Power line sensor
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Accused Products
Abstract
An apparatus for sensing the current in a power line of a power system and systems incorporating the apparatus are disclosed. The apparatus may comprise an enclosure providing a window operable to permit the passage of the power line therethrough. The apparatus may further comprise an active current transformer set within the enclosure and operative to produce a scaled version of the current. The apparatus may further comprise an amplifier coupled with the active current transformer and operative to reduce the phase shift and ratio error between the current and the scaled version of the current. The apparatus may further comprise a powering current transformer set within the enclosure and operative to receive power from the power line on a primary winding and deliver power on a secondary winding. The apparatus may further comprise power supply circuitry set within the enclosure, the power supply circuitry powered through the secondary winding from the powering current transformer and operative to supply power to the amplifier. The apparatus may further comprise at least one of secondary leads and secondary terminals extending from the enclosure, coupled with the active current transformer and operative to deliver the scaled version of the current outside of the enclosure.
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Citations
125 Claims
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1-84. -84. (canceled)
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85. An apparatus for sensing the current in a power line of a power system, the apparatus comprising:
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an enclosure providing a window operable to permit passage of said power line therethrough;
an active current transformer set within said enclosure and operative to produce a scaled version of said current;
a compensation circuit coupled with said active current transformer and operative to compensate for magnetic losses in said active current transformer;
a powering current transformer set within said enclosure and operative to receive power from said power line on a primary winding and deliver power on a secondary winding; and
power supply circuitry set within said enclosure and coupled with said secondary winding, said power supply circuitry operative to supply regulated power to power said compensation circuit as a function of power received from said secondary winding. - View Dependent Claims (86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108)
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109. An apparatus for sensing the current in a power line of a power system, the apparatus comprising:
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an enclosure providing a window operable to permit passage of said power line therethrough;
an active current transformer set within said enclosure and operative to produce a scaled version of said current;
said current containing frequency components substantially within a first range of frequencies;
a compensation circuit coupled with said active current transformer and operative to reduce a phase shift and ratio error between said current and said scaled version of said current;
a powering current transformer set within said enclosure and operative to receive power from said power line on a primary winding and deliver power on a secondary winding; and
power supply circuitry set within said enclosure, said power supply circuitry operative to extract power from a power source within a second range of frequencies, said power supply circuitry further operative to supply regulated power to power said compensation circuit. - View Dependent Claims (110, 111, 112, 113, 114, 115)
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116. A method of sensing current in a power line of a power system, the method comprising:
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receiving a primary current from a power line on a primary winding of a powering current transformer;
delivering power on a secondary winding of said power current transformer, said delivered power comprising a supply voltage and a supply current;
producing a scaled version of said primary current with an active current transformer;
compensating for magnetic losses in said active current transformer with a compensation circuit; and
supplying regulated power with a power supply circuit to power said compensation circuit, said power supply circuit coupled with said secondary winding and supplied said supply voltage and said supply current therefrom. - View Dependent Claims (117, 118, 119, 120, 121, 122, 123, 124, 125)
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Specification