Calibration method of three-phase voltage transformer based on voltage transformer load error curve extrapolation

A voltage transformer and error curve technology, applied in the field of three-phase voltage transformer verification, to achieve the effects of good linearity, flexible device verification methods, and small temperature coefficient

Active Publication Date: 2012-12-26
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +1
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Problems solved by technology

[0005] The purpose of the present invention is to address the many shortcomings of the existing three-phase voltage transformer verification method, and propose a three-phase voltage transformer verification method based on the voltage transformer load error curve extrapolation method to solve the problem of using a three-phase high-voltage power supply verification method. The traditional method of voltage transformer, and realize the requirements of simple equipment and convenient operation

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  • Calibration method of three-phase voltage transformer based on voltage transformer load error curve extrapolation
  • Calibration method of three-phase voltage transformer based on voltage transformer load error curve extrapolation
  • Calibration method of three-phase voltage transformer based on voltage transformer load error curve extrapolation

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Embodiment Construction

[0025] The present invention passes to TYD110 / The -0.02W3 capacitive three-phase voltage transformer is tested by the voltage transformer load error curve extrapolation method. The parameters of the tested transformers are shown in Table 1.

[0026] Table 1 Three-phase voltage transformer parameters

[0027]

[0028] According to the three-phase voltage transformer verification method based on the voltage transformer load error curve extrapolation method of the present invention:

[0029] (1) Each secondary winding is set to no-load, and the no-load error (f 0 ,δ 0 );

[0030] (2) According to the primary and secondary rated load S set by the verification device x , choose the load with cosφ=1, when choose S H =10VA, and switch to the main secondary circuit;

[0031] (3) In other secondary no-load and main secondary load S with power factor 1 H (cosφ H = 1, SH ), the measured principal quadratic error is (f H ,δ H );

[0032] (4) According to other secondary r...

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Abstract

The invention relates to a calibration method of a three-phase voltage transformer based on a voltage transformer load error curve extrapolation, comprising the following steps of: controlling the wiring way of a device resistor according to the rated loads of a primary secondary winding and other secondary windings of a tested object set by a calibration device and outputting a proper load; measuring the no-load error (f0, Delta 0) of the primary secondary winding of the voltage transformer under the condition that each secondary winding is no-load; measuring the error (fH, Delta H) of the primary secondary winding under the condition that other secondary windings is are no-load and the primary secondary winding carries a load SH(cos Phi H=1, SH) with the power factor being 1; measuring the error (Fp, Delta P) of the primary secondary winding under the condition that the primary secondary is no-load and a secondary winding for relay protection carries a load SP(cos Phi P=1, SP) with the power factor being 1; and calculating the error (fU, Delta U) of the primary secondary winding under the condition that the rated load of the primary secondary winding is Sx, Cos Phi x=0.8 and the rated load of the other secondary windings is Spx, cos Phi px=0.8) based on a voltage transformer load error curve prediction equation. The invention is suitable for calibrating various three-phase voltage transformers on site and in labs.

Description

technical field [0001] The invention relates to a three-phase voltage transformer verification method based on a voltage transformer load error curve extrapolation method, which belongs to the technical field of electric energy measurement. Background technique [0002] The JJG1021-2007 "Power Transformer" verification regulations implemented on May 28, 2007 stipulates: "To verify the three-phase five-column voltage transformer, a three-phase high-voltage power supply should be applied, and a standard voltage mutual inductor should be connected between the measured phase and the ground. The secondary winding of the measured phase is connected to the voltage load box, and the error is measured by the comparison method." [0003] In principle, three-phase three-column type, anti-ferromagnetic resonance type, and grounded voltage transformer through arc suppressing coil should be applied with three-phase high-voltage power supply for error measurement, and the field verificatio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/02
Inventor 靳绍平李东江赵江宁
Owner STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST
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