CN110726910A - Medium-high voltage power cable terminal moisture intrusion detection device - Google Patents
Medium-high voltage power cable terminal moisture intrusion detection device Download PDFInfo
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- CN110726910A CN110726910A CN201911063263.6A CN201911063263A CN110726910A CN 110726910 A CN110726910 A CN 110726910A CN 201911063263 A CN201911063263 A CN 201911063263A CN 110726910 A CN110726910 A CN 110726910A
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- aluminum alloy
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- 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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- General Physics & Mathematics (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Cable Accessories (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a middle-high voltage power cable terminal moisture intrusion detection device, which comprises a double-leaf aluminum alloy shell with an openable and closable symmetrical structure, wherein the left end of the aluminum alloy shell is provided with a left end upper screw, a left end head screw and a left end lower screw which are used for fastening a waterproof sheath, and the right end of the aluminum alloy shell is provided with a right end upper screw and a right end lower screw which are used for fastening a metal end; the device also comprises a plurality of hygrometers which are uniformly arranged on the upper part and the lower part of the inner wall of the aluminum alloy shell, and the hygrometers are connected to a computer; the low-voltage test wire of the dielectric spectrum test device is also connected to the terminal grounding terminal, and the high-voltage test end is used for connecting the copper cable core of the cable terminal to be detected. The invention has the beneficial effects that the rapid test is carried out when the moisture invasion phenomenon occurs at the high-voltage power cable terminal in the power system, and the invention has important significance for ensuring the operation reliability of the power cable.
Description
Technical Field
The invention relates to the field of cable terminal fault evaluation, in particular to a medium-high voltage power cable terminal moisture intrusion detection device.
Background
With the continuous expansion of modern city functions, the power cable is used as a power energy transmission facility with excellent electrical and mechanical properties and is widely applied. In recent years, crosslinked polyethylene cables are the most important application choice in urban construction, and because the insulation of the crosslinked polyethylene cables is the whole formed by extrusion molding, the crosslinked polyethylene cables are favored by users with waterproof and moisture-proof performances at the beginning of investment, the crosslinked polyethylene cables are popularized vigorously and replace original lines on a large scale, people often ignore the moisture intrusion prevention work on the crosslinked polyethylene cables, and the crosslinked polyethylene cables are soaked in urban ponding water for operation on a large scale. With the extension of the operation time, the crosslinked polyethylene cable and the terminal are gradually affected with damp due to the invasion of moisture, after the crosslinked polyethylene cable and the terminal are corroded by the moisture, a series of physical and chemical actions are generated under the action of a strong electric field, and the phenomenon of 'water tree' is more and more serious in the insulation along the direction of the electric field, so that the breakdown accident of the cable insulation is caused. In addition, the intrusion of moisture causes serious corrosion of the shielding layer, and also causes concentration of an electric field of the cable and the terminal insulation, thereby increasing contact resistance, generating heat seriously and causing rapid reduction of the cable insulation performance.
At present, the detection device for detecting the moisture invasion of the power cable terminal laid in the cable trench is still deficient, the detection devices applied in a large number on site are not directed to the moisture invasion fault at present, the detection effect is very poor, and the main research does not pay attention to the problem, so that great trouble is caused to the safe and reliable operation of the high-voltage cable in the city at present.
Disclosure of Invention
The invention aims to provide a device for detecting moisture intrusion at a medium-high voltage power cable terminal.
The technical scheme for realizing the purpose of the invention is as follows:
the middle-high voltage power cable terminal moisture intrusion detection device comprises an aluminum alloy shell (4), wherein the aluminum alloy shell (4) is of a double-leaf symmetrical structure capable of being opened and closed, a left end upper screw (5), a left end head screw (6) and a left end lower screw (7) for fastening a waterproof sheath (8) are arranged at the left end, a right end upper screw (13) and a right end lower screw (16) for fastening a metal end head (17) are arranged at the right end, the waterproof sheath (8) is used for sleeving a cable terminal to be detected, and the metal end head (17) is used for sleeving the end head of the cable terminal to be detected; the device also comprises a No. 1 hygrometer (9), a No. 2 hygrometer (10) and a No. 3 hygrometer (11) which are uniformly arranged on the upper part of the inner wall of the aluminum alloy shell (4), and a No. 4 hygrometer (21), a No. 5 hygrometer (20) and a No. 6 hygrometer (19) which are uniformly arranged on the lower part of the inner wall of the aluminum alloy shell (4), wherein all the hygrometers are connected to a computer (12); the testing device also comprises a dielectric spectrum testing device (23) connected to the computer (12), a low-voltage testing wire (24) of the dielectric spectrum testing device (23) is also connected to a terminal grounding terminal (22), and a high-voltage testing end (15) is used for connecting a copper cable core (2) of a cable terminal to be detected.
