Optical fiber composite insulator and optical current measuring device

Abstract

The application relates to an optical fiber composite insulator and an optical current measuring device. The optical fiber composite insulator comprises an insulator body, two connectors and two capacitor cores. The insulator body comprises a core rod and a sheath covering the core rod. The two connectors are respectively arranged at two ends of the core rod along the longitudinal direction. The two capacitor cores are respectively embedded in the two ends of the core rod. A plane parallel to the longitudinal direction is a reference plane. The normal projection of the connector and the capacitor core on the reference plane has an overlapping part. The optical fiber composite insulator can reduce the damage of the current measuring optical fiber.

Description

Technical Field

[0001] This invention relates to the field of optical current measuring device technology, and in particular to an optical fiber composite insulator and an optical current measuring device. Background Technology

[0002] The optical current measuring device mainly consists of three parts: an optical fiber current sensing ring, an optical fiber composite insulator, and a data acquisition unit. When measuring the current using the optical current measuring device, discharge erosion is prone to occur at the high-voltage and low-voltage ends of the optical fiber composite insulator, leading to damage to the current measuring optical fiber inside the optical fiber composite insulator. Summary of the Invention

[0003] Therefore, it is necessary to provide an optical fiber composite insulator and an optical current measuring device to avoid damaging the optical fiber when measuring the current.

[0004] In a first aspect, embodiments of the present invention provide an optical fiber composite insulator, comprising:

[0005] An insulator body, the insulator body comprising a core rod and a sheath covering the core rod;

[0006] Two connectors, each located at one end of the mandrel along its longitudinal direction; and

[0007] Two capacitor cores are respectively embedded at both ends of the core rod;

[0008] The plane parallel to the longitudinal direction is the reference plane;

[0009] The connector and the capacitor core located at the same end of the insulator body have overlapping projections on the reference plane.

[0010] In one embodiment, the capacitor core has an axial center along the longitudinal direction, and a plane passing through the axial center and perpendicular to the longitudinal direction is a first plane;

[0011] The connector located at the same end of the insulator body as the capacitor core has a first surface facing the other connector;

[0012] Wherein, the first plane and the first surface coincide with each other.

[0013] In one embodiment, the capacitor core has a dimension of L1 along the longitudinal direction, and the connector has a dimension of L2 along the longitudinal direction;

[0014] The ratio of L1 to L2 is 1-1.5.

[0015] In one embodiment, the core rod is provided with a first through hole for an optical fiber to pass through along the longitudinal direction, and the capacitor core is provided with a second through hole for an optical fiber to pass through from the first through hole along the longitudinal direction.

[0016] The diameter of the first through hole is d1, and the diameter of the second through hole is d2;

[0017] The ratio of d2 to d1 is less than 0.5.

[0018] In one embodiment, the core rod has limiting grooves at both ends, and each limiting groove has a limiting surface, which is used to limit the capacitor core in the longitudinal direction.

[0019] The capacitor core has an abutment surface that mates with the limiting surface;

[0020] When the capacitor core abuts against the corresponding end of the core rod, the capacitor core extends into the limiting groove, and the abutting surface fits against the limiting surface.

[0021] In one embodiment, the capacitor core has stepped portions on both sides along the longitudinal direction;

[0022] The contact surface is formed on the stepped portion.

[0023] In one embodiment, the capacitor core is formed by winding alternating layers of aluminum foil and crepe paper;

[0024] The aluminum foil layer contains at least one layer of aluminum foil, and the crepe paper layer contains at least one layer of crepe paper.

[0025] In one embodiment, the capacitor core is formed by epoxy resin casting and curing.

[0026] In one embodiment, the capacitor core includes a first core portion, a second core portion, and a third core portion connected sequentially along the longitudinal direction;

[0027] Along the longitudinal direction, the first core portion has a gradually increasing cross-sectional area, and the third core portion has a gradually decreasing cross-sectional area.

[0028] Secondly, embodiments of the present invention also provide an optical current measuring device, including an optical fiber composite insulator as described in any of the above embodiments.

