CN111948497A - Aging test device and method for transformer insulation paper - Google Patents
Aging test device and method for transformer insulation paper Download PDFInfo
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- CN111948497A CN111948497A CN201910398646.2A CN201910398646A CN111948497A CN 111948497 A CN111948497 A CN 111948497A CN 201910398646 A CN201910398646 A CN 201910398646A CN 111948497 A CN111948497 A CN 111948497A
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- 230000032683 aging Effects 0.000 title claims abstract description 99
- 238000012360 testing method Methods 0.000 title claims abstract description 37
- 238000009413 insulation Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims description 13
- 239000003921 oil Substances 0.000 claims abstract description 117
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000010724 circulating oil Substances 0.000 claims abstract description 21
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 19
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 13
- 238000010998 test method Methods 0.000 claims abstract description 11
- 238000012937 correction Methods 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims description 31
- 238000005070 sampling Methods 0.000 claims description 16
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 4
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims description 3
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 230000017525 heat dissipation Effects 0.000 claims description 3
- 238000004128 high performance liquid chromatography Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 230000002000 scavenging effect Effects 0.000 claims description 2
- 238000009423 ventilation Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 8
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Housings And Mounting Of Transformers (AREA)
- Testing Relating To Insulation (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention relates to the technical field of transformer tests, and particularly discloses an aging test device and a test method for transformer insulation paper, wherein the aging test device comprises the following steps: an aging box; a sample drawer; an aging tank; an insulating paper holder and a wire harness; the aging tank comprises an oil pipe and a valve for filling oil and changing oil, an oil inlet and outlet pipe and a circulating oil pump for circulating insulating oil, and a ventilation pipe and a gas pressure pipe for vacuumizing and filling nitrogen. The invention can simulate the real working environment of the transformer, and realizes that the interval time of replacing the insulating oil, the frequency of replacing the insulating oil and the circulating speed of the insulating oil are set as condition variables to obtain a corresponding furfural-polymerization degree quantitative correction equation, thereby researching the influence of the factors on the aging of the insulating paper.
Description
Technical Field
The invention belongs to the technical field of transformer tests, and particularly relates to an aging test device and an aging test method for transformer insulation paper.
Background
The transformer is an important power device in the operation of a power grid, and as the oil-immersed transformer has the advantages of energy conservation, low noise, high reliability, large capacity and the like, most of the currently operated transformers are oil-immersed transformers, an insulation system of the transformers is composed of insulating oil and insulating paper, and the aging speed of the transformers is a key factor influencing the safety reliability and the service life of the transformers.
During the regular maintenance of the transformer, the replacement of the insulating oil is easier to realize, but the insulating paper cannot be replaced, so the aging degree of the insulating paper directly determines the service life of the transformer, and the research on the aging influence factors of the insulating paper of the transformer is a key subject in the technical field of transformer tests.
At present, the main test equipment and research direction are to test the aging of the insulating paper from the perspective of temperature, electric field and mechanical impact, but in the test process, the aging time when the insulating oil is replaced and the replacement frequency of the insulating oil have great influence on the aging of the insulating paper, but the existing equipment and test method do not relate to the research subject.
Disclosure of Invention
The invention aims to provide an aging test device for transformer insulating paper, which can simulate the real working environment of the transformer insulating paper and can test the aging of the insulating paper by taking the interval time of replacing insulating oil, the frequency of replacing the insulating oil and the circulating speed of the insulating oil as variables.
The invention also aims to provide an aging test method of the transformer insulating paper, which is used for researching the aging influence of the interval time of replacing the insulating oil, the frequency of replacing the insulating oil and the circulation speed of the insulating oil on the insulating paper.
In order to achieve the above object, the present invention provides an aging test apparatus for transformer insulation paper, comprising: the aging box comprises a heating chamber with an opening extending to the outside, a control panel and a first socket positioned below the control panel; the sample drawer is arranged in the heating chamber in a drawing mode, and the front side of the sample drawer is provided with at least four heat dissipation ports; the aging tank comprises a tank body, a top cover and a fastening ring for locking the tank body and the top cover; an oil discharge pipe connected with a first valve, a pump box with a second plug socket, an oil outlet pipe connected with a circulating oil pump and penetrating through the outer wall of the pump box and then connected with one end of a radiator, and an oil inlet pipe penetrating through the outer wall of the pump box and connected with the other end of the radiator are arranged at the lower part of the tank body; the top cover is provided with a pneumatic pipe connected with the second valve, an oil injection pipe connected with the third valve and a ventilation pipe connected with the fourth valve; the pressure gauge is connected to the end part of the air pressure pipe in a threaded manner; the insulating paper frame is arranged in the aging tank and used for fixing an insulating paper sample; and the wire harness is connected between the first socket and the second socket in a plugging manner and is used for supplying power and transmitting signals for the circulating oil pump.
Preferably, in the above technical scheme, the tank further comprises a sealing ring arranged between the tank body and the top cover, and the sealing ring is made of a rubber material.
Preferably, in the above technical scheme, the insulating paper holder is made of a copper material.
Preferably, in the above technical scheme, at least four circular grooves for placing the aging tank are arranged on the inner bottom surface of the sample drawer.
Preferably, in the above technical scheme, an oil observation window is formed in the side surface of the tank body.
Preferably, in the above technical scheme, two symmetrically arranged carrying handles are arranged on the tank body.
The invention also provides an aging test method of the transformer insulation paper, which comprises the following test steps:
step a: carrying out drying pretreatment on the insulating paper and the insulating oil;
step b: determining the liquid level height of the insulating oil to be added into each aging tank according to the mass ratio of the insulating paper to the insulating oil in each aging tank;
step c: putting insulating paper into the insulating paper frame in the aging tank layer by layer, and sealing and covering; injecting insulating oil into each aging tank according to the liquid level of the insulating oil;
step d: vacuumizing each aging tank with the sample, and filling nitrogen into each aging tank;
step e: putting the aging tanks filled with the samples into the aging box for heating, and starting the circulating oil pump for insulating oil circulation;
step f: the method for setting the condition variables of the samples in three sampling times by using the control variable method comprises the following steps: the interval time of replacing the insulating oil, the frequency of replacing the insulating oil and the circulation speed of the insulating oil; then respectively setting sampling time according to the condition variables, and sampling the insulating oil and the insulating paper of the sample when the sample is heated to the sampling time under the constant temperature condition;
step g: and detecting the furfural content of the insulating oil in the sample and the polymerization degree of the insulating paper, establishing linear fitting according to detection data, deriving a constant in a furfural-polymerization degree quantitative equation under the corresponding condition variable, and further deriving a furfural-polymerization degree quantitative correction equation and a correction factor in the equation.
Preferably, in the above technical scheme, the furfural content of the insulating oil is detected by a high performance liquid chromatography, and the polymerization degree of the insulating paper is detected by a viscosity method.
Preferably, in the above technical solution, the mass ratio is 1: 20.
preferably, in the above technical scheme, the air pressure in the tank after the evacuation is-0.1 MPa, and the air pressure in the tank after the nitrogen gas filling is 0.1 MPa.
Compared with the prior art, the invention has the following beneficial effects:
1. the heating and insulating oil circulation functions in the aging test device for the transformer insulating paper can simulate the real working environment of the insulating paper in the transformer.
2. The simultaneous heating of a plurality of ageing jars in the device can make all samples have the same heating environment to the environment of insulating oil in every ageing jar is independent again, does not interfere with, improves the accuracy of controlled variable.
3. The insulating oil circulating systems of the aging tanks in the device are mutually independent, and the circulating flow rate of the insulating oil in each aging tank can be controlled more accurately and independently.
4. The visual operation during evacuation and nitrogen filling can be realized through the manometer, so that the environmental error among samples is reduced.
5. The interval time for replacing the insulating oil, the frequency for replacing the insulating oil and the influence of the circulation speed of the insulating oil on the aging of the insulating paper are researched, and the blank of the test under the condition variable is filled.
Drawings
FIG. 1 is an overall configuration diagram of an aging test apparatus for transformer insulation paper according to the present invention.
FIG. 2 is a structure diagram of a sample drawer of the aging test device for transformer insulation paper according to the present invention.
FIG. 3 is a structural view of a sample tank of an aging test apparatus for transformer insulating paper according to the present invention.
FIG. 4 is a structural view of an insulation paper holder of an aging test apparatus for transformer insulation paper according to the present invention.
FIG. 5 is a schematic view of a control panel of the aging test device for transformer insulation paper of the present invention.
Description of the main reference numerals:
1-aging box, 2-sample drawer, 3-control panel, 4-aging tank, 5-wiring harness, 6-first plug socket, 7-round groove, 8-heat dissipation port, 9-sliding rail, 10-pull handle, 13-tank body, 14-top cover, 15-fastening ring, 16-sealing ring, 17-pump box, 18-circulating oil pump, 19-radiator, 20-oil outlet pipe, 21-oil inlet pipe, 22-second plug socket, 23-insulating paper frame, 24-oil outlet pipe, 25-first valve, 26-air pressure pipe, 27-second valve, 28-oil injection pipe, 29-third valve, 30-air exchange pipe, 31-fourth valve, 32-oil observation window, 33-carrying handle, 34-locking bolt, 35-pressure gauge.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
The first embodiment is as follows:
as shown in fig. 1, 2 and 3, an aging test apparatus for transformer insulation paper includes: the aging box 1, the sample drawer 2, the control panel 3, the aging tank 4, the wiring harness 5, the first socket 6, the circular groove 7, the heat dissipation port 8, the slide rail 9, the pull handle 10, the tank body 13, the top cover 14, the fastening ring 15, the sealing ring 16, the pump box 17, the circulating oil pump 18, the radiator 19, the oil outlet pipe 20, the oil inlet pipe 21, the second socket 22, the insulating paper frame 23, the oil drain pipe 24, the first valve 25, the air pressure pipe 26, the second valve 27, the oil filling pipe 28, the third valve 29, the ventilation pipe 30, the fourth valve 31, the oil observation window 32, the lifting handle 33, the locking bolt 34 and the pressure gauge 35; the aging box 1 is internally provided with a heating chamber with an opening extending to the outside, and a control panel 3 and a first socket 6 are arranged beside the heating chamber; the sample drawer 2 is connected with the inside of the heating chamber through a sliding rail 9 arranged on the side surface of the sample drawer to realize the drawing function, the front side of the sample drawer 2 is provided with a drawing handle 10 made of heat insulating materials and at least four heat radiating ports 8 used for extending a heat radiator 19 out of the heating chamber, and the inner bottom surface of the sample drawer 2 is provided with at least four circular grooves 7 used for placing the aging tank 4; a rubber sealing ring 16 is padded between the tank body 13 and the top cover 14 of the aging tank 4, and the edge of the tank body 13 and the edge of the top cover 14 are buckled by the fastening ring 15 and locked by a locking bolt 34; the upper portion of jar body 13 is equipped with two symmetrical arrangement's carrying handle 33, and the lower part is equipped with and includes: the oil drain pipe 24 is connected with the first valve 25, the pump box 17 is provided with a second socket 22, the oil outlet pipe 20 is connected with the circulating oil pump 18 and penetrates through the outer wall of the pump box 17 and then is connected with one end of the radiator 19, the oil inlet pipe 21 penetrates through the outer wall of the pump box 17 and is connected with the other end of the radiator 19, insulating oil flows out of the tank body 13 during operation, sequentially flows through the oil outlet pipe 20, the oil pump 17 and the radiator 19, finally flows back into the tank body 13 through the oil inlet pipe 21, the insulating oil in the tank body 13 is cooled through the radiator 19 exposed in the air outside the heating chamber, and the circulating oil pump 18 is electrically connected with the second socket 22; an oil liquid observation window 32 for observing the oiling height of the insulating oil is further formed in the side face of the tank body 13; the top cover 14 is provided with a pneumatic pipe 26 connected with the second valve 27, an oil injection pipe 28 connected with the third valve 29 and a scavenging pipe 30 connected with the fourth valve 31, a pressure gauge 35 is connected with the end part of the pneumatic pipe 26 in a threaded manner, and the pressure gauge 35 is a high-temperature-resistant pressure gauge with the working temperature ranging from-40 ℃ to 200 ℃; an insulating paper frame 23 for fixing an insulating paper sample is arranged in the aging tank 4; the wire harness 5 is connected between the first socket 6 and the second socket 22 in a plugging manner and used for supplying power to the circulating oil pump 18 and transmitting a rotating speed signal.
With continued reference to fig. 3, the tank 13 and top 14 are made of stainless steel material and the insulating paper holder 23 is made of copper material, which can simulate copper components in the transformer oil cavity and also act as a catalytic aging process.
As shown in fig. 5, a control panel 3 of the aging test apparatus for transformer insulating paper includes: a power key 36, a confirmation key 48, a heating key 41, a motor work stop key 42, a motor selection key 43, a temperature increase key 44, a temperature decrease key 45, a rotating speed increase key 46, a rotating speed decrease key 47, a temperature setting display screen 37, a temperature real-time display screen 38, a rotating speed display screen 39, a flow rate display screen 40, a motor work indicator lamp 49, a motor selection indicator lamp 50, a heating state indicator lamp 51 and a temperature alarm indicator lamp 52; the control panel 3 is connected with a controller in the aging box, and the controller is respectively connected with a power line, a heating pipe in the heating chamber and a first socket 6;
next, the operation method and the operation principle of the aging test device for transformer insulation paper in the first embodiment will be described in detail to make those skilled in the art understand the present invention more:
1. sample loading operation: a tester places test samples in the insulating paper frame 23 layer by layer, then places the insulating paper frame 23 with the samples in the aging tank 4, fills up the sealing ring 16, covers the top cover 14, sleeves the fastening ring 15 and fastens the fastening bolt 34;
2. oil injection operation: closing the first valve 25, opening the third valve 29, filling oil into the aging tank 4 from the oil filling pipe 28, observing an oil observation window, stopping filling oil and closing the third valve 29 when the liquid level reaches a set height;
3. vacuumizing and filling nitrogen: confirming that the first valve 25, the third valve 29 are closed, and opening the second valve 27 and the fourth valve 31; connecting a vacuum pump and the ventilation pipe 30 by a rubber pipe, opening the vacuum pump to pump air, observing the air pressure value in the pressure gauge 35, closing the vacuum pump when the air pressure value is-0.1 MPa, closing the fourth valve 31, and taking down the vacuum pump; filling nitrogen, connecting the air port of a high-purity nitrogen cylinder with the rubber pipe, opening a fourth valve 31, opening the valve of the nitrogen cylinder, observing the air pressure value in a pressure gauge 35, closing the valve of the nitrogen cylinder when the air pressure value is 0.1MPa, closing the fourth valve 31, detaching the rubber pipe and the nitrogen cylinder from the ventilation pipe 30, and then closing the second valve 27;
4. aging and heating operation: placing the aging tank filled with the sample, filled with oil and filled with nitrogen gas into the circular groove 7 of the sample drawer 2, extending the radiator 19 out of the heat-radiating opening 8, making the front surface of the pump box 17 flush with the front surface of the sample drawer 2, and exposing the second socket 22 outside the sample drawer 2; after a plurality of aging tanks are placed, the sample drawer 2 is pushed into the aging box 1, the first socket 6 and all the second sockets 22 are connected by a wire harness 5, and the heating operation of the equipment is performed on the control panel 3;
5. description of control panel operation: a power key 36 for switching the entire test apparatus on and off; when heating operation is carried out, a temperature value required to be heated is set through the temperature increasing key 44 and the temperature decreasing key 45, the value is displayed through the temperature setting display screen 37, the value is stored by pressing the confirming key 48 after the value is set, then the heating key 41 is pressed to start heating, the heating state indicator lamp 51 is lightened at the moment, and the real-time temperature in the heating chamber in the heating process is displayed through the temperature real-time display screen 38; when the heating temperature exceeds the set temperature, the temperature alarm indicator lamp 52 can alarm and flash; when the insulating oil circulation operation is carried out, the circulating oil pump 18 which needs to be arranged is selected through the motor selection key 43, the corresponding number of the selected circulating oil pump 18 is displayed in the motor selection indicator lamp 50, after the corresponding circulating oil pump 18 is selected, the rotating speed of the selected circulating oil pump 18 is set through the rotating speed increasing key 46 and the rotating speed reducing key 47, the numerical value of the rotating speed is displayed through the rotating speed display screen 39, the circulating flow speed of the insulating oil in the corresponding aging tank 4 is displayed through the flow speed display screen 40, the numerical value is stored by pressing the confirming key 48 after the rotating speed is set, the circulating oil pump 18 is started or stopped through the motor work stop key 42, the working state of the corresponding circulating oil pump 18 can be observed through the motor work indicator lamp 49, the indicator lamp is lightened to represent the work of the oil pump, and the indicator lamp represents the stop work of the;
6. sampling operation: the heating function and the oil circulation function are closed, when the temperature in the temperature real-time display screen 38 is close to the room temperature, the equipment is closed, the wiring harness 5 is detached from the plug, the sample drawer 2 is opened, and the aging tank 4 is taken out; slowly opening the fourth valve 31 to discharge the gas in the tank until the reading in the pressure gauge 35 is zero; opening a first valve 25, discharging the insulating oil from the oil discharge pipe 24, and sampling; opening the top cover 14, taking the insulating paper frame 23 out of the tank body 13, taking the filter paper out of the insulating paper frame 23, and sampling;
