Resource Asset Management Solutions, LLC
401 Academy St – Cambridge, MD 21613 – (844) RAMSLLC
Sample Reliability Analysis
Summary:
Sample feeder has been assessed for condition issues and analyzed for overall reliability risks. According to outage data from
January 1, 2010 and December 31, 2012, there were 201 outage events that occurred across the entirety of the feeder. There
are three primary causes that have been identified, 1) Tree related events, 2) Equipment Failure, and 3) Lightning Damage.
Support Data:
1)
Outage Event Compilation
a. 201 Outage Events
i. 70 Tree Related Events
ii. 55 Equipment Failure Events
iii. 25 Lightning Events
iv. 20 Animal Related Events
v. 15 Wind Events
vi. 16 Miscellaneous Events
b. 2,638,089 Customer Outage Minutes on Backbone
c. 2,121,972 Customer Outage Minutes off Backbone
2)
Contractor GRC Assessment Compilation
a. 400 Total Deficiencies
i. 34 P2 Deficiencies
ii. 259 P3 Deficiencies
iii. 107 P4 Deficiencies
3)
Recloser/Sectionalization Data
a. 2 Reclosers in Use (Noted as Green Flags on Outages with Reclosers Map)
i. 39065/29287
1. 2 Poles S of 7277 Augustine Herman Hwy (Hwy 313)
a. 5.5 miles from Massey Substation
b. 24 Outage Events above Recloser (Breaker Zone)
ii. 39560/31125
1. 201 Augustine Herman Hwy (Hwy 313)
a. 8.05 miles from Massey Substation, 2.55 miles from previous recloser
b. 12 Outage Events between Reclosers (Recloser Zone)
b. 2 Unfused Laterals (Noted as Yellow Pins on Unfused Laterals Map)
i. 39184/28903
1. 2 Poles N of 145 N Main St. (Galena)
ii. 39230/33228
1. 102 Parkside Dr. (Earleville)
Field Assessment of Outage Factors:
In a direct correlation between the two datasets we find that the following is true:
1)
Tree Related Outage Events
a. 37 of the 70 tree related outage events occurred on the backbone.
b. 3 remaining potential vegetation hazards on the poles with prior outage events.
c. 6 of the related poles sit in intermediate vegetation coverage areas.
2)
Equipment Related Outage Events
a. 23 of the 55 equipment failure related outage events occurred on the backbone.
b. 8 poles that are situated in the breaker risk zone and 10 poles in the recloser risk zone.
c. 9 transformers with uninsulated lead wires, 3 of which were newly replaced.
d. 9 of the poles that are missing equipment animal guards.
e. 1 previously replaced fuse that is currently blown.
Resource Asset Management Solutions, LLC
401 Academy St – Cambridge, MD 21613 – (844) RAMSLLC
3)
Lightning Related Outage Events
a. 6 of the 25 lightning related outage events occurred on the backbone.
b. Only one of the related poles has line arresters present, and two additional poles have equipment
arresters protecting transformers.
c. 2 poles were found to have contaminated insulators.
d. 3 poles are in open environmental areas.
e. 3 poles were found to have BIL value ratings below 300kVa.
4)
Animal Related Outage Events
a. 7 of the 20 animal related outage events occurred on the backbone.
b. 2 poles are in the breaker risk zone, and 2 poles in the recloser risk zone.
c. 2 of the poles are missing equipment animal guards.
d. Contaminated insulators were found on poles with previous bird related outages.
5)
Wind Related Outage Events
a. 5 of the 15 wind related outage events occurred on the backbone.
b. 3 of the poles are in the breaker risk zone.
c. 2 of the related poles are found in intermediate vegetation coverage areas, one of which has current
potential for vegetation hazards both at the pole and in its mid-span.
