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Pilot Program on the Application of Electronic Resettable Sectionalizers to Improve Reliability

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Pilot Program on the Application of Electronic Resettable Sectionalizers to Improve Reliability SWEDE Conference May 1, 2008 Van Nguyen [email protected] Pilot Program Review. Circuit History on Hockley (HK) -04 and -06 Circuit Demographics Reliability Performance

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slide1
Pilot Program on the Application of Electronic Resettable Sectionalizers to Improve Reliability

SWEDE Conference

May 1, 2008

Van Nguyen

[email protected]

pilot program review
Pilot Program Review
  • Circuit History on Hockley (HK) -04 and -06
    • Circuit Demographics
    • Reliability Performance
  • Root Cause Analysis on Circuit Operations and Fuse Outages
    • Review of Outage Data in Early 2005
    • Potential Solutions
  • Course of Action for Electronic Resettable Sectionalizers (ERS )
    • Functions
    • Advantages
    • Safety Concerns
    • Implemented by Early 2006
    • Education
  • Performance Results for 2006 and 2007
circuit history
Circuit History
  • Circuit Demographics on HK-04 and HK-06
    • 12 kV circuits
    • Rural, agricultural areas
    • No static construction
    • Low customer count
      • HK-04 – 1,000 customers
      • HK-06 – 465 customers
circuit history con t
Circuit History (con’t)
  • Reliability Performance on HK-04
    • 10% SAIDI circuit in 2003, 2004 and 2005
    • Excessive circuit operations in 2004
    • 9 specific fuses accounted for 60% of total circuit SAIDI minutes from potential temporary events (lightning, wind, wildlife, etc…) in 2004
    • Similar performance in 2003 and 2005
circuit history con t1
Circuit History (con’t)
  • Reliability Performance on HK-06
    • 10% SAIDI circuit in 2004 and 2005
    • Excessive circuit operations in 2004
    • 5 specific fuses accounted for 58% of total circuit SAIDI minutes from potential temporary events in 2004
root cause analysis
Root Cause Analysis
  • Review of Outage Data in Early 2005
    • 60% (HK-04) and 58% (HK-06) of total circuit SAIDI mins from potential temporary events in 2004
    • Excessive circuit operations in 2004
      • HK-04 – 27 operations
      • HK-06 – 36 operations
    • Source of excessive operations unknown
    • Fault current data ( < 1kA to > 4kA ) from relays indicated activities may be at multiple points
root cause analysis con t
Root Cause Analysis (con’t)
  • Review of Outage Data in Early 2005
    • Lightning analysis investigation
      • No static construction
      • Flat, grasslands, agricultural areas
      • Temporary events such as lightning and wind
      • Erratic fault current values
      • Correlation between outages and lightning strikes
root cause analysis con t1
Root Cause Analysis (con’t)
  • Investigation of Potential Solutions
    • Installation of lightning arresters
      • Effective but costly
    • Installation of static neutral
      • Effective but costly
    • Remote controlled equipment
      • Limited effectiveness
    • Electronic resettable sectionalizers (ERS)
      • Effective and economical
course of action
Course of Action
  • Functions of ERS Devices
    • Works in conjunction with upstream reclosing protective device
    • Similar in operation as a typical sectionalizer
      • Registers current greater than its actuating level
      • Registers loss of voltage
      • Device opens on predetermined number of counts of fault current AND loss of voltage
    • 1, 2 and 3-count devices can be placed in series
course of action con t
Course of Action (con’t)
  • Advantages of ERS Devices
    • Allow temporary faults to clear without experiencing a sustained interruption
    • Less expensive alternative to reclosers to isolate faulted (sustained) sections of conductor
    • Fits into standard fuse cutout body
    • Simple to install and implement
    • Ideal for replacing existing fuses
course of action con t1
Course of Action (con’t)
  • Safety Concerns on ERS Devices
    • Must be used in conjunction with an upstream reclosing protective device
    • Cannot be blindly used to replace fuses
    • Detailed engineering analysis must be performed prior to implementing
    • Lack of familiarity by line crews on the operation of ERS devices
course of action con t2
Course of Action (con’t)
  • Implemented by Early 2006
    • Protection analysis conducted by engineering
    • Breaker coordination with hydraulic reclosers
    • HK-04
      • 3 hydraulic reclosers installed
      • 9 fuses replaced with ERS devices
    • HK-06
      • 1 hydraulic recloser installed
      • 5 fuses replaced with ERS devices
course of action con t3
Course of Action (con’t)
  • Education
    • Line crews trained on application
    • Article published in company-wide newsletter
    • Stenciling nomenclature (###N or N###)
performance results for 2006
Performance Results for 2006
  • HK-04 and HK-06
    • 47% combined decrease in SAIDI values
    • Neither repeated as 10% SAIDI circuits
  • Pilot program deemed successful
  • CPE approved the deployment of ERS devices on other circuits
performance results for 2007
Performance Results for 2007
  • HK-06 was not a 2007 10% SAIDI circuit
  • HK-04 was a 2007 10% SAIDI circuit
    • 16% of total circuit SAIDI mins from potential temporary events behind line fuses
    • Trees, collisions, material failures and unknown causes also contributed to SAIDI mins
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