CN108594091B - Electrical performance measuring device and method for longitudinally-stretched insulating dielectric medium - Google Patents
Electrical performance measuring device and method for longitudinally-stretched insulating dielectric medium Download PDFInfo
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- CN108594091B CN108594091B CN201810430547.3A CN201810430547A CN108594091B CN 108594091 B CN108594091 B CN 108594091B CN 201810430547 A CN201810430547 A CN 201810430547A CN 108594091 B CN108594091 B CN 108594091B
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- 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
- G01R31/1272—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 of cable, line or wire insulation, e.g. using partial discharge measurements
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Abstract
The invention provides a device and a method for measuring electrical property of a longitudinal stretching insulating dielectric medium, and the technical scheme is as follows: a longitudinal stretching insulating dielectric electrical property measuring device comprises a high-voltage power supply, a supporting frame, a fixed seat arranged on the supporting frame, a limiting disc matched with the fixed seat from the lower part of the fixed seat, a rotating shaft respectively connected with the supporting frame and the limiting disc in a threaded manner, an upper electrode part, a lower electrode part and a driving assembly for driving the lower electrode part, wherein the rotating shaft is positioned below the limiting disc and is sequentially connected with the rotating shaft; the electrode assembly further comprises a hollow sealed cavity covering the upper electrode part and the lower electrode part. The invention has the beneficial effects that: the invention realizes the measurement of the original shape of the insulating dielectric sample and the breakdown field strength after stretching in the direction of the upper electrode and the lower electrode, breaks through the limitation that the tested insulating dielectric sample can only be transversely stretched, and realizes the analog measurement of the insulating dielectric sample in the stretching and pressure states.
Description
Technical Field
The invention relates to the technical field of experimental measurement for measuring the change rule of the dielectric strength of an insulating dielectric sample along with the deformation in the direction of an electric field, in particular to a device and a method for measuring the electrical property of a longitudinally stretched insulating dielectric.
Background
At present, the exploration of insulating materials for high-voltage direct-current cables belongs to research hotspots, and particularly, with the rapid development of nano composite insulating materials and chemically modified insulating materials, the research on the basic dielectric property of novel composite materials becomes more and more extensive and deeper. In experiments, the influence of different deformation states of the insulating dielectric composite material on the conductivity or the direct-current breakdown strength of the insulating dielectric composite material under the actual operation state of the cable is simulated, so that the method has important significance. However, the existing experimental measurement device for the conductivity or the direct current breakdown strength of the insulating dielectric sample can only realize the stretching in the cross section direction or the compression in the longitudinal direction of the sample, and can not study the change characteristics of the dielectric property when the sample is subjected to stretching deformation in the electric field direction.
How to solve the above technical problems is the subject of the present invention.
Disclosure of Invention
The invention aims to provide a longitudinal stretching insulating dielectric electrical property measuring device and a measuring method thereof, which can realize the measurement of the original shape in the direction of an upper electrode and a lower electrode and the breakdown field intensity after stretching and overcome the limitation that a sample to be measured can only be stretched transversely.
In order to achieve the purpose, the invention provides a device for realizing electrical performance experiment measurement of a longitudinally-stretched insulating dielectric medium, which comprises a high-voltage power supply, a supporting frame, a fixed seat arranged on the supporting frame, and a limiting disc matched with the fixed seat from the lower part of the fixed seat, wherein a rotating shaft in threaded connection with the supporting frame and the limiting disc respectively, an upper electrode part, a lower electrode part and a driving assembly for playing the lower electrode part are positioned below the limiting disc and are sequentially connected with the rotating shaft.
The upper electrode part comprises an upper electrode toothed disc buckled with an annular inner toothed groove in the bottom surface of the limiting disc, a guide sleeve arranged at the center of the upper electrode toothed disc, and an access plate which connects the guide sleeve and the upper electrode toothed disc with each other and is circumferentially arranged, wherein slots are formed in the access plate, a plurality of slots are formed in the circumference of the bottom surface of the guide sleeve at equal intervals, upper electrode binding posts are arranged in the slots, and each upper electrode binding post is connected with an upper electrode.
