CN211554196U - Detection and repair device for uneven damp state of XLPE cable terminal - Google Patents
Detection and repair device for uneven damp state of XLPE cable terminal Download PDFInfo
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- CN211554196U CN211554196U CN201922003290.6U CN201922003290U CN211554196U CN 211554196 U CN211554196 U CN 211554196U CN 201922003290 U CN201922003290 U CN 201922003290U CN 211554196 U CN211554196 U CN 211554196U
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Abstract
The utility model discloses a detection and prosthetic devices of inhomogeneous moisture bearing state of XLPE cable termination. The detection device for detecting the uneven moisture state of the XLPE cable terminal can achieve the purpose of quickly testing and judging when the phenomenon that the three-phase cable of the urban power distribution network is uneven in moisture degree occurs, and the repair device for the uneven moisture state of the XLPE cable terminal can complete the repair function of a seriously damped cable terminal. The beneficial effects of the utility model reside in that, can high-efficiently, accurate, real-time, conveniently measure and appraise and restore the inhomogeneous phenomenon of weing of three-phase cable that uses to areas such as city cable pit, transformer substation, avoid because of the inhomogeneous breakdown problem that leads to that weing of three-phase cable, realize the reliable operation of distribution network.
Description
Technical Field
The utility model relates to an urban distribution network cable evaluation and restoration field, especially a XLPE cable termination inhomogeneous detection and prosthetic devices who wets the state.
Background
In an urban power distribution network, the three-phase cables are inconsistent in load, the condition that the insulation states of different-phase cables are inconsistent often occurs, the running state of the three-phase cables is unbalanced, and the capacity of the cables for resisting the intrusion of moisture, humidity and the like in the external environment is obviously different. Along with the extension of cable service life, this kind of unbalanced phenomenon will be more and more serious, and then leads to the degree of weing of three-phase cable to appear showing the difference, the inhomogeneous problem of weing of distribution network three-phase cable appears, has seriously influenced the safe and reliable operation of distribution network, consequently needs carry out key monitoring to it.
At present, in actual detection, detection methods such as leakage current and insulation resistance are mostly used for detecting the uneven damp state of a three-phase cable of a power distribution network, but the methods all need to take the whole cable down and send the cable to a laboratory for special experimental testing, time and labor are wasted, and the detection effect is not ideal. Therefore, in order to reduce the workload of field detection work and improve the detection efficiency and accuracy, research needs to be carried out on the specific situation of the uneven moisture state of the three-phase cable of the power distribution network, and a device capable of efficiently and accurately evaluating the uneven moisture state of the XLPE cable terminal and realizing an effective repair function is provided.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a XLPE cable termination is inhomogeneous to be affected with damp detection and prosthetic devices for quick test and judgement when realizing that distribution network three phase cable is affected with damp inhomogeneous phenomenon of degree appears, and accomplish the repair function who seriously affected with damp cable termination.
Realize the utility model discloses the technical scheme of purpose as follows:
a device for detecting and repairing uneven damp state of an XLPE cable terminal comprises the following main components: the cable terminal comprises an A phase No. 1 end, a B phase No. 1 end, a C phase No. 1 end, an A phase No. 1 grounding wire, a B phase No. 1 grounding wire, a C phase No. 1 grounding wire, a direct grounding box, an A phase No. 2 grounding wire, a B phase No. 2 grounding wire, a C phase No. 2 grounding wire, a grounding protection box, a metal copper nose, a broadband low-voltage dielectric tester, a high-voltage testing end, a low-voltage acquisition end, a low-voltage connection cable, a coaxial transmission cable, a data processing computer, a supercharger control cable, an A phase No. 2 end, a B phase No. 2 end, a C phase No. 2 end, a repairing liquid collection end, a collection pipe, a supercharger, an input pipe and a repairing liquid input; the high-voltage testing end can be directly connected with the X-phase metal copper nose, and the low-voltage acquisition end needs to be connected with an X-phase No. 2 grounding wire through a low-voltage connecting cable; the data processing computer is respectively connected with the broadband low-voltage dielectric tester and the supercharger through a coaxial transmission cable and a supercharger control cable; the input end of the repair liquid is tightly hooped on the top of the X-phase No. 1 end terminal shed to be repaired, and can be tightly wound by using an expansion adhesive tape and the like to prevent the repair liquid from leaking, and the input end of the repair liquid is connected with a supercharger through an input pipe; the repair liquid collecting end is tightly hooped at the top of an X-phase No. 2 end terminal umbrella skirt to be repaired, an expansion adhesive tape and the like can be used for tightly winding to prevent the repair liquid from seeping out, and the repair liquid collecting end is connected with a supercharger through a collecting pipe.
