Waveform Synchronous Correction Method and System Applicable to Transient Waveform Recording Type Fault Indicator
A fault indicator and waveform synchronization technology, applied in the fault location and other directions, can solve the problems of asynchronous three-phase recording, large error, affecting the waveform analysis results of the master station, etc., and achieve high accuracy.
Active Publication Date: 2021-06-08
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +3
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Problems solved by technology
One of the difficulties of the transient waveform recording fault indicator is that the a, b, and c three-phase recordings are not synchronized, which leads to a large error in the synthesis of zero-sequence components, which affects the waveform analysis results of the master station
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[0035] The technical solutions of the various embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.
[0036] The waveform synchronous correction method suitable for the transient wave recording type fault indicator provided by the present invention uses the collection unit of the transient state wave recording type fault indicator to correct the wave recording waveform of the acquisition unit, such as figure 1 shown. The specific process is as follows:
[0037] Step 1, the fault indicator collection unit obtains the a, b, c three-phase current recording waveforms of the acquisiti...
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The invention discloses a waveform synchronous correction method and system suitable for a fault indicator of a transient waveform recording type. The method includes acquiring a three-phase current recording waveform of an acquisition unit; and sampling the last f / 50*2 of the a-phase current waveform point for modal analysis; read the trigger recording time of phase a current waveform, take f / 50 sampling points forward, corresponding to time t1, and the corresponding time of the next sampling point of t1 is t2, and so on, from tg to Then take f / 50 sampling points; conduct modal analysis to obtain error energies △E1, △E2...△Eg, and take the starting time point tfa of the time window corresponding to the minimum value; complete b and c phase analysis in turn to obtain three The minimum value is taken at the initial moment of the phase fault; the three-phase currents are respectively shifted to the left to obtain the three-phase synchronous waveform recording. The invention corrects the wave recording waveform of the fault indicator of the transient wave recording type, so as to ensure the high accuracy of the wave recording waveform used for analysis by the main station.
Description
technical field [0001] The invention relates to a waveform synchronous correction method and system suitable for a fault indicator of a transient waveform recording type, and belongs to the technical field of power system distribution automation. Background technique [0002] At present, the power grid is actively promoting the construction of distribution automation, focusing on improving the application level of distribution automation. Transient wave recording type fault indicator is installed on the distribution line, used to monitor the field strength and current of the line, and record the wave at the time of the fault. Transient waveform recording type fault indicators can transmit alarm signals and recording files to the main station for fault research and judgment, analysis and decision-making of the main station. [0003] The fault indicator of transient state recording type is composed of three acquisition units and one collection unit. The three acquisition unit...
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IPC IPC(8): G01R31/08
Inventor 吴楠史明明袁宇波孙健杨雄焦昊祁承磊周涛张刘冬方鑫曾飞李娟朱卫平何明袁晓冬陈兵
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST