CN117665654A - Method and system for detecting windings of oil immersed transformer based on optical fiber sensor - Google Patents
Method and system for detecting windings of oil immersed transformer based on optical fiber sensor Download PDFInfo
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- CN117665654A CN117665654A CN202311417931.7A CN202311417931A CN117665654A CN 117665654 A CN117665654 A CN 117665654A CN 202311417931 A CN202311417931 A CN 202311417931A CN 117665654 A CN117665654 A CN 117665654A
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- 238000004804 winding Methods 0.000 title claims abstract description 79
- 239000013307 optical fiber Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims description 19
- 230000008859 change Effects 0.000 claims abstract description 169
- 239000000835 fiber Substances 0.000 claims abstract description 23
- 238000001514 detection method Methods 0.000 claims abstract description 21
- 238000012545 processing Methods 0.000 claims description 35
- 230000002411 adverse Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 230000008569 process Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
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Abstract
The invention discloses an oil immersed transformer winding detection method and system based on an optical fiber sensor, wherein the detection method comprises the following steps: s100, arranging a fiber bragg grating sensor around a transformer winding; s200, detecting real-time temperature around a transformer winding by each fiber bragg grating sensor; s300, calculating and counting the real-time temperature, and recording the abrupt change degree and the frequency of the temperature rise; s400, alarming when the abrupt change degree of the temperature rise reaches a preset threshold value or/and the abrupt change times of the temperature rise reach a preset threshold value; when the temperature rise in the preset unit time exceeds a preset first temperature change threshold, the rapid change of the temperature rise is judged, and when the temperature rise in the preset unit time exceeds a preset second temperature change threshold, the rapid change degree of the temperature rise is judged to reach the preset threshold; when the temperature detection of the transformer winding is carried out, the fiber bragg grating sensor is not directly buried in the transformer winding, and the structure of the transformer winding is not adversely affected.
Description
Technical Field
The invention belongs to the technical field of transformer winding detection, and particularly relates to an oil immersed transformer winding detection method and system based on an optical fiber sensor.
Background
The service life and failure rate of the transformer are closely related to the temperature of the transformer winding, and the transformer can be accelerated to deteriorate in oil quality when operated at high temperature for a long time, so that insulation is reduced to damage the transformer, and therefore, the temperature of the transformer in the operation process must be monitored. In actual operation, the temperature of each point in the transformer is greatly different due to uneven heat distribution in the insulation system of the transformer, wherein the temperature rise of hot spots of the transformer winding is most remarkable, so the temperature monitoring of the transformer is mainly performed on the transformer winding.
The prior patent of China with the application number of CN201210231471.4 discloses a winding temperature measuring device of an oil immersed transformer and a temperature measuring method thereof, wherein the winding temperature measuring device comprises a gasket, the upper surface of the gasket is provided with a groove, high-temperature insulating glue is arranged in the groove, an insulating paper tube is arranged in the high-temperature insulating glue, a probe type fiber grating temperature sensor is arranged in the insulating paper tube and is connected with a signal outgoing line, a sealing cover plate is arranged on the upper surface of the gasket, which is provided with the groove, and the gasket and the sealing cover plate which are combined together are movably arranged in a gap of the winding of the oil immersed transformer. The winding temperature measuring device of the oil immersed transformer has the advantages of simple structure, easiness in operation, safety, reliability and accurate temperature measurement value.
However, the probe fiber bragg grating temperature sensor of the temperature measuring device of the oil immersed transformer winding is directly embedded into the transformer winding, which can have adverse effects on the structure of the transformer.
Disclosure of Invention
The invention aims to provide an oil immersed transformer winding detection method and system based on an optical fiber sensor, and aims to solve the problem that a probe type optical fiber grating temperature sensor is directly buried in a transformer winding to adversely affect the structure of a transformer in the existing oil immersed transformer winding temperature measurement device and method.
In order to achieve the above object, according to a first aspect of the present invention, there is provided an oil immersed transformer winding detection method based on an optical fiber sensor, comprising the steps of:
s100, arranging a fiber bragg grating sensor around a transformer winding;
s200, detecting real-time temperature around a transformer winding by each fiber bragg grating sensor;
s300, calculating and counting the real-time temperature, and recording the abrupt change degree and the frequency of the temperature rise;
and S400, alarming when the abrupt change degree of the temperature rise reaches a preset threshold value or/and the abrupt change times of the temperature rise reach a preset threshold value.
Further, when the temperature rise in the preset unit time exceeds the preset first temperature change threshold, the rapid change of the temperature rise is judged, and when the temperature rise in the preset unit time exceeds the preset second temperature change threshold, the rapid change degree of the temperature rise is judged to reach the preset threshold, and the second temperature change threshold is larger than the first temperature change threshold.
Further, when the temperature rise in the preset unit time exceeds the preset first temperature change threshold and is smaller than the second temperature change threshold, recording the number of times of abrupt temperature rise change once; recording the number of times of abrupt change of the temperature rise when the temperature rise in the preset unit time exceeds the preset second temperature change threshold; and alarming when the accumulated rapid change times of the temperature rise reach a preset temperature change times threshold value.
Further, a statistical table is drawn according to the recorded rapid temperature rise change times and the preset temperature change times threshold, when the rapid temperature rise change times reach 25%, 50%, 75%, 90% and 100% of the preset temperature change times threshold, the statistics are respectively carried out once, and warning marks are carried out on the statistics.
Further, when each fiber bragg grating sensor detects real-time temperature around the transformer winding, a real-time temperature curve S around the transformer winding is obtained, a first temperature change threshold curve S1 and a second temperature change threshold curve S2 are drawn according to the trend of the real-time temperature curve S and the first temperature change threshold and the second temperature change threshold, the length of the first temperature change threshold curve S1 and the second temperature change threshold curve S2 on a time coordinate is larger than the length of the real-time temperature curve S on the time coordinate, and a plurality of parts are drawn in advance according to the trend of the real-time temperature curve S.
Further, when the first real-time temperature curve S penetrates between the first temperature change threshold curve S1 and the second temperature change threshold curve S2, recording the number of times of abrupt temperature rise change once; when the first real-time temperature curve S penetrates into the upper part of the second temperature change threshold curve S2, the number of times of abrupt temperature rise changes is recorded.
Further, when the first real-time temperature curve S penetrates between the first temperature change threshold curve S1 and the second temperature change threshold curve S2, a first warning mark is performed at the first real-time temperature curve S, and a time-temperature curve chart in a time range before and after the position is automatically stored; when the first real-time temperature curve S penetrates into the upper part of the second temperature change threshold curve S2, a second warning mark is carried out at the first real-time temperature curve S, and a time-temperature curve chart in a period of time before and after the position is automatically stored; the first warning sign and the second warning sign should be distinguished.
Further, a unit statistical time and a frequency threshold corresponding to the unit statistical time are preset, and when the frequency of the abrupt change degree of temperature rise reaches the frequency threshold in the unit statistical time, an alarm is given.
According to a second aspect of the present invention, there is provided an oil immersed transformer winding detection system based on an optical fiber sensor, which performs oil immersed transformer winding detection by using the above oil immersed transformer winding detection method based on an optical fiber sensor, and the system comprises an optical fiber grating sensor module, a data processing module, an alarm module and a display module, wherein the optical fiber grating sensor module, the alarm module and the display module are all electrically connected with the data processing module, the optical fiber grating sensor module is arranged around the transformer winding, and is used for detecting real-time temperature around the transformer winding, and transmitting detection signals to the data processing module, the data processing module calculates and counts the received real-time temperature, records the degree and the number of rapid temperature rise changes, and when the degree of rapid temperature rise reaches a preset threshold or/and the number of rapid temperature rise changes reaches the preset threshold, the data processing module transmits signals to the alarm module, and the alarm module receives the signals and gives an alarm.
Further, the data processing module draws a real-time temperature curve S according to the received real-time temperature signal by taking time as an abscissa and taking temperature as an ordinate, and draws a first temperature change threshold curve S1 and a second temperature change threshold curve S2 according to the trend of the real-time temperature curve S and the first temperature change threshold and the second temperature change threshold, wherein the real-time temperature curve S, the first temperature change threshold curve S1, the second temperature change threshold curve S2, the abscissa and the ordinate jointly form a time-temperature curve, and the time-temperature curve is displayed through the display module; the lengths of the first temperature change threshold curve S1 and the second temperature change threshold curve S2 on the time coordinates are larger than those of the real-time temperature curve S on the time coordinates, and the excess parts are drawn in advance according to the trend of the real-time temperature curve S; the data processing module is further electrically connected with a storage module and a query module, the storage module stores data according to the storage instruction of the data processing module, and the query module is used for querying the data stored in the storage module.
