - Summary of Transmission Line Statistics for Line-Related Transient Forced Kilometre Years (Km.a) Number of (Per 100 Km.a) Unavailability Up to 109 kv 799 26 3.2549 0.000 110-149 kv 6,367 38 0.5968 0.000 200-299 kv 3,495 0 0.0000 0.000 500-599 kv 4 0 0.0000 0.000 Table 4 - Summary of Transmission Line Statistics for Terminal-Related Forced Primary Terminals Terminal Total Time (h) Duration (h) Unavailability (%) Up to 109 kv 34.9 33 50 0.9455 1.5 0.016 110-149 kv 249.3 66 112 0.2647 1.7 0.005 200-299 kv 134.6 10 50 0.0743 5.0 0.004 500-599 kv 4.0 0 0 0.0000 0.0 0.000 Tap Terminals Terminal Total Time (h) Duration (h) Unavailability (%) Up to 109 kv 16.0 0 0 0.0000 0.0 0.000 110-149 kv 65.8 0 0 0.0000 0.0 0.000 200-299 kv 2.0 0 0 0.0000 0.0 0.000 500-599 kv 0.0 0 0 0.0000 0.0 0.000 16
Transformer Bank Performance Transformer Bank performance statistics are shown by voltage classification and three-phase rating. The voltage classification refers to the system operating voltage at the high-voltage-side of the transformer. The three-phase rating is the MVA rating with all cooling equipment in operation. Table 5 - Summary of Transformer Bank Statistics by for Forced Involving Integral Subcomponents Component Total Time (h) Duration (h) Unavail - ability Up to 109 kv 41 0 0 0.0000 0.0 0.000 110-149 kv 174 4 10 0.0231 2.5 0.001 200-299 kv 46 3 1,941 0.0654 647.1 0.483 500-599 kv 2 0 0 0.0000 0.0 0.000 Table 6 - Summary of Transformer Bank Statistics by for Forced Involving Terminal Equipment Component Total Time (h) Duration (h) Unavail ability Up to 109 kv 41 2 7 0.0489 3.7 0.002 110-149 kv 174 13 27 0.0749 2.1 0.002 200-299 kv 46 3 59 0.0654 19.7 0.015 500-599 kv 2 0 0 0.0000 0.0 0.000 17
Table 7 - Summary of Transformer Bank Statistics by for Forced Involving Integral Subcomponents and Terminal Equipment Component Total Time (h) Duration (h) Unavailability Up to 109 kv 41 2 7 0.0489 3.7 0.002 110-149 kv 174 17 37 0.0980 2.2 0.002 200-299 kv 46 6 2,000 0.1308 333.4 0.498 500-599 kv 2 0 0 0.0000 0.0 0.000 of outages of transformer banks by voltage classification. 18
Circuit Breaker Performance Circuit Breakers are grouped by interrupting medium within each voltage classification. Table 8 - Summary of Circuit Breaker Statistics by for Forced Involving Integral Subcomponents Component Total Time (h) Duration (h) Unavail ability Up to 109 kv 72 1 1 0.0139 0.6 0.000 110-149 kv 477 0 0 0.0000 0.0 0.000 200-299 kv 200 0 0 0.0000 0.0 0.000 500-599 kv 18 0 0 0.0000 0.0 0.000 Table 9 - Summary of Circuit Breaker Statistics by for Forced Involving Terminal Equipment Component Total Time (h) Duration (h) Unavail ability Up to 109 kv 72 0 0 0.0000 0.0 0.000 110-149 kv 477 1 1 0.0021 0.8 0.000 200-299 kv 200 0 0 0.0000 0.0 0.000 500-599 kv 18 0 0 0.0000 0.0 0.000 19
Table 10 - Summary of Circuit Breaker Statistics by for Forced Involving Integral Subcomponents and Terminal Equipment Component Total Time (h) Duration (h) Unavail ability Up to 109 kv 72 1 1 0.0139 0.6 0.000 110-149 kv 477 1 1 0.0021 0.8 0.000 200-299 kv 200 0 0 0.0000 0.0 0.000 500-599 kv 18 0 0 0.0000 0.0 0.000 of outages of circuit breaker by voltage classification. 20
2.4 AC LINES, TRANSFORMERS & BREAKERS PERFORMANCE (2013-2017) The following content is extracted directly from the CEA ERIS tool. As such, section and table numbers have been retained to better facilitate future referral. Inventory Table 1 - Inventory of Transmission Equipment as of December 31, 2017 Transmission Lines Length (Km) Transmission Lines Primary Terminals Transmission Lines Tap Terminals Transformer Banks Circuit Breakers Up to 109 kv 801 35 16 41 74 110-149 kv 6,385 250 66 174 480 200-299 kv 3,505 135 2 47 201 300-399 kv 500-599 kv 4 4 0 2 18 Cables Length (Km) Cables Terminals Synchronous Compensators Up to 109 kv 1 Static Compensators 110-149 kv 4 200-299 kv 3 300-399 kv 500-599 kv Shunt Reactor Banks Shunt Capacitor Banks Up to 109 kv 17 4 Series Capacitor Banks 110-149 kv 2 45 150-199 kv 200-299 kv 3 2 300-399 kv 500-599 kv 600-799 kv Transmission Line Performance The transmission line performance statistics are given on a per 100 kilometer-year basis for line-related outages and on a per terminal-year basis for terminal-related outages. Table 2 - Summary of Transmission Line Statistics for Line-Related Sustained Forced Kilometre Years (Km.a) Total Time (h) (Per 100 Km.a) Duration Unavailability (%) Up to 109 kv 4,810 97 6,235 2.0165 64.3 1.480 110-149 kv 30,805 264 3,413 0.8570 12.9 0.127 200-299 kv 17,447 67 1,908 0.3840 28.5 0.125 500-599 kv 12 0 0 0.0000 0.0 0.000 21
