CN114509653A - Experimental device for use XLPE cable to cultivate electricity branch - Google Patents
Experimental device for use XLPE cable to cultivate electricity branch Download PDFInfo
- Publication number
- CN114509653A CN114509653A CN202111476497.0A CN202111476497A CN114509653A CN 114509653 A CN114509653 A CN 114509653A CN 202111476497 A CN202111476497 A CN 202111476497A CN 114509653 A CN114509653 A CN 114509653A
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- China
- Prior art keywords
- xlpe
- copper plate
- xlpe cable
- needle
- cable
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Links
- 229920003020 cross-linked polyethylene Polymers 0.000 title claims abstract description 54
- 239000004703 cross-linked polyethylene Substances 0.000 title claims abstract description 54
- 230000005611 electricity Effects 0.000 title description 2
- 238000012360 testing method Methods 0.000 claims abstract description 33
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052802 copper Inorganic materials 0.000 claims abstract description 25
- 239000010949 copper Substances 0.000 claims abstract description 25
- 230000001105 regulatory effect Effects 0.000 claims abstract description 15
- 239000011521 glass Substances 0.000 claims abstract description 7
- 239000003063 flame retardant Substances 0.000 claims abstract description 5
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 4
- 230000000717 retained effect Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 238000002474 experimental method Methods 0.000 abstract description 11
- 230000032683 aging Effects 0.000 abstract description 8
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052721 tungsten Inorganic materials 0.000 abstract description 3
- 239000010937 tungsten Substances 0.000 abstract description 3
- 239000012774 insulation material Substances 0.000 abstract description 2
- 238000004643 material aging Methods 0.000 abstract description 2
- 238000011160 research Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Images
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
- G01R31/16—Construction of testing vessels; Electrodes therefor
-
- 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
- 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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses an experimental device for cultivating an electric tree by applying an XLPE cable, which belongs to the technical field of insulation material aging experiments and comprises an alternating current voltage regulating source, a switch, a rectifying circuit, an inverter circuit, a protection device, a transformer, a copper plate, a pin electrode, a test groove, insulating oil and an XLPE cable sample; the alternating current voltage regulating source, the switch, the rectifying circuit, the inverter circuit, the protection device, the transformer, the copper plate and the pin electrode are electrically connected in sequence; the test groove is an organic glass test groove; the insulating oil is contained in the test groove; the needle electrode is made of tungsten wires, and the curvature radius of the needle point is 2.5 +/-0.5 mu m; 14 needle electrodes with the same length are fixed on the copper plate; the XLPE cable sample is a 1m long single-core crosslinked polyethylene cable, the outer sheath, the flame-retardant layer and the copper shielding layer of the XLPE cable sample are stripped, the outer semi-conducting layers at two ends are stripped by 10cm, and a 2cm long wire core is exposed at the end; the experimental device can realize the aging research of the power tree under different frequencies and different voltage levels, and has simple structure and easy operation.
Description
Technical Field
The invention belongs to the technical field of insulation material aging experiments, and particularly relates to an experimental device for cultivating electric branches by applying XLPE cables.
Background
The aging of the power tree is an important form of the aging of the cable insulation, the power tree can reduce the insulation margin of the cable, the service life of the cable is further shortened, and the cable insulation breakdown can be caused under certain conditions. This will seriously affect the operation of the power grid and cause power failure accidents. Therefore, the method has extremely important significance for researching the aging of the cable insulation tree.
During the manufacturing, transportation, laying and putting into use of the cable, certain damage to the insulating layer is inevitably caused, so that the insulating layer of the cable has some tiny defects, and the tiny defects can develop into electrical tree branches when being subjected to lightning or operation overvoltage. The existing method for researching the growth of the electric tree generally adopts a needle plate electrode method to simulate the generating condition of the electric tree. In the method, XLPE is manufactured into a sheet with the thickness of 2 +/-1 mm, and a tungsten needle is inserted into the XLPE sheet from the side. The method cannot completely simulate the real growth environment and growth condition of the cable in the actual operation process.
Therefore, there is a need in the art for a new solution to solve this problem.
Disclosure of Invention
In order to overcome the defects in the prior art: the invention provides an experimental device for cultivating electric branches by applying XLPE cables, which is used for researching the aging problem of the electric branches in an insulating layer of the cable in the normal service process in a laboratory.
