Pub Date : 2019-10-01DOI: 10.1109/ICEPE-ST.2019.8928852
Yuyou Long, Feng Zhu, S. Xiu, Fengxiang Ma, Zepeng Chen, Z. Su
Sulfur hexafluoride (SF6) has excellent insulating and arc quenching properties, but it has strong greenhouse effect which is 23900 times of CO2. Nitrogen (N2) is an environmental-friendly gas with good insulation performance and is developed to use in gas insulated equipment in recent years. In this paper, the effect of humidity and purity on N2 insulated switchgear was researched. A 40.5 kV N2 insulated switchgear was taken as the test object. Short-duration power-frequency withstand voltage test and lightning impulse voltage test were carried out under different gas purity and humidity. The test results showed that N2 mixed with 20% O2 can pass both tests. N2 containing 650 ppm, 1200 ppm and 2380 ppm water can pass both tests. While the water content increased to 12700 ppm, the switchgear cannot pass the test. From the aspects of ionization energy and electronegativity, the test results were analyzed. The results can provide guidance and basis for the maintenance and operation of N2 insulated switchgears.
{"title":"Experiment Study on the Influence of Gas Humidity and Purity on the Property of 40.5 kV N2 Insulated Switchgear","authors":"Yuyou Long, Feng Zhu, S. Xiu, Fengxiang Ma, Zepeng Chen, Z. Su","doi":"10.1109/ICEPE-ST.2019.8928852","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928852","url":null,"abstract":"Sulfur hexafluoride (SF6) has excellent insulating and arc quenching properties, but it has strong greenhouse effect which is 23900 times of CO2. Nitrogen (N2) is an environmental-friendly gas with good insulation performance and is developed to use in gas insulated equipment in recent years. In this paper, the effect of humidity and purity on N2 insulated switchgear was researched. A 40.5 kV N2 insulated switchgear was taken as the test object. Short-duration power-frequency withstand voltage test and lightning impulse voltage test were carried out under different gas purity and humidity. The test results showed that N2 mixed with 20% O2 can pass both tests. N2 containing 650 ppm, 1200 ppm and 2380 ppm water can pass both tests. While the water content increased to 12700 ppm, the switchgear cannot pass the test. From the aspects of ionization energy and electronegativity, the test results were analyzed. The results can provide guidance and basis for the maintenance and operation of N2 insulated switchgears.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121774541","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 : 2019-10-01DOI: 10.1109/ICEPE-ST.2019.8928802
Haonan Sun, Yi Wu, Yasunori Tanaka, K. Tomita, M. Rong
This paper compares non-chemical equilibrium effects in decaying arc in different gases and various conditions. The influences of the gas flow rate, the arc current, the pressure and the gas medium were investigated on the non-chemical equilibrium behavior. By increasing the arc current and the nozzle pressure, the non-chemical equilibrium effect will decrease. On the contrary, increasing gas flow rate enhances the non-chemical equilibrium effects. Additionally, the arc behaviors in different gas medium, which are air, N2 and O2 were investigated in this work. Since in different gas medium the reaction process will be quite different, even if the thermodynamic and transport properties of the gas medium are similar, the arc behaviors will be quite different. Therefore, here is a very important conclusion: in the previous works it was usually considered that the thermodynamic and transport properties will determine the arc behavior necessarily; the comparisons in this works clearly illustrate that the process and reaction path in the arc plasma will influence the arc behavior during the arc decaying phase dominantly.
{"title":"Comparison of Non-Chemical Equilibrium Effects in the Decaying Arc in Different Gases and Conditions","authors":"Haonan Sun, Yi Wu, Yasunori Tanaka, K. Tomita, M. Rong","doi":"10.1109/ICEPE-ST.2019.8928802","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928802","url":null,"abstract":"This paper compares non-chemical equilibrium effects in decaying arc in different gases and various conditions. The influences of the gas flow rate, the arc current, the pressure and the gas medium were investigated on the non-chemical equilibrium behavior. By increasing the arc current and the nozzle pressure, the non-chemical equilibrium effect will decrease. On the contrary, increasing gas flow rate enhances the non-chemical equilibrium effects. Additionally, the arc behaviors in different gas medium, which are air, N2 and O2 were investigated in this work. Since in different gas medium the reaction process will be quite different, even if the thermodynamic and transport properties of the gas medium are similar, the arc behaviors will be quite different. Therefore, here is a very important conclusion: in the previous works it was usually considered that the thermodynamic and transport properties will determine the arc behavior necessarily; the comparisons in this works clearly illustrate that the process and reaction path in the arc plasma will influence the arc behavior during the arc decaying phase dominantly.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122567627","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 : 2019-10-01DOI: 10.1109/ICEPE-ST.2019.8928784
Jiahuan Gu, Z. Cai, Shaohua Ma, Yahong Zheng
At present, the research on electromagnetic mechanism mainly includes the dynamic characteristics analysis of the mechanism, the optimization design of the structural parameters and the discharge loop parameters, and the lack of research and analysis of the energy conversion mechanism. Therefore, how to characterize the energy action form and law in the electromagnetic mechanism has always been the design field. difficulty. Therefore, this article will use MXCDB type DC [1] contactor as the object to analyze the different ways of energy conversion process and energy consumption and summarize its influence law.
