Pub Date : 2016-09-01DOI: 10.1109/DEIV.2016.7763954
Chuan Xiang, Zhihui Huang, J. Zou
The anode is heated continuously by the inter-electrode plasma flowing towards the anode and cooled by evaporation and radiation during the arc interruption process of vacuum circuit breakers (VCBs). The anode thermal process determines whether the VCBs can interrupt the fault current successfully. In this study, we established a two-dimension anode thermal model taking into account the molten and phase change of local regions within anode, the Joule heating, the thermal conduction and the heat radiation. The heat flux density boundary condition on the anode surface utilized that obtained by solving of MHD equations of vacuum arc. Calculation of the temperature distribution and the molted pool size of anode were then conducted. After that, the analysis of the influence of arc current on the maximum temperature of anode during the current interruption was carried out in detail. The research work can serve as a base for the study of the post-arc dynamic dielectric recovery of VCBs.
{"title":"Analysis of anode thermal process of high-current vacuum arc","authors":"Chuan Xiang, Zhihui Huang, J. Zou","doi":"10.1109/DEIV.2016.7763954","DOIUrl":"https://doi.org/10.1109/DEIV.2016.7763954","url":null,"abstract":"The anode is heated continuously by the inter-electrode plasma flowing towards the anode and cooled by evaporation and radiation during the arc interruption process of vacuum circuit breakers (VCBs). The anode thermal process determines whether the VCBs can interrupt the fault current successfully. In this study, we established a two-dimension anode thermal model taking into account the molten and phase change of local regions within anode, the Joule heating, the thermal conduction and the heat radiation. The heat flux density boundary condition on the anode surface utilized that obtained by solving of MHD equations of vacuum arc. Calculation of the temperature distribution and the molted pool size of anode were then conducted. After that, the analysis of the influence of arc current on the maximum temperature of anode during the current interruption was carried out in detail. The research work can serve as a base for the study of the post-arc dynamic dielectric recovery of VCBs.","PeriodicalId":296641,"journal":{"name":"2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123450510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-09-01DOI: 10.1109/DEIV.2016.7763980
Xian Cheng, Lian-yao Jiao, Zhanqing Chen
By series connected with vacuum circuit breaker, the relatively limited arc-interruption capacity of the gas circuit breaker, which employs CO2 gas as the substitution to SF6 gas, can be compensated to match with or approach to the interruption capacity of SF6 gas circuit breaker. To investigate and optimize the voltage distribution between vacuum gap and CO2 gas gap, the three dimension models of the hybrid circuit breaker in different arrangement and placement modes are built in this paper. Electric field simulation is carried on the hybrid circuit breaker models to analyze the voltage distribution of the hybrid circuit breaker under static and transient voltages. The results of simulation prove that preferable voltage distribution between two gaps can be obtained while the hybrid circuit breaker arranged and placed in “45° angle” mode. And the simulation results provide references for the establishment of the prototype of hybrid circuit breaker.
{"title":"Simulation on the electric field distribution for hybrid circuit breaker based on vacuum gap and CO2 gas gap","authors":"Xian Cheng, Lian-yao Jiao, Zhanqing Chen","doi":"10.1109/DEIV.2016.7763980","DOIUrl":"https://doi.org/10.1109/DEIV.2016.7763980","url":null,"abstract":"By series connected with vacuum circuit breaker, the relatively limited arc-interruption capacity of the gas circuit breaker, which employs CO2 gas as the substitution to SF6 gas, can be compensated to match with or approach to the interruption capacity of SF6 gas circuit breaker. To investigate and optimize the voltage distribution between vacuum gap and CO2 gas gap, the three dimension models of the hybrid circuit breaker in different arrangement and placement modes are built in this paper. Electric field simulation is carried on the hybrid circuit breaker models to analyze the voltage distribution of the hybrid circuit breaker under static and transient voltages. The results of simulation prove that preferable voltage distribution between two gaps can be obtained while the hybrid circuit breaker arranged and placed in “45° angle” mode. And the simulation results provide references for the establishment of the prototype of hybrid circuit breaker.","PeriodicalId":296641,"journal":{"name":"2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123473704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-09-01DOI: 10.1109/DEIV.2016.7763990
Shusei Yokomichi, M. Kozako, M. Hikita, Kazuhiro Sato, T. Moriyama, H. Urai, T. Nakaoka, K. Tsuchiya
Investigation is made to establish a monitoring method for vacuum leakage from a vacuum interrupter (VI) using a discharge detection method. AC rated voltage is applied to a practical VI filled with air to cause partial discharge (PD) inside VI. A diagnostic method is studied using a number of sensors with different specification. An attempt is made to compare the detection sensitivity of PD for the various sensors. Experimental results reveal that the rise time and magnitude of PD signal waveform detected with each sensor vary depending on discharge phenomena occurring at different internal pressures of VI. As a result, it is suggested that PD detection with the suitable sensors can determine the internal pressure in VI, along with distinguishing PD signal from noise.