In order to achieve the purpose, the invention adopts the technical scheme that: an experimental device for cultivating an electric tree by applying an XLPE cable comprises an alternating-current voltage regulating source, a switch, a rectifying circuit, an inverter circuit, a protection device, a transformer, a copper plate, a pin electrode, a test groove, insulating oil and an XLPE cable sample; the alternating current voltage regulating source, the switch, the rectifying circuit, the inverter circuit, the protection device, the transformer, the copper plate and the pin electrode are electrically connected in sequence; the test groove is an organic glass test groove; the insulating oil is contained in the test groove;
the needle electrode is made of tungsten wires, and the curvature radius of the needle point is 2.5 +/-0.5 mu m;
14 needle electrodes with the same length are fixed on the copper plate;
the XLPE cable sample is a 1m long single-core crosslinked polyethylene cable; the oversheath, fire-retardant layer and copper shield layer are peeled off to the XLPE cable sample, peels off 10cm with the outer semi-conducting layer at both ends in order to prevent that creepage phenomenon from taking place, and end department exposes 2cm long core.
Through the design scheme, the invention can bring the following beneficial effects:
1. the method can realize the aging research of the power tree under different frequencies and different voltage levels. And the testing device has simple structure and is easy to operate.
2. The time required for the electrical tree to grow can be shortened by varying the frequency and voltage levels.
And 3, the XLPE cable sample is placed in a test groove filled with insulating oil, so that the discharge phenomenon can be effectively prevented, and the potential safety hazard is reduced.
Drawings
FIG. 1 is a schematic structural diagram of an experimental device for cultivating electric tree branches by applying XLPE cables.
FIG. 2 is a schematic structural diagram of an XLPE cable sample of an experimental apparatus for cultivating electric tree branches by applying the XLPE cable.
FIG. 3 is a schematic view of an assembly section of an experimental apparatus for cultivating electric tree branches by applying XLPE cable according to the present invention.
FIG. 4 is a schematic axial structure diagram of an XLPE cable of an experimental device for cultivating electric tree branches by applying the XLPE cable.
FIG. 5 is a schematic view of a radial structure of an XLPE cable of an experimental apparatus for cultivating electric tree branches by applying the XLPE cable.
In the figure, 1-an alternating current voltage regulating source, 2-a switch, 3-a rectifying circuit, 4-an inverter circuit, 5-a protection device, 6-a transformer, 7-a copper plate, 8-a pin electrode, 9-a test groove, 10-insulating oil and 11-XLPE cable samples.
Detailed Description
The following detailed description of the embodiments of the invention is provided in connection with the accompanying drawings
It should be noted that, the terms "front and back, up and down, left and right" and the like in the text are only simplified terms for visually describing the positional relationship based on the drawings, and do not limit the technical solution.
Shown in attached figures 1-5: an experimental device for cultivating an electric tree by applying an XLPE cable comprises an alternating current voltage regulating source 1, a switch 2, a rectifying circuit 3, an inverter circuit 4, a protection device 5, a transformer 6, a copper plate 7, a pin electrode 8, a test groove 9, insulating oil 10 and an XLPE cable sample 11; the alternating current voltage regulating source 1, the switch 2, the rectifying circuit 3, the inverter circuit 4, the protection device 5, the transformer 6, the copper plate 7 and the pin electrode 8 are electrically connected in sequence; the test groove 9 is an organic glass test groove; the insulating oil 10 is contained in the test tank 9;
14 needle electrodes 8 are fixed on the copper plate 7, the lengths of the 14 needle electrodes 8 are the same, the curvature radius of a needle point is 2.5 +/-0.5 mu m, and the needle point points to deviate from the copper plate;
the test tank 9 is made of organic glass, the insulating oil 10 is contained in the test tank 9, and after the XLPE cable sample 11 is placed in the test tank 9, the insulating oil 10 can immerse the XLPE cable sample 11.
The XLPE cable sample 11 only retained the outer semiconductive layer 111, XLPE layer 112, inner semiconductive layer 113 and wire core 114.