The repair liquid is ordinary cable water branch repair liquid, and the repair liquid is condensed when meeting water to form a protective film, and the repair liquid is allowed to freely flow out at a part without water.
The beneficial effects of the utility model reside in that:
1. the utility model discloses a detection and prosthetic devices of the inhomogeneous state of weing of XLPE cable termination can be high-efficient, accurate, real-time, conveniently carry out the appraisal to the inhomogeneous phenomenon of weing of three-phase cable that regional uses such as city cable pit, transformer substation, avoids because of the inhomogeneous breakdown problem that leads to that weing of three-phase cable, realizes the reliable operation of distribution network.
2. The utility model discloses a detection and prosthetic devices of the inhomogeneous state of weing of XLPE cable termination can carry out early warning in advance and restoration processing to the inhomogeneous phenomenon of weing of looks cable, through test and analysis at the scene to the service performance that further explores the three-phase cable provides the foundation for the field personnel.
Drawings
Fig. 1 is the utility model discloses a detection and prosthetic devices's of the inhomogeneous damp state of XLPE cable termination structural sketch.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Fig. 1 is the utility model discloses a detection of the inhomogeneous state of weing of XLPE cable termination and prosthetic devices's connection schematic diagram realizes the purpose of quick test and judgement when the inhomogeneous phenomenon of distribution network three phase cable degree of weing appears to and accomplish the repair function who heavily wets cable termination, its test connection relation includes following content with the use mode:
the first step is as follows: composition and connection of devices
The device for detecting and repairing the uneven damp state of the XLPE cable terminal is characterized by comprising the following main components: the cable terminal comprises an A-phase 1 terminal 1, a B-phase 1 terminal 2, a C-phase 1 terminal 3, an A-phase 1 grounding wire 4, a B-phase 1 grounding wire 5, a C-phase 1 grounding wire 6, a direct grounding box 7, an A-phase 2 grounding wire 8, a B-phase 2 grounding wire 9, a C-phase 2 grounding wire 10, a grounding protection box 11, a metal copper nose 12, a broadband low-voltage dielectric tester 13, a high-voltage testing end 14, a low-voltage acquisition end 15, a low-voltage connection cable 16, a coaxial transmission cable 17, a data processing computer 18, a supercharger control cable 19, an A-phase 2 terminal 20, a B-phase 2 terminal 21, a C-phase 2 terminal 22, a repairing liquid collection end 23, a collection pipe 24, a supercharger 25, an input pipe 26 and a repairing liquid input end 27; the high-voltage testing end 14 can be directly connected with the X-phase metal copper nose 12, and the low-voltage collecting end 15 needs to be connected with an X-phase No. 2 grounding wire through a low-voltage connecting cable 16; the data processing computer 18 is respectively connected with the broadband low-voltage dielectric tester 13 and the booster 25 through a coaxial transmission cable 17 and a booster control cable 19; the repair liquid input end 27 is tightly hooped on the top of the X-phase No. 1 end terminal shed to be repaired, an expansion adhesive tape and the like can be used for tightly winding to prevent the repair liquid from leaking, and the repair liquid input end 27 is connected with the supercharger 25 through the input pipe 26; the repair liquid collecting end 23 is tightly hooped on the top of an X-phase No. 2 end terminal shed to be repaired, an expansion adhesive tape and the like can be used for tightly winding to prevent the repair liquid from seeping out, and the repair liquid collecting end 23 is connected with a supercharger 25 through a collecting pipe 24.
