Voltage transformer excitation characteristic curve calculating method
A technology of voltage transformer and excitation characteristics, which is applied in the direction of instruments, measuring electric variables, measuring devices, etc., and can solve problems such as difficult analysis and calculation
Active Publication Date: 2016-04-06
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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Problems solved by technology
Theoretical calculations such as voltage transformer resonance overvoltage calculations and fault analysis require the use of a complete excitation characteristic curve. When a large error occurs in the saturation section of the excitation characteristic curve, analysis and calculation are difficult. Therefore, the current effective value method is used to obtain the excitation characteristics of the voltage transformer. Flawed
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[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0028] Taking a certain 10kV voltage transformer as an example, the method for obtaining the voltage transformer is used to obtain the excitation characteristics of the voltage transformer below, and the specific steps are as follows:
[0029] ①Set a series of test voltages. The test voltage includes 0.2, 0.5, 0.8, 1.0, 1.2 times the rated voltage.
[0030] ② Obtain the voltage and current waveform data at both ends of the voltage transformer under each voltage. Taking the 1.2 times rated voltage test as an example, the obtained voltage and current waveforms are as follows figure 2 shown.
[0031] ③ Use MATLAB software to analyze the harmonics of the current waveform, and obtain the peak values of each harmonic as shown in Table 1:
[0032] Table 11. Results of current harmonics under 2 times rated voltage excitation
[0033] H...
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The invention discloses a voltage transformer excitation characteristic curve calculating method. At present, most of test units adopt a method of acquiring the excitation characteristic based on the average voltage value and current effective value, and the method has some limitations. According to the method of the invention, the average voltage value and the current waveform harmonic characteristic of a voltage transformer are analyzed, the flux value across the two ends of the voltage transformer is worked out based on the average voltage waveform data, the current peak in the power frequency period is acquired through current harmonic analysis, and then, the excitation characteristic including the saturated section of the voltage transformer is acquired. The method takes into consideration the influence of voltage and current waveform distortion after voltage transformer saturation on excitation characteristic data calculation, and the excitation characteristic of the voltage transformer including the saturated section can be acquired more accurately.
Description
technical field [0001] The invention relates to a method for obtaining an excitation characteristic curve of a voltage transformer, in particular to a method for obtaining an excitation characteristic curve of a voltage transformer based on the definition of the excitation characteristic. Background technique [0002] The measurement of excitation characteristics is of great significance for iron core equipment such as electromagnetic voltage transformers. Through the longitudinal comparison of the excitation characteristic curve and the historical data, it can be checked whether there is an inter-turn short circuit in the voltage transformer and other equipment. Therefore, the relevant test standards list the excitation characteristic measurement as the type test and routine test item of the voltage transformer. On the other hand, when performing ferromagnetic resonance analysis, inrush current calculation, etc. analysis on the above-mentioned non-linear iron core inductanc...
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IPC IPC(8): G01R35/02
CPCG01R35/02
Inventor 李特周国良胡文堂金涌涛金宇波冯宇哲
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY