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Ali Naderian Jahromi

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I am a Professional Engineer Ontario of Canada with 20 years of experience in high voltage testing and condition assessment. I completed my PhD working at the University of Tehran and Waterloo in 2005 on the RTV coatings for outdoor insulators. I work as the director of HV services at METSCO Energy Solutions. I am an active member of IEEE Transformer Committee, the chair of IEEE C57.161 Dielectric Frequency Response and chair of IEEE C57.113 Partial Discharge Test Guide. I am also the chair of IEEE Dielectric and Electrical Insulation, Ontario, Canada since 2014. I published more than 50 papers in IEEE conferences and journals. I was a co-author of EPRI Underground Distribution Reference Book published in 2009.

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Papers by Ali Naderian Jahromi

Calculation of Transient Electromagnetic Field around a Transmission Line Subjected to Lightning Strokes

In this paper, a new method for the calculation of electromagnetic fields around a transmission l... more In this paper, a new method for the calculation of electromagnetic fields around a transmission line subjected to a lightning strike is described and discussed. The electric fields and magnetic fields are presented graphically as a function of spatial coordinate, as a function of time and as a function of both. It is believed that this exact solution have not been published before. First, a double exponential lightning surge current is injected into a transmission line. Once The temporal variations of current is known, then electric and magnetic fields can be calculated by using the field expressions for electric dipoles over infinitely conducting ground. As the calculation was done for each frequency, temporal and spatial distributions of the electromagnetic fields are obtained by an inverse Fourier transformation of all these responses.

Study, Comparison and Simulation of Power System Swing Detection and Prediction Methods

This paper describes several methods for detection and prediction of power swing phenomenon in po... more This paper describes several methods for detection and prediction of power swing phenomenon in power systems. The paper provides an overview of some conventional and new techniques. The apparent impedance of distance relays, phasor calculation and rotor angle estimation are several methods for detection of power swing, reviewed in this paper. A least square method for prediction of rotor angle is described. An algorithm for prediction of power swing based on the predicted rotor angle is studied. Results obtained from simulation studies are used to demonstrate the performance of these methods. Using simulation studies, performances of different methods are compared.

A Review of Non-Standard Artificial Contamination Withstand Test Methods of Composite Insulators

However many electric companies have used composite insulators (CI) for many years and there are ... more However many electric companies have used composite insulators (CI) for many years and there are several recommendation for their properties but there is not a universe standard for artificial contamination test of non-ceramic insulators. This paper reviews some of major non-standard pollution test methods for CI. Salt fog method cannot give consistent results with actual field results. Clean Fog test with a suitable precontamination can give better result. Besides the contamination methods, the artificial rain test for contaminated CI is also should be considered to evaluate them.

2005 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Prediction of Leakage Current of Composite Insulators in Salt Fog Test Using Neural Network

This paper presents a new prediction method for the level of the fundamental component of leakage... more This paper presents a new prediction method for the level of the fundamental component of leakage current in the early aging period. Several silicone rubber (SIR) insulators were tested in salt-fog chamber and the LC was continuously recorded. A neural network has been used to predict the level of LC in the early stage of aging of the SIR insulators. Initial value of LC and its increasing slope in the first hour are used as the input of the network and the value of LC after 10 hours is the output of the network. It was found that a 2-layer feedforward back propagation with a biased output is a suitable network to predict the LC hours based on its initial values with a maximum of 15 % error.