{"title":"Development of diagnostic methods for vacuum leakage from vacuum interrupter by partial discharge detection","authors":"Shusei Yokomichi, M. Kozako, M. Hikita, Kazuhiro Sato, T. Moriyama, H. Urai, T. Nakaoka, K. Tsuchiya","doi":"10.1109/DEIV.2016.7763990","DOIUrl":"https://doi.org/10.1109/DEIV.2016.7763990","url":null,"abstract":"Investigation is made to establish a monitoring method for vacuum leakage from a vacuum interrupter (VI) using a discharge detection method. AC rated voltage is applied to a practical VI filled with air to cause partial discharge (PD) inside VI. A diagnostic method is studied using a number of sensors with different specification. An attempt is made to compare the detection sensitivity of PD for the various sensors. Experimental results reveal that the rise time and magnitude of PD signal waveform detected with each sensor vary depending on discharge phenomena occurring at different internal pressures of VI. As a result, it is suggested that PD detection with the suitable sensors can determine the internal pressure in VI, along with distinguishing PD signal from noise.","PeriodicalId":296641,"journal":{"name":"2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123809943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-09-01DOI: 10.1109/DEIV.2016.7748694
T. Pieniak, M. Kurrat, D. Gentsch
Some vacuum interrupters (VI) are equipped with transversal magnetic field (TMF) contacts. A transversal directed Lorentz force makes the arc move circularly. The local surface temperature of the arc root is usually above the melting point at high current, which can be measured using a high-speed thermography camera. For this purpose, the emissivity of the contact material must be known. For Cu, we determined emissivity at εliq = 0.053 (liquid) and εsol = 0.035 (solid) for a spectral wavelength range of 1.5 μm-1.7 μm. A switching test was performed using spiral contacts (CuCr 75/25) with a diameter of 68 mm and a 50 Hz half-wave sinusoidal current of 19 kA (RMS). The temperature of an anode spot was examined using the thermography camera. We assumed emissivity at 0.3, with an anode spot temperature of up to 2650 K during the heating phase. During the cooling phase the temperature decreased after 0.55 ms at 2118 K and after 1.10 ms at 1863 K.
{"title":"Surface temperature measurement of transversal magnetic field contacts using a thermography camera","authors":"T. Pieniak, M. Kurrat, D. Gentsch","doi":"10.1109/DEIV.2016.7748694","DOIUrl":"https://doi.org/10.1109/DEIV.2016.7748694","url":null,"abstract":"Some vacuum interrupters (VI) are equipped with transversal magnetic field (TMF) contacts. A transversal directed Lorentz force makes the arc move circularly. The local surface temperature of the arc root is usually above the melting point at high current, which can be measured using a high-speed thermography camera. For this purpose, the emissivity of the contact material must be known. For Cu, we determined emissivity at εliq = 0.053 (liquid) and εsol = 0.035 (solid) for a spectral wavelength range of 1.5 μm-1.7 μm. A switching test was performed using spiral contacts (CuCr 75/25) with a diameter of 68 mm and a 50 Hz half-wave sinusoidal current of 19 kA (RMS). The temperature of an anode spot was examined using the thermography camera. We assumed emissivity at 0.3, with an anode spot temperature of up to 2650 K during the heating phase. During the cooling phase the temperature decreased after 0.55 ms at 2118 K and after 1.10 ms at 1863 K.","PeriodicalId":296641,"journal":{"name":"2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121972871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Breakdowns in the post-arc phase are affected by a combination effect of both plasma and metal vapor. The objective of this paper is to study the breakdown boundary as a function of plasma and metal vapor density. A fully kinetic PIC-MCC model was developed to study breakdowns in the post-arc phase. Relevant collisions were taken into consideration, and an external circuit was added to the model to make the calculations self-consistent. From the results, we obtained the breakdown boundary in the post-arc phase under effect of both metal vapor and residual plasma. The residual plasma does not play a major role in breakdowns if the density was below 1017 m-3. However, if the residual plasma density exceeded 1017 m-3, the critical metal atom density for a breakdown steeply decreased with the increase of the plasma density. Therefore, a sufficiently high plasma density gives rise to a higher probability of breakdowns. For this reason, the threshold of metal vapor density could be overestimated if the residual plasma is not considered in the simulations.
