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Demetrios A Tziouvaras

from Vacaville, CA
Age ~71
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Also known as:
Dmetrios A Tziouvaras, Deme Tziouvaras, Demetrios Tziouvara
Phone and address:
3850 Skyhawk Ln, Vacaville, CA 95688
(707) 446-7955
Related to:
Cana M White, 46Kathryn CordesBryce Cordes, 79Shaun Cordes, 39David M Duncan, 66Debra Cordes, 72
Connected to:
Steven Y Tzirlin, 51Zois Tzitzifas, 55Constantine D Tzitzis, 39Vlasios Tzivas, 68Guri Tzivion, 59Manuel Tzoc, 49Doichin Y Tzolov, 61Tzonu Tzonev, 35Yiftach Tzori, 66Olga Tzortzatos, 51

Demetrios Tziouvaras Phones & Addresses

  • 3850 Skyhawk Ln, Vacaville, CA 95688 (707) 446-7955
  • 7771 Timm Rd, Allendale, CA 95688 (707) 446-7955 (707) 447-7575
  • Dublin, CA
  • San Ramon, CA

Public records

Vehicle Records

Demetrios Tziouvaras

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Address:
3850 Skyhawk Ln, Vacaville, CA 95688
VIN:
WDBUF77X37B122411
Make:
MERCEDES-BENZ
Model:
E-CLASS
Year:
2007

Resumes

Resumes

Demetrios Tziouvaras Photo 1

Professor At Sel University

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Location:
San Francisco, CA
Industry:
Electrical/Electronic Manufacturing
Work:
Sel Aug 1998 - Mar 2013
Senior Research Engineer
Sel Aug 1998 - Mar 2013
Professor at Sel University
Pacific Gas and Electric Company Jun 1980 - Aug 1998
Principal Engineer
Education:
Santa Clara University
Master of Science, Masters, Electrical Engineering University of New Mexico School of Engineering
Bachelors, Bachelor of Science, Electrical Engineering
Skills:
Electrical Engineering
Power System Protection
Development of Advanced Numerical Relay Algorithms
Power System Transients
Emtp/Atp and Rtds Modeling
Demetrios Tziouvaras Photo 2

Professor, Sel University

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Location:
130 Allison Ct, Vacaville, CA 95688
Industry:
Electrical/Electronic Manufacturing
Work:
Sel Aug 1998 - Feb 2013
Senior Research Engineer, Sel
Sel Aug 1998 - Feb 2013
Professor, Sel University
Pacific Gas and Electric Company Jun 1980 - Jul 1998
Principal Protection Engineer
Education:
Santa Clara University 1986 - 1986
Master of Science, Masters, Electrical Engineering The University of New Mexico 1978 - 1980
Bachelors, Bachelor of Science, Electrical Engineering
Skills:
Power Systems
Electric Power
Electrical Engineering
Relays
Power Distribution
Engineering
Power Protection
Smart Grid
Automation
Control Systems Design
Power Electronics
Protection
Power Generation
Protective Relays
Commissioning
Power Plants
Electricity
Scada
High Voltage
Electricians
Power System Protection
Emtp
Power System Studies
Power System Transients
Ps Disturbance Analysis
Languages:
English
Greek
Demetrios Tziouvaras Photo 3

Demetrios Tziouvaras

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Publications

Us Patents

Line Differential Protection System For A Power Transmission Line

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US Patent:
6518767, Feb 11, 2003
Filed:
Oct 19, 2000
Appl. No.:
09/693669
Inventors:
Jeffrey B. Roberts - Viola ID
Gabriel Benmouyal - Boucherville, CA
Hector Altuve-Ferrer - Nuevo Leon, MX
Ralph Folkers - Pullman WA
Demetrios Tziouvaras - Vacaville CA
Assignee:
Schweitzer Engineering Laboratories, Inc. - Pullman WA
International Classification:
G01R 3108
US Classification:
324521, 702 59, 361 80
Abstract:
In a power line current differential protection system, all three phase current values (I , I and I ) are obtained from both the local end and the remote end of a power transmission line. The magnitude of the ratio of the remote current values to the local current values are calculated. Also, the angle difference between the local and the remote current values for each phase are calculated. Comparison elements then compare the ratio and angle values against preselected values which establish a restrain region in the current ratio plane. Current values which result in the ratio being within the region do not result in a tripping signal for the circuit breaker on the power transmission line, while current values which result in a ratio outside of the region result in a tripping of the circuit breaker. Similar circuitry is used for negative sequence current quantities, with the negative sequence preselected values being set substantially lower to produce a more sensitive response to possible faults in the line.

