Toronto Hydro-Electric System Limited 2010 Asset Condition Assessment Audit

136 Pages·2010·1.67 MB·English

Toronto Hydro-Electric System Limited
2010 Asset Condition Assessment Audit

Kinectrics Inc. Report No: K-015466-RA-0001-R01

July 23, 2010

Confidential & Proprietary Information
Contents of this report shall not be disclosed
without authority of client.
Kinectrics Inc.
800 Kipling Avenue
Toronto, ON
M8Z 6C4 Canada
www.kinectrics.com
Toronto Hydro-Electric System Limited
2010 Asset Condition Assessment Audit

DISCLAIMER

Kinectrics Inc. has prepared this report in accordance with, and subject to, the terms and
conditions of the agreement between Kinectrics Inc. and Toronto Hydro-Electric System
Limited

@Kinectrics Inc., 2010.
ii K-015466-RA-0001-R01
Toronto Hydro-Electric System Limited
2010 Asset Condition Assessment Audit

Toronto Hydro-Electric System Limited
2010 Asset Condition Assessment Audit

Kinectrics Inc. Report No: K-015466-RA-0001-R01

July 23, 2010

Prepared by:

_______________________________________
Katrina Lotho
Engineer
Distribution and Asset Management Department

_______________________________________
Fan Wang
Engineer
Distribution and Asset Management Department

Reviewed by:

_______________________________________
Yury Tsimberg
Director – Asset Management
Transmission and Distribution Technologies

Approved by:

________________________________________
Mr. Shahrokh Zangeneh
General Manager
Transmission and Distribution Technologies Business

Dated: __________________________________

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Toronto Hydro-Electric System Limited
2010 Asset Condition Assessment Audit

To: Thor Hjartarson
Toronto Hydro-Electric System Limited
500 Commissioners Street
Toronto, Ontario
M4M 3N7

Revision History

Revision Date Comments Approved
Number
R00 July 15, 2010 First Draft n/a
R01 July 23, 2010 Final Draft Shahrokh Zangeneh

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Toronto Hydro-Electric System Limited
2010 Asset Condition Assessment Audit

Table of Contents

Table of Contents .............................................................................................................. v
1 Executive Summary .................................................................................................. 1
1.1 Background ....................................................................................................... 1
1.2 Key Achievements between 2009 and 2010 ..................................................... 1
1.3 Comparison of 2009 and 2010 ACA Methodology ............................................ 2
1.4 Audit Results ..................................................................................................... 3
1.4.1 Changes in Health Index Formulation ........................................................... 3
1.4.2 Changes in Asset Category Granularity ........................................................ 4
1.4.3 Changes in Population and Sample Size ...................................................... 4
1.4.4 Changes in Health Index Distribution ............................................................ 9
1.5 Conclusions ..................................................................................................... 12
1.6 Assessment of 2009 Report Recommendations ............................................. 13
1.7 Recommendations Going Forward .................................................................. 15
2 Station Power Transformers .................................................................................... 17
2.1 Changes in Health Index Formulation ............................................................. 17
2.2 Changes in Granularity .................................................................................... 17
2.3 Changes in Sample Size ................................................................................. 17
2.4 Changes in Health Index Classification ........................................................... 18
2.5 Recommended Health Index Formulation ....................................................... 19
2.5.1 Condition and Sub-Condition Parameters ................................................... 19
2.5.2 Condition Criteria ......................................................................................... 20
3 Station Switchgear .................................................................................................. 25
3.1 Changes in Health Index Formulation ............................................................. 25
3.2 Changes in Granularity .................................................................................... 25
3.3 Changes in Sample Size ................................................................................. 25
3.4 Changes in Health Index Classification ........................................................... 26
3.5 Recommended Health Index Formulation ....................................................... 27
3.5.1 Condition and Sub-Condition Parameters ................................................... 27
3.5.2 Condition Criteria ......................................................................................... 28
4 Air Blast Circuit Breakers ........................................................................................ 31
4.1 Changes in Health Index Formulation ............................................................. 31
4.2 Changes in Granularity .................................................................................... 31
4.3 Changes in Sample Size ................................................................................. 31
4.4 Changes in Health Index Classification ........................................................... 32
4.5 Recommended Health Index Formulation ....................................................... 33
4.5.1 Condition and Sub-Condition Parameters ................................................... 33
4.5.2 Condition Criteria ......................................................................................... 35
5 Air Magnetic Circuit Breakers .................................................................................. 41
5.1 Changes in Health Index Formulation ............................................................. 41
5.2 Changes in Granularity .................................................................................... 41
5.3 Changes in Sample Size ................................................................................. 41
5.4 Changes in Health Index Classification ........................................................... 42
5.5 Recommended Health Index Formulation ....................................................... 42
6 Oil Circuit Breakers ................................................................................................. 43
6.1 Changes in Health Index Formulation ............................................................. 43
6.2 Changes in Granularity .................................................................................... 43
6.3 Changes in Sample Size ................................................................................. 43
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2010 Asset Condition Assessment Audit