IAEEE Journal 1384-1 15 Vol2No

f°·Y Á ©] ¾Ì|ÀAE» ¾¼n¿Y Ä¸n» ½YËY ®Ì¿Á -¹Á{ µZ -¹Á{ ÃZ¼ -½Zf» Á ÌWZa 1384 Ã¬» ÉZ¿Á¯ Ä¬¸u ÊuY |Ì» ... more f°·Y Á ©] ¾Ì|ÀAE» ¾¼n¿Y Ä¸n» ½YËY ®Ì¿Á -¹Á{ µZ -¹Á{ ÃZ¼ -½Zf» Á ÌWZa 1384 Ã¬» ÉZ¿Á¯ Ä¬¸u ÊuY |Ì» c| ÉZ ÄÌ^ ZY ] ÉÂ«Z § É¼Ì¸a ÉZÅ Ê°Ëf°·Y ½Y Ê»AEm ½ZË{Z¿ Ê¸ 1 |Àa ËZÀ |Ìn» 1 ÊÀv» ¾Ìu 1 1 eÂÌb»Z¯ Á ©] Ê|ÀAE» Ã|°¿Y{ , ½YAEe ÃZ´¿Y{ ½YËY ,½YAEe , Ã|Ì°q : ¬» { Ê°Ëf°·Y ½Y|Ì» ËÂe dÌ¼ÅY Ä] ÄmÂe Z] Ã ZÅ É ÉÁ Á Ã¬» ÄfÅ ¶yY{ { ½Y|Ì» ËÂe µfÀ¯ dAEm dËÂb»Z| Ì» ËÂe ,½M t É{| ¶u Á |Ë{³ ÉZ ÄÌ^ Ê°Ëf°·Y ½Y | ¹Zn¿Y {Á|v» ½Z¼·Y Á Âe ½Y|Ì» . ÊuY Ä·Z¬» ¾ËY { dËÂb»Z¯ Ã¬» ®Ë ÉY] Z¿Á¯ Ä¬¸u 230 ¾°Ì¸Ì Â¿ Y d·ÁÂ¸Ì¯ º¼ÌÀÌ» Ä] ÄmÂe Z] ,Y{Z¿Z¯ ÂËZf¿Y ½ZfY µZ¬f¿Y Ây { µÁY|f» ]Y Z¬¿ ÄÌ¸¯ { ½Y|Ì» c| º¼Ë¯Z» ½{¯ cÂ ¼Ì¸a Ã¬» ºAE» dY Äf §³ . Ä¯ {Y{ ½Z¿ ZAEËZ ÄÌ^ { Z»Á· ½Y|Ì» º¼Ë¯Z» Ã¬» ÉÂ«Z § {Áf°·Y Y eÓZ]{ |¿YÂfÌ» Ä°¸] dÌ¿ Ã¬» ÉY|f]Y {Â Ã|ÅZ» º¼Ë¯Z» ¾ËY µZ¬f¿Y y Ä] ¶f» . { Ä°ÌeÂ{ ¿ |» Ä¬¿ ®Ë ½Y|Ì» c| ½{¯ º¼ÌÀÌ» ,Z¿Á¯ Ä¬¸u ÊuY Y« ½Y|Ì» c| |ËZ] Ä°¸] {Â]|ÅYÂz¿ Ê¬Ì«{ ÊuY ,{Ì³ Z¿Á¯ Ä¬¸u ÉÁ Á ½M ¥YY ÉZ § Á Ã¬» ¶¯ µÂ { º¼Ë¯Z» {Â Ä ·Z» . Ä¯ |Å|Ì» ½Z¿ Ã¬» Ê¬ §Y {Y|f»Y { ½Y|Ì» ËÂe { ¾ÌÀr¼Å Á fq Á ÄfÅ µZeY ¶v» { ½Y|Ì» c| dY º¼Ë¯Z» ÉYY{ YÂÅ Á fq cÁZn» .Ë{ ¥ Y ËY §Y Y eiÂ» ,Ä¬¸u t ÉÁ ½Y|Ì» c| ÅZ¯ { Ã^Àq Z dZ¿Á¯ Ä¬¸u {Ây Z ËY §Y . µfÀ¯ hZ] ÊuY Â¿ ¾ËY ÉÁ Á ]Y ¾°Ì¸Ì Á É¤» ¾Ì] Ä¸Z § { ,Ã¬» t { ½Y|Ì» {ÂÌ» Z¿Á¯ Ä¬¸u t . ,Z¿Á¯ Á] Y ÉÌ³Â¸m ] ÃÁÔ ¾ËY]ZÀ] ½Y|Ì» c| ÌiZe Y Ä¯ ½M ¶yY{ Á Ã¬» t ÉÁ Ê Â» |Ë|e Y Ô³^ËZ § Á ¼Ì¸a ËZ § Ê» Ê» ÄfZ¯ |À¯ {Â . ÃYÁ É|Ì¸¯ ÉZÅ : Ã¬» ,Z¿Á¯ Ä¬¸u ÄÌ^ ,É¼Ì¸a ÉZÅ ÉZ Ê°Ëf°·Y ½Y|Ì» Abstract: Electric field distribution of polymeric insulators inside the fiberglass and on the surface of polymer must be studied carefully. This paper presents a ½YËY ®Ì¿Áf°·Y Á ©] ¾Ì|ÀAE» ¾¼n¿Y Ä¸n» -¹Á{ µZ -¹Á{ ÃZ¼ -½Zf» Á ÌWZa

Transformers and Equipment

This chapter reviews several aspects related to transformers, including transformer losses, loadi... more