Compared with the prior art, the invention has the following beneficial effects:
1. when the temperature of the transformer winding is detected, the fiber bragg grating sensor for detecting the temperature is not directly buried in the transformer winding, and the structure of the transformer winding is not adversely affected.
2. The invention can calculate and count the temperature signal detected by the fiber grating sensor, can obtain the temperature change condition of the transformer winding and the impact condition of short-circuit current, can further judge the running condition of the transformer winding, can reasonably and orderly repair and maintain the transformer according to the judging result, is beneficial to ensuring the normal running of the transformer, and is also beneficial to avoiding unexpected power failure caused by the fact that the transformer is not timely repaired and maintained.
3. According to the invention, a real-time temperature curve S can be drawn by taking time as an abscissa and temperature as an ordinate according to the received real-time temperature signal, a first temperature change threshold curve S1 and a second temperature change threshold curve S2 can be drawn according to the trend of the real-time temperature curve S and the first temperature change threshold and the second temperature change threshold, the real-time temperature curve S, the first temperature change threshold curve S1, the second temperature change threshold curve S2 and the abscissa and the ordinate jointly form a time-temperature curve, and the time-temperature curve is displayed on a computer display screen of a machine room, so that relevant staff can observe the running condition of a transformer winding conveniently.
4. The invention presets the unit statistical time and the frequency threshold corresponding to the unit statistical time, and alarms when the frequency of the abrupt change degree of the temperature rise reaches the frequency threshold in the unit statistical time, thereby being convenient for the staff to find the high-frequency short-circuit impact fault in time and being convenient for the staff to process the fault in time.
Drawings
FIG. 1 is a flow chart of a method for detecting windings of an oil immersed transformer based on an optical fiber sensor according to the present invention;
FIG. 2 is a statistical table drawn according to the recorded number of abrupt changes in temperature rise and a threshold value of the preset number of temperature changes in the embodiment of the present invention;
FIG. 3 is a graph of time versus temperature for an embodiment of the present invention without a sharp change in temperature rise;
FIG. 4 is a graph showing time versus temperature when the first real-time temperature curve S crosses between the first temperature change threshold curve S1 and the second temperature change threshold curve S2, with a sharp change in temperature rise in an embodiment of the present invention;
FIG. 5 is a graph showing time versus temperature when the first real-time temperature curve S crosses over the second temperature change threshold curve S2 with a sharp change in temperature in an embodiment of the present invention;
fig. 6 is a block diagram of a detection system for an oil immersed transformer winding based on an optical fiber sensor according to the present invention.
The specific embodiment is as follows:
in the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The following is further described with reference to the accompanying drawings and specific examples:
example 1
The embodiment provides a method for detecting an oil immersed transformer winding based on an optical fiber sensor, a flow chart of the method is shown in fig. 1, and the method comprises the following steps:
and S100, distributing fiber grating sensors around the transformer winding, wherein four fiber grating sensors are uniformly distributed on the outer side of each iron core.
And S200, each fiber bragg grating sensor detects real-time temperature around the transformer winding and transmits the real-time temperature to the data processing module.
And S300, calculating and counting the real-time temperature by the data processing module, and recording the abrupt change degree and the frequency of the temperature rise. The data processing module is preset with a first temperature change threshold value and a second temperature change threshold value, the second temperature change threshold value is larger than the first temperature change threshold value, and the magnitudes of the first temperature change threshold value and the second temperature change threshold value are determined according to a transformer winding short-circuit current impact experiment.
And S400, when the abrupt change degree of the temperature rise reaches a preset threshold value, the data processing module controls the alarm module to alarm. And when the temperature rise in the preset unit time exceeds the preset second temperature change threshold value, judging that the abrupt change degree of the temperature rise reaches the preset threshold value. When the temperature rise in the preset unit time exceeds the preset first temperature change threshold, the temperature rise is judged to be changed rapidly, and when the frequency of the rapid temperature rise change reaches the preset threshold, the data processing module also controls the alarm module to alarm. That is, the temperature rise abrupt change degree reaches the preset threshold value and the temperature rise abrupt change times reach the preset threshold value, and the alarm can be immediately given as long as any one of the two values is satisfied.
And counting the number of the abrupt temperature rise changes in the following manner, and recording the number of the abrupt temperature rise changes once when the temperature rise in the preset unit time exceeds the preset first temperature change threshold and is smaller than the second temperature change threshold. And when the temperature rise in the preset unit time exceeds the preset second temperature change threshold, recording the number of times of abrupt temperature rise changes, wherein the number of times can be 2 times, 3 times, 4 times or more. The method is specifically set to record for how many times, and is determined according to experimental results and the set value of the second temperature change threshold. Accumulating according to the times recording result, and alarming when the accumulated temperature rise rapid change times reach a preset temperature change times threshold value.
