CN113625138B - Casing defect test device and method - Google Patents
Casing defect test device and method Download PDFInfo
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- CN113625138B CN113625138B CN202110950589.1A CN202110950589A CN113625138B CN 113625138 B CN113625138 B CN 113625138B CN 202110950589 A CN202110950589 A CN 202110950589A CN 113625138 B CN113625138 B CN 113625138B
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- 238000012360 testing method Methods 0.000 title claims abstract description 103
- 230000007547 defect Effects 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title description 8
- 238000009413 insulation Methods 0.000 claims abstract description 47
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- 239000012530 fluid Substances 0.000 claims abstract description 18
- 238000009434 installation Methods 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 239000011888 foil Substances 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000010998 test method Methods 0.000 abstract description 6
- 238000004088 simulation Methods 0.000 abstract description 5
- 238000000605 extraction Methods 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 238000005253 cladding Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
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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
- G01R31/1263—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 of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/92—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating breakdown voltage
-
- 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
- G01R31/16—Construction of testing vessels; Electrodes therefor
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
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- Testing Relating To Insulation (AREA)
Abstract
The application discloses a sleeve defect test device and a sleeve defect test method, wherein the device comprises a test tank, a first wiring mechanism, a second wiring mechanism, a high-voltage electrode, a low-voltage electrode, an oilpaper insulation model and a temperature control mechanism; the test tank comprises a tank body and a tank cover; the high-voltage electrode is movably arranged in the test chamber along the direction close to or far from the high-voltage electrode, and a clamping gap for clamping the oilpaper insulation model is formed between the high-voltage electrode and the high-voltage electrode; a heating chamber is arranged in the high-voltage electrode; a fluid medium is arranged in the heating chamber; the temperature control mechanism is used for adjusting the temperature of the fluid medium in the heating cavity; the first wiring mechanism is arranged on the tank cover and is provided with an abutting part which can be contacted with the high-voltage electrode; the abutting part is provided with an elastic expansion amount; when the abutting part is in contact with the high-voltage electrode, the abutting part applies acting force to the high-voltage electrode along the direction of the high-voltage electrode towards the high-voltage electrode; the second wiring mechanism is connected with the low-voltage electrode. The simulation test of the defects of the oil paper insulating sleeve can be simply, quickly and flexibly realized.
Description
Technical Field
The application relates to the technical field of electric power, in particular to a sleeve defect test device and method.
Background
The oilpaper insulating sleeve is used as a key channel for outgoing lines of transformers and reactors, has the characteristics of high lead current, high voltage and the like, and the safe operation of the oilpaper insulating sleeve is critical to the stability of a power grid system. The bushing is one of the components with the highest defects or faults of the transformer, and researches show that the bushing faults lead to the fact that the unscheduled shutdown of the 220kV and 500kV transformers accounts for about 25% of the total unscheduled shutdown time, and the unscheduled shutdown time accounts for 56.5% of the total unscheduled shutdown time. In order to master the insulation characteristics of the oil paper insulation sleeve, various defects of the sleeve need to be simulated and researched. However, the current sleeve defect simulation test is complex, low in efficiency and poor in operation flexibility.
Disclosure of Invention
In view of the above, the application aims to provide a sleeve defect test device and a sleeve defect test method, which can simply, rapidly and flexibly realize the oil paper insulation sleeve defect simulation test.
In order to achieve the technical aim, the application provides a sleeve defect test device which comprises a test tank, a first wiring mechanism, a second wiring mechanism, a high-voltage electrode, a low-voltage electrode, an oil paper insulation model and a temperature control mechanism, wherein the test tank is connected with the first wiring mechanism;
the test tank comprises a tank body and a tank cover;
The tank cover is detachably covered on the top of the tank body, and a test chamber is formed between the tank cover and the tank body;
The low-voltage electrode is fixedly arranged in the test chamber;
the high-voltage electrode is movably arranged in the test chamber along the direction close to or far from the high-voltage electrode, and a clamping gap for clamping the oilpaper insulation model is formed between the high-voltage electrode and the high-voltage electrode;
A heating chamber is arranged in the high-voltage electrode;
a fluid medium is arranged in the heating cavity;
the temperature control mechanism is used for adjusting the temperature of the fluid medium in the heating cavity so as to adjust the temperature of at least one surface of the high-voltage electrode, which is in contact with the oilpaper insulation model;
the first wiring mechanism is arranged on the tank cover and is provided with an abutting part which can be contacted with the high-voltage electrode;
the abutting part is provided with an elastic expansion amount;
when the abutting part is in contact with the high-voltage electrode, the abutting part applies an acting force to the high-voltage electrode along the direction of the high-voltage electrode towards the low-voltage electrode;
the second wiring mechanism is arranged on the tank body and connected with the low-voltage electrode.
Further, an oil filling valve communicated with the test chamber is connected to the upper end position of one side surface of the tank body, and an oil taking valve communicated with the test chamber is connected to the lower end position of the other side surface of the tank body;
The second wiring mechanism is of a column structure and is arranged at the bottom of the tank body;
the low-voltage electrode is in flexible connection with the second wiring mechanism;
The tank cover is connected with a one-way valve and a pressure gauge.
Further, the first wiring mechanism comprises an insulating sleeve, a guide rod, a push rod and an elastic piece;
The insulation sleeve is coated outside the guide rod and is fixedly connected with the tank cover;
one end of the guide rod extending into the test chamber is provided with an inner concave cavity;
The ejector rod is inserted into the inner concave cavity in a sliding manner, and one end part of the ejector rod, which extends out of the inner concave cavity, forms the abutting part;
the elastic piece is arranged in the inner concave cavity, one end of the elastic piece is connected with the top of the inner concave cavity, and the other end of the elastic piece is connected with the other end of the ejector rod extending into the inner concave cavity.
Further, a sealing cover is arranged at one end of the guide rod extending into the test chamber;
The sealing cover is provided with an avoidance hole for the ejector rod to movably pass through;
a limit screw with adjustable height along the axial direction of the ejector rod is arranged on the rod section of the ejector rod in the inner concave cavity;
the limit screw is contacted and abutted with the inner end surface of the sealing cover.
Further, a first connecting part is vertically arranged at the other end of the ejector rod extending into the inner concave cavity;
The first connecting part is connected with the elastic piece;
The end of the ejector rod extending out of the inner concave cavity is provided with a second connecting part;
a third connecting part which is nested and matched with the second connecting part is arranged on the high-voltage electrode;
The first connecting part is of a cross rod structure, so that the ejector rod is of a T shape;
The second connecting part is of a spherical structure;
the third connecting part is of a columnar structure, and the top of the third connecting part is provided with an arc notch for the second connecting part to be movably embedded.
Further, the elastic piece is a spring.
Further, an insulating fixed cylinder is arranged at the bottom of the test chamber;
The middle part of the fixed cylinder is provided with a mounting through cavity;
the fixed cylinder is provided with a plurality of communication holes which are communicated with the mounting through cavity and the test cavity;
a support bar is arranged on the inner wall of the mounting through cavity near the bottom;
The low-voltage electrode is arranged on the supporting bar;
The high-voltage electrode is movably arranged in the mounting through cavity and is positioned above the high-voltage electrode;
the oilpaper insulation model is installed in the installation through cavity and is located between the high-voltage electrode and the high-voltage electrode.
Further, the oilpaper insulation model is formed by overlapping a plurality of layers of insulation paper and a plurality of layers of aluminum foils in a staggered manner.
Further, the temperature control mechanism comprises a circulating pump and a heater;
The inlet of the circulating pump is communicated with the heating chamber through a first conveying pipe, and the outlet of the circulating pump is communicated with the inlet of the heater through a second conveying pipe;
the outlet of the heater is communicated with the heating chamber through a third conveying pipe.
The application also discloses a sleeve defect test method, which is applied to a sleeve defect test device and comprises the following steps:
preparing an oilpaper insulation model;
Installing the prepared oilpaper insulation model between a high-voltage electrode and a high-voltage electrode, and connecting the high-voltage electrode with a temperature control mechanism;
Mounting the can lid such that the abutment of the first wiring mechanism is in contact with the high voltage motor;
Vacuumizing the test tank;
Injecting insulating oil into the test tank and standing for a preset time;
connecting the high-voltage electrode and the low-voltage electrode to a voltage output end and a current input end of a dielectric loss testing device respectively;
And starting a temperature control mechanism, and starting the dielectric loss testing device to test when the high-voltage electrode is controlled to be stabilized at a preset temperature by the temperature control mechanism.
