Temperature detection method and system for transformer winding outlet cable

Abstract

The invention relates to the technical field of cable temperature detection, in particular to a temperature detection method and system for a transformer winding outlet cable, and the method comprises the steps: obtaining an optical signal of a monitoring point on the transformer winding outlet cable; acquiring a current signal of a transformer winding outlet cable; obtaining the initial correction optical signal intensity at each moment in the periodic signal segment of the optical signal; obtaining a final deviation value of each moment in each periodic signal segment; obtaining a final influence index that the optical signal intensity of the monitoring point at the current moment is influenced by the work of the transformer; obtaining the final corrected optical signal intensity of the monitoring point at the current moment; and obtaining the real temperature value of the monitoring point at the current moment according to the final corrected optical signal intensity. According to the invention, the accuracy of measuring the temperature of the transformer winding outlet cable through the fluorescent optical fiber temperature sensor when the transformer vibrates is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cable temperature detection, and in particular to a method and system for detecting the temperature of a transformer winding outgoing cable. Background Art

[0002] Transformer winding outgoing cables refer to the wires that connect the transformer windings to the external circuit. The transformer generates a lot of heat during operation, especially the winding outgoing cables. If the temperature is too high, the insulation material will age easily, leading to insulation breakdown or failure, causing safety accidents. Therefore, it is very important to detect the temperature of the transformer winding outgoing cables.

[0003] When the prior art detects the temperature of the transformer winding outgoing cable, the sensor needs to monitor the light signal reflected or transmitted by the optical fiber in real time, and then the temperature value can be obtained after the corresponding algorithm processing. Because the transformer will generate an alternating magnetic field when the transformer is in operation, the iron core of the transformer will cause a magnetostrictive effect to occur in the iron core. The magnetostrictive effect refers to the phenomenon that when the magnetization state of a magnetic material changes under the action of an external magnetic field, its size or volume will change slightly. The magnetostrictive effect of the iron core will cause a certain vibration of the transformer core. This vibration change will cause the fluorescent fiber temperature sensor to be subjected to additional stress, causing the luminescence characteristics of the fluorescent material in the fluorescent fiber to change, resulting in inaccurate temperature measurement when the fluorescent fiber temperature sensor is used to measure the temperature of the transformer winding outgoing cable. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a method and system for detecting the temperature of transformer winding outgoing cables.

[0005] A method and system for detecting the temperature of a transformer winding outgoing cable of the present invention adopts the following technical solutions: An embodiment of the present invention provides a method for detecting the temperature of a transformer winding outgoing cable, the method comprising the following steps: Obtain an optical signal of a monitoring point on the transformer winding outgoing cable, wherein the optical signal includes the optical signal strength at several moments; obtain a current signal of the transformer winding outgoing cable, wherein the current signal includes the current value at several moments; In each optical signal, a number of periodic signal segments are obtained; based on the optical signal strength and current value at the corresponding moment in each periodic signal segment and the previous periodic signal segment, the initial corrected optical signal strength at each moment in each periodic signal segment is obtained; based on the difference between the optical signal strength at each moment in each periodic signal segment and the initial corrected optical signal strength, combined with the current value at the corresponding moment, the final deviation value at each moment in each periodic signal segment reflecting the optical signal strength under the influence of the transformer operation is obtained; According to the final deviation value and the optical signal strength, the initial impact index of each monitoring point at each moment in each periodic signal segment of the optical signal to which it belongs is obtained, which reflects the optical signal strength affected by the operation of the transformer; according to the difference in the initial impact index between the monitoring point and the adjacent monitoring point at each moment in each periodic signal segment of the optical signal to which they belong, and the initial impact index, the final impact index of the optical signal strength of each monitoring point at the current moment affected by the operation of the transformer is obtained; According to the final influencing index, the optical signal strength of the monitoring point at the current moment is corrected to obtain the final corrected optical signal strength of each monitoring point at the current moment; according to the final corrected optical signal strength of the monitoring point at the current moment, the real temperature value of each monitoring point at the current moment is obtained.

[0006] Furthermore, the specific method of obtaining a plurality of periodic signal segments in each optical signal is as follows: Record any monitoring point as the monitoring point to be analyzed, and record the optical signal of the monitoring point to be analyzed as the optical signal to be analyzed; record the differential signal of the optical signal to be analyzed as the optical differential signal to be analyzed; perform discrete Fourier transform on the optical differential signal to be analyzed to obtain the spectrum of the optical differential signal to be analyzed, take the frequency with the largest amplitude in the spectrum as the reference frequency of the optical differential signal to be analyzed, and take the reciprocal of the reference frequency as the reference period of the optical differential signal to be analyzed; starting from the first signal amplitude in the optical differential signal to be analyzed, obtain a signal segment with the same length as the reference period, which is recorded as the first signal segment; obtain the extreme value closest to the last signal amplitude in the first signal segment in the optical differential signal to be analyzed, which is recorded as the first extreme value, and record the amplitude from the first signal amplitude to the first extreme value in the optical differential signal to be analyzed. as the first reference period signal segment of the optical differential signal to be analyzed; starting from the first extreme value in the optical differential signal to be analyzed, obtain a signal segment with the same length as the reference period, recorded as the second signal segment; obtain the extreme value closest to the last signal amplitude in the second signal segment in the optical differential signal to be analyzed, recorded as the second extreme value, and use the signal segment from the first extreme value to the second extreme value in the optical differential signal to be analyzed as the second reference period signal segment of the optical differential signal to be analyzed; and so on, obtain multiple reference period signal segments of the optical differential signal to be analyzed; obtain the division moments of all reference period signal segments in the optical differential signal to be analyzed, all recorded as key division moments; divide the optical signal to be analyzed according to all key division moments, and obtain a number of period signal segments of the optical signal to be analyzed.

[0007] Further, the initial corrected optical signal strength at each moment in each periodic signal segment is obtained according to the optical signal strength and current value at the corresponding moment in each periodic signal segment and the previous periodic signal segment, and the specific steps include the following: Any moment in the optical signal to be analyzed is recorded as the moment to be analyzed; the periodic signal segment to which the optical signal intensity at the moment to be analyzed belongs is recorded as the periodic signal segment to be analyzed; the order value of the moment to be analyzed in the periodic signal segment to be analyzed is recorded as ; ; In the formula, is the number of the periodic signal segments to be analyzed and the previous periodic signal segments in the optical signal to be analyzed; is the first optical signal to be analyzed In the periodic signal segment The current value corresponding to the current signal at a certain moment; is the first optical signal to be analyzed The average value of the current value corresponding to all moments in the current signal within a periodic signal segment; is the first optical signal to be analyzed In the periodic signal segment The optical signal strength at a certain moment; To take the absolute value; is the first The initial corrected optical signal strength at a certain moment.