And drawing a statistical table according to the recorded rapid change times of the temperature rise and the threshold value of the preset temperature change times, as shown in figure 2. The preset temperature change number threshold is set to 30 times, and 28 times have been counted at present. When the rapid temperature rise change times reach 25%, 50%, 75% and 90% of the preset temperature change times threshold, respectively performing independent statistics, counting corresponding time, and performing warning marking on the independent statistics in a statistical display and color deepening mode.
As shown in fig. 3, 4 and 5, after the fiber grating sensor transmits the detected real-time temperature around the transformer winding to the data processing module, the data processing module draws a real-time temperature curve S according to the received real-time temperature signal by taking time as an abscissa and taking temperature as an ordinate. And the data processing module draws a first temperature change threshold curve S1 and a second temperature change threshold curve S2 according to the trend of the real-time temperature curve S and the first temperature change threshold and the second temperature change threshold, the real-time temperature curve S, the first temperature change threshold curve S1, the second temperature change threshold curve S2 and the abscissa and the ordinate form a time-temperature curve together, and the time-temperature curve is displayed on a computer display screen of a machine room so as to be convenient for relevant staff to observe. The time-temperature curve is plotted such that the lengths of the first temperature change threshold curve S1 and the second temperature change threshold curve S2 on the time coordinates are longer than the lengths of the real-time temperature curve S on the time coordinates, and the excess portions are plotted in advance according to the trend of the real-time temperature curve S. For example, the change condition of the curve curvature in a period of time at the tail end of the real-time temperature curve S is intercepted, and the data processing module performs simulation calculation by taking the tail end of the real-time temperature curve S as a base point according to the change condition to obtain partial curves with more first temperature change threshold curves S1 and second temperature change threshold curves S2.
The time-temperature graph is shown in fig. 3 when the transformer is operating normally and no short circuit current is impinging on the transformer windings. The time-temperature graphs are shown in fig. 3 and 4 when there is an impact of the short-circuit current on the transformer winding. When the number of rapid changes in temperature rise is recorded by the time-temperature graph, the calculation can be performed as follows. When the first real-time temperature curve S penetrates between the first temperature change threshold curve S1 and the second temperature change threshold curve S2, the number of times of abrupt temperature rise change is recorded. When the first real-time temperature curve S penetrates into the upper part of the second temperature change threshold curve S2, the number of times of abrupt temperature rise changes is recorded.
Since the first temperature change threshold curve S1 and the second temperature change threshold curve S2 are obtained on the basis of the real-time temperature curve S, when the first real-time temperature curve S changes abruptly, the first temperature change threshold curve S1 and the second temperature change threshold curve S2 change along with the real-time temperature curve S after being delayed for a set period of time, so that in order to preserve the case of each abrupt temperature change, when the first real-time temperature curve S penetrates between the first temperature change threshold curve S1 and the second temperature change threshold curve S2, a first warning mark is made there, and a time-temperature curve in a period of time before and after the position is automatically preserved. When the first real-time temperature curve S penetrates above the second temperature change threshold curve S2, a second warning mark is carried out at the first real-time temperature curve S, and a time-temperature curve chart in a time range before and after the position is automatically stored. The first warning mark and the second warning mark are different, for example, the first warning mark and the second warning mark are both solid circle marks on the time axis, but the sizes or colors of the first warning mark and the second warning mark are different.
In addition, a unit statistical time and a frequency threshold corresponding to the unit statistical time are preset in the data processing module, and when the frequency of the abrupt change degree of temperature rise reaches the frequency threshold in the unit statistical time, an alarm is given. For example, the unit statistical time is 1 day, the frequency threshold value is 3 times, and the frequency of the abrupt change degree of temperature rise reaches 3 times in 1 day, so that the alarm is given out, the operation fault is emphasized by the staff, and the operation fault is processed in time.
