CN113188915B - Performance detection method of high-voltage epoxy sleeve - Google Patents
Performance detection method of high-voltage epoxy sleeve Download PDFInfo
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- CN113188915B CN113188915B CN202110534515.XA CN202110534515A CN113188915B CN 113188915 B CN113188915 B CN 113188915B CN 202110534515 A CN202110534515 A CN 202110534515A CN 113188915 B CN113188915 B CN 113188915B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
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- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/60—Investigating resistance of materials, e.g. refractory materials, to rapid heat changes
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Abstract
The invention relates to a performance detection method of a high-voltage epoxy sleeve, belonging to the technical field of cable accessories. The method comprises the following specific steps: carrying out X-ray nondestructive testing on the high-voltage epoxy sleeve; if the interior of the epoxy sleeve is free from defects, the high-voltage epoxy sleeve is placed into a high-low temperature alternating test box for high-low temperature cold-hot alternating test detection and then X-ray nondestructive test; if the interior of the epoxy casing is free from defects, performing compression resistance detection on the high-voltage epoxy casing, and then performing X-ray nondestructive detection; if the interior of the epoxy casing is free from defects, performing anti-bending detection and then performing X-ray nondestructive detection; and if the interior of the epoxy sleeve is free of defects, taking a small amount of high-voltage epoxy sleeve as a sample to perform a glass transition temperature test, detecting whether the Tg value meets the requirement, and if the epoxy sleeve is not cracked through X-ray detection at last and the Tg value also meets the requirement, finishing the performance detection. The invention is easy to realize, has low cost and can simulate various severe external environments to finish detection.
Description
Technical Field
The invention relates to a performance detection method of a high-voltage epoxy sleeve, belonging to the technical field of cable accessories.
Background
With the rapid development of national economy and the further acceleration of urbanization process, the urban power consumption is increasing day by day, new and improved power grids appear in large batch, and the demand for high-voltage cable accessories with the voltage level of 110KV and above is more urgent. Because of the rapid change in global climate, various bad weather is increasing. A particularly severe challenge is presented by the temperature-sensitive, environmentally-and operationally-demanding components of high-voltage cable accessories in cable systems.
The high-voltage epoxy sleeve is one of cable accessories, plays a role in isolating a cable conductor from a strong current, homogenizing an electric field and protecting an internal cable broken end, belongs to an industrial ceramic insulating product, and is sensitive to temperature and external mechanical impact. Most products run under outdoor conditions, and are very easily influenced by force applied when the products are installed from the outside, lateral force applied by a cable bent to the products, impact of external temperature change and uncertain short-time strong current. It can be said that the cable accessories are subjected to severe conditions during operation. Also for this reason, the cable accessories are also susceptible to some faults during operation. However, the quality of the epoxy sleeve, which is a key component in the cable accessory, is problematic, and the epoxy sleeve will have a serious influence on the whole power system.
In order to ensure that the produced epoxy casing is of reliable quality and can withstand the harsh environment, before leaving the factory, some destructive tests are required to check whether the performance of the product meets the use requirements. The existing detection method has high requirements on instruments, high economic cost and insufficient consideration on external severe operating environment, so that performance detection results are relatively comprehensive.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a performance detection method of a high-voltage epoxy bushing.
The invention relates to a performance detection method of a high-voltage epoxy bushing, which comprises the following steps:
step S1: x-ray nondestructive testing: placing the high-voltage epoxy casing inside an X-ray nondestructive testing device, testing whether the inside of the high-voltage epoxy casing has defects, and if not, carrying out subsequent steps;
step S2: and (3) detecting a high-low temperature cold-hot alternation test: placing the high-voltage epoxy sleeve into a high-low temperature alternating test box, and setting detection parameters for detection;
and step S3: x-ray nondestructive testing: placing the high-voltage epoxy casing inside an X-ray nondestructive testing device, testing whether the inside of the high-voltage epoxy casing has defects, and if not, carrying out subsequent steps;
and step S4: adopt the hydraulic seal to detect the frock and carry out resistance to compression detection to high-pressure epoxy sleeve pipe: the hydraulic sealing detection tool comprises a sealing tank, the sealing tank is connected with a water pump through a water pipe, one end of the water pipe, which is close to the sealing tank, is also provided with a pressure gauge, a high-pressure epoxy sleeve is placed into the sealing tank, the water pressure is filled, the reading of the pressure gauge is observed, the pressure value required by detection is kept for a period of time, and whether the high-pressure epoxy sleeve cracks or has other abnormal changes or not is visually observed;
step S5: x-ray nondestructive testing: placing the high-voltage epoxy sleeve inside an X-ray nondestructive testing device, testing whether the inside of the high-voltage epoxy sleeve has defects, and if not, carrying out the subsequent steps;
step S6: adopting an anti-bending tool to carry out anti-bending detection on the high-voltage epoxy sleeve: the bending-resistant tool comprises a horizontal plate, a vertical plate and a jack arranged above the horizontal plate, wherein a round steel bar is arranged above the jack, a load sensor is arranged below the jack, the load sensor is connected with a digital display instrument, one end of a high-voltage epoxy sleeve is fixed on the vertical plate, a bending bar is fixed inside the other end of the high-voltage epoxy sleeve, the lower part of the bending bar is abutted against the round steel bar, the jack applies lateral bending force to the high-voltage epoxy sleeve during detection, the reading of the digital display instrument is observed, the required bending force is kept for a period of time, and whether the high-voltage epoxy sleeve cracks or other abnormal changes is visually observed;
step S7: x-ray nondestructive testing: placing the high-voltage epoxy casing inside an X-ray nondestructive testing device, testing whether the inside of the high-voltage epoxy casing has defects, and if not, carrying out subsequent steps;
step S8: glass transition temperature detection: and (3) putting a part of the high-voltage epoxy sleeve as a sample into a glass transition temperature testing instrument for testing, measuring the value of the glass transition temperature, recording the value as the Tg value, checking whether the process requirement is met, and if so, finishing the test.
Preferably, the monitoring parameters in step S2 include temperature variation range, temperature rise rate, holding time, and number of alternating cycles.
Preferably, in the step S2, the temperature change range is-40 ℃ to 95 ℃, the temperature increase and decrease rate is 1 ℃/min, the temperature is kept for 6 hours at-40 ℃ and 95 ℃, 10 alternating cycles of high-temperature and low-temperature transformation are carried out, and the total time is 164 hours. The method can simulate the temperature change of the high-voltage epoxy sleeve in four seasons under the condition of electrifying operation of a real installation site for a long time, and detect the adverse effect of cold and hot temperature impact on the high-voltage epoxy sleeve.
Preferably, in the step S4, the sealing can is formed by welding after being formed by winding and forming a steel plate, the bottom of the sealing can is in an arc bottom-sinking type shape, and the bottom of the sealing can is fixed on a tray with traveling wheels. The bottom adopts the circular arc to sink the withstand voltage requirement of bottom formula appearance for the load pressure vessel, and the sealed tank is fixed on the tray of taking the walking wheel and is convenient for the sealed detection frock of integral movement water pressure.
Preferably, the water pipe in the step S4 is a rubber wire hose. Meets the pressure-resistant requirement and prevents the water pipe with overlarge water pressure from cracking.
Preferably, the water pump in the step S4 is a manual hydraulic pump. The manual hydraulic pump is convenient for micro-control of the pumped water pressure, the detection process is more flexible, and the cost can be reduced.
Preferably, in the step S4, during the detection, a part of water is filled into the sealed tank, the high-pressure epoxy sleeve is placed into the sealed tank, the high-pressure epoxy sleeve is higher than the sealed tank, whether the water surface in the sealed tank is fast filled up to the upper port of the sealed tank is checked, if not, water is replenished, the high-pressure epoxy sleeve and the sealed tank form a sealed cavity through the flange and the sealing ring, and 1/2 of the water in the water tank is added into the water pump. When the water pressure detection is adopted, higher pressure intensity can be achieved due to the water pressure, and compared with air pressure detection, the air pressure detection device is safer and is not easy to hurt people.
Preferably, a back-fastening nylon block is installed inside the high-voltage epoxy sleeve in the step S6, and the back-fastening nylon block is sleeved outside the bending bar. One end of the bending bar is fixed by the back-fastening nylon block, so that the stress dispersion of the high-voltage epoxy sleeve caused by the rigid contact of the bending bar and the high-voltage epoxy sleeve is avoided.
Preferably, the block sample is selected in step S8, and the surface of the block sample is polished to a regular plane. The surface of the block sample is a regular plane and can be fully contacted with the bottom of the crucible, which is beneficial to the stability of the detection data.