The invention realizes the growth of the electric tree under a certain frequency and a certain voltage level through the alternating current voltage regulating power supply unit, the switch unit, the rectification unit, the inversion unit, the protection unit, the transformer unit and the test tank unit. Meanwhile, by increasing the voltage level and frequency, the time required by the growth of the electric tree can be shortened. The alternating current voltage regulating source 1 has the advantages of adjustable output voltage, stability, no distortion, reliability in operation and the like, and provides voltage for the whole set of experimental device. The switch 2 can control the on-off of the whole circuit. The rectifying circuit 3 converts alternating current voltage provided by the voltage regulating source into direct current. The inverter circuit 4 can realize frequency adjustment and convert a direct current voltage into an alternating current voltage. The protection device 5 can detect the inverted output current, and when the detected inverted output current exceeds a specified value, the switch 2 is switched off. The transformer 6 can transform low voltage into high voltage to be transmitted to the copper plate 7 under the condition of keeping the frequency unchanged. The copper plate 7 transmits high voltage to 14 needle electrodes 8 to provide high voltage for the electric tree growth experiment. The test groove 9 is used as a vessel for containing insulating oil 10 and an XLPE cable sample 11, and a wire core of the XLPE cable sample 11 is grounded as a ground level.
In a specific implementation, the XLPE cable sample 11 is a YJV-8.7/15kV single-core crosslinked polyethylene insulated cable. The structure of the cable comprises an outer sheath 115, a flame-retardant layer 116, a copper shielding layer 117, an outer semi-conducting layer 111, an XLPE layer 112, an inner semi-conducting layer 113 and a cable core 114. During the test, the cable is cut into 1m long cables, the outer sheath 115, the flame retardant layer 116 and the copper shielding layer 117 are stripped, the outer semi-conducting layers 111 at two ends are stripped by 10cm to prevent the creepage phenomenon, and the 2cm long wire core 114 is exposed at the end.
The voltage required by the experiment is obtained by calculating the transformation ratio of the transformer 6 and the input of the alternating current voltage regulating source 1; the frequency required for the experiment is written by the program of the inverter circuit 4.
In the preparation stage, the equipment required by the experiment, such as an alternating current voltage regulating source 1, a switch 2, a rectifying circuit 3, an inverter circuit integrated module 4, a protection device 5, a transformer 6, a copper plate 7, a pin electrode 8, a test groove 9 and the like, and insulating oil 10 and an XLPE cable sample 11 required by the experiment are prepared.
And in the calculation stage, the voltage required by the experiment is determined: the voltage required to be provided by the alternating current voltage regulating source 1 can be calculated according to the transformation ratio of the transformer 6; the frequency required by the experiment is determined by the inverter circuit 4, and can be written into the inverter circuit 4 by the DSP program.
Connecting prepared devices according to a structural schematic diagram shown in fig. 1, setting a calculated voltage by the alternating current voltage regulator 1, and setting a frequency required by an experiment by the inverter circuit 4; the groove body of the test groove 9 is made of organic glass, and insulating oil 10 is filled in the groove and used for preventing creeping discharge; fixing 14 needle electrodes 8 on the copper plate 7, then vertically inserting the needle electrodes 8 into the XLPE layer 112 from the outer semi-conducting layer 111, and enabling the needle points to stay at a position 2mm away from the outer layer of the inner semi-conducting layer 113; putting an XLPE cable sample 11 inserted with the needle electrode 8 into a test groove 9; the copper plate 7 is connected with the secondary side output of the transformer 6 through a lead to form a high-voltage electrode required by an experiment, and a wire core 114 of the XLPE cable sample 11 is grounded.
The XLPE cable sample 11 in the test groove 9 can realize the electric tree aging under high-frequency high voltage, high-frequency low voltage, low-frequency low voltage or low-frequency high voltage. The aging period of the power tree is generally unequal within 30-150min, and the higher the voltage grade is, the higher the frequency is, the shorter the time required for the power tree to age to the same degree is.
It is to be understood that the above-described embodiments are only some, and not all, embodiments of the present invention. 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.
Claims (6)
1. The utility model provides an use experimental apparatus that XLPE cable cultivated electric branch which characterized in that: the device comprises an alternating current voltage regulating source (1), a switch (2), a rectifying circuit (3), an inverter circuit (4), a protection device (5), a transformer (6), a copper plate (7), a pin electrode (8), a test groove (9), insulating oil (10) and an XLPE cable test sample (11); the alternating current voltage regulating source (1), the switch (2), the rectifying circuit (3), the inverter circuit (4), the protection device (5), the transformer (6), the copper plate (7) and the needle electrode (8) are electrically connected in sequence; the test groove (9) is an organic glass test groove; the insulating oil (10) is contained in the test tank (9);
the copper plate (7) is fixedly provided with 14 needle electrodes (8), the 14 needle electrodes (8) are the same in length, and the needle points point away from the copper plate (7);
the XLPE cable sample (11) only retained the outer semiconductive layer (111), XLPE layer (112), inner semiconductive layer (113) and wire core (114).