Example 2
The embodiment provides an oil immersed transformer winding detection system based on an optical fiber sensor, and the oil immersed transformer winding detection method based on the optical fiber sensor provided in the embodiment 1 is utilized to detect the oil immersed transformer winding. The structure of the oil immersed transformer winding detection system is shown in fig. 6, and the oil immersed transformer winding detection system comprises a fiber grating sensor module, a data processing module, an alarm module, a display module, a storage module and a query module, wherein the fiber grating sensor module, the alarm module, the display module, the storage module and the query module are all electrically connected with the data processing module. The data processing module can be a CPU of a computer, compiled running software or running programs and the like, and the alarm module can be an audible alarm, an audible and visual alarm, a GSM remote alarm and the like. The display module may be a display electrically connected to the data processing module. The fiber bragg grating sensor module comprises a plurality of fiber bragg grating sensors which are distributed around the transformer winding and used for detecting real-time temperature around the transformer winding and transmitting detection signals to the data processing module, the data processing module calculates and counts the received real-time temperature and records the rapid change degree and the frequency of the temperature rise, when the rapid change degree of the temperature rise reaches a preset threshold value or/and the rapid change frequency of the temperature rise reaches the preset threshold value, the data processing module transmits signals to the alarm module, and the alarm module alarms after receiving the signals. The storage module stores data according to the storage instruction of the data processing module, for example, when the first real-time temperature curve S penetrates between the first temperature change threshold curve S1 and the second temperature change threshold curve S2, for example, when the first real-time temperature curve S penetrates above the second temperature change threshold curve S2, the data processing module stores the time-temperature curve in the corresponding time range in the storage module. The query module may be used to query various data stored by the storage module.
As shown in fig. 3, fig. 4 and fig. 5, the data processing module draws a real-time temperature curve S according to the received real-time temperature signal by taking time as an abscissa and taking temperature as an ordinate, and draws a first temperature change threshold curve S1 and a second temperature change threshold curve S2 according to the trend of the real-time temperature curve S and the first temperature change threshold and the second temperature change threshold, wherein the real-time temperature curve S, the first temperature change threshold curve S1, the second temperature change threshold curve S2, the abscissa and the ordinate form a time-temperature curve together, and the time-temperature curve is displayed by the display module; the lengths of the first temperature change threshold curve S1 and the second temperature change threshold curve S2 on the time coordinate are larger than the length of the real-time temperature curve S on the time coordinate, and the excess parts are drawn in advance according to the trend of the real-time temperature curve S.
The working principle of the invention is as follows: when short-circuit current impacts the transformer winding, the temperature of the transformer winding changes sharply, and insulating oil around the transformer winding also changes sharply in a period of time, so that the insulating oil is detected by the fiber bragg grating sensor around the transformer winding. The temperature signal detected by the fiber bragg grating sensor is calculated and counted, the temperature change condition of the transformer winding and the impact condition of short-circuit current can be obtained, the running condition of the transformer winding can be further judged, the transformer can be reasonably and orderly maintained according to the judging result, normal running of the transformer is guaranteed, and unexpected power failure caused by the fact that the transformer is not maintained in time is avoided.
In summary, when the temperature of the transformer winding is detected, the fiber bragg grating sensor for detecting the temperature is not directly buried in the transformer winding, and the structure of the transformer winding is not adversely affected.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An oil immersed transformer winding detection method based on an optical fiber sensor is characterized in that: the method comprises the following steps:
s100, arranging a fiber bragg grating sensor around a transformer winding;
s200, detecting real-time temperature around a transformer winding by each fiber bragg grating sensor;
s300, calculating and counting the real-time temperature, and recording the abrupt change degree and the frequency of the temperature rise;
and S400, alarming when the abrupt change degree of the temperature rise reaches a preset threshold value or/and the abrupt change times of the temperature rise reach a preset threshold value.
2. The method for detecting the winding of the oil immersed transformer based on the optical fiber sensor according to claim 1, wherein when the temperature rise in the preset unit time exceeds a preset first temperature change threshold value, the temperature rise is judged to be changed rapidly, and when the temperature rise in the preset unit time exceeds a preset second temperature change threshold value, the temperature rise is judged to be changed rapidly to reach the preset threshold value, and the second temperature change threshold value is larger than the first temperature change threshold value.
3. The method for detecting the winding of the oil immersed transformer based on the optical fiber sensor according to claim 2, wherein when the temperature rise in a preset unit time exceeds a preset first temperature change threshold value and is smaller than a second temperature change threshold value, the number of times of abrupt temperature rise changes is recorded once; recording the number of times of abrupt change of the temperature rise when the temperature rise in the preset unit time exceeds the preset second temperature change threshold; and alarming when the accumulated rapid change times of the temperature rise reach a preset temperature change times threshold value.
