发明名称 |
SYSTEM AND METHOD FOR MONITORING CURRENT DRAWN BY A PROTECTED LOAD IN A SELF-POWERED ELECTRONIC PROTECTION DEVICE |
摘要 |
A circuit for measuring current is drawn by a self-powered electronic protection device. The circuit monitors current in a polyphase alternating current (AC) power source by measuring current in a rectified secondary winding of a current transformer coupled to a phase current of the power source. The measurement circuit includes a measurement burden connected between the cathode of the current transformer rectifier and a switch. Closing the switch references the voltage drop across the measurement burden to a reference potential. A controller closes the switch while receiving measurements of the voltage drop. Because the voltage drop is referenced to a reference potential, it can be analyzed in a controller to detect a fault condition without being conditioned with an inverting amplifier or a difference amplifier. |
申请公布号 |
CA2823565(A1) |
申请公布日期 |
2012.07.19 |
申请号 |
CA20122823565 |
申请日期 |
2012.01.09 |
申请人 |
SCHNEIDER ELECTRIC USA, INC. |
发明人 |
JEFFERIES, KEVIN |
分类号 |
G01R15/18;H02H1/06 |
主分类号 |
G01R15/18 |
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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