example two:
an aging test method for transformer insulation paper comprises the following specific operation steps:
step a: carrying out drying pretreatment on the insulating paper and the insulating oil under the condition of vacuum drying for 48 hours;
step b: firstly, setting the mass ratio of insulating paper to insulating oil in each aging tank 4 to be 1:20, and calculating the liquid level height of the insulating oil to be added into each aging tank 4 according to the radius of the tank body 13 and the density of the insulating oil;
step c: putting the insulating paper into an insulating paper frame 23 in the aging tank 4 layer by layer, and sealing and covering; injecting insulating oil into each aging tank 4 according to the insulating oil liquid level calculated in the previous step;
step d: vacuumizing each aging tank 4 with the sample, and filling nitrogen into each aging tank 4;
step e: putting the aging tank 4 filled with the samples into an aging box 1, and heating and insulating oil circulation are carried out according to the aging heating operation in the first embodiment;
step f: the method for setting the condition variables of the samples in three sampling times by using the control variable method comprises the following steps: interval time for replacing the insulating oil (hereinafter, referred to as oil change time), number of times for replacing the insulating oil (hereinafter, referred to as oil change number) and circulation speed of the insulating oil (hereinafter, referred to as circulation oil speed); then respectively setting sampling time t according to the condition variables, and sampling the insulating oil and the insulating paper of the sample according to the sampling operation in the first embodiment when the sample is heated to the sampling time t under the constant temperature condition of 130 ℃;
step g: because the degree of polymerization DP of the insulating paper is an important index for judging the aging degree of the insulating paper, the high performance liquid chromatography is adopted to detect the furfural content C of the insulating oil in the sample1Detecting the degree of polymerization DP of the insulating paper by adopting a viscosity method1And then according to the existing quantitative equation of furfural-polymerization degree:
in the formula: a and b are constants, C2-FALIs the furfural content in the oil; DP is the degree of polymerization of the insulating paper;
calculating the theoretical degree of polymerization DP0It was found that the actual degree of polymerization DP was measured in samples of different oil change times, oil change times and circulating oil rates1The theoretical degree of polymerization DP corresponding to the variables of the conditions0There is a difference between them, so it is necessary to establish linear fitting for actually detected multiple groups of data, derive a, b constants in the quantitative furfural-polymerization degree equation corresponding to the condition variables, and further derive a quantitative furfural-polymerization degree correction equation and correction factors in the correction equation under the corresponding condition variables.
In conclusion, the aging test device for the transformer insulation paper simulates the real working environment of the insulation paper in the transformer through the independent circulation functions of heating and insulation oil, and avoids the environmental interference among samples; the oil filling, the vacuum pumping and the nitrogen filling can be carried out in a hanging mode, so that the error of the test environment is further reduced, and the test data are more real and accurate.
According to the aging test method of the transformer insulating paper, the influence conditions of oil change time, oil change times and circulating oil speed are taken as research subjects to obtain a corresponding furfural-polymerization degree quantitative correction equation, so that the influence rule of the oil change time, the oil change times and the circulating oil speed on the service life of the insulating paper is explored.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (10)
1. The utility model provides an aging test device of transformer insulating paper which characterized in that includes:
the aging box (1) comprises a heating chamber with an opening extending outwards, a control panel (3) and a first socket (6) positioned below the control panel (3);
the sample drawer (2) is arranged in the heating chamber in a drawing mode, and at least four heat dissipation ports (8) are formed in the front side of the sample drawer (2);
an aging tank (4) comprising a tank body (13), a top cover (14) and a fastening ring (15) for locking the tank body (13) and the top cover (14); an oil discharge pipe (24) connected with a first valve (25), a pump box (17) with a second plug port (22), an oil outlet pipe (20) connected with a circulating oil pump (18) and penetrating through the outer wall of the pump box (17) to be connected with one end of a radiator (19), and an oil inlet pipe (21) penetrating through the outer wall of the pump box (17) to be connected with the other end of the radiator (19) are arranged at the lower part of the tank body (13); the top cover (14) is provided with an air pressure pipe (26) connected with the second valve (27), an oil filling pipe (28) connected with the third valve (29) and a scavenging pipe (30) connected with the fourth valve (31); a pressure gauge (35) screwed to an end of the pneumatic tube (26);
the insulating paper frame (23) is arranged in the aging tank (4) and used for fixing an insulating paper sample;
and the wire harness (5) is connected between the first plug socket (6) and the second plug socket (22) in a plugging mode, and the wire harness (5) is used for supplying power and transmitting signals for the circulating oil pump (18).