{"title":"Simulation on breakdowns in the post-arc phase of a vacuum interruption","authors":"Zhenxing Wang, Haoran Wang, Yanjun Jiang, Liqiong Sun, Jianhua Wang, Yingsan Geng, Zhiyuan Liu","doi":"10.1109/DEIV.2016.7763937","DOIUrl":"https://doi.org/10.1109/DEIV.2016.7763937","url":null,"abstract":"Breakdowns in the post-arc phase are affected by a combination effect of both plasma and metal vapor. The objective of this paper is to study the breakdown boundary as a function of plasma and metal vapor density. A fully kinetic PIC-MCC model was developed to study breakdowns in the post-arc phase. Relevant collisions were taken into consideration, and an external circuit was added to the model to make the calculations self-consistent. From the results, we obtained the breakdown boundary in the post-arc phase under effect of both metal vapor and residual plasma. The residual plasma does not play a major role in breakdowns if the density was below 1017 m-3. However, if the residual plasma density exceeded 1017 m-3, the critical metal atom density for a breakdown steeply decreased with the increase of the plasma density. Therefore, a sufficiently high plasma density gives rise to a higher probability of breakdowns. For this reason, the threshold of metal vapor density could be overestimated if the residual plasma is not considered in the simulations.","PeriodicalId":296641,"journal":{"name":"2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122196261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-09-01DOI: 10.1109/DEIV.2016.7763941
Zhanqing Chen, Xian Cheng, Lian-yao Jiao, G. Ge
CO2 gas is a possible substitute for SF6 gas in circuit breaker with relatively superior arc interruption performance. To enhance the interruption capacity of the circuit breaker which employs CO2 gas as its arc interruption dielectric, the interruption principle of the hybrid circuit breaker composed of vacuum interrupter and CO2 gas interrupter is studied. Based on the black-box arc models of hybrid circuit breaker built in ATP-EMTP, the interactions characteristics of vacuum interrupter and CO2 gas interrupter and the transient recovery voltage distribution between two interrupters during the interruption process are analyzed. The influence of voltage-dividing capacitors on transient recovery voltage distribution is discussed. The interruption capacity of hybrid circuit breaker and CO2 gas circuit breaker are compared. The results of simulation demonstrate that preferable transient recovery voltage distribution can be obtained under suitable control strategy while interrupters paralleled with voltage-dividing capacitors. The vacuum interrupter series connected with CO2 gas interrupter can assist in enhancing the high current interruption capacity of gas interrupter.
{"title":"Simulation on the high current interruption principle for hybrid circuit breaker of vacuum interrupter and CO2 gas interrupter","authors":"Zhanqing Chen, Xian Cheng, Lian-yao Jiao, G. Ge","doi":"10.1109/DEIV.2016.7763941","DOIUrl":"https://doi.org/10.1109/DEIV.2016.7763941","url":null,"abstract":"CO2 gas is a possible substitute for SF6 gas in circuit breaker with relatively superior arc interruption performance. To enhance the interruption capacity of the circuit breaker which employs CO2 gas as its arc interruption dielectric, the interruption principle of the hybrid circuit breaker composed of vacuum interrupter and CO2 gas interrupter is studied. Based on the black-box arc models of hybrid circuit breaker built in ATP-EMTP, the interactions characteristics of vacuum interrupter and CO2 gas interrupter and the transient recovery voltage distribution between two interrupters during the interruption process are analyzed. The influence of voltage-dividing capacitors on transient recovery voltage distribution is discussed. The interruption capacity of hybrid circuit breaker and CO2 gas circuit breaker are compared. The results of simulation demonstrate that preferable transient recovery voltage distribution can be obtained under suitable control strategy while interrupters paralleled with voltage-dividing capacitors. The vacuum interrupter series connected with CO2 gas interrupter can assist in enhancing the high current interruption capacity of gas interrupter.","PeriodicalId":296641,"journal":{"name":"2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124703285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-09-01DOI: 10.1109/DEIV.2016.7748675
Kazuki Sato, Y. Yamano, N. Asari, T. Shioiri, Takayoshi Icikawa
A contact electrode of vacuum interrupter (VI) has slit parts on the electrode surface to control the vacuum arc during the current interruption. The edge configuration of the slit is important for the withstand performance of high voltage application for VI. We investigated the effect of the curvature radius of slit's configuration on the field enhancement factor β and the characteristics of vacuum breakdown for the slit electrodes made of CuCr alloy simplified simulating the AMF-electrode. As the results, the round chamfered configuration at the edge of slit increases the breakdown field, because of the reduction of pre-breakdown current flowing, that is, small field emission current. This is due to be small β-value by rounding chamfering of the edge at the slit. The BD field of the slit electrode can be improved by rounding the edge of the end of the slit more than 1 mm curvature radius, and the curvature of 0.5 mm radius for R0.5 slit electrode had almost little effect on improving the BD field owing to manufacturing inadequate curvature at the edge of slit.
