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System and method for expanding measurement bandwidth of Rogowski coil current sensor

A technology of current sensors and Rogowski coils, which is applied in the direction of measuring devices, only measuring current, measuring electrical variables, etc., can solve the problems of increasing the parasitic capacitance and inductance parameters of Rogowski coils, reducing the measurement bandwidth of Rogowski coils, etc.

Pending Publication Date: 2022-05-27
WUHAN UNIV
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Problems solved by technology

However, these measures will also increase the parasitic capacitance and inductance parameters inside the Rogowski coil, thus reducing the measurement bandwidth of the Rogowski coil

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  • System and method for expanding measurement bandwidth of Rogowski coil current sensor
  • System and method for expanding measurement bandwidth of Rogowski coil current sensor
  • System and method for expanding measurement bandwidth of Rogowski coil current sensor

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Embodiment Construction

[0040] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0041] 1) Three common Rogowski coils with circular skeletons are selected as specific examples. The Rogowski coils of the three circular skeletons are a single-layer winding Rogowski coil without shielding layer (Coil A1), a double-layer winding Rogowski coil without shielding layer (CoilB1, the number of winding turns in each layer is equal) and a shielded Rogowski coil. Single layer wound Rogowski coil (Coil A2). The parameters of Coil A1, Coil B1 and Coil A2 are shown in Table 1. To avoid forming a current path on the shield, only one end (reference potential) of the coil Coil A2 is ...

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Abstract

The invention discloses a system and method for expanding the measurement bandwidth of a Rogowski coil current sensor, and the system is characterized in that the output of each sub-coil is connected with a voltage follower, and the dotted terminal of each sub-coil is connected with the grounding terminal of the corresponding voltage follower; the number of the input ends of the multi-path input summator is the same as that of the summators, and the output end and the grounding end of each voltage follower are respectively connected with one input end and one grounding end of the multi-path input summator. Parasitic parameters of an original Rogowski coil are reduced in the mode that the original Rogowski coil is divided into a plurality of sub-coils, each sub-coil is connected with a voltage follower, and induced voltages, output by the voltage followers, of the sub-coils are added through an adder and then output. The measurement bandwidth of the Rogowski coil current sensor can be expanded by multiple times on the premise that the sensitivity, the anti-electromagnetic interference capability and the coil appearance size of the Rogowski coil current sensor are not reduced, and the Rogowski coil current sensor has wide practical application capability.

Description

technical field [0001] The invention relates to the field of AC current measurement, in particular to a system and method for expanding the measurement bandwidth of a Rogowski coil current sensor. Background technique [0002] In recent years, the switching frequency of power electronic converters has increased to several megahertz or even tens of megahertz. Increasing the switching frequency of the system can effectively reduce the volume of passive components, which is helpful to realize the miniaturization of the system. Therefore, the development of current sensors with wide measurement bandwidth and small size is promoted. Rogowski coil current sensors are considered to be the best measurement tools for measuring AC currents and transient high currents. It overcomes many common shortcomings of ordinary current sensors that cannot test large or high-frequency currents due to magnetic saturation. And different types of Rogowski coils with hollow structure have the adva...

Claims

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Application Information

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IPC IPC(8): G01R19/00
CPCG01R19/0092
Inventor 何怡刚刘晓宇王枭
Owner WUHAN UNIV
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