[0029] The aforementioned fiber optic composite insulator and optical current measuring device, by placing two connectors at both ends of the insulator body's core rod along its longitudinal direction and embedding two capacitor cores at both ends of the insulator body's core rod, uses a plane parallel to the longitudinal direction as a reference plane. The orthographic projections of the connectors and capacitor cores located at the same end of the insulator body on the reference plane overlap. Therefore, by embedding capacitor cores at both ends of the insulator body, the electric field strength at the connectors can be balanced, reducing field distortion and thus reducing damage to the current measuring optical fiber. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the optical fiber composite insulator provided in an embodiment of the present invention;

[0031] Figure 2 This is a schematic projection of the connector and capacitor core provided in an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of a capacitor core embedded in a core rod according to an embodiment of the present invention;

[0033] Figure 4 Provided in the embodiments of the present invention Figure 3 A magnified schematic diagram of the local structure at point Q;

[0034] Figure 5 This is a schematic diagram of the capacitor core provided in an embodiment of the present invention;

[0035] Figure 6 Provided in the embodiments of the present invention Figure 5 A magnified schematic diagram of the local structure at point R in the middle;

[0036] Figure 7 This is a schematic diagram of the winding process of the capacitor core provided in an embodiment of the present invention;

[0037] Figure 8 This is a schematic diagram of the optical current measuring device provided in an embodiment of the present invention.

[0038] in:

[0039] 1000-Fiber Optic Composite Insulator;

[0040] 1100 - Insulator body;

[0041] 1110-core rod;

[0042] 1111 - Limiting groove;

[0043] 1112 - First through hole;

[0044] 1120 - Sheath;

[0045] 1200 - Connector;

[0046] 1300 - Capacitor core;

[0047] 1310 - Axial center;

[0048] 1320 - Step section;

[0049] 1330 - Aluminum foil layer;

[0050] 1340 - Crepe paper layer;

[0051] 1350 - Second through hole;

[0052] 1400-Rolled Tube;

[0053] 2000-Fiber Optic Current Sensing Ring;

[0054] 3000 - Acquisition Unit;

[0055] 4000 - Optical Current Measurement Device;

[0056] X - Longitudinal direction;

[0057] W - Reference plane;

[0058] P1 - First plane;

[0059] P2 - First surface;

[0060] Y1 - Limiting surface;

[0061] Y2 - Abutment surface;

[0062] H1 - High voltage end;

[0063] H2 - Low-voltage side;

[0064] Z1 - First core section;

[0065] Z2 - Second Core Section;

[0066] Z3 - Third Core Section. Detailed Implementation

[0067] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0068] In the description of this invention, 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," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0069] 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 at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0070] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," 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 mechanical connection or an electrical connection; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0071] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0072] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0073] As mentioned in the background section, optical current measuring devices mainly consist of three parts: an optical fiber current sensing ring, an optical fiber composite insulator, and a data acquisition unit. When measuring the current using an optical current measuring device, discharge erosion is prone to occur at the high-voltage and low-voltage ends of the optical fiber composite insulator, leading to damage to the current measuring optical fiber within the insulator.

[0074] The inventors of this application have noted that the fiber optic composite insulators in related technologies consist of a hollow composite insulator and optical fibers disposed inside the hollow composite insulator. Flanges are provided at both ends of the hollow composite insulator for ease of installation. During current measurement, field strength distortion is prone to occur at these flanges, which can cause discharge at the high-voltage and low-voltage ends of the fiber optic composite insulator, thereby damaging the optical fibers.

[0075] Based on the above considerations, the inventors of this application, through in-depth research, have improved the structure of the optical fiber composite insulator to avoid strong field distortion at both ends of the optical fiber composite insulator. The optical fiber composite insulator provided in this application will be further described below with reference to relevant accompanying drawings and some embodiments.

[0076] Figure 1 A schematic diagram of the optical fiber composite insulator provided in an embodiment of the present invention is shown; for ease of explanation, only the parts relevant to the embodiments of this application are shown. Figure 1 For example, a cross-sectional view of the fiber optic composite insulator is shown.

[0077] In some embodiments, see Figure 1 This invention provides an optical fiber composite insulator 1000. The optical fiber composite insulator 1000 includes an insulator body 1100, two connectors 1200, and two capacitor cores 1300. The insulator body 1100 includes a core rod 1110 and a sheath 1120 covering the core rod 1110. The two connectors 1200 are respectively disposed at both ends of the core rod 1110 along its longitudinal direction X. The two capacitor cores 1300 are respectively embedded at both ends of the core rod 1110. Figure 1 The image shows the longitudinal direction X. The plane parallel to the longitudinal direction X is the reference plane W. See [link to reference]. Figure 2 , Figure 2This is a schematic projection diagram of the connector 1200 and capacitor core 1300 provided in an embodiment of the present invention. The orthographic projections of the connector 1200 and capacitor core 1300 located at the same end of the insulator body 1100 on the reference plane W have an overlapping portion. Figure 2 The shaded area in the image is the overlapping area.

[0078] It should be noted that "the orthographic projections of the connector 1200 and the capacitor core 1300 at the same end of the insulator body 1100 on the reference plane W have an overlapping portion" means that the capacitor core 1300 at least partially extends into the interior of the connector 1200. Optionally, the capacitor core 1300 can be cylindrical or spindle-shaped, and is not limited here. The core rod 1110 can be a hollow epoxy tube, and the sheath 1120 can be a silicone rubber skirt. The connector 1200 can be a flange.

[0079] The aforementioned fiber optic composite insulator 1000, by placing two connectors 1200 at both ends of the core rod 1110 of the insulator body 1100 along the longitudinal direction X, and embedding two capacitor cores 1300 at both ends of the core rod 1110 of the insulator body 1100, uses a plane parallel to the longitudinal direction X as a reference plane W. The orthographic projections of the connectors 1200 and capacitor cores 1300 located at the same end of the insulator body 1100 on the reference plane W overlap. Therefore, by embedding capacitor cores 1300 at both ends of the insulator body 1100, the electric field strength at the connectors 1200 can be balanced, reducing field distortion and thus reducing damage to the current measurement fiber.

[0080] In some embodiments, see Figure 1 The capacitor core 1300 has an axial center 1310 along the longitudinal direction X. A plane passing through the axial center 1310 and perpendicular to the longitudinal direction X is a first plane P1. A connector 1200 located at the same end of the insulator body 1100 as the capacitor core 1300 has a first surface P2 facing the other connector 1200. The first plane P1 and the first surface P2 coincide with each other. That is, the plane passing through the axial center 1310 of the capacitor core 1300 at the high-voltage end H1 and perpendicular to the longitudinal direction X is the first plane P1, and the first plane P1 coincides with the first surface P2 of the connector 1200 at the high-voltage end H1 facing the low-voltage end H2. The plane passing through the axial center 1310 of the capacitor core 1300 at the low-voltage end H2 and perpendicular to the longitudinal direction X is the first plane P1, and the first plane P1 coincides with the first surface P2 of the connector 1200 at the low-voltage end H2 facing the high-voltage end H1.

[0081] In some embodiments, see Figure 1The capacitor core 1300 has a length of L1 along the longitudinal direction X, and the connector 1200 has a length of L2 along the longitudinal direction X. The ratio of L1 to L2 is 1-1.5.

[0082] In this embodiment, the ratio of L1 to L2 is 1-1.5, which means that a portion of the capacitor core 1300 of 0.5-0.75 overlaps with the orthographic projection of the connector 1200 on the reference plane W. Within this range, the electric field strength at the connector 1200 can be further balanced, resulting in a better electric field distribution.

[0083] In some embodiments, see Figure 1 The core rod 1110 has a first through hole 1112 along the longitudinal direction X for the optical fiber to pass through, and the capacitor core 1300 has a second through hole 1350 along the longitudinal direction X for the optical fiber to pass through from the first through hole 1112 (see below). Figure 7 The diameter of the first through hole 1112 is d1, and the diameter of the second through hole 1350 is d2. The ratio of d2 to d1 is less than 0.5.

[0084] In the embodiments of this application, the ratio of the second through hole 1350 of the capacitor core 1300 to the first through hole 1112 of the core rod 1110 is less than 0.5. This is to limit the size of the capacitor core 1300 along the first plane P1 direction to be smaller than the diameter of the first through hole 1112. Only then can the capacitor core 1300 be embedded in the core rod 1110, and the electric field strength of the overlapping portion of the capacitor core 1300 and the connector 1200 be better reduced, thus reducing the occurrence of electric field strength distortion.

