Method for eliminating measurement error of transformer by active impedance vector electric voltage synthesis

A technology of active impedance and measurement error, applied in the direction of inductors, measuring electrical variables, transformers, etc., can solve the problems of poor performance of glass film alloy iron core, complex circuit, difficult selection of circuit parameters, etc.

Inactive Publication Date: 2011-05-11
广州市格宁电气有限公司
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Problems solved by technology

[0008] 2. The circuit is complex. Because there is a deep AC negative feedback loop between the magneto-electric, it is easy to generate high-frequency self-excitation and phase shift, and the parameters of the circuit are not easy to choose
[0009] 3. The DC current drift is difficult to eliminate because there is no negative feedback loop, and the performance of the glass film alloy core will be deteriorated due to the influence of DC
[0010] 4. Due to the influence of mutual inductance and self-inductance, there is a reflection impedance problem in the electronic negative feedback of the compensation winding, which may cause false balance-zero flux in the detection winding, but the ampere-turn of the primary and secondary windings is not balanced

Method used

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  • Method for eliminating measurement error of transformer by active impedance vector electric voltage synthesis
  • Method for eliminating measurement error of transformer by active impedance vector electric voltage synthesis
  • Method for eliminating measurement error of transformer by active impedance vector electric voltage synthesis

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Embodiment Construction

[0030] Such as figure 2 , image 3 As shown, a method to eliminate the measurement error of the transformer through the vector voltage synthesis of the active impedance, the main circuit current of the secondary winding of the transformer and the current of the detection winding are independently detected and converted into voltages, and then the amplified two The circuit voltage is input to the adding operational amplifier for summing, and the vector voltage synthesis output of the active impedance is completed.

[0031] The main circuit current is converted into a voltage signal through the conversion resistors connected in parallel at both ends of the secondary winding W2, input to the non-inverting terminal of the first general-purpose operational amplifier IC1 to amplify the output, and then connected to the inverting terminal of the adding operational amplifier IC4 for input; the detection winding W3 The two ends are connected in parallel to the in-phase and inverting ...

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Abstract

The invention discloses a method for eliminating transformer measurement errors by active impedance vector voltage resultant. The method is to detect a current of a primary circuit of a secondary winding and a current of a detection winding of a transformer independently and respectively, convert the currents into voltages, amplify the converted voltages, input the converted voltages to an add operation amplifier to sum the converted voltages and complete output of active impedance vector voltage resultant. The method can eliminate transformer measurement errors and improve measurement precision.

Description

technical field [0001] The method relates to a method for eliminating the measurement error of a double-stage current transformer in alternating current measurement. Background technique [0002] Current transformers are indispensable electrical components in power systems and metering and testing systems. This is because: a, it has low input impedance, b, it has good long-term stability and temperature characteristics, c, it can convert large current into small current measurement through impedance transformation. [0003] With the development of production and market needs, the requirements for accurate measurement of current transformers are getting higher and higher. There is an urgent need for instrument current transformers that measure currents ranging from hundreds of amperes to several milliamperes, with a measurement accuracy of 10PPm. Due to the characteristics of the transformer itself, in actual work, it will vary with the input current, secondary load and oth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/02H01F38/28
Inventor 赵祥林贺艳平骆雪叶小雪
Owner 广州市格宁电气有限公司
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