Inquiry into the High Incidence of Power Outages for the City of - - PowerPoint PPT Presentation

Inquiry into the High Incidence

• f Power Outages

for the City of Yellowknife

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AGENDA

 Introductions  North of 60 electrical systems

 Yukon Electrical Ltd.  Northland Utilities (NWT) Ltd.  Northland Utilities (YK) Ltd.

 Reliability Indices Definitions

 SAIFI, SAIDI, CAIDI

 North of 60 Comparisons Reliability Indices  NUL Reliability Indices  Answers to PUB questions December 12, 2012  Summary

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INTRODUCTIONS

Duane Morgan, Manager Northland Utilities (Yellowknife) Limited

 38 years of service  All in the North

• 20 Years in the Yukon
• 18 Years in the NWT

 Extensive experience in the operations and

maintenance of northern power systems

 Will be doing the overview this morning

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INTRODUCTIONS

Kevin Lailey, Operations Superintendent Northland Utilities (Yellowknife) Limited

 23 years of service  Extensive experience in the operation of

distribution power systems and implementation of maintenance programs throughout Northland Utilities service area and ATCO Electric service areas

INTRODUCTIONS

Phil Borgel, Senior Engineer Yukon Electrical Limited Northland Utilities Limited

 22 years of service  Background in Developing Standards, design

work, and now providing Senior Engineering services to the Yukon, NWT and ATCO Electric

INTRODUCTIONS

Christina Chorostkowski, Engineering Assistant Northland Utilities (Yellowknife) Limited

 7 years of service  Provides design work and estimates for

customers wanting electrical services

 Does all NUL schematic drawings (MicroStation &

AutoCAD)

 Keeps the statistical records on system

performance

 Hydroelectric Grid  Multiple source

interconnected Grid

 Diesel backup

 Yukon Energy Corp.

 Breakers

 Auto Reclose

Yukon Electrical

Northland Utilities (NWT) Limited

 Taltson hydroelectric grid

 NTPC Operated

 Diesel backup

 NUL Operated

 Breakers

 Auto Reclose

Northland Utilities (Yellowknife) Ltd.

 Snare hydroelectric grid

 NTPC Operated

 Bluefish hydroelectric

grid

 NTPC Operated

 Diesel back up

 NTPC Operated

 Breakers

 Non Auto Reclose

RELIABILITY INDICIES

 SAIFI – System Average Interruption Frequency Index

 The average number of interruptions per customer

served

• FREQUENCY

 SAIDI – System Average Interruption Duration Index

 The system average interruption duration for customers

served

• HOURS WITHOUT SERVICE

 CAIDI – Customer Average Interruption Duration Index

 The average duration of a interruption, for customers who

have experienced interruptions

• RESTORATION TIME

NORTH OF 60 RELIABILITY INDICIES

Table 1.0

SAIFI SAIDI CAIDI

UNPLANNED PLANNED LOSS OF SUPPLY OVER ALL UNPLANNED PLANNED LOSS OF SUPPLY OVER ALL UNPLANNED PLANNED LOSS OF SUPPLY OVER ALL 2010

Yukon Electrical Ltd. 0.25 0.17 1.74 2.16 0.32 0.45 1.12 1.89 1.26 2.61 0.64 0.88 Northland Utilities (NWT) Ltd. 1.82 0.28 2.76 4.86 0.33 0.42 1.35 2.1 0.18 1.49 0.49 0.43 Northland Utilities (YK) Ltd. 1.09 0.12 8.89 10.1 0.48 0.35 5.73 6.56 0.44 2.97 0.64 0.65 CEA Rural Utilities 7.06 2.55 2.77

2011

Yukon Electrical Ltd. 0.88 0.28 3.2 4.36 0.75 0.72 3.85 5.32 0.85 2.56 1.2 1.22 Northland Utilities (NWT) Ltd. 0.12 0.2 11.59 11.91 0.12 0.56 3.83 4.51 0.99 2.8 0.33 0.38 Northland Utilities (YK) Ltd. 1.58 0.27 15.37 17.22 1.83 0.25 5.77 7.85 1.15 0.94 0.38 0.46 CEA Rural Utilities 7.53 2.98 2.53

2012

Yukon Electrical Ltd. 0.92 0.11 0.94 1.97 1.4 0.27 0.53 2.2 1.53 2.37 0.56 1.12 Northland Utilities (NWT) Ltd. 2.43 0.9 9.5 12.83 2.71 1.83 2.86 7.4 1.12 2.04 0.3 0.58 Northland Utilities (YK)