{"title":"Characteristics of vacuum breakdown field and comparison of field enhancement factor β in CuCr electrodes with slit configuration","authors":"Kazuki Sato, Y. Yamano, N. Asari, T. Shioiri, Takayoshi Icikawa","doi":"10.1109/DEIV.2016.7748675","DOIUrl":"https://doi.org/10.1109/DEIV.2016.7748675","url":null,"abstract":"A contact electrode of vacuum interrupter (VI) has slit parts on the electrode surface to control the vacuum arc during the current interruption. The edge configuration of the slit is important for the withstand performance of high voltage application for VI. We investigated the effect of the curvature radius of slit's configuration on the field enhancement factor β and the characteristics of vacuum breakdown for the slit electrodes made of CuCr alloy simplified simulating the AMF-electrode. As the results, the round chamfered configuration at the edge of slit increases the breakdown field, because of the reduction of pre-breakdown current flowing, that is, small field emission current. This is due to be small β-value by rounding chamfering of the edge at the slit. The BD field of the slit electrode can be improved by rounding the edge of the end of the slit more than 1 mm curvature radius, and the curvature of 0.5 mm radius for R0.5 slit electrode had almost little effect on improving the BD field owing to manufacturing inadequate curvature at the edge of slit.","PeriodicalId":296641,"journal":{"name":"2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130360649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-09-01DOI: 10.1109/DEIV.2016.7763996
Yingkui Zhang, Z. Shi, Qiaosen Wang, S. Jia, Lijun Wang
With the development of HVDC technology, the demand of HVDC circuit breaker is more and more urgent, where the testing standards for HVDC circuit breaker is still absent. It's impractical to carry out test in the real HVDC system at present. The high-power HVDC source is also a high-cost scheme. Therefore, in most of the experiments of HVDC circuit breaker, the current is supplied by AC source. In this paper, two experimental schemes based on LC source for HVDC circuit breaker are studied. The interruption process is simulated and compared among the DC source and LC source with two sets of parameters.
{"title":"Research on the experimental method for HVDC vacuum circuit breaker based on artificial current zero","authors":"Yingkui Zhang, Z. Shi, Qiaosen Wang, S. Jia, Lijun Wang","doi":"10.1109/DEIV.2016.7763996","DOIUrl":"https://doi.org/10.1109/DEIV.2016.7763996","url":null,"abstract":"With the development of HVDC technology, the demand of HVDC circuit breaker is more and more urgent, where the testing standards for HVDC circuit breaker is still absent. It's impractical to carry out test in the real HVDC system at present. The high-power HVDC source is also a high-cost scheme. Therefore, in most of the experiments of HVDC circuit breaker, the current is supplied by AC source. In this paper, two experimental schemes based on LC source for HVDC circuit breaker are studied. The interruption process is simulated and compared among the DC source and LC source with two sets of parameters.","PeriodicalId":296641,"journal":{"name":"2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128812902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-09-01DOI: 10.1109/DEIV.2016.7764009
Enyuan Dong, Qiao Li, Yu Tian, Taotao Qin, J. Zou
Based on the characters of repulsive force actuator for its fast speed in the opening and closing process, a kind of new-type fast circuit breaker energized by fault current was designed in this paper. With bus shunt as excitation current, double coil tandem repulsive force actuator and permanent magnetic actuator were composed together. This hybrid circuit breaker with new-type of excitation doesn't need receiving the order from logical judgment system or capacitor energy storage system. With spontaneous rapidity, its rapid opening speed is directly proportional related with the short current value. It has fast speed of response and action. On the basis of this structure, the simulation analysis and optimization was performed. Firstly, the coils' temperature-rise and turn-to-turn voltage under normal load were calculated to guarantee thermal stability and insulation reliability. Then the effect of output repulsive force was also analyzed to ensure the action's reliability. Besides, the break reliability was discussed when the short current meets the first zero crossing under different circuit phases and on this account the parameters of opening spring was optimized. Finally, the action mechanism of this new-type self-excitation hybrid circuit breaker was discussed in this paper. Based on finite element analysis and simulations, the fault current energized type hybrid circuit breaker prototype was manufactured. The experimental data verified that the new actuator can break circuit quickly and successfully under the presetting short-circuit threshold of 2.4kA.
