CN114279732B - Method for calculating comprehensive evaluation coefficient of cooling performance of direct-mounted sleeve of transformer - Google Patents
Method for calculating comprehensive evaluation coefficient of cooling performance of direct-mounted sleeve of transformer Download PDFInfo
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- CN114279732B CN114279732B CN202111535250.1A CN202111535250A CN114279732B CN 114279732 B CN114279732 B CN 114279732B CN 202111535250 A CN202111535250 A CN 202111535250A CN 114279732 B CN114279732 B CN 114279732B
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Abstract
The invention discloses a method for calculating a comprehensive evaluation coefficient of cooling performance of a direct-mounted bushing of a transformer, which comprises the following steps of: the method comprises the steps of establishing a comprehensive test platform for the cooling performance of the direct-mounted transformer bushing, obtaining a cooling coefficient of the bushing under a natural convection condition, obtaining a cooling coefficient of the bushing under a crosswind condition, calculating a comprehensive evaluation coefficient for the cooling performance of the direct-mounted transformer bushing, and evaluating the cooling performance of the direct-mounted transformer bushing. The invention has the beneficial effects that: the index for judging the cooling performance of the direct-mounted bushing of the transformer is provided for the first time, the cooling effect of the direct-mounted bushing under natural convection and forced convection can be scientifically and reasonably and comprehensively considered, the scientific evaluation of the cooling performance of the direct-mounted bushing of the power transformer is realized, and the consumption of manpower and material resources is reduced.
Description
Technical Field
The invention relates to the field of electric insulation on-line detection and fault diagnosis, in particular to a method for calculating a comprehensive evaluation coefficient of cooling performance of a direct-mounted bushing of a transformer.
Background
The large power transformer is a core device in a power transmission and transformation system, and the reliability of the large power transformer is the key of safe operation of a power grid. The bushing is one of the important components of the power transformer, and not only plays a role in guiding and supporting the outgoing line of the winding to penetrate out of the transformer box body and be connected to an external power grid, but also plays a role in ensuring the insulation between the outgoing line and the transformer body. During the operation of the transformer, the central conductor of the bushing generates heat under the joule effect of the current, thus causing a different increase in the temperature of the various parts of the bushing. If the sleeve cannot be timely dissipated through the cooling effect of the umbrella skirt on the outer surface, the heat accumulated inside the sleeve can cause local or overall overheating of the sleeve, and further damage to the insulation inside the sleeve is caused. Therefore, the cooling performance is an important technical index of the sleeve, and the accurate evaluation of the cooling performance of the sleeve has great significance for the optimal design and the temperature on-line monitoring of the sleeve. The cooling performance of the sleeve mainly depends on the convection heat transfer characteristic of the umbrella skirt at the outermost side of the porcelain sleeve, but due to the complex structure and the large difference of the umbrella skirt structures among the sleeves of different models, the current research is limited to the cooling performance evaluation of the sleeves of specific models under certain specific conditions, or the cooling performance of the sleeves can be only estimated based on rough empirical parameters, and a universal evaluation method for the cooling performance of the sleeves, which can fully consider the convection heat transfer characteristic of the umbrella skirt pieces of the porcelain sleeve, is lacked.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide a method for calculating the comprehensive evaluation coefficient of the cooling performance of the direct-mounted type sleeve of the transformer, which can realize scientific and reasonable evaluation of the cooling performance of the direct-mounted type sleeve with any structure and any umbrella skirt number.
