Cable conductor water permeability testing device
The water permeability testing device, which seals both ends of the cable, solves the problems of complex operation and cable damage in the existing technology, and achieves the effects of simplified operation and improved test reliability.
Patent Information
- Application Number
- CN202520051568.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2035-01-09
AI Technical Summary
Existing methods for testing the water permeability of cable conductors are demanding, difficult, and prone to damaging the cable, and the sealing process is complex. In particular, when the cable is circumferentially cut in the middle, different sealing schemes with different water-blocking structures need to be considered.
A cable conductor water permeability testing device with both ends sealed is used. Water injection and outlet connection sleeves are used to seal both ends of the cable. The design of transparent tube and air valve simplifies the sealing process, and heat shrink cap and asphalt layer enhance the sealing connection strength to ensure the effectiveness of the test process.
This reduces the difficulty of cutting and sealing during testing, avoids cable damage, simplifies the operation process, and improves the reliability and accuracy of testing.
Smart Images
Figure CN223808310U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to cable detection field, specifically is a kind of cable conductor water permeation testing device. BACKGROUND
[0002] With the rapid development of China's economy, the electricity consumption of residents is increasing sharply, and large-scale power transmission has become a major problem for people. Transmission lines can be divided into overhead transmission lines and underground transmission lines according to structure, and the overhead transmission line is a bare conductor frame on the line tower, which can generate an electromotive force around it, and is usually used in the wild away from the city, so it has certain limitations. Underground transmission lines are power cables laid underground or underwater, which have better insulation than overhead transmission lines, and their advantages in urban construction are more prominent. However, some cable laying environments are very harsh, and they must withstand rain, snow, hail and other weather, and resist floods and other natural disasters, so water-blocking conductors are gradually applied to power cables. Currently, there are two main structures of water-blocking conductors. One is to wrap a water-blocking tape between each layer of conductor, and the other is to fill water-blocking glue between the gaps of the conductor. Both structures use water-blocking tape or water-blocking glue to swell and block water from entering when the conductor is wet.
[0003] To adapt to different use environments, water-blocking conductors with different water-blocking capabilities need to be selected, so the water-blocking capability of the conductor of the cable needs to be tested after the production of the cable is completed. According to the test method in GB / T 11017-2024.1, a circular ring should be cut off in the middle part of the cable, and the cut-off circular ring should include all layers of materials including insulation shielding. If the conductor also has a longitudinal water-blocking structure, the cut-off circular ring should include all layers of materials except the conductor. Then, a pipe is vertically placed on the cut circular ring and sealed with the outer sheath surface, and the seal between the cable and the device should not produce mechanical stress on the cable. The operation of this test method requires high requirements and is difficult to operate, and it often takes a long time to complete the test operation. SUMMARY
[0004] The technical problem to be solved by the utility model is to provide a cable conductor water permeation testing device with low operation requirements and low difficulty.
[0005] The technical solution adopted by the utility model to solve the above problems is: a cable conductor water permeation testing device, which includes a cable for testing, one end of the cable is sealingly connected to a water injection connector, the other end of the cable is sealingly connected to an outlet connector, a water injection pipe is connected to the axis of the water injection connector, the end of the water injection pipe away from the water injection connector is vertically arranged, and the water injection pipe is a transparent pipe, and a gas valve is connected to the axis of the outlet connector.
[0006] Compared with the prior art, the utility model discloses the advantages that: the water permeability test of cable conductor is carried out in the mode of two ends closed, in the testing process, the traditional test method is not needed to the ring cutting of the middle part of cable, so as not to worry about the damage of cable in the ring cutting process and affect the test structure, and also need not consider different ring cutting scheme because of the different water -resisting structure on the cable, but only need to guarantee that the cable both ends satisfy the test requirement flatness, reduced the cutting difficulty and requirement of test, simultaneously, in the sealing process, the traditional test method is in the sealing of the both ends of cutting groove in the middle part, and in the scheme, the sealing position is two, but the operability of the middle part sealing is lower than the sealing of end part, many operations are not applicable to the sealing of middle part, even some sealing members are annular, need to move from the end part to the middle area, and its sealing process is more complex, compared with the sealing difficulty of end part is lower, and the design of transparent pipe is to facilitate the observation of the water pipe change in water injection pipe, guarantees the effectiveness of testing process, and the design of air valve is to guarantee the smooth discharge of gas in cable conductor in the testing process, avoids the influence of gas on test result.
