发明名称 |
Method and apparatus for three-phase sensing using two current transformers |
摘要 |
A method and apparatus is disclosed for complete three-phase sensing using two current transformers. Two phases of a three-phase system are used as the primary windings in each current transformer such that each current transformer produces a phasor representation of a sum of the two phases. A three phase sensor is provided to add the phasor representations produced by each of the current transformers and to produce a third phasor representation from the summation. The three phasor representations can then be applied to any conventional overload relay control to monitor each phase and produces a trip signal to open the three-phase system when a phasor representation exceeds some predetermined value, or the magnitudes of the phasors differ by more than a predefined value.
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申请公布号 |
US5815357(A) |
申请公布日期 |
1998.09.29 |
申请号 |
US19970831621 |
申请日期 |
1997.04.09 |
申请人 |
EATON CORPORATION |
发明人 |
INNES, MARK E.;BLAKELY, JOHN H. |
分类号 |
G01R19/10;G01R31/02;H02H1/00;H02H3/08;(IPC1-7):H02H3/00 |
主分类号 |
G01R19/10 |
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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