The technical scheme for realizing the purpose of the invention is as follows:
firstly, establishing a comprehensive test platform for cooling performance of a direct-mounted sleeve of a transformer
The transformer directly adorns formula sleeve pipe cooling performance combined test platform includes: transformer bushing main part (1), bushing umbrella skirt (2), binding post (3) on the bushing guide pole, binding post (4) under the bushing guide pole, bushing flange (5), flange fixing bolt (6), test platform base (7), bushing umbrella skirt windward side temperature sensor array (8), bushing umbrella skirt leeward side temperature sensor array (9), proof box bottom left front side temperature sensor (10), proof box bottom left rear side temperature sensor (11), proof box bottom right front side temperature sensor (12), proof box bottom right rear side temperature sensor (13), proof box top left front side temperature sensor (14), proof box top left rear side temperature sensor (15), proof box top right front side temperature sensor (16), proof box top right rear side temperature sensor (17), fan (18), constant temperature case box (19), The device comprises a direct current resistance tester (20), an adjustable alternating current power supply (21), an optical fiber temperature measurement host (22) and an upper computer (23);
the sleeve umbrella skirt (2) consists of a plurality of annular umbrella skirt pieces with alternate sizes, the annular umbrella skirt pieces are uniformly sleeved on the outer side of the transformer sleeve main body (1) from top to bottom to form the whole sleeve umbrella skirt (2), the number of the umbrella skirt pieces is recorded as N, the umbrella skirt pieces are numbered as N, the umbrella skirt piece at the lowest side in the vertical direction is numbered as 1, namely N is 1; the number of the umbrella skirt piece at the uppermost side is N, namely N is N; the bushing flange (5) is arranged at the bottom of the transformer bushing main body (1), and the bushing flange (5) is fixed with the test platform base (7) through a flange fixing bolt (6); the wiring terminal (3) on the bushing guide rod is positioned at the top of the transformer bushing main body (1) and is positioned in the center of the bushing main body (1) in the horizontal direction; the lower wiring terminal (4) of the sleeve guide rod is positioned at the bottom of the sleeve flange (5) and is positioned in the center of the sleeve main body (1) in the horizontal direction; the fan (18) is arranged on the left wall surface of the box body (19) of the constant temperature test box, so that the left side of the sleeve umbrella skirt (2) is a windward side, and the right side of the sleeve umbrella skirt is a leeward side; the windward side surface of each umbrella skirt piece of the sleeve umbrella skirt (2) is provided with an optical fiber temperature sensor, all the sensors on the windward side are connected to form a sleeve umbrella skirt windward side temperature sensor array (8), and the sleeve umbrella skirt windward side temperature sensor array (8) is connected with an optical fiber temperature measurement host (22); the leeward side surface of each umbrella skirt piece of the sleeve umbrella skirt (2) is provided with an optical fiber temperature sensor, all the sensors on the leeward side are connected to form a sleeve umbrella skirt leeward side temperature sensor array (9), and the sleeve umbrella skirt leeward side temperature sensor array (9) is connected with an optical fiber temperature measurement host (22); the structures are all placed in the center of a constant temperature test box body (19);
the left front side temperature sensor (10) of the bottom layer of the test box is arranged on the left front side of the bottom layer in the box body (19) of the constant temperature test box, the left rear side temperature sensor (11) of the bottom layer of the test box is arranged on the left rear side of the bottom layer in the box body (19) of the constant temperature test box, the right front side temperature sensor (12) of the bottom layer of the test box is arranged on the right front side of the bottom layer in the box body (19) of the constant temperature test box, and the right rear side temperature sensor (13) of the bottom layer of the test box is arranged on the right rear side of the bottom layer in the box body (19) of the constant temperature test box; the left front side temperature sensor (14) of the top layer of the test box is installed on the left front side of the top layer in the box body (19) of the constant temperature test box, the left rear side temperature sensor (15) of the top layer of the test box is installed on the left rear side of the top layer in the box body (19) of the constant temperature test box, the right front side temperature sensor (16) of the top layer of the test box is installed on the right front side of the top layer in the box body (19) of the constant temperature test box, and the right rear side temperature sensor (17) of the top layer of the test box is installed on the right rear side of the top layer in the box body (19) of the constant temperature test box;
an I + port of the direct current resistance tester (20) is connected with the upper wiring terminal (3) of the sleeve guide rod, and an I-port of the direct current resistance tester (20) is connected with the lower wiring terminal (4) of the sleeve guide rod; an L port of an adjustable alternating current power supply (21) is connected with the upper wiring terminal (3) of the sleeve guide rod, an N port of the adjustable alternating current power supply (21) is connected with the lower wiring terminal (4) of the sleeve guide rod, and a GND port of the adjustable alternating current power supply (21) is connected with the flange fixing bolt (6); the direct current resistance tester (20), the adjustable alternating current power supply (21) and the optical fiber temperature measurement host (22) are connected with the upper computer (23);
step two, obtaining the cooling coefficient C of the sleeve under the natural convection condition N
Setting the current output effective value of the adjustable alternating current power supply (21) as the rated current of the bushing, and starting the adjustable alternating current power supply (21) to enable the bushing main body (1) to heat under the action of the rated current; n temperature data obtained by a sleeve umbrella skirt windward side temperature sensor array (8) are obtained and are numbered as T from bottom to top NY1 ～T NYn ，n∈[1,N]Wherein the maximum temperature is denoted as T NYmax (ii) a N temperature data obtained by a sleeve umbrella skirt leeward side temperature sensor array (9) are obtained and are numbered as T from bottom to top NB1 ～T NBn Wherein the maximum temperature is denoted as T NBmax (ii) a When T is NYmax Or T NBmax When the first fluctuation is less than 0.5 ℃ after the self-adjustable alternating current power supply (21) is started, recording the T at the moment NY1 ～T NYn And T NB1 ～T NBn Value, while disconnecting the adjustable ac power supply (21), the direct current resistance R of the guide bar is measured immediately using the direct current resistance tester (20) D And recording; according to the formula (1), the cooling coefficient C of the sleeve under the natural convection condition is calculated N ；
Thirdly, obtaining the cooling coefficient C of the sleeve under the condition of crosswind F
Setting the wind speed of a fan (18), and starting the fan (18) to enable a constant temperature test box body (19) to generate parallel cooling airflow in the left-to-right direction; setting the current output effective value of the adjustable alternating current power supply (21) as the rated current of the bushing, and starting the adjustable alternating current power supply (21) to enable the bushing main body (1) to heat under the action of the rated current; n temperature data obtained by a sleeve umbrella skirt windward side temperature sensor array (8) are obtained and are numbered as T from bottom to top FY1 ～T FYn ，n∈[1,N]Wherein the maximum temperature is denoted as T FYmax (ii) a N temperature data obtained by a sleeve umbrella skirt leeward side temperature sensor array (9) are obtained and are numbered as T from bottom to top FB1 ～T FBn Which isThe maximum value of the medium temperature is recorded as T FBmax (ii) a When T is FYmax Or T FBmax When the first fluctuation is less than 0.5 ℃ after the self-adjustable alternating current power supply (21) is started, the T at the moment is recorded FY1 ～T FYn And T FB1 ～T FBn Value, and obtaining the left front side temperature T of the bottom layer of the test box at the moment 1 Left rear side temperature T of bottom layer of test box 2 Temperature T of right front side of bottom layer of test box 3 Temperature T of right rear side of bottom layer of test box 4 Temperature T of left front side of top layer of test box 5 Left rear side temperature T of top layer of test box 6 Temperature T of right front side of top layer of test box 7 And the right rear side temperature T of the top layer of the test box 8 After all data are recorded, the adjustable alternating current power supply (21) is disconnected, and simultaneously, the direct current resistance R of the guide rod is measured by using the direct current resistance tester (20) immediately D And recording; measuring the vertical distance between the nth umbrella skirt and the upper surface of the sleeve flange (5) and recording as h n From this can be obtained (h) 1 ,T FY1 )、(h 2 ,T FY2 )、…、(h n ,T FYn ) N sets of data, and (h) 1 ,T FB1 )、(h 2 ,T FB2 )、…、(h n ,T FBn ) N groups of data;
respectively fitting the N groups (h) by taking the vertical distance h from the upper surface of the sleeve flange (5) as an independent variable n ,T FYn ) And group N (h) n ,T FBn ) Data, get T FY ＝f 1 (h)、T FB ＝f 2 (h) The functional relation of (c); t is a unit of FY And T FB Are respectively according to (h) n ,T FYn ) And (h) n ,T FBn ) Fitting the data to obtain a dependent variable of the function; according to the formula (2), the cooling coefficient C of the sleeve under the crosswind condition is calculated F ；
Fourthly, calculating the comprehensive evaluation coefficient C of the cooling performance of the direct-mounted sleeve of the transformer S
Fifthly, evaluating the cooling performance of the direct-mounted sleeve of the transformer
If C S >1, the cooling performance of the transformer direct-mounted bushing is better; if 0.4<C S The cooling performance of the direct-mounted bushing of the transformer is general when the cooling performance is less than or equal to 1; if C S Less than or equal to 0.4, the cooling performance of the direct-mounted sleeve of the transformer is poor, and the use requirement cannot be met.
The method for calculating the comprehensive evaluation coefficient of the cooling performance of the direct-mounted bushing of the transformer has the advantages that:
1) the invention provides an index for evaluating the cooling performance of the direct-mounted bushing of the transformer for the first time, and can scientifically and reasonably comprehensively consider the cooling effect of the direct-mounted bushing under natural convection and forced convection to realize scientific evaluation of the cooling performance of the direct-mounted bushing of the power transformer;
2) the invention provides a more efficient and accurate new method for cooling design and temperature on-line monitoring of the sleeve, and can reduce consumption of manpower and material resources.
Drawings
Fig. 1 is a schematic structural diagram of a comprehensive test platform for cooling performance of a direct-mounted bushing of a transformer according to the invention.
Detailed Description
The invention is further described with reference to the accompanying drawings and the specific implementation procedures. It should be emphasized that the embodiments described herein are merely illustrative and do not limit the scope of the inventive concept and its claims.
Firstly, establishing a comprehensive test platform for cooling performance of a direct-mounted sleeve of a transformer
The transformer direct-mounted bushing cooling performance comprehensive test platform comprises: transformer bushing main body (1), bushing umbrella skirt (2), binding post (3) on the bushing guide pole, binding post (4) under the bushing guide pole, bushing flange (5), flange fixing bolt (6), test platform base (7), bushing umbrella skirt windward side temperature sensor array (8), bushing umbrella skirt leeward side temperature sensor array (9), proof box bottom left front side temperature sensor (10), proof box bottom left rear side temperature sensor (11), proof box bottom right front side temperature sensor (12), proof box bottom right rear side temperature sensor (13), proof box top left front side temperature sensor (14), proof box top left rear side temperature sensor (15), proof box top right front side temperature sensor (16), proof box top right rear side temperature sensor (17), fan (18), constant temperature box body (19), The device comprises a direct current resistance tester (20), an adjustable alternating current power supply (21), an optical fiber temperature measurement host (22) and an upper computer (23);
the sleeve umbrella skirt (2) consists of a plurality of annular umbrella skirt pieces with alternate sizes, the annular umbrella skirt pieces are uniformly sleeved on the outer side of the transformer sleeve main body (1) at intervals from top to bottom to form the whole sleeve umbrella skirt (2), and the number N of the umbrella skirt pieces is 20; the number of the umbrella skirt piece is n, the number of the umbrella skirt piece at the lowest side in the vertical direction is 1, namely n is 1; the number of the skirt piece on the uppermost side is 20, namely n is 20; the sleeve flange (5) is arranged at the bottom of the transformer sleeve main body (1), and the sleeve flange (5) is fixed with the test platform base (7) through a flange fixing bolt (6); the wiring terminal (3) on the bushing guide rod is positioned at the top of the transformer bushing main body (1) and is positioned in the center of the bushing main body (1) in the horizontal direction; the lower wiring terminal (4) of the sleeve guide rod is positioned at the bottom of the sleeve flange (5) and is positioned in the center of the sleeve main body (1) in the horizontal direction; the fan (18) is arranged on the left wall surface of the box body (19) of the constant temperature test box, so that the left side of the sleeve umbrella skirt (2) is a windward side, and the right side of the sleeve umbrella skirt is a leeward side; the windward side surface of each shed sheet of the sleeve shed (2) is provided with an optical fiber temperature sensor, all sensors on the windward side are connected to form a sleeve shed windward side temperature sensor array (8), and the sleeve shed windward side temperature sensor array (8) is connected with an optical fiber temperature measurement host (22); the leeward side surface of each umbrella skirt piece of the sleeve umbrella skirt (2) is provided with an optical fiber temperature sensor, all the sensors on the leeward side are connected to form a sleeve umbrella skirt leeward side temperature sensor array (9), and the sleeve umbrella skirt leeward side temperature sensor array (9) is connected with an optical fiber temperature measurement host (22); the structures are all placed in the center of a constant temperature test box body (19);