The upper electrode part further comprises a molten insulating dielectric medium sample adhering and supporting guide piece which is mutually inserted into the slots on the butt strap, the molten insulating dielectric medium sample adhering and supporting guide piece is composed of a conical sleeve, an annular guide sleeve connected onto the conical sleeve, and elastic supporting elements arranged on the top surface of the annular guide sleeve at equal intervals on the circumference, and the elastic supporting elements comprise guide rods connected onto the top surface of the annular guide sleeve at equal intervals and compression springs sleeved on the guide rods.
The molten insulating dielectric sample adhering and supporting guide member is filled in the circumference of the upper electrode and the lower electrode which are arranged on the circumference.
The bottom electrode part is including connecting at the epaxial central adapter sleeve of rotation, circumference equidistant setting is in a plurality of splice bar in the central adapter sleeve outside sets up splice bar free end portion, and with the concentric cavity toper friction member that sets up of central adapter sleeve to and equidistant setting is in a plurality of boss of central adapter sleeve top surface set up the bottom electrode terminal on each boss, each bottom electrode terminal on connect a bottom electrode.
The upper electrode part and the lower electrode part are respectively in threaded connection with the connecting part of the rotating shaft, the hollow conical friction piece of the lower electrode part is driven to be in mutual abutting joint with the inner side face of the conical sleeve of the molten insulating dielectric sample adhesion supporting guide piece by rotating a rotating hand wheel at the top of the rotating shaft or a power driving rod of a handheld driving assembly along the axis direction of the rotating shaft, the lower electrode part is driven to move along the rotating shaft to the upper electrode gear disc by the friction force between the hollow conical friction piece and the conical sleeve, and then the distance between the upper electrode and the lower electrode, namely the thickness of the measured molten insulating dielectric sample, is automatically adjusted.
The driving assembly is composed of an annular connecting sleeve matched with the annular embedding groove of the central connecting sleeve, a driving breaking handle arranged along the radial direction of the annular connecting sleeve, and a power driving rod arranged at the free end part of the driving breaking handle and parallel to the axial direction of the rotating shaft.
The outer side surface of the hollow conical friction piece is provided with a rubber friction layer which is mutually abutted with the inner side surface of the conical sleeve of the molten insulating dielectric sample adhering and supporting guide piece, and the inner side surface of the conical sleeve of the molten insulating dielectric sample adhering and supporting guide piece is provided with a friction layer.
The support frame includes that the circumference is arranged the vertical support post in the fixing base outside, per two corresponding settings be equipped with the bracing piece between the vertical support post top, be the cross setting between the bracing piece, be equipped with in the middle of the bracing piece and link up the screw hole of rotation axis, the top of rotation axis sets up rotatory hand wheel.
The fixing seat and the limiting disc are in interference fit.
The upper electrode fluted disc and the plurality of bosses on the top surface of the central connecting sleeve are phenolic laminated paper boards which are made of insulating materials, have good mechanical and insulating properties and high mechanical strength, and cannot influence the electric field distribution near the electrodes in an experiment.
And the rotating shaft is provided with scale marks, so that the thickness of the fused insulating dielectric medium sample arranged between the upper electrode and the lower electrode can be accurately regulated and controlled.
A high-voltage electrode of the high-voltage power supply is connected to the upper electrode binding post through a lead, and the lower electrode binding post is grounded; the lower electrode binding post and the upper electrode binding post are both copper binding posts, so that the electrode binding posts are prevented from being oxidized and rusted in the storage process and being not well contacted with a high-voltage source.
The upper electrode and the lower electrode are copper electrodes, the diameters and the thicknesses of the copper electrodes are the same, the diameters are 25mm, the heights are 5mm, the stress condition of the molten insulating dielectric medium sample under a uniform electric field can be measured, and when the molten insulating dielectric medium sample breaks down, the corrosion resistance of the electrodes can be improved by the copper electrodes.