According to the technical scheme, the sleeve defect test device provided by the application is characterized in that the oilpaper insulation model is used for simulating a capacitor core of a sleeve, and the capacitor core is matched with a high-voltage electrode and a low-voltage electrode to flexibly form the simulated sleeve. And the heating chamber is arranged in the high-voltage electrode, the fluid medium is arranged in the heating chamber, and the temperature of the high-voltage electrode is controlled through the control of the temperature control mechanism, so that the temperature in the actual running sleeve can be simply and quickly simulated. Simultaneously, first wiring mechanism is equipped with can be connected with the high-voltage electrode contact electricity and has the butt portion of elasticity flexible volume for when butt portion with high-voltage electrode contacts, can apply the effort of following the high-voltage electrode orientation to the high-voltage electrode, and then can compact the oilpaper insulation model, and make the electric connection between first wiring mechanism and the high-voltage electrode more firm, improve analogue test's reliability.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of the overall structure of a sleeve defect test device provided by the application;
FIG. 2 is a cross-sectional view of a stationary barrel of a sleeve defect testing apparatus provided in the present application;
FIG. 3 is a schematic diagram of an oilpaper insulation model of a sleeve defect test device provided by the application;
FIG. 4 is a schematic view of a high voltage electrode of a device for testing casing defects according to the present application;
FIG. 5 is a schematic flow chart of a method for testing defects of a casing according to the present application;
In the figure: 1. a test tank; 11. a tank body; 111. an oil filling valve; 112. an oil taking valve; 113. a second wiring mechanism; 12. a can lid; 121. a one-way valve; 122. a pressure gauge; 13. a fastening bolt; 2. a first wiring mechanism; 21. an insulating sleeve; 22. a guide rod; 23. an elastic member; 24. a push rod; 241. a first connection portion; 242. a second connecting portion; 25. sealing cover; 26. a limit screw; 31. a high voltage electrode; 311. a third connecting portion; 312. a notch; 32. a low voltage electrode; 321. soft metal connection; 33. an oilpaper insulation model; 331. insulating paper; 332. aluminum foil; 4. a temperature control mechanism; 41. a circulation pump; 42. a heater; 43. a first delivery tube; 44. a second delivery tube; 45. a third delivery tube; 5. a fixed cylinder; 51. a mounting frame; 52. a support bar; 53. the communication hole.
Detailed Description
The following description of the embodiments of the present application will be made in detail, but not necessarily all embodiments, with reference to the accompanying drawings. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the embodiments of the present application.
In the description of the embodiments of the present application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the embodiments of the present application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In describing embodiments of the present application, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, interchangeably connected, integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediary, or in communication between two elements. The specific meaning of the above terms in embodiments of the present application will be understood in detail by those of ordinary skill in the art.
The embodiment of the application discloses a sleeve defect test device and a sleeve defect test method.
Referring to fig. 1, an embodiment of a sleeve defect testing apparatus according to an embodiment of the present application includes:
the test tank 1, the first wiring mechanism 2, the second wiring mechanism 113, the high-voltage electrode 31, the high-voltage electrode 32, the oilpaper insulation model 33 and the temperature control mechanism 4.
In terms of the structural composition of the test tank 1, the test tank comprises a tank body 11 and a tank cover 12. The tank cover 12 is detachably cover-mounted on the top of the tank 11, and forms a test chamber with the tank 11. The can lid 12 may be connected to the can body 11 by a fastening bolt 13, and a gasket may be provided between the can lid 12 and the can body 11 to improve the connection tightness.
The low-voltage electrode 32 is fixedly installed in the test chamber, and the high-voltage electrode 31 is movably installed in the test chamber along the direction approaching or separating from the low-voltage electrode 32, and a clamping gap for clamping the oilpaper insulation model 33 is formed between the high-voltage electrode and the low-voltage electrode 32. The purpose of the movable installation of the high-voltage electrode 31 is to facilitate the installation of the oiled paper insulation model 33, for example, the oiled paper insulation model 33 is put into the high-voltage electrode 31 after the high-voltage electrode 31 is taken out, and the installation of the oiled paper insulation model 33 can be completed after the high-voltage electrode 31 is returned. The movable mounting manner of the high-voltage electrode 31 can be changed according to actual needs, and is not limited.
In order to simulate the temperature inside the actual running sleeve simply and quickly, a heating chamber is arranged in the high-voltage electrode 31, a fluid medium is arranged in the heating chamber, and the temperature control mechanism 4 is used for adjusting the temperature of at least one surface of the high-voltage electrode 31, which is contacted with the oilpaper insulation model 33, by adjusting the temperature of the fluid medium in the heating chamber.
