The present research on moulded case circuit breaker（MCCB） focuses on the enhancement of current-limiting interrupting performance during short circuit, overload, under voltage and phase failure, involving electrics...The present research on moulded case circuit breaker（MCCB） focuses on the enhancement of current-limiting interrupting performance during short circuit, overload, under voltage and phase failure, involving electrics, magnetic, mechanics, thermal, material, friction, arc extinguishing, impact vibration, skin effect, etc. The rigid-flexible coupling of the parts and components of the metamorphic manipulating mechanism in multi-fields leads to the non-rigid, high frequency, high damping, singularity of the Euler-Lagrange equations which represents the multi-body dynamics. The small step iteration which is used for obtaining the instantaneous and short time critical interrupting performance of metamorphic mechanism appears inaccuracy. It is difficult to realize top-down design by existing CAD systems. Therefore, a metamorphic manipulating mechanism design method for MCCB using index reduced iteration（IRI） is put forward. The metamorphic manipulating mechanism of MCCB is decomposed into three mechanisms： main switch connector mechanism, electromagnet-drawbar-jump buckle mechanism, and bimetallic strip-drawbar mechanism, which is respectively described by electro-dynamic force, electromagnet force, and bimetallic strip force. The dummy part（virtual rigid） without moment of inertia and mass is employed as intermediate to join the flexible body and rigid body. The model of rigid-flexible coupling metamorphic mechanism multi-body dynamics is built. The differential algebraic equations（DAEs） of the multibody dynamics model are converted to pure ordinary differential equations（ODEs） by coordinate partition. Order reduced integration with multi-step and variable step-size is preceded based on IRI. The non-linear algebraic equations are solved in each integration step by Newton-Rapson iteration. There is no ill-condition and singularity of Jacobian matrix when step size reduces to zero. The independent prototype design system using ACIS R13, HOOPS V11.0 and Visual C＋＋.NET 2003 has been developed, which verifies the effectiveness of the proposed method. The proposed method enhances the current-limiting interrupting performance of MCCB, and has reference significance for multi-body dynamics design for similar flexible metamorphic mechanisms in multi-fields.展开更多
塑壳断路器(MCCB)通常采用栅片灭弧系统来熄灭电弧,通过将故障电弧分割成很多段小的电弧,利用交流电弧的近阴极效应,从而增加电弧的电压来使故障电流强制减零最终熄灭电弧。设计上通常的做法主要是提高触头开距以及增加灭弧栅片两种方式...塑壳断路器(MCCB)通常采用栅片灭弧系统来熄灭电弧,通过将故障电弧分割成很多段小的电弧,利用交流电弧的近阴极效应,从而增加电弧的电压来使故障电流强制减零最终熄灭电弧。设计上通常的做法主要是提高触头开距以及增加灭弧栅片两种方式,但这也会带来产品尺寸及成本的增加。文中在保持160A塑壳断路器灭弧系统尺寸不变的情况下,改变灭弧栅片V型槽深度及表面镀层,并借助ANSYS耦合分析50 k A分断过程中电弧运动的过程,选出其中最优的方案。最后通过样机试验与模拟分析比较基本吻合,为后续类似产品的设计提供指导。展开更多
基金supported by National Basic Research Program of China(973 Program, Grant No. 2011CB706506)National S&T Great Special of China(Grant Nos. 2012ZX04010011, 2011ZX04014-131)+1 种基金National Science Foundation for Young Scholars of China(Grant No. 51005204)Postdoctoral Fund of China(Grant No. 20100471000)
文摘The present research on moulded case circuit breaker（MCCB） focuses on the enhancement of current-limiting interrupting performance during short circuit, overload, under voltage and phase failure, involving electrics, magnetic, mechanics, thermal, material, friction, arc extinguishing, impact vibration, skin effect, etc. The rigid-flexible coupling of the parts and components of the metamorphic manipulating mechanism in multi-fields leads to the non-rigid, high frequency, high damping, singularity of the Euler-Lagrange equations which represents the multi-body dynamics. The small step iteration which is used for obtaining the instantaneous and short time critical interrupting performance of metamorphic mechanism appears inaccuracy. It is difficult to realize top-down design by existing CAD systems. Therefore, a metamorphic manipulating mechanism design method for MCCB using index reduced iteration（IRI） is put forward. The metamorphic manipulating mechanism of MCCB is decomposed into three mechanisms： main switch connector mechanism, electromagnet-drawbar-jump buckle mechanism, and bimetallic strip-drawbar mechanism, which is respectively described by electro-dynamic force, electromagnet force, and bimetallic strip force. The dummy part（virtual rigid） without moment of inertia and mass is employed as intermediate to join the flexible body and rigid body. The model of rigid-flexible coupling metamorphic mechanism multi-body dynamics is built. The differential algebraic equations（DAEs） of the multibody dynamics model are converted to pure ordinary differential equations（ODEs） by coordinate partition. Order reduced integration with multi-step and variable step-size is preceded based on IRI. The non-linear algebraic equations are solved in each integration step by Newton-Rapson iteration. There is no ill-condition and singularity of Jacobian matrix when step size reduces to zero. The independent prototype design system using ACIS R13, HOOPS V11.0 and Visual C＋＋.NET 2003 has been developed, which verifies the effectiveness of the proposed method. The proposed method enhances the current-limiting interrupting performance of MCCB, and has reference significance for multi-body dynamics design for similar flexible metamorphic mechanisms in multi-fields.
文摘塑壳断路器(MCCB)通常采用栅片灭弧系统来熄灭电弧,通过将故障电弧分割成很多段小的电弧,利用交流电弧的近阴极效应,从而增加电弧的电压来使故障电流强制减零最终熄灭电弧。设计上通常的做法主要是提高触头开距以及增加灭弧栅片两种方式,但这也会带来产品尺寸及成本的增加。文中在保持160A塑壳断路器灭弧系统尺寸不变的情况下,改变灭弧栅片V型槽深度及表面镀层,并借助ANSYS耦合分析50 k A分断过程中电弧运动的过程,选出其中最优的方案。最后通过样机试验与模拟分析比较基本吻合,为后续类似产品的设计提供指导。