4. A method for detecting windings of an oil immersed transformer based on an optical fiber sensor according to claim 3, wherein a statistical table is drawn according to the recorded number of abrupt temperature rise changes and a preset number of temperature change thresholds, and when the number of abrupt temperature rise changes reaches 25%, 50%, 75%, 90% and 100% of the preset number of temperature change thresholds, each individual statistic is counted and a warning mark is given to the individual statistic.
5. The method for detecting the winding of the oil immersed transformer based on the optical fiber sensor according to claim 2, wherein when each optical fiber grating sensor detects the real-time temperature around the winding of the transformer, a real-time temperature curve S around the winding of the transformer is obtained, a first temperature change threshold curve S1 and a second temperature change threshold curve S2 are drawn according to the trend of the real-time temperature curve S and a first temperature change threshold value and a second temperature change threshold value, the lengths of the first temperature change threshold value curve S1 and the second temperature change threshold value curve S2 on time coordinates are larger than the lengths of the real-time temperature curve S on time coordinates, and a plurality of parts are drawn in advance according to the trend of the real-time temperature curve S.
6. The method for detecting the winding of the oil immersed transformer based on the optical fiber sensor according to claim 5, wherein when the first real-time temperature curve S penetrates between the first temperature change threshold curve S1 and the second temperature change threshold curve S2, the number of times of abrupt temperature rise changes is recorded once; when the first real-time temperature curve S penetrates into the upper part of the second temperature change threshold curve S2, the number of times of abrupt temperature rise changes is recorded.
7. The method for detecting windings of an oil immersed transformer based on an optical fiber sensor according to claim 4, wherein when a first real-time temperature curve S penetrates between a first temperature change threshold curve S1 and a second temperature change threshold curve S2, a first warning mark is performed at the first real-time temperature curve S, and a time-temperature curve graph of a period of time before and after the position is automatically stored; when the first real-time temperature curve S penetrates into the upper part of the second temperature change threshold curve S2, a second warning mark is carried out at the first real-time temperature curve S, and a time-temperature curve chart in a period of time before and after the position is automatically stored; the first warning sign and the second warning sign should be distinguished.
8. The method for detecting the winding of the oil immersed transformer based on the optical fiber sensor according to claim 1, wherein a unit statistical time and a frequency threshold corresponding to the unit statistical time are preset, and when the frequency of the abrupt change degree of the temperature rise reaches the frequency threshold in the unit statistical time, an alarm is given.
9. The optical fiber sensor-based oil immersed transformer winding detection system is characterized by comprising an optical fiber grating sensor module, a data processing module, an alarm module and a display module, wherein the optical fiber grating sensor module, the alarm module and the display module are electrically connected with the data processing module, the optical fiber grating sensor module is distributed around the transformer winding and used for detecting real-time temperature around the transformer winding and transmitting detection signals to the data processing module, the data processing module calculates and counts the received real-time temperature, records the temperature rise abrupt change degree and times, and transmits signals to the alarm module when the temperature rise abrupt change degree reaches a preset threshold value or/and the temperature rise abrupt change times reach the preset threshold value, and the alarm module alarms after receiving the signals.
10. The optical fiber sensor-based oil immersed transformer winding detection system according to claim 9, wherein the data processing module draws a real-time temperature curve S according to the received real-time temperature signal by taking time as an abscissa and taking temperature as an ordinate, draws a first temperature change threshold curve S1 and a second temperature change threshold curve S2 according to the trend of the real-time temperature curve S and the first temperature change threshold and the second temperature change threshold, and the real-time temperature curve S, the first temperature change threshold curve S1, the second temperature change threshold curve S2, and the abscissa and the ordinate form a time-temperature curve together and display the time-temperature curve through the display module; the lengths of the first temperature change threshold curve S1 and the second temperature change threshold curve S2 on the time coordinates are larger than those of the real-time temperature curve S on the time coordinates, and the excess parts are drawn in advance according to the trend of the real-time temperature curve S; the data processing module is further electrically connected with a storage module and a query module, the storage module stores data according to the storage instruction of the data processing module, and the query module is used for querying the data stored in the storage module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311417931.7A CN117665654A (en) | 2023-10-30 | 2023-10-30 | Method and system for detecting windings of oil immersed transformer based on optical fiber sensor |
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| CN202311417931.7A CN117665654A (en) | 2023-10-30 | 2023-10-30 | Method and system for detecting windings of oil immersed transformer based on optical fiber sensor |
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