Fanni Journal 1383 Short circuit impedance calculation using energy

Prediction of leakage current of non-ceramic insulators in early aging period

The paper presents a neural network based prediction technique for the leakage current (LC) of no... more The paper presents a neural network based prediction technique for the leakage current (LC) of nonceramic insulators during salt-fog test. Nearly 50 distribution class silicone rubber (SIR) insulators with three different voltage classes have been tested in a salt-fog chamber, where the LC has been continuously recorded for at least 100 h. A boundary for early aging period is defined by the rate of change of the LC instead of a fixed threshold value. Consequently, the Gaussian radial basis network has been adopted to predict the level of LC at the early stage of aging of the SIR insulators and is compared with a classical network. The initial values of LC and its rate of change at 10 min intervals for the first 5 h are selected as the input to the network, and the final value of LC of the early aging period is considered as the output of the network. It is found that Gaussian radial basis function network with a random optimizing training method is an appropriate network to predict the LC with a 3.5-5.3% accuracy, if the training data and the testing data are selected from the same type of SIR insulators.

Detection and Classification of Defects in Ceramic Insulators using RF Antenna

Defects in ceramic insulators like broken, cracked and punctured discs give rise to the initiatio... more Defects in ceramic insulators like broken, cracked and punctured discs give rise to the initiation of partial discharge (PD) activities within the samples which has a detrimental effect on the insulator life. Hence it is important for the utilities to identify such defective samples as early as possible so that appropriate replacement strategies can be devised. The work presented in this paper involves the investigation of a number of cases of insulator defects, with the goal of developing an online RF-based PD technique for monitoring ceramic disc insulators. The three classes examined are a cracked ceramic insulator disc; a disc with a hole through the cap, and a completely broken insulator disc. The defective discs are considered individually and are also incorporated into strings of 2, 3, and 4 insulators. The captured RF pulses are processed by extracting wavelet packet based features. Feature reduction and selection is carried out and classification results are obtained. To classify the discharges arising from different types of defects, an artificial neural network (ANN) algorithm is applied to the extracted features, and recognition rates of more than 95% were reported for each class. The results of preliminary field tests carried out on a 40 feet high test transmission tower are also reported and their analysis showed good discrimination between the different defect types.

A Method of Increment Short-Circuit Current in Test of Ceramic and Composite Polluted Insulators

by Ali Naderian Jahromi and M. Sanaye-Pasand

IEEE Transactions on Power Delivery, 2000

One of the most important factors in an artificial pollution test of transmission and distributio... more One of the most important factors in an artificial pollution test of transmission and distribution insulators of power systems is the short-circuit current of the source. Most laboratories do not have strong source and test transformers. In this paper a test setup has been introduced to improve the performance of high-voltage laboratories for pollution test. It is based on adding

Calculation of Transient Electromagnetic Field around a Transmission Line Subjected to Lightning Strokes

In this paper, a new method for the calculation of electromagnetic fields around a transmission l... more In this paper, a new method for the calculation of electromagnetic fields around a transmission line subjected to a lightning strike is described and discussed. The electric fields and magnetic fields are presented graphically as a function of spatial coordinate, as a function of time and as a function of both. It is believed that this exact solution have not been published before. First, a double exponential lightning surge current is injected into a transmission line. Once The temporal variations of current is known, then electric and magnetic fields can be calculated by using the field expressions for electric dipoles over infinitely conducting ground. As the calculation was done for each frequency, temporal and spatial distributions of the electromagnetic fields are obtained by an inverse Fourier transformation of all these responses.

Study, Comparison and Simulation of Power System Swing Detection and Prediction Methods

This paper describes several methods for detection and prediction of power swing phenomenon in po... more This paper describes several methods for detection and prediction of power swing phenomenon in power systems. The paper provides an overview of some conventional and new techniques. The apparent impedance of distance relays, phasor calculation and rotor angle estimation are several methods for detection of power swing, reviewed in this paper. A least square method for prediction of rotor angle is described. An algorithm for prediction of power swing based on the predicted rotor angle is studied. Results obtained from simulation studies are used to demonstrate the performance of these methods. Using simulation studies, performances of different methods are compared.

A Review of Non-Standard Artificial Contamination Withstand Test Methods of Composite Insulators

However many electric companies have used composite insulators (CI) for many years and there are ... more However many electric companies have used composite insulators (CI) for many years and there are several recommendation for their properties but there is not a universe standard for artificial contamination test of non-ceramic insulators. This paper reviews some of major non-standard pollution test methods for CI. Salt fog method cannot give consistent results with actual field results. Clean Fog test with a suitable precontamination can give better result. Besides the contamination methods, the artificial rain test for contaminated CI is also should be considered to evaluate them.