the left front side temperature sensor (10) of the bottom layer of the test box is arranged on the left front side of the bottom layer in the box body (19) of the constant temperature test box, the left rear side temperature sensor (11) of the bottom layer of the test box is arranged on the left rear side of the bottom layer in the box body (19) of the constant temperature test box, the right front side temperature sensor (12) of the bottom layer of the test box is arranged on the right front side of the bottom layer in the box body (19) of the constant temperature test box, and the right rear side temperature sensor (13) of the bottom layer of the test box is arranged on the right rear side of the bottom layer in the box body (19) of the constant temperature test box; the left front side temperature sensor (14) of the top layer of the test box is arranged on the left front side of the top layer in the box body (19) of the constant temperature test box, the left rear side temperature sensor (15) of the top layer of the test box is arranged on the left rear side of the top layer in the box body (19) of the constant temperature test box, the right front side temperature sensor (16) of the top layer of the test box is arranged on the right front side of the top layer in the box body (19) of the constant temperature test box, and the right rear side temperature sensor (17) of the top layer of the test box is arranged on the right rear side of the top layer in the box body (19) of the constant temperature test box;
an I + port of the direct current resistance tester (20) is connected with the upper wiring terminal (3) of the sleeve guide rod, and an I-port of the direct current resistance tester (20) is connected with the lower wiring terminal (4) of the sleeve guide rod; an L port of the adjustable alternating current power supply (21) is connected with the upper wiring terminal (3) of the sleeve guide rod, an N port of the adjustable alternating current power supply (21) is connected with the lower wiring terminal (4) of the sleeve guide rod, and a GND port of the adjustable alternating current power supply (21) is connected with the flange fixing bolt (6); the direct current resistance tester (20), the adjustable alternating current power supply (21) and the optical fiber temperature measurement host (22) are connected with the upper computer (23);
step two, obtaining the cooling coefficient C of the sleeve under the natural convection condition N
Setting the current output effective value of the adjustable alternating current power supply (21) as the rated current 1000A of the sleeve, and starting the adjustable alternating current power supply (21) to enable the sleeve main body (1) to heat under the action of the rated current; obtaining 20 temperature data obtained by a sleeve umbrella skirt windward side temperature sensor array (8), and recording the data as T from bottom to top NY1 、T NY2 、…、T NY20 In ° c, hereinafter, the temperature value of the maximum temperature is denoted as T NYmax (ii) a Obtaining 20 temperature data obtained by a sleeve umbrella skirt leeward side temperature sensor array (9), and recording the data as T from bottom to top NB1 、T NB2 、…、T NB20 Wherein the value of the maximum temperature is denoted as T NBmax (ii) a When T is NYmax Or T NBmax When the first fluctuation is less than 0.5 ℃ after the self-adjustable alternating current power supply (21) is started, the T at the moment is recorded NY1 ～T NY20 And T NB1 ～T NB20 Value, the direct current resistance R of the guide rod is measured immediately by the direct current resistance tester (20) while the adjustable alternating current power supply (21) is disconnected D And record in units of Ω; according to the formula (1), calculating the cooling coefficient C of the sleeve under the natural convection condition N ；
Thirdly, obtaining the cooling coefficient C of the sleeve under the crosswind condition F
Setting the wind speed of a fan (18), and starting the fan (18) to enable a constant-temperature test box body (19) to generate parallel cooling airflow in the direction from left to right; setting the current output effective value of the adjustable alternating current power supply (21) as the rated current of the bushing, and starting the adjustable alternating current power supply (21) to enable the bushing main body (1) to heat under the action of the rated current; obtaining 20 temperature data obtained by a sleeve umbrella skirt windward side temperature sensor array (8), wherein the 20 temperature data are numbered as T from bottom to top FY1 、T FY2 、…、T FY20 Wherein the value of the maximum temperature is denoted as T FYmax (ii) a Obtaining 20 temperature data obtained by a temperature sensor array (9) at the leeward side of the sleeve umbrella skirt, wherein the 20 temperature data are numbered as T from bottom to top FB1 、T FB2 、…、T FB20 Wherein the value of the maximum temperature is denoted as T FBmax (ii) a When T is FYmax Or T FBmax When the first fluctuation is less than 0.5 ℃ after the self-adjustable alternating current power supply (21) is started, recording the T at the moment FY1 ～T FYn And T FB1 ～T FBn Value, and obtaining the left front side temperature T of the bottom layer of the test box at the moment 1 Temperature T of left rear side of bottom layer of test box 2 Temperature T of right front side of bottom layer of test box 3 Temperature T of right rear side of bottom layer of test box 4 Temperature T of left front side of top layer of test box 5 Left rear side temperature T of top layer of test box 6 Temperature T of right front side of top layer of test box 7 And the right rear side temperature T of the top layer of the test box 8 Disconnection after all data recordingAn adjustable AC power supply (21) is used, and a DC resistance tester (20) is used to measure the DC resistance R of the guide rod immediately D And recording; measuring the vertical distance between the nth umbrella skirt and the upper surface of the sleeve flange (5) and recording as h n In the unit m, from which (h) is obtained 1 ,T FY1 )、(h 2 ,T FY2 )、…、(h 20 ,T FY20 ) 20 sets of data in total, and (h) 1 ,T FB1 )、(h 2 ,T FB2 )、…、(h 20 ,T FB20 ) 20 groups of data;
respectively fitting the 20 groups (h) by taking the vertical distance h from the upper surface of the sleeve flange (5) as an independent variable n ,T FYn ) And 20 groups (h) n ,T FBn ) Data, get T FY ＝f 1 (h)、T FB ＝f 2 (h) The functional relations of (a) are respectively:
T FY ＝f 1 (h)＝-63.13131h 3 +97.72727h 2 -24.29293h+26.93333
T FB ＝f 2 (h)＝-93.04584h 3 +121.32867h 2 -12.2397h+39.96667
T FY and T FB Are respectively according to (h) n ,T FYn ) And (h) n ,T FBn ) Fitting the data to obtain a dependent variable of the function; according to the formula (2), the cooling coefficient C of the sleeve under the crosswind condition is calculated F ；
Fourthly, calculating the comprehensive evaluation coefficient C of the cooling performance of the direct-mounted sleeve of the transformer S
Fifthly, evaluating the cooling performance of the direct-mounted sleeve of the transformer
If C S >1, the cooling performance of the transformer direct-mounted bushing is better; if 0.4<C S The cooling performance of the transformer direct-mounted bushing is general if the cooling performance is less than or equal to 1; if C S Less than or equal to 0.4, the cooling performance of the direct-mounted sleeve of the transformer is poor, and the use requirement cannot be met.
Claims (1)
1. A method for calculating the comprehensive evaluation coefficient of the cooling performance of a direct-mounted bushing of a transformer is characterized by comprising the following steps of:
firstly, establishing a comprehensive test platform for cooling performance of a direct-mounted sleeve of a transformer
The transformer directly adorns formula sleeve pipe cooling performance combined test platform includes: transformer bushing main part (1), bushing umbrella skirt (2), binding post (3) on the bushing guide pole, binding post (4) under the bushing guide pole, bushing flange (5), flange fixing bolt (6), test platform base (7), bushing umbrella skirt windward side temperature sensor array (8), bushing umbrella skirt leeward side temperature sensor array (9), proof box bottom left front side temperature sensor (10), proof box bottom left rear side temperature sensor (11), proof box bottom right front side temperature sensor (12), proof box bottom right rear side temperature sensor (13), proof box top left front side temperature sensor (14), proof box top left rear side temperature sensor (15), proof box top right front side temperature sensor (16), proof box top right rear side temperature sensor (17), fan (18), constant temperature case box (19), The device comprises a direct current resistance tester (20), an adjustable alternating current power supply (21), an optical fiber temperature measurement host (22) and an upper computer (23);
the sleeve umbrella skirt (2) consists of a plurality of annular umbrella skirt pieces with alternate sizes, the umbrella skirt pieces are uniformly sleeved on the outer side of the transformer sleeve main body (1) from top to bottom to form the whole sleeve umbrella skirt (2), the number of the umbrella skirt pieces is marked as N, the umbrella skirt pieces are numbered as N, the umbrella skirt piece at the lowest side in the vertical direction is numbered as 1, and N is 1; the skirt piece on the uppermost side is numbered as N, namely N is N; the sleeve flange (5) is arranged at the bottom of the transformer sleeve main body (1), and the sleeve flange (5) is fixed with the test platform base (7) through a flange fixing bolt (6); the wiring terminal (3) on the bushing guide rod is positioned at the top of the transformer bushing main body (1) and is positioned in the center of the bushing main body (1) in the horizontal direction; the lower wiring terminal (4) of the sleeve guide rod is positioned at the bottom of the sleeve flange (5) and is positioned in the center of the sleeve main body (1) in the horizontal direction; the fan (18) is arranged on the left wall surface of the box body (19) of the