The beneficial effects of the invention are: the performance detection method of the high-voltage epoxy casing pipe adopts an economic and scientific means to design a method for detecting the performance of the high-voltage epoxy casing pipe, utilizes the existing equipment, is easy to realize a newly manufactured tool, has low cost, fully considers various harsh external environments of the high-voltage epoxy casing pipe in the using and running process, and adopts a more rigorous means to simulate the adverse effect of the environments on the high-voltage epoxy casing pipe so as to achieve the purpose of detection.
Drawings
FIG. 1 is a block flow diagram of the present invention.
FIG. 2 is a schematic diagram of a setting interface of high and low temperature alternation parameters.
Fig. 3 is a schematic structural diagram of a 500KV epoxy bushing compression-resistant tool.
Fig. 4 is a schematic structural diagram of a 220KV epoxy bushing compression-resistant tool.
Fig. 5 is a schematic structural diagram of a 110KV epoxy bushing compression-resistant tool.
Fig. 6 is a schematic structural view of the bending-resistant tooling.
Fig. 7 is a schematic structural view of the socket head wrench tooling.
FIG. 8 is a schematic view of the operation interface of the new inspection program.
FIG. 9 is a schematic view of the operation interface of the new testing program successfully connected with the testing instrument.
Fig. 10 is a schematic view of an operation interface for detecting formal start.
Fig. 11 is an operation interface diagram for opening the second-pass detection program.
FIG. 12 is a schematic view of an operator interface for performing curve analysis.
FIG. 13 is a graph showing the results of curve analysis.
In the figure: 1. a water pump; 2. a water pipe; 3. a pressure gauge; 4. converting a flange plate seal ring; 5. a high-voltage epoxy bushing; 6. compressing the flange; 7. converting the flange plate; 8. sealing the tank; 9. a tray; 10. water; 11. a horizontal plate; 12. a vertical plate; 13. a digital display instrument; 14. a jack; 15. round steel rods; 16. bending the bar; 17. a back-fastened nylon block; 18. a load sensor; 19. a lifting rope; 20. hexagon socket head wrench frock.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment is as follows:
as shown in fig. 1, the method for detecting the performance of the high-voltage epoxy bushing 5 according to the present invention includes the following steps:
step S1: carrying out nondestructive X-ray detection;
step S2: detecting a high-low temperature cold-hot alternation test;
and step S3: carrying out nondestructive X-ray detection;
and step S4: carrying out compression resistance detection on the high-voltage epoxy sleeve 5 by adopting a hydraulic seal detection tool;
step S5: nondestructive X-ray detection;
step S6: carrying out anti-bending detection on the high-voltage epoxy sleeve 5 by adopting an anti-bending tool;
step S7: carrying out nondestructive X-ray detection;
step S8: detecting the glass transition temperature;
the specific operation of the steps is as follows:
a voltage grade selects an epoxy sleeve, an X-ray nondestructive testing device is used for checking whether the inside has defects such as cracking and the like, the X-ray nondestructive testing device adopts real-time imaging nondestructive testing equipment and comprises a high-voltage generator, a high-voltage ray tube, a digital imaging panel, a lead room, a movable workbench, control software and an operation control cabinet with an image display function, the high-voltage epoxy sleeve 5 is placed inside the lead room, X-rays are irradiated, an X-ray imaging piece is observed on the operation control display cabinet, whether the inside has defects is checked, and if the inside has no defects, the next step is carried out; the tube voltage generated by the high-voltage generator is 225KV, so that X rays can conveniently penetrate through the thick epoxy sleeve, the focus of the X-ray tube is 0.4mm and 1mm, and the minimum defects which can be distinguished are 0.1mm cracks and 0.2mm metal impurities.
If the X-ray nondestructive test does not find the defects of cracks and the like in the high-voltage epoxy sleeve 5, the high-voltage epoxy sleeve 5 is put into a high-low temperature alternating test box, the internal volume of the high-low temperature alternating test box is large enough, and the volume is more than or equal to 1.6m 3 Can accommodate a plurality of high-voltage ringsThe uniformity of the temperature in the oxygen bushing 5 is less than or equal to 2 ℃, the temperature rise and fall rate is 0.7-1 ℃/min, the lowest temperature which can be generated is-40 ℃, the highest temperature is 150 ℃, the temperature alternation range is-40-100 ℃, the alternation parameters are set, as shown in figure 2, the temperature is reduced from room temperature to-40 ℃, the temperature reduction speed is 1 ℃/min, the temperature is maintained at-40 ℃ for 6 hours, the temperature is increased from-40 ℃ to 95 ℃, the temperature rise speed is 1 ℃/min, the temperature is maintained at 95 ℃ for 6 hours, then the temperature is reduced from 95 ℃ to-40 ℃, the temperature reduction speed is 1 ℃/min, the cycle is carried out for 10 times, the alternation detection is carried out according to the temperature, the time is about 164 hours, and the detection simulates the adverse effects of the cold and hot temperature impact on the epoxy bushing 5 under the real installation site power-on-off operation for a long time and the temperature change of four seasons.