6.4 Changes in Health Index Classification ........................................................... 44
6.5 Recommended Health Index Formulation ....................................................... 44
7 Oil KSO Circuit Breakers ......................................................................................... 45
7.1 Changes in Health Index Formulation ............................................................. 45
7.2 Changes in Granularity .................................................................................... 45
7.3 Changes in Sample Size ................................................................................. 45
7.4 Changes in Health Index Classification ........................................................... 46
7.5 Recommended Health Index Formulation ....................................................... 46
8 SF6 Circuit Breaker ................................................................................................. 47
8.1 Changes in Health Index Formulation ............................................................. 47
8.2 Changes in Granularity .................................................................................... 47
8.3 Changes in Sample Size ................................................................................. 47
8.4 Changes in Health Index Classification ........................................................... 48
8.5 Recommended Health Index Formulation ....................................................... 48
9 Vacuum Circuit Breakers ........................................................................................ 49
9.1 Changes in Health Index Formulation ............................................................. 49
9.2 Changes in Granularity .................................................................................... 49
9.3 Changes in Sample Size ................................................................................. 49
9.4 Changes in Health Index Classification ........................................................... 50
9.5 Recommended Health Index Formulation ....................................................... 50
10 Network Transformers ............................................................................................. 51
10.1 Changes in Health Index Formulation ............................................................. 51
10.2 Changes in Granularity .................................................................................... 51
10.3 Changes in Sample Size ................................................................................. 51
10.4 Changes in Health Index Classification ........................................................... 52
10.5 Recommended Health Index Formulation ....................................................... 53
10.5.1 Condition and Sub-Condition Parameters ............................................... 54
10.5.2 Condition Criteria ..................................................................................... 56
11 Submersible Transformers ...................................................................................... 59
11.1 Changes in Health Index Formulation ............................................................. 59
11.2 Changes in Granularity .................................................................................... 59
11.3 Changes in Sample Size ................................................................................. 59
11.4 Changes in Health Index Classification ........................................................... 60
11.5 Recommended Health Index Formulation ....................................................... 61
11.5.1 Condition and Sub-Condition Parameters ............................................... 61
11.5.2 Condition Criteria ..................................................................................... 62
12 Vault Transformers .................................................................................................. 65
12.1 Changes in Health Index Formulation ............................................................. 65
12.2 Changes in Granularity .................................................................................... 65
12.3 Changes in Sample Size ................................................................................. 65
12.4 Changes in Health Index Classification ........................................................... 66
12.5 Recommended Health Index Formulation ....................................................... 67
12.5.1 Condition and Sub-Condition Parameters ............................................... 67
12.5.2 Condition Criteria ..................................................................................... 68
13 Padmounted Transformers ..................................................................................... 71
13.1 Changes in Health Index Formulation ............................................................. 71
13.2 Changes in Granularity .................................................................................... 71
13.3 Changes in Sample Size ................................................................................. 71
13.4 Changes in Health Index Classification ........................................................... 72
13.5 Recommended Health Index Formulation ....................................................... 73
13.5.1 Condition and Sub-Condition Parameters ............................................... 73
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2010 Asset Condition Assessment Audit