[0007] As one kind of improvement of the utility model, the water injection connecting sleeve includes a big heat shrink cap and a small heat shrink cap, the small heat shrink cap is sleeved on the cable and is sealed and connected with the cable, the big heat shrink cap is sleeved on the small heat shrink cap and is sealed and connected with the small heat shrink cap, and the water injection pipe is fixedly connected with the small heat shrink cap after passing through the big heat shrink cap, through the improvement, in the testing process, the area that is easy to leak is mainly the connecting place of water injection connecting sleeve and cable, so multiple waterproof sealing structures need to be set to the connecting place of water injection connecting sleeve and cable to guarantee sealing effect.
[0008] As one kind of improvement of the utility model, the connecting place of small heat shrink cap and cable is sealed by AB glue, through the improvement, after the small heat shrink cap is heated and shrunk and sealed and connected on the cable, the sealing connection strength between small heat shrink cap and cable is increased by AB glue.
[0009] As an improvement of the utility model, the pitch layer is filled between the large heat shrink cap and the small heat shrink cap, through the improvement, because water will be injected in the water injection pipe during the test, a high pressure water column is formed to test the water permeability between the conductors under the high pressure of the high pressure water column, but at the same time, the small heat shrink cap will expand under the long-term high pressure of the high pressure water column, causing problems such as the inability of the glue to adhere, thereby damaging the sealing connection between the water injection sleeve and the cable, therefore, the design of the pitch layer greatly enhances the structural strength of the small heat shrink cap, avoids the expansion problem of the small heat shrink cap, thereby ensuring the sealing connection between the small heat shrink cap and the cable, and the design of the large heat shrink cap forms a pitch cavity for filling pitch between the small heat shrink cap, if the pitch covers less on the surface of the small heat shrink cap, it still cannot guarantee the sealing connection between the small heat shrink cap and the cable, and cannot be remedied by secondary covering of the pitch layer, because there will be gaps between different batches of pitch layers, which cannot achieve the shaping effect, therefore, the covering of the pitch layer needs to be completed at one time, and through the design of the large heat shrink cap, the pitch cavity is filled to ensure sufficient covering of the pitch layer.
[0010] As an improvement of the utility model, the connection between the water injection pipe and the large heat shrink cap adopts interference fit connection, the small heat shrink cap is provided with a connecting pipe for plug connection with the water injection pipe on the axis, and the end of the connecting pipe away from the water injection pipe is connected with the conductor of the cable, through the improvement, the pipeline communication between the water injection pipe and the conductor is realized, wherein the connection between the water injection pipe and the large heat shrink cap adopts interference fit connection, in order to ensure the connection tightness between the water injection pipe and the large heat shrink cap, avoid the seepage of pitch from the gap between the water pipe and the large heat shrink cap when injecting pitch, and at the same time, the covering of pitch can strengthen the connection strength between the water injection pipe and the connecting pipe, ensure the connection tightness between the water injection pipe and the connecting pipe, and avoid water leakage between the water injection pipe and the connecting pipe due to the influence of the high pressure water column.
[0011] As an improvement of the utility model, the upper end of the large heat shrink cap is provided with a pitch hole for injecting pitch between the large heat shrink cap and the small heat shrink cap, through the improvement, the standard large heat shrink cap does not have a pitch hole structure, the pitch hole is formed for subsequent processing, and it is convenient to add pitch between the large heat shrink cap and the small heat shrink cap.
[0012] As an improvement of the utility model, the large heat shrink cap, the small heat shrink cap and the cable form a stepped shape, and the SJD adhesive tape, the water pipe sealing raw adhesive tape and the glass fiber adhesive tape are sequentially wrapped from inside to outside along the outer layers of the large heat shrink cap, the small heat shrink cap and the cable, through the improvement, the sealing connection strength between the water injection connecting sleeve and the cable is further ensured.
[0013] As a kind of improvement of the utility model, the outlet connecting sleeve includes a sealing heat shrink cap, the sealing heat shrink cap is sealedly connected with the other end of cable, the connecting place of sealing heat shrink cap and cable is sealed by AB glue, by the improvement, there is no too much water pressure between outlet connecting sleeve and cable, so the sealed connection between sealing heat shrink cap and cable is not easy to be damaged, only need to use simple AB glue sealing and the heat shrink sealing of sealing heat shrink cap. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is the overall sectional view structural schematic diagram of the utility model.
[0015] Figure 2 It is the sectional view connecting structure schematic diagram of the utility model water injection connecting sleeve.
[0016] As shown in the figure: 1, cable, 1.1, conductor, 1.2, outer sheath, 2, water injection connecting sleeve, 2.1, large heat shrink cap, 2.1.1, pitch hole, 2.2, small heat shrink cap, 2.2.1, connecting pipe, 2.3, pitch layer, 3, outlet connecting sleeve, 3.1, sealing heat shrink cap, 4, water injection pipe, 5, air valve, 6, SJD adhesive tape, 7, water pipe sealing raw adhesive tape, 8, glass fiber adhesive tape. DETAILED DESCRIPTION
[0017] The embodiment of the utility model is further described below in combination with the drawings.
