COMBINED SHUNT AND MULTI-SEGMENTED ROGOWSKI-COIL CURRENT SENSOR
A current sensor configured to measure current in a current-carrying conductor. The current sensor includes a shunt configured to be placed in series with the current-carrying conductor, and a Rogowski coil including at least one conductor segment. The shunt and the Rogowski coil are coupled to produce an output signal representing the current in the current-carrying conductor.
1 . A current sensor configured to measure current in a current-carrying conductor, the current sensor comprising:
a shunt configured to be placed in series with the current-carrying conductor; and
a Rogowski coil including at least one conductor segment;
in which the shunt and the Rogowski coil are coupled to produce an output signal representing the current in the current-carrying conductor.
2 . The current sensor of claim 1 , further comprising a pair of sense leads coupled to the shunt, in which a conductor segment of the Rogowski coil is coupled to one of the sense leads.
3 . The current sensor of claim 1 , further comprising an integrator element configured to receive an output from a conductor segment of the Rogowski coil
4 . The current sensor of claim 3 , in which the integrator element comprises a compensating pole filter.
5 . The current sensor of claim 1 , in which the Rogowski coil includes a plurality of conductor segments.
6 . The current sensor of claim 5 , in which a first conductor segment is electrically isolated from a second conductor segment.
7 . The current sensor of claim 5 , further comprising an individual integrator element for each conductor segment of the plurality of conductor segments.
8 . The current sensor of claim 7 , in which each individual integrator element comprises a compensating pole filter.
9 . The current sensor of claim 7 , further comprising a summing element configured to produce a sum of outputs of the individual integrator elements.
10 . The current sensor of claim 5 , further comprising an integrator element configured to receive an output from more than one conductor segment of the plurality of conductor segments.
11 . The current sensor of claim 10 , in which the integrator element comprises a compensating pole filter.
12 . The current sensor of claim 1 , in which a conductor segment of the Rogowski coil at least partially encompasses the shunt.
13 . The current sensor of claim 1 , further comprising an individual buffer element for each conductor segment of the Rogowski coil.
14 . The current sensor of claim 13 , further comprising an integrator element configured to receive an output from one or more individual buffer elements.
15 . The current sensor of claim 14 , in which the integrator element comprises a compensating pole filter.
16 . The current sensor of claim 1 , further comprising a probe connector for electrically and mechanically coupling the current sensor to a test and measurement probe.
17 . The current sensor of claim 1 , further comprising an instrument connector for electrically and mechanically coupling the current sensor to a test and measurement instrument.
18 . The current sensor of claim 1 , in which a first conductor segment of the Rogowski coil has an inductance different than an inductance of a second conductor segment.
19 . The current sensor of claim 1 , in which a first conductor segment of the Rogowski coil has an optimized current measurement frequency range different than an optimized current measurement frequency range of a second conductor segments.
20 . A current sensor configured to measure current in a current-carrying conductor, the current sensor comprising a Rogowski coil having a plurality of conductor segments, the plurality of conductor segments positionable to form a substantially complete loop around the current-carrying conductor.