13.5.2 Condition Criteria ..................................................................................... 74
14 Automatic Transfer Switches................................................................................... 77
14.1 Changes in Health Index Formulation ............................................................. 77
14.2 Changes in Granularity .................................................................................... 77
14.3 Changes in Sample Size ................................................................................. 77
14.4 Changes in Health Index Classification ........................................................... 78
14.5 Recommended Health Index Formulation ....................................................... 79
14.5.1 Condition and Sub-Condition Parameters ............................................... 79
14.5.2 Condition Criteria ..................................................................................... 80
15 Cable Chambers ..................................................................................................... 83
15.1 Changes in Health Index Formulation ............................................................. 83
15.2 Changes in Granularity .................................................................................... 83
15.3 Changes in Sample Size ................................................................................. 83
15.4 Changes in Health Index Classification ........................................................... 84
15.5 Recommended Health Index Formulation ....................................................... 85
15.5.1 Condition and Sub-Condition Parameters ............................................... 85
15.5.2 Condition and Criteria .............................................................................. 86
16 Wood Poles ............................................................................................................. 89
16.1 Changes in Health Index Formulation ............................................................. 89
16.2 Changes in Granularity .................................................................................... 89
16.3 Changes in Sample Size ................................................................................. 89
16.4 Changes in Health Index Classification ........................................................... 90
16.5 Recommended Health Index Formulation ....................................................... 91
16.5.1 Condition and Sub-Condition Parameters ............................................... 91
16.5.2 Condition Criteria ..................................................................................... 92
17 Three Phase Overhead Gang (Rem.) Switches ...................................................... 95
17.1 Changes in Health Index Formulation ............................................................. 95
17.2 Changes in Granularity .................................................................................... 95
17.3 Changes in Sample Size ................................................................................. 95
17.4 Changes in Health Index Classification ........................................................... 96
17.5 Recommended Health Index Formulation ....................................................... 97
17.5.1 Condition and Sub-Condition Parameters ............................................... 97
17.5.2 Condition Criteria ..................................................................................... 98
18 Three Phase Overhead Gang (Man.) Switches .................................................... 101
18.1 Changes in Health Index Formulation ........................................................... 101
18.2 Changes in Granularity .................................................................................. 101
18.3 Changes in Sample Size ............................................................................... 101
18.4 Changes in Health Index Classification ......................................................... 102
18.5 Recommended Health Index Formulation ..................................................... 102
19 SCADAMATE Switches ........................................................................................ 103
19.1 Changes in Health Index Formulation ........................................................... 103
19.2 Changes in Granularity .................................................................................. 103
19.3 Changes in Sample Size ............................................................................... 103
19.4 Changes in Health Index Classification ......................................................... 104
19.5 Recommended Health Index Formulation ..................................................... 104
20 Padmounted Switches .......................................................................................... 105
20.1 Changes in Health Index Formulation ........................................................... 105
20.2 Changes in Granularity .................................................................................. 105
20.3 Changes in Sample Size ............................................................................... 105
20.4 Changes in Health Index Classification ......................................................... 106
20.5 Recommended Health Index Formulation ..................................................... 107
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2010 Asset Condition Assessment Audit

20.5.1 Condition and Sub-Condition Parameters ............................................. 107
20.5.2 Condition Criteria ................................................................................... 108
21 Network Vaults ...................................................................................................... 111
21.1 Changes in Health Index Formulation ........................................................... 111
21.2 Changes in Granularity .................................................................................. 111
21.3 Changes in Sample Size ............................................................................... 111
21.4 Changes in Health Index Classification ......................................................... 112
21.5 Recommended Health Index Formulation ..................................................... 113
21.5.1 Condition and Sub-Condition Parameters ............................................. 114
21.5.2 Condition Criteria ................................................................................... 115
22 Underground Cables ............................................................................................. 117
22.1 Changes in Health Index Formulation ........................................................... 117
22.2 Changes in Granularity .................................................................................. 117
22.3 Changes in Health Index Classification ......................................................... 117
22.4 Recommended Health Index Formulation ..................................................... 118
22.4.1 Condition and Sub-Condition Parameters ............................................. 118
22.4.2 Condition Criteria ................................................................................... 120
23 Glossary of Terms ................................................................................................. 123
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Toronto Hydro-Electric System Limited 1 - Executive Summary
2010 Asset Condition Assessment Audit
1 Executive Summary

1.1 Background

Over the past number of years, Toronto Hydro-Electric System Limited (THESL) has
been putting forth considerable efforts to improve its Asset Management Program. In
2006, a full Asset Condition Assessment (ACA) for key distribution assets was
conducted by Kinectrics Incorporated (Kinectrics). Between 2006 and 2009, THESL
took steps to adopt the recommendations prescribed by the 2006 ACA and to improve
the quality of its asset condition data. Further, THESL developed the Health Index
Calculator, an application that evaluates the Health Indices of assets based on current
and best available inspection data. In 2009, using this Calculator, an ACA was again
conducted by THESL. Kinectrics was then enlisted to audit the progress that THESL had
made between 2006 and 2009, and to compare the results of the 2006 and 2009 ACA.
Over the past year, THESL has again put forth effort to improve and to adopt the
recommendations of the 2009 Audit. Kinectrics has been asked to assess the changes
and ACA results between 2009 and 2010. This report describes the Kinectrics findings.

1.2 Key Achievements between 2009 and 2010

The key achievements between 2009 and 2010 are highlighted below:

• Considerable efforts were made to increase the percentage of assets with
sufficient information for condition assessment.

• By assigning newly installed assets a “very good” Health Index categorization,
new assets are now being included in the Asset Condition Assessment process.
This is a significant improvement as it increases the number of assets with
known condition. Prior to this, because of inspection cycles, new assets were
often found with insufficient data for condition assessment. With this new
procedure in place, the start of the Health Index calculation process is now
dependent on both maintenance inspections cycles and installation date.

• Age remains an important parameter for many assets, particularly for those that
are run to failure. As such, a process to verify age has been put into place.
Where age information is missing, nameplate verification is being made a
requirement during inspections.

• More data has been migrated into the Asset Registry (Ellipse). This includes
Wood Pole and Underground Cable data. Having this additional information has
allowed Wood Poles condition results to be incorporated into the Calculator. It
will also facilitate the process of adding Underground Cables condition results
into the Calculator.

• More refined formulas are being considered to derive Health Index formulation.
Dominant factors that cause end-of-life conditions, regardless of other condition
parameters, are being identified and factored into improved Health Index
formulations.
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Toronto Hydro-Electric System Limited 1 - Executive Summary
2010 Asset Condition Assessment Audit

• Focused assessment for particular sub-systems of the distribution system has
begun. For Network Assets, Kinectrics performed an Asset Condition
Assessment using its own stand alone tool and issued a separate report
describing the findings. The assessment used improved Health Index
formulation, newly collected end-of-life condition data, and dominant factors for
Network Vaults.

• Between 2009 and 2010, significant improvements have been made with respect to
the Calculator itself and business rules regarding inspection data management.

The old version of the Calculator was based on a Microsoft Access platform, as it
was the only available application capable of supporting the data requirements
associated with the Asset Condition Assessment. The Calculator was programmed to
use the best available inspection data.

In 2010, THESL made the decision to transition the Calculator from Microsoft
Access to a web-based, Business Intelligence (BI) platform. This was to enable
the following: improved accessibility and visibility across the organization, greater
data management capabilities and enhanced analytics and reporting tools.
Through the BI platform, other corporate systems and information sources can
also be integrated and consolidated into the Calculator. This feature is critical for
supporting future developments of Health Index formulations, condition
parameters and weights. Accordingly, as internal efforts were made to improve
data availability and reconcile data quality, new business rules were adopted
such that the Calculator only uses the latest inspection data.

1.3 Comparison of 2009 and 2010 ACA Methodology

Health Index (HI) formulation and results from 2009 and 2010 were compared for the
following twenty one (21) Asset Categories:

• Stations Power Transformers
• Station Switchgear
• Air Blast Circuit Breaker
• Air Magnetic Circuit Breaker
• Oil Circuit Breaker
• Oil KSO Circuit Breaker
• SF6 Circuit Breaker
• Vacuum Circuit Breaker
• Network Transformers
• Submersible Transformers
• Vault Transformers
• Padmounted Transformers
• ATS
• Cable Chambers
• Wood Poles
• Phase Overhead Gang (Rem.) Switches
• Phase Overhead Gang (Man.) Switches
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