[0018] As Figure 1 Shown, a kind of cable conductor water permeation test device, including cable 1 for testing, cable 1 includes conductor 1.1 and outer sheath 1.2, conductor 1.1 is used to carry out conductor 1.1 water permeation test, outer sheath 1.2 is used to connect fixed, the one end of the cable 1 is sealedly connected with water injection connecting sleeve 2, the other end of the cable 1 is sealedly connected with outlet connecting sleeve 3, the axis of the water injection connecting sleeve 2 is connected with a water injection pipe 4, the end of the water injection pipe 4 away from water injection connecting sleeve 2 is vertically arranged and water injection pipe 4 is transparent pipe, the axis of the outlet connecting sleeve 3 is connected with an air valve 5.
[0019] As Figure 2As shown, the water injection connecting sleeve 2 comprises a large heat shrink cap 2.1 and a small heat shrink cap 2.2, the small heat shrink cap 2.2 is sleeved on the cable 1 and is in sealed connection with the cable 1, the large heat shrink cap 2.1 is sleeved on the small heat shrink cap 2.2 and is in sealed connection with the small heat shrink cap 2.2, the water injection pipe 4 is fixedly connected with the small heat shrink cap 2.2 after passing through the large heat shrink cap 2.1, the connection between the small heat shrink cap 2.2 and the cable 1 is sealed by AB glue, the large heat shrink cap 2.1 and the small heat shrink cap 2.2 are filled with an asphalt layer 2.3, the connection between the water injection pipe 4 and the large heat shrink cap 2.1 adopts interference fit connection, the small heat shrink cap 2.2 is provided with a connecting pipe 2.2.1 for plugging with the water injection pipe 4 on the axis of the small heat shrink cap 2.2, the connecting pipe 2.2.1 is provided with anti-coming-off grooves to enhance the connection strength between the connecting pipe 2.2.1 and the water injection pipe 4, the end of the connecting pipe 2.2.1 away from the water injection pipe 4 is connected with the conductor 1.1 of the cable 1, and the upper end of the large heat shrink cap 2.1 is provided with an asphalt hole 2.1.1 for injecting asphalt between the large heat shrink cap 2.1 and the small heat shrink cap 2.2.
[0020] The large heat shrink cap 2.1, the small heat shrink cap 2.2 and the cable 1 form a stepped shape, and the outer layers of the large heat shrink cap 2.1, the small heat shrink cap 2.2 and the cable 1 are successively wrapped with SJD adhesive tape 6, water pipe sealing raw rubber tape 7 and glass fiber adhesive tape 8 from inside to outside.
[0021] The installation steps of the water injection connecting sleeve 2 are as follows:
[0022] S1: Apply A glue on the upper end of the outer sheath 1.2 and B glue on the inner diameter of the small heat shrink cap 2.2;
[0023] S2: Heat the small heat shrink cap 2.2 with a blowtorch to make the small heat shrink cap 2.2 shrink and adhere to the outer sheath 1.2;
[0024] S3: Drill a through hole slightly smaller than the diameter of the water injection pipe 4 on the axis of the large heat shrink cap 2.1;
[0025] S4: Insert the insertion end of the water injection pipe 4 into the through hole;
[0026] S5: Sleeve the large heat shrink cap 2.1 onto the small heat shrink cap 2.2, and sleeve and fix the water injection pipe 4 on the connecting pipe 2.2.1, leaving space for the asphalt layer 2.3 between the large heat shrink cap 2.1 and the small heat shrink cap 2.2;
[0027] S6: Heat the large heat shrink cap 2.1 with a blowtorch to make the large heat shrink cap 2.1 shrink and adhere to the small heat shrink cap 2.2;
[0028] S7: Inject asphalt from the asphalt hole 2.1.1 until the asphalt layer 2.3 is filled;
[0029] S8: After the pitch is solidified, the SJD tape 6, the water pipe sealing raw tape 7, and the glass fiber tape 8 are sequentially wrapped from inside to outside along the large heat shrink cap 2.1, the small heat shrink cap 2.2, and the outer layer of the cable 1, and the pitch hole 2.1.1 is covered.
[0030] S9: The installation of the water injection connecting sleeve 2 is completed.
[0031] The outlet connecting sleeve 3 includes a sealing heat shrink cap 3.1, which is sealingly connected to the other end of the cable 1. The connection between the sealing heat shrink cap 3.1 and the cable 1 is sealed by AB glue, and the installation steps are the same as those of the small heat shrink cap 2.2.
