Effect of Stress Grading Tape Conductivity on the Electric Field Distribution in Stress Grading System of an Inverter-Fed Rotating Machine

Naeini, Alireza; Cherney, E.A.; Jayaram, S.

doi:10.1109/eic.2018.8481129

Cited by 7 publications

(10 citation statements)

References 8 publications

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“…Nonlinear resistance tapes are the universal choice for stress-grading motor and generator coils [ 21 ]. Evaluating system performance by simulating the electric field and potential distributions in the overhang region showed that a highly conductive stress-grading tape reduces the maximum electric field at this region [ 40 ]. Usually, the main insulation is provided with outer corona protection applied by multilayer semiconducting paints or wrapping tapes [ 28 ].…”

Section: Electric-field Grading In Hv Applicationsmentioning

confidence: 99%

“…Naeini et al [ 40 ] simulated the effect of tape conductivity on the electric field distribution in a stress-grading system of an inverter-fed rotating machine. The main parts of this system consisted of a semiconductive armor tape (CAT) and a stress-grading tape (SGT).…”

Section: Current Applications Of Nonlinear Polymer Composites In Hv Engineeringmentioning

confidence: 99%

Section: Current Applications Of Nonlinear Polymer Composites In Hv Engineeringmentioning

confidence: 99%

“…The geometry of the stress-grading system used in the FEM is presented in Figure 53. The results of the simulation with three different levels of SGT conductivities are also presented [40]. The concentration of equipotential lines remains important, especially near the end of the shield in the case of the standard (EPDM) cable termination.…”

Section: Current Applications Of Nonlinear Polymer Composites In Hv Engineeringmentioning

confidence: 99%

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Nonlinear Electrical Conduction in Polymer Composites for Field Grading in High-Voltage Applications: A Review

et al. 2021

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Applications of polymeric materials in electrical engineering increasingly require improvements in operating voltages, performance, reliability, and size reduction. However, the resulting increase on the electric field in electrical systems can prevent achieving these goals. Polymer composites, functionalized with conductive or semiconductive particles, can allow us to reduce the electric field, thus grading the field within the system. In this paper, a comprehensive review of field-grading materials, their properties, and recent developments and applications is provided to realize high-performance high-voltage engineering applications.

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Section: Electric-field Grading In Hv Applicationsmentioning

confidence: 99%

Section: Current Applications Of Nonlinear Polymer Composites In Hv Engineeringmentioning

confidence: 99%

Section: Current Applications Of Nonlinear Polymer Composites In Hv Engineeringmentioning

confidence: 99%

Section: Current Applications Of Nonlinear Polymer Composites In Hv Engineeringmentioning

confidence: 99%

See 2 more Smart Citations

Nonlinear Electrical Conduction in Polymer Composites for Field Grading in High-Voltage Applications: A Review

et al. 2021

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“…Conductive armor tape (CAT) is wound on the outside of the insulation tape to prevent partial discharge (PD) between the grounded slot's inner surface and the coil. The CAT promotes complete grounding of the outermost coil even under the condition of point contact between the slot and the coil [2]- [5]. The CAT is applied to the entire area of the straight part of the coil and extended to the beginning of the overhang region.…”

Section: Introductionmentioning

confidence: 99%

Stress Grading Performance Analysis of Stator Coil Considering the Manufacturing Method and the Insulation Design

Kim

2022

IEEE Access

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In rotating machines, the approach of applying nonlinear conductive stress grading tape (SGT) has been applied to reduce the electric field stress in the coil's overhang region. To characterize and verify the electric field grading effect of SGT in electric machines, electric field analysis using the nonlinear conductivity of SGT as a boundary condition must be considered. However, previous studies have shown limitations in the characterization and application of SGT materials in insulation system design for various reasons, such as lack of conductivity measurement standards for nonlinear materials or not considering possible changes in material properties during the manufacturing procedure. In this study, the nonlinear conductivity of SGT was measured by considering the rotating machine's manufacturing procedure. A finite element method (FEM) electric field analysis was performed using the measured nonlinear conductivity. Based on the improved conductivity measurement method of SGT and FEM analysis, the effects of changing several insulation design parameters in the field grading performance were studied on a 13.8 kV stator coil. Moreover, the effect of preheating on the SGT conductivity was also examined. Based on analysis results, we realized the possibility of more precise insulation design of the stator coil. Our findings supplement the insufficient insulation design guide on the SGT part and contribute to establishing a systematic approach for insulation design. Furthermore, the proposed methods enable design optimization and detection of the cause of insulation failure.

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Effectiveness of Stress Grading System Builds on the Heat Production in a Form-Wound Coil of an Inverter-fed Rotating Machine

Naeini

Cherney

Jayaram

2018

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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Effect of Stress Grading Tape Conductivity on the Electric Field Distribution in Stress Grading System of an Inverter-Fed Rotating Machine

Cited by 7 publications

References 8 publications

Nonlinear Electrical Conduction in Polymer Composites for Field Grading in High-Voltage Applications: A Review

Nonlinear Electrical Conduction in Polymer Composites for Field Grading in High-Voltage Applications: A Review

Stress Grading Performance Analysis of Stator Coil Considering the Manufacturing Method and the Insulation Design

Effectiveness of Stress Grading System Builds on the Heat Production in a Form-Wound Coil of an Inverter-fed Rotating Machine

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