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Home My WebLink About20170303IPC to Tidwell Attachment 18.2.pdf••'-4;: w ¦ Addendum To The Final Report (Electrical Reliability Study) & IDAHO POWER COMPANY STRUCTURAL RELIABILITY AND RISK ASSESSMENT OF THE WOOD RIVER -KETCHUM 138 kV LIN^#433 m m December 1993 IKS ^--v.? II EDM ENGINEERING DATA MANAGEMENT,INC. 4700 McMurray Avenue Fort Collins,Colorado 80525 (303)223-0457 FAX (303)223-0484 --- RELIABILITY AND RISK ASSESSMENT Electrical Reliability Idaho Power Company outage records for the Wood River to Ketchum 138kV Transmission Line were examined for the years 1980 through 1993.Only two outages were noted for this period.Of these two outages,one event was caused by weather (heavy snow)and one event by switching operations.No outages during the last 14 years were the result of lightning,an extraordinary record. As a comparative study,in an effort to establish a baseline level of electrical reliability, outage performance data from the Mid-America Interconnected Network (MAIN)and Mid-Continental Power Pool (MAPP)was obtained.The available MAIN data is for 1986 only and the MAPP data is for 1977 through 1986.A brief summary of the outage rates (per 100 miles per year)for the MAPP and MAIN data follows: MAPP Planned Outage Rate 3.80 Forced Outage Rate 3.11 Total 6.91 MAIN Planned Outage Rate 4.74 Forced Outage Rate 1.42 Total 6.16 The Wood River to Ketchum 138kV Transmission Line was also analyzed using EPRI MULTIFLASH software to estimate lightning performance.Table 1 illustrates the results of this analysis for a tangent H-frame structure,with unbonded crossarms,using 65'poles, the predominant structure type and pole height.The actual results are included in the appendix. Table 1 PREDICTED LIGHTNING OUTAGE RATE (Flashovers per 100 miles per year) FOOTING UNBONDED CROSSARM (2) KERAUNIC LEVEL (3)RESISTANCE (1) Resistance Percentage 10 15 20 25 Ohms 15 50 Ohms 40 100 Ohms 35 2.16 3.2 4.24 200 Ohms 5 400 Ohms 5 Notes:(1)See Table 2 for measured resistivity. (2)Backflashes occur across insulator strings and along crossarms to pole grounds. (3)Thunderstorm days per year. The following observations can be made by comparing the actual line outage performance to the MAPP and MAIN data,and the predicted lightning outage rates: The actual lightning rates are much lower than the predicted values. The geography ofthis particular line may account for the absence of lightning related outages. The unbonded crossarm increases the insulating value of the structure limiting the incidence of flashover. The footing resistances used in the lightning outage performance analysis are from the measured resistivity values in Table 2 and Figure 1.These values illustrate a considerable range of resistances for the soil types encountered along the line. Conclusion The outage records speak for themselves.Two outages in the past fourteen years for a