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.2019.8928889
Hyun Woo Kim
A high voltage circuit breaker was mainly used to prevent accidents that may occur during transmission and distribution. The specifications of circuit breaker and energy of mechanism were decided by voltage and current level. It is important to satisfy electric and mechanical performance of circuit breaker. In mechanical performance, the reliability of circuit breaker is related to the IEC 62271-102 standards. The mechanical endurance of interrupter is M2 class and the number of operating cycles is 10,000. In past, the repeated tests were performed to satisfy the reliability of circuit breaker, so the time and cost were very high. To reduce the time and cost, there were many studies that predict the dynamic behavior and reliability of circuit breaker. In this study, the dynamic loads were measured to analyze 550kV circuit breaker. The multibody dynamic analysis models were developed by using RecurDyn program. And the simulation results were validated with experimental results. The fatigue analysis and evaluation were executed by using simulation and experimental results.
{"title":"Fatigue Evaluation and Flexible Multibody Dynamic Analysis of 550kV High Voltage Circuit Breaker","authors":"Hyun Woo Kim","doi":"10.1109/ICEPE-ST.2019.8928889","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928889","url":null,"abstract":"A high voltage circuit breaker was mainly used to prevent accidents that may occur during transmission and distribution. The specifications of circuit breaker and energy of mechanism were decided by voltage and current level. It is important to satisfy electric and mechanical performance of circuit breaker. In mechanical performance, the reliability of circuit breaker is related to the IEC 62271-102 standards. The mechanical endurance of interrupter is M2 class and the number of operating cycles is 10,000. In past, the repeated tests were performed to satisfy the reliability of circuit breaker, so the time and cost were very high. To reduce the time and cost, there were many studies that predict the dynamic behavior and reliability of circuit breaker. In this study, the dynamic loads were measured to analyze 550kV circuit breaker. The multibody dynamic analysis models were developed by using RecurDyn program. And the simulation results were validated with experimental results. The fatigue analysis and evaluation were executed by using simulation and experimental results.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"22 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":"114263461","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.2019.8928686
Xiaomin Zhao, Mingfei Wang, Yi Wu, Yuang Xiao, Yife Wu, Xiao Gu, Wenkui Liu
The repulsive mechanism has the advantages of short response time, fast opening speed and simple structure, and fully matches the short circuit breaking of the DC system to quickly establish the insulation gap, widely used in medium voltage DC circuit breakers. In this paper, a bistable permanent magnet repulsive mechanism of 10kV DC circuit breaker is proposed. The magnetostatic research is carried out for the permanent magnet holding mechanism and the repulsive mechanism, and based on the research results, the experimental prototype is built and the prototype experiment is completed. The reliability of the function of bistable permanent magnet repulsion mechanism is verified by the experiment. According to the breaking demand of 10kV DC circuit breaker, the overall design scheme of a bistable permanent magnet repulsive mechanism is proposed. According to the theory of electromagnetic field, the magnetostatic model and dynamic model of the permanent magnet mechanism are built. The influence of key structural parameters on the static retention characteristics is studied, and the structural parameters of the permanent magnet mechanism are determined. Based on the parameters calculated by the simulation, an experimental prototype of the bistable permanent magnet repulsive mechanism is built. The experimental scheme of the rated opening test and the rapid opening test is designed, and the prototype rated breaking curve, the quick opening response time curve and the quick opening characteristic curve are obtained. Comparing the experimental results with the requirements of the circuit breaker, the breaking characteristics of the repulsive mechanism can meet the two breaking requirements of the rated breaking and short-circuit breaking of the circuit breaker, and verify the feasibility of the prototype of the repulsive mechanism. The simulation results and experimental results verify the accuracy and practicability of the simulation model within an acceptable error range.
