CN103278244B - The monitoring method of overheat fault of transformer and monitoring system thereof - Google Patents
The monitoring method of overheat fault of transformer and monitoring system thereof Download PDFInfo
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Abstract
The invention belongs to electric apparatus monitoring technical field, relate to a kind of monitoring method and monitoring system thereof of overheat fault of transformer.It solve the technical matterss such as prior art is reasonable not.This monitoring method comprises the steps: A, thermograph collection; B, image identification process; C, breakdown judge and process.Its advantage is: the mode adopting contactless monitoring, carries out identification to the image information gathered, and realizes the quick detection and diagnosis of the position to the early stage incipient fault of transformer, degree and type, has security, reliability, efficiently feature.Simultaneously, utilize contactless monitor mode, do not affect transformer run prerequisite under provide condition for transformer realizes round-the-clock status monitoring, ensure that equipment safe, stable, run reliably, the required level of service of General Promotion transformer, reduces O&M cost.System is reasonable, and structure is simple, and good operating stability, fault recall rate is high.
Description
Technical field
The invention belongs to electric apparatus monitoring technical field, relate to transformer monitoring, especially relate to a kind of monitoring method and monitoring system thereof of overheat fault of transformer.
Background technology
Electric system is just in the evolutionary process of the development of continuous technical renovation all the time from it is born.The current continuous growth due to electricity needs, the rising of power cost; National environmental protection pressure increase; The continuous proposition of electric power correlation technique and standard, country is more and more higher to the requirement of power system security, stability and economy, and traditional electric system is faced with increasing challenge.Be badly in need of improving in global environment situation, today of new energy development development, for realizing sustainable development and regenerative resource proportion constantly increases and the transformation of power generation mode, the further investigation of " intelligent grid " becomes important directions and the inexorable trend of 21 century various countries' development.
Relatively more conventional is adopt handheld thermal imager regularly to carry out manual inspection to power equipment at present, this mode makes monitoring person works measure greatly, protect electricity before adding joint, meet the unplanned thermometric work such as kurtosis vacation, cause monitoring personnel easily tired, add the insecurity of work, also reduce the recall rate of equipment failure simultaneously.In addition, because power system development is very fast in recent years, power equipment is more, and some transformer station is far away, thus cause thermometric often not carry out at load boom period, so that part thermal defect can not be found in time, also reduces the recall rate of equipment failure equally.
For this reason, people have carried out long-term exploration, propose various solution.Such as, Chinese patent literature discloses a kind of transformer temperature check test device and temperature monitoring system fault checking method [application number: 201210531381.7], and device comprises resistance input terminal, power and energy hand the temperature transmitter of the precision resister group be made up of multiple resistance of, temperature transmitter input terminal, simulation device being tested thermistor, simulation device being tested temperature transmitter, DC power supply terminal, temperature transmitter lead-out terminal and casing; The associated terminal of the resistance input terminal of resistance input terminal, temperature transmitter input terminal, precision resister group, temperature transmitter connection function change-over lever respectively connects, and the resistance lead-out terminal of temperature transmitter connects with temperature transmitter lead-out terminal, DC power supply terminal respectively with DC power supply terminal.Somebody has invented a kind of distribution transformer failure monitoring terminal [application number: 201020257078.9], comprise main control chip, the signal input part of main control chip connects for gathering three-phase current, the three-phase current of voltage signal, voltage input circuit, and for gathering the switching signal input circuit of killer switch position signalling, the signal output part of main control chip is connected with isolating switch, the signal output part of main control chip and main website communication.
Although such scheme improves monitoring efficiency and monitoring reliability to a certain extent, still there is the ubiquitous technical matters of prior art, such as automaticity is lower, and it is convenient not that operation uses, and fault recall rate is lower.
Summary of the invention
The object of the invention is for the problems referred to above, provide a kind of easy to implement, do not affect transformer and normally work, the monitoring method of the overheat fault of transformer that fault recall rate is high.
Another object of the present invention is to provide a kind of reasonable in design, and structure is simple, the monitoring system of the overheat fault of transformer of good operating stability.
