Partial discharge diagnostics of power transformers

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Project abstract

The aim with this thesis work is to improve diagnostic criteria for large high voltage power transformers. Many insulation failures in power transformers have a foregoing activity of partial discharges due to defects inside the insulation. PD activity of certain type of defects can produce problem for transformer insulation if it continue for long duration. Therefore it is important to identify the type of defect from the PD activity so to recognize the current danger for the transformer. It is also very important to understand how the insulation behaves adjacent to a defect. Aging process is investigated for one the most common defect which is a cavity discharge.

Summary of work

Laboratory setups were designed and built that simulate real defect inside a transformer. Signature of PD for those defects where recorded and compared.

Ageing of oil-impregnated paper was investigated for a case of cavity discharge. The evolution of PD parameters from inception of PD until puncture breakdown of the sample was investigated. Effect of various parameters was investigated on dielectric response of oil impregnated paper. It was found that PD activity can reduce the impulse breakdown strength significantly and it has a great influence on dielectric response of oil-impregnated paper.

Event log

2014. Best Poster Presentation award, at 7th International Symposium on Electrical Insulating Materials (ISEIM), 1st--5th June 2014, Toki Messe, Niigata City, Japan.

Project reference-group

Niclas Schönborg,  Svenska Kraftnät
Fredrik Carlsson,  Vattenfall
Peter Werelius,  Megger
Anders Åkesson,  Fortum
Thomas Eriksson,  ABB Corporate Research

Publications by this researcher

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Dielectric Frequency Response of Oil-impregnated Paper : the Effect of Partial Discharges Compared to other Influences
M. Ghaffarian Niasar,   Nathaniel Taylor,   Hans Edin,   Respicius Clemence Kiiza.
2016,   IEEE transactions on dielectrics and electrical insulation, vol. 23(3)

Impact of thermal and electrical aging on breakdown strength of oil-impregnated paper
Ghaffarian Mohamad Niasar,   Nathaniel Taylor,   Hans Edin,   R. C. Kiiza.
2015,   IEEE Eindhoven PowerTech, PowerTech 2015, 29 June 2015 through 2 July 2015

Mechanisms of Electrical Ageing of Oilimpregnated Paper due to Partial Discharges
Mohamad Ghaffarian Niasar.
2015,   Thesis (PhD), KTH Royal Institute of Technology, TRITA-EE 2015:006

Partial Discharges in a Cavity Embedded in Oil-Impregnated Paper : Effect of Electrical and Thermal Aging
Mohamad Ghaffarian Niasar,   Nathaniel Taylor,   Patrick Janus,   Xiaolei Wang,   Hans Edin,   Respicius Clemence Kiiza.
2015,   IEEE transactions on dielectrics and electrical insulation, vol. 22(2)

Effect of Partial Discharges on Thermal Breakdown of Oil Impregnated Paper
Mohamad Ghaffarian Niasar,   Respicius Clemence Kiiza,   Nathaniel Taylor,   Hans Edin.
2015,   IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING, vol. 10

The effect of PD by-products on the dielectric frequency response of oil-paper insulation comprising of a small cavity
Respicius Clemence Kiiza,   Mohamad Ghaffarian Niasar,   Roya Nikjoo,   Xiaolei Wang,   Hans Edin.
2015,   IEEE transactions on dielectrics and electrical insulation, vol. 22(5)

Surface charge dynamics studied by the temporal evolution of the corona charging current
Xiaolei Wang,   Nathaniel Taylor,   Mohamad Ghaffarian Niasar,   Respicius Clemence Kiiza,   Hans Edin.
2015,   Journal of Electrostatics, vol. 76

Partial Discharge Analysis in a Metal-dielectric Air Gap on Machine Insulation at Arbitrary Testing Voltage
Xiaolei Wang,   Respicius Clemence Kiiza,   Nathaniel Taylor,   Mohamad Ghaffarian Niasar,   Hans Edin.
2014,   International Symposium on Electrical Insulating Materials (ISEIM), JUN 01-05, 2014, Niigata, JAPAN

Effect of Partial Discharges on Thermal Breakdown of Oil Impregnated Paper
Mohamad Ghaffarian Niasar,   Respicius Clemence Kiiza,   Nathaniel Taylor,   Xiaolei Wang,   Hans Edin,   Stefan Tenbohlen.
2014,   Conference of ISEIM 2014,June 1-5, 2014 Niigata City, Japan

Change in Partial Discharge Activity as Related to Degradation Level in Oil-Impregnated Paper Insulation : Effect of High Voltage Impulses
Respicius Clemence Kiiza,   Mohamad Ghaffarian Niasar,   Roya Nikjoo,   Xiaolei Wang,   Hans Edin.
2014,   IEEE transactions on dielectrics and electrical insulation, vol. 21(3)

Effect of Dielectric Material on Decay of Surface Charge Deposited by Corona Discharge
Xiaolei Wang,   Respicius Clemence Kiiza,   Mohamad Ghaffarian Niasar,   Roya Nikjoo,   Nathaniel Taylor,   Hans Edin.
2013,   18th International Symposium on High Voltage Engineering (ISH), 2013 Korea

Insulation Condition Diagnostics of Oil-impregnated Paper by Utilizing Power System Transients
Roya Nikjoo,   Nathaniel Taylor,   Respicius Clemence Kiiza,   Hans Edin,   Mohamad Ghaffarian,   Xiaolei Wang.
2013,   18th International Symposium on High Voltage Engineering

Lumped-circuit modeling of surface charge decay in a needle-plane geometry
Xiaolei Wang,   Nathaniel Taylor,   Mohamad Ghaffarian Niasar,   Respicius Clemence Kiiza,   Hans Edin.
2013,   Nordic Insulation Symposium (Nord-IS), NTNU, Trondhem, Norway, June 9–12, 2013

Effect of High Voltage Impulses on Surface Discharge at the Oil-Paper Interface
Respicius Clemence Kiiza,   Mohamad Ghaffarian Niasar,   Roya Nikjoo,   Xiaolei Wang,   Hans Edin.
2013,   Nordic Insulation Symposium (NORD-IS)

Aging of oil impregnated paper due to Pd activity
Mohamad Ghaffarian Niasar,   Hans Edin,   Xiaolei Wang,   Respicus Kiiza,   Oya Nikjoo.
2013,   18th International Symposium on High Voltage Engineering, August 25th-30th 2013, Seoul, South Korea

Oil Aging due to Partial Discharge Activity
Mohamad Ghaffarian Niasar,   Hans Edin,   Respicus Kiiza.
2013,   23rd NORDIC INSULATION SYMPOSIUM,NORDI-IS13 June 9–12, 2013 Trondheim, Norway

Dielectric response measurement of power transformer bushing by utilizing high voltage transients
Roya Nikjoo,   Nathaniel Taylor,   Mohamad Ghaffarian Niasar,   Hans Edin.
2012,   2012 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2012, 14 October 2012 through 17 October 2012, Montreal, QC

Comparison of phase resolved partial discharge patterns in small test samples, bushing specimen and aged transformer bushing
Respicius Clemence Kiiza,   Mohamad Ghaffarian Niasar,   Roya Nikjoo,   Xiaolei Wang,   Hans Edin,   Z. Ahmed.
2012,   2012 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2012

Effect of high voltage impulses on partial discharge activity in a cavity embedded in paper insulation
Respicius Clemence Kiiza,   Roya Nikjoo,   Mohamad Ghaffarian Niasar,   Xiaolei Wang,   Hans Edin.
2012,   2012 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2012

Effect of temperature on surface discharge in oil
Mohamad Ghaffarian Niasar,   Respicius Clemence Kiiza,   Xiaolei Wang,   Roya Nikjoo,   Hans Edin.
2012,   2012 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2012

Partial discharge analysis in a needle-plane gap with repetitive step voltage
Xiaolei Wang,   Mohamad Ghaffarian Niasar,   Respicius Clemence Kiiza,   Hans Edin.
2012,   2012 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2012

Partial Discharge Signatures of Defects in Insulation Systems Consisting of Oil and Oil-impregnated Paper
Mohamad Ghaffarian Niasar.
2012,   Thesis (Licentiate), KTH Royal Institute of Technology, Trita-EE 2012:059

Modeling of Partial Discharge in Transformer Winding by Multi-Conductor Transmission Line Model
S. M. Hassan Hosseini,   M. Vakilian,   M. Ghaffarian Niasar.
2012,   International Review of Electrical Engineering, vol. 7(2)

Partial Discharge Characteristics Due to Air and Water Vapor Bubbles in Oil
Mohamad Ghaffarian Niasar,   Hans Edin,   Xiaolei Wang,   Respicius Clemence Kiiza.
2011,   17th International Symposium on High Voltage Engineering, August 22nd-26th 2011, Hannover, Germany

Partial Discharge Due to Bubbles in Oil
Mohamad Ghaffarian Niasar,   Hans Edin.
2011,   Nordic Insulation Symposium, June 2011, Tampere, Finland

Corona in oil as a function of geometry, temperature and humidity
Mohamad Ghaffarian Niasar,   Hans Edin.
2010,   2010 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2010

Publication list last updated from DiVA on 2024-01-10 15:20.

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