Publicerad: 2007-12-21
ISBN:
ISSN: 1650-3686 (tryckt), 1650-3740 (online)
The significance of overload in power system has increased substantially due to of consumption and ambient temperature rise. An important consideration when evaluating the impact of overload is their on power system ambient tem-and load. Transformers are major components in power systems. The increase useful lifetime and hence abnormal temperature rise. Existing standards give a procedure to determine the capability of an existing transformers subject to overload problem and ambient temperature rise based on conservative assumptions .in addition; the temperature oil rise of power transformer due to overloading and ambient temperature are estimated based on power and cooling system; and the average daily or monthly temperatures to which a transformer would be subjected while in service. it is the purpose of this research of this effort to quantify the decreased life time due to overloading and the corresponding temperature rise in transformers. This is accomplished using a 2-D FEMLAB Model adapted for cooling simulation in power transformers. (20-24).
[1] –V. M. Montsinger ;" loading transformer by temperature"; AIEE Trans;Vo1.49;April 1930;pp293-297.
[2]–E .T. Norris;"Loading of power transformer"; Proc; IEE; Vol. 114; no.2; February 1967; pp 228-232.
[3] –M .G. Carrothers; E. T. Morris;"Thermal rating oftransformers "; proc; IEEE; Vol. 116; no.9; September 1961; pp 1564-1570.
[4]-B.D. Lahoti; D. E. Flowers;" Evaluation of transformer loading above nameplate rating "; IEEE trans. Vol . PAS-100; no.4; April 1981; pp 1989 -1998.
[5]-J. Nejedly ; "The loading of Transformer Unit in Power Plants and Network with Regard to Ambient Temperature "; CIRGE 1978 Session; Paper 12-01
[6]-B. J. Conway; D.W; MeMullen; A. J. Peat;J. M. Scofield;" Loading of Substation Electrical Equipment With Emphasis on Thermal Capability Part I; principles" ;IEEE Trans.; Vol. PAS-98 ;no.4; July/August 1979;pp 1394-1402.
[7]-I. S. Benko. D. O. Craghead; P. Q. Nelson;" Loading of Substation Electrical Equipment With Emphasis on Thermal Capability Part II Application"; IEEE Trans
[8]-B. J. Conway; D.W; MeMullen; A. J. Peat;J. M.Scofield;" Loading of Substation Electrical Equipment With Emphasis on Thermal Capability Part I; principles" ;IEEE Trans.; Vol. PAS-98 ;no.4; July/August 1979;pp 1394-1402.
[9]-I. S. Benko. D. O. Craghead; P. Q. Nelson;" Loadingof Substation Electrical Equipment With Emphasis on Thermal Capability Part II Application"; IEEE Trans.Jacques Aubin Gesyprotec; Pointe – clarre; (Quebec); Canada.
[10]– Transformer (BHARA HEAVY Electrical LIMITED)
[11]- Heat sink auxiliary transformer cooler (Unifin) http://www.unifin.com/heatsink.htm
[12]- IEC publication 76-1" power transformer; part: 1 General"; Second Ed...1993
[13]- IEC publication 76-2 "power transformer part2: temperature Rise " Second Ed..1993
[14]- D.HShroff and A.W. Stan net;"A Review ofpaper Aging in power transformers" IEE proceeding Vol.132; pt.c; No.6 Nov.1985; pp 312-319
[15]- K.Karsai; D.Kerenyi and L.Kiss; "large power transformers" book; Elsevier. Amsterdam; second Ed.1995
[16]- C.A. bozzini; " transformer Aging Diagnosis by Means of Measurements of theDegree of Polymerization Results of new Experiments CIGRE paper 12-08 1968
[17]- IEC publication 354 "Guide to loading of oilimmersed power transformer 1991; BS; 7735 1994
[18]- IRANTRANSFO company technical Documents.
[19]- MAZREC. Dispatching centers Technical reports . Website: www. Mazrec .co .ir
[20]- Golestan Province Dispatching center Documents.
[21] - MAZREC. Transmission Deputy. System Studies Affair.
[22]- VDE 0536/30"Belastbarkeit Von" oil Transformers" .
[23]- book" Transformer" Bharatheavy Electrical Limited Bhopal" New Delhi: tata McGraw-hill 2003"
[24]-"FAMLAB 3.1i" with MATLAB software consol Metaphysics 3.2 modeling guide .
[25] – "Evaluation of transformer overloading capability "Sarat C. Tripathy*;y and Erkki Lakervi Department of Electrical and Communication Engineering; Helsinki University of Technology; P.O. Box 3000; 02015 Hut; EUROPEAN TRANSACTIONS ON ELECTRICAL POWER Euro. Trans. Electr. Power 2005; 15: 455–464 Published online 11 April 2005 in Wiley Inter Science www.interscience.wiley.com). DOI: 10.1002/etep.59
[26]- "Economic Benefit and Risk Evaluation of Power Transformer Overloading "Robert Ch6nier and Jacques Aubin; GE Syprotec; Pointe-Claire; (Qu4bec); Canada
[27] – "Power transformer overloading" A. Kalas D. ’Tsanakas University of I’atras Power Systems 1;aboratory Patras. Giecce A. Sferides Public Power Corpoiatiori Department lor (tic Maintenance of Trarismissioii Lines tind Substations Thessaloniki. Greecc
[28] – "Assessment of Overload Capacity of Power Transformers by On-line Monitoring Systems"S. Tenbohlen; T. Stirl ALSTOM Schorch Transformatoren GmbH; Rheinstr.73; 41065 Monchengladbach; Germany transforrner.monitorin g@tde.alstom.com
[29] L. W. Pierce; “Transformer design and application consideration for nonsinusoidal Load currents;” IEEE Trans. on Industry Applications; vol.32; no.3 1996; pp.633-645;
[30] S. A. Stigant and A. C. Franklin; The J & P Transformer Book. 10th ed. New York: Wiley; 1973
[31] J. Lammeraner and M. Stafl; Eddy Currents; London: Iliffe; 1966
[32] R. L. Stool; The Analysis of Eddy Currents. Clarendon; 1974;
[33] O. W. Anderson; “Transformer leakage flux program based on finite element Method;” IEEE Trans Power Apparatus and systems; vol. PAS-92; 1973; pp.682- 689.
[34] D. Pavlik; D. C. Johnson; and R. S. Girgis; “Calculation and reduction of stray And eddy losses in core form transformers using a highly accurate finite element modelling technique;” IEEE Trans Power Delivery; vol. 8; no. 1 Jan. 1993; Pp.239-245; References 114
[35] "EVALUATION OF POWER SYSTEMHARMONIC EFFECTS ON TRANSFORMERS"Hot Spot Calculation and Loss of Life Estimation Doctoral Dissertation Helsinki University of Technology Department of Electrical and Communications Engineering Power Systems and High Voltage Engineering Asaad A. Elmoudi TKK Dissertations 24 Espoo 2006
[36] IEC 354 Standard Publications: 1991; Loading Guide for Oil-Immersed Power Transformers;
[37] IEEE standard C57.91-1995; Loading Guide for Mineral-Oil-Immersed Immersed Transformers;
[38] Working Group 12-09; “Heat Run Test For Power Transformers” Electra; no.129; pp.37-39;
