Application and development of a ceramics resistor for use as a neutral grounding resistor (NGR)

Shirakawa, Shingo; Owada, S.; Iimura, N.; Kurita, K.; Yamazaki, T.; Shindo, K.; Yamauchi, Yukihiko

doi:10.1109/61.4244

Cited by 11 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ceramic based resistors play a key role in a wide instrumentation for both miniaturized and high-power electronics. [1][2][3][4][5] Conventional components are characterized by linear I-V characteristics for resistors, or non-linear for varistors. The temperature evolution of the electrical behavior plays a crucial role through the positive temperature coefficient resistors (PTCR) which is required for high temperature applications.…”

Section: Introductionmentioning

confidence: 99%

Microstructural and electrical features of highly conducting indium co‐doped ZnO‐based ceramics

Chen

Tian

et al. 2022

J Am Ceram Soc.

View full text Add to dashboard Cite

In this work, we developed experimental approaches on indium co‐doped ZnO‐based ceramics from the synthesis to the characterizations and analysis of physical features in the aim to achieve the formation of highly conducting ceramics with controlled nonlinearity. Different doping molar ratios of indium were used and the synthesis of the ceramics was realized by the conventional solid‐state reaction method which was then followed by a sintering under air (A), nitrogen (N), or a mixture of nitrogen and carbon monoxide (NC) atmosphere with different reduction capabilities. The structure, morphology, electrical investigations, and the electronic transport analysis were conducted on the different ZnO co‐doped ceramics as functions of the indium incorporation and the used sintering atmosphere, A, N, or NC. Suitable indium doping of 0.3 mol% and the use of highly reducing sintering atmosphere (NC) ensure the formation of ZnO‐based ceramics with an electrical conductivity up to (103 S/cm) and a quasi‐linear behavior on the electrical characteristic I–V. We discussed the obtained performances by correlating the charge transport with the microstructure of the ceramics, the composition, and the structure of grain boundaries as well as the solubility of indium in the host ZnO ceramic grains.

show abstract

Section: Introductionmentioning

confidence: 99%

Microstructural and electrical features of highly conducting indium co‐doped ZnO‐based ceramics

Chen

Tian

et al. 2022

J Am Ceram Soc.

View full text Add to dashboard Cite

show abstract

“…ZnO-based linear resistance ceramics are newly developed electrical components, which have been attractive for various applications, owing to the advantages of easy manufacture, fine linear current-voltage characteristics, a smaller resistance temperature coefficient and a less fluctuation in resistivity [1][2][3][4]. They are fabricated by sintering ZnO powders with some amounts of additives such as Al 2 O 3 , MgO, NiO, TiO 2 , SiO 2 and others [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…The previous studies have demonstrated that the incorporation of the second insulating phases is an efficient way to modify the electrical properties of ZnO-based linear resistor, such as resistivity, nonlinear coefficient and resistance temperature coefficient [14]. It was reported that MgO could improve the resistance temperature coefficient, TiO 2 doping could improve the resistivity, Al 2 O 3 could control the grain growth and SiO 2 could improve the densification of the ZnO-based linear resistance ceramics [3]. Moreover, the nonlinear coefficient of MgO-doped ZnO-based linear resistor is about 1.25, which is higher than that of the sample without MgO doping [13] TiO 2 -doped ZnO-based linear resistor is still negative, which result in the current concentrate on one side of the resistor in a parallel connection circuit [3].…”

Section: Introductionmentioning

confidence: 99%

“…It was reported that MgO could improve the resistance temperature coefficient, TiO 2 doping could improve the resistivity, Al 2 O 3 could control the grain growth and SiO 2 could improve the densification of the ZnO-based linear resistance ceramics [3]. Moreover, the nonlinear coefficient of MgO-doped ZnO-based linear resistor is about 1.25, which is higher than that of the sample without MgO doping [13] TiO 2 -doped ZnO-based linear resistor is still negative, which result in the current concentrate on one side of the resistor in a parallel connection circuit [3]. As we know, doping alkali metal element may make the sample present a higher resistivity.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Li doping on microstructural and electrical properties of ZnO–MgO–Al₂O₃ linear resistance ceramics

2018

Can. J. Chem.