2. The aging test device for transformer insulation paper according to claim 1, further comprising a sealing ring (16) disposed between the tank (13) and the top cover (14), wherein the sealing ring (16) is made of rubber material.
3. The aging test device for transformer insulation paper according to claim 1, wherein the insulation paper holder (23) is made of copper material.
4. The aging test device for transformer insulation paper according to claim 1, characterized in that the inner bottom surface of the sample drawer (2) is provided with at least four circular grooves (7) for placing the aging tank (4).
5. The aging test device for transformer insulation paper according to claim 1, characterized in that the side of the tank (13) is provided with an oil observation window (32).
6. The aging test device for transformer insulation paper according to claim 1, characterized in that two symmetrically arranged carrying handles (33) are arranged on the tank (13).
7. The aging test method of transformer insulation paper according to claim 1, characterized by comprising the following test steps:
step a: carrying out drying pretreatment on the insulating paper and the insulating oil;
step b: according to the mass ratio of the insulating paper to the insulating oil in each aging tank (4), determining the liquid level height of the insulating oil to be added into each aging tank (4);
step c: putting the insulating paper into the insulating paper frame (23) in the aging tank (4) layer by layer, and sealing and covering; injecting insulating oil into each aging tank (4) according to the liquid level height of the insulating oil;
step d: vacuumizing each aging tank (4) with the sample, and filling nitrogen into each aging tank (4);
step e: putting the aging tank (4) filled with all samples into the aging box (1) for heating, and starting the circulating oil pump (18) for insulating oil circulation;
step f: the method for setting the condition variables of the samples in three sampling times by using the control variable method comprises the following steps: the interval time of replacing the insulating oil, the frequency of replacing the insulating oil and the circulation speed of the insulating oil; then respectively setting sampling time according to the condition variables, and sampling the insulating oil and the insulating paper of the sample when the sample is heated to the sampling time under the constant temperature condition;
step g: detecting the furfural content of insulating oil in a sample and the polymerization degree of insulating paper, establishing linear fitting according to detection data, deducing a constant in a furfural-polymerization degree quantitative equation under the corresponding condition variable, and further deducing a corresponding furfural-polymerization degree quantitative correction equation and a correction factor in the equation.
8. The aging test method of transformer insulation paper according to claim 7, wherein the furfural content of the insulation oil is detected by high performance liquid chromatography, and the polymerization degree of the insulation paper is detected by viscosity method.
9. The aging test method of transformer insulation paper according to claim 7, wherein the mass ratio is 1: 20.
10. the aging test method for transformer insulation paper according to claim 7, wherein the pressure in the tank after vacuuming is-0.1 MPa, and the pressure in the tank after nitrogen filling is 0.1 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910398646.2A CN111948497A (en) | 2019-05-14 | 2019-05-14 | Aging test device and method for transformer insulation paper |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910398646.2A CN111948497A (en) | 2019-05-14 | 2019-05-14 | Aging test device and method for transformer insulation paper |
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| CN111948497A true CN111948497A (en) | 2020-11-17 |
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| CN201910398646.2A Pending CN111948497A (en) | 2019-05-14 | 2019-05-14 | Aging test device and method for transformer insulation paper |
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| CN (1) | CN111948497A (en) |
Cited By (2)
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| CN113447227A (en) * | 2021-06-08 | 2021-09-28 | 北京联合大学 | Method for simulating impact load of insulation paper of traction transformer |
| CN113448361A (en) * | 2021-06-08 | 2021-09-28 | 北京联合大学 | Temperature control system for simulating insulation impact load of traction transformer |
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