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Effect of Temperature on RPDIV of Enamel Twisted Pair under Repetitive Impulse Voltage Application with Different Rise Time
Yuki Zenda;Sho Takenouchi;Masahiro Kozako;Masayuki Hikita;Tetsushi Okamoto;Sun Jintong;Aoto Izumi;Kazunari Karasawa
2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)
Year: 2021 | Conference Paper |
Cited by: Papers (3)
An increase in the capacitance of the stator winding of an inverter-fed motor increases the rise time of repetitive impulse voltage. It has been reported that partial discharge inception voltage (PDIV) of the windings decreases as the rise time increases. This paper deals with the effect of the rise time on PDIV of enamel twisted pair samples simulating the insulation system of the windings of inv...Show More
Proposal of Noise Rejection in Automatic Measurement System of Repetitive Partial Discharge Inception Voltage
Yasutaka Nishigaki;Sho Takenouchi;Masahiro Kozako;Masayuki Hikita;Takahiro Nakamura;Jintong Sun;Aoto Izumi;Takayuki Sakurai;Kazunari Karasawa;Tatsuya Hirose
2020 International Symposium on Electrical Insulating Materials (ISEIM)
Year: 2020 | Conference Paper |
Repetitive partial discharge inception voltage (RPDIV) measurement is necessary for inverter-fed motor when testing according to IEC 60034-18-41. Our previous study showed an influence of the position and distance of EM sensor on the sensitivity of detected EM wave to quantitatively evaluate RPDIV by using the RPDIV automatic measurement system. This paper deals with proposal of a new PDIV automat...Show More
High Temperature Partial Discharge Inception Voltage under Repetitive Impulse Voltage Applied to Motorette Samples
Yasutaka Nishigaki;Takakazu Matsuzoe;Sho Takenouchi;Masahiro Kozako;Masayuki Hikita;Takahiro Nakamura;Jintong Sun;Aoto Izumi;Takayuki Sakurai;Kazunari Karasawa;Satoshi Hiroshima
2020 IEEE Electrical Insulation Conference (EIC)
Year: 2020 | Conference Paper |
Cited by: Papers (3)
This paper presents a measurement method for partial discharge inception voltage (PDIV) and repetitive PDIV (RPDIV) of motorette samples with different terminal connections from room temperature to 155°C PDIV and RPDIV characteristics of the motorlet sample up to the high-temperature region were clarified. As a result, PDIV and RPDIV were found to decrease under high temperature environment. These...Show More
High Temperature Partial Discharge Inception Voltage under Repetitive Impulse Voltage Applied to Motorette Samples
Yasutaka Nishigaki;Takakazu Matsuzoe;Sho Takenouchi;Masahiro Kozako;Masayuki Hikita;Takahiro Nakamura;Jintong Sun;Aoto Izumi;Takayuki Sakurai;Kazunari Karasawa;Satoshi Hiroshima
Year: 2020 | Conference Paper |
Computational Approach to Electrical and Thermal behavior at End-turn Stress Grading System of Inverter-fed Rotating Machine under PWM Waveform
2020 IEEE Electrical Insulation Conference (EIC)
Year: 2020 | Conference Paper |
Cited by: Papers (1)
SiC-based nonlinear conductive stress grading tape (SGT) has been used at an end-turn stress grading system of a form-wound rotating machine. Although previous researches reported that high-frequency repetitive pulses cause electric field enhancement and local heating at the SG system, few paper deals with the detailed electrical and thermal behaviors under pulse width modulation (PWM) waveforms, ...Show More
Fundamental and carrier frequency-dependence on electric field and power dissipation for Inverter-fed High Voltage Rotating Machine
2020 IEEE Electrical Insulation Conference (EIC)
Year: 2020 | Conference Paper |
Cited by: Papers (2)
In this study, transient analysis of Stress Grading(SG) system under PWM waveform is conducted to reveal the effects of fundamental frequency on potential distribution and power density. Risetime, level and jump voltage of PWM waveform used in an analysis is 1μs, 3 and 5 kV, respectively. Fundamental and carrier frequencies are changed in the range from 50-500 Hz and 0.5-6 kHz, respectively. For c...Show More
