Rogowski coil current transformer measurement device and method based on auxiliary coil correction
A technology of current transformers and auxiliary coils, applied in the direction of measuring devices, measuring electrical variables, voltage/current isolation, etc., can solve problems such as poor resistance to electromagnetic interference, eliminate insufficient DC drift, etc., to ensure reliability and eliminate resistance to electromagnetic interference , Simplify the effect of relay protection logic
Active Publication Date: 2019-06-11
GUIZHOU POWER GRID CO LTD
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is: to provide a Rogowski coil current transformer measuring device and measurement method based on auxiliary coil correction, to solve the problem of anti-electromagnetic interference difference and eliminate Insufficient DC drift and other issues
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[0037] A Rogowski coil current transformer measuring device based on auxiliary coil correction, which includes a Rogowski coil, the output end of the Rogowski coil is connected to the first signal conditioning loop, the output end of the auxiliary coil is connected to the second signal conditioning loop, the first signal conditioning loop and The second signal conditioning circuit is respectively connected to different sampling channels of the A / D module, and the output terminal of the A / D module is connected to the controller; one path of the reference working power is connected to the reference voltage terminal of the A / D module, and the other path passes through the voltage divider circuit Connect to the sampling channel of the A / D module.
[0038] The auxiliary coil is an electromagnetic current transformer or a low power coil LPCT current transformer.
[0039] The controller is an FPGA controller.
[0040] The current measurement sensing element of the present invention in...
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The invention discloses a Rogowski Coil current transformer measurement device and method based on auxiliary coil correction, and the device comprises a Rogowski Coil. The device is characterized in that the output end of the Rogowski Coil is connected with a first signal conditioning loop; the output end of an auxiliary coil is connected with a second signal conditioning loop; the first and second signal conditioning loops are respectively connected with different sampling channels of an A / D module; the output end of the A / D module is connected with the controller; one way of a reference working power supply is connected to a reference voltage end of the A / D module, and the other way of the reference working power supply passes through a voltage-dividing loop to be connected to the sampling channel of the A / D module. The device solves problems that the Rogowski Coil electronic transformer current measurement in the prior art is poor in anti-electromagnetic interference performance, and is not sufficient in removal of DC drift.
Description
technical field [0001] The invention belongs to the primary current measurement technology of a power system, in particular to a Rogowski coil current transformer measurement device and method based on auxiliary coil correction. Background technique [0002] The current transformer based on Rogowski coil (Rogowski coil) has good linearity, simple insulation structure, no safety hazard, no iron core, no magnetic saturation phenomenon, high measurement bandwidth and high accuracy, so it has been widely used in smart substations. . However, since the output electromotive force of the Rogowski coil is proportional to the differential of the measured current to time, it is necessary to add a corresponding integral link to restore the signal proportional to the primary current. [0003] At present, the commonly used points restoration methods include hardware points and software points. In the hardware integration, since the RC discrete device is not an ideal device, factors suc...
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IPC IPC(8): G01R19/25G01R15/18
CPCG01R15/181G01R19/2506
Inventor 高吉普徐长宝鲁彩江周东顶汤汉松孟令雯
Owner GUIZHOU POWER GRID CO LTD