发明名称 |
NEUTRAL GROUNDING RESISTOR MONITOR |
摘要 |
A device for monitoring a neutral grounding resistor (NGR), including first and second NGRs electrically connected in parallel, a rectifier circuit electrically connected in series with the second NGR and a voltage source and a logic resistor electrically connected in series with the second NGR. A logic circuit measures current passing through the logic resistor and determines the resistance of the first NGR based on the measured current and the resistance of the second NGR. As such, a failed-open or failed-short condition of the first NGR may be identified based at least in part on the determined resistance of the first NGR. |
申请公布号 |
EP2837076(A1) |
申请公布日期 |
2015.02.18 |
申请号 |
EP20130775142 |
申请日期 |
2013.04.11 |
申请人 |
LITTELFUSE, INC. |
发明人 |
VANGOOL, MICHAEL P.;BAKER, GEOFFREY J. |
分类号 |
H02H3/16;G01R31/02;H02H3/26;H02H5/10 |
主分类号 |
H02H3/16 |
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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