The J & P Transformer Book A Practical Technology of the Power Transformer
Transformer Technology Seminar · Transformer Technology Seminar ... devices) §Increase in ......
Transcript of Transformer Technology Seminar · Transformer Technology Seminar ... devices) §Increase in ......
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Transformer Technology SeminarModular approach on economic condition assessment for power transformer;data management, “Fleet screening” and risk ranking
Pomona, CA May 24 – 25, 2016
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Current situation and tasks
Modular approach
Level 1: Basic
Level 2: Advanced
Level 3: HV testing
Data handling and data management
TLM™ Condition Assessment and On-site DiagnosticsContent
Outcome
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TLM™ Condition Assessment and On-site DiagnosticsCurrent situation
TLM™ Condition Assessment and On-site DiagnosticsCurrent situation
The ageing of oil and cellulose are strongly related
Moisture Oxygen Temperature
Oil / Cellulose - Insulation
Chemical decompositionAcids, Peroxides,add. water, oxygen
Accelerated Aging
Mechanical Degradation Dielectric Degradation
Lightning- and SwitchingImpulses Insulation Failure Short Circuits
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TLM™ Condition Assessment and On-site DiagnosticsCurrent situation
Unplanned failure of a large GSU
§ Forced outage, i.e. NPP loosing~$1.5 million per 24h
§ Replacement with a spare unit ifavailable: downtime minimum 2weeks
§ Risk of personal injury,environmental damage
§ Image-, company value-, stock-market quotation- depreciation
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• Average age of transformers >30 years
• Lead time of new transformers >1 year
• Increasing utilization
• Demand for modernization
• Demand for relocation
TLM™ Condition Assessment and On-site DiagnosticsCurrent situation
Market Condition
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§ Identify condition of installed transformer fleet
§ Prioritize based on Risk ranking of transformer
fleet
§ Maintenance recommendations
§ Reduction of unplanned outages
§ Intelligent spending of limited financial resources
§ Avoidance of damaging company’s image
§ Support strategic procurement of new units
Economic demands – Why?
TLM™ Condition Assessment and On-site DiagnosticsCurrent situation
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TLM™ Condition Assessment and On-site DiagnosticsThe Three Level Approach
Level 1:
Level 2:
Level 3:
On-Line and Off-Linecondition assessment
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TLM™ Condition Assessment and On-site DiagnosticsThe Three Level Approach
Mobile HV - Testing:- applied overvoltage- induced overvoltage- PD - measurement- DC - tests- loss measurements- ………
On-line essential (Level 1)Off-line advanced, HV -Testing ( Level 2, Level 3)
− winding resistance− ratio & vector group− Insulation resistance− Impedance / Uk− Po / Io at 230 / 380 V− C – tan delta windings− C – tan delta bushings− FRA – Measurement− FDS/PDC - Measurement… DGA
Insulation condition
Oil ageing Paper ageing
Furane, DPoil-parameter
Faults
- temperature profile- noise- vibration- PD - measurement- ........
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All modules in the diagnosis Level 1“essential” are to be applied on energizedtransformers. The most powerful toolbox for this application is the diagnosis ofthe insulating liquid. Standard oil tests, dissolved gas analysis and furaniccomponents analysis are well developed and reliable to detect ageing andsevere faults.Moisture measurement applied during the sample taking will provide reliabledetection of the moisture content inside the transformer insulation. Additionalstand alone modules are available to be applied when the oil tests and/or theoperating personnel gave indication for deficiencies or changes.
Level 1: Basic
TLM™ Condition Assessment and On-site DiagnosticsLevel 1: Essential
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TLM™ Condition Assessment and On-site DiagnosticsLevel 1: Essential
§DGA§ Furanic components§ Moisture (by capacitive sensor)§Visual Inspection: Leaks, Corrosion, Oil levels,Bushings, cooling, surge arrester counter...§Optional: corrosive sulphur,...
§ PD (UHF-, acoustic sensors)§ Noise measurement§ Vibration measurement§ Thermograph scans
Content of Level 1 (essential):
Additional stand alone modules:
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Parameter of the Level 1 Module:
TLM™ Condition Assessment and On-site DiagnosticsLevel 1: Essential
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TLM™ Condition Assessment and On-site DiagnosticsLevel 1: Essential
Operation and maintenance (O & M) history provide an indication of overalltransformer condition. O & M history factors that may apply are:
§ Sustained overloading§ Unusual operating temperatures indicated by gauges and continuousmonitoring§ Abnormal temperatures indicated by infrared scanning§ Nearby lightning strikes or through faults§ Abnormally high external temperatures detected§ Problems with auxiliary systems (fans, radiators, cooling water piping, pumps,motors, controls, nitrogen replenishment system, and indicating and protectiondevices)§ Increase in corrective maintenance or difficulty in acquiring spare parts
Level 1 (essential): Operational Data
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The advanced modules are applied on de-energized and disconnectedtransformers. Most measurements repeat the measurements as shown in themanufacturers test report and by comparing the results any differences will behighlighted. Modern methods such as Frequency Response Analysis (FRA) arepart of a Level 2 assessment and provide information about the insulation(dielectric) condition as well as the mechanical condition (displacements) of theactive part of a transformer.