• Ltd. **

1.76 0.09 15.46 17.31 1.15 0.52 8.15 9.82 0.65 5.86 0.53 0.57 CEA Rural Utilities - NOT AVAILABLE AT THIS TIME

NUL – RELIABILITY INDICIES 2009/2010, 2010/2011 & 2011/2012

Table 2.0

Total Outag es SAIFI SAIDI CAIDI

UNPLANNED PLANNED LOSS OF SUPPLY OVERALL UNPLANNED PLANNED LOSS OF SUPPLY OVERALL UNPLANNED PLANNED LOSS OF SUPPLY OVERALL

2009/2010 57 0.27 0.05 9.40 9.72 0.30 0.22 3.72 4.24 1.13 4.11 0.40 0.44 2010/2011 100 2.22 0.13 13.07 15.42 1.82 0.22 7.88 9.92 0.82 1.71 0.60 0.64 2011/2012 118 ** 1.84 0.23 18.83 20.90 1.30 0.20 8.28 9.78 0.70 0.89 0.44 0.47 Average 78.50 1.44 0.14 13.77 15.35 1.14 0.21 6.63 7.98 0.88 2.24 0.48 0.52

** Feb 2012 helicopter crash not included

Northland Utilities (YK) Ltd. Top Four Causes

Table 3.0

Cause Number of Outage Events (Feb 2012 helicopter not included) Overall Cause Percentages

2009/2010 2010/2011 2011/2012

Unknown/Other 6 15 16 13% ** Outage Planned 12 25 29 25% ** Supply Lost 16 27 38 29% ** Tree Contact

• 1

0.4% Lightning 1

• 0.4%

Defective Equipment 9 5 7 8.0% Weather

• 1

0.4% Adverse Environment

• 2
• 7.0%

Human Element 1 2

• 1.0%

Foreign Interference 12 24 26 22% **

57 100 118 275 Total Outages During 2009/10, 2010/11, & 2011/12 Total Number of Power Outages

BIRD ON A WIRE

BIRD DETERANT

BIRD DETERANT

IS THERE AN INCREASE…?

…In the incidence of outages measured by number?

 There was an increase in the number of outages year to year

 2010 – 57 outages

41 not including loss of supply

 2011 – 100 outages

73 not including loss of supply

 2012 – 118 outages

80 not including loss of supply

(February 2012 helicopter crash not included)

…In the incidence of outages measured by impacted customers?

 There was an increase in the number of customers impacted year to year

 2010 – 77,508 customers

2,558 not including loss of supply

 2011 – 122,997 customers

18,743 not including loss of supply

 2012 – 166,645 customers

16,494 not including loss of supply

(February 2012 helicopter crash not included)

…In the incidence of outages measured by duration?

 There was a increase from year to years in the total duration

 2010 – 33,835 customer hours

4,155 not including loss of supply

 2011 – 79,136 customer hours

16,270 not including loss of supply

 2012 – 77,942 customer hours

11,934 not including loss of supply

(February 2012 helicopter crash not included)

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CORRECTIVE ACTIONS

Have an extensive list of actions in place already.

 Operations & Maintenance  System Improvements  Fuse Co-ordination Plan  Breaker to Breaker Protection

EXAMPLES

 25kV Conversion Project – Completed in 2012  Wildlife Protection Program – Completed by 2013  Monthly meetings with NTPC – Ongoing

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WHAT IS AN ACCEPTABLE LEVEL…?

Northland Utilities (YK) Ltd. will

continue to monitor the new 25kV distribution power system.

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HOW TO REPORT?

Industry Standards

SAIFI, SAIDI & CAIDI

Annual Reporting

Starting at NUL’s next GRA

Data/Results will be utilized to

influence O&M, and system improvements

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SUMMARY

Northland Utilities believes that with the recent upgrades on the supply side (Bluefish), as well as, the completion of the 25kV Conversion on September 21, 2012

 Positive effect on customers  Duration of outages will be lessened in future years.

In addition with on going maintenance programs, inspections and system improvements NUY would like to suggest we continue to monitor our respective systems and provide a full reliability report at the time of our next GRA.

 This would offer a true reflection of the Yellowknife

distribution system improvements put into service from the recent upgrades to our system (25kV Conversion).

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Thank you