{"title":"DC Contactor Energy Conversion Research","authors":"Jiahuan Gu, Z. Cai, Shaohua Ma, Yahong Zheng","doi":"10.1109/ICEPE-ST.2019.8928784","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928784","url":null,"abstract":"At present, the research on electromagnetic mechanism mainly includes the dynamic characteristics analysis of the mechanism, the optimization design of the structural parameters and the discharge loop parameters, and the lack of research and analysis of the energy conversion mechanism. Therefore, how to characterize the energy action form and law in the electromagnetic mechanism has always been the design field. difficulty. Therefore, this article will use MXCDB type DC [1] contactor as the object to analyze the different ways of energy conversion process and energy consumption and summarize its influence law.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"89 1-2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116564033","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 : 2019-10-01DOI: 10.1109/ICEPE-ST.2019.8928742
Yukihiko Himata, T. Koshizuka, K. Hidaka
When transformer is being energized a large magnetizing inrush current flows depending upon the closing phase of circuit breakers and the residual magnetic flux in the iron core. One of the suppressing the magnetizing inrush current method is to control closing phase of the circuit breaker. For the controlled switching, it is essential to grasp condition of residual magnetic flux in the iron core. Ample studies show the residual magnetic flux for no-load transformers. The residual magnetic flux for three-phase and three-leg transformer had been investigated. However, little is known about residual magnetic flux of transformer of high resistance grounding system. In this paper, the residual magnetic flux of transformer using in high resistance grounding system was investigated by experiments and calculations.
{"title":"Residual Magnetic Flux in High Resistance Grounding System","authors":"Yukihiko Himata, T. Koshizuka, K. Hidaka","doi":"10.1109/ICEPE-ST.2019.8928742","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928742","url":null,"abstract":"When transformer is being energized a large magnetizing inrush current flows depending upon the closing phase of circuit breakers and the residual magnetic flux in the iron core. One of the suppressing the magnetizing inrush current method is to control closing phase of the circuit breaker. For the controlled switching, it is essential to grasp condition of residual magnetic flux in the iron core. Ample studies show the residual magnetic flux for no-load transformers. The residual magnetic flux for three-phase and three-leg transformer had been investigated. However, little is known about residual magnetic flux of transformer of high resistance grounding system. In this paper, the residual magnetic flux of transformer using in high resistance grounding system was investigated by experiments and calculations.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123785555","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 : 2019-10-01DOI: 10.1109/ICEPE-ST.2019.8928748
Akihiro Suwa, Kazuya Kato, Y. Matsui, M. Sakaki
The purpose of this paper is to clarify the electrode material that is optimum for DC interruption by VCB. Since there is no current zero point in DC, the test was carried out by a method in which high-frequency current is injected into a main current from another circuit to generate a current zero point. The test was performed with changing the main current value, the high-frequency current value, the frequency of the high-frequency current, and the high-frequency injection timing. The electrode was axial magnetic field type, and we tested four types of contact materials such as Cu, CuCr, AgWC. In addition, the behavior of the arc between the electrodes during high-frequency current injection was recorded using a high speed camera in the interruption success and the interruption failure condition. When the interruption was successful, it was observed that the plasma between the electrodes diffuses in a time shorter than 4.8 μs. When the interruption was failed, it was observed that the plasma between the electrodes don't disappear. The high-frequency interruption performance in various electrode materials was evaluated by the index consisting of the product of the residual plasma density between the electrodes and the gradient of the current at the current zero point. It was found that CuCr electrode with Cu weight ratio above 50% is superior for high-frequency interruption performance.