Realize vertical tensile insulating dielectric electrical property experiment measuring device still include with go up electrode part, the cavity form seal chamber that lower electrode part covers, set up the feed inlet on the cavity form seal chamber, feed inlet department installs the sealing plug, passes through the melting insulating dielectric sample through atmospheric pressure the feed inlet is taken into the melting insulating dielectric sample in the cavity form seal chamber and is adhered to the support guide on, has avoided having the air in cavity form seal chamber, has reduced experimental measurement error.
In order to achieve the above object of the invention, the present invention also provides a method for measuring electrical properties of a longitudinally stretched insulating dielectric, the method comprising the steps of:
the method comprises the following steps: setting an experiment: the hollow conical friction piece of the lower electrode part and the inner side surface of the conical sleeve of the fused insulating dielectric sample adhering and supporting guide part are driven to be mutually abutted along the axial direction of the rotating shaft by manually rotating a rotating hand wheel on the rotating shaft or manually holding a power driving rod of the driving assembly, the lower electrode part is driven to move along the rotating shaft to the upper electrode gear disc by the friction force between the hollow conical friction piece and the conical sleeve, so that the distance between the upper electrode and the lower electrode is automatically adjusted, and the distance is set by the scale mark on the rotating shaft;
step two: putting a sample into a chamber: pumping a molten insulating dielectric sample to be measured onto a molten insulating dielectric sample adhesion supporting guide piece in a hollow sealed cavity in a vacuumizing mode, so that the molten insulating dielectric sample adheres to the supporting guide piece, and standing and cooling;
step three: stretching a sample: rotating a rotating hand wheel on the rotating shaft, or driving a power driving rod of the driving assembly to drive a hollow conical friction piece of a lower electrode part and the inner side surface of a conical sleeve of the molten insulating dielectric medium sample adhering and supporting guide piece to be abutted against each other along the axis direction of the rotating shaft, and driving the lower electrode part to move along the rotating shaft to the upper electrode gear disc through the friction force between the hollow conical friction piece and the conical sleeve, so that the micro-motion of automatically setting the distance between the upper electrode and the lower electrode is realized, and the longitudinal stretching of the molten insulating dielectric medium sample between the upper electrode and the lower electrode is further realized;
step four: voltage application: connecting a high-voltage electrode of the high-voltage power supply to the upper electrode binding post through a lead, grounding the lower electrode binding post, opening a high-voltage power supply switch, starting testing, recording the voltage during breakdown, calculating the breakdown field strength through melting the thickness of the insulating dielectric sample, and recording.
The molten insulating dielectric sample was polyethylene.
The invention has the beneficial effects that: according to the experimental measuring device for realizing the electrical property of the longitudinal tensile insulating dielectric medium, the rotating hand wheel on the rotating shaft is rotated, or the power driving rod of the driving assembly drives the hollow conical friction piece of the lower electrode part to be mutually abutted with the inner side surface of the conical sleeve of the molten insulating dielectric medium sample adhesion supporting guide piece along the axis direction of the rotating shaft, the lower electrode part is driven to move along the rotating shaft to the upper electrode gear disc through the friction force between the hollow conical friction piece and the conical sleeve, so that the adjustment of the distance between the upper electrode and the lower electrode is realized, the tensile thickness of the molten insulating dielectric medium sample is adjusted, and the thickness of the molten insulating dielectric medium sample is changed by adjusting the distance between the upper electrode and the lower electrode; injecting a molten insulating dielectric sample onto a supporting guide member by using the vacuumized air pressure difference, attaching the molten insulating dielectric sample to the supporting guide member to be filled in the circumferences of the upper electrode and the lower electrode which are arranged on the circumference, setting the distance between the upper electrode and the lower electrode in advance, measuring when the molten insulating dielectric sample is cooled to normal temperature, rotating a rotating hand wheel on the rotating shaft, or the power driving rod of the driving assembly drives the hollow conical friction piece of the lower electrode part to abut against the inner side surface of the conical sleeve of the molten insulating dielectric sample adhering and supporting guide piece along the axial direction of the rotating shaft, the lower electrode component is driven to move along the rotating shaft to the upper electrode fluted disc by the friction force between the lower electrode component and the upper electrode fluted disc, further realizing the adjustment of automatically setting the distance between the upper electrode and the lower electrode, and further realizing the breakdown field strength of the sample of the molten insulating dielectric after being stretched; the method realizes the measurement of the original shape of the molten insulating dielectric sample and the breakdown field strength after stretching in the direction of the upper electrode and the lower electrode, breaks through the limitation that the measured molten insulating dielectric sample can only be transversely stretched, realizes the analog measurement of the molten insulating dielectric sample in the stretching and pressure states, and has accurate measurement.