2005 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Prediction of Leakage Current of Composite Insulators in Salt Fog Test Using Neural Network

This paper presents a new prediction method for the level of the fundamental component of leakage... more This paper presents a new prediction method for the level of the fundamental component of leakage current in the early aging period. Several silicone rubber (SIR) insulators were tested in salt-fog chamber and the LC was continuously recorded. A neural network has been used to predict the level of LC in the early stage of aging of the SIR insulators. Initial value of LC and its increasing slope in the first hour are used as the input of the network and the value of LC after 10 hours is the output of the network. It was found that a 2-layer feedforward back propagation with a biased output is a suitable network to predict the LC hours based on its initial values with a maximum of 15 % error.

IAEEE Journal 1384-1 15 Vol2No

f°·Y Á ©] ¾Ì|ÀAE» ¾¼n¿Y Ä¸n» ½YËY ®Ì¿Á -¹Á{ µZ -¹Á{ ÃZ¼ -½Zf» Á ÌWZa 1384 Ã¬» ÉZ¿Á¯ Ä¬¸u ÊuY |Ì» ... more f°·Y Á ©] ¾Ì|ÀAE» ¾¼n¿Y Ä¸n» ½YËY ®Ì¿Á -¹Á{ µZ -¹Á{ ÃZ¼ -½Zf» Á ÌWZa 1384 Ã¬» ÉZ¿Á¯ Ä¬¸u ÊuY |Ì» c| ÉZ ÄÌ^ ZY ] ÉÂ«Z § É¼Ì¸a ÉZÅ Ê°Ëf°·Y ½Y Ê»AEm ½ZË{Z¿ Ê¸ 1 |Àa ËZÀ |Ìn» 1 ÊÀv» ¾Ìu 1 1 eÂÌb»Z¯ Á ©] Ê|ÀAE» Ã|°¿Y{ , ½YAEe ÃZ´¿Y{ ½YËY ,½YAEe , Ã|Ì°q : ¬» { Ê°Ëf°·Y ½Y|Ì» ËÂe dÌ¼ÅY Ä] ÄmÂe Z] Ã ZÅ É ÉÁ Á Ã¬» ÄfÅ ¶yY{ { ½Y|Ì» ËÂe µfÀ¯ dAEm dËÂb»Z| Ì» ËÂe ,½M t É{| ¶u Á |Ë{³ ÉZ ÄÌ^ Ê°Ëf°·Y ½Y | ¹Zn¿Y {Á|v» ½Z¼·Y Á Âe ½Y|Ì» . ÊuY Ä·Z¬» ¾ËY { dËÂb»Z¯ Ã¬» ®Ë ÉY] Z¿Á¯ Ä¬¸u 230 ¾°Ì¸Ì Â¿ Y d·ÁÂ¸Ì¯ º¼ÌÀÌ» Ä] ÄmÂe Z] ,Y{Z¿Z¯ ÂËZf¿Y ½ZfY µZ¬f¿Y Ây { µÁY|f» ]Y Z¬¿ ÄÌ¸¯ { ½Y|Ì» c| º¼Ë¯Z» ½{¯ cÂ ¼Ì¸a Ã¬» ºAE» dY Äf §³ . Ä¯ {Y{ ½Z¿ ZAEËZ ÄÌ^ { Z»Á· ½Y|Ì» º¼Ë¯Z» Ã¬» ÉÂ«Z § {Áf°·Y Y eÓZ]{ |¿YÂfÌ» Ä°¸] dÌ¿ Ã¬» ÉY|f]Y {Â Ã|ÅZ» º¼Ë¯Z» ¾ËY µZ¬f¿Y y Ä] ¶f» . { Ä°ÌeÂ{ ¿ |» Ä¬¿ ®Ë ½Y|Ì» c| ½{¯ º¼ÌÀÌ» ,Z¿Á¯ Ä¬¸u ÊuY Y« ½Y|Ì» c| |ËZ] Ä°¸] {Â]|ÅYÂz¿ Ê¬Ì«{ ÊuY ,{Ì³ Z¿Á¯ Ä¬¸u ÉÁ Á ½M ¥YY ÉZ § Á Ã¬» ¶¯ µÂ { º¼Ë¯Z» {Â Ä ·Z» . Ä¯ |Å|Ì» ½Z¿ Ã¬» Ê¬ §Y {Y|f»Y { ½Y|Ì» ËÂe { ¾ÌÀr¼Å Á fq Á ÄfÅ µZeY ¶v» { ½Y|Ì» c| dY º¼Ë¯Z» ÉYY{ YÂÅ Á fq cÁZn» .Ë{ ¥ Y ËY §Y Y eiÂ» ,Ä¬¸u t ÉÁ ½Y|Ì» c| ÅZ¯ { Ã^Àq Z dZ¿Á¯ Ä¬¸u {Ây Z ËY §Y . µfÀ¯ hZ] ÊuY Â¿ ¾ËY ÉÁ Á ]Y ¾°Ì¸Ì Á É¤» ¾Ì] Ä¸Z § { ,Ã¬» t { ½Y|Ì» {ÂÌ» Z¿Á¯ Ä¬¸u t . ,Z¿Á¯ Á] Y ÉÌ³Â¸m ] ÃÁÔ ¾ËY]ZÀ] ½Y|Ì» c| ÌiZe Y Ä¯ ½M ¶yY{ Á Ã¬» t ÉÁ Ê Â» |Ë|e Y Ô³^ËZ § Á ¼Ì¸a ËZ § Ê» Ê» ÄfZ¯ |À¯ {Â . ÃYÁ É|Ì¸¯ ÉZÅ : Ã¬» ,Z¿Á¯ Ä¬¸u ÄÌ^ ,É¼Ì¸a ÉZÅ ÉZ Ê°Ëf°·Y ½Y|Ì» Abstract: Electric field distribution of polymeric insulators inside the fiberglass and on the surface of polymer must be studied carefully. This paper presents a ½YËY ®Ì¿Áf°·Y Á ©] ¾Ì|ÀAE» ¾¼n¿Y Ä¸n» -¹Á{ µZ -¹Á{ ÃZ¼ -½Zf» Á ÌWZa

Transformers and Equipment

This chapter reviews several aspects related to transformers, including transformer losses, loadi... more

Fanni Journal 1383 Short circuit impedance calculation using energy

Prediction of leakage current of non-ceramic insulators in early aging period

The paper presents a neural network based prediction technique for the leakage current (LC) of no... more The paper presents a neural network based prediction technique for the leakage current (LC) of nonceramic insulators during salt-fog test. Nearly 50 distribution class silicone rubber (SIR) insulators with three different voltage classes have been tested in a salt-fog chamber, where the LC has been continuously recorded for at least 100 h. A boundary for early aging period is defined by the rate of change of the LC instead of a fixed threshold value. Consequently, the Gaussian radial basis network has been adopted to predict the level of LC at the early stage of aging of the SIR insulators and is compared with a classical network. The initial values of LC and its rate of change at 10 min intervals for the first 5 h are selected as the input to the network, and the final value of LC of the early aging period is considered as the output of the network. It is found that Gaussian radial basis function network with a random optimizing training method is an appropriate network to predict the LC with a 3.5-5.3% accuracy, if the training data and the testing data are selected from the same type of SIR insulators.

Detection and Classification of Defects in Ceramic Insulators using RF Antenna

Defects in ceramic insulators like broken, cracked and punctured discs give rise to the initiatio... more Defects in ceramic insulators like broken, cracked and punctured discs give rise to the initiation of partial discharge (PD) activities within the samples which has a detrimental effect on the insulator life. Hence it is important for the utilities to identify such defective samples as early as possible so that appropriate replacement strategies can be devised. The work presented in this paper involves the investigation of a number of cases of insulator defects, with the goal of developing an online RF-based PD technique for monitoring ceramic disc insulators. The three classes examined are a cracked ceramic insulator disc; a disc with a hole through the cap, and a completely broken insulator disc. The defective discs are considered individually and are also incorporated into strings of 2, 3, and 4 insulators. The captured RF pulses are processed by extracting wavelet packet based features. Feature reduction and selection is carried out and classification results are obtained. To classify the discharges arising from different types of defects, an artificial neural network (ANN) algorithm is applied to the extracted features, and recognition rates of more than 95% were reported for each class. The results of preliminary field tests carried out on a 40 feet high test transmission tower are also reported and their analysis showed good discrimination between the different defect types.

A Method of Increment Short-Circuit Current in Test of Ceramic and Composite Polluted Insulators

by Ali Naderian Jahromi and M. Sanaye-Pasand

IEEE Transactions on Power Delivery, 2000

One of the most important factors in an artificial pollution test of transmission and distributio... more One of the most important factors in an artificial pollution test of transmission and distribution insulators of power systems is the short-circuit current of the source. Most laboratories do not have strong source and test transformers. In this paper a test setup has been introduced to improve the performance of high-voltage laboratories for pollution test. It is based on adding