{"title":"Evaluation of DC Interruption Performance of VCB in Various Electrode Materials","authors":"Akihiro Suwa, Kazuya Kato, Y. Matsui, M. Sakaki","doi":"10.1109/ICEPE-ST.2019.8928748","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928748","url":null,"abstract":"The purpose of this paper is to clarify the electrode material that is optimum for DC interruption by VCB. Since there is no current zero point in DC, the test was carried out by a method in which high-frequency current is injected into a main current from another circuit to generate a current zero point. The test was performed with changing the main current value, the high-frequency current value, the frequency of the high-frequency current, and the high-frequency injection timing. The electrode was axial magnetic field type, and we tested four types of contact materials such as Cu, CuCr, AgWC. In addition, the behavior of the arc between the electrodes during high-frequency current injection was recorded using a high speed camera in the interruption success and the interruption failure condition. When the interruption was successful, it was observed that the plasma between the electrodes diffuses in a time shorter than 4.8 μs. When the interruption was failed, it was observed that the plasma between the electrodes don't disappear. The high-frequency interruption performance in various electrode materials was evaluated by the index consisting of the product of the residual plasma density between the electrodes and the gradient of the current at the current zero point. It was found that CuCr electrode with Cu weight ratio above 50% is superior for high-frequency interruption performance.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"184 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122302211","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 : 2019-10-01DOI: 10.1109/ICEPE-ST.2019.8928782
Asato Takahashi, N. Kodama, Y. Yokomizu, Y. Kondo
The following three experiments were conducted as an attempt to raise the DC arc voltage during current interrupting process in silica sand. The purpose of the first experiment is to examine the influence of the interelectrode distance of the graphite electrode on the arc length. The three types of interelectrode distance were set in the arc quenching chamber and supplied a damping DC current. As experimental results, voltage between electrodes was not effectively rose with elongation in interelectrode distance in the silica sand. The purpose of the second experiment is to achieve further rise in the arc voltage. In this experiment, PA66-cylinder was arranged between electrodes. As the experiment result, arrangement of PA66-cylinder effectively increases the arc voltage. This may be because the expansion of the arc diameter was restricted to the interaction between the arc and the inner wall of the cylinder. The purpose of the third experiment is to investigate the influence of arc voltage rise effect on the inner diameter of the cylinder. The main factors causing the arc voltage rise are the effect of limiting the arc diameter by the inner diameter and the effect of ablating of silica sand.
{"title":"Rise Effect of DC Arc Voltage in Silica Sand: Various Interelectrode Distances and Arrangement of PA66-Cylinder","authors":"Asato Takahashi, N. Kodama, Y. Yokomizu, Y. Kondo","doi":"10.1109/ICEPE-ST.2019.8928782","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928782","url":null,"abstract":"The following three experiments were conducted as an attempt to raise the DC arc voltage during current interrupting process in silica sand. The purpose of the first experiment is to examine the influence of the interelectrode distance of the graphite electrode on the arc length. The three types of interelectrode distance were set in the arc quenching chamber and supplied a damping DC current. As experimental results, voltage between electrodes was not effectively rose with elongation in interelectrode distance in the silica sand. The purpose of the second experiment is to achieve further rise in the arc voltage. In this experiment, PA66-cylinder was arranged between electrodes. As the experiment result, arrangement of PA66-cylinder effectively increases the arc voltage. This may be because the expansion of the arc diameter was restricted to the interaction between the arc and the inner wall of the cylinder. The purpose of the third experiment is to investigate the influence of arc voltage rise effect on the inner diameter of the cylinder. The main factors causing the arc voltage rise are the effect of limiting the arc diameter by the inner diameter and the effect of ablating of silica sand.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128112414","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 : 2019-10-01DOI: 10.1109/ICEPE-ST.2019.8928845
Miaozhong Cai, Ziying Zhang, J. Zou, Zhihui Huang, Ruitong Liu
A composite magnetic field contact dedicated to DC vacuum circuit breaker is designed. Magnetic field simulation and DC breaking experiments were completed for this type of contact. The breaking current amplitude is 5 1kA, the commutation frequency is 3000 Hz, and the arc image is taken by high speed photography. The simulation analyzes Magnetic field distribution of composite magnetic field contacts and the Lorentz force of the arc on the contact surface. The trend of the arc is predicted. Experimental results show, under the condition of DC low current medium frequency breaking, the AMF-TMF contact can effectively drive the arc rotation. However, the rotation effect is not obvious. And the arc can move to the Axial Magnetic Field contact under the influence of the magnetic blowing force. The arc maintains the diffusion state after the contact reaches a certain opening distance, then it is extinguished when the current crosses zero. This kind of contact meets the demand of DC low current breaking.
{"title":"Research on Composite Magnetic Field Contact of DC Vacuum Circuit Breaker and Its Arc Behavior","authors":"Miaozhong Cai, Ziying Zhang, J. Zou, Zhihui Huang, Ruitong Liu","doi":"10.1109/ICEPE-ST.2019.8928845","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928845","url":null,"abstract":"A composite magnetic field contact dedicated to DC vacuum circuit breaker is designed. Magnetic field simulation and DC breaking experiments were completed for this type of contact. The breaking current amplitude is 5 1kA, the commutation frequency is 3000 Hz, and the arc image is taken by high speed photography. The simulation analyzes Magnetic field distribution of composite magnetic field contacts and the Lorentz force of the arc on the contact surface. The trend of the arc is predicted. Experimental results show, under the condition of DC low current medium frequency breaking, the AMF-TMF contact can effectively drive the arc rotation. However, the rotation effect is not obvious. And the arc can move to the Axial Magnetic Field contact under the influence of the magnetic blowing force. The arc maintains the diffusion state after the contact reaches a certain opening distance, then it is extinguished when the current crosses zero. This kind of contact meets the demand of DC low current breaking.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"27 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133797410","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 : 2019-10-01DOI: 10.1109/ICEPE-ST.2019.8928816
N. Kodama, Y. Yokomizu, Koya Nakamura, Asato Takahashi, Y. Kondo
This report describes experimental results on DC interruption for three experiments: (1) silica-sand filling (designation: Silica), (2) polymer cylinder installation without silica-sand filling (designation: P5-Air), and (3) polymer cylinder installation with silica-sand filling (designation: P5-Silica). The shape of polymer cylinder was fixed at an inner diameter of 5 mm and a length of 15 mm. A damping DC with a peak current of 750 A was supplied to an established experimental system. A current and a voltage between electrodes were measured during the current supplying period. As experimental results, the arc resistance between electrodes were measured to be 0.15 Ω for Silica, 0.20 Ω for P5-Air and 0.56 Ω for P5-Silica at a peak current, respectively. This implies that silica-sand confined in the polymer cylinder effectively contributes to the arc voltage rise at around a peak current. During a current decaying periods, the arc resistance for P5-Air was measured to be almost same value for P5-Silica. This also implies that an interaction between the polymer and the arc rises the arc resistance during the current decaying period.
{"title":"Approach to Mechanism Interpretation of Arc Voltage Rise by Polymer Cylinder Installation in Silica-Sand","authors":"N. Kodama, Y. Yokomizu, Koya Nakamura, Asato Takahashi, Y. Kondo","doi":"10.1109/ICEPE-ST.2019.8928816","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928816","url":null,"abstract":"This report describes experimental results on DC interruption for three experiments: (1) silica-sand filling (designation: Silica), (2) polymer cylinder installation without silica-sand filling (designation: P5-Air), and (3) polymer cylinder installation with silica-sand filling (designation: P5-Silica). The shape of polymer cylinder was fixed at an inner diameter of 5 mm and a length of 15 mm. A damping DC with a peak current of 750 A was supplied to an established experimental system. A current and a voltage between electrodes were measured during the current supplying period. As experimental results, the arc resistance between electrodes were measured to be 0.15 Ω for Silica, 0.20 Ω for P5-Air and 0.56 Ω for P5-Silica at a peak current, respectively. This implies that silica-sand confined in the polymer cylinder effectively contributes to the arc voltage rise at around a peak current. During a current decaying periods, the arc resistance for P5-Air was measured to be almost same value for P5-Silica. This also implies that an interaction between the polymer and the arc rises the arc resistance during the current decaying period.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134601461","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 : 2019-10-01DOI: 10.1109/ICEPE-ST.2019.8928861
Yi Li, Guan Wang, Jiankun Liu, Zhenxing Wang, Jianhua Wang, Yingsan Geng, Zhiyuan Liu
It is well known that the transverse magnetic field (TMF) can drive the vacuum arc to move continuously on the contact in vacuum interrupters, resulting in a non-axisymmetric characteristic of the vacuum arc. The movement and shape of the vacuum arc will directly influence the interactions between the arc and the electrode, which in turn affects the burning of the arc and successful interruption of the interrupters. In this paper, the motion and morphological changes of a vacuum arc driven by TMF were obtained by adopting a three-dimensional diagnosis method. The vacuum arc was observed by a 3D vacuum arc imaging system from multiple directions, and reconstructed by filtered back-projection (FBP) and Algebra Reconstruction Technique (ART) method based on the record from those directions. Contacts were used with CuCr50 as the contact material. Through the above method, we obtained a 3D model morphological model of a vacuum arc driven by a transverse magnetic field, and analyzed the movement of the vacuum arc under TMF contact by the 3D vacuum arc model.