Drawings
Fig. 1 is a schematic overall structure diagram of an embodiment of the present invention.
Fig. 2 is a front view of fig. 1.
Fig. 3 is a schematic structural diagram of a positional relationship among the fixing base, the limiting disc, the rotating shaft, the lower electrode member, the driving assembly, and the rotating handwheel according to the embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a limiting disc, a rotating shaft and a rotating handwheel in the embodiment of the invention.
FIG. 5 is a schematic structural diagram of an upper electrode assembly according to an embodiment of the present invention.
Fig. 6 is a schematic structural view of a molten insulating dielectric sample adhering support guide in an embodiment of the present invention.
Fig. 7 is a schematic structural view of a lower electrode part in an embodiment of the present invention.
Fig. 8 is a schematic structural diagram illustrating a positional relationship between the supporting frame and the fixing base in the embodiment of the present invention.
Fig. 9 is a schematic structural diagram of a driving assembly according to an embodiment of the invention.
Wherein the reference numerals are: 1. a support frame; 2. a fixed seat; 3. a limiting disc; 4. a rotating shaft;
5. an upper electrode part; 50. an upper electrode fluted disc; 51. a guide sleeve; 52. a butt strap; 53. melting the insulating dielectric sample adhering support guide;
6. a lower electrode part; 60. a central connecting sleeve; 61. connecting ribs; 62. a hollow conical friction member;
7. a drive assembly; 70. an annular connecting sleeve; 71. driving the breaking handle; 72. a power drive shaft;
8. the hand wheel is rotated.
Detailed Description
In order to clearly illustrate the technical features of the present invention, the following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented.
Referring to fig. 1 to 9, an embodiment of the present invention provides an apparatus for implementing electrical performance experiment measurement of a longitudinally stretched insulating dielectric, specifically: the utility model provides a realize vertical tensile insulating dielectric electrical property experiment measuring device, includes high voltage power supply, support frame 1, sets up fixing base 2 on support frame 1, sets up rather than the spacing dish 3 of complex from fixing base 2 below, wherein, respectively with support frame 1, 3 threaded connection's of spacing dish rotation axis 4, be located spacing dish 3 below, the last electrode part 5 that is connected with rotation axis 4 in proper order, lower electrode part 6 plays drive assembly 7 of lower electrode part 6.
Go up electrode part 5 and include the last electrode fluted disc 50 with spacing 3 bottom surface annular inner circular tooth groove looks lock, set up the uide bushing 51 at last electrode fluted disc 50 center department, with uide bushing 51 and last electrode fluted disc 50 interconnect, and the strap 52 of circumference arrangement, seted up the slot on the strap 52, a plurality of slots are seted up to uide bushing 51 bottom surface circumference equidistant, set up the electrode terminal in the notch, every go up the electrode terminal on connect an upper electrode.
The upper electrode part 5 further comprises a fused insulating dielectric sample attaching and supporting guide piece 53 which is mutually inserted into the slot on the butt strap 52, the fused insulating dielectric sample attaching and supporting guide piece 53 consists of a conical sleeve, an annular guide sleeve connected onto the conical sleeve and elastic supporting elements arranged on the top surface of the annular guide sleeve at equal intervals on the circumference, and the elastic supporting elements comprise guide rods connected to the top surface of the annular guide sleeve at equal intervals and pressure springs sleeved on the guide rods.