total duration of three minutes include one weather related outage,attributed to heavy snow,and one switching outage.The low incidence of lightning in this area combined with the line's proximity to the mountains and relatively good condition of the entire power line give the Wood River to Ketchum 138kV Transmission Line an operating record that is practically unsurpassable. PEI-HLY 22-474 (12/28/93)248158-01-22-01-01 lrh IDAHO POWER CO.,WOOD RIVER to KETCHUM 138kV TRANSMISSION LINE MEASURED SOIL RESISTIVITY VALUES by POWER ENGINEERS,INC. Measured Resistance (Ohms)2-Layer Equivalent (Ohm-Meters)Calculated Resistivity (Ohm-Meters) 40"30'20'10'40*TOP LAYER BOTTOM 5'20'30*TOP5'10'STRUCTURE SPACINGSPACINGSPACINGSPACINGSPACINGLAYERSPACINGSPACINGSPACINGSPACINGSPACINGDEPTH(ft)LAYER 6.6210.1321.268.2126.2507.46 13.20 1338.00 351.404931209.23 1306.97 812.54 582.39 13.36 7.32797.8253559.58 9.40 2535.00 486.505152424.21 1874.21 1034.84 768.08 0.436 0.3990.5441.0710.00 27.41 3.4525.07 30.59 27.4151933.06 20.52 20.85 11.6817.7433.3105.47.70 852.60 289895.33 2912.005272769.16 2019.86 1276.30 1019.89 4.195.187.3916.9346.50.00 343.40 343.40445.56 321.18543324.44 283.24 297.80 0.5750.731.7195.46136.50 38.96 13.7141.97 44.08 9.00559131.37 104.63 65.88 1.075.33 2.2117.712.00 421.60 43.282.02 56.70573413.94 339.20 204.29 127.06 TABLE 2 PEI-HLY (12/28/93)2 18158-01 Irti U:\TDES\lDAHOPWR\RESTVTY.XLS IDAHO POWER COMPANY WOOD RIVER to KETCHUM 138kV TRANSMISSION LINE 3000.00 I A: 2500.00 til-.-| 2000.00 MEASURED RESISTIVITY 1500.00 (OHM-METERS) i*l 1000.00 500.00 TT7 r.fj C-~YSr 5 FEET 10 FEET W 20 FEET F 30 FEET 40 FEET PROBE SPACING 0.00 r*i a\io H r-IO (N On TRANSMISSION LINE STRUCTURE Ir^ ?40 FEET ¦30 FEET ¦20 FEET ?10 FEET El 5 FEET PEI-HLY (12/28/93)248158-01-22-01-01 Irti U:\TDES\IDAHOPWR\WR KRSTY.XLC FIGURE 1 OUTAGE REPORT L L t I 1PAGE IDAHO POWER COMPANY TRANSMISSION OUTAGE REPORTING SYSTEM JUMBO REPORT 01/01/B0 TO 12/27/93CONSTRAINTS...TIME PERIOD: CAUSE CODE: OPERATION TYPE:ALL FACILITIES: VOLTAGE: ALL ALL 138 DESCRIPTION:KETCHUM-ttOOD RIVER 13BKV LINE DURATION SUB1 SUB2 SUB3 §OPN DATE TIME HRS:Ml OPERATION REMARKS :01 SWITCH03/23/90 0621 03/23/90 0621 03/23/90 0621 CAUSE:OTHER CLOSING A BYPASS AIRBREAK IN ORDER TO PICK UP THE WOOOR 1 VER-S I LVER 138KV LINE. KCHM WDRI EKHN KCWrf :01 :01 03/04/9 1 1266 03/04/61 1256 03/04/91 1256 CAUSE:WEATHER HEAVY SNOW IN THE WOOCRIVER AREA.:02 FAULT KCHM WDR1 KCHM EKHN 102 102 TOTAL TRIP/CLOSE:DURATION:TOTAL OUTAGES::032 0 AVGi :01 12/27/9 T0RRPT1 RUN ON: PROGRAM: USERIO:SJN1002 93 AT 10.21.09 FOCEXEC [ APPENDIX r FLASH *****Version 4.01MULTI EPRI Lighting Outage Rate Calculation Program RP1284-3 &RP2151-1 IDAHO POWER,WOOD RIVER-KETCHUM 138KV TRANSMISSION LINETITLE: Echo of Input Data t r 10.0 Thunder Days per Year 12.4 Miles Keraunic Level ...: Line Length : Data for the 2 Shield Wires: Node Lateral No.Distance(ft)Height(ft)Diam(in)Sag(ft)Name 26.00 3/8HS 26.00 3/8HS .360 .360 59.00 59.00 1 -6.80 6.802 Data for the 3 AC Phases and 0 DC Poles: Voltage Height (ft)(kV)Angle Sag(ft) Node Lateral No.Distance(ft) 240.B 0.A 120.C 3 -13.50 45.50 45.50 45.50 138.0 138.0 138.0 30.00 30.00 30.00 4 .00 13.505 No.Bundle Cond Dia(in) Node No.Diam(in)Name Insulators No.Len.