A Low-Power Setup Proposal for Power Transformer Loading Tests

Galvão, Thiago Moura; Simonetti, Domingos Sávio Lyrio

doi:10.3390/en12214133

Cited by 1 publication

(2 citation statements)

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“…The application of AELs are specially of great interest in routine tests on power transformers [13]- [15]. In the particular study of transformers, some typical indirect tests such as shortcircuit and open circuit [16] neglect, at some level, the equipment's real behavior, since it is not tested simultaneously as a whole (both current-wise and voltage-wise) under rated conditions [17].…”

Section: Introductionmentioning

confidence: 99%

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Regenerative Active Electronic Load With Current, Voltage and Frequency Control for Power Transformer Testing

Rezende¹,

Almeida²,

Ferreira³

et al. 2021

IEEE Access

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The long duration test of electrical equipment is an important tool for users and manufacturers to determine precise information as, for example, equipment operational limits, lifespan, thermal behavior, etc. Although useful, these long duration tests are usually conducted using passive elements such as in the burn-in test, consuming a great amount of energy and with limited flexibility to emulate different loading profiles (e.g., current and voltage levels, harmonics content, etc.). In this context, to perform tests in power transformer emulating its real operation conditions can be a difficult task, since the standards procedures do not emulate the loading levels and the burn-in test consumes a high quantity of energy. Moreover, in distribution networks, the transformers are submitted to an increasing level of nonlinear voltage and current. Thus, it is important to test them under these conditions. The use of active electronic loads (AEL) is an alternative to solve these problems since the device structure can have regenerative proprieties and its control can emulate different types of load. This paper presents an AEL to perform tests in power transformers with low energy consumption that is capable of imposing controlled voltage and current (frequency, level, and harmonic distortion) to the transformer under test. The proposed methodology is validated by experimental results of a 50 kVA prototype.INDEX TERMS Active electronic load, load emulator, power transformer test, resonant control, voltage and frequency control.

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Section: Introductionmentioning

confidence: 99%

“…Therefore, it is very important to test transformers under distorted voltage and current conditions. None of the AEL's presented in [13]- [15], [18] are able to emulate these operational conditions, since they do not have voltage and frequency control capabilities.…”

Section: Introductionmentioning

confidence: 99%