The first wiring mechanism 2 is attached to the can lid 12 and has an abutting portion that can be brought into contact with the high-voltage electrode 31. The contact portion is provided with an elastic expansion amount, and when the contact portion contacts the high-voltage electrode 31, the contact portion applies a force to the high-voltage electrode 31 in a direction along the high-voltage electrode 31 toward the high-voltage electrode 32.
The second connection mechanism 113 is attached to the tank 11 and connected to the voltage electrode 32.
According to the technical scheme, the sleeve defect test device provided by the application is characterized in that the oilpaper insulation model 33 is used for simulating the capacitance core of the sleeve, and the capacitance core is matched with the high-voltage electrode 31 and the high-voltage electrode 32 to flexibly form the simulated sleeve. In addition, the heating chamber is arranged in the high-voltage electrode 31, the fluid medium is arranged in the heating chamber, and the temperature of the high-voltage electrode 31 is controlled through the control of the temperature control mechanism 4, so that the temperature in the actual operation sleeve can be simulated simply and quickly. Meanwhile, the first wiring mechanism 2 is provided with the abutting part which can be in contact with the high-voltage electrode 31 and has elastic expansion quantity, so that when the abutting part is in contact with the high-voltage electrode 31, acting force along the direction of the high-voltage electrode 31 towards the high-voltage electrode 32 can be applied to the high-voltage electrode 31, the oilpaper insulation model 33 can be compacted, the electric connection between the first wiring mechanism 2 and the high-voltage electrode 31 is firmer, and the reliability of a simulation test is improved.
The foregoing is an embodiment one of a sleeve defect testing device provided in the present embodiment, and the following is an embodiment two of a sleeve defect testing device provided in the present embodiment, and refer to fig. 1 to fig. 4 specifically.
Based on the scheme of the first embodiment:
further, an oil injection valve 111 communicating with the test chamber is connected to the upper end of one side of the tank 11, so that insulating oil can be conveniently injected into the test chamber. The lower end of the other side of the tank 11 is connected with an oil extraction valve 112 communicated with the test chamber, so that the insulating oil in the test chamber can be conveniently discharged after the test is completed, and other mounting positions besides the mounting position are also possible, for example, the oil extraction valve 112 is connected with the tank cover 12, the oil extraction valve 112 is connected with the bottom of the tank 11, and the like, and the invention is not limited in particular.
The second wiring mechanism 113 is a terminal structure, and is mounted at the bottom of the tank 11, so that the second wiring mechanism 113 is flexibly connected with the second wiring mechanism 32 for facilitating the wiring of the voltage electrode 32.
The tank cover 12 is connected with a one-way valve 121 and a pressure gauge 122, wherein the connected one-way valve 121 plays two roles: the one-way valve 121 can be connected with an external vacuum machine, so that the tank 11 can be conveniently vacuumized before oiling; secondly, in the test process, when the temperature and the pressure in the tank 11 rise, the expansion gas and the insulating oil in the tank can be discharged through the one-way valve 121 to play a role in pressure relief. The pressure gauge 122 can be used to indicate the pressure inside the tank 11, facilitating monitoring. The can body 11 and the can cover 12 in the application can be made of metal materials, have better structural strength, and can be made of other materials without limitation.
Further, in terms of the structural composition of the first wiring mechanism 2, it includes an insulating cover 21, a guide rod 22, a jack 24, and an elastic member 23.
Wherein, insulating cover 21 cladding is outside guide arm 22, insulating cover 21 and cover 12 fixed connection. The insulating sleeve 21 mainly performs insulating and sealing functions, and can be embedded and fixed in the middle position of the can cover 12 without limitation.