For achieving the above object, present invention employs following technical proposal: the monitoring method of overheat fault of transformer, is characterized in that, this monitoring method comprises the steps:
A, thermograph collection: carry out contactless monitoring to transformer region of easily breaking down, the transformer thermograph in acquisition monitoring region, then transfers to industrial computer;
B, image identification process: the transformer thermograph collected is carried out identification process by industrial computer, judge whether transformer exists overheating fault;
C, breakdown judge and process: if monitored transformer does not exist overheating fault, then proceed monitoring; If monitored transformer exists overheating fault, then send alerting signal.
Transformer belongs to high-voltage product, and the present invention adopts the method for contactless monitoring, ensures the safety of personnel.Transformer in the present invention region of easily breaking down refers to the regions such as bushing.The present invention adopts the mode of contactless monitoring, based on image identification, can realize the position to the early stage potential overheating fault of transformer, the quick identification of degree and type and diagnosis.
In the detection method of above-mentioned overheat fault of transformer, in above-mentioned steps A, utilize infrared thermal imaging video camera to gather transformer easily to break down the transformer thermograph in region, and the original image of described transformer thermograph is the 256 color shade figure of 0-255, be rgb color by described infrared thermal imaging video camera False color mapping by YUV color translation, then obtained the transformer thermograph of corresponding relevant temperature by rgb color and temperature map.
In the detection method of above-mentioned overheat fault of transformer, in above-mentioned steps A, described YUV color translation is the conversion formula of rgb color:
R＝Y+1.402*(U-128)；
G＝Y-0.344414*(V-128)-0.71414*(U-128)；
B＝Y+1.772*(V-128)；
In formula, Y is luminance signal, U is the first carrier chrominance signal, V is the second carrier chrominance signal, R is red intensity value, G is green intensity value, B is blue intensity values.
In the detection method of above-mentioned overheat fault of transformer, described transformer thermograph is m*n rank matrix pixel figure, m and n is positive integer, and m represents the pixel count on transformer thermograph horizontal line, and n represents transformer thermograph horizontal line quantity.
In the detection method of above-mentioned overheat fault of transformer, in above-mentioned step B, average computation is weighted to the gray-scale value of each pixel of transformer thermograph, obtain the weighted mean gray-scale value of the transformer thermograph of guarded region, then the overheating fault threshold values of weighted mean gray-scale value and setting is compared, if weighted mean gray-scale value is less than or equal to overheating fault threshold values, judge not occur overheating fault, if weighted mean gray-scale value is greater than overheating fault threshold values, judge to occur overheating fault.
In the detection method of above-mentioned overheat fault of transformer, described weighted mean gray-scale value and overheating fault threshold values represent with number percent respectively, and the gray-scale value of described overheating fault threshold values is 10%; If weighted mean gray-scale value≤10%, judge not occur overheating fault, if weighted mean gray-scale value > 10%, judge to occur overheating fault.Namely the temperature value of gray-scale value corresponding to 10% is the threshold temperature of overheat fault of transformer, exceed this temperature weighted average gray value > 10% to judge to occur overheating fault, be less than or equal to this temperature weighted average gray value≤10% and judge not occur overheating fault.
Alternatively, in the detection method of above-mentioned overheat fault of transformer, described overheating fault threshold values is according to the influence factor adjustment comprising load, environment temperature, ambient humidity collected.The temperature in transformer control region can change along with conditions such as room temperature, weather, loads, and the temperature producing fault also changes thereupon, and this programme adopts the overheating fault threshold values of change for this reason.In addition, when carrying out thermograph breakdown judge, the filter condition that setting judges is: room temperature is than≤10%; 24 hours time.The picture satisfied condition before guarded region transformer thermograph and 24 hours is contrasted, if do not meet, skips.Meet filter settings condition, breakdown judge is set to gray-scale value≤10%, meets this scope then non-fault, proceeds monitoring; As more than 10%, then represent that guarded region breaks down.
