CN-121679313-B - 10KV breaker opening and closing fault early warning method for ring main unit system

CN121679313BCN 121679313 BCN121679313 BCN 121679313BCN-121679313-B

Abstract

The invention relates to the technical field of fault early warning, in particular to a 10KV breaker opening and closing fault early warning method of a ring main unit system. According to the invention, through collecting voltage signals in the operation period of the circuit breaker and generating current waveform time sequence data, the whole process record of the operation process is realized, the characteristic structure reflecting the change of the operation state can be constructed by combining frequency domain conversion and main frequency distribution extraction, so that the frequency spectrum deviation abnormality is precisely positioned, a high-dimensional characteristic vector is formed by utilizing the frequency change and amplitude difference in the period, the expression capability of an abnormal mode is enhanced, on the basis, the dynamic identification and risk early warning of potential fault trend are realized by judging the dense distribution condition of abnormal frequency bands, the timeliness and accuracy of fault identification are obviously improved, and meanwhile, the dependence on manual inspection and a fixing device is reduced.

Inventors

WU CHAOHUI
HE YUANPING
LIN RONGSHENG
XIE SHAOCONG
GUO LIZHI
YANG CHAOQUAN

Assignees

泉州维盾电气有限公司

Dates

Publication Date: 20260512
Application Date: 20260210

Claims (9)

1. A10 KV breaker opening and closing fault early warning method of a ring main unit system is characterized by comprising the following steps: S1, collecting voltage signals of a brake opening coil, a brake closing coil and an energy storage motor in an operation period in a ring main unit 10KV breaker, and carrying out data structure construction by combining an operation starting time stamp and an operation type label to generate a current waveform time sequence data set; S2, based on a current waveform time sequence data set, performing frequency domain conversion to obtain a frequency and amplitude mapping group, defining a fixed frequency interval, determining a main frequency point, arranging the fixed frequency interval into a frequency position vector according to a section sequence, and constructing a main frequency distribution mapping structure table; S3, matching the frequency band main frequency point vector in the previous period according to the main frequency point recorded by the main frequency distribution mapping structure table, calculating the frequency offset difference value segment by segment to identify an abnormal frequency band, establishing a frequency band index, and outputting an abnormal frequency band index set; s4, reading the frequency band index position recorded by the abnormal frequency band index set, extracting the main frequency position difference value and the amplitude change rate of the corresponding frequency band in the current period and the previous period, constructing a multi-field matrix by combining the current period operation type codes, and executing standardized normalization processing by unifying the field sequence and the length to form a breaker operation feature vector structure; S5, according to the breaker operation characteristic vector structure, performing abnormal frequency band concentration judgment operation, confirming spectrum deviation aggregation phenomenon in the same operation period, sending out early warning information, and outputting opening and closing fault early warning records; The main frequency point specifically refers to a frequency position corresponding to the maximum amplitude point.
2. The method for early warning of a 10KV breaker opening and closing fault of a ring main unit system according to claim 1, wherein the abnormal frequency band specifically means a frequency band in which a frequency offset difference value is offset to exceed a set frequency spectrum variation discrimination threshold.
3. The method for early warning the switching-on and switching-off faults of the 10KV breaker of the ring main unit system according to claim 1, wherein the spectrum deviation aggregation phenomenon specifically refers to counting the number of abnormal frequency bands in the breaker operation characteristic vector structure, and if the number of continuous abnormal frequency bands is larger than a set aggregation length threshold, confirming that the spectrum deviation aggregation phenomenon exists.
4. The method for early warning the opening and closing faults of the 10KV breaker of the ring main unit system according to claim 1, wherein the current waveform time sequence data set comprises opening coil current characteristics, closing coil current characteristics, energy storage motor current characteristics, operation starting time labels and operation type labels, the main frequency distribution mapping structure table comprises frequency interval numbers, main frequency points of each interval and frequency position vectors, the abnormal frequency band index set comprises frequency offset abnormal section identifiers, frequency offset difference value records and super-threshold judgment marks, the breaker operation characteristic vector structure body comprises main frequency difference value vectors, amplitude change rate vectors and operation type codes, and the opening and closing fault early warning records comprise breaker codes, abnormal frequency band aggregation conditions and operation time stamps.
5. The method for early warning of a switching failure of a 10KV circuit breaker of a ring main unit system according to claim 1, wherein the step of acquiring the current waveform time sequence data set is: S111, collecting voltage signals of a brake opening coil, a brake closing coil and an energy storage motor in an operation period in a ring main unit 10KV breaker, uniformly aligning the collected voltage signals according to a sampling time axis, intercepting according to an operation starting time stamp, reserving a signal sequence in the range of the operation period, and generating a voltage signal set in the operation period; s112, based on the voltage signal set in the operation period, synchronously sampling the voltage value and the time dimension of each channel voltage signal by combining an analog-to-digital converter, extracting discretized voltage sample points, constructing a sample point sequence with uniform time intervals, and combining according to the channel sequence of the sensor to obtain a discretized multichannel voltage sequence; S113, extracting operation starting time stamp and operation type label according to the discretization multichannel voltage sequence, performing structure calibration and classification coding treatment on each sequence, performing identification injection according to operation type, completing unified time sequence organization, and establishing a current waveform time sequence data set.
6. The method for early warning of a switching failure of a 10KV circuit breaker of a ring main unit system according to claim 1, wherein the step of obtaining the main frequency distribution mapping structure table is: S211, performing fast Fourier transform on each channel voltage sequence based on the current waveform time sequence data set, performing complex domain transform operation under fixed sampling frequency, extracting real part and imaginary part values in a corresponding frequency domain, calculating amplitude values of each frequency point, and generating a frequency amplitude corresponding array; s212, based on the frequency amplitude corresponding array, dividing a frequency axis interval and dividing the frequency axis interval into equal-width sections averagely, searching a frequency value corresponding to the maximum amplitude in each section, marking the frequency value as a main frequency candidate point if the frequency value is larger than a set amplitude judgment standard, comparing the amplitude values of all candidate points, and positioning the frequency point with the maximum amplitude in each section to obtain an interval main frequency set; S213, according to the interval main frequency set, numbering and arranging each frequency point according to the frequency interval sequence, constructing a main frequency vector structure, binding the value of each frequency point with the interval index to generate ordered mapping pairs, uniformly packaging the ordered mapping pairs into a two-dimensional table structure, and constructing a main frequency distribution mapping structure table.
7. The method for early warning of a switching failure of a 10KV circuit breaker of a ring main unit system according to claim 1, wherein the step of acquiring the abnormal frequency band index set is: S311, extracting the main frequency value of each frequency band in the current operation period according to the main frequency points recorded by the main frequency distribution mapping structure table, reading the frequency position vector in the previous period, carrying out one-to-one index comparison on each corresponding frequency band, constructing a two-period main frequency comparison matrix under the same frequency band number, executing vector level difference value calculation operation, calculating the frequency offset value sequence of the current period relative to the previous period, and generating a frequency band main frequency offset vector; S312, based on the frequency band main frequency offset vector, if the frequency band frequency offset value is larger than a set frequency spectrum fluctuation judging threshold, marking the corresponding frequency band as a frequency spectrum fluctuation abnormal section, recording the corresponding section number, and marking abnormal and normal frequency band distribution states to obtain a frequency spectrum abnormal mark array; S313, according to the frequency spectrum abnormality identification array, index numbers with abnormal frequency band states are searched, all section numbers meeting the condition that the frequency spectrum deviation is larger than a set frequency spectrum fluctuation judging threshold value are aggregated into an aggregate structure, duplicate removal and ascending order processing is carried out on the aggregate structure, and an abnormal frequency band index set is output.
8. The method for early warning of a switching failure of a 10KV circuit breaker of a ring main unit system according to claim 1, wherein the step of obtaining the circuit breaker operation feature vector structure is: S411, reading all frequency band numbers recorded in the abnormal frequency band index set, constructing two field vector structures by indexing a main frequency position value and an amplitude value corresponding to the frequency band in the current period and the previous period item by item, calculating the difference between the main frequency position values and obtaining a frequency change value, and simultaneously performing proportional calculation operation on the amplitude field to obtain a change rate vector to generate a main frequency band change parameter set; s412, based on the main frequency band change parameter set, aggregating operation category codes of the current period, combining a main frequency position difference value, an amplitude change rate and an operation category number according to a field sequence to construct a three-field parameter matrix, performing interpolation operation on missing fields of each frequency band, and marking the missing sections to obtain a breaker operation parameter matrix; S413, according to the breaker operation parameter matrix, unifying the field length and the arrangement sequence, respectively carrying out standardization processing on the main frequency position difference value and the amplitude change rate, keeping the operation type field as discrete values unchanged, storing and outputting the operation type field in a structural body form after finishing the conversion of all the fields, and establishing a breaker operation characteristic vector structural body.
9. The method for early warning of opening and closing faults of a 10KV breaker of a ring main unit system according to claim 1, wherein the step of acquiring opening and closing fault early warning records is as follows: s511, extracting main frequency position difference value normalization value fields of all frequency bands in each operation period based on the breaker operation feature vector structure, sequencing according to frequency band numbers from small to large, executing abnormal state judgment on each frequency band in the sequencing result, counting the number of the continuous frequency band segments with abnormal marks, and generating a frequency spectrum abnormal continuous section count value; s512, according to the frequency spectrum abnormal continuous section count value, if the number of abnormal sections in any group of continuous frequency bands is larger than a set aggregation length threshold, confirming that a frequency spectrum deviation aggregation phenomenon exists in an operation period, and simultaneously extracting the number of a circuit breaker and the timestamp information of the current operation period to generate a frequency spectrum aggregation state record item; And S513, according to the spectrum aggregation state record item, summarizing the records marked as the aggregation state, aggregating the breaker number, the operation time stamp and the aggregation identification field to construct a record structure, adding an early warning label, and establishing an opening and closing fault early warning record.

