The electromagnetic mechanism as a kind of operating mechanism has been widely used in the low-voltage contactors and circuit breakers. The objective of this paper is to propose a design method of the electromagnetic mechanism for the vacuum contactors. Both opening and closing characteristic were designed. A twice orthogonal analyses method was been used to determine the dimension parameters of mechanism within the required dimension restriction. Both the static and dynamic characteristics of the electromagnetic mechanism have been calculated by a multi-physical simulation. Moreover, the experiments were carried out to verify the validity of the simulation and the dynamic characteristic of the designed mechanism. Based on both the simulation and the experiments, a miniaturized and low-power electromagnetic mechanism for the vacuum contactors had been developed.
{"title":"Design Method of Electromagnetic Mechanism for Vacuum Contactors by Using Twice Orthogonal Analyses with Multi-Physical Simulation","authors":"Shaoweihua Liu, Liqiong Sun, Hui Ma, Yingsan Geng, Zhiyuan Liu, Jianhua Wang","doi":"10.1109/ICEPE-ST.2019.8928907","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928907","url":null,"abstract":"The electromagnetic mechanism as a kind of operating mechanism has been widely used in the low-voltage contactors and circuit breakers. The objective of this paper is to propose a design method of the electromagnetic mechanism for the vacuum contactors. Both opening and closing characteristic were designed. A twice orthogonal analyses method was been used to determine the dimension parameters of mechanism within the required dimension restriction. Both the static and dynamic characteristics of the electromagnetic mechanism have been calculated by a multi-physical simulation. Moreover, the experiments were carried out to verify the validity of the simulation and the dynamic characteristic of the designed mechanism. Based on both the simulation and the experiments, a miniaturized and low-power electromagnetic mechanism for the vacuum contactors had been developed.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"1 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":"114127177","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}
Morphology feature of contact surfaces plays an important role in the impulse breakdown voltage of vacuum gaps. However, surface roughness Ra can’t describe the morphology feature of contact surfaces effectively. Fractal geometry is an effective way to describe the irregular phenomenon of the feature of the contact surfaces in nature. The objective of this paper is to research the relationship between the morphology feature of contact surfaces and the lighting impulse breakdown voltage in vacuum gap under a non-uniform electric field with rod-plane contacts. A surface roughness Ra and a fractal dimension D were used to feature the contact surfaces morphology. In experiments, the material of the rod-plane contacts was Cu. The lighting impulse insulation characteristics of the vacuum gaps were obtained by using up-down method. The morphology features of the contact surfaces were observed by a 3D laser microscopy. The structure function method was used to estimate the fractal dimension D of the contact surfaces. The results indicate that the initial morphology feature of the contact surfaces had little effect on the impulse breakdown voltage of the vacuum gap. For one certain material, it was found that the tip surface of the cathode rod contact has the same fractal dimension D. The 50% impulse breakdown voltage U50 decreased with the increase of the rod tip surface roughness Ra after conditioning. Moreover, this relationship satisfied an approximate power law function. The research can help to understand and improve the insulation of the vacuum interrupters.