[0032] The testing steps of the cable conductor water permeability testing device are as follows:
[0033] S1: The air valve 5 is closed, and the first water injection is performed on the water injection pipe 4, and the water injection height is far lower than the test height, and the water injection height is 0.2-0.4m;
[0034] S2: Rest until the water level no longer changes, at which time the water pressure of the water injection pipe 4 and the air pressure between the conductor 1.1 and the small heat shrink cap 2.2 form a balance;
[0035] S3: The air valve 5 is opened;
[0036] S4: Rest until the water level no longer changes, at which time the air between the conductor 1.1 and the small heat shrink cap 2.2 has been discharged, and the water has penetrated into the conductor 1.1;
[0037] S5: The air valve 5 is closed;
[0038] S6: The second water injection is performed on the water injection pipe 4, and the water column height is 1-2m;
[0039] S7: Rest for 24h, and observe that the water level does not change significantly, and determine that the test is completed;
[0040] S8: Mark the distance on the outer sheath 1.2;
[0041] S9: According to the corresponding position, the cable 1 is sawn open, the wetting condition of the conductor 1.1 is observed, and the water permeability of the conductor 1.1 is determined.
[0042] The steps S1-S4 are mainly to discharge the air between the conductor 1.1 and the small heat-shrinkable cap 2.2, so as to avoid that the air in the area hinders the water from contacting the conductor 1.1 when the test is performed, and the water permeability of the conductor 1.1 cannot be detected. Therefore, the air between the conductor 1.1 and the small heat-shrinkable cap 2.2 needs to be discharged, so as to ensure that the water in the water injection pipe 4 contacts the conductor 1.1. When the air between the conductor 1.1 and the small heat-shrinkable cap 2.2 is discharged, the first water injection height needs to be avoided to be too high. Because in the case that the air valve 5 is opened, the water permeability between the conductors 1.1 will be greatly improved. In order to avoid that the water permeability in the air discharging process exceeds or is close to the water permeability under the closed condition, the water permeability under the closed condition is closer to the water permeability of the cable 1 in the actual use process.
[0043] The above only describes the best embodiment of the utility model, but cannot be understood as the limitation of the claims. The utility model is not limited to the above embodiment, and the specific structure can be changed. Any change within the protection scope of the independent claim of the utility model is within the protection scope of the utility model.
Claims
1. A cable conductor water penetration test apparatus, characterized by: The utility model provides a kind of cable (1) for test, one end of the cable (1) is sealedly connected water injection connector (2), the other end of the cable (1) is sealedly connected with outlet connector (3), the axis of the water injection connector (2) is connected with a water injection pipe (4), the end of the water injection pipe (4) away from water injection connector (2) is vertically arranged and water injection pipe (4) is transparent pipe, the axis of the outlet connector (3) is connected with a gas valve (5), the water injection connector (2) includes a large heat shrink cap (2.1) and a small heat shrink cap (2.2), the small heat shrink cap (2.2) is sleeved on cable (1) and is sealedly connected with cable (1), the large heat shrink cap (2.1) is sleeved on small heat shrink cap (2.2) and is sealedly connected with small heat shrink cap (2.2), the water injection pipe (4) is fixedly connected with small heat shrink cap (2.2) after passing through large heat shrink cap (2.1), the connection of the small heat shrink cap (2.2) and cable (1) is sealed by AB glue, the large heat shrink cap (2.1) and small heat shrink cap (2.2) are filled with pitch layer (2.3), the connection of the water injection pipe (4) and large heat shrink cap (2.1) uses interference fit connection, the axis of the small heat shrink cap (2.2) is provided with connecting pipe (2.2.1) for inserting with water injection pipe (4), the end of the connecting pipe (2.2.1) away from water injection pipe (4) is connected with the conductor (1.1) of cable (1).
2. The cable conductor water treeing test apparatus of claim 1 wherein: The upper end of the large heat shrink cap (2.1) is provided with pitch hole (2.1.1) for injecting pitch between the large heat shrink cap (2.1) and the small heat shrink cap (2.2).
3. The cable conductor water treeing test apparatus of claim 1 wherein: The large heat shrink cap (2.1), the small heat shrink cap (2.2) and the cable (1) form a ladder shape, and the SJD adhesive tape (6), the water pipe sealing raw adhesive tape (7) and the glass fiber adhesive tape (8) are sequentially wrapped from the inside to the outside along the outer layers of the large heat shrink cap (2.1), the small heat shrink cap (2.2) and the cable (1).
4. The cable conductor water treeing test apparatus of claim 1 wherein: The outlet connector (3) includes a sealed heat shrink cap (3.1), the sealed heat shrink cap (3.1) is sealedly connected with the other end of the cable (1), and the connection between the sealed heat shrink cap (3.1) and the cable (1) is sealed by AB glue.