Light Emission with Partial Discharge at the Stator Coil End of a Rotating Machine under Operating Temperature
Takaaki Onoda;Yuki Hasegawa;Akiko Kumada;Kunihiko Hidaka;Takahiro Umemoto;Takahiro Nakamura;Kazunari Karasawa
2020 IEEE Electrical Insulation Conference (EIC)
Year: 2020 | Conference Paper |
Cited by: Papers (2)
Electric field grading system (SG system) is introduced to prevent partial discharge at the stator coil end of a rotating machine. The SG system consists of corona armor tape (CAT) and stress grading tape/paint (SGT/SGP). The CAT is a carbon-loaded highly-conductive tape and is wound over the main insulation. A SGT/SGP is a silicon carbide powder-loaded tape/paint with field-dependent conductivity...Show More
Temperature Dependence of RPDIV of Motorette Sample with Varnish Treatment
Yasutaka Nishigaki;Takakazu Matsuzoe;Tomohiro Kubo;Yusuke Nakano;Masahiro Kozako;Masayuki Hikita;Takahiro Nakamura;Jintong Sun;Aoto Izumi;Takavuki Sakurai;Kazunari Karasawa;Kenichi Nojima
2019 IEEE Electrical Insulation Conference (EIC)
Year: 2019 | Conference Paper |
Cited by: Papers (7)
Recently, driving of inverters has been advanced to improve the characteristics of motors. Along with that, concerns are raised that inverter surge deteriorates the insulation system of the motor. The problem of insulation deterioration is particularly serious in high-voltage motors where insulation structure is important, and analysis of phenomena of deterioration is strongly desired. We have mea...Show More
Determination of Partial Discharge Location in Stator Core using Loop Sensors
Junya Maki;Tomohiro Kubo;Takakazu Matsuzoe;Yusuke Nakano;Masahiro Kozako;Masayuki Hikita;Takahisa Ueno;Jintong Sun;Aoto Izumi;Kazunari Karasawa
2018 Condition Monitoring and Diagnosis (CMD)
Year: 2018 | Conference Paper |
Inverter drive motors with higher voltage, higher-speed switching and efficiency are required in various industrial sectors. The problem in inverter drive motors is the inverter surge voltage due to high-speed switching, which can cause partial discharge (PD) and degradation of insulation performance of motors. The purpose of present research is to establish the diagnostic technique for high volta...Show More
Influence of Electromagnetic Sensor Location on Repetitive Partial Discharge Inception Voltage in Actual Stator Core of Inverter Fed Motor
Masayuki Hikita;Hikaru Mizoguchi;Tomohiro Kubo;Tomoki Uchimura;Masahiro Kozako;Jintong Sun;Aoto Izumi;Kazunari Karasawa;Takahisa Ueno;Tatsuya Hirose;Satoshi Hiroshima
2018 IEEE Electrical Insulation Conference (EIC)
Year: 2018 | Conference Paper |
Cited by: Papers (2)
Repetitive partial discharge inception voltage (RPDIV) measurement is indispensable for inverter-fed motor when testing the insulation dignity according to IEC 60034-18-41 IS. Our previous study showed detection sensitivity comparison among kinds of electromagnetic (EM) sensors for PD measurement in an actual motor core. This paper deals with an influence of the location of EM sensors on the sensi...Show More
Influence of Electromagnetic Sensor Location on Repetitive Partial Discharge Inception Voltage in Actual Stator Core of Inverter Fed Motor
Masayuki Hikita;Hikaru Mizoguchi;Tomohiro Kubo;Tomoki Uchimura;Masahiro Kozako;Jintong Sun;Aoto Izumi;Kazunari Karasawa;Takahisa Ueno;Tatsuya Hirose;Satoshi Hiroshima
Year: 2018 | Conference Paper |
Characterization of Optimized SGT Characteristics
Steven A. Boggs;Akiko Kumada;Kenichi Nojma;Kazunari Karasawa
2018 IEEE Electrical Insulation Conference (EIC)
Year: 2018 | Conference Paper |
Cited by: Papers (2)
This contribution addresses the quantitative relationship between end turn stress grading characteristics of form would rotating machines driven by PWM waveforms and the stress grading nonlinear properties based on mathematical analysis and confirmed by FEA computations. Power dissipation is also addressed.Show More
Sensitivity characteristics of partial discharge electromagnetic sensor located in stator core