And if the high-voltage epoxy sleeve 5 is taken out after the high-temperature and low-temperature alternating detection and passes the X-ray nondestructive detection again, the next compression resistance detection is carried out if no cracking phenomenon is found. And designing a hydraulic sealing detection tool according to the size of the high-pressure epoxy sleeve 5 and the size and the hole pitch of the flange on the installation site. The hydraulic seal detects frock mainly includes: the pressure testing device comprises a manual pressure testing water pump 1, a water pipe 2, a pressure gauge 3 and a sealing tank 8, wherein the sealing tank 8 is formed by winding and welding a Q235-A steel plate with the thickness of 6mm, the bottom of the sealing tank is in an arc bottom sinking type shape, the pressure resistance requirement of a load pressure container is met, and the sealing tank 8 is fixed on a tray 9 with 4 traveling wheels, so that the detection tool is convenient to move integrally; the sealed tank 8 is connected with a water pump 1 through a water pipe 2 and a pipe head, the water pipe 2 uses a rubber steel wire hose with the pressure resistance of 8MPa, and the water pump 1 uses a manual pressure test water pump with the maximum pressure of 16MPa, so that the water pressure is easy to control through manual operation; one end of the water pipe 2 close to the seal tank 8 is connected with a pressure gauge 3, the measuring range of the pressure gauge 3 is 4MPa, the diameter of a dial plate is 150mm, and the large dial plate is convenient for clear observation and reading; the sealing tank 8 and the top of the high-pressure epoxy sleeve 5 form a sealing cavity through a sealing ring and a flange.
As shown in fig. 3, taking a 500KV high-voltage epoxy bushing 5 as an example, when pressure resistance detection is performed, firstly, a part of water 10 is filled in a sealed tank 8, a sealing ring is placed in a sealing ring groove of a flange, silicone grease is uniformly coated on the sealing ring to ensure sealing performance, then a conversion flange plate 7 is placed on the sealed tank 8, bolts are screwed, the bolts are all 8.8-level high-strength bolts, and the sealing ring is made of silicone rubber or butadiene-acrylonitrile rubber; the method comprises the steps that a sealing ring 4 of a conversion flange plate 7 is placed in a sealing ring groove of the conversion flange plate 7, a certain amount of silicone grease is uniformly coated on a sealing ring, a high-pressure epoxy sleeve 5 is placed above a sealing tank 8, the high-pressure epoxy sleeve 5 is immersed in water 10 of the sealing tank 8, only the end part of the high-pressure epoxy sleeve is left outside the sealing tank 8, whether the water surface in the sealing tank 8 is quickly filled to an upper port of the sealing tank 8 is checked, if not, water is appropriately supplemented, and the detection efficiency is reduced because the water amount pumped by a water pump 1 every time is limited and excessive water amount needs to be filled for a long time; installing a compression flange 6 on a high-voltage epoxy sleeve 5, and screwing bolts, wherein the compression flange 6 is designed by referring to an installation drawing of IEC62271-209 about the connection of a dry cable and a high-voltage electrical GIS, and the thickness can be properly thickened so as to ensure the safety caused by over-high pressure during detection; adding water 10 of about 1/2 of a water tank into the water pump 1, pressing a handle of the water pump 1, observing the reading of the pressure gauge 3, when the reading is up to 2.3MPa, slowly pressing the handle to enable a pointer of the pressure gauge 3 to point to a position of 2.5MPa, then flushing the pointer to a little to a reading of 2.6MPa, and after a period of time, enabling the pointer of the pressure gauge 3 to fall back to a little and keep at the position of 2.5MPa, so that the pressure of 2.5MPa is kept for about 1 hour, and observing whether the high-pressure epoxy sleeve 5 cracks or other abnormal changes. And taking out the high-voltage epoxy sleeve 5 for X-ray nondestructive testing, and entering the next step of testing if no cracking phenomenon is found.