The model 13 of the broadband low-voltage dielectric tester is MEGGER IDAX 300/350; the supercharger 25 is model number WILO MHI 403.
The repair liquid is ordinary cable water branch repair liquid, and the repair liquid is condensed when meeting water to form a protective film, and the repair liquid is allowed to freely flow out at a part without water.
The second step is that: preparation for field evaluation
According to the routine inspection requirements of a power grid company, in combination with the on-site detection requirements, determining three-phase indoor cable terminals laid in cable trenches in the urban power distribution network to be detected or three-phase outdoor cable terminals connected to outlet terminals of electrical equipment such as a transformer and the like, disconnecting each single-core cable terminal from other electrical equipment, respectively determining an A-phase end 1, a B-phase end 2 and a C-phase end 3 of the cable terminal, then finding the grounding wire at the position, disconnecting the A-phase 1 grounding wire 4, the B-phase 1 grounding wire 5 and the C-phase 1 grounding wire 6 from a direct grounding box 7, and disconnecting the A-phase 2 grounding wire 8, the B-phase 2 grounding wire 9 and the C-phase 2 grounding wire 10 from a grounding protection box 11;
the third step: test loop for connecting power distribution network cable in damp state
Connecting the metal copper nose 12 of the A-phase end 1 with the high-voltage testing end 14 of the broadband low-voltage dielectric tester 13, connecting the A-phase No. 2 grounding wire 8 with the low-voltage acquisition end 15 of the broadband low-voltage dielectric tester 12, and setting the testing frequency point f of the broadband low-voltage dielectric tester 13kSequentially at 0.001Hz, 0.002Hz, 0.005Hz, 0.01Hz, 0.02Hz, 0.05Hz, 0.1Hz, 0.2Hz, 0.5Hz, 1Hz, 5Hz and 50Hz, taking k as 1,2, … and 12, starting the broadband low-voltage dielectric tester 13 to respectively obtain the corresponding real parts of the complex dielectric constantskAnd imaginary part of complex dielectric constantk″；
The fourth step: performing a function analysis of the A-phase cable dielectric test results
4.1 at frequency point f, obtained according to the second step1～f12Real part of complex dielectric constant obtained by the testkAnd imaginary part of complex dielectric constantk"curve, to which the fitting of the expression function is performed, first the solution of the intermediate transformation parameters is performed, as follows:
wherein q isk(f) Representing an interpolation basis function, fitting an intermediate transformation parameter as a function of the dielectric test result, and continuing the following processing;
4.2 will be at frequency point f1～f12Real part of complex dielectric constant obtained by the testk' (i.e. that1′～12') are in one-to-one correspondence and are taken into solution (2):
then, it will be at frequency point f1～f12Imaginary part of complex dielectric constant obtained by the process testk"(i.e., that is1″～12") are respectively in one-to-one correspondence and are put into solving the formula (3):
4.3 obtaining a dielectric test function, a real part function '-f and an imaginary part function' -f through the processing in the steps 4.1 and 4.2 respectively;
the fifth step: calculating the moisture characteristic parameter of A-phase cable
Respectively selecting 0.001 Hz-0.01 Hz, 0.02 Hz-0.2 Hz and 0.5 Hz-50 Hz as partition intervals by using the fitted dielectric test functions '-f and' -f, which are respectively marked as S1、S2、S3And calculating the A-phase cable damping characteristic parameters:
wherein s isAFor the dielectric test of the A-phase cable real part characteristic parameter, sA"is an imaginary part characteristic parameter of the A-phase cable dielectric test;
and a sixth step: respectively calculating the moisture characteristic parameters of the B-phase cable and the C-phase cable
Disconnecting the broadband low-voltage dielectric tester 13 from the A-phase cable, repeating the operations from the third step to the fifth step on the B-phase cable and the C-phase cable respectively, and calculating the characteristic parameter s of the real part of the dielectric test of the B-phase cable respectivelyB' and imaginary characteristic quantity sBCharacteristic parameter s of real part of dielectric test of' C-phase cableC' and imaginary characteristic quantity sC”；