The guide rod 22 is provided with an inner concave cavity at one end extending into the test chamber, the ejector rod 24 is slidably inserted into the inner concave cavity, and an abutting part is formed at one end of the ejector rod 24 extending out of the inner concave cavity. The elastic piece 23 is installed in the inner concave cavity, one end of the elastic piece 23 is connected with the top of the inner concave cavity, and the other end of the elastic piece is connected with the other end of the ejector rod 24 extending into the inner concave cavity. That is, the elastic member 23 allows the jack 24 to have an elastic expansion and contraction amount, and the abutting portion to have an elastic expansion and contraction amount. The ejector rod 24 can realize limiting along the axial direction of the guide rod 22 through the elastic piece 23, namely, two ends of the elastic piece 23 are respectively fixedly connected, so that the axial limiting connection of the ejector rod 24 can be realized through the elastic piece 23, and the ejector rod 24 is prevented from falling off. In addition, it should be noted that, the guide rod 22 and the ejector rod 24 are both made of conductive materials, and the guide rod 22 and the ejector rod 24 can be electrically conductive and transmitted through the elastic member 23, and the ejector rod 24 can realize conductive and transmitted through sliding contact with the wall of the inner concave cavity, which is not particularly limited, so that the high-voltage electrode 31 can be normally supplied with power through the guide rod 22 and the ejector rod 24.
Further, a sealing cover 25 is arranged at one end of the guide rod 22 extending into the test chamber, the sealing cover 25 is provided with an avoidance hole for the ejector rod 24 to movably pass through, a limit screw 26 with adjustable height along the axial direction of the ejector rod 24 is arranged on the rod section of the ejector rod 24 in the inner concave cavity, and the limit screw 26 is contacted and abutted with the inner end surface of the sealing cover 25. That is, the axial limit of the ejector rod 24 is realized through the cooperation between the limit screw 26 and the sealing cover 25, so as to avoid the ejector rod 24 from falling out. And to realize the adjustment of the limit screw 26, a plurality of screw holes distributed at intervals can be arranged on the ejector rod 24 along the axial direction thereof, so that the height adjustment of the limit screw 26 can be realized by fixing the limit screw 26 in the screw holes at different positions, and the limit screw is not limited in detail. The extension of the push rod 24 can be controlled by adjusting the height of the limit screw 26, so that the simulation test of more sleeve types can be adapted.
Further, a first connecting portion 241 is vertically disposed at the other end of the ejector rod 24 extending into the inner cavity, the first connecting portion 241 is connected with the elastic member 23, a second connecting portion 242 is disposed at one end of the ejector rod 24 extending out of the inner cavity, and a third connecting portion 311 is disposed on the high-voltage electrode 31 and in nesting fit with the second connecting portion 242.
Specifically, the first connecting portion 241 may be a cross bar structure, so that the ejector rod 24 is T-shaped, the second connecting portion 242 may be a spherical structure, the third connecting portion 311 may be a columnar structure, and the top portion is provided with an arc recess 312 into which the second connecting portion 242 is movably embedded. Of course, not limited to the means presented above, the person skilled in the art can make suitable adjustments and changes based on this.
Further, the elastic member 23 is specifically a spring.
Further, the bottom of the test chamber is provided with an insulating fixing cylinder 5, which may be specifically installed at the center position of the bottom in the test chamber, and the bottom of the fixing cylinder 5 is detachably installed and fixed at the bottom of the test chamber through a corresponding mounting bracket 51.
In order to conveniently install the low-voltage electrode 32, the high-voltage electrode 31 and the oilpaper insulation model 33, an installation through cavity is formed in the middle of the fixed cylinder 5, and a plurality of communication holes 53 which are communicated with the installation through cavity and the test cavity are formed in the fixed cylinder 5, so that insulating oil can permeate into the installation through cavity through the communication holes 53.
The support bar 52 is arranged at the position, close to the bottom, of the inner wall of the installation through cavity, the high-voltage electrode 32 is arranged on the support bar 52, the high-voltage electrode 31 is movably arranged in the installation through cavity and is positioned above the low-voltage electrode 32, and the oilpaper insulation model 33 is arranged in the installation through cavity and is positioned between the high-voltage electrode 31 and the low-voltage electrode 32. Taking this installation and fixing structure as an example, the electrode 32 is installed on the supporting strip 52, and the second wiring mechanism 113 at the bottom of the tank 11 can be connected through the metal flexible connection 321, so that the electrical signal of the electrode 32 is led out of the tank 11. After the low-voltage electrode 32 is installed, the oilpaper insulation model 33 and the high-voltage electrode 31 are placed on the low-voltage electrode 32, finally the tank cover 12 is assembled, the high-voltage electrode 31 is supported by the ejector rod 24 with elasticity and expansion, and the clamping of the oilpaper insulation model 33 by the high-voltage electrode 31 and the low-voltage electrode 32 is realized. The electric signal of the high-voltage electrode 31 is introduced into the tank 11 through the guide rod 22 and the push rod 24.