(in) Series Wood (ft) .563 .563 .563 3 1 .6 9PENGUIN PENGUIN PENGUIN 5.74 5.74 5.74 6.8 4 .61 9 6.8 5 1 .6 9 6.8 i | L r FLASH *****Version 4.01MULTI f EPRI Lighting Outage Rate Calculation Program RP1284-3 &RP2151-1 IDAHO POWER,WOOD RIVER-KETCHUM 138KV TRANSMISSION LINETITLE: Echo of Input Data (Continued) 82TowerType Tower Height Number of Nodes... 58.50 (ft) 5 Data for the 5 Tower Elements: No.Node A Node B Length(ft)Diam(ft)Sparsity .33 1136.89 14.44 6.89 45.28 45.28 1 .33 1221 .33 1243 .333 145 .33 1455 Conductor at Node Flashes to Tower Node 3 3 4 3 5 4 Surge Footing Resistance Connected to Node 5 Footing R (ohms) Frequency of Occurrence 25.0 50.0 100.0 200.0 400.0 .1500 .4000 .3500 .0500 .0500 L r FLASH *****Version 4.01MULTI r EPRI Lighting Outage Rate Calculation Program RP1284-3 &RP2151-1 IDAHO POWER,WOOD RIVER-KETCHUM 138KV TRANSMISSION LINETITLE: Shielding Failure Flashover Rates NO SHIELDING FAILURES CALCULATEDr* Back Flashover Rates Backf lashes %of Total per Year BackflashesNodesFlashing .061 .097 .055 .016 .002 .033 .003 22.89 36.33 20.53 6.10 3 35 5 4 .7245 4 3 12.41 1.02 5 r 4 3 Total =.27 SUMMARY FOR TOTAL LINE LENGTH 10.00 Thunder Days per Year 12.40 Line Length (Miles) 1.63 Strokes to Line per Year .00 Shielding Failures per Year .27 Back Flashovers per Year .27 Combined Flashovers per Year L L FLASH *****Version 4.01MULTI EPRI Lighting Outage Rate Calculation Program RP1284-3 &RP2151-1 TITLE:IDAHO POWER,WOOD RIVER-KETCHUM 138KV TRANSMISSION LINE Echo of Input Data 15.0 Thunder Days per Year 12.4 Miles Keraunic Level...: Line Length : Data for the 2 Shield Wires: Node Lateral No.Distance(ft)Height(ft)Diam(in)Sag(ft)Name 26.00 3/8HS 26.00 3/8HS 59.00 59.00 .360 .360 1 -6.80 6.802 Data for the 3 AC Phases and 0 DC Poles: Node Lateral No.Distance(ft) Voltage Height (ft)(kV)Angle Sag(ft) 3 45.50 45.50 45.50 138.0 138.0 138.0 240.B 0.A 120.C -13.50 30.00 30.00 30.00 4 .00 5 13.50 Node No.Diam(in)Name Bundle Dia(in) Insulators No.Len.(in) SeriesNo. Cond Wood (ft ) 3 .563 .563 .563 .61 9 5.74 5.74 5.74 PENGUIN PENGUIN PENGUIN 6.8 4 .6 91 6.8 5 1 .6 9 6.8 I % ¦ L r FLASH *****Version 4.01MULTI f EPRI Lighting Outage Rate Calculation Program RP1284-3 &RP2151-1 IDAHO POWER,WOOD RIVER-KETCHUM 138KV TRANSMISSION LINETITLE: Echo of Input Data (Continued) PNp 82TowerType Tower Height Number of Nodes... 