[0008] Further, the method of obtaining the final deviation value at each moment in each cycle signal segment reflecting the influence of the operation of the transformer on the optical signal strength according to the difference between the optical signal strength at each moment in each cycle signal segment and the initial corrected optical signal strength, combined with the current value at the corresponding moment, includes the following specific steps:

[0009] In the formula, is the first The optical signal strength at a certain moment; is the first The initial deviation value of the optical signal strength at a certain moment affected by the operation of the transformer; According to the initial deviation value and the current value at the corresponding moment, the final deviation value at each moment in each cycle signal segment reflecting the optical signal strength affected by the operation of the transformer is obtained.

[0010] Further, the method of obtaining the final deviation value at each moment in each periodic signal segment reflecting the optical signal strength affected by the operation of the transformer according to the initial deviation value and the current value at the corresponding moment includes the following specific steps:

[0011] In the formula, is the first The current value corresponding to the current signal at a certain moment; is the first The order value corresponding to the moment in the optical signal to be analyzed; is the first optical signal to be analyzed In the periodic signal segment The order value corresponding to the moment in the optical signal to be analyzed; is the first optical signal to be analyzed In the periodic signal segment The initial deviation value of the optical signal strength at a certain moment affected by the operation of the transformer; is an exponential function with a natural constant as base; is the first The final deviation value of the optical signal strength at a certain moment affected by the operation of the transformer.

[0012] Further, the method of obtaining, based on the final deviation value and the optical signal strength, an initial impact index reflecting the optical signal strength under the influence of the transformer operation at each monitoring point at each moment in each periodic signal segment of the corresponding optical signal comprises the following specific steps:

[0013] In the formula, The monitoring point to be analyzed is the first one in the periodic signal segment to be analyzed of the optical signal to be analyzed. The initial impact indicator of the optical signal strength at a certain moment affected by the operation of the transformer.

[0014] Furthermore, the method of obtaining the final impact index of the optical signal strength of each monitoring point at the current moment affected by the transformer operation according to the difference in the initial impact index at each moment in each periodic signal segment of the optical signal to which the monitoring point belongs and the initial impact index between the monitoring point and the adjacent monitoring point includes the following specific steps:

[0015] In the formula, is the number of the periodic signal segments to be analyzed and the previous periodic signal segments in the optical signal to be analyzed; The monitoring point to be analyzed is the first In the periodic signal segment The initial impact index of the optical signal strength at a moment on the transformer operation; The monitoring point to be analyzed The adjacent monitoring point is in the first In the periodic signal segment The initial impact index of the optical signal strength at a moment on the transformer operation; The monitoring point to be analyzed is the first one in the periodic signal segment to be analyzed of the optical signal to be analyzed. The degree to which the optical signal strength at the moment is affected by the 𝑘th adjacent monitoring point; According to the difference in initial influence index between the monitoring point and all adjacent monitoring points at each moment in each periodic signal segment of the optical signal to which they belong, the credible factor of the influence of each monitoring point on each adjacent monitoring point at each moment in each periodic signal segment of the optical signal to which they belong is obtained; According to the initial impact index, impact degree and credibility factor, the final impact index of the optical signal strength of each monitoring point at the current moment affected by the transformer operation is obtained.

[0016] Further, the method of obtaining the trust factor of each monitoring point affected by each adjacent monitoring point at each moment in each periodic signal segment of the optical signal to which it belongs according to the difference in initial influence index between the monitoring point and all adjacent monitoring points at each moment in each periodic signal segment of the optical signal to which they belong comprises the following specific steps:

[0017] In the formula, is the number of adjacent monitoring points of the monitoring point to be analyzed; To take the absolute value; is the hyperbolic tangent function; The monitoring point to be analyzed is the first one in the periodic signal segment to be analyzed of the optical signal to be analyzed. The moment The credibility factor of the influence of adjacent monitoring points.

[0018] Furthermore, the method of obtaining the final impact index of the optical signal strength of each monitoring point at the current moment affected by the transformer operation according to the initial impact index, impact degree and credibility factor includes the following specific steps: The optical signal strength at the current moment is the optical signal strength at the last moment of the optical signal at the monitoring point;

[0019] In the formula, is the number of adjacent monitoring points of the monitoring point to be analyzed; The monitoring point to be analyzed An initial impact index of the transformer operation on the optical signal strength of the adjacent monitoring points at the last moment in the last period signal segment of the optical signal; is the degree to which the optical signal intensity of the monitoring point to be analyzed at the last moment in the last period signal segment of the optical signal to be analyzed is affected by the 𝑘th adjacent monitoring point; The monitoring point to be analyzed is the last time the first signal is received in the last period of the optical signal to be analyzed. Credibility factors of the influence of adjacent monitoring points; It is the final impact index of the optical signal intensity of the monitoring point to be analyzed at the last moment in the last cycle signal segment of the optical signal to be analyzed affected by the operation of the transformer.

[0020] The present invention also proposes a temperature detection system for transformer winding outgoing cables, comprising a memory and a processor, wherein the processor executes a computer program stored in the memory to implement the steps of the aforementioned method.

[0021] The beneficial effect of the technical solution of the present invention is that according to the present invention, when the magnetostrictive effect occurs in the iron core of the transformer and causes the transformer to vibrate, the influence of such vibration on the temperature measurement of the fluorescent optical fiber temperature sensor can be accurately analyzed, and the optical signal of the monitoring point on the transformer winding outlet cable is initially corrected, and the deviation of the optical signal intensity at each moment in each periodic signal segment of the optical signal affected by the transformer operation and the initial influence index affected by the transformer operation are analyzed, and then the final influence index of the optical signal intensity of the monitoring point on the cable at the current moment affected by the transformer operation is determined, and the optical signal intensity of the monitoring point at the current moment is corrected according to the final influence index to obtain the final corrected optical signal intensity of each monitoring point at the current moment, and the real temperature value of each monitoring point at the current moment is obtained through the final corrected optical signal intensity, thereby improving the accuracy of measuring the temperature of the transformer winding outlet cable by the fluorescent optical fiber temperature sensor when the transformer vibrates. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A flowchart of the steps of a method for detecting the temperature of an outgoing cable of a transformer winding provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of a temperature detection method and system for a transformer winding outlet cable proposed by the present invention, its specific implementation method, structure, features and effects, in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0025] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0026] The following is a detailed description of a method and system for detecting the temperature of a transformer winding outgoing cable provided by the present invention in conjunction with the accompanying drawings.