{"title":"Design of Bistable Permanent Magnet-Repeat Mechanism for Medium Voltage DC High Speed Switch","authors":"Xiaomin Zhao, Mingfei Wang, Yi Wu, Yuang Xiao, Yife Wu, Xiao Gu, Wenkui Liu","doi":"10.1109/ICEPE-ST.2019.8928686","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928686","url":null,"abstract":"The repulsive mechanism has the advantages of short response time, fast opening speed and simple structure, and fully matches the short circuit breaking of the DC system to quickly establish the insulation gap, widely used in medium voltage DC circuit breakers. In this paper, a bistable permanent magnet repulsive mechanism of 10kV DC circuit breaker is proposed. The magnetostatic research is carried out for the permanent magnet holding mechanism and the repulsive mechanism, and based on the research results, the experimental prototype is built and the prototype experiment is completed. The reliability of the function of bistable permanent magnet repulsion mechanism is verified by the experiment. According to the breaking demand of 10kV DC circuit breaker, the overall design scheme of a bistable permanent magnet repulsive mechanism is proposed. According to the theory of electromagnetic field, the magnetostatic model and dynamic model of the permanent magnet mechanism are built. The influence of key structural parameters on the static retention characteristics is studied, and the structural parameters of the permanent magnet mechanism are determined. Based on the parameters calculated by the simulation, an experimental prototype of the bistable permanent magnet repulsive mechanism is built. The experimental scheme of the rated opening test and the rapid opening test is designed, and the prototype rated breaking curve, the quick opening response time curve and the quick opening characteristic curve are obtained. Comparing the experimental results with the requirements of the circuit breaker, the breaking characteristics of the repulsive mechanism can meet the two breaking requirements of the rated breaking and short-circuit breaking of the circuit breaker, and verify the feasibility of the prototype of the repulsive mechanism. The simulation results and experimental results verify the accuracy and practicability of the simulation model within an acceptable error range.","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":"114221684","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.2019.8928892
Baiqiang Li, Shaohua Ma, Z. Cai, Yahong Zheng
Reliable calculation model of electromagnetic mechanism characteristics of DC contactor is of great significance to its structural optimization. In this paper, the excitation process of contactor magnet is summarized, and a new calculation model of hysteresis-finite element method is proposed. It can effectively calculate the remanence of the electromagnetic mechanism under different excitation conditions, and give the relationship curve between the remanence flux and the anti-remanence gap.
{"title":"A Novel Method for Calculating Residual Magnetic Flux of DC Contactors","authors":"Baiqiang Li, Shaohua Ma, Z. Cai, Yahong Zheng","doi":"10.1109/ICEPE-ST.2019.8928892","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928892","url":null,"abstract":"Reliable calculation model of electromagnetic mechanism characteristics of DC contactor is of great significance to its structural optimization. In this paper, the excitation process of contactor magnet is summarized, and a new calculation model of hysteresis-finite element method is proposed. It can effectively calculate the remanence of the electromagnetic mechanism under different excitation conditions, and give the relationship curve between the remanence flux and the anti-remanence gap.","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":"116085052","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%。
{"title":"Comparison of Vacuum Arc Current Transfer Characteristics of a Novel AMF-TMF Contact under Different Opening Velocities","authors":"Zihan Wang, Yuanzhao Li, Qifeng Zhang, Hui Ma, Jianhua Wang, Yingsan Geng, Zhiyuan Liu","doi":"10.1109/ICEPE-ST.2019.8928925","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928925","url":null,"abstract":"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.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"27 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":"116225099","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.2019.8928902
Ziying Zhang, Miaozhong Cai, J. Zou, Zhihui Huang, Ruitong Liu
For HVDC vacuum circuit breaker based on commutation principle, the commutation parameter is the key factor influencing the interrupting performance. In this paper, the DC breaking process is simulated by PSCAD/EMTDC and the result shows that the higher the commutation frequency and the breaking current amplitude, the higher the arc current decline rate is. The commutation parameter and interrupting performance of a DC vacuum breaker prototype are tested through a synthetic DC test circuit. The initial moment of commutation time and the safe stroke of the system are determined. The experimental result shows that when the commutation frequency and the amplitude ratio of breaking current to commutation current are constant, the commutation time is not affected by the breaking current amplitude, but the arc current decline rate increases with the increase of breaking current amplitude. High commutation frequency will make it difficult to break even reignite the arc. What’s more, a high commutation current will result in the higher TRV to the gap, when the breaking current is 5 kA and the commutation current is 8 kA, there will generate a 6 kV recovery voltage at the break, leading to arc reigniting.
{"title":"Experimental Study on Commutation Parameter of HVDC Vacuum Circuit Breaker","authors":"Ziying Zhang, Miaozhong Cai, J. Zou, Zhihui Huang, Ruitong Liu","doi":"10.1109/ICEPE-ST.2019.8928902","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928902","url":null,"abstract":"For HVDC vacuum circuit breaker based on commutation principle, the commutation parameter is the key factor influencing the interrupting performance. In this paper, the DC breaking process is simulated by PSCAD/EMTDC and the result shows that the higher the commutation frequency and the breaking current amplitude, the higher the arc current decline rate is. The commutation parameter and interrupting performance of a DC vacuum breaker prototype are tested through a synthetic DC test circuit. The initial moment of commutation time and the safe stroke of the system are determined. The experimental result shows that when the commutation frequency and the amplitude ratio of breaking current to commutation current are constant, the commutation time is not affected by the breaking current amplitude, but the arc current decline rate increases with the increase of breaking current amplitude. High commutation frequency will make it difficult to break even reignite the arc. What’s more, a high commutation current will result in the higher TRV to the gap, when the breaking current is 5 kA and the commutation current is 8 kA, there will generate a 6 kV recovery voltage at the break, leading to arc reigniting.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"43 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":"115403345","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：