of line-related sustained outages of transmission lines - 5 year trend by voltage classification. Table 3 - Summary of Transmission Line Statistics for Line-Related Transient Forced Kilometre Years (Km.a) Number of (Per 100 Km.a) Unavailability Up to 109 kv 4,810 345 7.1722 0.000 110-149 kv 30,805 318 1.0323 0.000 200-299 kv 17,447 38 0.2178 0.000 500-599 kv 12 0 0.0000 0.000 Table 4 - Summary of Transmission Line Statistics for Terminal-Related Forced Primary Terminals Terminal Total Time (h) Duration (h) Unavailability (%) Up to 109 kv 194.5 102 68 0.5244 0.7 0.004 110-149 kv 1,198.8 300 198 0.2503 0.7 0.002 200-299 kv 620.4 48 114 0.0774 2.4 0.002 500-599 kv 12.0 0 0 0.0000 0.0 0.000 Tap Terminals Terminal Total Time (h) Duration (h) Unavailability (%) Up to 109 kv 84.9 1 5 0.0118 5.1 0.001 110-149 kv 306.8 0 0 0.0000 0.0 0.000 200-299 kv 11.0 0 0 0.0000 0.0 0.000 500-599 kv 0.0 0 0 0.0000 0.0 0.000 22
Transformer Bank Performance Transformer Bank performance statistics are shown by voltage classification and three-phase rating. The voltage classification refers to the system operating voltage at the high-voltage-side of the transformer. The three-phase rating is the MVA rating with all cooling equipment in operation. Table 5 - Summary of Transformer Bank Statistics by for Forced Involving Integral Subcomponents Component Total Time (h) Duration (h) Unavail - ability Up to 109 kv 215 3 7,053 0.0139 2,351.1 0.373 110-149 kv 833 13 289 0.0156 22.2 0.004 200-299 kv 199 7 2,017 0.0352 288.1 0.116 500-599 kv 6 0 0 0.0000 0.0 0.000 Table 6 - Summary of Transformer Bank Statistics by for Forced Involving Terminal Equipment Component Total Time (h) Duration (h) Unavail ability Up to 109 kv 215 30 262 0.1394 8.7 0.014 110-149 kv 833 76 1,894 0.0913 24.9 0.026 200-299 kv 199 14 497 0.0704 35.5 0.029 500-599 kv 6 0 0 0.0000 0.0 0.000 23
Table 7 - Summary of Transformer Bank Statistics by for Forced Involving Integral Subcomponents and Terminal Equipment Component Total Time (h) Duration (h) Unavail ability Up to 109 kv 215 33 7,316 0.1534 221.7 0.388 110-149 kv 833 89 2,182 0.1069 24.5 0.030 200-299 kv 199 21 2,513 0.1056 119.7 0.144 500-599 kv 6 0 0 0.0000 0.0 0.000 of outages of transformer banks - 5 year trend by voltage classification. 24
Circuit Breaker Performance Circuit Breakers are grouped by interrupting medium within each voltage classification. Table 8 - Summary of Circuit Breaker Statistics by for Forced Involving Integral Subcomponents Component Total Time (h) Duration (h) Unavail ability Up to 109 kv 369 11 469 0.0298 42.6 0.014 110-149 kv 2,249 22 687 0.0098 31.2 0.003 200-299 kv 898 2 50 0.0022 25.2 0.001 500-599 kv 54 0 0 0.0000 0.0 0.000 Table 9 - Summary of Circuit Breaker Statistics by for Forced Involving Terminal Equipment Component Total Time (h) Duration (h) Unavail ability Up to 109 kv 369 1 44 0.0027 44.1 0.001 110-149 kv 2,249 29 1,523 0.0129 52.5 0.008 200-299 kv 898 6 50 0.0067 8.4 0.001 500-599 kv 54 0 0 0.0000 0.0 0.000 25
Table 10 - Summary of Circuit Breaker Statistics by for Forced Involving Integral Subcomponents and Terminal Equipment Component Total Time (h) Duration (h) Unavail ability Up to 109 kv 369 12 513 0.0325 42.7 0.016 110-149 kv 2,249 51 2,210 0.0227 43.3 0.011 200-299 kv 898 8 101 0.0089 12.6 0.001 500-599 kv 54 0 0 0.0000 0.0 0.000 of outages of circuit breaker - 5 year trend by voltage classification. 26
3.0 HIGH VOLTAGE DC PERFORMANCE (2017) Table below presents a summary of high voltage direct current system outages for 2017. Summary of High Direct Current System for 2017 Outage Type Total Time (hours) Forced 2 90 Scheduled 2 611 Note: The HVDC system performance above is for the period of January 1, 2017 to December 31, 2017. 27
4.0 WECC REPORT Table below presents a summary of vegetation related transmission line outages for 2017 as reported to WECC (Western Electricity Coordinating Council). Summary of Vegetation Related Transmission Line for 2016 Category Category 1 Grow-ins: caused by vegetation growing into lines from vegetation inside and/or outside of the right-of-way. Category 2 Fall-ins: caused by vegetation falling into lines from inside the right-ofway. Category 3 Fall-ins: caused by vegetation falling into lines from outside the right-ofway. RRO Designated Critical Lines <200 kv miles: 0 230 kv class miles: 2176 Transmission Lines 345 kv class miles: 0 500/765 kv class miles: 304 n/a 0 n/a 0 n/a 0 n/a 0 n/a 0 n/a 0 28