Fault Type Selection System For Identifying Faults In An Electric Power System

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US Patent:
6525543, Feb 25, 2003
Filed:
Oct 20, 2000
Appl. No.:
09/693607
Inventors:
Jeffrey B. Roberts - Viola ID
Demetrios Tziouvaras - Vacaville CA
Assignee:
Schweitzer Engineering Laboratories - Pullman WA
International Classification:
G01R 3108
US Classification:
324522, 702 59
Abstract:
The fault identification system includes a first logic circuit which is responsive to conventional protective elements which recognize the presence of low resistance single line-to-ground faults for the A, B and C phases on a power transmission line. The first logic circuit includes a portion thereof for recognizing and providing an output indication of single line-to-ground faults, faults involving two phases and three-phase faults, in response to the occurrence of different combinations of outputs from the protective elements. A calculation circuit, when enabled, is used to determine the angular difference between the total zero sequence current and the total negative sequence current for high resistance faults when the protective elements themselves cannot identify fault conditions. The angular difference is in one of three pre-selected angular sectors. An angular difference in the first sector indicates an A phase-to-ground fault or a BC phase-to-phase to ground fault; an angular difference in the second sector indicates a B phase-to-ground fault or a C phase-to-phase to ground fault; and a signal in the third sector indicates a C phase-to-ground fault or an AB phase-to-phase to ground fault.

Systems And Methods For Protection Of Electrical Networks

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US Patent:
7457088, Nov 25, 2008
Filed:
Sep 27, 2005
Appl. No.:
11/236352
Inventors:
Daqing Hou - Boise ID, US
Gabriel Benmouyal - Boucherville, CA
Demetrios Tziouvaras - Vacaville CA, US
Assignee:
Schweitzer Engineering Laboratories, Inc. - Pullman WA
International Classification:
H02H 3/00
H02H 7/00
H02H 7/26
US Classification:
361 80, 361 79, 361 81, 361 83, 361 88, 361 62, 361 67
Abstract:
A system and method for accomplishing power swing blocking and unstable power swing tripping schemes during disturbances of electrical networks is disclosed. The disclosed system and method eliminates the requirement of stability studies. The no-setting scheme utilizes the swing center voltage of the electrical network to carry out its functions.

Method And Apparatus For Routing Data Streams Among Intelligent Electronic Devices

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US Patent:
20070067132, Mar 22, 2007
Filed:
Sep 19, 2006
Appl. No.:
11/533083
Inventors:
Demetrios Tziouvaras - Vacaville CA, US
Kenneth Fodero - Pullman WA, US
David Whitehead - Pullman WA, US
Tony Lee - Pullman WA, US
International Classification:
G01M 19/00
H02H 9/02
US Classification:
702122000, 307125000, 361093100
Abstract:
Provided is an intelligent electronic device for protection, monitoring, controlling, metering or automation of lines in an electrical power system is provided. The intelligent electronic device is adapted to communicate with a variety of other intelligent electronic devices. In one embodiment, the intelligent electronic device includes a communication configuration setting configured to allow communication with one of the other intelligent electronic devices. An input element is further provided in communication with the communication configuration setting, whereupon a signal from the input element selects a particular communication configuration setting therein, thereby allowing for communication with one of the other intelligent electronic devices.

Systems And Methods For Determining Trapped Transmission Line Charge

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US Patent:
20130234731, Sep 12, 2013
Filed:
Mar 9, 2012
Appl. No.:
13/416978
Inventors:
Demetrios A. Tziouvaras - Vacaville CA, US
International Classification:
G01R 27/26
US Classification:
324658
Abstract:
The present disclosure provides systems and methods for calculating the trapped charge on a de-energized phase line connected to a capacitance-coupled voltage transformer (CCVT). According to various embodiments, the current through an auxiliary capacitive assembly may be measured and the current through a primary capacitive assembly may be measured or derived. According to various embodiments, the current sensors may both be positioned at zero-voltage points, eliminating the need for high-voltage insulated current sensors. An intelligent electronic device (IED) may determine the voltage with respect to time on the phase line using the measured and/or derived currents through the capacitive assemblies. If the phase line is de-energized, the IED may calculate the trapped charge on the de-energized phase line. The IED may use the calculated trapped charge to facilitate an optimized re-energization of the phase line, thereby reducing undesirable transients during re-energization.

Systems And Methods For Determining Residual Flux In A Power Transformer

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US Patent:
20130238267, Sep 12, 2013
Filed:
Mar 9, 2012
Appl. No.:
13/416995
Inventors:
Demetrios A. Tziouvaras - Vacaville CA, US
International Classification:
G06F 19/00
US Classification:
702 65
Abstract:
The present disclosure provides systems and methods for calculating the flux in a core of an unloaded power transformer using current measurements taken from a capacitance-coupled voltage transformer (CCVT) attached to the same phase line as the power transformer. According to various embodiments, the current sensors may both be positioned at zero-voltage points in the CCVT, eliminating the need for high-voltage insulated current sensors. An intelligent electronic device (IED) may determine the magnetic flux within the core of the power transformer using the measured and/or derived currents through capacitive assemblies of the CCVT. The IED may calculate the residual flux in the power transformer when it is de-energized. The IED may use the calculated residual flux to facilitate an optimized re-energization of the power transformer, thereby reducing inrush currents during re-energization.
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Demetrios A Tziouvaras from Vacaville, CA, age ~71 Get Report