The invention can quickly test the moisture invasion phenomenon of the high-voltage power cable terminal in the power system, and has important significance for ensuring the operation reliability of the power cable.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a device for detecting moisture intrusion at a medium-high voltage power cable terminal, which is used for achieving the purpose of rapidly testing and judging when a moisture intrusion phenomenon occurs at a high-high voltage power cable terminal in a power system, and the structure and the using mode of the device comprise the following contents:
firstly, a cable terminal (18) is placed in two aluminum alloy shells (4), wherein the aluminum alloy shells (4) are of a double-leaf openable symmetrical structure, a checking device is fixed by using a left-end upper screw (5) and a left-end lower screw (7) of the checking device, then the left-end screw is screwed, the left-end upper screw (5), the left-end lower screw (7) and the left-end screw (6) are tightly attached to the surface of a waterproof jacket (8), then a right-end upper screw (13) and a right-end lower screw (16) are screwed, the checking device is fastened, wherein a right-end upper screw (13) and a right-end lower screw (16) are tightly contacted with a metal end (17), and then a No. 1 hygrometer (9), a No. 2 hygrometer (10) and a No. 3 hygrometer (11) are uniformly placed on the inner wall surface of the aluminum alloy shells (4), a No. 4 hygrometer (21), a No. 5 hygrometer (20) and a No. 6 hygrometer (19) are symmetrically arranged on the lower surface of the inner wall of an aluminum alloy shell (4), the 6 humidity sensors are connected to a computer (12) through coaxial twisted-pair data wires, one end of the aluminum alloy shell (4) is in close contact with a cable outer sheath (3), the other end of the aluminum alloy shell is in close contact with a copper cable core (2), a high-voltage testing end (15) in a dielectric spectrum testing device (23) is connected to the copper cable core (2) through a fastening nut (14), a low-voltage testing wire (24) in the dielectric spectrum testing device (23) is connected to a terminal grounding terminal (22) for measuring the conductance current passing through a cable insulating layer (1), and finally testing data are transmitted to the computer (12) through a communication cable by the dielectric spectrum testing device (23) and are communicated with the No. 1 hygrometer (9), the No. 2 hygrometer (10), Monitoring data of the No. 3 hygrometer (11), the No. 4 hygrometer (21), the No. 5 hygrometer (20) and the No. 6 hygrometer (19) are combined to analyze the moisture invasion condition of the medium-high voltage power cable terminal.
When in use, the utility model is used,
1) connecting all parts of the medium-high voltage power cable terminal moisture intrusion inspection device, opening a computer (12), monitoring the humidity condition in the inspection device, recording and storing data once every 30min by the computer (12), continuously recording for 5 hours, and recording the monitoring data as w1i、w2i、w3i、w4i、w5i、w6iThe value range of i is 1-10, and i is an integer, so that a multi-dimensional sample set D is formed; and (3) preliminarily estimating the terminal moisture invasion condition by using the monitored humidity data inside the inspection device every 5 hours, wherein the data comprises the following steps:
2) determining the humidity w of the external environment of the terminal:
comparing the humidity w of the external environment of the terminal with a first threshold value w0Size of (1), w0Can be set according to the environmental conditions of the construction area, if w is less than or equal to w0The checking device continues to repeat the second step; if w>w0Continuing to execute the work of the step 3);
3) judging the moisture invasion condition of the cable terminal
In the second step w>w0And the high-voltage testing end (15) and the low-voltage testing line (24) are respectively connected with the dielectric spectrum testing device (23) to obtain a fitting curve model of the dielectric spectrum, so that the moisture invasion and moisture degree of the cable terminal can be further analyzed.
Claims (1)
1. The device for detecting the moisture invasion of the medium-high voltage power cable terminal is characterized by comprising an aluminum alloy shell (4), wherein the aluminum alloy shell (4) is of a double-leaf symmetrical structure capable of being opened and closed, a left end upper screw (5), a left end head screw (6) and a left end lower screw (7) for fastening a waterproof sheath (8) are arranged at the left end, a right end upper screw (13) and a right end lower screw (16) for fastening a metal end head (17) are arranged at the right end, the waterproof sheath (8) is used for sleeving the cable terminal to be detected, and the metal end head (17) is used for sleeving the end head of the cable terminal to be detected; the device also comprises a No. 1 hygrometer (9), a No. 2 hygrometer (10) and a No. 3 hygrometer (11) which are uniformly arranged on the upper part of the inner wall of the aluminum alloy shell (4), and a No. 4 hygrometer (21), a No. 5 hygrometer (20) and a No. 6 hygrometer (19) which are uniformly arranged on the lower part of the inner wall of the aluminum alloy shell (4), wherein all the hygrometers are connected to a computer (12); the testing device also comprises a dielectric spectrum testing device (23) connected to the computer (12), a low-voltage testing wire (24) of the dielectric spectrum testing device (23) is also connected to a terminal grounding terminal (22), and a high-voltage testing end (15) is used for connecting a copper cable core (2) of a cable terminal to be detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911063263.6A CN110726910A (en) | 2019-11-03 | 2019-11-03 | Medium-high voltage power cable terminal moisture intrusion detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911063263.6A CN110726910A (en) | 2019-11-03 | 2019-11-03 | Medium-high voltage power cable terminal moisture intrusion detection device |
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| CN110726910A true CN110726910A (en) | 2020-01-24 |
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| CN201911063263.6A Pending CN110726910A (en) | 2019-11-03 | 2019-11-03 | Medium-high voltage power cable terminal moisture intrusion detection device |
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2019
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Application publication date: 20200124 |