Condition assessment and remaining life of power transformersVictor SokolovZTZ-Service Co, ZaporozhyeZalya Berler

ZTZ-Service Intern.

USA

ZAPOROZHYE WAS THE TRANSFORMERS CAPITAL IN THE FORMER USSRMay 1946 Decision to construct the factory

Oct.1949-Tested the first transformer 1000 kVA

1955- Tested the first transformer 400 kV

1959-Establishment of the Transformer Research Institute

1966-Commissioning the first transformer750 kV

SCIENTIFIC & ENGINEERING CENTERZTZ-SERVICE

1954-Setting up Engineering Installation & Maintenance Department, later ZTZ-Service

1964-The first experience with In-Field Refurbishment and uprating 400KV to 500KV transformers

1970Developing the Guedelines on Installation Repair & Insulation Processing of 110-750 kV transformers

1978-Recognized as a leading company in the USSR

SCIENTIFIC & ENGINEERING CENTERZTZ-SERVICE

1991-Establishment of ZTZ-Service as Independent Company1993-Developing conceptions of Functional Diagnostic and Life Extension 1991-Member of OF CIGRE.Leading position in LIFE MANAGEMENT

1993-Member of DOBLE Committees

1998 -Certificate ISO 9001

ZTZ-SERVICE EXPERIENCE

Repair,Refurbishment,Modification,Life Extension About 2000 Power Transformers & Shunt Reactors

Investigation of failuresData base contains over 4000 failures in1965-2000

Diagnostic,Life AssessmentOver 300 units in the period 1995-2002

ZTZ-SERVICE EXPERIENCEResearching works: developing diagnostic & Processing techniques

Full Engineering support of Power Station and PowerUtilities worldwide

Design review of new and service transformers and shunt reactors ; equipment acceptanceDesign modification and developing the design documentation; specification

Life assessment and advisory for life extensionImprovement of maintenance techniques Advanced activity

ZTZ-Service InternationalDeveloping and supplying On-Line MonitoringTechniques

Developing and supplying On-Line Processing Techniques

Technical expertise

Worldwide activity

Set up in USA in 2001

Scope of the Courses

Scope of the Courses1.Transformer population.The past and The presentLife of Transformers.Whats that?

2. Insulation deterioration

3. Condition assessment methodology

4. Transformer design review

5. Failure model elaboration

6.Condition assessment of dielectric system

Scope of the Courses

7. Insulation Life Assessment

| Insulation Life Model Mechanism of degradation

How to maintain ageing status of a transformer?

Scope of the Courses

8.Oil is a powerful diagnostic tool9.Assessment of Electromagnetic system10. Assessment of mechanical condition11.Identification of typical defects in HV bushings12. Assessment of condition of LTCScope of the Courses

Scope of the Courses13. In-Site Partial Discharge Test14.On- Line bushings and current transformer test15. Identification of the condition of gassingTransformer17. Transformer on-line processing18.General consulting

For presentations have been used:Findings and Experience of ZTZ-Service CoRecent developments of CIGREPublication and discussions at Doble Clients CommitteesIEEE Guides and ProceedingsEPRI Proceedings

CIGRE for UtilitiesGuides for transformer life management. WG 12.18Moisture Equilibrium and migration. WG 12.18Users Specification WG 12.14Transformer Design Review WG12.20Short Circuit performance WG 12.19Economical aspects of life management WG 12.22New Guide for DGA Interpretation TF 15/12-11Insulation life assessment TF15.01.10

1. Transformer Life Management. CIGRE2. Considerations on Power Transformer condition based maintenance.EPRI3. Transformer Life Assessment, CIGRE WG 12.18.DOBLE4. Effective Methods of insulation system condition in Power Transformers: a view based on practical Experience.IEEE5. Assessment of Power Transformer Insulation Condition. IEEE6, Internal Insulation Failure Mechanisms in HV Equipment under service condition.CIGRE

Technical papers of authors

7. Evaluation of power transformer insulation through measurements of dielectric characteristics.DOBLE8. On-Site Partial Discharge Measurement of Transformers. DOBLE9. Experience with Detection and Identification of winding buckling in Power transformers. DOBLE10. Transformer Fluid: a powerful tool for the management of ageing transformer population. TechCON11. Transformer Risk assessment consideration. TechCon12. "Transformer is gassing-What to do" . EPRI

Technical papers of authors

13. Evaluation and Identification of typical defects and failure modes of 110-750 kV Bushings. DOBLE14Bushings and HV Current Transformerson-line monitoring using M4000 Analyzer. DOBLE15. Experience with in-field assessment of water contamination of Large Power Transformers. EPRI16. Experience with life assessment and refurbishment of 400kV Shunt Reactors. DOBLE17.Experienced with life management of 750 kV GSU transformers at the 1000 MW units of Zaporozhskaya Nuclear Power Plant. DOBLE

Technical papers of authors

Appreciate your questions and comments in a course of the seminar