Tomohiro Kubo;Tomoki Uchimura;Masahiro Kozako;Masayuki Hikita;Takahisa Ueno;Jintong Sun;Aoto Izumi;Kazunari Karasawa;Tatsuya Hirose;Satoshi Hiroshima
2017 International Symposium on Electrical Insulating Materials (ISEIM)
Year: 2017 | Conference Paper |
Cited by: Papers (9)
Repetitive partial discharge inception voltage (RPDIV) measurement is indispensable for inverter-fed motor when testing according to IEC 60034-18-41 IS. Our previous study showed sensitivity comparison between kinds of electromagnetic (EM) sensors and a partial discharge (PD) measuring device in an actual motor core. This paper deals with an influence of the position and distance of EM sensor on t...Show More
Surface corona inception on stress grading system in end-turn regions of rotating machines
A. Kumada;D. Onishi;Y. Morita;T. Nakamura;K. Hidaka;S. A. Boggs;Y. Tsuboi;T. Kisakibaru;K. Karasawa
2017 INSUCON - 13th International Electrical Insulation Conference (INSUCON)
Year: 2017 | Conference Paper |
Cited by: Papers (8)
The transients generated by drives based on pulse width modulation (PWM) have adverse effects on the insulation system of rotating machines, especially the stress grading (SG) system used in the endturn region. The surface corona inception voltage on SG system under repetitive impulse, 1kHz sinusoidal, and 1kHz square voltages was measured using a photomultiplier connected to optical fiber bundle,...Show More
Comparison of sensor detection sensitivity in Repetitive Partial Discharge Inception Voltage measurement for twisted pair placed in stator
Keigo Nakamura;Tomoki Uchimura;Masahiro Kozako;Masayuki Hikita;Takahisa Ueno;Jintong Sun;Takayuki Sakurai;Kazuhisa Nakayama;Tomomi Ikegami;Kazunari Karasawa
2016 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)
Year: 2016 | Conference Paper |
Cited by: Papers (3)
RPDIV (Repetitive Partial Discharge Inception Voltage) measurement becomes essential to fulfill a certificate test according to IEC60034-18-41IS for inverter-fed motor. In measurement of RPDIV, electromagnetic antenna is often used as a PD sensor. Thus, the detection sensitivity of the sensor is crucial to properly determine RPDIV. This paper deals with sensitivity comparison between kinds of elec...Show More
Comparison of sensor detection sensitivity in Repetitive Partial Discharge Inception Voltage measurement for twisted pair placed in stator
Keigo Nakamura;Tomoki Uchimura;Masahiro Kozako;Masayuki Hikita;Takahisa Ueno;Jintong Sun;Takayuki Sakurai;Kazuhisa Nakayama;Tomomi Ikegami;Kazunari Karasawa
Year: 2016 | Conference Paper |
Novel evaluation methods of end-turn stress grading materials for converter-fed high voltage rotating machines
Takahiro Umemoto;Takao Tsurimoto;Tomohito Kisakibaru;Takayuki Sakurai;Toshihiro Tsuda;Kazunari Karasawa
2016 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)
Year: 2016 | Conference Paper |
Cited by: Papers (8)
Carbon-based semi-conductive materials (corona armor tape or CAT), and SiC-based nonlinear grading materials have been used widely to reduce the electric field in the region where the stator bar exits from the slot in form-wound rotating machines. Recent studies show that electric field and local heating in the end-turn stress grading system become severe under PWM waveforms and high frequency rep...Show More
Optimal resistance of stress grading system in converter-fed rotating machines
T. Nakamura;Y. Morita;A. Kumada;H. Ikeda;K. Hidaka;Y. Tsuboi;T. Kisakibaru;T. Sakurai;K. Karasawa
2016 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)
Year: 2016 | Conference Paper |
Cited by: Papers (4)
Excessive heat generation and occurrence of partial discharge have been observed in end-turn stress grading (SG) system in form-wound machines under PWM voltage. In this paper, multi-winding stress grading (SG) system is proposed as a method to change resistance of SG per length. Although the maximum field at the edge of stator and CAT are in a trade-off relationship, analytical results suggest th...Show More
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