发明授权
- 专利标题: Protective device having a circuit breaker, in particular a low-voltage circuit breaker
- 专利标题(中): 具有断路器的保护装置,特别是低压断路器
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申请号: US12223122申请日: 2006-12-27
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公开(公告)号: US08149550B2公开(公告)日: 2012-04-03
- 发明人: Henry Franke , Jeffery C. Mizener , Ilka Redmann
- 申请人: Henry Franke , Jeffery C. Mizener , Ilka Redmann
- 申请人地址: DE Munich
- 专利权人: Siemens Aktiengesellschaft
- 当前专利权人: Siemens Aktiengesellschaft
- 当前专利权人地址: DE Munich
- 代理机构: Harness, Dickey & Pierce, P.L.C.
- 优先权: DE102006004800 20060123
- 国际申请: PCT/EP2006/070218 WO 20061227
- 国际公布: WO2007/082631 WO 20070726
- 主分类号: H02H3/00
- IPC分类号: H02H3/00
摘要:
A protective device is disclosed having a circuit breaker for an electrical connection between a transformer and a load, wherein an overcurrent device is arranged between the transformer and the load. The overcurrent device has first magnetoelectric transducers arranged at each phase conductor and the neutral conductor, wherein the overcurrent device uses the transducer currents to in each case establish the presence of a first ground-fault current, and wherein the circuit breaker has a switching device, which interrupts at least the phase conductors between the transformer and the load in the event of the presence of a first ground-fault current (unrestricted earth fault). In order to also be able to determine the ground fault current between the transformer and the circuit breaker, at least one embodiment of the invention proposes providing in each case second magnetoelectric transducers at each phase conductor, the neutral conductor and a star-point conductor which is connected to the star point, using the transducer currents of the second transducer in each case to determine the presence of a second ground-fault current (restricted earth fault), and forming a signal for disconnecting the transformer in the event of the presence of a second ground-fault current.
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