In the detection method of above-mentioned overheat fault of transformer, if judge there is overheating fault in transformer control region, then carry out sound and light alarm and/or by the mode of SMS alarm, failure message is sent to SMS (Short Messaging Service) receiving terminal; Information bank is set up, to judge transformer fault grade and type according to transformer thermograph; When the transformer thermograph in acquisition monitoring region, carry out the monitoring that can collect transformer thermograph in real time, if transformer thermograph cannot be collected, restarting equipment or restart system.
The monitoring system of overheat fault of transformer, it is characterized in that, native system comprises at least one and is arranged on transformer and easily breaks down the infrared thermal imaging video camera that can gather transformer thermograph in region, described infrared thermal imaging video camera is connected with industrial computer by wireless and/or wire communication mode, described industrial computer is connected with alarm mechanism and monitoring terminal.
In the monitoring system of above-mentioned overheat fault of transformer, described industrial computer is also connected with the server for storing transformer thermograph; Described alarm mechanism comprise in acoustic-optic alarm, SMS (Short Messaging Service) receiving terminal any one or multiple; Described industrial computer is also connected with in the load detection device for detecting transformer load, the temperature-detecting device for testing environment temperature, the humidity detector for testing environment humidity any one or multiple.
Compared with prior art, the monitoring method of this overheat fault of transformer and the advantage of monitoring system thereof are: the mode adopting contactless monitoring, identification is carried out to the image information gathered, realize, to the quick detection and diagnosis of the position of the early stage incipient fault of transformer, degree and type, there is security, reliability, efficiently feature.Simultaneously, utilize contactless monitor mode, do not affect transformer run prerequisite under provide condition for transformer realizes round-the-clock status monitoring, ensure that equipment safe, stable, run reliably, the required level of service of General Promotion transformer, reduces O&M cost.System is reasonable, and structure is simple, and good operating stability, fault recall rate is high.
Accompanying drawing explanation
Fig. 1 is network topology structure schematic diagram provided by the invention;
Fig. 2 is infrared thermal imaging simplifying plan relation schematic diagram provided by the invention;
Fig. 3 is the process flow diagram of overheat fault of transformer provided by the invention monitoring.
In figure, transformer 1, infrared thermal imaging video camera 2, industrial computer 3, alarm mechanism 4, acoustic-optic alarm 41, SMS (Short Messaging Service) receiving terminal 42, monitoring terminal 5, server 6.
Embodiment
As Figure 1-3, the monitoring method of this overheat fault of transformer, this monitoring method comprises the steps:
A, thermograph collection: carry out contactless monitoring to transformer region of easily breaking down, the transformer thermograph in acquisition monitoring region, then transfers to industrial computer; B, image identification process: the transformer thermograph collected is carried out identification process by industrial computer, judge whether transformer exists overheating fault; C, breakdown judge and process: if monitored transformer does not exist overheating fault, then proceed monitoring; If monitored transformer exists overheating fault, then send alerting signal.Transformer belongs to high-voltage product, and the present invention adopts the method for contactless monitoring, ensures the safety of personnel.Transformer in the present invention region of easily breaking down refers to the regions such as bushing.The present invention adopts the mode of contactless monitoring, based on image identification, can realize the position to the early stage potential overheating fault of transformer, the quick identification of degree and type and diagnosis.
In above-mentioned steps A, utilize infrared thermal imaging video camera to gather transformer easily to break down the transformer thermograph in region, and the original image of described transformer thermograph is the 256 color shade figure of 0-255, be rgb color by described infrared thermal imaging video camera False color mapping by YUV color translation, then obtained the transformer thermograph of corresponding relevant temperature by rgb color and temperature map.In above-mentioned steps A, described YUV color translation is the conversion formula of rgb color:
R＝Y+1.402*(U-128)；
G＝Y-0.344414*(V-128)-0.71414*(U-128)；
B＝Y+1.772*(V-128)；
In formula, Y is luminance signal, U is the first carrier chrominance signal, V is the second carrier chrominance signal, R is red intensity value, G is green intensity value, B is blue intensity values.Namely gray scale is to the mapping table of color.According to color map, be converted into relevant temperature and represent, namely complete the mapping table of color to temperature.Like this, by the mapping of---color---temperature to gray scale, can carry out identification preferably by thermal imaging picture to the fault of guarded region, running for transformer safety provides quality assurance.
