220kv high voltage cable with monitoring optical fiber

Abstract

This utility model discloses a 220kV high-voltage cable with monitoring optical fiber, including a cable (1) and an optical cable (2). The optical cable (2) is used to monitor the temperature of the cable (1). The optical cable (2) is located on one side of the cable (1), and the optical cable (2) and the cable (1) are integrally extruded. The optical cable (2) includes an optical fiber bundle (2.1). A support member (2.2) is provided on the side of the optical fiber bundle (2.1) to ensure the structural strength of the optical cable (2) and to prevent the optical cable (2) from being deformed by compression. This utility model provides a 220kV high-voltage cable with monitoring optical fiber that enhances the compressive resistance of the monitoring optical fiber.

Description

Technical Field

[0001] This utility model relates to the field of cables, specifically a 220kV high-voltage cable with monitoring optical fiber. Background Technology

[0002] In the use of long-distance high-voltage cables, to ensure the normal operation of the high-voltage cables, a monitoring optical fiber is laid along the same path on the side of the high-voltage cable. Then, Raman scattering technology or fiber Bragg grating technology is used to monitor the temperature of the cable. When an abnormal operating condition occurs in a certain area of ​​the cable, the temperature around the cable will change, which will affect the scattered or refracted light of the optical pulse in the optical fiber. After the abnormal scattered or refracted light is fed back to the corresponding receiving equipment, the abnormal operating condition of the cable can be determined, and timely maintenance can be carried out.

[0003] However, since the function of monitoring optical fiber is limited to monitoring and not responsible for the transmission of important optical signals, the protective layer design of monitoring optical fiber is relatively simple. It is prone to problems such as compression deformation and damage, resulting in a high damage rate of monitoring optical fiber, which is not conducive to the long-term use of monitoring optical fiber. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a 220kV high-voltage cable with monitoring optical fiber that enhances the pressure resistance of the monitoring optical fiber.

[0005] The technical solution adopted by this utility model to solve the above problems is as follows: a 220kV high-voltage cable with monitoring optical fiber, including a cable and an optical cable. The optical cable is used to monitor the temperature of the cable. The optical cable is located on one side of the cable and is integrally extruded with the cable. The optical cable includes an optical fiber bundle. Support members are provided on the side of the optical fiber bundle to ensure the structural strength of the optical cable and to prevent the optical cable from being deformed by compression.

[0006] Compared with existing technologies, the advantages of this invention are as follows: A support structure is added to the optical cable. This support structure enhances the structural strength of the optical cable, improving its resistance to pressure and protecting the fiber bundle, thus reducing the probability of fiber damage. Furthermore, the overall manufacturing process is not altered; the support structure is simply added to the side of the fiber bundle during the extrusion molding of the outer sheath. This only slightly increases the complexity of the process without adding any steps, thus avoiding a significant increase in production costs or a reduction in production efficiency. Simultaneously, the integrated extrusion molding of the optical cable and cable during production ensures parallel spacing between them, maintaining consistent temperature control of the fiber bundle and effectively guaranteeing temperature monitoring performance while reducing the probability of misjudgment.

[0007] As an improvement of this utility model, the optical fiber bundle is provided with multiple fibers. Although the protection strength of the optical fiber bundle is increased by the design of the support component, the absolute safety of the optical fiber bundle cannot be guaranteed. The optical fiber bundle is still at risk of damage. Therefore, multiple optical fiber bundles are designed to ensure the monitoring effect of the optical cable. Only when all optical fiber bundles are damaged will the optical cable become completely ineffective.

[0008] As an improvement of this utility model, multiple fiber bundles are arranged radially along the cable. This improvement addresses the issue that during cable laying, the cable path is not straight but involves bending. When the cable bends, it can compress the optical fiber bundles. With the fiber bundles arranged radially, the farther the fiber bundle is from the cable, the less compression it experiences. However, the farther the fiber bundle is from the cable, the more pronounced the bending and stretching effect during bending, making it prone to breakage. Therefore, the distance between the fiber bundle and the cable is neither better the farther nor the closer. The bending radius of the cable varies depending on the laying environment, making it difficult to determine the optimal distance. Therefore, using multiple fiber bundles arranged radially ensures that some fiber bundles are in a suitable position. If multiple fiber bundles are arranged circumferentially along the cable, it is easy to fall into a situation where all fiber bundles experience excessive compression or bending stretching from the cable.