constant temperature test box, so that the left side of the sleeve umbrella skirt (2) is a windward side, and the right side of the sleeve umbrella skirt is a leeward side; the windward side surface of each shed sheet of the sleeve shed (2) is provided with an optical fiber temperature sensor, all the sensors on the windward side are connected to form a sleeve shed windward side temperature sensor array (8), and the sleeve shed windward side temperature sensor array (8) is connected with an optical fiber temperature measurement host (22); the leeward side surface of each umbrella skirt piece of the sleeve umbrella skirt (2) is provided with an optical fiber temperature sensor, all the sensors on the leeward side are connected to form a sleeve umbrella skirt leeward side temperature sensor array (9), and the sleeve umbrella skirt leeward side temperature sensor array (9) is connected with an optical fiber temperature measurement host (22); the structures are all placed in the center of a constant temperature test box body (19);
the left front side temperature sensor (10) of the bottom layer of the test box is arranged on the left front side of the bottom layer in the box body (19) of the constant temperature test box, the left rear side temperature sensor (11) of the bottom layer of the test box is arranged on the left rear side of the bottom layer in the box body (19) of the constant temperature test box, the right front side temperature sensor (12) of the bottom layer of the test box is arranged on the right front side of the bottom layer in the box body (19) of the constant temperature test box, and the right rear side temperature sensor (13) of the bottom layer of the test box is arranged on the right rear side of the bottom layer in the box body (19) of the constant temperature test box; the left front side temperature sensor (14) of the top layer of the test box is arranged on the left front side of the top layer in the box body (19) of the constant temperature test box, the left rear side temperature sensor (15) of the top layer of the test box is arranged on the left rear side of the top layer in the box body (19) of the constant temperature test box, the right front side temperature sensor (16) of the top layer of the test box is arranged on the right front side of the top layer in the box body (19) of the constant temperature test box, and the right rear side temperature sensor (17) of the top layer of the test box is arranged on the right rear side of the top layer in the box body (19) of the constant temperature test box;
an I + port of the direct current resistance tester (20) is connected with the upper wiring terminal (3) of the sleeve guide rod, and an I-port of the direct current resistance tester (20) is connected with the lower wiring terminal (4) of the sleeve guide rod; an L port of an adjustable alternating current power supply (21) is connected with the upper wiring terminal (3) of the sleeve guide rod, an N port of the adjustable alternating current power supply (21) is connected with the lower wiring terminal (4) of the sleeve guide rod, and a GND port of the adjustable alternating current power supply (21) is connected with the flange fixing bolt (6); the direct current resistance tester (20), the adjustable alternating current power supply (21) and the optical fiber temperature measurement host (22) are connected with the upper computer (23);
secondly, obtaining the cooling coefficient C of the sleeve under the natural convection condition N
Setting the effective current output value of the adjustable alternating current power supply (21) as the rated current of the bushing, and starting the adjustable alternating current power supply (21) to enable the bushing main body (1) to generate heat under the action of the rated current; n temperature data obtained by a sleeve umbrella skirt windward side temperature sensor array (8) are obtained and are numbered as T from bottom to top NY1 ～T NYn ，n∈[1,N]Wherein the maximum temperature is denoted as T NYmax (ii) a N temperature data obtained by a sleeve umbrella skirt leeward side temperature sensor array (9) are obtained and are numbered as T from bottom to top NB1 ～T NBn Wherein the maximum temperature is denoted as T NBmax (ii) a When T is NYmax Or T NBmax When the first fluctuation is less than 0.5 ℃ after the self-adjustable alternating current power supply (21) is started, the T at the moment is recorded NY1 ～T NYn And T NB1 ～T NBn Value, while disconnecting the adjustable ac power supply (21), the direct current resistance R of the guide bar is measured immediately using the direct current resistance tester (20) D And record in units of Ω; the measured temperature value unit is; according to the formula (1), calculating the cooling coefficient C of the sleeve under the natural convection condition N ；
Thirdly, obtaining the cooling coefficient C of the sleeve under the crosswind condition F
