Transformer - Wikipedia
31.05.2007· Stray voltage is caused by primary and/or secondary return current, and power system induced currents, as these currents flow through the impedance of the intended return pathway, its parallel conductive pathways, and conductive loops in close proximity to the power system. Stray voltage is not related to power system faults, and is generally not considered hazardous."Leakage inductance - Wikipedia,Leakage inductance has the useful effect of limiting the current flows in a transformer (and load) without itself dissipating power (excepting the usual non-ideal transformer losses). Transformers are generally designed to have a specific value of leakage inductance such that the leakage reactance created by this inductance is a specific value at the desired frequency of operation. In this case,Transformer types - Wikipedia,A leakage transformer, also called a stray-field transformer, has a significantly higher leakage inductance than other transformers, sometimes increased by a magnetic bypass or shunt in its core between primary and secondary, which is sometimes adjustable with a set screw.Parasitic capacitance - Wikipedia,Parasitic capacitance, or stray capacitance is an unavoidable and usually unwanted capacitance that exists between the parts of an electronic component or circuit simply because of their proximity to each other. When two electrical conductors at different voltages are close together, the electric field between them causes electric charge to be stored on them; this effect is capacitance. All practicalWhat is a stray loss? - Quora,The stray load losses occur due to the leakage fluxes of the transformer. These leakage fluxes link the metallic structural parts, tank etc. and produce eddy current losses in them. Thus they take place ’all round’ the transformer instead of a definite place, hence the name ’stray’.Calculating stray losses in power transformers using,,century to determine the stray losses on power transformers [l]. For the majority of standard designs these have served as good gauges of eddy induced loss but for designs of special transformers or units with very tight specification tolerances these have often proved to be inadequate. This has often
Stray voltage - Wikipedia
Stray voltage is the occurrence of electrical potential between two objects that ideally should not have any voltage difference between them. Small voltages often exist between two grounded objects in separate locations, due to normal current flow in the power system. Large voltages can appear on the enclosures of electrical equipment due to a fault in the electrical power system, such as a,Transformer types - Wikipedia,A leakage transformer, also called a stray-field transformer,, In the same way that transformers create high voltage power transmission circuits that minimize transmission losses, loudspeaker transformers can power many individual loudspeakers from a single audio circuit operated at higher than normal loudspeaker voltages. This application is common in public addressLeakage inductance - Wikipedia,Leakage inductance has the useful effect of limiting the current flows in a transformer (and load) without itself dissipating power (excepting the usual non-ideal transformer losses). Transformers are generally designed to have a specific value of leakage inductance such that the leakage reactance created by this inductance is a specific value at the desired frequency of operation. In this,Parasitic capacitance - Wikipedia,Parasitic capacitance, or stray capacitance is an unavoidable and usually unwanted capacitance that exists between the parts of an electronic component or circuit simply because of their proximity to each other. When two electrical conductors at different voltages are close together, the electric field between them causes electric charge to be stored on them; this effect is capacitance.Stray losses on transformers - IEEE Journals & Magazine,Stray losses on transformers Abstract: The object of this paper is to obtain a convenient method of evaluating the actual losses in the copper of a transformer and in figuring the regulation. The effects of various factors on the copper loss of transformers are discussed. It is pointed out that they are, as a rule, negligible in well designed transformers. It is shown theoretically that the,Stray losses in power transformer tank walls and,,08.09.2010· Stray losses in power transformer tank walls and construction parts Abstract: The article discusses the eddy current losses generated in a transformer tank walls and other electrically conductive construction parts. The losses are related to the magnetic leakage fields. A time harmonic 3D finite element method is used to compute the magnetic leakage field in the case of nominal load
Stray Losses Computation in Power Transformer - IEEE,
