Active anti-DC component current transformer
A current transformer, DC current technology, applied in the direction of measuring current/voltage, measuring only current, measuring electrical variables, etc., can solve the problems of increasing measurement error of current transformer and increasing energy measurement error of electric energy meter.
Pending Publication Date: 2021-09-14
陈德才
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- Application Information
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Problems solved by technology
With the increase of power electronic equipment, especially the application of rectification equipment, frequency conversion equipment, and switching power supply equipment, the DC current component in the power grid increases, resulting in an increase in the measurement error of the current transformer, which in turn leads to an increase in the energy measurement error of the electric energy meter.
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Embodiment Construction
[0023] In order to illustrate the present invention more clearly, preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
[0024] Such as figure 2 As shown, this embodiment is an active anti-DC component current transformer, including: a DC current sensor 1, a magnetic core 2, a compensation coil winding 3, a primary coil winding 4, and a secondary coil winding 5;
[0025] The compensation coil winding 3, the primary coil winding 4 and the secondary coil winding 5 are all wound on the magnetic core 2;
[0026] The input positive terminal (Iin+) of the DC current sensor 1 is connected to the non-identical terminal of the primary coil winding 4, the output positive terminal (Iout+) of the DC current sensor 1 is connected to the non-identical terminal of the compensation coil winding 3, and the DC current sensor 1 The negative output terminal (Iout-) of the compensation coil winding 3 is connected with the terminal of...
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The invention discloses an active anti-DC component current transformer, which comprises a DC current sensor, a magnetic core, a compensation coil winding, a primary coil winding and a secondary coil winding, the compensation coil winding, the primary coil winding and the secondary coil winding are wound on the magnetic core; the input positive end of the DC sensor is connected with a non-dotted terminal of the primary coil winding, the output positive end of the DC sensor is connected with the non-dotted terminal of the compensation coil winding, and the output negative end of the direct current sensor is connected with the dotted terminal of the compensation coil winding; the dotted terminal of the primary coil winding and the input negative end of the direct current sensor are the input ends of the active anti-direct-current-component current transformer, and the two ends of the secondary coil winding are the output ends of the active anti-direct-current-component current transformer. Under the condition that the input current contains the direct current component, a measurement error is basically the same as the measurement error of the alternating current under the condition that the input current does not contain the direct current component.
Description
technical field [0001] The invention belongs to the technical field of current measurement, and in particular relates to an active anti-DC component current transformer. Background technique [0002] The current transformer is the main device of the electric energy meter, which is used to measure the line current, and calculate the electric energy used by the power user according to the measured line current and line voltage. With the increase of power electronic equipment, especially the application of rectification equipment, frequency conversion equipment, and switching power supply equipment, the DC current component in the power grid increases, resulting in an increase in the measurement error of the current transformer, which in turn leads to an increase in the energy measurement error of the electric energy meter. . [0003] Chinese patent application number 200510077418.2 discloses an anti-DC component current transformer magnetic core and its manufacturing method a...
Claims
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IPC IPC(8): G01R15/18G01R19/00
CPCG01R15/185G01R19/0092
Inventor 陈德才
Owner 陈德才