Setting the wind speed of a fan (18), and starting the fan (18) to enable a constant-temperature test box body (19) to generate parallel cooling airflow in the direction from left to right; setting the current output effective value of the adjustable alternating current power supply (21) as the rated current of the bushing, and starting the adjustable alternating current power supply (21) to enable the bushing main body (1) to heat under the action of the rated current; n temperature data obtained by a sleeve umbrella skirt windward side temperature sensor array (8) are obtained and are numbered as T from bottom to top FY1 ～T FYn ，n∈[1,N]Wherein the maximum temperature is denoted as T FYmax (ii) a N temperatures obtained by a sleeve umbrella skirt leeward side temperature sensor array (9) are obtainedData, numbered from bottom to top as T FB1 ～T FBn Wherein the maximum temperature is denoted as T FBmax (ii) a When T is FYmax Or T FBmax When the first fluctuation is less than 0.5 ℃ after the self-adjustable alternating current power supply (21) is started, the T at the moment is recorded FY1 ～T FYn And T FB1 ～T FBn Value, and obtaining the left front side temperature T of the bottom layer of the test box at the moment 1 Temperature T of left rear side of bottom layer of test box 2 Temperature T of right front side of bottom layer of test box 3 Temperature T of right rear side of bottom layer of test box 4 Temperature T of left front side of top layer of test box 5 Temperature T of left rear side of top layer of test box 6 Temperature T of right front side of top layer of test box 7 And the right rear side temperature T of the top layer of the test box 8 After all data are recorded, the adjustable alternating current power supply (21) is disconnected, and the direct current resistance R of the guide rod is measured immediately by using the direct current resistance tester (20) D And recording; measuring the vertical distance between the nth umbrella skirt and the upper surface of the sleeve flange (5) and recording as h n In the unit of m; thus, can obtain (h) 1 ,T FY1 )、(h 2 ,T FY2 )、…、(h n ,T FYn ) N sets of data, and (h) 1 ,T FB1 )、(h 2 ,T FB2 )、…、(h n ,T FBn ) N groups of data;
respectively fitting the N groups (h) by taking the vertical distance h from the upper surface of the sleeve flange (5) as an independent variable n ,T FYn ) And group N (h) n ,T FBn ) Data, get T FY ＝f 1 (h)、T FB ＝f 2 (h) The functional relation of (1); t is a unit of FY And T FB Are respectively according to (h) n ,T FYn ) And (h) n ,T FBn ) Fitting the data to obtain a dependent variable of the function; according to the formula (2), the cooling coefficient C of the sleeve under the crosswind condition is calculated F ；
Fourthly, calculating the comprehensive evaluation coefficient C of the cooling performance of the direct-mounted sleeve of the transformer S
Fifthly, evaluating the cooling performance of the direct-mounted sleeve of the transformer
If C S >1, the cooling performance of the transformer direct-mounted bushing is better; if 0.4<C S The cooling performance of the direct-mounted bushing of the transformer is general when the cooling performance is less than or equal to 1; if C S Less than or equal to 0.4, the cooling performance of the direct-mounted sleeve of the transformer is poor, and the use requirement cannot be met.
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| JPH08273939A (en) * | 1995-03-30 | 1996-10-18 | Hitachi Ltd | Gas-insulated transformer |
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| CN111160305A (en) * | 2019-12-31 | 2020-05-15 | 武汉工程大学 | Transformer bushing abnormity monitoring method and computer readable medium |
| CN112666209A (en) * | 2020-12-02 | 2021-04-16 | 西南交通大学 | Method for evaluating heat transfer strengthening capability of forced oil circulation guide winding |
| CN113109069A (en) * | 2021-05-14 | 2021-07-13 | 深圳市艾特网能技术有限公司 | Cooling system performance test platform and test method |
| CN113484050A (en) * | 2021-05-26 | 2021-10-08 | 广州市一变电气设备有限公司 | Power transformer cooling performance evaluation system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3767651A1 (en) * | 2019-07-17 | 2021-01-20 | Siemens Aktiengesellschaft | Method for operating a cooling system of a transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08273939A (en) * | 1995-03-30 | 1996-10-18 | Hitachi Ltd | Gas-insulated transformer |
| CN108036870A (en) * | 2017-11-16 | 2018-05-15 | 云南电网有限责任公司电力科学研究院 | A kind of method that casing running temperature security is assessed under loading condition |
| CN111160305A (en) * | 2019-12-31 | 2020-05-15 | 武汉工程大学 | Transformer bushing abnormity monitoring method and computer readable medium |
| CN112666209A (en) * | 2020-12-02 | 2021-04-16 | 西南交通大学 | Method for evaluating heat transfer strengthening capability of forced oil circulation guide winding |
| CN113109069A (en) * | 2021-05-14 | 2021-07-13 | 深圳市艾特网能技术有限公司 | Cooling system performance test platform and test method |
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