Identified Outage Causes and Recommendations:
1)
Sectionalization
a. Priority 2 – If possible, install additional Recloser at mid-point of current Breaker Zone
i. Reduces potential outages in Breaker Zone
1. Eliminates 641,500 prior customer outage minutes from Breaker Zone (24.3% of prior
minutes)
ii. Noted as Red Flag on Recloser Installation Map
2)
Tree Related Outages
a. Priority 4 - Evaluate the potential for implementing increased clearances in Intermediate and Sheltered
environment “wind zones” to reduce potential tree limb hazards when possible within current cycle work.
i. Noted as Yellow Arrow on Wind/Fall Zone Map
b. Priority 3 - Evaluate the feasibility of implementing increased clearances to include near hazards or “fall
zones” to reduce potential “fall through” hazards where possible.
i. Noted as Red Pins on Wind/Fall Zone Map
3)
Equipment Failure Related Outages
a. Priority 4 – Evaluate the potential for installing insulated leads on all major pole-top equipment during
planned capital work.
i. Currently there are 15 devices found in the field with uninsulated leads.
ii. Transformers, Reclosers, Capacitors, Regulators, etc.
iii. Noted as Red “X” on Uninsulated Leads Map
b. Priority 4 – When feasible to perform with planned capital work, Install animal guard protection to insure
proper insulation of pole-top equipment.
i. Primary Bushings, Underground Terminations
ii. Noted as Blue Dots on Animal Guards Map
4)
Lightning Related Outages
a. Priority 4 - Increase line arrester usage to include a minimum of 4 sets/line mile where possible, and on
taps/laterals to insure proper surge suppression.
i. Currently, there is a 2.04 mile stretch that has been found without any line arresters between the
Bohemia River and south of Mill Ln in Earleville.
ii. Existing locations noted as Yellow Squares on Line Arrester Map
b. Priority 4 - Consider Replacement of damaged or contaminated conductor insulators during planned capital
projects to reduce potential of “flash over” during lightning events.
i. Noted as Blue Stars on Damaged Insulators Map
Resource Asset Management Solutions, LLC
401 Academy St – Cambridge, MD 21613 – (844) RAMSLLC
c.
Priority 4 – Evaluate the possibility of increasing current BIL value ratings to a minimum of 300kV/pole,
during planned capital projects, to insure proper clearance from ground sources.
i. 71 Poles with values below recommended value of 300kVa
ii. Noted as Purple Triangles on BIL Values Map
5)
Animal Related Outages
a. Priority 4 – Evaluate the potential for installing insulated leads on all major pole-top equipment during
planned capital work.
i. Currently there are 15 devices found in the field with uninsulated leads.
ii. Transformers, Reclosers, Capacitors, Regulators, etc.
iii. Noted as Red “X” on Uninsulated Leads Map
b. Priority 4 – When feasible to perform with planned capital work, Install animal guard protection to insure
proper insulation of pole-top equipment.
i. Primary Bushings, Underground Terminations
ii. Noted as Blue Dots on Animal Guards Map
6)
Wind Related Outages
a. Priority 4 - Evaluate the potential for implementing increased clearances in Intermediate and Sheltered
environment “wind zones” to reduce potential tree limb hazards when possible within current cycle work.
i. Noted as Yellow Arrow on Wind/Fall Zone Map
b. Priority 3 - Evaluate the feasibility of implementing increased clearances to include near hazards or “fall
zones” to reduce potential “fall through” hazards where possible.
i. Noted as Red Pins on Wind/Fall Zone Map
Resource Asset Management Solutions, LLC
401 Academy St – Cambridge, MD 21613 – (844) RAMSLLC
3917928717 – Uninsulated Leads, Missing Animal Guards, Contaminated Insulators, BIL value < 300 kV
3935828738 – Uninsulated Leads, Missing Animal Guards
Resource Asset Management Solutions, LLC
401 Academy St – Cambridge, MD 21613 – (844) RAMSLLC
3848828795 – Wind Zone, Fall Zone, Multiple Splices
3887929757 – Wind Zone, Fall Zone, Prior Outage (Broken Cut-out – 166 Customer Minutes), Blown Fuse
Resource Asset Management Solutions, LLC
401 Academy St – Cambridge, MD 21613 – (844) RAMSLLC
3906529827 – Prior Outage (Trees - 207,852 Customer Minutes), Wind Zone, Fall Zone
3920828719 – Prior Outage (Broken XARM – 56,112 Customer Minutes), Damaged/Flashed Insulators, BIL value
< 300 kV
Resource Asset Management Solutions, LLC
401 Academy St – Cambridge, MD 21613 – (844) RAMSLLC
3918428903 – Unfused Lateral
Resource Asset Management Solutions, LLC
401 Academy St – Cambridge, MD 21613 – (844) RAMSLLC
3923033228 – Unfused Laterals, Decayed XARM, BIL Value < 300 kV