The molten insulating dielectric sample adhering and supporting guide 53 is filled in the circumference of the upper electrode and the lower electrode which are circumferentially arranged.
The lower electrode part 6 comprises a central connecting sleeve 60 connected to the rotating shaft 4, a plurality of connecting ribs 61 arranged outside the central connecting sleeve 60 at equal intervals on the circumference, a hollow conical friction piece 62 arranged at the free end part of each connecting rib 61 and concentrically arranged with the central connecting sleeve 60, and a plurality of bosses arranged on the top surface of the central connecting sleeve 60 at equal intervals, wherein each boss is provided with a lower electrode binding post, and each lower electrode binding post is connected with a lower electrode.
The upper electrode part 5 and the lower electrode part 6 are respectively in threaded connection with the rotating shaft 4, the hollow conical friction part 62 of the lower electrode part 6 is driven to be in contact with the inner side surface of the conical sleeve of the molten insulating dielectric sample adhering and supporting guide 53 by rotating the rotating hand wheel 8 at the top of the rotating shaft 4 or the power driving rod 72 of the handheld driving assembly 7 along the axial direction of the rotating shaft 4, the lower electrode part 6 is driven to move to the upper electrode fluted disc 50 along the rotating shaft 4 by the friction force between the hollow conical friction part and the conical sleeve, and the distance between the upper electrode and the lower electrode, namely the thickness of the measured molten insulating dielectric sample, is automatically adjusted.
The driving assembly 7 is composed of an annular coupling sleeve 70 fitted with the annular fitting groove of the center coupling sleeve 60, a driving breaking-off handle 71 provided in a radial direction of the annular coupling sleeve 70, and a power driving rod 72 provided at a free end portion of the driving breaking-off handle 71 and arranged in parallel with an axial direction of the rotary shaft 4.
The outer side surface of the hollow conical friction member 62 is provided with a rubber friction layer which is in contact with the inner side surface of the conical sleeve of the molten insulating dielectric sample adhesion support guide 53, and the inner side surface of the conical sleeve of the molten insulating dielectric sample adhesion support guide 53 is provided with a friction layer.
The support frame 1 comprises vertical support columns arranged on the outer side of the fixing base 2 in a circumferential mode, support rods are arranged between the tops of every two corresponding vertical support columns, the support rods are arranged in a cross mode, threaded holes penetrating through the rotating shaft 4 are formed in the middle of the support rods, and the top of the rotating shaft 4 is provided with a rotating hand wheel 8.
The fixed seat 2 is in interference fit with the limiting disc 3.
The upper electrode fluted disc 50 and the plurality of bosses on the top surface of the central connecting sleeve 60 are phenolic laminated paperboards which are made of insulating materials, have good mechanical and insulating properties and high mechanical strength, and cannot influence the electric field distribution near the electrodes in an experiment.
The rotating shaft 4 is provided with scale marks, so that the thickness of the molten insulating dielectric medium sample between the upper electrode and the lower electrode can be accurately regulated and controlled.
A high-voltage electrode of a high-voltage power supply is connected with an upper electrode binding post through a lead, and a lower electrode binding post is grounded; the lower electrode binding post and the upper electrode binding post are both copper binding posts, so that the electrode binding posts are prevented from being oxidized and rusted in the storage process and being not well contacted with a high-voltage source.
The upper electrode and the lower electrode are copper electrodes, the diameters and the thicknesses of the copper electrodes are the same, the diameters are 25mm, the heights are 5mm, the stress condition of the molten insulating dielectric medium sample under a uniform electric field can be measured, and when the molten insulating dielectric medium sample breaks down, the corrosion resistance of the electrodes can be improved by the copper electrodes.