View full text Add to dashboard Cite

In this article, The ZnO-MgO-Al 2 O 3 linear resistance ceramics doped with Li 2 O have been prepared by the conventional ceramic method. The microstructure and the crystal characteristics were investigated by field emission scanning electron microscopy (FESEM) equipped with energy dispersive spectrometer (EDS) and X-ray diffraction (XRD) respectively. With the increasing of Li 2 O content, the grain growth of ZnO-based linear resistance ceramics was enhanced and the resistivity was also influenced significantly. The experimental result indicates that the doping of Li 2 O can reduces the nonlinear coefficient and improves the resistance temperature coefficient of the ZnO-based linear resistance ceramics obviously. The samples at the Li 2 O content of 8 mol% exhibit excellent electrical properties with the resistivity of 589.34 Ω cm and the resistance temperature coefficient of 0.8 * 10 -4 / ºC. Moreover, the nonlinear coefficient of the ZnO-based linear resistance ceramics decreases from 1.28 to 1.14 as the Li 2 O concentration ranging from 0 to 8.0 mol% and the relative density increases from 91.94% to 97.93%.

show abstract

“…Normally, metal grid resistor elements have been used for NGRs. The authors developed a new NGR [1] using ceramic resistor elements [2] for 22-to 154-kV power systems in the year 1985. This paper describes methods of monitoring ceramic-type NGRs using ceramic resistors.…”

Section: Introductionmentioning

confidence: 99%

Application and monitoring of SF₆ gas‐insulated NGR (neutral grounding resistor) using ceramic resistors

Shirakawa

Terakado

Miyake

et al. 2001

Electrical Engineering Japan

View full text Add to dashboard Cite

SUMMARYAbout 15 years have passed since ceramic-resistor NGRs (Neutral Grounding Resistors) were developed as new materials for power equipment. This paper describes the cumulative numbers of applications of ceramic-resistortype SF 6 gas-insulated NGRs and the typical construction of the 22-, 66-, and 110-kV NGRs, and also describes monitoring methods for measuring the residual leakage current of the 110-kV NGR that depend on the neutral unbalance voltage of power transformers, and the use of thermal detection devices for the ceramic resistors of the 66-kV NGRs. © 2001 Scripta Technica, Electr Eng Jpn, 137(4): 3237, 2001

show abstract

Application and development of a ceramics resistor for use as a neutral grounding resistor (NGR)

Cited by 11 publications

References 0 publications

Microstructural and electrical features of highly conducting indium co‐doped ZnO‐based ceramics

Microstructural and electrical features of highly conducting indium co‐doped ZnO‐based ceramics

Effects of Li doping on microstructural and electrical properties of ZnO–MgO–Al₂O₃ linear resistance ceramics

Application and monitoring of SF₆ gas‐insulated NGR (neutral grounding resistor) using ceramic resistors

Contact Info

Product

Resources

About

Application and development of a ceramics resistor for use as a neutral grounding resistor (NGR)

Cited by 11 publications

References 0 publications

Microstructural and electrical features of highly conducting indium co‐doped ZnO‐based ceramics

Microstructural and electrical features of highly conducting indium co‐doped ZnO‐based ceramics

Effects of Li doping on microstructural and electrical properties of ZnO–MgO–Al2O3 linear resistance ceramics

Application and monitoring of SF6 gas‐insulated NGR (neutral grounding resistor) using ceramic resistors

Contact Info

Product

Resources

About

Effects of Li doping on microstructural and electrical properties of ZnO–MgO–Al₂O₃ linear resistance ceramics

Application and monitoring of SF₆ gas‐insulated NGR (neutral grounding resistor) using ceramic resistors