Further, the oilpaper insulation model 33 is formed by overlapping a plurality of layers of insulation paper 331 and a plurality of layers of aluminum foil 332, wherein the thickness of the insulation sub-layer can be adjusted according to practical research needs, and the method is not particularly limited.
Further, the temperature control mechanism 4 includes a circulation pump 41 and a heater 42. The inlet of the circulation pump 41 communicates with the heating chamber through a first delivery pipe 43, the first delivery pipe 43 being specifically connected to the top of the high-voltage electrode 31. The outlet of the circulation pump 41 is communicated with the inlet of the heater 42 through a second conveying pipe 44; the outlet of the heater 42 communicates with the heating chamber through a third duct 45, the third duct 45 also being connected to the top of the high voltage electrode 31 and extending down to the bottom inside the heating chamber. The heating control is as follows, the fluid medium in the heating chamber is pumped out through the circulating pump 41, and then is heated by the heater 42, and the heated fluid medium is sent back to the heating chamber, so that continuous heat exchange of the fluid medium in the heating chamber is realized, and the temperature of the fluid medium in the heating chamber is controlled. The temperature of the fluid medium in the heating chamber can be specifically determined by monitoring the temperature of the fluid medium on the first conveying pipe 43, so as to realize better temperature control, for example, when the temperature of the fluid medium in the first conveying pipe 43 is detected to be the preset temperature for a certain time, it can be determined that the high-voltage electrode 31 reaches the preset temperature, and other temperature control determination modes can be adopted, which is not limited in particular. The heater 42 may be an electric heater 42, the fluid medium may be oil, and the circulation pump 41 may be an oil pump.
As shown in fig. 5, the application also discloses a sleeve defect test method, which is applied to the sleeve defect test device of the above embodiment, and comprises the following steps:
S1, preparing an oilpaper insulation model 33. Specifically, the insulating paper 331 and the aluminum foil 332 having the same diameter as the inner diameter of the fixed cylinder 5 are cut, and the insulating paper 331 may be, for example, 6 layers, each layer being, for example, 5mm thick. The insulating paper 331 and the aluminum foil 332 are put into a constant temperature drying oven for 72 hours or other preset time to be dried.
After the insulating layer is sufficiently dried, one insulating layer is placed in open air, natural wetting is simulated, the weight before and after wetting is recorded by a balance, and then insulating paper 331 and aluminum foil 332 are stacked in a staggered manner to form an oiled paper insulating model 33.
S2, the prepared oilpaper insulation model 33 is installed between the high-voltage electrode 31 and the high-voltage electrode 32, and the high-voltage electrode 31 is connected with the temperature control mechanism 4. Specifically, the oilpaper insulation model 33 is placed on the high-voltage electrode 32 in the fixed cylinder 5, and then the high-voltage electrode 31 is mounted. After the high-voltage electrode 31 is installed, the high-voltage electrode 31 is respectively connected with the temperature control mechanism 4, the temperature control mechanism 4 is connected with the inlet of the heating chamber, namely, the inlet of the circulating pump 41 is communicated with the heating chamber through the first conveying pipe 43, and the outlet of the heater 42 is communicated with the heating chamber through the third conveying pipe 45.
S3, the can lid 12 is mounted so that the abutting portion of the first wiring mechanism 2 is in contact with the high-voltage motor. Specifically, by mounting the can lid 12, the second connection portion 242 of the jack 24 can be brought into contact with the third connection portion 311 of the high-voltage electrode 31.
And S4, vacuumizing the test tank 1. The oil filling valve 111 and the oil taking valve 112 connected to the tank 11 are closed, and the vacuum machine is connected to the check valve 121. The vacuum machine is started to vacuumize the tank 11, and the vacuumization process is stopped when the air pressure drops to a preset air pressure, for example, 1kPa, by observing the pressure gauge 122.
S5, injecting insulating oil into the test tank 1 and standing for a preset time. Specifically, an insulating oil tank is connected to the oil filling valve 111, the oil filling valve 111 is opened, insulating oil is filled into the test tube, and the test tube is left for 2 hours after filling with insulating oil.
S6, the high-voltage electrode 31 and the low-voltage electrode 32 are respectively connected to the voltage output end and the current input end of the dielectric loss testing device. Specifically, one end of the guide rod 22 of the first wiring mechanism 2 extending out of the test chamber is connected to the voltage output terminal of the dielectric loss test device, and the second wiring mechanism 113 is connected to the current input terminal of the dielectric loss test device.