Description

10KV breaker opening and closing fault early warning method for ring main unit system Technical Field The invention relates to the technical field of fault early warning, in particular to a 10KV breaker opening and closing fault early warning method of a ring main unit system. Background The technical field of fault early warning mainly relates to real-time monitoring, abnormality analysis and risk prejudging of the running state of power equipment, comprising equipment running parameter acquisition, abnormal state identification, fault trend modeling and early warning mechanism establishment, wherein the acquisition information is dynamically analyzed by constructing a multi-source data acquisition system and combining an algorithm model, so that the advanced identification and response strategy formulation of potential faults are realized. The traditional breaker opening and closing fault early warning method refers to a mode of pre-identifying and prompting abnormal states of a breaker in a power system in the process of executing opening or closing operation, and mainly aims at technical matters such as mechanical clamping stagnation, electromagnetic driving abnormality, control signal interruption or position feedback abnormality which possibly occur in the process of operating the breaker, and the traditional method generally carries out primary identification in a mode of manually and periodically inspecting, installing a limit switch to detect a stroke position, detecting action current by using a current transformer, monitoring operation duration by using a time relay and the like. The prior breaker opening and closing fault early warning mainly relies on manual regular inspection and traditional electrical detection device to judge the state of the breaker, has obvious limitation in terms of identification precision and reaction speed, relies on elements such as a limit switch, a current transformer and a time relay to indirectly monitor, is difficult to capture dynamic changes in the operation process in time, and particularly is difficult to realize effective early warning when hidden faults such as mechanical clamping stagnation or electromagnetic driving abnormality are not completely exposed, in addition, the prior art lacks multidimensional parameter association analysis on the running state of equipment, potential abnormality caused by frequency domain characteristic change cannot be identified, and the early warning signal is single, the missed detection risk is higher, the response strategy is lagged, and the integral safety of the operation of the breaker and the stability of an electric power system are influenced. Disclosure of Invention In order to solve the technical problems in the prior art, the embodiment of the invention provides a 10KV breaker opening and closing fault early warning method of a ring main unit system, which comprises the following steps: In order to achieve the purpose, the invention adopts the following technical scheme that the 10KV breaker opening and closing fault early warning method of the ring main unit system comprises the following steps: S1, collecting voltage signals of a brake opening coil, a brake closing coil and an energy storage motor in an operation period in a ring main unit 10KV breaker, and carrying out data structure construction by combining an operation starting time stamp and an operation type label to generate a current waveform time sequence data set; S2, based on a current waveform time sequence data set, performing frequency domain conversion to obtain a frequency and amplitude mapping group, defining a fixed frequency interval, determining a main frequency point, arranging the fixed frequency interval into a frequency position vector according to a section sequence, and constructing a main frequency distribution mapping structure table; S3, matching the frequency band main frequency point vector in the previous period according to the main frequency point recorded by the main frequency distribution mapping structure table, calculating the frequency offset difference value segment by segment to identify an abnormal frequency band, establishing a frequency band index, and outputting an abnormal frequency band index set; s4, reading the frequency band index position recorded by the abnormal frequency band index set, extracting the main frequency position difference value and the amplitude change rate of the corresponding frequency band in the current period and the previous period, constructing a multi-field matrix by combining the current period operation type codes, and executing standardized normalization processing by unifying the field sequence and the length to form a breaker operation feature vector structure; And S5, according to the breaker operation characteristic vector structure, performing abnormal frequency band concentration judgment operation, confirming the spectrum deviation aggregation phenomenon in the same operation