International Trends in Asset and Maintenance Management through Enhanced Monitoring and Diagnostics of Electrical Facilities

Transcription

1 International Trends in Asset and Maintenance Management through Enhanced Monitoring and Diagnostics of Electrical Facilities Presented by Tony McGrail, Kenneth Elkinson Doble Engineering Company

2 Agenda Standards Risks and Risk Management Asset Populations Transformer Failures and Modes On-line monitoring planning action Discussion Questions

3 Doble Engineering Company Global Leader in T&D Engineering Services founded 1920 Transformer Diagnostics Circuit Breaker Diagnostics Protection Diagnostics Rotating Machinery Diagnostics Cable & Switchgear Diagnostics Doble Material Laboratories Doble Consulting & Testing Services Doble Client Services & Application Engineering Teams

4 What is Asset Management? One definition is The systematic and coordinated activities and practices through which an organization optimally and sustainably manages its assets and asset systems, their associated performance, risks and expenditures over their life cycles for the purpose of achieving its organizational strategic plan. PAS55-2:2008

5 Asset Management Systems CBM RCM TQM PAS 55 ISO55000 Standard

6 PAS55 History

7 ISO Structure/Timeline ISO 55000: Overview, Principles and Terminology A (critical) marketing document (why) ISO 55001: Requirements The shall statements (what) ISO 55002: Guidelines Explanations and examples (how)

8 ISO Definitions Asset something with potential value to an organization and for which the organization has a responsibility Asset System - group of assets that interact and/or are interrelated so as to deliver a required business function or service Asset = Asset System

9 Asset Life Asset life is defined as the period from its conception to end of life Assets often pass through identifiable asset life stages The description (and naming) of stages can differ for different assets and different applications/organizations An asset system, through the replacement, modification and/or maintenance of component assets, may even have an indefinite life

10 Asset Responsibility Period

11 Addressing Risk Monitoring Maintenance Asset Replacement aged assets Emergency Planning Whole of life considerations

12 Risk Signatures Failure history based Time based Model based Reactive Condition based Contingency based Buckland

13 Risk response strategies evolved Buckland

14 Why is the condition of critical equipment important? OBJECTIVES: Identify Condition Status - Good & Bad Life Extension Maximize Asset value Minimize Outages Safe & Productive Operation Insurance Compliance Industry Compliance Informed Decisions 14

15 Quantity Cumulative % Substation Transformers Age Profile Some old units doesn t say much about risk 40 Substation Operating Transformers Age Profile National Grid - EDO 100% DxD 80% 25 60% Units without age data 26.83% TxD 40% 20% Year 0% Doesn t really help prioritize action

16 Failures Many older transformers still in service As they age, expected that their reliability will fail End of Life element of bathtub curve has not arrived yet Managing these transformers requires understanding the issues, analyzing data, and subsequent action

17 Failure Modes Strikes per square mile Sub #15 : A squirrel contacted the bushing terminals on the 1 Transformer, destroying the bushing and blowing A and B phase fuses. 17

18 Failure Modes

19 Failure Modes

20 Failures

21 Failures

22 Failures

23 Failures

24 Failure Causes Transformers From Analysis of Transformer Failures William Bartley, HSB, presented at Doble Client Conference, Boston,

25 Data and Analysis Condition data is collected as part of iterative process to identify actions Collect Data Analyze Data Identify Anomaly Diagnose Anomalous Data Identify Prognosis for Anomalous Data Plan for Intervention Monitor the Situation Iterate Identify Risk

26 Planning 26

27 Survey: Infra Red action?

28 Data and Analysis Consequence of failure to plan intervention effectively

29 Why Condition Monitoring? CM has always been used, but in different forms. Example: Station staff or maintenance crews would regularly record readings, any change would cause them to raise the issue with the engineer and then to central expertise where it would be managed There used to be a large workforce and a depth of knowledge with limited computer power Now there are powerful computers and a smaller workforce with a reduced depth of knowledge

30 Monitoring Available Bushing & Oil Insulation Quality Dissolved Gases Partial Discharge

31 Why Monitor Bushings?

32 Always too much to do IEEE Industrial Applications Volume 18, Issue 3, 2012 Multitasking and the Illusion of Safety: The Potential Impact in Certain Electrical Hazard Scenarios What are people concentrating on?

33 LTC DGA Planning Intervention

34 DGA Planning Intervention JTL

35 Case 1: Bushing PF A Doble Client was monitoring the high and low voltage bushings of a GE 345/120kV, 370MVA autotransformer with an online PF monitoring device. Among the bushings monitored was H1: GE Type U 345 KV system voltage 220 KV bushing rating 800 Amp Manufactured 1986

36 Case 1: Bushing PF On July 10, 2008, at 4:00 AM, an alert alarm was issued, pertaining to H3. The monthly PF limit had been exceeded.

37 Case 1: Bushing PF

38 Permanent Online Monitoring of PD Computer(s) for Remote Control & Analysis UHF Plate Sensors (Mounted in Hatch) LAN / WAN / Internet LDC-7/UHF PD Monitoring Server Software UHF Drain Valve Sensors Ethernet Hub Fiberoptic LAN PD-Guard/UHF PD-Guard cabinet 38

39 Case 2: PD Points of Interest: - High amplitude -Compared to baseline - High frequency -Too high to be corona Corona Transformer with potential PD RF emission from 50 to 500 MHz 39

40 Case study 2 4 transformers same utility in different cities- 3 phase 110/225 kv City 1 The measurements on both valves showed PD activity from inside the transformer. Left drain valves Right drain valves In city 2, city 3 and city 4. No critical PD levels above the detection sensitivity have been measured 40

41 H 2 concentration / ppm Current / A Case Study 2 -Online PD Monitoring UHF and H 2 Mp U V W Stufenschalter Hydran UHF Sensor 8 12 am 12 8 pm Different UHF PD Pattern correlating to increasing gas content (state of research) 41

42 Case Study 3 - DGA kv, 31.5 MVA Transformer Energized Dec 2008 Regularly scheduled DGA sample taken October 2009

43 Case Study 4 - DGA What is expected?

44 Ageing transformers CIGRE, April 2012

45 Analytics Protecting & Extending Asset Life A host of analytics roll up to asset alerts (condition, capacity, risk) Looking for low-frequency events that have high impact to the business Auto-generation of asset watch lists, based on analytical scoring of assets 45

46 Conditional Events High Level to Detail Views Asset View Substation View Component View Regional View 4 6

47 Earthquake L Aquila, Italy 2009 Series of small earthquakes March 31 st : experts tell residents things were OK April 6 th : big event 200 died;17,000 homeless Experts put on trial for manslaughter

48 Conclusions Online monitoring presents challenges, but great value All the monitoring creates vast amount of data Have a plan in place to handle the data, as well as what the data tells you Great opportunity to realize a truly smart grid 48

49 Presentation Over Thank you!!!