And S7, starting the temperature control mechanism 4, and starting the dielectric loss testing device to test when the high-voltage electrode 31 is controlled to be stabilized at a preset temperature through the temperature control mechanism 4. Specifically, the temperature control mechanism 4 can be started after the wiring is completed, and when the temperature of the high-voltage electrode 31 reaches the preset temperature, the dielectric loss testing device can be started to test the dielectric loss value of the insulating oil paper model at the specific temperature.
According to the test method, the dielectric loss of different insulating layers and different damp degrees at different temperatures can be realized by changing the oil paper insulating model 33 and the temperature manufactured in the step S1, so that more diversified tests are realized.
The foregoing describes a device and method for testing defects of a casing according to the present application, and those skilled in the art will appreciate that the scope of the embodiments of the present application is modified in terms of specific embodiments and application.
Claims (8)
1. The sleeve defect test device is characterized by comprising a test tank, a first wiring mechanism, a second wiring mechanism, a high-voltage electrode, a low-voltage electrode, an oilpaper insulation model and a temperature control mechanism;
the test tank comprises a tank body and a tank cover;
The tank cover is detachably covered on the top of the tank body, and a test chamber is formed between the tank cover and the tank body;
The low-voltage electrode is fixedly arranged in the test chamber;
the high-voltage electrode is movably arranged in the test chamber along the direction close to or far from the high-voltage electrode, and a clamping gap for clamping the oilpaper insulation model is formed between the high-voltage electrode and the high-voltage electrode;
The oil paper insulation model is used for simulating a capacitor core of the sleeve, and the oil paper insulation model is matched with the high-voltage electrode and the high-voltage electrode to flexibly form the simulated sleeve;
A heating chamber is arranged in the high-voltage electrode;
a fluid medium is arranged in the heating cavity;
the temperature control mechanism is used for adjusting the temperature of the fluid medium in the heating cavity so as to adjust the temperature of at least one surface of the high-voltage electrode, which is in contact with the oilpaper insulation model;
the first wiring mechanism is arranged on the tank cover and is provided with an abutting part which can be contacted with the high-voltage electrode;
the abutting part is provided with an elastic expansion amount;
when the abutting part is in contact with the high-voltage electrode, the abutting part applies an acting force to the high-voltage electrode along the direction of the high-voltage electrode towards the low-voltage electrode;
The second wiring mechanism is arranged on the tank body and is connected with the low-voltage electrode;
the first wiring mechanism comprises an insulating sleeve, a guide rod, an ejector rod and an elastic piece;
The insulation sleeve is coated outside the guide rod and is fixedly connected with the tank cover;
one end of the guide rod extending into the test chamber is provided with an inner concave cavity;
The ejector rod is inserted into the inner concave cavity in a sliding manner, and one end part of the ejector rod, which extends out of the inner concave cavity, forms the abutting part;
the elastic piece is arranged in the inner concave cavity, one end of the elastic piece is connected with the top of the inner concave cavity, and the other end of the elastic piece is connected with the other end of the ejector rod extending into the inner concave cavity;
The other end of the ejector rod extending into the inner concave cavity is vertically provided with a first connecting part;
The first connecting part is connected with the elastic piece;
The end of the ejector rod extending out of the inner concave cavity is provided with a second connecting part;
a third connecting part which is nested and matched with the second connecting part is arranged on the high-voltage electrode;
The first connecting part is of a cross rod structure, so that the ejector rod is of a T shape;
The second connecting part is of a spherical structure;
the third connecting part is of a columnar structure, and the top of the third connecting part is provided with an arc notch for the second connecting part to be movably embedded.
2. The sleeve defect testing device according to claim 1, wherein an oil filling valve communicated with the testing chamber is connected to the upper end position of one side surface of the tank body, and an oil taking valve communicated with the testing chamber is connected to the lower end position of the other side surface of the tank body;
The second wiring mechanism is of a column structure and is arranged at the bottom of the tank body;
the low-voltage electrode is in flexible connection with the second wiring mechanism;
The tank cover is connected with a one-way valve and a pressure gauge.
3. The sleeve defect testing device according to claim 1, wherein a sealing cover is arranged at one end of the guide rod extending into the testing chamber;
The sealing cover is provided with an avoidance hole for the ejector rod to movably pass through;
a limit screw with adjustable height along the axial direction of the ejector rod is arranged on the rod section of the ejector rod in the inner concave cavity;
the limit screw is contacted and abutted with the inner end surface of the sealing cover.