{"title":"Research of a new type of fault current energized fast repulsive force actuator","authors":"Enyuan Dong, Qiao Li, Yu Tian, Taotao Qin, J. Zou","doi":"10.1109/DEIV.2016.7764009","DOIUrl":"https://doi.org/10.1109/DEIV.2016.7764009","url":null,"abstract":"Based on the characters of repulsive force actuator for its fast speed in the opening and closing process, a kind of new-type fast circuit breaker energized by fault current was designed in this paper. With bus shunt as excitation current, double coil tandem repulsive force actuator and permanent magnetic actuator were composed together. This hybrid circuit breaker with new-type of excitation doesn't need receiving the order from logical judgment system or capacitor energy storage system. With spontaneous rapidity, its rapid opening speed is directly proportional related with the short current value. It has fast speed of response and action. On the basis of this structure, the simulation analysis and optimization was performed. Firstly, the coils' temperature-rise and turn-to-turn voltage under normal load were calculated to guarantee thermal stability and insulation reliability. Then the effect of output repulsive force was also analyzed to ensure the action's reliability. Besides, the break reliability was discussed when the short current meets the first zero crossing under different circuit phases and on this account the parameters of opening spring was optimized. Finally, the action mechanism of this new-type self-excitation hybrid circuit breaker was discussed in this paper. Based on finite element analysis and simulations, the fault current energized type hybrid circuit breaker prototype was manufactured. The experimental data verified that the new actuator can break circuit quickly and successfully under the presetting short-circuit threshold of 2.4kA.","PeriodicalId":296641,"journal":{"name":"2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128857551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-09-01DOI: 10.1109/DEIV.2016.7763948
B. Kuehn, M. Kurrat, M. Hilbert, D. Gentsch
Switching chambers of vacuum interrupters (VI) are mainly built with ceramics as insulators. During the interruption process, the ceramics are coated by metal vapor from the contact material. In a worst case scenario, an electrical bypass is formed, caused by the metal coating on the ceramic insulators. To avoid this, dielectric shielding is used to provide the vapor coating surfaces with defined potentials. Different shield arrangements offer a balance between local field stress and effective protection against impact from the metal coating. In the current work, we developed an electric field simulation approach using COMSOL software. The purpose was to study the impact of the deposited layers on the performance of the VI with multiple shield arrangements. The simulations were done based on three different cases, using the same VI geometry: VI without metal coating on the ceramics; VI with graded metal coating on the ceramics; Breakdown condition between the head-shield and the metal coating on the ceramics. The identification of the effect of coatings on the electric field inside a VI during lightning impulse voltage stress can help to evaluate the breakdown voltage of the whole arrangement. Therefore, we simulated the redistribution of the electric field strength over the remaining insulated shields.
{"title":"Multiple shield arrangements breakdown model in vacuum interrupters","authors":"B. Kuehn, M. Kurrat, M. Hilbert, D. Gentsch","doi":"10.1109/DEIV.2016.7763948","DOIUrl":"https://doi.org/10.1109/DEIV.2016.7763948","url":null,"abstract":"Switching chambers of vacuum interrupters (VI) are mainly built with ceramics as insulators. During the interruption process, the ceramics are coated by metal vapor from the contact material. In a worst case scenario, an electrical bypass is formed, caused by the metal coating on the ceramic insulators. To avoid this, dielectric shielding is used to provide the vapor coating surfaces with defined potentials. Different shield arrangements offer a balance between local field stress and effective protection against impact from the metal coating. In the current work, we developed an electric field simulation approach using COMSOL software. The purpose was to study the impact of the deposited layers on the performance of the VI with multiple shield arrangements. The simulations were done based on three different cases, using the same VI geometry: VI without metal coating on the ceramics; VI with graded metal coating on the ceramics; Breakdown condition between the head-shield and the metal coating on the ceramics. The identification of the effect of coatings on the electric field inside a VI during lightning impulse voltage stress can help to evaluate the breakdown voltage of the whole arrangement. Therefore, we simulated the redistribution of the electric field strength over the remaining insulated shields.","PeriodicalId":296641,"journal":{"name":"2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130439463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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