The seventh step: judging method of uneven damp state of power distribution network cable
Calculating a contrast value of the three-phase cable damping characteristic parameter in the following calculation mode:
to JA、JB、JCSequencing is carried out, and the uneven moisture state of the power distribution network cable is judged:
in the sequence JAThe maximum value is, the moisture degree of the phase A in the power distribution network cable to be tested is the most serious;
eighth step: connecting the determined phase A No. 1 end with a repair liquid input end 27, so that the repair liquid input end 27 is tightly hooped on the top of the terminal shed of the phase A No. 1 end to be repaired; the phase A No. 2 end is connected with a repair liquid collecting end 23, so that the repair liquid collecting end 23 is tightly hooped on the top of an umbrella skirt of the phase A No. 2 end terminal to be repaired, a supercharger 25 is started through a data processing computer 18, and the repair operation of the cable terminal seriously affected by moisture is carried out;
the ninth step: and after the repair is finished, disconnecting all the testing and repairing connections, reconnecting the connection between each grounding wire and the grounding box, and recovering the connection between each single-core cable terminal and other electrical equipment.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (3)
1. The device for detecting and repairing the uneven damp state of the XLPE cable terminal is characterized by comprising the following main components: a phase 1 end (1), a B phase 1 end (2), a C phase 1 end (3), an A phase 1 grounding wire (4), a B phase 1 grounding wire (5), a C phase 1 grounding wire (6), a direct grounding box (7), an A phase 2 grounding wire (8), a B phase 2 grounding wire (9), a C phase 2 grounding wire (10), a grounding protection box (11), a metal copper nose (12), a broadband low-voltage dielectric tester (13), a high-voltage test end (14), a low-voltage acquisition end (15), a low-voltage connection cable (16), a coaxial transmission cable (17), a data processing computer (18), a supercharger control cable (19), an A phase 2 end (20), a B phase 2 end (21), a C phase 2 end (22), a repair liquid collection end (23), a collection pipe (24), a supercharger (25), an input pipe (26), A repair liquid input (27); the high-voltage testing end (14) can be directly connected with the X-phase metal copper nose (12), and the low-voltage acquisition end (15) is connected with the X-phase No. 2 grounding wire through a low-voltage connecting cable (16); the data processing computer (18) is respectively connected with the broadband low-voltage dielectric tester (13) and the booster (25) through a coaxial transmission cable (17) and a booster control cable (19); the repairing liquid input end (27) is tightly hooped at the top of an X-phase No. 1 end terminal shed to be repaired, an expansion adhesive tape and the like can be used for tightly winding to prevent the repairing liquid from leaking, and the repairing liquid input end (27) is connected with a supercharger (25) through an input pipe (26); the repair liquid collecting end (23) is tightly hooped at the top of an X-phase No. 2 end terminal umbrella skirt to be repaired, an expansion adhesive tape and the like can be used for tightly winding to prevent the repair liquid from seeping out, and the repair liquid collecting end (23) is connected with a supercharger (25) through a collecting pipe (24).
2. An XLPE cable termination uneven moisture condition detection and repair device as claimed in claim 1, characterized in that said broadband low voltage dielectric tester (13) is of the MEGGER IDAX 300/350 type.
3. An XLPE cable termination uneven moisture condition detection and repair device as claimed in claim 1, characterized in that said supercharger (25) is of the type WILO MHI 403.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922003290.6U CN211554196U (en) | 2019-11-19 | 2019-11-19 | Detection and repair device for uneven damp state of XLPE cable terminal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922003290.6U CN211554196U (en) | 2019-11-19 | 2019-11-19 | Detection and repair device for uneven damp state of XLPE cable terminal |
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| CN211554196U true CN211554196U (en) | 2020-09-22 |
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