Transformer thermograph is m*n rank matrix pixel figure, m and n is positive integer, and m represents the pixel count on transformer thermograph horizontal line, and n represents transformer thermograph horizontal line quantity.
In above-mentioned step B, average computation is weighted to the gray-scale value of each pixel of transformer thermograph, obtain the weighted mean gray-scale value of the transformer thermograph of guarded region, then the overheating fault threshold values of weighted mean gray-scale value and setting is compared, if weighted mean gray-scale value is less than or equal to overheating fault threshold values, judge not occur overheating fault, if weighted mean gray-scale value is greater than overheating fault threshold values, judge to occur overheating fault.Weighted mean gray-scale value and overheating fault threshold values represent with number percent respectively, and the gray-scale value of overheating fault threshold values is 10%; If weighted mean gray-scale value≤10%, judge not occur overheating fault, if weighted mean gray-scale value > 10%, judge to occur overheating fault.
If judge there is overheating fault in transformer control region, then carry out sound and light alarm and/or by the mode of SMS alarm, failure message is sent to SMS (Short Messaging Service) receiving terminal; Information bank is set up, to judge transformer fault grade and type according to transformer thermograph; When the transformer thermograph in acquisition monitoring region, carry out the monitoring that can collect transformer thermograph in real time, if transformer thermograph cannot be collected, restarting equipment or restart system.
Alternatively, overheating fault threshold values is according to the influence factor adjustment comprising load, environment temperature, ambient humidity collected.The temperature in transformer control region can change along with conditions such as room temperature, weather, loads, and the temperature producing fault also changes thereupon, and this programme adopts the overheating fault threshold values of change for this reason.In addition, when carrying out thermograph breakdown judge, the filter condition that setting judges is: room temperature is than≤10%; 24 hours time.The picture satisfied condition before guarded region transformer thermograph and 24 hours is contrasted, if do not meet, skips.Meet filter settings condition, breakdown judge is set to gray-scale value≤10%, meets this scope then non-fault, proceeds monitoring; As more than 10%, then represent that guarded region breaks down.
Specifically:
1. according to the selection of guarded region, the infrared thermal imaging video camera of correct position is installed, setting guarded region, if selected transformer high-voltage bushing is guarded region, m*n rank matrix area;
2. gather the transformer thermograph (monitoring figure) of transformer high-voltage bushing guarded region, be transferred to industrial computer by wire transmission mode;
3. according to the transformer thermograph gathered (monitoring figure), based on the gray-scale value of image, image is processed, extract the gray-scale value of each point of m*n rank matrix guarded region;
4. by m*n rank matrix guarded region gray-scale value weighted mean, the weighted mean gray-scale value of guarded region is obtained;
5. filtrator is compared in setting, and condition sets: room temperature is than≤10%; 24 hours time, the picture satisfied condition before the guarded region gray-scale value picture of 4. step gained and 24 hours is contrasted, if do not meet, skip;
6. breakdown judge, during as 5. contrasted, meet filter settings condition, breakdown judge is set to gray-scale value≤10%, meets this scope then non-fault, proceeds monitoring; As more than 10%, then represent that guarded region breaks down;
7., in 6., if judge there is overheating fault in transformer control region, then system carries out sound and light alarm, and by the mode of SMS alarm, failure message is sent to relevant operator on duty.
8. pertinent image information result is transferred to data server to preserve, and by making related personnel can observe overheat fault of transformer monitored results at any time, ensures the safe and stable operation of transformer.
