发明名称 |
DETECTION OF GROUND FAULTS IN ENERGY SUPPLY NETWORKS WITH A COMPENSATED STAR POINT |
摘要 |
The invention relates to a method for detecting a ground fault in an electric energy supply network (10) with a compensated star point. Measurement values which characterize a state of the energy supply network (10) are detected at at least one measurement point of the energy supply network (10); a zero-sequence voltage and an admittance variable are ascertained from the measurement values; and the zero-sequence voltage and the admittance variable are used to detect the ground fault in the energy supply network (10). The aim of the invention is to increase the reliability of a ground fault detection in particular even in the event of a high-ohm ground fault. This is achieved in that the star point of the energy supply network (10) is temporarily connected to ground by activating a grounding device (13) in the presence of measurement values which indicate a ground fault in the energy supply network (10), and a ground fault is detected in the energy supply network (10) if the zero-sequence voltage exceeds a specified zero-sequence voltage threshold and the admittance variable exceeds a specified admittance threshold while the grounding device (13) is activated, the activation of the grounding device (13) causing a reduction of the zero-sequence voltage threshold. The invention also relates to a protection device (16a-c) for carrying out such a method and to a corresponding protection system. |
申请公布号 |
EP2994765(A1) |
申请公布日期 |
2016.03.16 |
申请号 |
EP20130729633 |
申请日期 |
2013.06.05 |
申请人 |
SIEMENS AKTIENGESELLSCHAFT |
发明人 |
LUKOWICZ, MIROSLAW;MICHALIK, MAREK;REBIZANT, WALDEMAR;KEREIT, MATTHIAS |
分类号 |
G01R31/02;G01R31/08 |
主分类号 |
G01R31/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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