{"title":"Relationship between Morphology Feature of Contact Surfaces and Impulse Breakdown Voltage in Vacuum Gap under a Non-uniform Electric Field","authors":"Guoqin Li, Hui Ma, Jian’gang Ding, Zhiyuan Liu, Jianhua Wang, Yingsan Geng","doi":"10.1109/ICEPE-ST.2019.8928830","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928830","url":null,"abstract":"Morphology feature of contact surfaces plays an important role in the impulse breakdown voltage of vacuum gaps. However, surface roughness Ra can’t describe the morphology feature of contact surfaces effectively. Fractal geometry is an effective way to describe the irregular phenomenon of the feature of the contact surfaces in nature. The objective of this paper is to research the relationship between the morphology feature of contact surfaces and the lighting impulse breakdown voltage in vacuum gap under a non-uniform electric field with rod-plane contacts. A surface roughness Ra and a fractal dimension D were used to feature the contact surfaces morphology. In experiments, the material of the rod-plane contacts was Cu. The lighting impulse insulation characteristics of the vacuum gaps were obtained by using up-down method. The morphology features of the contact surfaces were observed by a 3D laser microscopy. The structure function method was used to estimate the fractal dimension D of the contact surfaces. The results indicate that the initial morphology feature of the contact surfaces had little effect on the impulse breakdown voltage of the vacuum gap. For one certain material, it was found that the tip surface of the cathode rod contact has the same fractal dimension D. The 50% impulse breakdown voltage U50 decreased with the increase of the rod tip surface roughness Ra after conditioning. Moreover, this relationship satisfied an approximate power law function. The research can help to understand and improve the insulation of the vacuum interrupters.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"36 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":"124945166","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.2019.8928781
Shushan Luo, Fu Wan, Yaxiong Tan, Weigen Chen, Lin Du, Han Yan
DC circuit breakers are the key equipment in maintaining safe and reliable operation of DC system. The presence of stray inductance in each branch of the hybrid DC circuit breaker generates overvoltage due to a high rate of current rise during breaking operation, which brings negative effects to the flexibility and reliability of DC system. The objective of this paper is to investigate the influence of internal stray inductance on overvoltage when the hybrid DC circuit breaker operated. The stray inductance components of main branch, transfer branch and energy consumption branch in hybrid DC breaker were analyzed and the integrated inductance of the three branches were obtained. Based on PSCAD/EMTDC, a 500kV hybrid DC circuit breaker model was established. By changing the size of stray inductance in each branch, the influence rules of stray inductance on overvoltage of circuit breaker during the breaking process were simulated and studied. The results indicate that the increased stray inductance of main branch has no obvious effect on overvoltage of hybrid DC circuit breaker during breaking process. Whereas, for transfer branch, the increased stray inductance results in a decline on overvoltage, which is unfavorable to the establishment of the breaking voltage. And the increased stray inductance of energy consumption branch extends the energy consumption time. This paper provides references for parameter design and insulation coordination of hybrid DC circuit breaker.
{"title":"Analysis on the Influence of Stray Inductance on Overvoltage of Hybrid DC Circuit Breaker During Breaking Process","authors":"Shushan Luo, Fu Wan, Yaxiong Tan, Weigen Chen, Lin Du, Han Yan","doi":"10.1109/ICEPE-ST.2019.8928781","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928781","url":null,"abstract":"DC circuit breakers are the key equipment in maintaining safe and reliable operation of DC system. The presence of stray inductance in each branch of the hybrid DC circuit breaker generates overvoltage due to a high rate of current rise during breaking operation, which brings negative effects to the flexibility and reliability of DC system. The objective of this paper is to investigate the influence of internal stray inductance on overvoltage when the hybrid DC circuit breaker operated. The stray inductance components of main branch, transfer branch and energy consumption branch in hybrid DC breaker were analyzed and the integrated inductance of the three branches were obtained. Based on PSCAD/EMTDC, a 500kV hybrid DC circuit breaker model was established. By changing the size of stray inductance in each branch, the influence rules of stray inductance on overvoltage of circuit breaker during the breaking process were simulated and studied. The results indicate that the increased stray inductance of main branch has no obvious effect on overvoltage of hybrid DC circuit breaker during breaking process. Whereas, for transfer branch, the increased stray inductance results in a decline on overvoltage, which is unfavorable to the establishment of the breaking voltage. And the increased stray inductance of energy consumption branch extends the energy consumption time. This paper provides references for parameter design and insulation coordination of hybrid DC circuit breaker.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"238 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":"131824562","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}
The objective of this paper is to determine the influence of moveable mass on the opening velocity and buffering characteristics of fast vacuum circuit breakers (FVCB) with a gas pressure buffer. A multi-physics field simulation model was built, which coupled the flow field, transient electromagnetic field, mechanical motion and external circuit. The average velocity in the first 1/3 stroke (10 mm) was defined as the opening velocity. Simulation results showed that with the increase of moveable mass from 4 to 12 kg, the opening velocity decreased following a negative exponent function from 6.13 to 3.50 m/s; the momentum at the end of 30 mm full stroke increased following a positive exponent function from 12.26 to 21.01 kg.m/s; and the work done by the buffering force decreased following quadratic function from 443.61 to 203.02 J. The relationship between buffering force and the displacement of the moveable part was described as a power function.
{"title":"Influence of Moveable Mass on the Opening Velocity and Buffering Characteristics of Fast Vacuum Circuit Breaker with a Gas Pressure Buffer","authors":"Chen Guan, Jianhua Wang, Dingyuan Peng, W. Shi, Jiali Chen, Bojian Zhang, Jing Yan, X. Yao, Zhiyuan Liu, Yingsan Geng","doi":"10.1109/ICEPE-ST.2019.8928735","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928735","url":null,"abstract":"The objective of this paper is to determine the influence of moveable mass on the opening velocity and buffering characteristics of fast vacuum circuit breakers (FVCB) with a gas pressure buffer. A multi-physics field simulation model was built, which coupled the flow field, transient electromagnetic field, mechanical motion and external circuit. The average velocity in the first 1/3 stroke (10 mm) was defined as the opening velocity. Simulation results showed that with the increase of moveable mass from 4 to 12 kg, the opening velocity decreased following a negative exponent function from 6.13 to 3.50 m/s; the momentum at the end of 30 mm full stroke increased following a positive exponent function from 12.26 to 21.01 kg.m/s; and the work done by the buffering force decreased following quadratic function from 443.61 to 203.02 J. The relationship between buffering force and the displacement of the moveable part was described as a power function.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"88 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":"134199664","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.2019.8928688
S. Xiu, Zixi Liu, Tao Liu, Rui Li, D. Feng
The transverse magnetic field (TMF) contact structure can generate a magnetic field perpendicular to the arc current flow direction to drive the vacuum arc to move on the contact surface, prevent local overheating of the contact surface and severe melting. Thereby improving the breaking capacity of the vacuum interrupter. The TMF contact has the advantages of simple structure, short current path and low cost. The motion of the arc between the TMF contacts will gradually decrease as the current drops, and eventually the arc will transit to a diffused arc before zero crossing. In this paper, the transition process from movement stage to diffusion stage was experimentally investigated. The arc appearances was analyzed. It was found that the transition process from movement stage to diffusion stage can be divided into three types: slow transition, fast transition and unstable transition.
{"title":"Transition Process of Vacuum Arc to Diffusion Stage Under Transverse Magnetic Field","authors":"S. Xiu, Zixi Liu, Tao Liu, Rui Li, D. Feng","doi":"10.1109/ICEPE-ST.2019.8928688","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928688","url":null,"abstract":"The transverse magnetic field (TMF) contact structure can generate a magnetic field perpendicular to the arc current flow direction to drive the vacuum arc to move on the contact surface, prevent local overheating of the contact surface and severe melting. Thereby improving the breaking capacity of the vacuum interrupter. The TMF contact has the advantages of simple structure, short current path and low cost. The motion of the arc between the TMF contacts will gradually decrease as the current drops, and eventually the arc will transit to a diffused arc before zero crossing. In this paper, the transition process from movement stage to diffusion stage was experimentally investigated. The arc appearances was analyzed. It was found that the transition process from movement stage to diffusion stage can be divided into three types: slow transition, fast transition and unstable transition.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"26 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":"133150495","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.2019.8928853
Ryul Hwang, I. Choi, Jae-Hong Koo, Yumi Kim, Bang-wook Lee
Sulfur hexafluoride (SF6), a greenhouse gas, is used as an insulating medium for power equipment due to its excellent insulating properties. However, as global warming and climate change become a global concern, the development of products that minimize the environmental impact is increasing, and SF6 replacement gas is being studied as an environmentally friendly alternative. Currently, there are N2, CO2, and fluorine mixed gas as substitute gas of SF6 in medium voltage classes, and research on insulation characteristic for substitute gas is actively proceeding. In this paper, we present the results of a comparative study of breakdown voltage of C5F10O/CO2 and SF6 gases under lightning impulse voltage in a sphere-to-plate electrodes arrangement. The equivalencies between breakdown voltage of SF6 and those of SF6 replacement gases with respect to pressure and percentage of SF6 and C5F10O/CO2 are presented and discussed.
{"title":"SF6 Alternative Gas Lightning Impulse Insulation Breakdown Characteristic in Medium Voltage","authors":"Ryul Hwang, I. Choi, Jae-Hong Koo, Yumi Kim, Bang-wook Lee","doi":"10.1109/ICEPE-ST.2019.8928853","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928853","url":null,"abstract":"Sulfur hexafluoride (SF6), a greenhouse gas, is used as an insulating medium for power equipment due to its excellent insulating properties. However, as global warming and climate change become a global concern, the development of products that minimize the environmental impact is increasing, and SF6 replacement gas is being studied as an environmentally friendly alternative. Currently, there are N<inf>2</inf>, CO<inf>2</inf>, and fluorine mixed gas as substitute gas of SF<inf>6</inf> in medium voltage classes, and research on insulation characteristic for substitute gas is actively proceeding. In this paper, we present the results of a comparative study of breakdown voltage of C<inf>5</inf>F<inf>10</inf>O/CO<inf>2</inf> and SF<inf>6</inf> gases under lightning impulse voltage in a sphere-to-plate electrodes arrangement. The equivalencies between breakdown voltage of SF6 and those of SF6 replacement gases with respect to pressure and percentage of SF<inf>6</inf> and C<inf>5</inf>F<inf>10</inf>O/CO<inf>2</inf> are presented and discussed.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"32 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":"132098849","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.2019.8928877
Lijun Wang, Jinwei Ma, Jing Jiang, S. Jia, Shengbin Wu, Feng Pan, Haibo Su, Yong Wang
Circuit breakers are important control and protection devices in power systems and are essential for ensuring safe and reliable operation of power systems. In recent years, the application of fast electromagnetic repulsive mechanism based on the principle of eddy current in vacuum circuit breaker has gradually become a hot research topic. However, due to the large mass of the moving mechanism and the large opening distance in the high voltage vacuum circuit breaker, it is difficult for the ordinary mechanism to break quickly. Therefore, a double-layer coil type fast electromagnetic repulsive mechanism is proposed, which can generate a larger electromagnetic repulsive force to achieve fast driving of the mechanism. Taking the 40.5kV/50kA vacuum circuit breaker as an example, the 2D finite element model was built by MAXWELL software, and its motion characteristics were simulated. In addition, the effect of the metal plate thickness, coil inner radius, number of coil turns and initial gap on the motion characteristics of the fast electromagnetic repulsive mechanism is investigated. The results show that the rise time of the electromagnetic repilsive force is very short. In contrast, the electromagnetic repilsive force has a long time to fall, and the peak value of the electromagnetic repilsive force is large. Thickening the metal plate, increasing the inner radius of the coil plate, increasing the number of coil turns and reducing the initial gap can increase the speed of the rapid electromagnetic repulsive mechanism. The simulation analysis provides a basis for further design of the electromagnetic repilsive mechanism.
{"title":"Simulation Research on Driving Technology and Influence Factors of Double-layer Coil Type Rapid Repulsive Mechanism of 40.5kV Vacuum Circuit Breaker","authors":"Lijun Wang, Jinwei Ma, Jing Jiang, S. Jia, Shengbin Wu, Feng Pan, Haibo Su, Yong Wang","doi":"10.1109/ICEPE-ST.2019.8928877","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928877","url":null,"abstract":"Circuit breakers are important control and protection devices in power systems and are essential for ensuring safe and reliable operation of power systems. In recent years, the application of fast electromagnetic repulsive mechanism based on the principle of eddy current in vacuum circuit breaker has gradually become a hot research topic. However, due to the large mass of the moving mechanism and the large opening distance in the high voltage vacuum circuit breaker, it is difficult for the ordinary mechanism to break quickly. Therefore, a double-layer coil type fast electromagnetic repulsive mechanism is proposed, which can generate a larger electromagnetic repulsive force to achieve fast driving of the mechanism. Taking the 40.5kV/50kA vacuum circuit breaker as an example, the 2D finite element model was built by MAXWELL software, and its motion characteristics were simulated. In addition, the effect of the metal plate thickness, coil inner radius, number of coil turns and initial gap on the motion characteristics of the fast electromagnetic repulsive mechanism is investigated. The results show that the rise time of the electromagnetic repilsive force is very short. In contrast, the electromagnetic repilsive force has a long time to fall, and the peak value of the electromagnetic repilsive force is large. Thickening the metal plate, increasing the inner radius of the coil plate, increasing the number of coil turns and reducing the initial gap can increase the speed of the rapid electromagnetic repulsive mechanism. The simulation analysis provides a basis for further design of the electromagnetic repilsive mechanism.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"19 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":"132169203","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.2019.8928869
Yifan Fu, M. Liao, Hao Zhang, Huaqing Dong, Xiaoli Zhang, Lu Jiang
Previous researches show that synchronous magnetic field applied in arcing time can influence the dynamic voltage distribution (DVD). However, there is a few study on the non-synchronous magnetic field control of multi-break vacuum circuit breakers (VCBs). In order to find a better method to control the non-synchronous magnetic field of multi-break VCBs in series, the Helmholtz coil was designed to generate stable magnetic field. The magnetic field distribution of the coil was simulated and analyzed in Maxwell to verify feasibility. To realize doublebreak non-synchronous control, the double-break nonsynchronous magnetic field control system was designed. The external magnetic field (EMF) experiment platform for double-break VCBs was set up. In the experiment, the applied moment and strength of EMF on each break can be adjusted by the non-synchronous magnetic field control system. By comparing the results of DVD under 7 different combinations of applied moment or strength, the effects and influence mechanism of different EMF applied to two breaks on DVD were obtained. The results of this study provide references for the design of series vacuum arc extinguishing chamber and the magnetic field control of multi-break VCBs.
{"title":"Investigation on the Influence of Non-Synchronous Magnetic Field Control on the Dynamic Voltage Distribution of Vacuum Circuit Breakers in Series","authors":"Yifan Fu, M. Liao, Hao Zhang, Huaqing Dong, Xiaoli Zhang, Lu Jiang","doi":"10.1109/ICEPE-ST.2019.8928869","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928869","url":null,"abstract":"Previous researches show that synchronous magnetic field applied in arcing time can influence the dynamic voltage distribution (DVD). However, there is a few study on the non-synchronous magnetic field control of multi-break vacuum circuit breakers (VCBs). In order to find a better method to control the non-synchronous magnetic field of multi-break VCBs in series, the Helmholtz coil was designed to generate stable magnetic field. The magnetic field distribution of the coil was simulated and analyzed in Maxwell to verify feasibility. To realize doublebreak non-synchronous control, the double-break nonsynchronous magnetic field control system was designed. The external magnetic field (EMF) experiment platform for double-break VCBs was set up. In the experiment, the applied moment and strength of EMF on each break can be adjusted by the non-synchronous magnetic field control system. By comparing the results of DVD under 7 different combinations of applied moment or strength, the effects and influence mechanism of different EMF applied to two breaks on DVD were obtained. The results of this study provide references for the design of series vacuum arc extinguishing chamber and the magnetic field control of multi-break VCBs.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"74 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":"132241431","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.2019.8928804
Haonan Sun, H. Joo, Yi Wu, M. Rong, C. Bae, Young-geun Kim
During the interruption, the separation of the contacts plays an important role in different kinds of switch gears since the arc motion or the arc elongation will be affected. The movement of the contact could increase the arc length and then decide the arc behavior. In reverse, the arc current will be changed during the interruption and the Lorentz force will then influence the movement of the contact. It is necessary to consider this phenomenon to make the arc simulation more accurate and universal. In this work, low voltage arc plasma simulation in 3D with contact opening process has been established. Both the sheath and nonlinear magnetic material were taken into consideration. Calculation was based on magneto-hydrodynamic arc model, and a method of coupling different software to separately calculate fluid and electromagnetic field has been developed to fulfill the requirements above. Furthermore, a low voltage circuit breaker has been tested to validate the simulation with U-I characteristics.
