Resolving Current Transformer Partial Saturation Problem: An Analytical Approach to Design the Flux Equalizing Winding

Torkamani, Abbas; Davarpanah, Mahdi; Sanaye‐Pasand, M.

doi:10.1109/tpwrd.2022.3145469

Cited by 4 publications

(5 citation statements)

References 15 publications

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“…6 Three RCTs were from Iran, and one each from South Africa, China, and the United Kingdom. Of the six RCTs, five had full text, 2 5 6 7 8 one was an unpublished trial, 6 and one was an abstract. 4 None of the RCTs were in a clinical trials registry.…”

Section: Resultsmentioning

confidence: 99%

“…Length of third stage of labor and length of labor overall were reported in one RCT trial each and significantly lower in the waterbirth group ( p = 0.02 and p = 0.04, respectively) ( Table 5 ). Mode of delivery did not differ significantly between the groups ( Table 6 ); one study 5 was excluded from this analysis as it excluded patients requiring cesarean. Method of fetal monitoring was not described in several trials.…”

Section: Resultsmentioning

confidence: 99%

“…Method of fetal monitoring was not described in several trials. 3 4 8 Some described monitoring fetal well-being throughout labor, 5 every half hour, 6 or every 15 minutes. 7…”

Section: Resultsmentioning

confidence: 99%

“…Potential adverse events include difficulty estimating and treating hemorrhage, maternal infection, perineal lacerations, newborn infection, and aspiration or need for respiratory support. Randomized controlled trials (RCTs) exploring waterbirth and its effects have been published from countries including Iran, 3 4 5 South Africa, 6 China, 7 the United Kingdom, 8 and Australia. 9 These trials provide evidence for benefits such as pain management.…”

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confidence: 99%

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Waterbirth: A Systematic Review and Meta-Analysis

Edwards¹,

Angarita

Talasila

et al. 2023

Am J Perinatol

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Despite patient interest, there is little evidence regarding waterbirth. This review sought to compare maternal and perinatal outcomes in waterbirth, compared with landbirth. This search was conducted using MEDLINE, Google Scholar, Web of Sciences, Scopus, ClinicalTrial.gov, OVID, and Cochrane Library from inception to November 15, 2021, with no language or geographic restrictions. Review was registered with PROSPERO under registration number: CRD42021288576. Selection criteria included randomized controlled trials of women with singleton cephalic gestations at ≥36 weeks comparing waterbirth to landbirth. The primary outcome was a perinatal composite outcome. Secondary outcomes included maternal and individual perinatal outcomes. Summary measures were reported as relative risk or mean difference with 95% confidence intervals using random effects model of DerSimonian and Laird. I 2 (Higgins I 2) > 0% was used to identify heterogeneity. Six trials including 706 patients were included. When reported, all patients were ≥ 37 weeks' gestation. Labor augmentation (41.7 vs. 84.7%, p < 0.0001) and neuraxial anesthesia (10.5 vs. 72.4%, p < 0.0001) were less common with waterbirth. Estimated blood loss, postpartum hemorrhage, perineal laceration, episiotomy, mode of delivery, and perinatal outcomes did not differ between groups. Chorioamnionitis and endometritis were not reported by any trial. Maternal satisfaction was higher (p = 0.01) and pain scores lower (p = 0.003) with waterbirth. Length of first stage (p < 0.00001), third stage (p = 0.02), and labor (p = 0.04) were shorter with waterbirth. The composite perinatal outcome could not be calculated due to lack of individual patient data. Compared with landbirth, waterbirth was associated with lower rates of neuraxial anesthesia and lower pain scores, with improved maternal satisfaction. Key Points

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…Method of fetal monitoring was not described in several trials. 3 4 8 Some described monitoring fetal well-being throughout labor, 5 every half hour, 6 or every 15 minutes. 7…”

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Waterbirth: A Systematic Review and Meta-Analysis

Edwards¹,

Angarita

Talasila

et al. 2023

Am J Perinatol

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“…Tianwei Gao et al [25] used the finite element method to simulate and evaluate the CT in order to address the issues of magnetic core saturation in the CT's online energy supply and the challenge of measuring the output power of the magnetic core. A. Torkamani et al [26] analyzed partial saturation occurrence in a core balance current transformer using the finite element method. The finite element simulation model offers significant advantages over the numerical model regarding spatial resolution, material nonlinearity, boundary condition processing, visualization, and post-processing.…”

Section: Introductionmentioning

confidence: 99%

Parameter Design of a Self-Generated Power Current Transformer of an Intelligent Miniature Circuit Breaker Based on COMSOL

Wang,

Chang,

Han

et al. 2024

Electronics

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With the deep penetration of renewable energy and power electronic equipment, the overcurrent protection of an intelligent miniature circuit breaker faces new challenges. The electronic controller of an intelligent miniature circuit breaker is typically powered by the bus current rather than the phase voltage to ensure a robust overcurrent protection response under all conditions, including severe short-circuit faults. So, the performance of the current transformer serving as an energy harvesting unit and the corresponding direct current to direct current convention circuit is one of the critical issues due to the limited volume of an intelligent miniature circuit breaker. In this research, a finite element model of a current transformer for an intelligent miniature circuit breaker is constructed by COMSOL to evaluate the impact of the core material, the core size, and the number of coil turns on the energy harvesting capability of the current transformer. Meanwhile, the relationship between the output of the power supply and its design parameters is investigated by circuit simulation. As a result, a novel type of current transformer is proposed based on well-designed parameters. Finally, experimental tests have been conducted to verify the hysteresis characteristics, output characteristics, and energy harvesting effect. The results demonstrate that the hysteresis properties of the transformer align with the simulation results. The power supply can work with a minimum current of 8 amperes, which is 23.08% better than before.

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Design of Heart-Shaped Current Sensor Based on Incomplete Magnetic Cancellation

Li,

Tang,

et al. 2024

IEEE Trans. Instrum. Meas.

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Resolving Current Transformer Partial Saturation Problem: An Analytical Approach to Design the Flux Equalizing Winding

Cited by 4 publications

References 15 publications

Waterbirth: A Systematic Review and Meta-Analysis

Waterbirth: A Systematic Review and Meta-Analysis

Parameter Design of a Self-Generated Power Current Transformer of an Intelligent Miniature Circuit Breaker Based on COMSOL

Design of Heart-Shaped Current Sensor Based on Incomplete Magnetic Cancellation

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