Symmetrically distributed neutral wire core temperature sensing optical fiber composite early warning cable
By pre-embedding temperature-sensing optical fibers inside the cable and combining them with symmetrically distributed phase and neutral conductors, the issues of real-time performance and accuracy in cable temperature monitoring were resolved, enabling continuous monitoring of the cable temperature throughout the entire line and reducing the impact of electromagnetic interference.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- KUNMING CABLE GRP KUNDIANGONG CABLE CO LTD
- Filing Date
- 2025-04-30
- Publication Date
- 2026-05-12
Smart Images
Figure CN224232396U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of composite cable technology, and more specifically, to a symmetrically distributed neutral core temperature-sensing optical fiber composite early warning cable. Background Technology
[0002] During the use of cables, the temperature of the cable rises due to the current passing through the conductor. Under normal circumstances, the temperature of the cable is within a controllable range. However, if there is an abnormality in the circuit, the temperature will rise sharply, which may damage the equipment or even cause a safety accident. Therefore, monitoring and early warning of cable temperature are very important.
[0003] In existing technologies, sensors and thermal imagers are commonly used for measurement. These methods are point-distributed measurements, effective within the area where the equipment is installed, but unable to provide real-time monitoring outside that area. Furthermore, these external measurement methods are affected not only by cable temperature but also by ambient temperature, leading to reduced accuracy. Utility Model Content
[0004] The purpose of this invention is to provide a symmetrical distributed neutral core temperature-sensing fiber optic composite early warning cable with a novel structure that enables continuous monitoring of the entire line, improving the real-time performance and accuracy of monitoring.
[0005] The embodiments of this utility model are implemented as follows:
[0006] A symmetrically distributed neutral core temperature-sensing fiber optic composite early warning cable includes a shell, and three phase cores and three neutral cores located inside the shell; the three phase cores are arranged around the axis of the symmetrically distributed neutral core temperature-sensing fiber optic composite early warning cable to form a central region, and a temperature-sensing fiber is arranged in the central region; the three phase cores and the shell form three edge regions, and the three neutral cores are respectively located in the three edge regions.
[0007] Furthermore, in other preferred embodiments of this utility model, the temperature-sensing optical fiber is sheathed with a stainless steel microtube, the outer diameter of which is 1.5~2mm and the wall thickness is 0.2~0.5mm.
[0008] Furthermore, in other preferred embodiments of this invention, a water-blocking material is filled between the temperature-sensing optical fiber and the phase conductor core.
[0009] Furthermore, in other preferred embodiments of this utility model, the temperature-sensing optical fiber is provided with a redundant length of 0.1% to 0.3% of the total length of the symmetrically distributed neutral core temperature-sensing optical fiber composite early warning cable.
[0010] Furthermore, in other preferred embodiments of this invention, the bending radius of the temperature-sensing optical fiber within the stainless steel microtube is ≥40 mm.
[0011] Furthermore, in other preferred embodiments of this utility model, the phase conductor core includes a phase conductor and a first insulating layer sleeved on the phase conductor; the cross-sectional area of the phase conductor is 70~300mm². 2 The thickness of the first insulating layer is 3~5 mm.
[0012] Furthermore, in other preferred embodiments of this utility model, the neutral core includes a neutral conductor and a second insulating layer sleeved outside the neutral conductor; the cross-sectional area of the neutral conductor is 1 / 3 of that of the phase conductor, and the thickness of the second insulating layer is 1.5~3 mm.
[0013] Furthermore, in other preferred embodiments of this utility model, both the phase conductor and the neutral conductor are made of copper monofilaments with a diameter of 1.25~1.35 mm twisted together, with a twisting pitch ratio of 12~16D.
[0014] Furthermore, in other preferred embodiments of this utility model, the shell includes an inner liner, an armor layer, and an outer sheath layer from the inside out, and the edge areas are filled with filler.
[0015] The beneficial effects of this utility model embodiment are:
[0016] This utility model provides a symmetrically distributed neutral core temperature-sensing fiber optic composite early warning cable, which includes a housing, and three phase cores and three neutral cores located within the housing. The three phase cores are arranged around the axis of the symmetrically distributed neutral core temperature-sensing fiber optic composite early warning cable, forming a central region, within which a temperature-sensing fiber is disposed. By uniformly dividing the central core into three equal parts using a 3+3 layout, the electric field distribution of the cable is optimized, resulting in a more uniform electric field and reducing internal electromagnetic interference. Simultaneously, this symmetrically distributed neutral core temperature-sensing fiber optic composite early warning cable, by pre-embedding the temperature-sensing fiber inside the cable, enables continuous monitoring throughout the entire line, improving the real-time performance and accuracy of the monitoring. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1This is a cross-sectional view of one configuration of a symmetrically distributed neutral core temperature-sensing fiber optic composite early warning cable provided in an embodiment of the present utility model.
