ATCO ELECTRIC LTD. (Transmission System) SERVICE QUALITY AND RELIABILITY PERFORMANCE, MEASURES AND INDICES Revision 0

Transcription

1 ATCO ELECTRIC LTD. (Transmission System) SERVICE QUALITY AND RELIABILITY PERFORMANCE, MEASURES AND INDICES Revision 0 EUB Decision Board Direction 52 For questions or comments regarding this report, contact: Michael Bischof, P.Eng., PMP Manager, Performance Engineering ATCO Electric Transmission Street NW Edmonton, AB T5J 2V6 (780)

2 INTRODUCTION In EUB Decision , 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 , Board Direction 52, ATCO Electric has compiled the attached report. 2

3 TABLE OF CONTENTS 1.0 DELIVERY POINT PERFORMANCE Introduction Performance Indices AC MAJOR EQUIPMENT PERFORMANCE Introduction Definitions AC Lines, Transformers & Breakers Performance (2017) AC Lines, Transformers & Breakers Performance ( ) HIGH VOLTAGE DC PERFORMANCE (2017) WECC REPORT 28 3

4 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 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

5 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 Chart 1 T-SAIFI-SI 5

6 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 Chart 2 T-SAIFI-MI 6

7 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 Chart 3 T-SAIDI (BES ) 7

8 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 Chart 4 T-SAIDI (Customer Load) 8

9 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 Chart 5 SARI (BES ) 9

10 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 Chart 6 SARI (Customer Load) 10

11 Delivery Point Unreliability Index: DPUI = (Total Unsupplied Energy in MW-Min) / (System Peak Load in MW) Unit: System Minutes Table 7 DPUI Year DPUI Chart 7 DPUI 11

12 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, For comparison purposes, one-year statistics for the 2017 operating year as well as the five-year average statistics for the 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 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

13 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

14 (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

15 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 kv 6, kv 3, kv kv Cables Length (Km) Cables Terminals Synchronous Compensators Up to 109 kv 1 Static Compensators kv kv kv kv Shunt Reactor Banks Shunt Capacitor Banks Up to 109 kv 17 4 Series Capacitor Banks kv kv kv kv kv 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 kv 6, kv 3, kv

16 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 kv 6, kv 3, kv Table 4 - Summary of Transmission Line Statistics for Terminal-Related Forced Primary Terminals Terminal Total Time (h) Duration (h) Unavailability (%) Up to 109 kv kv kv kv Tap Terminals Terminal Total Time (h) Duration (h) Unavailability (%) Up to 109 kv kv kv kv

17 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 kv kv , kv 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 kv kv kv

18 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 kv kv , kv of outages of transformer banks by voltage classification. 18

19 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 kv kv kv 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 kv kv kv

20 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 kv kv kv of outages of circuit breaker by voltage classification. 20

21 2.4 AC LINES, TRANSFORMERS & BREAKERS PERFORMANCE ( ) 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 kv 6, kv 3, kv kv Cables Length (Km) Cables Terminals Synchronous Compensators Up to 109 kv 1 Static Compensators kv kv kv kv Shunt Reactor Banks Shunt Capacitor Banks Up to 109 kv 17 4 Series Capacitor Banks kv kv kv kv kv 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, , kv 30, , kv 17, , kv

22 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, kv 30, kv 17, kv Table 4 - Summary of Transmission Line Statistics for Terminal-Related Forced Primary Terminals Terminal Total Time (h) Duration (h) Unavailability (%) Up to 109 kv kv 1, kv kv Tap Terminals Terminal Total Time (h) Duration (h) Unavailability (%) Up to 109 kv kv kv kv

23 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 , , kv kv , kv 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 kv , kv kv

24 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 , kv , kv , kv of outages of transformer banks - 5 year trend by voltage classification. 24

25 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 kv 2, kv kv 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 kv 2, , kv kv

26 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 kv 2, , kv kv of outages of circuit breaker - 5 year trend by voltage classification. 26

27 3.0 HIGH VOLTAGE DC PERFORMANCE (2017) Table below presents a summary of high voltage direct current system outages for Summary of High Direct Current System for 2017 Outage Type Total Time (hours) Forced 2 90 Scheduled Note: The HVDC system performance above is for the period of January 1, 2017 to December 31,

28 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: 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