Evaluation of Methodology for Lightning Impulse Voltage Distribution over High-Voltage Windings of Inductive Voltage Transformers

Trkulja, Bojan; Drandić, Ana; Milardić, Viktor; Žiger, Igor

doi:10.3390/en14165144

Cited by 5 publications

(4 citation statements)

References 32 publications

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“…The study of the transmission characteristics of the transformer is of great importance to the proposed voltage measurement method. The working principle of CVT is that it is equivalent to dividing the primary voltage through a capacitive voltage divider and then connecting it to a PT, which is more stable and has a smaller error [4][5]. The structure of CVT can be divided into two major parts: capacitor divider and electromagnetic unit, capacitor divider consists of high voltage capacitor L1 and medium voltage capacitor L2 in series, electromagnetic unit consists of intermediate transformer Z, compensation reactor Rc and its protection arrester R1, etc.…”

Section: Identifying the Transfer Characteristics Of Capacitive Volta...mentioning

confidence: 99%

Research on digital twin-based capacitive voltage transformer operating condition monitoring method

Zhang¹,

Yang²,

Wang³

et al. 2023

Second Guangdong-Hong Kong-Macao Greater Bay Area Artificial Intelligence and Big Data Forum (AIBDF 2022)

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The capacitive voltage transformer operating condition monitoring method has the problem of excessive error, in order to design a digital twin-based capacitive voltage transformer operating condition monitoring method. The capacitive voltage transformer transmission characteristics are identified, the harmonic measurement signal is obtained by using a series-connected voltage divider, an equivalent circuit model is constructed based on digital twin, the capacitive transformer fault gas data is extracted and uploaded to the digital twin database, and the operating condition monitoring method is designed. The results show that the mean error value of this designed capacitive voltage transformer operating condition monitoring method is 24.334%, indicating that the capacitive voltage transformer operating condition monitoring method in the paper is more effective after combining digital twin technology.

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Section: Identifying the Transfer Characteristics Of Capacitive Volta...mentioning

confidence: 99%

Research on digital twin-based capacitive voltage transformer operating condition monitoring method

Zhang¹,

Yang²,

Wang³

et al. 2023

Second Guangdong-Hong Kong-Macao Greater Bay Area Artificial Intelligence and Big Data Forum (AIBDF 2022)

View full text Add to dashboard Cite

show abstract

“…One of the most important tests to consider is the LI test, which analyzes the transformers' capacity to hold transient overvoltage. Because of the disastrous impact that transient overvoltage can have on transformers-for example, an insulation breakdown-it is helpful and critical to have a precise simulation of the LI test available alongside the transformer design process [46,47]. This test is carried out with negative polarity standard lightning impulses.…”

Section: Transformer Dielectric Testsmentioning

confidence: 99%

Eco-Friendly Ester Fluid for Power Transformers versus Mineral Oil: Design Considerations

2022

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Mineral oil has long been used as an adequate coolant and dielectric medium in power transformer design. However, it is flammable and environmentally risky as it may be leaked or spilled. Therefore, ester fluids, which have been increasingly used in the last two decades, look promising as an ideal dielectric option. This research aims to better understand how using ester fluid insulation in power transformers impacts their physical and electrical dimensions, including their load-losses, impedance, masses, and equipment dimensions. Three case studies were carried out in a Portuguese electrical equipment manufacturer’s facility, with varying electrical parameters and physical properties of the mineral oil and ester-filled power transformers. The main results enhanced the known good electrical behavior of ester fluids, namely creating a lower electric field around winding wedges, yet the use of ester fluids led to higher load-losses, larger masses, additional radiators and, consequently, higher manufacturing costs. Nevertheless, the contribution of ester-filled power transformers to the improved environmental safety (reducing spillage and fire risks), among other advantages, makes ester fluids a truly eco-friendly option for power transformer design.

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“…Many scholars have therefore studied the problem of turn-to-turn short-circuit faults in dry-type voltage transformers. The authors of [6,7] employed the lightning shock test to diagnose the turn-to-turn insulation of voltage transformers. The authors of [8] used the partial discharge technique to test the insulation of solid-insulated electromagnetic voltage transformers.…”

Section: Introductionmentioning

confidence: 99%

Detection of Interturn Short-Circuit Faults in Dry-Type Voltage Transformers Using the Pulse Voltage Method

Nie,

Wang,

Wang

et al. 2023

Energies

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This article investigates the application of the pulse voltage method for detecting interturn short-circuit faults in the high-voltage windings of dry-type voltage transformers. We determined the characterization parameters of the high-voltage windings of dry-type voltage transformers and trends in the variation of the characterization parameters with frequency in the presence and absence of faults. The viability of using the pulse voltage method for the detection of interturn short-circuit faults in dry-type voltage transformers was analyzed. A pulse voltage test platform was designed to analyze the response voltage waveforms using pulse-oscillating voltage experiments on transformers with various short-circuit faults. The results demonstrate that during a turn-to-turn short circuit, the equivalent resistance and inductance of a high-voltage winding are significantly lowered. When employing the pulse voltage method to investigate interturn short-circuit faults, tiny inductors are connected in parallel to produce an oscillating voltage waveform that is more uniform. Upon incurring a short circuit between turns, the pulse’s oscillating voltage frequency increases. The greater the number of turns in the short-circuit fault is, the more significant the effect of the test.

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Evaluation of Methodology for Lightning Impulse Voltage Distribution over High-Voltage Windings of Inductive Voltage Transformers

Cited by 5 publications

References 32 publications

Research on digital twin-based capacitive voltage transformer operating condition monitoring method

Research on digital twin-based capacitive voltage transformer operating condition monitoring method

Eco-Friendly Ester Fluid for Power Transformers versus Mineral Oil: Design Considerations

Detection of Interturn Short-Circuit Faults in Dry-Type Voltage Transformers Using the Pulse Voltage Method

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