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公开(公告)号：US20170219639A1
公开(公告)日：2017-08-03
申请号：US15420078
申请日：2017-01-30
申请人： Landis+Gyr, Inc.
CPC分类号： G01R22/066 , G01R15/146 , G01R35/00
摘要： A method detects an error in a meter having a current transformer, a burden resistor unit and a resistive path switchably connectable across the burden resistor unit. The method includes obtaining in the processing circuit a first value representative of the voltage magnitude across the burden resistor unit while the resistive path is operably decoupled across the burden resistor unit. The method also includes closing a switching element to operably couple the resistive path across the burden resistor unit, and obtaining in a processing circuit a second value representative of a voltage magnitude across the burden resistor unit. The method further includes determining in the processing circuit whether an error exists based on the first value, the second value, and at least one predetermined stored value.
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公开(公告)号：US20170219633A1
公开(公告)日：2017-08-03
申请号：US15484952
申请日：2017-04-11
申请人： Landis+Gyr Inc.
IPC分类号： G01R15/18
CPC分类号： G01R15/185 , G01R15/181
摘要： A sensor includes a core, first and second windings, an integrating amplifier circuit and a DC stabilization circuit. The first and second windings are wrapped around the core. The integrating amplifier circuit has a first input coupled to receive a sensed current from the first winding, and an output operably coupled to provide a current the second winding. The integrating amplifier circuit is configured to generate a phase shift from an input current received at the first input and the current provided to the second winding. The DC stabilization circuit includes a first resistive path coupled between the output of the integrating amplifier circuit and the first input of the integrating amplifier circuit, and a second resistive path coupled between the first winding and the first input of the integrating amplifier circuit.
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