All modules of Level 1 apply.
Level 2: Advanced
TLM™ Condition Assessment and On-site DiagnosticsLevel 2: Advanced
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§ Transformer Turns Ratio§Winding resistance§ Power factor (windings and bushings)§ Insulation resistance§ No load current and losses at low voltage§ Partial Discharges§ FRA
Additional stand alone modules:§ All modules of Level 1 apply
Content of Level 2 Diagnostics:
TLM™ Condition Assessment and On-site DiagnosticsLevel 2: Advanced
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Ratio, Winding Resistance, Impedance, No-Load, Insulation Resistance
Typical measurements for Level 2 Diagnostics:
TLM™ Condition Assessment and On-site DiagnosticsLevel 2: Advanced
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FRA
Advanced measurements for Level 2 diagnostics:
TLM™ Condition Assessment and On-site DiagnosticsLevel 2: Advanced
High Voltage Tap10
-70-60-50-40-30-20-10
0
1 10 100 1000 10000 100000 1000000 10000000Frequency
Mag
nitu
de
1U1V1V 1W1W 1U
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PD - Measurement
Advanced measurements for Level 2 diagnostics:
TLM™ Condition Assessment and On-site DiagnosticsLevel 2: Advanced
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TLM™ Condition Assessment and On-site DiagnosticsLevel 2: Advanced
C-tan-deltaAdvanced measurements for Level 2 diagnostics:
0,0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0 50 100
150
200
250
300
350
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Prüffrequenz [Hz]
tanδ
[‰] 2011
0,0
1,0
2,0
3,0
4,0
5,0
6,0
7,0
1976
1992
1997
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2011
tanδ
[‰]
C-tan-delta Measurement
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High Voltage Testing on-site is usually required following on-site repairs, factoryrepairs, refurbishment, or relocation and also performed based on the results fromthe level 1 and level 2 assessments. The SITRAM® DIAG mobile test fieldsprovides solutions for all kind of HV testing and loss (no load and/or short circuitlosses) measurement. Special test cycles or long duration tests are also possible.Level 3 assessment can be combined with all modules out of level 1 and level 2.
Level 3: Mobile HV testing
TLM™ Condition Assessment and On-site DiagnosticsLevel 3: Mobile HV testing
Pressurized cabinet with retractable roof for onsite repairs
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TLM™ Condition Assessment and On-site DiagnosticsLevel 3: Mobile HV testing
§ No load current and losses
§ Load losses and impedance
§ Applied voltage test (76kV)
§ Induced voltage test
§ PD-measurement
§ DC tests
Measurements available with the mobile test field:
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TLM™ Condition Assessment and On-site DiagnosticsLevel 3: mobile HV testing
Application of mobile test field
Measurements available with the mobile test field:
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TLM™ Condition Assessment and On-site DiagnosticsLevels 1 -2 -3
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TLM™ Condition Assessment and On-site DiagnosticsLevels 1 -2 -3
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TLM™ Condition Assessment and On-site DiagnosticsProcessing, assessing and managing data
§ Built on the experience of transformer experts for design, testing andmaintenance
§ Standardizing assessment approaches and providing families for comparison
§ Considering historical data, events and maintenance actions
§ Ensured findings and recommendations starting from basic level 1 up to highend level 3 evaluations
§ Providing measures to select and rank single transformers from a completefleet.
TLM Condition Assessment Manager
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TLM™ Condition Assessment and On-site DiagnosticsProcessing, assessing and managing data
Input data can be importeddirectly from themeasurement instrument,manually or by an importfunctionality from anexternal data base.
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TLM™ Condition Assessment and On-site DiagnosticsProcessing, assessing and managing data
Input of measured data and staticdata
Setting thresholds and assumptionsfor precession and repeatability
Building physical groups
Consolidation for final grade andsignificance
Checking for correlation betweengroups and parameters, spec. models
Findings, route cause andrecommendations
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TLM™ Condition Assessment and On-site DiagnosticsOutcome
TLM™ Condition Assessment and On-site DiagnosticsOutcome
-Transformer Fleet Management System
- Transformers ranking based on score to facilitate targeted maintenance and budget management
-Strategic planning of spares
-Fleet Reliability
© Siemens AG 2014 All rights reserved.
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© Siemens AG 2014 All rights reserved.
Thank you very much for your attention!
Service is not everything
Your reliable Service Partner. Ihr verlässlicher Servicepartner.
Juan AcostaManager – Transformer Lifecycle Management USA
Siemens EM CS TR
Wendell, NC
Mobile: (919) 376 [email protected]