{"title":"Calculation of the Switch Arc in Low Voltage Circuit Breaker Considering the Interaction Between the Contact Movement and the Arc Force","authors":"Haonan Sun, H. Joo, Yi Wu, M. Rong, C. Bae, Young-geun Kim","doi":"10.1109/ICEPE-ST.2019.8928804","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928804","url":null,"abstract":"During the interruption, the separation of the contacts plays an important role in different kinds of switch gears since the arc motion or the arc elongation will be affected. The movement of the contact could increase the arc length and then decide the arc behavior. In reverse, the arc current will be changed during the interruption and the Lorentz force will then influence the movement of the contact. It is necessary to consider this phenomenon to make the arc simulation more accurate and universal. In this work, low voltage arc plasma simulation in 3D with contact opening process has been established. Both the sheath and nonlinear magnetic material were taken into consideration. Calculation was based on magneto-hydrodynamic arc model, and a method of coupling different software to separately calculate fluid and electromagnetic field has been developed to fulfill the requirements above. Furthermore, a low voltage circuit breaker has been tested to validate the simulation with U-I characteristics.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"283 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":"132569553","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}
The objective of this paper is to experimentally determine the vacuum arc current transfer characteristics of a novel AMF-TMF contact under different opening velocities. The novel AMF-TMF contact consists of a pair of inner movable TMF contacts and a pair of outer fixed AMF contacts. Contact diameter of the outer AMF contact was 85 mm, and the material of inner and outer contacts were all CuCr25 (25% Cr). Arc current transfer characteristics were obtained from the drawn arc experiments carried out in an L-C discharging circuit. Arcing current was up to 20 kA rms. Opening velocity of the inner movable contact was set as 1.60, 1.75 and 1.90 m/s. From the results, the peak value of current transferred to outer AMF contact and the charge transfer in outer AMF contact both increased with the increasing of opening velocity of inner movable contact. When arc current level was 20 kA rms, opening velocity was 1.9 m/s, and upper contact worked as anode, the charge transfer in outer AMF contact got its maximum value and reached 23.0% of the charge transfer in the whole contact system.
本文的目的是实验确定一种新型AMF-TMF触点在不同打开速度下的真空电弧电流传递特性。该新型AMF-TMF触点由一对内活动的TMF触点和一对外固定的AMF触点组成。AMF外触点接触直径为85 mm，内外触点材料均为CuCr25 (25% Cr)。通过在L-C放电电路中进行的引弧实验，得到了电弧电流传递特性。电弧电流可达20 kA rms。内活动触点开启速度分别设置为1.60、1.75和1.90 m/s。结果表明，随着内动触点开启速度的增加，传递到外动触点的电流峰值和外动触点的电荷传递量均有所增加。当电弧电流水平为20 kA rms，开启速度为1.9 m/s，上触点作为阳极时，外触点的电荷转移量最大，达到整个触点系统电荷转移量的23.0%。
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