The monitoring system of this overheat fault of transformer comprises at least one and is arranged on transformer 1 and easily breaks down the infrared thermal imaging video camera 2 that can gather transformer thermograph in region, described infrared thermal imaging video camera 2 is connected with industrial computer 3 by wireless and/or wire communication mode, described industrial computer 3 is connected with alarm mechanism 4 and monitoring terminal 5.Industrial computer 3 is also connected with the server 6 for storing transformer thermograph; Described alarm mechanism 4 comprise in acoustic-optic alarm 41, SMS (Short Messaging Service) receiving terminal 42 any one or multiple; Described industrial computer 3 is also connected with in the load detection device for detecting transformer load, the temperature-detecting device for testing environment temperature, the humidity detector for testing environment humidity any one or multiple.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Although more employ the terms such as transformer 1, infrared thermal imaging video camera 2, industrial computer 3, alarm mechanism 4, acoustic-optic alarm 41, SMS (Short Messaging Service) receiving terminal 42, monitoring terminal 5, server 6 herein, do not get rid of the possibility using other term.These terms are used to be only used to describe and explain essence of the present invention more easily; The restriction that they are construed to any one additional is all contrary with spirit of the present invention.
Claims (3)
1. a monitoring method for overheat fault of transformer, is characterized in that, this monitoring method comprises the steps:
A, thermograph collection: carry out contactless monitoring to transformer region of easily breaking down, the transformer thermograph in acquisition monitoring region, then transfers to industrial computer;
B, image identification process: the transformer thermograph collected is carried out identification process by industrial computer, judge whether transformer exists overheating fault;
C, breakdown judge and process: if monitored transformer does not exist overheating fault, then proceed monitoring; If monitored transformer exists overheating fault, then send alerting signal;
In above-mentioned steps A, utilize infrared thermal imaging video camera to gather transformer easily to break down the transformer thermograph in region, and the original image of described transformer thermograph is the 256 color shade figure of 0-255, be rgb color by described infrared thermal imaging video camera False color mapping by YUV color translation, then obtained the transformer thermograph of corresponding relevant temperature by rgb color and temperature map;
In above-mentioned steps A, described YUV color translation is the conversion formula of rgb color:
R＝Y+1.402*(U-128)；
G＝Y-0.344414*(V-128)-0.71414*(U-128)；
B＝Y+1.772*(V-128)；
In formula, Y is luminance signal, U is the first carrier chrominance signal, V is the second carrier chrominance signal, R is red intensity value, G is green intensity value, B is blue intensity values;
Described transformer thermograph is m*n rank matrix pixel figure, m and n is positive integer, and m represents the pixel count on transformer thermograph horizontal line, and n represents transformer thermograph horizontal line quantity;
In above-mentioned step B, average computation is weighted to the gray-scale value of each pixel of transformer thermograph, obtain the weighted mean gray-scale value of the transformer thermograph of guarded region, then the overheating fault threshold values of weighted mean gray-scale value and setting is compared, if weighted mean gray-scale value is less than or equal to overheating fault threshold values, judge not occur overheating fault, if weighted mean gray-scale value is greater than overheating fault threshold values, judge to occur overheating fault;
If judge there is overheating fault in transformer control region, then carry out sound and light alarm and/or by the mode of SMS alarm, failure message is sent to SMS (Short Messaging Service) receiving terminal; Information bank is set up, to judge transformer fault grade and type according to transformer thermograph; When the transformer thermograph in acquisition monitoring region, carry out the monitoring that can collect transformer thermograph in real time, if transformer thermograph cannot be collected, restarting equipment or restart system.
2. the monitoring method of overheat fault of transformer according to claim 1, is characterized in that, described weighted mean gray-scale value and overheating fault threshold values represent with number percent respectively, and the gray-scale value of described overheating fault threshold values is 10%; If weighted mean gray-scale value≤10%, judge not occur overheating fault, if weighted mean gray-scale value > 10%, judge to occur overheating fault.
3. the monitoring method of overheat fault of transformer according to claim 1 and 2, is characterized in that, described overheating fault threshold values is according to the influence factor adjustment comprising load, environment temperature, ambient humidity collected.
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Effective date of registration: 20180712 Address after: 215345 room 103, A04 103, Wan Yuan Road, Dianshan Town, Kunshan, Jiangsu. Patentee after: SUZHOU QIUZHEN INTELLIGENT TECHNOLOGY Co.,Ltd. Address before: 310007 215 and 216 rooms 10, Tianmu Mountain Road 18, Xihu District, Hangzhou, Zhejiang. Patentee before: HANGZHOU WINPOWER TECHNOLOGY Co.,Ltd. |
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