Power transformers
Condition monitoring and diagnostics of power transformers
... The electricity market has been, in general, dominated by national or regional monopolies. During the last years, this picture has changed drastically, particularly in Europe and in the USA. The trend towards free ...
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Design parameter based method of partial discharge detection and location in power transformers
... Acoustic Emission (AE) PD detection method is based on the fact that partial discharges produce acoustic waves in a frequency range up to 150 kHz within the transformer tank [1]. Special piezo-electric sensors are placed ...
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Intermittent turn-to-turn winding faults diagnosis in power transformers by the on-load exciting current Park's Vector Approach
... Abstract- This paper presents the application of the on-load exciting current Park's Vector Approach for diagnosing perma- nent and intermittent turn-to-turn winding faults in operating power transformers. ...
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Application of an artificial neural network in the use of properties as a low cost proxy of power transformers DGA data
... in power transformers, which is characterized by a non-linear dynamic ...a power transformer can be inferred by analysis of physicochemical and chromatographic (DGA – Dissolved Gas Analysis) profiles ...
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Power transformers winding fault diagnosis by the on-load exciting current extended Park's vector approach
... replacement [3]-[5]. Because of this economic incentive, preventive test and condition monitoring are benefit to predict incipient fault conditions, and to schedule outage, maintenance and retirement of the ...
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Software System for Finding the Incipient Faults in Power Transformers
... Power transformers are used to transform voltage from one to anothervoltage level and are an integral component of a power ...of transformers failing whilst in service, creating significant ...
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Modelling and simulation of three-phase power transformers
... for power transform- ers was ...of power transformers, presented in [2], stresses the need for the development of new diagnos- tic techniques, which can be applied without taking trans- formers out ...
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Incipient turn-to-turn winding fault diagnosis of power transformers by the on-load exciting current Extended Park`s Vector Approach
... results, presented in [10], concerning the use of the supply current Park's Vector Approach, have also demonstrated the effectiveness of this technique for diagnosing the occurrence of inter-turn insulation faults in the ...
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The numerical method of inverse Laplace transform for calculation of overvoltages in power transformers and test results
... Transformer is one of the most common components in the power systems, but also the component that is extremely difficult to model accurately. Modeling the transformer windings is more complex than modeling the ...
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Power transformers behavior under the occurrence of inrush currents and turn-to-turn winding insulation faults
... The most difficult transformer winding fault for which to provide protection is the fault that initially involves only one turn [3]. A short-circuit between turns can start with point contact resulting from mechanical ...
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Application of Park's power components to the differential protection of three-phase transformers
... Power transformers are expensive components with high strategic importance in the power system ...accidental power transformer outage is often counted in million dollars for output loss only, ...
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Online Monitoring of Transformers with Digital Fault Recorder Signals: Case Studies from Indonesian System
... OWER transformers are one of the most important and expensive equipment of a power ...whole power system. Online monitoring and diagnosing power transformer incipient fault conditions is ...
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Sba Controle & Automação vol.16 número3
... For power transformers, this prac- tice produces significant errors because, in the construction of the core, the sheets are cut, having insertion of unknown gap ...rent transformers, which present ...
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Three-phase, three-limb, steady-state transformer model
... for power transformers was ...voltage power and distribution trans- formers will be sold and purchased throughout the world ...of power transformers, presented in [3], stresses the need ...
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Distribution transformers modeling with angular displacement: actual values and per unit analysis
... A methodology that allows, with minimal data (one short- circuit test), modeling three-phase distribution and power transformers based on a single-phase transformers bank was presented. Proposed ...
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Estudo e ensaios experimentais destinados à caracterização do comportamento dinâmico de estruturas mecânicas de transformadores de potência quando sujeitos a curto-circuito
... of Power Transformers is based on empirical knowledge and Elastic Theory of Mechanics of ...type Power Transformer, this paper shows the results of a nonlinear dynamic simulation to study the ...
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RF CMOS Transmitter Front-end with Output Power Combiner
... The first simulation was done with the PA in a standalone configuration, in this test pre-layout components were used and the PA drive was done with an ideal square wave with a voltage between −0.4V and 0.4V . The result ...
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Religious Soft Power as Accountability Mechanism for Power in World Politics
... Although RNGOs are subject to the same laws as secular civil society, they differ from INGOs in that they claim a moral authority focused on ends rather than on means that is unavailable to secular nonprofits (Heferen, ...
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Aplicação da transformada Wavelet na análise da qualidade de energia em fornos elétricos...
... Method Based on the Wavelet Transform for Power Quality Analysis.. Power Delivery, vol.[r] ...
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Power System Stability Enhancement Using Unified Power Flow Controller
... This study presents the mathematical model of power system equipped with a UPFC. The presented mathematical model is applied to design control strategy of a UPFC. The simulation results are tested on a Single ...
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