[0009] As an improvement of this utility model, the optical cable is elliptical in shape, with the focal point of the ellipse set along the radial direction of the cable. The support member is located between two adjacent fiber bundles. Through this improvement, since multiple fiber bundles are set along the radial direction of the cable, if a circular structure design is adopted, it is easy to cause the ineffective protection area of ​​the outer sheath of the optical cable to be too large, which will significantly increase the ineffective production cost of the optical cable. The elliptical shape ensures the smoothness of the optical cable shape, reduces the squeezing effect, and avoids a significant increase in ineffective production costs. At the same time, placing the support member between two adjacent fiber bundles ensures that the support member supports the entire optical cable while shortening the support length of the support member and reducing the production cost of the support member.

[0010] As an improvement of this utility model, the support member is S-shaped, with its two ends respectively located on both sides of the focal line connecting the ellipse. Through this improvement, the S-shaped design of the support member and the elliptical design of the optical cable make it easier for the external pressure to be squeezed from both ends of the support member when the optical cable is subjected to external pressure. Thus, the support member exhibits an elastic effect, providing sufficient buffer protection for the optical cable. After the compression ends, the support member can also restore the outer sheath of the optical cable. When the optical cable is subjected to the squeezing force of the cable, the support member can extend and expand to both ends, avoiding the squeezing force from acting directly on the optical fiber bundle, thereby reducing the impact of the squeezing on the optical fiber bundle.

[0011] As an improvement of this utility model, the outer layer of the cable includes a cable outer sheath and a cable semi-conductive layer, with the cable semi-conductive layer disposed on the outer layer of the cable outer sheath. The outer layer of the optical cable includes an optical cable outer sheath and an optical cable semi-conductive layer, with the optical cable semi-conductive layer disposed on the outer layer of the optical cable outer sheath. Through this improvement, the cable outer sheath and the cable semi-conductive layer play a role in protecting the cable, while the optical cable outer sheath and the optical cable semi-conductive layer play a role in ensuring the optical cable.

[0012] As an improvement of this utility model, the outer sheath of the cable and the outer sheath of the optical cable are integrally extruded. Through this improvement, the structure of the cable and the optical cable is integrally extruded.

[0013] As an improvement of this utility model, the cable semi-conductive layer and the optical fiber semi-conductive layer are integrally extruded. Through this improvement, high-voltage cables must undergo high-voltage resistance testing before use. The design of the cable semi-conductive layer allows for excellent physical and electrical connections, resulting in a uniform electric field distribution, ensuring consistent current distribution, reducing space charge accumulation or dielectric breakdown caused by local electric field differences, and improving the testing safety of high-voltage cables during high-voltage resistance testing. Simultaneously, the cable semi-conductive layer improves cable insulation performance, effectively suppressing interference from external electric fields on the cable insulation layer, thereby ensuring the accuracy of the high-voltage resistance test. When the cable and optical fiber are integrally formed, the outer layer of the optical fiber also needs to be designed with an optical fiber semi-conductive layer to ensure the safety and accuracy of the high-voltage resistance test. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the cross-sectional structure of this utility model.

[0015] The figure shows: 1. Cable, 1.1. Cable outer sheath, 1.2. Cable semi-conductive layer, 2. Optical cable, 2.1. Optical fiber bundle, 2.2. Support component, 2.3. Optical cable outer sheath, 2.4. Optical cable semi-conductive layer. Detailed Implementation

[0016] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0017] like Figure 1 As shown, a 220kV high-voltage cable with monitoring optical fiber includes a cable 1 and an optical cable 2. The optical cable 2 is used to monitor the temperature of the cable 1. The optical cable 2 is located on one side of the cable 1 and is integrally extruded with the cable 1. The optical cable 2 includes an optical fiber bundle 2.1. A support member 2.2 is provided on the side of the optical fiber bundle 2.1 to ensure the structural strength of the optical cable 2 and to prevent the optical cable 2 from being deformed by compression.

[0018] The optical fiber bundle 2.1 has three fibers, which are arranged radially along the cable 1. The optical cable 2 has an elliptical shape, with the focal point of the ellipse arranged radially along the cable 1. The support member 2.2 is located between two adjacent optical fiber bundles 2.1. The support member 2.2 is S-shaped, with its two ends located on both sides of the line connecting the focal points of the ellipse.

