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Current transformer and coil winding method thereof

A technology of current transformer and winding method, which is applied in the direction of transformer/inductor coil/winding/connection, inductor, transformer/inductance parts, etc., which can solve measurement error, influence of electric energy meter measurement accuracy, sampling signal and There are problems such as deviation in the theoretical value, and the effect of high precision is achieved

Active Publication Date: 2017-02-22
NINGBO SANXING MEDICAL & ELECTRIC CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

Then, when R1=R2, the sampling signal R1(I0+I1)+R2(I0-I2)≠(R1+R2)I0, the sampling signal measured by the electric energy meter deviates from the theoretical value, which causes measurement errors, especially When measuring a small current, the useful signal itself is very small, and the influence of the interference signal will be prominent at this time, which will have a great impact on the measurement accuracy of the electric energy meter

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  • Current transformer and coil winding method thereof
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  • Current transformer and coil winding method thereof

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Embodiment Construction

[0019] Such as figure 1 As shown, R1 and R2 are sampling resistors, usually R1=R2, and Vi is the sampling signal at the front end of the metering chip. There will be distributed capacitance between the primary coil and the secondary coil of the current transformer, and these distributed capacitances are equivalent to two parasitic capacitances C1 and C2. When there is a voltage difference between the primary coil and the secondary coil of the current transformer, an interference source U will be formed. Since the equivalent parasitic capacitance can communicate, the interference source U will form a closed path through C1, C2, R1, and R2. I0 represents the sampling current converted by the current transformer, I1 and I2 represent the interference current flowing through R1 and R2 and the direction of I1 and I2 is opposite, the theoretical value of the sampling signal Vi=(R1+R2)I0, the actual value Vi'=R1 (I0+I1)+R2(I0-I2), when C1=C2, then I1=I2, then the sampling signal Vi'=...

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Abstract

The invention provides a current transformer and a coil winding method thereof. The current transformer comprises a magnetic core, wherein a secondary coil winds the outside of the magnetic core and comprises a first secondary coil and a second secondary coil; at least one layer of first secondary coil winds the outside of the magnetic core; at least one layer of second secondary coil reversely winds the outside of the first secondary coil; a head end of the first secondary coil is connected with the head end of the second secondary coil; and a tail end of the first secondary coil and the tail end of the second secondary coil are two output ends of the secondary coil. After adopting the design, stray capacitance generated between the primary coil and the secondary coil of the current transformer is relatively balanced; the anti-jamming capability of the current transformer is high; and the measurement accuracy of an electric energy meter is improved.

Description

technical field [0001] The invention relates to a current transformer, in particular to a current transformer which can be used for a high-precision electric energy meter and a coil winding method thereof. Background technique [0002] The energy meter is an instrument used to measure the power consumption of electrical equipment. It is an indispensable application instrument in life and industry. Therefore, the measurement accuracy of the energy meter should be as high as possible to reduce the overpayment or underpayment of electricity bills caused by measurement errors. Various economic problems caused by paying electricity bills. At present, the three-phase electric energy meter usually uses a current transformer for current conversion, and the winding method of the secondary coil of the current transformer is to use a wire to wind sequentially from the inside to the outside, from the beginning of the wire to the end, the wire layer 1, 2, ..., n in sequence, the first e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F38/30H01F27/30
CPCH01F27/306H01F38/30
Inventor 明晋平周伟光金海波
Owner NINGBO SANXING MEDICAL & ELECTRIC CO LTD