Shunt sensor and shunt sensor assembly
The present disclosure describes configurations for current shunt sensors and current shunt sensor assemblies having improved electromagnetic cross-talk rejection that can be used in single-phase/split-phase and poly-phase power metering applications. Some embodiments of the current shunt sensors and current shunt sensor assemblies reduce the need for a shielding material around current shunt sensors in single-phase/split-phase and poly-phase power metering applications. Some embodiments of the current shunt sensors achieve improved electromagnetic cross-talk rejection through a substantially symmetrical arrangement of component parts along the primary path of current flow. Some embodiments of the current shunt sensors achieve improved electromagnetic cross-talk rejection by symmetrical configurations that, in operation, induce complementary parasitic currents or voltages that substantially cancel each other out and do not substantially affect primary current flow through the current shunt sensor.
1. A current shunt sensor, comprising:
first and second conductive mounting elements, each having respective first and second ends;
a resistor between the respective first ends of the first and second conductive mounting elements,
wherein first surfaces of each of the first and second conducting mounting elements and the resistor are coplanar, wherein second surfaces of each of the first and second conducting mounting elements and the resistor are coplanar, wherein the first and second surfaces are opposing surfaces and are defined in part by a central lengthwise axis, wherein the resistor is defined by a second axis substantially perpendicular to the central lengthwise axis and to third and fourth opposing surfaces of each of the first and second conducting mounting elements and the resistor, and wherein the respective first and second ends and the resistor are symmetric along the central lengthwise axis;
first and second measurement connections on the third surfaces of the first and second mounting elements, respectively, on a first side of the central lengthwise axis, and on respective opposing sides of the second axis; and
third and fourth measurement connections on the fourth surfaces of the first and second mounting elements, respectively, on a second side of the central lengthwise axis, and on the respective opposing sides of the second axis.
2. The current shunt sensor of claim 1 , wherein the first and second measurement connections are equidistant from the second axis, and the third and fourth measurement connections are equidistant from the second axis.
3. The current shunt sensor of claim 1 , wherein the resistor comprises at least one of Manganin and Constantin.
4. The current shunt sensor of claim 1 , wherein the first and second conductive mounting elements and the resistor are symmetrical along the second axis.
5. The current shunt sensor of claim 1 , wherein the third surfaces are coplanar, and wherein the fourth surfaces are coplanar.
6. The current shunt sensor of claim 1 , wherein the first and third measurement connections are equidistant from the central lengthwise axis, and wherein the second and fourth measurement connections are equidistant from the central lengthwise axis.
7. The current shunt sensor of claim 1 , wherein the first, second, third, and fourth measurement connections are located adjacent to respective corners of the first and second surfaces of the resistor.