Abstract: Stray losses of three-phase power transformer are predicted using 3D-FEM. The computation is made under harmonic steady state load condition treating the transformer core magnetizing characteristic as non-linear. Various kinds of methods for estimating stray losses due to leakage magnetic field are discussed. In this paper, the eddy current losses in the clamp plates andPREDICTION OF STRAY LOSSES IN POWER TRANSFORMER,PREDICTION OF STRAY LOSSES IN POWER TRANSFORMER L. Susnjic1), Z. Haznadar2) and Z. Valkovic3) 1) Faculty of E ngier Vukovarska 58, 51000 Rijeka, Croatia, e-mail: [email protected] 2) F ac ul ty of E er ingd C mp Unska 3, 10000 Zagreb, Croatia, e-mail: [email protected] 3) P olyt echni f Zagr b Konavoska 2, 10000 Zagreb, Croatia, e-mail: [email protected] Abstract –Reduction of Stray Loss in Power Transformers Using,,the effect of the lobe-type magnetic shielding on the stray losses of power transformer using the 3-D FEM analysis is studied. In [10], a numerical method based on network approach is presented and it is used in [21] to model the effect of magnetic shunts on transformer stray flux. Many methods are proposed for nonlinear laminated steel modeling and calculation of its stray loss [26]–[36,Stray Load Loss and Mechanical Loss in an Electrical,,24.11.2016· The Stray Load loss is proportional to the square of the Load Current. But it shall be kept in mind that this is only an approximation as Stray Load loss cannot be calculated accurately. By convention, in DC Machine Stray Load loss is normally taken as 1% of the rated output for rating of DC Machine above 150 kW. For Synchronous and Induction,Stray losses in power transformer tank walls and,,08.09.2010· Stray losses in power transformer tank walls and construction parts Abstract: The article discusses the eddy current losses generated in a transformer tank walls and other electrically conductive construction parts. The losses are related to the magnetic leakage fields. A time harmonic 3D finite element method is used to compute the magnetic leakage field in the case of nominal loadStray Losses Computation in Power Transformer - IEEE,,Abstract: Stray losses of three-phase power transformer are predicted using 3D-FEM. The computation is made under harmonic steady state load condition treating the transformer core magnetizing characteristic as non-linear. Various kinds of methods for estimating stray losses due to leakage magnetic field are discussed. In this paper, the eddy current losses in the clamp plates and
MK0500062 Some Aspects of Srray Losses in Large Power,
Some Aspects of Srray Losses in Large Power Transformers Zvonimir VALKOVIC Institut Koncar, Bastijanova bb, 10002 Zagreb, Croatia Abstract. The paper presents some results of the investigation of stray losses in power transformers that are caused by high-current loops. The investigation was focused on: a) additional losses in tank cover around high-current bushings and the way of their,PREDICTION OF STRAY LOSSES IN POWER TRANSFORMER,PREDICTION OF STRAY LOSSES IN POWER TRANSFORMER L. Susnjic1), Z. Haznadar2) and Z. Valkovic3) 1) Faculty of E ngier Vukovarska 58, 51000 Rijeka, Croatia, e-mail: [email protected] 2) F ac ul ty of E er ingd C mp Unska 3, 10000 Zagreb, Croatia, e-mail: [email protected] 3) P olyt echni f Zagr b Konavoska 2, 10000 Zagreb, Croatia, e-mail: [email protected] Abstract –Mathematical Calculation of Stray Losses in Transformer,,18.01.2021· Keywords: power transformer; stray losses; analytical methods; finite element method 1. Introduction Nowadays, electric power systems (EPS) are constantly changing. The use of new technologies such as smart-grids, micro-grids and renewable energy systems demand high flexibility, performance and efficiency in the EPS. The transformer is a fundamental component in theseTypes of Losses in Transformer | Electricalvoice,23.03.2018· Classification of Transformer losses Contents show Classification of Transformer losses Iron or Core Losses in Transformer Copper losses or Ohmic losses Stray load losses Dielectric losses A transformer is a static device, hence mechanical losses (like windage or friction losses) are absent in it. There are mainly two types of losses in the transformer.Stray Load Loss and Mechanical Loss in an Electrical,,24.11.2016· The Stray Load loss is proportional to the square of the Load Current. But it shall be kept in mind that this is only an approximation as Stray Load loss cannot be calculated accurately. By convention, in DC Machine Stray Load loss is normally taken as 1% of the rated output for rating of DC Machine above 150 kW. For Synchronous and Induction,3D Finite Element Analysis of the Stray Loss in Power,,stray loss problem in large power transformer by using 3-D nonlinear time harmonic analysis. Detailed calcula-tion and analysis was proceeded in order to determine the concentration of stray loss in transformer structure parts, and magnetic shields were used to reduce stray loss and prevent local overheating. 2. 3D Calculation Model and Calculation Method . The 3-D finite element model in this,
Reduction of Stray Losses in Flange–Bolt Regions of Large,
More than 20% of the total load loss is the stray loss in power transformer structural components [15]. The biggest part of stray loss takes place in the transformer tank. As the transformer ratings increase, the stray loss problem becomes increasingly significant. During the last few decades, the ratings of power transformers have been steadily growing. Stray losses can be very high, which,Loss prophet - ABB,Predicting stray losses in power transformers and optimization of tank shielding using FEM Loss prophet. 52 ABB review 4|16 Electromagnetic simulations FEM is a sophisticated tool widely used to solve engineering problems. It is uti-lized in new product development as well as in existing product refinement to verify a proposed design and adapt it to the client’s specifications [5]. The,,,,,