[0085] Figure 3 A schematic diagram of a capacitor core embedded in a core rod according to an embodiment of the present invention is shown; for ease of explanation, only the parts related to the embodiments of this application are shown. Figure 4 Provided in the embodiments of the present invention Figure 3 A magnified schematic diagram of the structure at point Q.

[0086] In some embodiments, see Figure 3 and in conjunction with reference Figure 1 and Figure 4 The capacitor core 1300 has limiting grooves 1111 at both ends of the core rod 1110. Each limiting groove 1111 has a limiting surface Y1, which limits the position of the capacitor core 1300 in the longitudinal direction X. The capacitor core 1300 has an abutment surface Y2 that mates with the limiting surface Y1. When the capacitor core 1300 abuts against the corresponding end of the core rod 1110, the capacitor core 1300 extends into the limiting groove 1111, and the abutment surface Y2 fits against the limiting surface Y1.

[0087] Thus, by providing limiting grooves 1111 at both ends of the core rod 1110, with a limiting surface Y1 in the limiting groove 1111 and an abutting surface Y2 in the capacitor core 1300 that cooperates with the limiting surface Y1, the capacitor core 1300 can be better fixed inside the core rod 1110.

[0088] In some embodiments, please refer to the limiting groove 1111 for better utilization of the capacitor core 1300. Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of the capacitor core structure provided in an embodiment of the present invention. Figure 6 Provided in the embodiments of the present invention Figure 5 A partially enlarged structural diagram at point R shows that the capacitor core 1300 has stepped portions 1320 on both sides along the longitudinal direction X. The contact surface Y2 is formed at the stepped portion 1320.

[0089] In the embodiments of this application, the step portion 1320 can be set to a size of 2-3 mm along the first plane P1, which is sufficient to fix the capacitor core 1300 inside the core rod 1110. It is understood that the size of the step portion 1320 is not limited and can be set according to requirements.

[0090] Figure 7 A schematic diagram of the winding of a capacitor core provided in an embodiment of the present invention is shown; for ease of explanation, only the parts related to the embodiments of this application are shown.

[0091] In some embodiments, see Figure 7 The capacitor core 1300 is formed by winding alternating layers of aluminum foil 1330 and crepe paper 1340. The aluminum foil layer 1330 contains at least one layer of aluminum foil, and the crepe paper layer 1340 contains at least one layer of crepe paper.

[0092] It should be noted that "alternating arrangement" in "the capacitor core 1300 is formed by winding alternating layers of aluminum foil 1330 and crepe paper 1340" means that a layer of crepe paper is first set, followed by a layer of aluminum foil, and then another layer of crepe paper is added, and so on. Alternatively, a layer of aluminum foil is first set, followed by a layer of crepe paper, and then another layer of aluminum foil is added, and so on, and so on.

[0093] In the embodiments of this application, a capacitor core 1300 prototype is obtained by winding a crepe paper layer 1340 and an aluminum foil layer 1330 around a winding tube 1400. The aluminum foil layer 1330 contains at least one layer of aluminum foil, which represents an aluminum foil electrode.

[0094] In some embodiments, the capacitor core 1300 is formed by epoxy resin casting and curing.

[0095] Thus, the capacitor core 1300 prototype is cast and cured using epoxy resin. After the capacitor core 1300 prototype is cast and cured, the winding tube 1400 is extracted to obtain the capacitor core 1300. This method gives the fiber optic composite insulator 1000 high mechanical strength and reliable electrical stability, avoiding the reliability reduction problem caused by the introduction of components into the fiber optic composite insulator 1000.

[0096] In some embodiments, see Figure 5 The capacitor core 1300 includes a first core portion Z1, a second core portion Z2, and a third core portion Z3 connected sequentially along the longitudinal direction X. Along the longitudinal direction X, the first core portion Z1 has a gradually increasing cross-sectional area, and the third core portion Z3 has a gradually decreasing cross-sectional area.

[0097] It should be noted that the first core part Z1, the second core part Z2, and the third core part Z3 are a single integrated structure, constituting the capacitor core 1300. The shape of the capacitor core 1300 can be similar to... Figure 5 The spindle shape in the middle.