2. The experimental device for cultivating electric tree branches by applying XLPE cables is characterized in that: the curvature radius of the needle point of the needle electrode (8) is 2.5 +/-0.5 mu m.
3. The experimental device for cultivating electric tree branches by applying XLPE cables is characterized in that: the test groove (9) is made of organic glass material.
4. The experimental device for cultivating electric tree branches by applying XLPE cables is characterized in that: the insulating oil (10) is transformer insulating oil.
5. The experimental device for cultivating electric tree branches by applying XLPE cables is characterized in that: the XLPE cable test sample (11) adopts a YJV-8.7/15kV single-core cross-linked polyethylene insulated cable, the length of the XLPE cable test sample (11) is 1m, an outer sheath (115), a flame-retardant layer (116) and a copper shielding layer (117) are stripped, the outer semi-conductive layers (111) at two ends are stripped by 10cm, and a 2cm long wire core (114) is exposed at the end.
6. The experimental device for cultivating electric tree branches by applying XLPE cables is characterized in that: the protection device (5) is used for detecting the inversion output current of the inversion circuit (4), and the switch (2) can be switched off when the detected current exceeds a specified value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111476497.0A CN114509653A (en) | 2021-12-06 | 2021-12-06 | Experimental device for use XLPE cable to cultivate electricity branch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111476497.0A CN114509653A (en) | 2021-12-06 | 2021-12-06 | Experimental device for use XLPE cable to cultivate electricity branch |
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| Publication Number | Publication Date |
|---|---|
| CN114509653A true CN114509653A (en) | 2022-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111476497.0A Pending CN114509653A (en) | 2021-12-06 | 2021-12-06 | Experimental device for use XLPE cable to cultivate electricity branch |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106290366A (en) * | 2016-08-08 | 2017-01-04 | 哈尔滨理工大学 | A kind of real-time observation device causing experiment for electric branch |
| CN108710068A (en) * | 2018-06-26 | 2018-10-26 | 广西电网有限责任公司电力科学研究院 | A kind of XLPE cable water tree accelerated aging tester and sample production method |
| CN109001599A (en) * | 2018-07-05 | 2018-12-14 | 天津大学 | Direct current cables insulating materials high temperature ageing degree assessment method based on Composite Field |
| CN111665425A (en) * | 2020-07-09 | 2020-09-15 | 国网山西省电力公司电力科学研究院 | Device and method for rapidly detecting tree resistance of crosslinked polyethylene cable |
| CN113092969A (en) * | 2021-04-13 | 2021-07-09 | 哈尔滨理工大学 | XLPE insulating material water tree growth experimental apparatus |
| CN216595381U (en) * | 2021-12-06 | 2022-05-24 | 哈尔滨理工大学 | Experimental device for use XLPE cable to cultivate electricity branch |
-
2021
- 2021-12-06 CN CN202111476497.0A patent/CN114509653A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106290366A (en) * | 2016-08-08 | 2017-01-04 | 哈尔滨理工大学 | A kind of real-time observation device causing experiment for electric branch |
| CN108710068A (en) * | 2018-06-26 | 2018-10-26 | 广西电网有限责任公司电力科学研究院 | A kind of XLPE cable water tree accelerated aging tester and sample production method |
| CN109001599A (en) * | 2018-07-05 | 2018-12-14 | 天津大学 | Direct current cables insulating materials high temperature ageing degree assessment method based on Composite Field |
| CN111665425A (en) * | 2020-07-09 | 2020-09-15 | 国网山西省电力公司电力科学研究院 | Device and method for rapidly detecting tree resistance of crosslinked polyethylene cable |
| CN113092969A (en) * | 2021-04-13 | 2021-07-09 | 哈尔滨理工大学 | XLPE insulating material water tree growth experimental apparatus |
| CN216595381U (en) * | 2021-12-06 | 2022-05-24 | 哈尔滨理工大学 | Experimental device for use XLPE cable to cultivate electricity branch |
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