[0027] See also Figure 1 , which shows a flowchart of a method for detecting the temperature of a transformer winding outgoing cable provided by an embodiment of the present invention, the method comprising the following steps: Step S001, obtaining an optical signal of a monitoring point on a transformer winding outgoing cable, wherein the optical signal includes optical signal strengths at several moments; obtaining a current signal of the transformer winding outgoing cable, wherein the current signal includes current values ​​at several moments.

[0028] It should be noted that the working principle of the fluorescent fiber temperature sensor is as follows: (1) Excitation light source: The fluorescent fiber temperature sensor sends a certain wavelength of light into the optical fiber through an excitation light source (usually an LED or a laser). (2) Fluorescence emission: The fluorescent fiber material (such as an optical fiber doped with a fluorescent substance) emits fluorescence under the action of the excitation light, and the lifetime of the emitted fluorescence changes with the change of temperature. (3) Temperature-related fluorescence change: As the temperature changes, the molecular structure of the fluorescent material in the optical fiber changes, resulting in a change in the attenuation rate or wavelength of the fluorescence (such as a red shift or a blue shift), which can be used to infer the temperature. (4) Signal acquisition and analysis: The optical signal reflected or transmitted by the optical fiber is monitored in real time through a spectrum analyzer or optical readout device connected to the optical fiber sensor, and the temperature value is obtained after being processed by a corresponding algorithm. The main purpose of this embodiment is to reduce the interference of the fluorescent fiber temperature sensor on the optical signal measured when the transformer is working, and then obtain a more accurate temperature of the transformer winding outgoing cable based on the optical signal with reduced interference. Before starting the analysis, relevant data is first collected.

[0029] Specifically, the optical signal of the monitoring point on the transformer winding outgoing cable is obtained as follows: On the transformer winding outgoing cable, at preset intervals Set up a monitoring point. , is the length of the transformer winding outgoing cable in meters. A fluorescent fiber optic temperature sensor is installed at each monitoring point. The optical signal of each monitoring point is obtained through the fluorescent fiber optic temperature sensor. The acquisition frequency of the fluorescent fiber optic temperature sensor is 1 Hz, and the acquisition time is the last 2 hours.

[0030] Furthermore, the current signal of the transformer winding outgoing cable is obtained, as follows: The current signal of the transformer winding outgoing cable is obtained through the current sensor, where the collection frequency and collection time corresponding to the current signal and the optical signal are the same, that is, the collection frequency of the current sensor is 1 Hz, and the collection time is the last 2 hours.

[0031] It should be noted that both the optical signal and the current signal are discrete time signals.

[0032] At this point, the optical signal of the monitoring point on the transformer winding outgoing cable is obtained; and the current signal of the transformer winding outgoing cable is obtained.

[0033] Step S002, in each optical signal, obtain several periodic signal segments; obtain the initial corrected optical signal intensity at each moment in each periodic signal segment according to the optical signal intensity and current value at the corresponding moment in each periodic signal segment and the previous periodic signal segment; obtain the final deviation value at each moment in each periodic signal segment reflecting the influence of the transformer operation on the optical signal intensity according to the difference between the optical signal intensity at each moment in each periodic signal segment and the initial corrected optical signal intensity, combined with the current value at the corresponding moment.

[0034] It should be noted that in the transformer, since the iron core of the transformer is affected by the electromagnetic field generated when the transformer is running, the iron core will have a magnetostrictive effect. The magnetostrictive effect refers to the phenomenon that when the magnetization state of the magnetic material changes under the action of the external magnetic field, its size or volume will change slightly. Since the alternating electric field generated by the transformer is periodic, the expansion and contraction vibration of the iron core also presents the same periodic characteristics. This periodic vibration causes the fluorescence in the fluorescent fiber optic temperature sensor to be subjected to additional stress, and the stress is also periodic. The interference of the transformer during temperature measurement also changes periodically. In addition, considering that multiple positions are measured on the transformer winding outgoing cable, that is, different positions have corresponding optical signals, because the different positions of the outgoing cable are affected by the transformer to different degrees, the actual temperature of the adjacent places is close, but the temperature of the two monitoring points will be different. By combining the optical signals at all monitoring points, the periodic interference of the transformer operation on the fluorescent fiber optic temperature sensor at different positions is analyzed.

[0035] It should be noted that since the transformer is connected to a sinusoidal AC power supply when it is working, the vibration caused by the magnetostrictive effect on the transformer core also has a certain periodic change, and the fluorescent fiber optic temperature sensor connected to the winding output cable will also be subject to the same periodic interference. Under such interference, the interference of the fluorescent fiber optic temperature sensor when monitoring temperature also changes periodically, that is, in the monitoring data, the monitored optical signal will show corresponding periodicity. Therefore, it is necessary to analyze the periodic changes of the monitoring point affected by the interference of the transformer operation.

[0036] It should be further explained that in order to avoid period calculation errors caused by cable temperature changes, it is necessary to determine the interference caused by the transformer by analyzing the optical signal changes at the monitoring point, that is, it is necessary to analyze the periodic signal segment of the optical signal.

[0037] Specifically, in each optical signal, several periodic signal segments are obtained, as follows: Any monitoring point is recorded as a monitoring point to be analyzed, and the optical signal of the monitoring point to be analyzed is recorded as an optical signal to be analyzed; the differential signal of the optical signal to be analyzed is recorded as an optical differential signal to be analyzed. It should be noted that the differential signal of the optical signal to be analyzed is obtained by performing a differential operation on the optical signal to be analyzed. The differential operation specifically adopts a backward difference. It is an existing method to obtain a differential signal of a discrete time signal, which will not be described in detail in this embodiment; a discrete Fourier transform (Discrete Fourier Transform) is performed on the optical differential signal to be analyzed. Transform, DFT), obtain the spectrum of the optical differential signal to be analyzed, take the frequency with the largest amplitude in the spectrum as the reference frequency of the optical differential signal to be analyzed, and take the reciprocal of the reference frequency as the reference period of the optical differential signal to be analyzed; starting from the first signal amplitude in the optical differential signal to be analyzed, obtain a signal segment with the same length as the reference period, recorded as the first signal segment; obtain the extreme value closest to the last signal amplitude in the first signal segment in the optical differential signal to be analyzed, recorded as the first extreme value, and take the signal segment from the first signal amplitude to the first extreme value in the optical differential signal to be analyzed as the first reference period signal segment of the optical differential signal to be analyzed; Starting from the first extreme value in the optical differential signal to be analyzed, a signal segment with the same length as the reference period is obtained, which is recorded as the second signal segment; in the optical differential signal to be analyzed, the extreme value closest to the last signal amplitude in the second signal segment is obtained, which is recorded as the second extreme value, and the signal segment from the first extreme value to the second extreme value in the optical differential signal to be analyzed is used as the second reference period signal segment of the optical differential signal to be analyzed; and so on, multiple reference period signal segments of the optical differential signal to be analyzed are obtained; the division moments of all reference period signal segments in the optical differential signal to be analyzed are obtained, and are all recorded as key division moments; the optical signal to be analyzed is divided according to all key division moments to obtain a number of period signal segments of the optical signal to be analyzed.

[0038] It should be noted that, since the cycles corresponding to different interference stages when the transformer is working will have certain differences, the extreme value near the cycle is selected as the end of a cycle on the optical differential signal to be analyzed, and the position is used as a new starting point to adjust the next cycle using the same method to adapt to the changes in the cycle corresponding to the interference stage.

[0039] It should be noted that since the influence of the transformer on the fluorescent fiber optic temperature sensor is mainly caused by the alternating electric field generated by the current in the transformer winding, and the change of the electric field is affected by the change of the current, the period of interference caused by the transformer to the optical signal monitoring is relatively fast, and in a short period of time, the temperature change of the outgoing cable will not be too large; that is to say, in the last few cycles, the actual temperature change of a monitoring point is small, or even stable, so the difference between its monitoring value and the actual temperature is the interference situation at the corresponding moment, and the deviation value of the optical signal intensity monitored by the fluorescent fiber optic temperature sensor by the transformer at the time to be analyzed is calculated based on this, and the initial corrected optical signal intensity at the time to be analyzed in the optical signal is first analyzed.

[0040] Specifically, the initial corrected optical signal strength at each moment in each periodic signal segment is obtained according to the optical signal strength and current value at the corresponding moment in each periodic signal segment and the previous periodic signal segment, as follows: Any moment in the optical signal to be analyzed is recorded as the moment to be analyzed; the periodic signal segment to which the optical signal intensity at the moment to be analyzed belongs is recorded as the periodic signal segment to be analyzed; the order value of the moment to be analyzed in the periodic signal segment to be analyzed is recorded as , that is, the time to be analyzed is the first in the periodic signal segment to be analyzed a moment.

[0041]

[0042] In the formula, is the number of the periodic signal segments to be analyzed and the previous periodic signal segments in the optical signal to be analyzed; is the first optical signal to be analyzed In the periodic signal segment The current value corresponding to the current signal at a certain moment; is the first optical signal to be analyzed The average value of the current value corresponding to all moments in the current signal within a periodic signal segment; is the first optical signal to be analyzed In the periodic signal segment The optical signal strength at a certain moment; To take the absolute value; is the first The initial corrected optical signal strength at a certain moment.

[0043] It should be noted that the influence of the transformer on the fluorescent fiber temperature sensor is mainly due to the alternating electric field generated by the current in the transformer winding, and the change of the electric field is affected by the change of the current. Therefore, the current value at the corresponding moment in the periodic signal segment to be analyzed and the previous periodic signal segment is analyzed to perform a weighted average of the optical signal intensity to reduce the influence of the transformer operation on the fluorescent fiber temperature sensor. The smaller the current value corresponding to the current signal at the moment, the smaller the current value corresponding to the current signal at the moment. When the alternating electric field is weaker, the fluorescent fiber temperature sensor is less affected by the transformer operation, and the weighted light signal intensity is less affected. The optical signal strength is weighted averaged to obtain the initial corrected optical signal strength at each moment in each periodic signal segment of each optical signal.

[0044] Specifically, according to the difference between the optical signal strength at each moment in each periodic signal segment and the initial corrected optical signal strength, combined with the current value at the corresponding moment, the final deviation value at each moment in each periodic signal segment reflecting the optical signal strength affected by the transformer operation is obtained, including the following steps: Firstly, according to the difference between the optical signal intensity at each moment in each periodic signal segment of the optical signal and the initial corrected optical signal intensity, an initial deviation value of the optical signal intensity at each moment in each periodic signal segment of each optical signal affected by the operation of the transformer is obtained.

[0045] Secondly, according to the initial deviation value and the current value at the corresponding moment, the final deviation value at each moment in each cycle signal segment reflecting the optical signal strength affected by the transformer operation is obtained.

[0046] Specifically, according to the difference between the optical signal intensity at each moment in each periodic signal segment of the optical signal and the initial corrected optical signal intensity, an initial deviation value of the optical signal intensity at each moment in each periodic signal segment of each optical signal affected by the transformer operation is obtained, which is specifically as follows:

[0047] In the formula, is the first The optical signal strength at a certain moment; is the first The initial corrected optical signal strength at a moment; is the first The initial deviation value of the optical signal strength at a certain moment affected by the operation of the transformer.

[0048] It should be noted that the above analysis analyzes the deviation of the optical signal strength at a moment in a single cycle affected by the operation of the transformer, but its universality cannot be guaranteed. It may be a deviation caused by special circumstances. In order to better analyze the deviation of the optical signal strength affected by the operation of the transformer, multiple historical cycles are considered. The closer to the analysis moment or the current of the cable at the analysis moment, the more similar the actual temperature is, so the deviation fluctuations at the same moment in multiple cycles are weighted averaged. Based on this, the initial impact index of the optical signal strength of each monitoring point at each moment in each cycle signal segment of the optical signal to which it belongs is calculated. First, the final deviation value of the optical signal strength at each moment in each cycle signal segment of each optical signal affected by the operation of the transformer is analyzed.

[0049] Specifically, according to the initial deviation value and the current value at the corresponding moment, the final deviation value at each moment in each cycle signal segment reflecting the optical signal strength affected by the transformer operation is obtained, as follows:

[0050] In the formula, is the number of the periodic signal segments to be analyzed and the previous periodic signal segments in the optical signal to be analyzed; is the first The current value corresponding to the current signal at a certain moment; is the first optical signal to be analyzed In the periodic signal segment The current value corresponding to the current signal at a certain moment; is the first The order value corresponding to the moment in the optical signal to be analyzed; is the first optical signal to be analyzed In the periodic signal segment The order value corresponding to the moment in the optical signal to be analyzed; is the first optical signal to be analyzed In the periodic signal segment The initial deviation value of the optical signal strength at a certain moment affected by the operation of the transformer; To take the absolute value; is an exponential function with a natural constant as the base. The model is used to present the inverse proportional relationship and normalization processing. is the input of the model; is the first The final deviation value of the optical signal strength at a certain moment affected by the operation of the transformer.

[0051] It should be noted that when The smaller the value, the smaller the value is. The current value at the moment and the first The closer the current value at each moment is, the closer the current value at each moment is. The time instant is related to the first The closer the moment is, the more likely the deviation of the optical signal strength caused by the transformer operation is a real deviation, not an accidental phenomenon. The difference is smaller than that of the historical cycle, and it is universal. The smaller the correction of the initial deviation value is when weighted, the more likely it is that the deviation is real. right Perform weighted averaging to obtain the first The final deviation value of the optical signal strength at a certain moment affected by the operation of the transformer.

[0052] So far, the first The final deviation value of the optical signal strength at a certain moment affected by the operation of the transformer.

[0053] Step S003, according to the final deviation value and the optical signal strength, obtain the initial impact index of each monitoring point at each moment in each periodic signal segment of the optical signal to which it belongs under the influence of the transformer operation; according to the difference in the initial impact index between the monitoring point and the adjacent monitoring point at each moment in each periodic signal segment of the optical signal to which they belong, and the initial impact index, obtain the final impact index of the optical signal strength of each monitoring point at the current moment under the influence of the transformer operation.

[0054] It should be noted that the above analysis analyzes the final deviation value of the optical signal strength at each moment in each periodic signal segment of each optical signal affected by the operation of the transformer, and then constructs the initial impact index of the optical signal strength at each monitoring point at each moment in each periodic signal segment of the optical signal to which it belongs affected by the operation of the transformer.

[0055] Specifically, according to the final deviation value and the optical signal strength, the initial impact index of each monitoring point at each moment in each periodic signal segment of the optical signal to which it belongs is obtained, which reflects the optical signal strength affected by the operation of the transformer, as follows:

[0056] In the formula, is the first The final deviation value of the optical signal strength at a moment affected by the operation of the transformer; is the first The optical signal strength at a certain moment; To take the absolute value; The monitoring point to be analyzed is the first one in the periodic signal segment to be analyzed of the optical signal to be analyzed. The initial impact indicator of the optical signal strength at a certain moment affected by the operation of the transformer.

[0057] It should be noted that the first The greater the final deviation of the optical signal strength at the moment affected by the transformer operation, the greater the deviation, indicating that the monitoring point to be analyzed is in the first period of the optical signal to be analyzed. The greater the impact of transformer operation on a moment, the greater the initial impact index.

[0058] It should be noted that the above analysis is based on the impact of the transformer on a single monitoring point at a single moment. However, in fact, when the temperature of the outgoing cable is detected through multiple monitoring points, each monitoring point will be affected by other surrounding monitoring points. The closer the fluorescent fiber temperature sensor is to the winding end, the greater the impact of the transformer vibration. At the same time, because of the optical fiber and other equipment connected to it, the vibration of the transformer and cable will be weakened, and the interference at the subsequent farther monitoring points will be relatively small; at the same time, because the monitoring points are relatively close, their actual temperatures are almost the same, so their initial impact indicators will also change with the changes of adjacent monitoring points. Based on this, the degree of influence of each monitoring point on each adjacent monitoring point at each moment in each periodic signal segment of the optical signal to which it belongs is calculated, and the adjacent monitoring points of the monitoring point are first obtained.

[0059] Specifically, several adjacent monitoring points of each monitoring point are obtained, as follows: On the transformer winding outgoing cable, with the monitoring point to be analyzed as the center, the neighborhood radius is Other monitoring points within the range are regarded as adjacent monitoring points of the monitoring point to be analyzed. is a preset first value. In this embodiment, To narrate, The length of the transformer winding outgoing cable in meters.

[0060] Specifically, according to the difference in initial impact index at each moment in each period signal segment of the optical signal to which the monitoring point belongs and the adjacent monitoring point, and the initial impact index, the final impact index of the optical signal strength of each monitoring point at the current moment affected by the transformer operation is obtained, including the following steps: Firstly, according to the difference in initial influence index between the monitoring point and the adjacent monitoring point at each moment in each periodic signal segment of the optical signal to which they belong, the influence degree of each monitoring point by each adjacent monitoring point at each moment in each periodic signal segment of the optical signal to which they belong is obtained.

[0061] Secondly, according to the difference in initial influence index between the monitoring point and all adjacent monitoring points at each moment in each periodic signal segment of their respective optical signals, the credible factor of each monitoring point affected by each adjacent monitoring point at each moment in each periodic signal segment of their respective optical signals is obtained.

[0062] Finally, according to the initial impact index, impact degree and credibility factor, the final impact index of the optical signal strength of each monitoring point at the current moment affected by the transformer operation is obtained.

[0063] Specifically, according to the difference in initial impact index between the monitoring point and the adjacent monitoring point at each moment in each periodic signal segment of the optical signal to which they belong, the degree of influence of each monitoring point by each adjacent monitoring point at each moment in each periodic signal segment of the optical signal to which they belong is obtained, as follows:

[0064] In the formula, is the number of the periodic signal segments to be analyzed and the previous periodic signal segments in the optical signal to be analyzed; The monitoring point to be analyzed is the first In the periodic signal segment The initial impact index of the optical signal strength at a moment on the transformer operation; The monitoring point to be analyzed The adjacent monitoring point is in the first In the periodic signal segment The initial impact index of the optical signal strength at a moment on the transformer operation; The monitoring point to be analyzed is the first one in the periodic signal segment to be analyzed of the optical signal to be analyzed. The optical signal strength at the moment is affected by The influence degree of adjacent monitoring points.

[0065] It should be noted that, ideally, the difference in initial impact indicators of adjacent monitoring points is small. The greater the difference in initial impact indicators between the monitoring point to be analyzed and the adjacent monitoring point at the same time in the corresponding periodic signal segment, the greater the impact of the adjacent monitoring point on the monitoring point to be analyzed, that is, the greater the difference in initial impact indicators between the monitoring point to be analyzed and the adjacent monitoring point at the same time in the corresponding periodic signal segment. The greater the influence of the optical signal strength at the moment is on the 𝑘th adjacent monitoring point.

[0066] It should be noted that, since not every monitoring point will have an impact on the analyzed monitoring point or the impact may be large or small at times, the impact of the monitoring point on the analyzed monitoring point is not necessarily credible. The more stable the impact is, the more credible it is when estimating the degree of impact. Therefore, the stability of this interference in past cycles is used to analyze the credible factor of each monitoring point affected by each adjacent monitoring point at each moment in each periodic signal segment of the optical signal to which it belongs.

[0067] Specifically, according to the difference in initial influence index between the monitoring point and all adjacent monitoring points at each moment in each periodic signal segment of the optical signal to which they belong, the credible factor of each monitoring point affected by each adjacent monitoring point at each moment in each periodic signal segment of the optical signal to which it belongs is obtained, as follows:

[0068] In the formula, is the number of the periodic signal segments to be analyzed and the previous periodic signal segments in the optical signal to be analyzed; The monitoring point to be analyzed is the first In the periodic signal segment The initial impact index of the optical signal strength at a moment on the transformer operation; The monitoring point to be analyzed The adjacent monitoring point is in the first In the periodic signal segment The initial impact index of the optical signal strength at a moment on the transformer operation; is the number of adjacent monitoring points of the monitoring point to be analyzed; To take the absolute value; is the hyperbolic tangent function, used for normalization; The monitoring point to be analyzed is the first one in the periodic signal segment to be analyzed of the optical signal to be analyzed. The moment The credibility factor of the influence of adjacent monitoring points.

[0069] It should be noted that when the fluctuation of the initial impact index difference between the monitoring point and all adjacent monitoring points at each moment in each periodic signal segment of the optical signal to which they belong is smaller, it means that the initial impact index difference in the historical periodic signal segment before the periodic signal segment to be analyzed is basically stable and often occurs. The moment The more credible the impact of the adjacent monitoring points is.

[0070] It should be noted that the above analysis includes the impact of the transformer on the analysis monitoring point and the impact of adjacent monitoring points on the analysis monitoring point. In order to better determine the impact of the transformer operation on the optical signal strength of the monitoring point at the current moment, the impact of all adjacent monitoring points on the analysis monitoring point is considered, combined with the impact of the transformer on the analysis monitoring point at the current moment, and the final impact indicator of the transformer operation on the optical signal strength of each monitoring point at the current moment is analyzed.

[0071] Specifically, according to the initial impact index, the impact degree and the credibility factor, the final impact index of the optical signal strength of each monitoring point at the current moment affected by the transformer operation is obtained, and the optical signal strength at the current moment is the optical signal strength at the last moment of the optical signal of the monitoring point, which is as follows:

[0072] In the formula, is the number of adjacent monitoring points of the monitoring point to be analyzed; The monitoring point to be analyzed An initial impact index of the transformer operation on the optical signal strength of the adjacent monitoring points at the last moment in the last period signal segment of the optical signal; is the degree to which the optical signal intensity of the monitoring point to be analyzed at the last moment in the last period signal segment of the optical signal to be analyzed is affected by the 𝑘th adjacent monitoring point; The monitoring point to be analyzed is the last time the first signal is received in the last period of the optical signal to be analyzed. Credibility factors of the influence of adjacent monitoring points; It is the final impact index of the optical signal intensity of the monitoring point to be analyzed at the last moment in the last cycle signal segment of the optical signal to be analyzed affected by the operation of the transformer.

[0073] It should be noted that It indicates the result of adjusting the initial impact index of the optical signal strength of the monitoring point to be analyzed at the last moment due to the operation of the transformer according to the influence degree of the adjacent monitoring points. When the monitoring point to be analyzed is more affected by the adjacent monitoring points, the initial impact index of the monitoring point to be analyzed should be reduced to reduce the influence of the adjacent monitoring points, and the weighted average is performed through the credible factors affected by the adjacent monitoring points. When the credible factor is larger, it means that the influence of the adjacent monitoring points on the monitoring point to be analyzed is more credible, and its weight is larger, and finally the final impact index of the optical signal strength of the monitoring point to be analyzed at the last moment due to the operation of the transformer is obtained.

[0074] At this point, the final impact index of the optical signal strength of each monitoring point at the current moment affected by the operation of the transformer is obtained.

[0075] Step S004: correct the optical signal strength of the monitoring point at the current moment according to the final influencing index to obtain the final corrected optical signal strength of each monitoring point at the current moment; obtain the real temperature value of each monitoring point at the current moment according to the final corrected optical signal strength of the monitoring point at the current moment.

[0076] It should be noted that after obtaining the final impact index of the optical signal strength of each monitoring point at the current moment affected by the operation of the transformer, the current optical signal strength can be corrected based on it to obtain the final corrected optical signal strength of each monitoring point at the current moment, and then the actual temperature of the monitoring point can be determined based on the final corrected optical signal strength.

[0077] Specifically, the optical signal strength of the monitoring point at the current moment is corrected according to the final influencing index to obtain the final corrected optical signal strength of each monitoring point at the current moment, as follows:

[0078] In the formula, is the optical signal intensity at the last moment of the optical signal to be analyzed; It is the final impact index of the transformer operation on the optical signal strength of the monitoring point to be analyzed at the last moment in the last cycle signal segment of the optical signal to be analyzed; It is the final corrected optical signal strength at the last moment of the optical signal to be analyzed at the monitoring point to be analyzed.

[0079] It should be noted that the last step in the working principle of the fluorescent fiber optic temperature sensor is signal acquisition and analysis: the optical signal reflected or transmitted by the optical fiber is monitored in real time through a spectrum analyzer or optical readout device connected to the optical fiber sensor, and the temperature value is obtained after being processed by the corresponding algorithm. The above obtains the final corrected optical signal strength of each monitoring point at the current moment. Next, the actual temperature of the monitoring point at the current moment can be determined based on the final corrected optical signal strength, thereby completing the temperature detection of the transformer winding outgoing cable.

[0080] Specifically, the real temperature value of each monitoring point at the current moment is obtained according to the final corrected optical signal strength of the monitoring point at the current moment.

[0081] It should be noted that obtaining the true temperature value of each monitoring point at the current moment according to the final corrected optical signal intensity of the monitoring point at the current moment is an existing method of the fluorescent optical fiber temperature sensor, which will not be described in detail in this embodiment.

[0082] Through the above steps, a method for detecting the temperature of a transformer winding outgoing cable is completed.

[0083] Another embodiment of the present invention provides a temperature detection system for a transformer winding outgoing cable, the system comprising a memory and a processor, and when the processor executes a computer program stored in the memory, the processor performs the following operations: Obtain an optical signal from a monitoring point on a transformer winding outgoing cable, wherein the optical signal includes optical signal strengths at several moments; obtain a current signal from a transformer winding outgoing cable, wherein the current signal includes current values ​​at several moments; obtain several periodic signal segments in each optical signal; obtain an initial corrected optical signal strength at each moment in each periodic signal segment based on the optical signal strength and current value at corresponding moments in each periodic signal segment and the previous periodic signal segment; obtain a final deviation value at each moment in each periodic signal segment reflecting the optical signal strength being affected by transformer operation based on the difference between the optical signal strength at each moment in each periodic signal segment and the initial corrected optical signal strength, combined with the current value at the corresponding moment; and obtain a final deviation value at each moment in each periodic signal segment based on the final Deviation value and optical signal strength, obtain the initial impact index of each monitoring point at each moment in each periodic signal segment of the optical signal to which it belongs under the influence of the transformer operation; obtain the final impact index of the optical signal strength of each monitoring point at the current moment affected by the transformer operation according to the difference in initial impact index between the monitoring point and the adjacent monitoring point at each moment in each periodic signal segment of the optical signal to which they belong, and the initial impact index; correct the optical signal strength of the monitoring point at the current moment according to the final impact index, and obtain the final corrected optical signal strength of each monitoring point at the current moment; obtain the real temperature value of each monitoring point at the current moment according to the final corrected optical signal strength of the monitoring point at the current moment.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for detecting the temperature of a transformer winding outgoing cable, characterized in that: The method comprises the following steps: Obtain an optical signal of a monitoring point on the transformer winding outgoing cable, wherein the optical signal includes the optical signal strength at several moments; obtain a current signal of the transformer winding outgoing cable, wherein the current signal includes the current value at several moments; In each optical signal, a number of periodic signal segments are obtained; based on the optical signal strength and current value at the corresponding moment in each periodic signal segment and the previous periodic signal segment, the initial corrected optical signal strength at each moment in each periodic signal segment is obtained; based on the difference between the optical signal strength at each moment in each periodic signal segment and the initial corrected optical signal strength, combined with the current value at the corresponding moment, the final deviation value at each moment in each periodic signal segment reflecting the optical signal strength under the influence of the transformer operation is obtained; According to the final deviation value and the optical signal strength, the initial impact index of each monitoring point at each moment in each periodic signal segment of the optical signal to which it belongs is obtained, which reflects the optical signal strength affected by the operation of the transformer; according to the difference in the initial impact index between the monitoring point and the adjacent monitoring point at each moment in each periodic signal segment of the optical signal to which they belong, and the initial impact index, the final impact index of the optical signal strength of each monitoring point at the current moment affected by the operation of the transformer is obtained; According to the final influencing index, the optical signal strength of the monitoring point at the current moment is corrected to obtain the final corrected optical signal strength of each monitoring point at the current moment; according to the final corrected optical signal strength of the monitoring point at the current moment, the real temperature value of each monitoring point at the current moment is obtained.

2. A method for detecting the temperature of a transformer winding outgoing cable according to claim 1, characterized in that: The specific method of obtaining a plurality of periodic signal segments in each optical signal is as follows: Record any monitoring point as the monitoring point to be analyzed, and record the optical signal of the monitoring point to be analyzed as the optical signal to be analyzed; record the differential signal of the optical signal to be analyzed as the optical differential signal to be analyzed; perform discrete Fourier transform on the optical differential signal to be analyzed to obtain the spectrum of the optical differential signal to be analyzed, use the frequency with the largest amplitude in the spectrum as the reference frequency of the optical differential signal to be analyzed, and use the reciprocal of the reference frequency as the reference period of the optical differential signal to be analyzed; starting from the first signal amplitude in the optical differential signal to be analyzed, obtain a signal segment with the same length as the reference period, which is recorded as the first signal segment; obtain the extreme value closest to the last signal amplitude in the first signal segment in the optical differential signal to be analyzed, which is recorded as the first extreme value, and use the signal segment from the first signal amplitude to the first extreme value in the optical differential signal to be analyzed as the first reference period signal segment of the optical differential signal to be analyzed; Starting from the first extreme value in the optical differential signal to be analyzed, a signal segment with the same length as the reference period is obtained, which is recorded as the second signal segment; in the optical differential signal to be analyzed, an extreme value closest to the last signal amplitude in the second signal segment is obtained, which is recorded as the second extreme value, and the signal segment from the first extreme value to the second extreme value in the optical differential signal to be analyzed is used as the second reference period signal segment of the optical differential signal to be analyzed; By analogy, multiple reference period signal segments of the optical differential signal to be analyzed are obtained; The division moments of all reference periodic signal segments in the optical differential signal to be analyzed are obtained and recorded as key division moments; the optical signal to be analyzed is divided according to all key division moments to obtain a plurality of periodic signal segments of the optical signal to be analyzed.

3. A method for detecting the temperature of a transformer winding outgoing cable according to claim 2, characterized in that: The initial corrected optical signal strength at each moment in each periodic signal segment is obtained according to the optical signal strength and current value at the corresponding moment in each periodic signal segment and the previous periodic signal segment, and the specific steps include the following: Any moment in the optical signal to be analyzed is recorded as the moment to be analyzed; the periodic signal segment to which the optical signal intensity at the moment to be analyzed belongs is recorded as the periodic signal segment to be analyzed; the order value of the moment to be analyzed in the periodic signal segment to be analyzed is recorded as ; ； In the formula, is the number of the periodic signal segments to be analyzed and the previous periodic signal segments in the optical signal to be analyzed; is the first optical signal to be analyzed In the periodic signal segment The current value corresponding to the current signal at a certain moment; is the first optical signal to be analyzed The average value of the current value corresponding to all moments in the current signal within a periodic signal segment; is the first optical signal to be analyzed In the periodic signal segment The optical signal strength at a certain moment; To take the absolute value; is the first The initial corrected optical signal strength at a moment.

4. A method for detecting the temperature of a transformer winding outgoing cable according to claim 3, characterized in that: The method of obtaining the final deviation value at each moment in each periodic signal segment reflecting the influence of the transformer operation on the optical signal strength according to the difference between the optical signal strength at each moment in each periodic signal segment and the initial corrected optical signal strength, combined with the current value at the corresponding moment, includes the following specific steps: ； In the formula, is the first The optical signal strength at a certain moment; is the first The initial deviation value of the optical signal strength at a certain moment affected by the operation of the transformer; According to the initial deviation value and the current value at the corresponding moment, the final deviation value at each moment in each cycle signal segment reflecting the optical signal strength affected by the operation of the transformer is obtained.

5. A method for detecting the temperature of a transformer winding outgoing cable according to claim 4, characterized in that: The method of obtaining the final deviation value at each moment in each periodic signal segment reflecting the optical signal strength under the influence of the transformer operation according to the initial deviation value and the current value at the corresponding moment includes the following specific steps: ； In the formula, is the first The current value corresponding to the current signal at a certain moment; is the first The order value corresponding to the moment in the optical signal to be analyzed; is the first optical signal to be analyzed In the periodic signal segment The order value corresponding to the moment in the optical signal to be analyzed; is the first optical signal to be analyzed In the periodic signal segment The initial deviation value of the optical signal strength at a certain moment affected by the operation of the transformer; is an exponential function with a natural constant as base; is the first The final deviation value of the optical signal strength at a certain moment affected by the operation of the transformer.

6. A method for detecting the temperature of a transformer winding outgoing cable according to claim 5, characterized in that: The method of obtaining, based on the final deviation value and the optical signal strength, an initial impact index reflecting the optical signal strength affected by the operation of the transformer at each monitoring point at each moment in each periodic signal segment of the optical signal to which it belongs includes the following specific steps: ； In the formula, The monitoring point to be analyzed is the first The initial impact indicator of the optical signal strength at a certain moment affected by the operation of the transformer.

7. A method for detecting the temperature of a transformer winding outgoing cable according to claim 2, characterized in that: The method of obtaining the final impact index of the optical signal strength of each monitoring point at the current moment affected by the transformer operation according to the initial impact index difference between the monitoring point and the adjacent monitoring point at each moment in each periodic signal segment of the optical signal to which they belong, and the initial impact index, comprises the following specific steps: ； In the formula, is the number of the periodic signal segments to be analyzed and the previous periodic signal segments in the optical signal to be analyzed; is the monitoring point to be analyzed in the first In the periodic signal segment The initial impact index of the optical signal strength at each moment on the transformer operation; The monitoring point to be analyzed The adjacent monitoring point is in the first In the periodic signal segment The initial impact index of the optical signal strength at each moment on the transformer operation; The monitoring point to be analyzed is the first The optical signal strength at the moment is affected by The degree of influence of adjacent monitoring points; According to the difference in initial influence index between the monitoring point and all adjacent monitoring points at each moment in each periodic signal segment of the optical signal to which they belong, the credible factor of the influence of each monitoring point on each adjacent monitoring point at each moment in each periodic signal segment of the optical signal to which they belong is obtained; According to the initial impact index, impact degree and credibility factor, the final impact index of the optical signal strength of each monitoring point at the current moment affected by the transformer operation is obtained.

8. A method for detecting the temperature of a transformer winding outgoing cable according to claim 7, characterized in that: The method of obtaining the trust factor of each monitoring point affected by each adjacent monitoring point at each moment in each periodic signal segment of the optical signal to which it belongs, based on the difference in initial influence index between the monitoring point and all adjacent monitoring points at each moment in each periodic signal segment of the optical signal to which they belong, comprises the following specific steps: ； In the formula, is the number of adjacent monitoring points of the monitoring point to be analyzed; To take the absolute value; is the hyperbolic tangent function; The monitoring point to be analyzed is the first The moment The credibility factor of the influence of adjacent monitoring points.

9. A method for detecting the temperature of a transformer winding outgoing cable according to claim 7, characterized in that: The method of obtaining the final impact index of the optical signal strength of each monitoring point at the current moment affected by the transformer operation according to the initial impact index, impact degree and credibility factor includes the following specific steps: The optical signal strength at the current moment is the optical signal strength at the last moment of the optical signal at the monitoring point; ； In the formula, is the number of adjacent monitoring points of the monitoring point to be analyzed; The monitoring point to be analyzed An initial impact index of the transformer operation on the optical signal strength of the adjacent monitoring points at the last moment in the last period signal segment of the optical signal; is the degree to which the optical signal intensity of the monitoring point to be analyzed at the last moment in the last period signal segment of the optical signal to be analyzed is affected by the 𝑘th adjacent monitoring point; The monitoring point to be analyzed is the last time the first signal is received in the last period of the optical signal to be analyzed. Credibility factors of the influence of adjacent monitoring points; It is the final impact index of the optical signal intensity at the monitoring point to be analyzed at the last moment in the last cycle signal segment of the optical signal to be analyzed affected by the operation of the transformer.

10. A temperature detection system for transformer winding outgoing cables, the system comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the computer program is executed by a processor, the steps of a method for detecting the temperature of a transformer winding outgoing cable are implemented as described in any one of claims 1 to 9.

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