[0019] Icon: 100 - Symmetrical distributed neutral core temperature-sensing fiber optic composite early warning cable; 110 - Sheath; 111 - Inner liner; 112 - Armor layer; 113 - Outer sheath layer; 120 - Phase core; 121 - Phase conductor; 122 - First insulation layer; 130 - Neutral core; 131 - Neutral conductor; 132 - Second insulation layer; 140 - Temperature-sensing fiber optic; 150 - Water-blocking material; 160 - Filler. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0021] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.
[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. Example
[0025] This embodiment provides a symmetrically distributed neutral core temperature-sensing fiber optic composite early warning cable 100, referring to... Figure 1 As shown, it includes a housing 110, and three phase conductors 120 and three neutral conductors 130 located inside the housing 110.
[0026] Among them, such as Figure 1 As shown, three phase cores 120 are arranged around the axis of a symmetrically distributed neutral core temperature-sensing fiber optic composite early warning cable 100, forming a central area, within which a temperature-sensing fiber optic cable 140 is installed. This symmetrically distributed neutral core temperature-sensing fiber optic composite early warning cable 100, by pre-embedding the temperature-sensing fiber optic cable 140 inside the cable, can achieve continuous monitoring along the entire line. Simultaneously, the optical signal can effectively resist electromagnetic interference, improving the real-time performance and accuracy of monitoring compared to existing temperature measurement methods.
[0027] Furthermore, three edge regions are formed between the three phase conductors 120 and the housing 110, and the three neutral conductors 130 are located in the three edge regions respectively. By dividing the central conductor into three equal parts and using a 3+3 layout, the electric field distribution of the cable is optimized, making the electric field more uniform and reducing internal electromagnetic interference.
[0028] Furthermore, the temperature-sensing optical fiber 140 is sheathed with a stainless steel microtube (not shown in the figure). The temperature-sensing optical fiber 140 serves only as a sensing medium, and its breakage under stress should be avoided as much as possible. The stainless steel microtube effectively protects the internal temperature-sensing optical fiber 140, preventing mechanical compression and chemical corrosion. The outer diameter of the stainless steel microtube is 1.5~2mm, and the wall thickness is 0.2~0.5mm. By appropriately setting the outer diameter of the temperature-sensing optical fiber 140, its free length is ensured and it is not subject to compression.
[0029] A water-blocking material 150 is filled between the temperature-sensing optical fiber 140 and the phase core 120. The water-blocking material 150 absorbs moisture, keeping the temperature-sensing optical fiber 140 dry. Specifically, the water-blocking material 150 can be water-blocking yarn or powder commonly used in cables, and its water absorption expansion rate is best controlled within 10% to prevent excessive compression of the central area. To avoid the water-blocking material 150 excessively affecting thermal conductivity, the spacing between the temperature-sensing optical fiber 140 and the phase core 120 should be controlled at 2-5 mm. Simultaneously, to reduce the impact of the water-blocking material 150 on thermal conductivity, a small amount of thermally conductive filler 160, such as aluminum nitride, can also be filled in the central area.
[0030] The temperature-sensing optical fiber 140 is equipped with a redundant length of 0.1% to 0.3% of the total length of the symmetrically distributed neutral core temperature-sensing optical fiber composite early warning cable 100. This redundant length can compensate for the thermal expansion and contraction deformation of the cable, better protecting the temperature-sensing optical fiber 140. Furthermore, the bending radius of the temperature-sensing optical fiber 140 within the stainless steel microtube is ≥40 mm. Within this range, it can better adapt to the cable bending requirements while avoiding optical signal loss.
[0031] Optionally, such as Figure 1 As shown, the phase conductor core 120 includes a phase conductor 121 and a first insulation layer 122 sleeved on the phase conductor 121; the cross-sectional area of the phase conductor 121 is 70~300mm². 2 The thickness of the first insulation layer 122 is 3~5 mm. It can basically cover various commonly used cable specifications from medium voltage to high voltage.