As shown in fig. 4, for the high-voltage epoxy bushing 5 of 220KV, the method and steps of the compression-resistant detection are the same as those of the high-voltage epoxy bushing 5 of 500KV, except that the conversion flange plate 7 and the corresponding sealing ring on the sealing can 8 are not required, and the water pressure reaches 2.2 MPa.
As shown in fig. 5, for a 110KV high-voltage epoxy bushing 5, the method and steps of the compression-resistant detection are the same as those of the 500KV high-voltage epoxy bushing 5, except that only the conversion flange plate 7 on the sealing can 8 is changed into another conversion flange plate 7, and the water pressure reaches 2.0 MPa.
As shown in fig. 6, the bending-resistant tool for bending-resistant detection includes a vertical plate 12 supported by a steel plate with a thickness of 30mm, a horizontal plate 11 made of a steel plate with a thickness of 25mm, a bending bar 16, a jack 14, a load sensor 18 and a digital display 13, wherein two 10# channel steels are welded at the bottom of the horizontal plate 11 as reinforcing ribs, 16mm rear steel plates are used as large reinforcing ribs on two sides of the vertical plate 12, the vertical plate 12 and the horizontal plate 11 are connected and fastened by 4 rows of M16 high-strength bolts (8.8 levels), after installation, the horizontal plate 11 is used as a reference, the left side of the vertical plate 12 is processed by a boring machine to install the surface of the high-pressure epoxy sleeve 5, so as to ensure that the installation surfaces of the horizontal plate 11 and the vertical plate 12 are 90 ° perpendicular, and bolt installation holes of the high-pressure epoxy sleeves 5 of 110KV, 220KV and 500KV are respectively drilled on the vertical plate 12, and are distributed around the circumference with a circular hole in a symmetrical manner.
As shown in fig. 7, in order to facilitate the installation of the epoxy sleeve pipe to tighten the M20 × 65 socket head cap bolt inside, a six-part galvanized pipe and a steel bar with a diameter of 20mm are welded to manufacture an elongated socket head cap wrench tool 20, and an outer hexagon head is welded to the front end of the tool and can be inserted into a countersunk groove of the socket head cap bolt, and the outer hexagon head needs to be quenched.
The anti-bending test specifically operates as follows:
the high-voltage epoxy sleeve 5 is placed horizontally, a fastening nylon block 17 is placed inside the high-voltage epoxy sleeve 5 to sleeve a bending bar 16, an M20 socket head cap screw is screwed into a screw hole at the end part of the bending bar 16 by using a socket head wrench tool 20, meanwhile, the screw is screwed, and the bending bar 16 and the high-voltage epoxy sleeve 5 are fixed, so that the bending bar 16 and the high-voltage epoxy sleeve 5 are assembled into a whole, the whole is lifted by using a lifting rope 19 and is installed on the vertical plate 12 through the screw; a base plate is placed above a horizontal plate 11 and about 1000mm away from a vertical plate 12, a load sensor 18 is placed above the base plate, a jack 14 is placed above the load sensor 18, the extending amount of the jack 14 is adjusted, a round steel bar 15 is placed between the jack 14 and a bending bar 16, the round steel bar 15 and the bending bar 16 are slightly tightly pushed, then the load sensor 18 is connected with a digital display instrument 13 through a lead, the operating rod of the jack 14 is slowly pressed, a determined part is slowly lifted upwards, the reading of the digital display instrument 13 is observed, the operation is stopped when the reading is 13.0, the jack 14 is pressed upwards, the reading is enabled to lock the oil plug of the jack 14 at about 13.2, and the holding time is kept for 1 hour. In the process, oil return is caused by extremely slight leakage of the jack 14, the pressure is slightly lost, and the reading of the digital display instrument 13 becomes 13.0. In addition, if the bending lever 16 is found to be significantly warped upwards in the process but the high-voltage epoxy bushing 5 is not damaged, the jack 14 needs to be loosened, and the socket head wrench 20 is used to align the socket head cap bolt through the central hole of the vertical plate 12 for tightening again, and the bolt is also tightened. After the screw is tightened, the bending bar 16 is pressed tightly by the jack 14 again, the reading of the digital display instrument 13 is read, the reading is kept at 13.1, the jack 14 is locked, and the reading is kept for 1 hour. And taking out the high-voltage epoxy sleeve 5, and performing X-ray nondestructive detection, and entering the next detection step if the high-voltage epoxy sleeve is not damaged or cracked.