58.50 (ft) 5 Data for the 5 Tower Elements: No.Node A Node B Length(ft)Diam(ft)Sparsity 16.89 14.44 6.89 45.28 45.28 .33311 .33 1212 .33 1324 .33 1435 .33 1455 Flashes to Tower Node Conductor at Node 3 3 4 3 45 Surge Footing Resistance Connected to Node 5 Footing R (ohms ) Frequency of Occurrence 25.0 50.0 100.0 200.0 400.0 .1500 .4000 .3500 .0500 .0500 L L r PLASH *****Version 4.01MULTI EPRI Lighting Outage Rate Calculation Program RP1284-3 £RP2151-1 IDAHO POWER,WOOD RIVER-KETCHUM 138KV TRANSMISSION LINETITLE: Shielding Failure FlaBhover Rates NO SHIELDING FAILURES CALCULATED Back Flashover Rates Backflashes %of Total per Year BackflashesNodesFlashing 22.89 36.33 20.53 6.10 .092 .145 .082 .024 .003 .050 .004 3 35 5 4 !.7245 12.41 1.02 4 35 34 Total =.40 SUMMARY FOR TOTAL LINE LENGTH 15.00 Thunder Days per Year 12.40 Line Length (Miles) 2.44 Strokes to Line per Year .00 Shielding Failures per Year .40 Back Flashovers per Year I . .40 Combined Flashovers per Year I . L r FLASH *****Version 4.01MULTI EPRI Lighting Outage Rate Calculation Program RP1284-3 &RP2151-1 IDAHO POWER,WOOD RIVER-KETCHUM 138KV TRANSMISSION LINETITLE: Echo of Input Data Keraunic Level...: Line Length : 20.0 Thunder Days per Year 12.4 Miles Data for the 2 Shield Wires: Node Lateral No.Distance(ft)Height(ft)Diam(in)Sag(ft)Name 26.00 3/8HS 26.00 3/8HS .360 .360 59.00 59.00 1 -6.80 6.802 Data for the 3 AC Phases and 0 DC Poles: Voltage Height(ft)(kV)Angle Sag(ft) Node Lateral No.Distance(ft) 45.50 45.50 45.50 138.0 138.0 138.0 240.B 0.A 120.C 30.00 30.00 30.00 3 -13.50 4 .00 5 13.50 Node No.Diam(in)Name No.Bundle Cond Dia(in) Insulators No.Len.(in) Series Wood (ft) 3 .563 .563 .563 1 .6PENGUIN PENGUIN PENGUIN 9 5.74 5.74 5.74 6.8 4 1 .6 9 6.8 5 1 .6 9 6.8 L FLASH *****Version 4.01MULTI r EPRI Lighting Outage Rate Calculation Program RP1284-3 &RP2151-1 IDAHO POWER,WOOD RIVER-KETCHUM 138KV TRANSMISSION LINETITLE: Echo of Input Data (Continued) 82TowerType Tower Height Number of Nodes... 58.50 (ft) 5 Data for the 5 Tower Elements: No.Node A Node B Length (ft)Diam(ft)Sparsity 6.89 14.44 6.89 45.28 45.28 .33 1131 .33 1212 .33 1234 .33 1345 .33 1455 Flashes to Tower Node Conductor at Node 3 3 4 3 5 4 Surge Footing Resistance Connected to Node 5 Footing R (ohms) Frequency of Occurrence 25.0 50.0 100.0 200.0 400.0 .1500 .4000 .3500 .0500 .0500 L r FLASH *****Version 4.01MULTI EPRI Lighting Outage Rate Calculation Program RP1284-3 &RP2151-1 IDAHO POWER,WOOD RIVER-KETCHUM 138KV TRANSMISSION LINETITLE: r Shielding Failure Flashover Rates NO SHIELDING FAILURES CALCULATED r Back Flashover Rates Backflashes %of Total per Year BackflashesNodesFlashing .122 .194 .109 .033 .004 .066 .005 22.89 36.33 20.53 6.10 3 5 3 5 4 .7254 12.41 1.02 4 35 4 3 Total =.53 SUMMARY FOR TOTAL LINE LENGTH 20.00 Thunder Days per Year 12.40 Line Length (Miles) 3.26 Strokes to Line per Year .00 Shielding Failures per Year .53 Back Flashovers per Year .53 Combined Flashovers per Year L Thunderstorm Days Thunderstorm Days v:T .i TB13J |g ?S S 2 B -.Oil g I s s s s S -?ODBiiisa M'l F"sfV •Jl— >^1»LNvW- O Z-m7 fi,(CMS Lor T Emm ®?lr S<5??CO IE i ; rr4K ! 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