The experimental measurement device for realizing the electrical property of the longitudinally stretched insulating dielectric medium further comprises a hollow sealing cavity covered by the upper electrode part 5 and the lower electrode part 6, a feed inlet is formed in the hollow sealing cavity, a sealing plug is installed at the feed inlet, and a molten insulating dielectric medium sample is pumped into the hollow sealing cavity through the feed inlet by air pressure to adhere to the supporting guide piece 53, so that the existence of air in the hollow sealing cavity is avoided, and the experimental measurement error is reduced.
In order to achieve the above object, the present invention further provides a method for measuring electrical properties of a longitudinally stretched insulating dielectric, the method comprising the steps of:
the method comprises the following steps: setting an experiment: the hollow conical friction piece 62 of the lower electrode part 6 is driven to be mutually abutted with the inner side surface of the conical sleeve of the molten insulating dielectric sample adhering and supporting guide 53 by manually rotating the rotating hand wheel 8 on the rotating shaft 4 or the power driving rod 72 of the manual driving assembly 7 along the axial direction of the rotating shaft 4, the lower electrode part 6 is driven to move to the upper electrode fluted disc 50 along the rotating shaft 4 by the friction force between the hollow conical friction piece 62 and the conical sleeve, so that the distance between the upper electrode and the lower electrode is automatically adjusted, and the setting is carried out by the scale marks on the rotating shaft 4;
step two: putting a sample into a chamber: pumping a molten insulating dielectric sample to be measured onto the molten insulating dielectric sample adhesion support guide 53 in the hollow sealed cavity in a vacuum pumping mode, so that the molten insulating dielectric sample adheres to the support guide 53, and standing and cooling;
step three: stretching a sample: rotating a rotating hand wheel 8 on the rotating shaft 4, or driving a power driving rod 72 of the driving assembly 7 to drive the hollow conical friction piece 62 of the lower electrode part 6 and the inner side surface of the conical sleeve of the molten insulating dielectric sample adhesion supporting guide 53 to be abutted against each other along the axial direction of the rotating shaft 4, and driving the lower electrode part 6 to move to the upper electrode fluted disc 50 along the rotating shaft 4 through the friction force between the hollow conical friction piece 62 and the conical sleeve, so that the micro-motion of automatically adjusting the distance between the upper electrode and the lower electrode is realized, and the longitudinal stretching of the molten insulating dielectric sample between the upper electrode and the lower electrode is further realized;
step four: voltage application: connecting a high-voltage electrode of a high-voltage power supply to an upper electrode binding post through a lead, grounding a lower electrode binding post, starting a test by opening a high-voltage power supply switch, recording the voltage during breakdown, calculating the breakdown field intensity by melting the thickness of an insulating dielectric sample, and recording.
The molten insulating dielectric sample was polyethylene.
In actual use, the invention comprises the following steps: the hollow conical friction piece 62 of the lower electrode part 6 is driven by a rotating hand wheel 8 on the rotating shaft 4 or a power driving rod 72 of a driving assembly 7 to be abutted against the inner side surface of the conical sleeve of the molten insulating dielectric sample adhering and supporting guide 53 along the axial direction of the rotating shaft 4, the lower electrode part 6 is driven to move to the upper electrode fluted disc 50 along the rotating shaft 4 by the friction force between the hollow conical friction piece 62 and the conical sleeve, so that the distance between the upper electrode and the lower electrode is automatically adjusted, the stretching thickness of the molten insulating dielectric sample is adjusted, and the thickness of the molten insulating dielectric sample is changed by adjusting the distance between the upper electrode and the lower electrode; injecting a molten insulating dielectric sample onto a supporting guide 53 by using the vacuumized air pressure difference, attaching the molten insulating dielectric sample to the supporting guide 53 and filling the molten insulating dielectric sample into the circumferences of an upper electrode and a lower electrode which are arranged on the circumference, wherein the distance between the upper electrode and the lower electrode is preset, measuring the molten insulating dielectric sample after the molten insulating dielectric