The operation steps of 500KV, 110KV and 220KV are similar, the difference is that the bending bar 16 and the back fastening nylon block 17 are different, the rod diameter of the 500KV bending bar 16 is 60mm, the diameter of the 220KV bending bar 16 and the 110KV bending bar 16 are 50mm, the back fastening nylon block 17 matched with the bending bar 16 needs to be determined by the size of the inner cavity and the insert of the high-voltage epoxy sleeve 5, and when one end of the bending bar 16 is jacked up by the jack 14, the other end of the bending bar 16 is fixed.
The specific steps of the glass transition temperature detection are as follows: a computer and a DSC1 instrument for detection are opened, the DSC1 instrument adopts a Mettler & Telephon instrument, the stability is good, the precision is high, the repeatability is good, a displayed curve is fine and smooth, and the observation and the analysis are convenient; double-click opens the detection program on the computer desktop, and enters the dialogue interface of the stare.sw10.0 software, as shown in fig. 8, a new test program is created: the temperature is raised from 25 ℃ at the room temperature, the temperature raising speed is 20 ℃/min, the temperature is raised to 140 ℃, the weight of the sample is set to be 20mg, and the program name is stored: 11, sending the program to the DSC1 instrument, where the red light flashing on the instrument changes to green, and at the same time the bar below the software also changes to green, as shown in fig. 9; a small sample is taken from the high-voltage epoxy sleeve 5, the sample is put on 320-mesh sand paper and is polished into a plane and a small round cake shape, the size is about 3-4 mm, the thickness is about 1-2 mm, when the lower frame of a software interface of a computer DSC1 shows 25 ℃, a green indicator lamp flickers to prompt that the sample can be put in, the sample is put in a dry fruit for detection, then a crucible filled with the sample is added on a sample tweezers tray 9 of a DSC1 differential type thermal scanner, a cover of a detection instrument is covered, and the 'OK' on the right lower part of the software interface is clicked, so that the green flickering and the like become red, and the detection formally starts, as shown in figure 10.
A curve which changes starts to appear in a two-dimensional heat/time coordinate, when the temperature reaches 140 ℃, a red light is changed into green, OK at the right lower part of a software interface is clicked, according to the step, the original sample in the crucible is used for detection again, and the detection is stored and named as: after the second detection is finished, opening the software to pull up and down the "Evaluation window" in the menu Session, opening the "Open _ cut" dialog box, selecting the name "12" of the second detection, as shown in fig. 11, popping up the Curve of the second detection after the detection result is opened, analyzing the Curve, selecting the part with obvious gradient in the horizontal section of the Curve by using a mouse frame, and clicking the option "Glass Transition" pulled down by the "DSC" menu of the software dialog box, as shown in fig. 12; the calculated glass transition temperature (Tg value) is automatically popped up from the software, and the value of "Midpoint" is shown in the figure, which is the value of the measured glass transition temperature at this time, as shown in FIG. 13. In comparison to the technical standard, if the Tg value is greater than 108 deg.C, the material used for the high-voltage epoxy bushing 5 is considered to be cured satisfactorily.
The beneficial effects of the invention are: the performance detection method of the high-voltage epoxy sleeve provided by the invention fully considers the influence of mechanical impact and temperature impact on the high-voltage epoxy sleeve aiming at the physical and mechanical performance of the high-voltage epoxy sleeve and the stress condition of an installation and use site, and simulates the external influence by adopting the harsh impression degree exceeding a real scene.
The invention can be widely applied to the occasions of cable accessories.
It is well within the skill of those in the art to implement and protect the present invention without undue experimentation and without undue experimentation that the present invention is directed to software and process improvements.
