Transformer Technology Seminar -...

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Transformer Technology SeminarModular approach on economic condition assessment for power transformer;data management, “Fleetscreening” and risk ranking

Pomona, CA May 24 – 25, 2016

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

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


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

• Average age of transformers >30 years

• Lead time of new transformers >1 year

• Increasing utilization

• Demand for modernization

• Demand for relocation


Market Condition

§ 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 DiagnosticsThe Three Level Approach

Level 1:

Level 2:

Level 3:

On-Line and Off-Linecondition assessment

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- ........

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


§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:

Parameter of the Level 1 Module:



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

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

§ 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:


Ratio, Winding Resistance, Impedance, No-Load, Insulation Resistance

Typical measurements for Level 2 Diagnostics:


FRA

Advanced measurements for Level 2 diagnostics:


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

PD - Measurement

Advanced measurements for Level 2 diagnostics:



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

400

Prüffrequenz [Hz]

tanδ

[‰] 2011

0,0

1,0

2,0

3,0

4,0

5,0

6,0

7,0

1976

1992

1997

2001

2006

2011

tanδ

[‰]

C-tan-delta Measurement

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

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:

TLM™ Condition Assessment and On-site DiagnosticsLevel 3: mobile HV testing

Application of mobile test field

Measurements available with the mobile test field:

TLM™ Condition Assessment and On-site DiagnosticsLevels 1 -2 -3

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


Input data can be importeddirectly from themeasurement instrument,manually or by an importfunctionality from anexternal data base.


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

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.

Disclaimer

This document contains forward-looking statements and information – that is, statements related to future, not past, events.These statements may be identified either orally or in writing by words as “expects”, “anticipates”, “intends”, “plans”,

“believes”, “seeks”, “estimates”, “will” or words of similar meaning. Such statements are based on our current expectationsand certain assumptions, and are, therefore, subject to certain risks and uncertainties. A variety of factors, many of whichare beyond Siemens’ control, affect its operations, performance, business strategy and results and could cause the actualresults, performance or achievements of Siemens worldwide to be materially different from any future results, performance

or achievements that may be expressed or implied by such forward-looking statements. For us, particular uncertaintiesarise, among others, from changes in general economic and business conditions, changes in currency exchange rates andinterest rates, introduction of competing products or technologies by other companies, lack of acceptance of new productsor services by customers targeted by Siemens worldwide, changes in business strategy and various other factors. More

detailed information about certain of these factors is contained in Siemens’ filings with the SEC, which are available on theSiemens website, www.siemens.com and on the SEC’s website, www.sec.gov. Should one or more of these risks or

uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially from thosedescribed in the relevant forward-looking statement as anticipated, believed, estimated, expected, intended, planned or

projected. Siemens does not intend or assume any obligation to update or revise these forward-looking statements in lightof developments which differ from those anticipated.

Trademarks mentioned in this document are the property of Siemens AG, it's affiliates or their respective owners.

http://www.siemens.com/

http://www.sec.gov/

© 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]

mailto:[email protected]

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