{"title":"3-D Reconstruction of Vacuum Arc Motion under Transverse Magnetic Fields","authors":"Yi Li, Guan Wang, Jiankun Liu, Zhenxing Wang, Jianhua Wang, Yingsan Geng, Zhiyuan Liu","doi":"10.1109/ICEPE-ST.2019.8928861","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928861","url":null,"abstract":"It is well known that the transverse magnetic field (TMF) can drive the vacuum arc to move continuously on the contact in vacuum interrupters, resulting in a non-axisymmetric characteristic of the vacuum arc. The movement and shape of the vacuum arc will directly influence the interactions between the arc and the electrode, which in turn affects the burning of the arc and successful interruption of the interrupters. In this paper, the motion and morphological changes of a vacuum arc driven by TMF were obtained by adopting a three-dimensional diagnosis method. The vacuum arc was observed by a 3D vacuum arc imaging system from multiple directions, and reconstructed by filtered back-projection (FBP) and Algebra Reconstruction Technique (ART) method based on the record from those directions. Contacts were used with CuCr50 as the contact material. Through the above method, we obtained a 3D model morphological model of a vacuum arc driven by a transverse magnetic field, and analyzed the movement of the vacuum arc under TMF contact by the 3D vacuum arc model.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133361007","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 : 2019-10-01DOI: 10.1109/ICEPE-ST.2019.8928721
Meng Shen, Chunmin Zhang, Bo Wang, Chen Liu, Lei Zhong, Xiaoyan Guo
With the rapid development of China's UHV power grid, UHV switchgear has been widely used in UHV power system. Due to the large capacity of UHV switchgear, the overshoot and power-frequency voltage drop are also too large during lightning impulse test. This problem has become a hot issue that is widely concerned by engineers. Taking 1100kV GIS lightning impulse test as an example, this paper establishes two simulation models of lightning impulse withstand voltage test and lightning impulse combined voltage test circuits with the software MATLAB/Simulink. The causes of lightning impulse overshoot and power- frequency voltage drop are analyzed. Comparisons of simulation and test show the correctness and effectiveness of these models. Then an overshoot suppression circuit and a power-frequency voltage drop suppression circuit are proposed. A new overshoot suppression circuit composed of a capacitor Cc and a resistor Rc connected in parallel. Simulation and test results show that, in a certain range, waveform front time will reduce and oscillation extent will exacerbate if Cc increases; Oscillation extent will decrease and waveform front time will be stable if Rc increases, but lightning waveform will occur a double peak phenomenon if Rc is too large. Experiments show that, to join the overshoot suppression circuit, waveform can fully meet the requirement of relevant standards, lightning wave overshoot suppression device is designed to provide a theoretical basis. The power-frequency voltage drop suppression circuit is composed of a power-frequency voltage divider and an adjustable capacitor, which can effectively work to control voltage drop.
{"title":"Research on Suppression Methods of Overshoot and Power-frequency Voltage Drop During Lightning Impulse Test of UHV Switchgear","authors":"Meng Shen, Chunmin Zhang, Bo Wang, Chen Liu, Lei Zhong, Xiaoyan Guo","doi":"10.1109/ICEPE-ST.2019.8928721","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928721","url":null,"abstract":"With the rapid development of China's UHV power grid, UHV switchgear has been widely used in UHV power system. Due to the large capacity of UHV switchgear, the overshoot and power-frequency voltage drop are also too large during lightning impulse test. This problem has become a hot issue that is widely concerned by engineers. Taking 1100kV GIS lightning impulse test as an example, this paper establishes two simulation models of lightning impulse withstand voltage test and lightning impulse combined voltage test circuits with the software MATLAB/Simulink. The causes of lightning impulse overshoot and power- frequency voltage drop are analyzed. Comparisons of simulation and test show the correctness and effectiveness of these models. Then an overshoot suppression circuit and a power-frequency voltage drop suppression circuit are proposed. A new overshoot suppression circuit composed of a capacitor Cc and a resistor Rc connected in parallel. Simulation and test results show that, in a certain range, waveform front time will reduce and oscillation extent will exacerbate if Cc increases; Oscillation extent will decrease and waveform front time will be stable if Rc increases, but lightning waveform will occur a double peak phenomenon if Rc is too large. Experiments show that, to join the overshoot suppression circuit, waveform can fully meet the requirement of relevant standards, lightning wave overshoot suppression device is designed to provide a theoretical basis. The power-frequency voltage drop suppression circuit is composed of a power-frequency voltage divider and an adjustable capacitor, which can effectively work to control voltage drop.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115531964","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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