[0019] The outer layer of the cable 1 includes a cable outer sheath 1.1 and a cable semi-conductive layer 1.2, with the cable semi-conductive layer 1.2 disposed on the outer layer of the cable outer sheath 1.1. The outer layer of the optical cable 2 includes an optical cable outer sheath 2.3 and an optical cable semi-conductive layer 2.4, with the optical cable semi-conductive layer 2.4 disposed on the outer layer of the optical cable outer sheath 2.3. The cable outer sheath 1.1 and the optical cable outer sheath 2.3 are integrally extruded, and the cable semi-conductive layer 1.2 and the optical cable semi-conductive layer 2.4 are integrally extruded.

[0020] By designing a 220kV high-voltage cable with monitoring optical fibers, the structure of optical cable 2 was improved. An S-shaped support structure 2.2 was added inside optical cable 2, and the shape of optical cable 2 became elliptical. When optical cable 2 is subjected to external pressure, the external pressure is more easily squeezed from both ends of support structure 2.2, thus giving support structure 2.2 an elastic effect and providing sufficient buffer protection for optical cable 2. After the compression ends, support structure 2.2 can also restore the outer sheath 2.3 of optical cable. When optical cable 2 is subjected to the squeezing force of cable 1, support structure 2.2 can extend and expand to both ends, avoiding the squeezing force from acting directly on the optical fiber bundle 2.1. This reduces the impact of squeezing on optical fiber bundle 2.1, taking into account both the external squeezing pressure and the internal squeezing pressure of cable 2, improving the safety of optical cable 2, extending the service life of optical cable 2, and ensuring the monitoring effect of optical cable 2. Meanwhile, the cable 1 and optical cable 2 are integrally formed, and a semi-conductive layer 2.4 is added to the surface of optical cable 2 to ensure the safety and accuracy of the high-voltage cable in the high-voltage resistance test.

[0021] The above description only illustrates the preferred embodiment of this utility model and should not be construed as limiting the scope of the claims. This utility model is not limited to the above embodiments, and variations in its specific structure are permitted. All changes made within the scope of the independent claims of this utility model are also within the scope of protection of this utility model.

Claims

1. A 220kV high-voltage cable with a monitoring optical fiber, characterized in that: The cable (1) and the optical cable (2) are included. The optical cable (2) is used to monitor the temperature of the cable (1). The optical cable (2) is located on one side of the cable (1) and the optical cable (2) and the cable (1) are integrally extruded. The optical cable (2) includes an optical fiber bundle (2.1). The side of the optical fiber bundle (2.1) is provided with a support member (2.2) to ensure the structural strength of the optical cable (2) so as to avoid the optical cable (2) being deformed by compression.

2. The 220kV high-voltage cable with monitoring optical fiber according to claim 1, characterized in that: The fiber bundle (2.1) has multiple fibers.

3. The 220kV high-voltage cable with monitoring optical fiber according to claim 2, characterized in that: Multiple optical fiber bundles (2.1) are arranged radially along the cable (1).

4. The 220kV high-voltage cable with monitoring optical fiber according to claim 3, characterized in that: The optical cable (2) is elliptical in shape, with the focal point of the ellipse arranged radially along the cable (1), and the support (2.2) is located between two adjacent fiber bundles (2.1).

5. The 220kV high-voltage cable with monitoring optical fiber according to claim 4, characterized in that: The support member (2.2) is S-shaped, and the two ends of the support member (2.2) are respectively located on both sides of the focal line of the ellipse.

6. The 220kV high-voltage cable with monitoring optical fiber according to claim 1, characterized in that: The outer layer of the cable (1) includes a cable outer sheath (1.1) and a cable semiconducting layer (1.2), the cable semiconducting layer (1.2) being disposed on the outer layer of the cable outer sheath (1.1). The outer layer of the optical cable (2) includes an optical cable outer sheath (2.3) and an optical cable semiconducting layer (2.4), the optical cable semiconducting layer (2.4) being disposed on the outer layer of the optical cable outer sheath (2.3).

7. The 220kV high-voltage cable with monitoring optical fiber according to claim 6, characterized in that: The cable outer sheath (1.1) and the optical cable outer sheath (2.3) are integrally extruded.

8. The 220kV high-voltage cable with monitoring optical fiber according to claim 7, characterized in that: The cable semiconductive layer (1.2) and the optical cable semiconductive layer (2.4) are integrally extruded.

Images