Transformer direct-current magnetic bias current calculation method and system based on fault recording data
A technology of fault recording and DC bias, applied in the field of computing systems
Inactive Publication Date: 2014-11-05
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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[0007] In view of the above deficiencies, one of the purposes of the present invention is to provide a transformer DC bias current calculation method based on fault recording data, which aims to solve the problem of automatic processing of DC bias data analysis that cannot be realized by existing fault recording data The problem
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[0056] Please refer to Figure 6As shown, a transformer DC bias current calculation method based on fault record data, which includes the following steps:
[0057] 1. Obtain the original fault recording data. Please refer to figure 1 shown. figure 1 It is the fault recording signal automatically triggered by the converter transformer when the DC bias magnetic saturation alarm occurs, which are YY (the primary side and the secondary side are both connected in star form) and YD (the primary side is connected in star form, and the secondary side is connected in delta form). connection) type converter transformer neutral point recording wave. The fault recording data signal can come from the Hall cell sensor, or from the AC current transformer or voltage transformer. The fault recording data signal used for DC bias technology analysis comes from the Hall cell sensor. The transformation ratio between the raw data of the fault recording obtained by the Hall cell sensor and the ...
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The invention discloses a transformer direct-current magnetic bias current calculation method based on fault recording data. The method is characterized by comprising the steps of acquiring a fault recording data signal at the moment of transformer direct-current magnetic bias saturation alarm and forming a recording waveform file, converting the recording waveform file into an ASCII code data file, selecting ASCII code data of transformer neutral point current according to the ASCII code data file, calculating direct current, fundamental current and harmonic current components, acquiring spectrograms of the direct current, the fundamental current and the harmonic current components, and calculating the effective value of current. The invention further discloses a transformer direct-current magnetic bias current calculation system. According to the invention, the direct-current magnetic bias current, the fundamental current, the harmonic currents and the effective-value current can be automatically processed and calculated according to transformer fault recording, and whether the direct-current magnetic bias of a transformer exceeds the withstand direct current capability of equipment can be judged so as to put forward the next control measure and ensure safe and stable operation of main transformer equipment.
Description
technical field [0001] The invention belongs to the field of power transmission and transformation of electric power systems, and relates to a high-voltage direct current transmission project under the operation mode of a single pole earth loop, which causes neutral point direct current, fundamental wave current, and harmonic Calculation method and system for wave current and RMS current. Background technique [0002] As more and more HVDC projects are put into operation, the site selection, construction and operation of grounding electrodes are becoming more and more important. Under the operation mode of single-pole ground return line of HVDC power transmission project, the injection current of the ground electrode will cause the ground around the pole site to present a certain degree of potential gradient, and radiate outward in the radial direction of concentric circles with the pole site as the center. For two transformers whose neutral points are directly grounded wit...
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IPC IPC(8): G01R31/00G01R23/16G06F19/00
Inventor 刘青松伍衡彭光强周海滨梁晨张良
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID