CN117761419A - Operation state monitoring method for transformer - Google Patents
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000011156 evaluation Methods 0.000 claims abstract description 127
- 230000008859 change Effects 0.000 claims abstract description 28
- 238000010606 normalization Methods 0.000 claims abstract description 6
- 238000012545 processing Methods 0.000 claims abstract description 4
- 238000004804 winding Methods 0.000 claims description 55
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 30
- 239000007789 gas Substances 0.000 claims description 27
- 238000006243 chemical reaction Methods 0.000 claims description 24
- 238000005070 sampling Methods 0.000 claims description 24
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 16
- 229910052739 hydrogen Inorganic materials 0.000 claims description 16
- 239000001257 hydrogen Substances 0.000 claims description 16
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 12
- 230000007613 environmental effect Effects 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 7
- 230000001154 acute effect Effects 0.000 claims description 6
- 239000011261 inert gas Substances 0.000 claims description 6
- 238000005192 partition Methods 0.000 claims description 6
- 229910052721 tungsten Inorganic materials 0.000 claims description 6
- 239000010937 tungsten Substances 0.000 claims description 6
- 238000012937 correction Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 238000006467 substitution reaction Methods 0.000 claims description 3
- 150000002431 hydrogen Chemical class 0.000 claims 1
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The invention discloses a method for monitoring the running state of a transformer, and relates to the technical field of transformer running monitoring; according to the invention, the temperature evaluation indexes of all positions are obtained by comprehensively analyzing the temperature change of all positions in the running state of the transformer, the component temperature evaluation indexes of the current running state of the transformer are obtained by carrying out normalization processing on the temperature evaluation indexes of all positions, and the environment influence indexes of the running state of the transformer are obtained by comprehensively analyzing the obtained component temperature evaluation indexes and the regional temperature evaluation indexes of the region where the transformer is located, so that the running state of the transformer can be more accurately evaluated, the abnormal condition of the transformer can be timely found, and the running safety and reliability of the transformer are improved.
Description
Technical Field
The invention relates to the technical field of operation monitoring of transformers, in particular to a method for monitoring the operation state of a transformer.
Background
A transformer is an electrical device for changing the voltage level of alternating current, and currently, the transformer is one of core devices of an electrical power system, and monitoring and maintaining the operation state of the transformer are critical to the safe and stable operation of the electrical power system.
At present, the running state of a transformer is detected and analyzed, and the transformer is usually detected and analyzed through a single layer, so that the analysis result has one-sided property and singleness, and the running state of the transformer cannot be deeply analyzed;
at present, when the running state of the transformer is detected and analyzed, the analysis of the winding state and the oil tank state in the transformer is often ignored, so that the analysis result is inaccurate and the representativeness is not strong;
for this purpose, a method for monitoring the operating state of a transformer is proposed.
Disclosure of Invention
In view of the above, the present invention provides a method for monitoring the operation state of a transformer, which can implement comprehensive and deep analysis of the operation state of the transformer, so as to solve the problems set forth in the above-mentioned background art.
The aim of the invention can be achieved by the following technical scheme:
s1: based on the oil tank temperature, the winding temperature and the shell temperature of each monitoring time point in the monitoring time period in the current running state of the transformer, the component temperature evaluation index LDS of the transformer corresponding to the current running state is obtained, specifically:
201: the method comprises the steps of setting a plurality of temperature acquisition points R at an oil tank position, a winding position and a shell position respectively, wherein R=1, 2..N, N is the total number of the temperature acquisition points, detecting the temperature value of each temperature acquisition point corresponding to a monitoring time point in the current monitoring time period of a transformer, extracting and integrating the temperature value of each temperature acquisition point i of the oil tank position, each temperature acquisition point i of the winding position and each temperature acquisition point i of the shell position corresponding to each monitoring time point, obtaining the temperature set of each temperature acquisition point of the corresponding position of the transformer, and extracting the most from the temperature set in each temperature acquisition point of the corresponding positionLarge, minimum and median temperatures, respectively labeled KA J R 、KB J R And KC J R Wherein j=1, 2,3; j1, J2 and J3 are respectively expressed as a transformer oil tank position, a winding position and a shell position;
202: the parameters are calculated according to the formula (1) and the formula (2), and the parameters are specifically:
according to formula (1)Calculating to obtain temperature stable values WD in each temperature set of the corresponding position of the transformer J R ；
According to formula (2)Calculating to obtain a temperature evaluation index LG of the corresponding position of the transformer J Wherein WD J R Reference to The reference temperature stable values are expressed as the reference temperature stable values of all temperature acquisition points at the corresponding positions of the transformer; WA (Wireless LAN area) J R 、WB J R And WC (Wolfram carbide) J R KA in each temperature set at corresponding position of transformer J R Summing the mean value, KB J R Sum of the mean and KC J R Summing the mean, WA J R Reference to 、WB J R Reference to And WC (Wolfram carbide) J R Reference to Respectively representing the reference values of the mean values in the corresponding positions of the transformers; a1, a2, a3 and a4 are respectively the temperature plateau WD J R Maximum temperature average WA J R Minimum temperature mean value WB J R Median temperature mean WC J R Is set in the database;
203: temperature evaluation index LG corresponding to each position of transformer J Substitution formulaCalculating to obtain an assembly temperature evaluation index LDS of the transformer in the current monitoring time period; wherein LA is 1 、LA 2 LA 3 Respectively representing reference temperature evaluation indexes of the transformer oil tank position, the winding position and the shell position; b1, b2 and b3 are temperature evaluation indexes LG of each position of the transformer respectively J Is set, the preset influence factor of (a).
In some embodiments, S2: analyzing the temperature of each partition zone of the region where the transformer is located to obtain a region temperature evaluation index of the region where the transformer is located in the current running state of the transformer, and obtaining an environmental impact index HJY based on the component temperature evaluation index LDS and the region temperature evaluation index LDG of the transformer in the current running state of the transformer, wherein the method specifically comprises the following steps:
204: dividing the region of the transformer according to a preset proportion interval according to the specific structure and the installation condition of the transformer, and marking the proportion interval as T, wherein T=1, 2 or 3, and T1, T2 and T3 respectively represent the bottom interval, the middle interval and the top interval of the transformer; for each divided interval, acquiring an interval temperature value of each monitoring time point in a monitoring time period of the transformer in the current running state, removing the highest value and the lowest value of the interval temperature value of each monitoring time point in the corresponding divided interval, and then carrying out mean value calculation on the interval temperature value in the corresponding divided interval to obtain a temperature influence value WP T ；
205: temperature influence value WP in each division section in the region where the transformer is located T And (3) substituting the formula:calculating to obtain an area temperature evaluation index LDG in the area where the current transformer is located, wherein WP 1 Reference to 、WP 2 Reference to WP (tungsten inert gas) 3 Reference to Respectively obtaining optimal temperature values in each divided area of the transformer; WP (WP) Reference temperature difference Representing the reference temperature difference value of each partition section of the region; g1, g2 and g3 are each the temperature influence value WP of each divided section 1 、WP 2 WP (tungsten inert gas) 3 Is set in the database;
206: substituting the component temperature evaluation index LDS and the region temperature evaluation index LDG corresponding to the current running state of the transformer into a public placeThe formula:calculating to obtain an environmental impact index HJY of the transformer in the current running state; wherein LDS Reference to And LDG Reference to Respectively evaluating a reference index for component temperature and a reference index for regional temperature; c1 and c2 are preset influence factors of the component temperature evaluation index LDS and the region temperature evaluation index LDG respectively; alpha is a preset correction factor.
In some embodiments, S3: the current sensor is utilized to collect and analyze the current change condition of the main winding of the transformer in the current running state, and the method specifically comprises the following steps:
401: detecting the current change condition of the main winding of the transformer in the current running state by using a current sensor, substituting the current change condition into a line graph for representation, drawing a numerical value point of a current value corresponding to the line graph at each monitoring time point, and connecting adjacent numerical value points to obtain a current change line; calculating the included angle between each current change line and the horizontal line, setting the threshold value of the acute angle and the obtuse angle, and marking the threshold value as K1 and K2 respectively; when the included angle is an acute angle, marking as K3, comparing the included angle with a corresponding threshold value K1, marking the current change line as a fluctuation line when K3 is larger than K1, and marking as a stable line when K3 is smaller than K1; when the included angle is an obtuse angle, marking as K4, comparing the included angle with a corresponding threshold value K2, marking the current change line as a fluctuation two-line when K4 is smaller than K2, and marking the current change line as a stable two-line when K4 is larger than K2;
402: counting the number of the fluctuation lines and the fluctuation lines, adding the calculated number to obtain the fluctuation number BD, and respectively calculating the slopes of the fluctuation lines and adding the calculated slopes to obtain a fluctuation slope BX;
403: obtaining a stable number BW and a stable slope BL through the step 402; substituting the above parameters into the formula:
calculating to obtain a different current fluctuation value YLB of the main winding of the transformer corresponding to the current running state;
404：temperature evaluation index LG of different current fluctuation value YLB and winding position of transformer in current running state 2 And (3) substituting the formula:
calculating to obtain a winding state evaluation index RZP, wherein YLC is a different current fluctuation reference value; m1 and m2 are respectively the different flow fluctuation value YLB and the temperature evaluation index LG 2 Is set, the preset influence factor of (a).
In some embodiments, S4: the gas sampling equipment is used for sampling and analyzing the gas at each position of the oil tank in the current running state of the transformer, and the method specifically comprises the following steps:
501: sampling gas at each position of the oil tank in the current running state of the transformer by using gas sampling equipment, wherein 3 sampling positions are arranged; the sampling amount is set quantitative DL; pretreating the gas sampled from each position of the oil tank, including adsorption of moisture and filtration of impurities; injecting the treated samples at all positions into chromatographic columns, and separating hydrogen and methane in the samples at all positions by using the set chromatographic columns;
502: detecting the concentration of hydrogen and methane in samples at all positions through a detector connected to the chromatographic column after separation, wherein the amplitude of a response signal generated in the detection process of the detector is in direct proportion to the concentration of each component, and the concentration values of the hydrogen and the methane in the samples at all positions are obtained;
503: calculating the ratio of hydrogen and methane in the samples at each position to the sampling amount DL to obtain the concentration ratio of hydrogen and methane at each position, and adding to obtain the total concentration value NDZ of the samples at each position B The method comprises the steps of carrying out a first treatment on the surface of the Wherein b=1, 2 or 3, ndz 1 、NDZ 2 NDZ 3 Representing the concentration total value of each sampling position;
504: total concentration NDZ of samples at each position B And (3) substituting the formula:
calculating to obtain gas in the current running state of the transformerComponent evaluation index QTP; wherein NDZ is Threshold value Expressed as a concentration threshold; af1, af2 and af3 are respectively preset influencing factors of the concentration total value of each position;
the gas composition evaluation index QTP and the temperature evaluation index LG of the oil tank position of the transformer in the current running state are calculated 1 And (3) substituting the formula:
calculating to obtain an oil tank state evaluation index YXP; wherein QTU is a gas composition evaluation reference index; kp1 and kp2 are the gas composition evaluation index QTP and the temperature evaluation index LG of the tank location, respectively 1 Is set, the preset influence factor of (a).
In some embodiments, S5: the error influence factor mu corresponding to the current running state of the transformer is obtained, and specifically:
601: measuring the input voltage and the output voltage of the transformer corresponding to each monitoring time point in the current monitoring time period by using a voltmeter; respectively adding the input voltage and the output voltage in each monitoring time point and taking the average value to obtain an input average value and an output average value; calculating the ratio between the output average value and the input average value to obtain the actual conversion rate; obtaining rated conversion rate corresponding to the current transformer model, and marking the actual conversion rate and the rated conversion rate as Z1 and Z2 respectively;
and calculating to obtain a conversion rate error WC through a formula WC= - |(Z2-Z1)/Z2 | multiplied by 100%;
602: setting each value range to correspond to an error influence factor mu in the value range corresponding to the conversion rate error matching in the current running state of the transformer, and obtaining the error influence factor mu of the transformer corresponding to the current running state.
In some embodiments, S6: the evaluation grade of the transformer in the current running state is obtained, specifically:
701: substituting the environmental impact index HJY, the winding state evaluation index RZP, the oil tank state evaluation index YXP and the error impact factor mu in the current running state of the transformer into the formula:
calculating to obtain an operation evaluation state index FNB, wherein eh1, eh2, eh3 and eh4 are respectively preset influence factors of an environmental influence index HJY, a winding state evaluation index RZP, an oil tank state evaluation index YXP and an error influence factor mu;
702: substituting the obtained operation evaluation state index FNB into a plurality of threshold ranges, setting operation evaluation grades of each threshold range corresponding to one transformer respectively, obtaining the operation evaluation grade under the current operation state of the transformer, and displaying the operation evaluation grade through a display terminal.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the temperature evaluation indexes of all positions are obtained by comprehensively analyzing the temperature change of all positions in the running state of the transformer, the component temperature evaluation indexes of the current running state of the transformer are obtained by carrying out normalization processing on the temperature evaluation indexes of all positions, and the environment influence indexes of the running state of the transformer are obtained by comprehensively analyzing the obtained component temperature evaluation indexes and the regional temperature evaluation indexes of the region where the transformer is located, so that the running state of the transformer can be more accurately evaluated, the abnormal condition of the transformer can be timely found, and the running safety and reliability of the transformer are improved;
according to the invention, the winding state and the oil tank state of the transformer in the current running state are analyzed to obtain the winding state evaluation index and the oil tank state evaluation index, the running evaluation state index is obtained by comprehensively analyzing the winding state evaluation index and the oil tank state evaluation index with the environmental impact index and the error impact factor of the transformer based on the winding state and the oil tank state evaluation index, and the running evaluation grade of the transformer in the current running state is obtained based on the obtained running evaluation state index, so that the accuracy of an analysis result is further improved.
Drawings
Further details, features and advantages of the present application are disclosed in the following description of exemplary embodiments, with reference to the following drawings, wherein:
fig. 1 is a functional block diagram of the present invention.
Detailed Description
Several embodiments of the present application will be described in more detail below with reference to the accompanying drawings in order to enable those skilled in the art to practice the present application. This application may be embodied in many different forms and objects and should not be limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. The embodiments are not limiting of the present application.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and/or the present specification and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Examples
Referring to fig. 1, a method for monitoring an operation state of a transformer includes the following specific steps:
s1: based on the oil tank temperature, the winding temperature and the shell temperature of each monitoring time point in the monitoring time period in the current running state of the transformer, the component temperature evaluation index LDS of the transformer corresponding to the current running state is obtained, specifically:
201: through setting up a plurality of temperature acquisition points R respectively in oil tank position, winding position and shell position, wherein R=1, 2..N, N is the total number of temperature acquisition points, detects the temperature value that each temperature acquisition point corresponds the monitoring time point in the current monitoring time period of transformer, extracts and integrates each temperature acquisition point i of oil tank position, each temperature acquisition point i of winding position and each temperature acquisition point i of shell position correspond each monitoring time point's temperature value, obtains each temperature acquisition of transformer corresponding positionA temperature set of points, and a maximum temperature, a minimum temperature and a median temperature are extracted from the temperature set in each temperature acquisition point at the corresponding position and are respectively marked as KA J R 、KB J R And KC J R Wherein j=1, 2,3; j1, J2 and J3 are respectively expressed as a transformer oil tank position, a winding position and a shell position;
202: the parameters are calculated according to the formula (1) and the formula (2), and the parameters are specifically:
according to formula (1)Calculating to obtain temperature stable values WD in each temperature set of the corresponding position of the transformer J R ；
According to formula (2)Calculating to obtain a temperature evaluation index LG of the corresponding position of the transformer J Wherein WD J R Reference to The reference temperature stable values are expressed as the reference temperature stable values of all temperature acquisition points at the corresponding positions of the transformer; WA (Wireless LAN area) J R 、WB J R And WC (Wolfram carbide) J R KA in each temperature set at corresponding position of transformer J R Summing the mean value, KB J R Sum of the mean and KC J R Summing the mean, WA J R Reference to 、WB J R Reference to And WC (Wolfram carbide) J R Reference to Respectively representing the reference values of the mean values in the corresponding positions of the transformers; a1, a2, a3 and a4 are respectively the temperature plateau WD J R Maximum temperature average WA J R Minimum temperature mean value WB J R Median temperature mean WC J R Is set in the database;
203: temperature evaluation index LG corresponding to each position of transformer J Substitution formulaCalculating to obtain the transformation voltageThe device corresponds to a component temperature evaluation index LDS in the current monitoring time period; wherein LA is 1 、LA 2 LA 3 Respectively representing reference temperature evaluation indexes of the transformer oil tank position, the winding position and the shell position; b1, b2 and b3 are temperature evaluation indexes LG of each position of the transformer respectively J Is set, the preset influence factor of (a).
S2: analyzing the temperature of each partition zone of the region where the transformer is located to obtain a region temperature evaluation index of the region where the transformer is located in the current running state of the transformer, and obtaining an environmental impact index HJY based on the component temperature evaluation index LDS and the region temperature evaluation index LDG of the transformer in the current running state of the transformer, wherein the method specifically comprises the following steps:
204: dividing the region of the transformer according to a preset proportion interval according to the specific structure and the installation condition of the transformer, and marking the proportion interval as T, wherein T=1, 2 or 3, and T1, T2 and T3 respectively represent the bottom interval, the middle interval and the top interval of the transformer; for each divided interval, acquiring an interval temperature value of each monitoring time point in a monitoring time period of the transformer in the current running state, removing the highest value and the lowest value of the interval temperature value of each monitoring time point in the corresponding divided interval, and then carrying out mean value calculation on the interval temperature value in the corresponding divided interval to obtain a temperature influence value WP T ；
205: temperature influence value WP in each division section in the region where the transformer is located T And (3) substituting the formula:calculating to obtain an area temperature evaluation index LDG in the area where the current transformer is located, wherein WP 1 Reference to 、WP 2 Reference to WP (tungsten inert gas) 3 Reference to Respectively obtaining optimal temperature values in each divided area of the transformer; WP (WP) Reference temperature difference Representing the reference temperature difference value of each partition section of the region; g1, g2 and g3 are each the temperature influence value WP of each divided section 1 、WP 2 WP (tungsten inert gas) 3 Is set in the database;
206: the corresponding component temperature of the transformer in the current running state is setThe formula is substituted between the degree evaluation index LDS and the region temperature evaluation index LDG:calculating to obtain an environmental impact index HJY of the transformer in the current running state; wherein LDS Reference to And LDG Reference to Respectively evaluating a reference index for component temperature and a reference index for regional temperature; c1 and c2 are preset influence factors of the component temperature evaluation index LDS and the region temperature evaluation index LDG respectively; alpha is a preset correction factor.
S3: the current sensor is utilized to collect and analyze the current change condition of the main winding of the transformer in the current running state, and the method specifically comprises the following steps:
401: detecting the current change condition of the main winding of the transformer in the current running state by using a current sensor, substituting the current change condition into a line graph for representation, drawing a numerical value point of a current value corresponding to the line graph at each monitoring time point, and connecting adjacent numerical value points to obtain a current change line; calculating the included angle between each current change line and the horizontal line, setting the threshold value of the acute angle and the obtuse angle, and marking the threshold value as K1 and K2 respectively; when the included angle is an acute angle, marking as K3, comparing the included angle with a corresponding threshold value K1, marking the current change line as a fluctuation line when K3 is larger than K1, and marking as a stable line when K3 is smaller than K1; when the included angle is an obtuse angle, marking as K4, comparing the included angle with a corresponding threshold value K2, marking the current change line as a fluctuation two-line when K4 is smaller than K2, and marking the current change line as a stable two-line when K4 is larger than K2;
402: counting the number of the fluctuation lines and the fluctuation lines, adding the calculated number to obtain the fluctuation number BD, and respectively calculating the slopes of the fluctuation lines and adding the calculated slopes to obtain a fluctuation slope BX;
403: obtaining a stable number BW and a stable slope BL through the step 402; substituting the above parameters into the formula:
calculating to obtain a different current fluctuation value YLB of the main winding of the transformer corresponding to the current running state;
it should be noted that, the main winding is a key component responsible for transmitting electric energy and is usually connected to a main power network, when the current of the main winding changes greatly, the winding may face many influences in aspects of heat, electromagnetic force and the like, which may cause problems of temperature change, thermal stress, mechanical stress and the like of the winding, and the working state of the current main winding can be reflected by analyzing the current change of the main winding corresponding to the current running state.
404: temperature evaluation index LG of different current fluctuation value YLB and winding position of transformer in current running state 2 And (3) substituting the formula:
calculating to obtain a winding state evaluation index RZP, wherein YLC is a different current fluctuation reference value; m1 and m2 are respectively the different flow fluctuation value YLB and the temperature evaluation index LG 2 Is set in the database;
it should be noted that the reference temperature evaluation index LG is determined by the current ripple value YLB of the main winding in the current operating state and the winding position 2 The use state of the winding can be reflected more accurately by further analysis.
S4: the gas sampling equipment is used for sampling and analyzing the gas at each position of the oil tank in the current running state of the transformer, and the method specifically comprises the following steps:
501: sampling gas at each position of the oil tank in the current running state of the transformer by using gas sampling equipment, wherein 3 sampling positions are arranged; the sampling amount is set quantitative DL; pretreating the gas sampled from each position of the oil tank, including adsorption of moisture and filtration of impurities; injecting the treated samples at all positions into chromatographic columns, and separating hydrogen and methane in the samples at all positions by using the set chromatographic columns;
it should be noted that, detecting and monitoring the concentration of hydrogen gas can help to determine the internal conditions of the transformer, such as partial discharge or overheating;
detecting and monitoring the concentration of hydrogen can help to determine conditions inside the transformer, such as damage to the insulation, partial discharge or failure;
by being provided with a plurality of sampling positions, the data accuracy is lower due to the fact that a single sampling position is avoided.
502: detecting the concentration of hydrogen and methane in samples at all positions through a detector connected to the chromatographic column after separation, wherein the amplitude of a response signal generated in the detection process of the detector is in direct proportion to the concentration of each component, and the concentration values of the hydrogen and the methane in the samples at all positions are obtained;
503: calculating the ratio of hydrogen and methane in the samples at each position to the sampling amount DL to obtain the concentration ratio of hydrogen and methane at each position, and adding to obtain the total concentration value NDZ of the samples at each position B The method comprises the steps of carrying out a first treatment on the surface of the Wherein b=1, 2 or 3, ndz 1 、NDZ 2 NDZ 3 Representing the concentration total value of each sampling position;
504: total concentration NDZ of samples at each position B And (3) substituting the formula:
calculating to obtain a gas component evaluation index QTP under the current running state of the transformer; wherein NDZ is Threshold value Expressed as a concentration threshold; af1, af2 and af3 are respectively preset influencing factors of the concentration total value of each position;
the gas composition evaluation index QTP and the temperature evaluation index LG of the oil tank position of the transformer in the current running state are calculated 1 And (3) substituting the formula:
calculating to obtain an oil tank state evaluation index YXP; wherein QTU is a gas composition evaluation reference index; kp1 and kp2 are the gas composition evaluation index QTP and the temperature evaluation index LG of the tank location, respectively 1 Is set, the preset influence factor of (a).
S5: the error influence factor mu corresponding to the current running state of the transformer is obtained, and specifically:
601: measuring the input voltage and the output voltage of the transformer corresponding to each monitoring time point in the current monitoring time period by using a voltmeter; respectively adding the input voltage and the output voltage in each monitoring time point and taking the average value to obtain an input average value and an output average value; calculating the ratio between the output average value and the input average value to obtain the actual conversion rate; obtaining rated conversion rate corresponding to the current transformer model, and marking the actual conversion rate and the rated conversion rate as Z1 and Z2 respectively;
and calculating to obtain a conversion rate error WC through a formula WC= - |(Z2-Z1)/Z2 | multiplied by 100%;
602: setting each value range to correspond to an error influence factor mu in a value range corresponding to the conversion rate error matching under the current running state of the transformer, and obtaining the error influence factor mu of the transformer corresponding to the current running state;
s6: the evaluation grade of the transformer in the current running state is obtained, specifically:
701: substituting the environmental impact index HJY, the winding state evaluation index RZP, the oil tank state evaluation index YXP and the error impact factor mu in the current running state of the transformer into the formula:
calculating to obtain an operation evaluation state index FNB, wherein eh1, eh2, eh3 and eh4 are respectively preset influence factors of an environmental influence index HJY, a winding state evaluation index RZP, an oil tank state evaluation index YXP and an error influence factor mu;
702: substituting the obtained operation evaluation state index FNB into a plurality of threshold ranges, setting operation evaluation grades of each threshold range corresponding to one transformer respectively, obtaining the operation evaluation grade under the current operation state of the transformer, and displaying the operation evaluation grade through a display terminal.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (7)
1. A method for monitoring an operating condition of a transformer, comprising:
s1: based on the oil tank temperature, the winding temperature and the shell temperature of each monitoring time point in the monitoring time period in the current running state of the transformer, obtaining a component temperature evaluation index of the transformer corresponding to the current running state;
s2: analyzing the temperature of each partition zone of the area where the transformer is located to obtain an area temperature evaluation index of the area where the transformer is located in the current running state of the transformer, and obtaining an environment influence index based on the component temperature evaluation index and the area temperature evaluation index of the transformer in the current running state of the transformer;
s3: collecting and analyzing the current change condition of the main winding of the transformer in the current running state by using a current sensor to obtain a different current fluctuation value of the main winding of the transformer corresponding to the current running state, and obtaining a winding state evaluation index based on the different current fluctuation value of the transformer in the current running state and a reference temperature evaluation index of the winding position;
s4: sampling the gas at each position of the oil tank in the current running state of the transformer by using a gas sampling device, analyzing to obtain the concentration total value of each position sample, and carrying out normalization treatment among the concentration total values of each position sample to obtain a gas component evaluation index in the current running state of the transformer; obtaining an oil tank state evaluation index based on the gas component evaluation index of the transformer in the current running state and the reference temperature evaluation index of the oil tank position;
s5: calculating the actual conversion rate of the transformer in the current running state, obtaining the rated conversion rate corresponding to the current transformer model, calculating to obtain conversion rate errors through a formula, and matching the conversion rate errors of the transformer in the current running state with the conversion rate errors in the corresponding value range to obtain error influence factors of the transformer in the current running state;
s6: and normalizing the environment influence index, the winding state evaluation index, the oil tank state evaluation index and the error influence factor of the current running state of the transformer to obtain a running evaluation state index, substituting the obtained running evaluation state index into a plurality of threshold ranges to obtain a running evaluation grade of the current running state of the transformer, and displaying the running evaluation grade through a display terminal.
2. The method for monitoring the operation state of the transformer according to claim 1, wherein the analysis of the oil tank temperature, the winding temperature and the shell temperature at each monitoring time point in the monitoring time period under the current operation state of the transformer is specifically as follows:
201: the method comprises the steps of respectively setting a plurality of temperature acquisition points R at the oil tank position, the winding position and the shell position, wherein R=1, 2..N, N is the total number of the temperature acquisition points, detecting the temperature values of the temperature acquisition points corresponding to the monitoring time points in the current monitoring time period of the transformer, extracting and integrating the temperature values of the temperature acquisition points i of the oil tank position, the temperature acquisition points i of the winding position and the temperature values of the temperature acquisition points i of the shell position corresponding to the monitoring time points, obtaining a temperature set of the temperature acquisition points of the transformer corresponding to the positions, extracting the maximum temperature, the minimum temperature and the median temperature from the temperature set of the temperature acquisition points of the corresponding positions, and respectively marking the maximum temperature, the minimum temperature and the median temperature as KA J R 、KB J R And KC J R Wherein j=1, 2,3; j1, J2 and J3 are respectively expressed as a transformer oil tank position, a winding position and a shell position;
202: the parameters are calculated according to the formula (1) and the formula (2), and the parameters are specifically:
according to formula (1)Calculating to obtain temperature stable values WD in each temperature set of the corresponding position of the transformer J R ；
According to formula (2)Calculating to obtain a temperature evaluation index LG of the corresponding position of the transformer J Wherein WD J R Reference to The reference temperature stable values are expressed as the reference temperature stable values of all temperature acquisition points at the corresponding positions of the transformer; WA (Wireless LAN area) J R 、WB J R And WC (Wolfram carbide) J R KA in each temperature set at corresponding position of transformer J R Summing the mean value, KB J R Sum of the mean and KC J R Summing the mean, WA J R Reference to 、WB J R Reference to And WC (Wolfram carbide) J R Reference to Respectively representing the reference values of the mean values in the corresponding positions of the transformers; a1, a2, a3 and a4 are respectively the temperature plateau value and the temperature plateau value WD J R Maximum temperature average WA J R Minimum temperature mean value WB J R Median temperature mean WC J R Is set in the database;
203: temperature evaluation index LG corresponding to each position of transformer J Substitution formulaCalculating to obtain a component temperature evaluation index LDS of the transformer in the current monitoring time period; wherein LA is 1 、LA 2 LA 3 Respectively representing reference temperature evaluation indexes of the transformer oil tank position, the winding position and the shell position; b1, b2 and b3 are temperature evaluation indexes LG of each position of the transformer respectively J Is set, the preset influence factor of (a).
3. The method for monitoring the operation state of a transformer according to claim 2, wherein the usage environment impact index of the transformer corresponding to the current monitoring time point is obtained, specifically:
204: according to the specific structure and the specific structure of the transformerDividing the region of the transformer according to a preset proportion interval, and marking the proportion interval as T, wherein T=1, 2 or 3, and T1, T2 and T3 respectively represent a bottom interval, a middle interval and a top interval of the transformer; for each divided interval, acquiring an interval temperature value of each monitoring time point in a monitoring time period of the transformer in the current running state, removing the highest value and the lowest value of the interval temperature value of each monitoring time point in the corresponding divided interval, and then carrying out mean value calculation on the interval temperature value in the corresponding divided interval to obtain a temperature influence value WP T ；
205: temperature influence value WP in each division section in the region where the transformer is located T And (3) substituting the formula:calculating to obtain an area temperature evaluation index LDG in the area where the current transformer is located, wherein WP 1 Reference to 、WP 2 Reference to WP (tungsten inert gas) 3 Reference to Respectively obtaining optimal temperature values in each divided area of the transformer; WP (WP) Reference temperature difference Representing the reference temperature difference value of each partition section of the region; g1, g2 and g3 are each the temperature influence value WP of each divided section 1 、WP 2 WP (tungsten inert gas) 3 Is set in the database;
206: substituting the component temperature evaluation index LDS and the region temperature evaluation index LDG corresponding to the current running state of the transformer into a formula:calculating to obtain an environmental impact index HJY of the transformer in the current running state; wherein LDS Reference to And LDG Reference to Respectively evaluating a reference index for component temperature and a reference index for regional temperature; c1 and c2 are preset influence factors of the component temperature evaluation index LDS and the region temperature evaluation index LDG respectively; />Is a preset correction factor.
4. A method for monitoring the operation state of a transformer according to claim 3, wherein the analysis of the winding state of the transformer in the current operation state is specifically:
401: detecting the current change condition of the main winding of the transformer in the current running state by using a current sensor, substituting the current change condition into a line graph for representation, drawing a numerical value point of a current value corresponding to the line graph at each monitoring time point, and connecting adjacent numerical value points to obtain a current change line; calculating the included angle between each current change line and the horizontal line, setting the threshold value of the acute angle and the obtuse angle, and marking the threshold value as K1 and K2 respectively; when the included angle is an acute angle, marking as K3, comparing the included angle with a corresponding threshold value K1, marking the current change line as a fluctuation line when K3 is larger than K1, and marking as a stable line when K3 is smaller than K1; when the included angle is an obtuse angle, marking as K4, comparing the included angle with a corresponding threshold value K2, marking the current change line as a fluctuation two-line when K4 is smaller than K2, and marking the current change line as a stable two-line when K4 is larger than K2;
402: counting the number of the fluctuation first line and the fluctuation second line, adding to obtain the fluctuation number, and respectively calculating the slopes of the fluctuation first line and the fluctuation second line, and adding to obtain the fluctuation slope;
403: obtaining a stable number and a stable slope through step 402; normalizing the parameters to obtain a different-current fluctuation value of the main winding of the transformer corresponding to the current running state;
404: temperature evaluation index LG of different current fluctuation value and winding position of transformer in current running state 2 And carrying out normalization processing to obtain a winding state evaluation index.
5. The method for monitoring the operation state of a transformer according to claim 4, wherein the analysis of the state of the oil tank in the current operation state of the transformer is specifically:
501: the gas sampling equipment is used for sampling the gas at each position of the oil tank in the current running state of the transformer, and the sampling quantity is set quantitative; pretreating the gas sampled from each position of the oil tank, including adsorption of moisture and filtration of impurities; injecting the treated samples at all positions into chromatographic columns, and separating hydrogen and methane in the samples at all positions by using the set chromatographic columns;
502: detecting the concentration of hydrogen and methane in samples at all positions through a detector connected to the chromatographic column after separation, wherein the amplitude of a response signal generated in the detection process of the detector is in direct proportion to the concentration of each component, and the concentration values of the hydrogen and the methane in the samples at all positions are obtained;
503: calculating the ratio of hydrogen, methane and sampling amount in the samples at each position to obtain the concentration ratio of the hydrogen to the methane at each position, and adding to obtain the concentration total value of the samples at each position;
504: normalizing the concentration total values of the samples at each position to obtain a gas component evaluation index in the current running state of the transformer; gas composition evaluation index and temperature evaluation index LG of oil tank position under current operation state of transformer 1 And (5) carrying out normalization treatment to obtain an oil tank state evaluation index.
6. The method for monitoring the operation state of a transformer according to claim 5, wherein the analysis of the conversion error of the current operation state of the transformer is specifically:
601: measuring the input voltage and the output voltage of the transformer corresponding to each monitoring time point in the current monitoring time period by using a voltmeter; respectively adding the input voltage and the output voltage in each monitoring time point and taking the average value to obtain an input average value and an output average value; calculating the ratio between the output average value and the input average value to obtain the actual conversion rate; obtaining rated conversion rate corresponding to the current transformer model, and marking the actual conversion rate and the rated conversion rate as Z1 and Z2 respectively;
and calculating to obtain a conversion rate error WC through a formula WC= - |(Z2-Z1)/Z2 | multiplied by 100%;
602: setting each value range to correspond to an error influence factor mu in the value range corresponding to the conversion rate error matching in the current running state of the transformer, and obtaining the error influence factor mu of the transformer corresponding to the current running state.
7. The method for monitoring the operation state of a transformer according to claim 6, wherein an evaluation level of the current operation state of the transformer is obtained:
701: performing normalization processing on an environmental impact index HJY, a winding state evaluation index, an oil tank state evaluation index and an error impact factor mu of the current running state of the transformer to obtain a running evaluation state index;
702: substituting the obtained operation evaluation state indexes into a plurality of threshold ranges, setting operation evaluation grades of each threshold range corresponding to one transformer respectively, obtaining the operation evaluation grade under the current operation state of the transformer, and displaying the operation evaluation grade through a display terminal.
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