sample is cooled to the normal temperature, rotating a hand wheel 8 on a rotating shaft 4, or the power driving rod 72 of the driving unit 7 drives the hollow tapered friction member 62 of the lower electrode part 6 and the inner side surface of the tapered sleeve of the molten insulating dielectric sample adhesion supporting guide 53 in the axial direction of the rotary shaft 4 to abut against each other, the lower electrode part 6 is driven to move to the upper electrode fluted disc 50 along the rotating shaft 4 by the friction force between the lower electrode part and the upper electrode fluted disc, further realizing the adjustment of automatically setting the distance between the upper electrode and the lower electrode, and further realizing the breakdown field strength of the sample of the molten insulating dielectric after being stretched; the measurement of the breakdown field strength of the molten insulating dielectric sample in the direction of the upper electrode and the lower electrode after the sample is stretched is realized.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A longitudinal stretching insulating dielectric electrical property measuring device comprises a high-voltage power supply, a support frame (1), a fixed seat (2) arranged on the support frame (1), and a limit disc (3) matched with the fixed seat (2) from the lower part, and is characterized in that a rotating shaft (4) in threaded connection with the support frame (1) and the limit disc (3) respectively, an upper electrode part (5) and a lower electrode part (6) which are positioned below the limit disc (3) and are sequentially connected with the rotating shaft (4), and a driving assembly (7) for driving the lower electrode part (6);
the electrical property measuring device of the longitudinally stretched insulating dielectric further comprises a hollow sealing cavity which covers the upper electrode part (5) and the lower electrode part (6), a feed port is arranged on the hollow sealing cavity, and a sealing plug is arranged at the feed port;
the upper electrode part (5) comprises an upper electrode fluted disc (50) buckled with an annular inner fluted disc on the bottom surface of the limiting disc (3), a guide sleeve (51) arranged at the center of the upper electrode fluted disc (50), a plurality of notches are formed in the circumference of the bottom surface of the guide sleeve (51) at equal intervals, upper electrode binding posts are arranged in the notches, and each upper electrode binding post is connected with an upper electrode;
the upper electrode part (5) further comprises a fused insulating dielectric sample attaching and supporting guide piece (53) which is mutually inserted into the slot on the butt strap (52), the fused insulating dielectric sample attaching and supporting guide piece (53) consists of a conical sleeve, an annular guide sleeve connected onto the conical sleeve and elastic supporting elements arranged on the top surface of the annular guide sleeve at equal intervals on the circumference, and the elastic supporting elements comprise guide rods connected onto the top surface of the annular guide sleeve at equal intervals and compression springs sleeved on the guide rods;
the lower electrode part (6) comprises a central connecting sleeve (60) connected to the rotating shaft (4), a plurality of connecting ribs (61) arranged on the outer side of the central connecting sleeve (60) at equal intervals on the circumference, hollow conical friction pieces (62) arranged at the free end parts of the connecting ribs (61) and concentrically arranged with the central connecting sleeve (60), and a plurality of bosses arranged on the top surface of the central connecting sleeve (60) at equal intervals, a lower electrode binding post is arranged on each boss, and each lower electrode binding post is connected with a lower electrode;
the upper electrode part (5) and the lower electrode part (6) are respectively in threaded connection with the rotating shaft 4;
the driving assembly (7) is composed of an annular connecting sleeve (70) matched with the annular embedding groove of the central connecting sleeve (60), a driving breaking handle (71) arranged along the radial direction of the annular connecting sleeve (70), and a power driving rod (72) which is arranged at the free end part of the driving breaking handle (71) and is parallel to the axial direction of the rotating shaft (4).
2. The device for measuring electrical properties of longitudinally stretched insulating dielectric according to claim 1, characterized in that the outer side of the hollow conical friction member (62) is provided with a rubber friction layer abutting against the inner side of the conical sleeve of the sample adhesion supporting guide (53), and the inner side of the conical sleeve of the sample adhesion supporting guide (53) is provided with a friction layer.