4. A casing defect testing device according to claim 1, wherein the resilient member is a spring.
5. The sleeve defect testing device according to claim 1, wherein an insulating fixed cylinder is arranged at the bottom of the testing chamber;
The middle part of the fixed cylinder is provided with a mounting through cavity;
the fixed cylinder is provided with a plurality of communication holes which are communicated with the mounting through cavity and the test cavity;
a support bar is arranged on the inner wall of the mounting through cavity near the bottom;
The low-voltage electrode is arranged on the supporting bar;
The high-voltage electrode is movably arranged in the mounting through cavity and is positioned above the high-voltage electrode;
the oilpaper insulation model is installed in the installation through cavity and is located between the high-voltage electrode and the high-voltage electrode.
6. The sleeve defect testing device according to claim 1, wherein the oiled paper insulation model is formed by overlapping a plurality of layers of insulation paper and a plurality of layers of aluminum foils.
7. The casing defect testing device of claim 1, wherein the temperature control mechanism comprises a circulation pump and a heater;
The inlet of the circulating pump is communicated with the heating chamber through a first conveying pipe, and the outlet of the circulating pump is communicated with the inlet of the heater through a second conveying pipe;
the outlet of the heater is communicated with the heating chamber through a third conveying pipe.
8. A casing defect testing method, characterized by being applied to the casing defect testing device as claimed in any one of claims 1 to 7, comprising:
preparing an oilpaper insulation model;
Installing the prepared oilpaper insulation model between a high-voltage electrode and a high-voltage electrode, and connecting the high-voltage electrode with a temperature control mechanism;
Mounting the can lid such that the abutment of the first wiring mechanism is in contact with the high voltage motor;
Vacuumizing the test tank;
Injecting insulating oil into the test tank and standing for a preset time;
connecting the high-voltage electrode and the low-voltage electrode to a voltage output end and a current input end of a dielectric loss testing device respectively;
And starting a temperature control mechanism, and starting the dielectric loss testing device to test when the high-voltage electrode is controlled to be stabilized at a preset temperature by the temperature control mechanism.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967652A (en) * | 2012-12-05 | 2013-03-13 | 哈尔滨理工大学 | Electric strength inspection device for oil paper compound insulation oil during flowing |
| CN104133165A (en) * | 2014-07-07 | 2014-11-05 | 广东电网公司电力科学研究院 | Transformer oilpaper insulation test system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU34801U1 (en) * | 2003-08-26 | 2003-12-10 | Закрытое акционерное общество Московский завод "Изолятор" им. А. Баркова | Resin impregnation chamber for paper-insulated high-voltage input core |
| CN102096032B (en) * | 2011-01-06 | 2013-03-06 | 山东电力研究院 | Experimental facility and method for electric heating combined stress aging with oil-paper insulation of transformer |
| CN103105568B (en) * | 2013-01-16 | 2016-04-13 | 重庆市电力公司电力科学研究院 | Aging and the local discharge integrated experimental provision of transformer oil paper insulated electrothermic associating |
| WO2016095127A1 (en) * | 2014-12-17 | 2016-06-23 | 阿尔斯通技术有限公司 | Insulation dielectric response test system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967652A (en) * | 2012-12-05 | 2013-03-13 | 哈尔滨理工大学 | Electric strength inspection device for oil paper compound insulation oil during flowing |
| CN104133165A (en) * | 2014-07-07 | 2014-11-05 | 广东电网公司电力科学研究院 | Transformer oilpaper insulation test system |
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Effective date of registration: 20240520 Address after: 562400 No.1 Beijing Road, Jushan street, Xingyi City, Qianxinan Buyi and Miao Autonomous Prefecture, Guizhou Province Applicant after: Southern Power Grid Energy Storage Co.,Ltd. Western Maintenance and Testing Branch Country or region after: China Applicant after: China South Power Grid International Co.,Ltd. Address before: 562400 No.1 Beijing Road, Jushan street, Xingyi City, Qianxinan Buyi and Miao Autonomous Prefecture, Guizhou Province Applicant before: China Southern power grid peak load regulation and frequency modulation power generation Co.,Ltd. Western maintenance test branch Country or region before: China Applicant before: China South Power Grid International Co.,Ltd. |
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