[0032] The neutral core 130 includes a neutral conductor 131 and a second insulation layer 132 surrounding the neutral conductor 131. The cross-sectional area of the neutral conductor 131 is one-third that of the phase conductor 121, and the thickness of the second insulation layer 132 is 1.5~3 mm. The combined cross-sectional area of the three neutral conductors 131 is equal to that of a single phase core 120, achieving an effect equivalent to a traditional four-core cable. Both the first insulation layer 122 and the second insulation layer 132 are made of cross-linked polyethylene, providing better mechanical properties and insulation performance.
[0033] Furthermore, both the phase conductor 121 and the neutral conductor 131 are made of copper monofilaments with a diameter of 1.25~1.35 mm stranded together, with a stranding pitch ratio of 12~16D. This meets the mechanical strength requirements of the cable. The shell 110 includes, from the inside out, an inner lining layer 111, an armor layer 112, and an outer sheath layer 113. The inner lining layer 111, armor layer 112, and outer sheath layer 113 can all be selected from conventional materials used in existing cables, which is not the focus of this embodiment and will not be described in detail here.
[0034] In summary, this utility model provides a symmetrically distributed neutral core temperature-sensing fiber optic composite early warning cable 100, which includes a housing 110 and three phase cores 120 and three neutral cores 130 located within the housing 110. The three phase cores 120 are arranged around the axis of the symmetrically distributed neutral core temperature-sensing fiber optic composite early warning cable 100, forming a central region, within which a temperature-sensing fiber optic cable 140 is disposed. By uniformly dividing the central core into three equal parts using a 3+3 layout, the electric field distribution of the cable is optimized, making the electric field more uniform and reducing internal electromagnetic interference. Simultaneously, by pre-embedding the temperature-sensing fiber optic cable 140 inside the cable, this symmetrically distributed neutral core temperature-sensing fiber optic composite early warning cable 100 can achieve continuous monitoring throughout the entire line, improving the real-time performance and accuracy of monitoring.
[0035] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A symmetrically distributed neutral core temperature-sensing fiber optic composite early warning cable, characterized in that, The cable includes a housing, and three phase conductors and three neutral conductors located within the housing. The three phase conductors are arranged around the axis of the symmetrically distributed neutral conductor temperature-sensing fiber optic composite early warning cable, forming a central region, in which a temperature-sensing fiber optic cable is disposed. The three phase conductors and the housing form three edge regions, and the three neutral conductors are located in the three edge regions respectively.
2. The symmetrically distributed neutral core temperature-sensing fiber optic composite early warning cable according to claim 1, characterized in that, The temperature-sensing optical fiber is sheathed with a stainless steel microtube, the stainless steel microtube having an outer diameter of 1.5~2mm and a wall thickness of 0.2~0.5mm.
3. The symmetrically distributed neutral core temperature-sensing fiber optic composite early warning cable according to claim 2, characterized in that, Water-blocking material is filled between the temperature-sensing optical fiber and the phase conductor core.
4. The symmetrically distributed neutral core temperature-sensing fiber optic composite early warning cable according to claim 3, characterized in that, The temperature-sensing optical fiber is equipped with a redundant length of 0.1% to 0.3% of the total length of the symmetrically distributed neutral core temperature-sensing optical fiber composite early warning cable.
5. The symmetrically distributed neutral core temperature-sensing fiber optic composite early warning cable according to claim 4, characterized in that, The bending radius of the temperature-sensing optical fiber inside the stainless steel microtube is ≥40 mm.
6. The symmetrically distributed neutral core temperature-sensing fiber optic composite early warning cable according to claim 5, characterized in that, The phase conductor core includes a phase conductor and a first insulating layer sleeved on the phase conductor; the cross-sectional area of the phase conductor is 70~300mm². 2 The thickness of the first insulating layer is 3~5 mm.
7. The symmetrically distributed neutral core temperature-sensing fiber optic composite early warning cable according to claim 6, characterized in that, The neutral conductor includes a neutral conductor and a second insulating layer sleeved outside the neutral conductor; the cross-sectional area of the neutral conductor is 1 / 3 of that of the phase conductor, and the thickness of the second insulating layer is 1.5~3 mm.
8. The symmetrically distributed neutral core temperature-sensing fiber optic composite early warning cable according to claim 7, characterized in that, Both the phase conductor and the neutral conductor are made of copper monofilaments with a diameter of 1.25~1.35 mm twisted together, with a twisting pitch ratio of 12~16D.
9. The symmetrically distributed neutral core temperature-sensing fiber optic composite early warning cable according to claim 8, characterized in that, The housing comprises an inner liner, an armor layer, and an outer sheath layer from the inside out, and the edge regions are filled with filler.