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The performance detection method of the high-voltage epoxy bushing is characterized by comprising the following steps of:
step S1: x-ray nondestructive testing: placing the high-voltage epoxy sleeve (5) into an X-ray nondestructive testing device, testing whether the inside of the high-voltage epoxy sleeve (5) has defects or not, and if not, carrying out the subsequent steps;
step S2: and (3) detecting a high-low temperature cold-hot alternation test: placing the high-voltage epoxy sleeve (5) into a high-low temperature alternating test box, and setting detection parameters for detection; monitoring parameters comprise a temperature change range, a heating rate, a heat preservation time and alternating cycle times, wherein the temperature change range is-40 ℃ to 95 ℃, the heating and cooling rate is 1 ℃/min, the temperature is preserved for 6 hours at-40 ℃ and 95 ℃, 10 alternating cycles of high-temperature and low-temperature transformation are worked, and the total time is 164 hours;
and step S3: x-ray nondestructive testing: placing the high-voltage epoxy sleeve (5) into an X-ray nondestructive testing device, testing whether the inside of the high-voltage epoxy sleeve (5) has defects or not, and if not, carrying out the subsequent steps;
and step S4: adopt the hydraulic seal to detect frock and carry out resistance to compression detection to high-pressure epoxy sleeve pipe (5): the hydraulic pressure sealing detection tool comprises a sealing tank (8), the sealing tank (8) is connected with a water pump (1) through a water pipe (2), a pressure gauge (3) is further installed at one end, close to the sealing tank (8), of the water pipe (2), the high-pressure epoxy sleeve (5) is placed into the sealing tank (8), water pressure is filled through the water pump (1), the reading of the pressure gauge (3) is observed, the required pressure value is kept for detection for a period of time, and whether the high-pressure epoxy sleeve (5) cracks or is abnormally changed or not is visually observed; during detection, firstly, filling a part of water (10) into a sealed tank (8), putting a high-pressure epoxy sleeve (5) into the sealed tank (8), enabling the high-pressure epoxy sleeve (5) to be higher than the sealed tank (8), checking whether the water surface in the sealed tank (8) is quickly filled to the upper port of the sealed tank (8), if not, supplementing water, enabling the high-pressure epoxy sleeve (5) and the sealed tank (8) to form a sealed cavity through a flange and a sealing ring, and adding 1/2 of water (10) of a water tank into a water pump (1);
step S5: x-ray nondestructive testing: placing the high-voltage epoxy sleeve (5) into an X-ray nondestructive testing device, testing whether the inside of the high-voltage epoxy sleeve (5) has defects or not, and if not, carrying out the subsequent steps;
step S6: adopting an anti-bending tool to carry out anti-bending detection on the high-voltage epoxy sleeve (5): the bending-resistant tool comprises a horizontal plate (11), a vertical plate (12) and a jack (14) arranged above the horizontal plate (11), wherein a round steel bar (15) is arranged above the jack (14), a load sensor (18) is arranged below the jack (14), the load sensor (18) is connected with a digital display instrument (13), one end of a high-voltage epoxy sleeve (5) is fixed on the vertical plate (12), a bending bar (16) is fixed inside the other end of the high-voltage epoxy sleeve (5), the lower part of the bending bar (16) is abutted against the round steel bar (15), the jack (14) applies lateral bending force to the high-voltage epoxy sleeve (5) during detection, the reading of the digital display instrument (13) is observed, the required bending force is kept for a period of time, and whether the high-voltage epoxy sleeve (5) cracks or other abnormal changes are visually observed;
step S7: x-ray nondestructive testing: placing the high-voltage epoxy sleeve (5) into an X-ray nondestructive testing device, testing whether the inside of the high-voltage epoxy sleeve (5) has defects or not, and if not, carrying out the subsequent steps;
step S8: glass transition temperature detection: and taking a part of the high-voltage epoxy sleeve (5) as a sample, putting the part of the high-voltage epoxy sleeve into a glass transition temperature testing instrument for testing, measuring the value of the glass transition temperature, recording the value as a Tg value, checking whether the process requirement is met, and if so, finishing the test, wherein the sample is a block sample, and the surface of the block sample is polished into a regular plane.
2. The performance detection method of the high-voltage epoxy bushing according to claim 1, wherein in the step S4, the sealing tank (8) is formed by winding and welding steel plates, the bottom of the sealing tank is in an arc-shaped sunk-bottom shape, and the bottom of the sealing tank is fixed on a tray (9) with traveling wheels.
3. The method for detecting the performance of the high-pressure epoxy bushing according to claim 1, wherein the water pipe (2) in the step S4 is a rubber steel wire hose.
4. The performance detection method of the high-voltage epoxy casing pipe according to claim 1, wherein the water pump (1) in the step S4 is a manual pressure test water pump.
5. The performance detection method of the high-voltage epoxy bushing according to claim 1, wherein a back-tension nylon block (17) is installed inside the high-voltage epoxy bushing (5) in the step S6, and the back-tension nylon block (17) is sleeved outside the bending bar (16).
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