3. The device for measuring the electrical property of the longitudinally stretched insulating dielectric according to claim 2, wherein the supporting frame (1) comprises vertical supporting columns circumferentially arranged on the outer side of the fixed base (2), supporting rods are arranged between the tops of every two correspondingly arranged vertical supporting columns, the supporting rods are arranged in a cross manner, threaded holes penetrating through the rotating shaft (4) are formed in the middles of the supporting rods, and a rotating hand wheel (8) is arranged at the top of the rotating shaft (4).
4. A device for measuring electrical properties of a longitudinally stretched insulating dielectric according to claim 3, characterized in that the holder (2) is in interference fit with the limiting disc (3).
5. A method of measuring electrical properties of a longitudinally stretched insulating dielectric using the apparatus for measuring electrical properties of a longitudinally stretched insulating dielectric according to claim 4, the method comprising the steps of:
the method comprises the following steps: setting an experiment: a rotating hand wheel (8) on a rotating shaft (4) is manually rotated, or a power driving rod (72) of a driving assembly (7) is manually held to drive a hollow conical friction piece (62) of the lower electrode part (6) to be in contact with the inner side face of a conical sleeve of the molten insulating dielectric sample adhering and supporting guide piece (53) along the axial direction of the rotating shaft (4), the lower electrode part (6) is driven to move towards the upper electrode fluted disc (50) along the rotating shaft (4) through the friction force between the hollow conical friction piece and the conical sleeve, the distance between the upper electrode and the lower electrode is automatically adjusted, and the distance is set through a scale mark on the rotating shaft (4);
step two: putting a sample into a chamber: pumping a molten insulating dielectric sample to be measured onto a molten insulating dielectric sample adhesion supporting guide (53) in the hollow sealed cavity in a vacuum pumping mode, so that the molten insulating dielectric sample is adhered onto the supporting guide (53), and standing and cooling;
step three: stretching a sample: rotating a rotating hand wheel (8) on the rotating shaft (4), or driving a power driving rod (72) of the driving assembly (7) to drive a hollow conical friction piece (62) of the lower electrode part (6) to be in contact with the inner side surface of a conical sleeve of the molten insulating dielectric sample adhesion supporting guide piece (53) along the axis direction of the rotating shaft (4), and driving the lower electrode part (6) to move to the upper electrode fluted disc (50) along the rotating shaft (4) through the friction force between the hollow conical friction piece and the conical sleeve, so that the micro-motion of automatically adjusting the distance between the upper electrode and the lower electrode is realized, and the longitudinal stretching of the molten insulating dielectric sample between the upper electrode and the lower electrode is further realized;
step four: voltage application: connecting a high-voltage electrode of the high-voltage power supply to the upper electrode binding post through a lead, grounding the lower electrode binding post, opening a high-voltage power supply switch, starting testing, recording the voltage during breakdown, calculating the breakdown field strength through melting the thickness of the insulating dielectric sample, and recording.
6. The method of measuring a device for measuring electrical properties of a longitudinally stretched insulating dielectric according to claim 5, wherein the sample of molten insulating dielectric is polyethylene.
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| CN201810430547.3A CN108594091B (en) | 2018-05-08 | 2018-05-08 | Electrical performance measuring device and method for longitudinally-stretched insulating dielectric medium |
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| CN201810430547.3A CN108594091B (en) | 2018-05-08 | 2018-05-08 | Electrical performance measuring device and method for longitudinally-stretched insulating dielectric medium |
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| CN108594091B true CN108594091B (en) | 2020-09-29 |
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| CN111077423B (en) * | 2020-01-07 | 2021-03-05 | 浙江大学 | Device and method for testing dielectric property of solid insulating material interface |
| CN111413544A (en) * | 2020-03-26 | 2020-07-14 | 天津大学 | Method for judging influence of mechanical stretching on nonlinear conductivity of composite material |
| CN113075505B (en) * | 2021-03-25 | 2022-08-02 | 哈尔滨理工大学 | Insulating material electric-heat combined aging test device |
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