[0098] The fiber optic composite insulator 1000 mentioned in this invention is a suspended type. The empty space in the fiber optic composite insulator 1000 is filled with non-solidified insulating paste or insulating gas, which can achieve better insulation effect.

[0099] Figure 8 A schematic diagram of the structure of the optical current measuring device 4000 provided in an embodiment of the present invention is shown; for ease of explanation, only the parts related to the embodiments of this application are shown.

[0100] Based on the same inventive concept, see [link to inventive concept] Figure 8 The present invention also provides an optical current measuring device 4000, comprising an optical fiber composite insulator 1000 as described in any of the above embodiments, an optical fiber current sensing ring 2000, and a data acquisition unit 3000. The optical fiber current sensing ring 2000 is connected to the high-voltage end H1 of the optical fiber composite insulator 1000, and the low-voltage end H2 of the optical fiber composite insulator 1000 is connected to the data acquisition unit 3000 via a polarization-maintaining optical fiber.

[0101] The fiber optic current sensing ring 2000 is used to sense the current to be measured. The fiber optic current sensing ring 2000 is composed of multiple turns of sensing fiber with a circular hole in the center. The primary conductor passes through the circular hole and carries the current to be measured. Thus, the fiber optic current sensing ring 2000 can sense the current to be measured.

[0102] The acquisition unit 3000 is used to acquire the sensed current value to be measured. The acquisition unit 3000 includes multiple acquisition unit cabinets, each of which can acquire the current value to be measured. The multiple acquisition unit cabinets can be connected in parallel or in series.

[0103] pass Figure 8 It can be seen that in the optical fiber composite insulator 1000 of the optical current measuring device 4000, the capacitor core 1300 of the low voltage end H2 needs to be placed first, and then the capacitor core 1300 of the high voltage end H1 needs to be placed. Therefore, the size of the capacitor core 1300 of the low voltage end H2 along the first plane P1 should be slightly smaller than the size of the capacitor core 1300 of the high voltage end H1 along the first plane P1.

[0104] It should be noted that the number of aluminum foil layers 1330 in the capacitor core 1300 can be determined by the voltage level used by the optical current measuring device 4000. When the voltage level is 500KV, the number of aluminum foil layers 1330 should be greater than or equal to 3 layers; when the voltage level is 800KV, the number of aluminum foil layers 1330 should be greater than or equal to 5 layers. The aluminum foil layers 1330 are wound in a manner of equal thickness, that is, the distance between the aluminum foil layers 1330 is equal.

[0105] Specifically, using a voltage level of 500KV, an aluminum foil layer of 1330 with 3 layers and a thickness of 1 cm as an example, the winding method of the capacitor core 1300 is illustrated as follows: When the thickness of the crepe paper wound around the roll tube 1400 reaches 1 cm, a layer of aluminum foil electrode is wound, then the crepe paper is wound, and when the thickness reaches 1 cm again, another layer of aluminum foil electrode is wound, then the crepe paper is wound, and when the thickness reaches 1 cm again, another layer of aluminum foil electrode is wound, and finally another layer of crepe paper is wound.

[0106] The optical current measuring device 4000 mentioned in this invention is mainly used in DC systems with high voltage levels, because DC systems with high voltage levels are more prone to leakage hazards.

[0107] In summary, the fiber optic composite insulator 1000 and optical current measuring device 4000 of the present invention utilize two connectors 1200 respectively disposed at both ends of the core rod 1110 of the insulator body 1100 along the longitudinal direction X, and two capacitor cores 1300 respectively embedded at both ends of the core rod 1110 of the insulator body 1100. A plane parallel to the longitudinal direction X is used as a reference plane W, and the orthographic projections of the connectors 1200 and capacitor cores 1300 located at the same end of the insulator body 1100 on the reference plane W overlap. Therefore, by embedding capacitor cores 1300 at both ends of the insulator body 1100, the electric field strength at the connectors 1200 can be balanced, reducing field distortion and thus reducing damage to the current measuring optical fiber. The capacitor cores 1300 are formed by epoxy resin casting and curing, which gives the fiber optic composite insulator 1000 high mechanical strength and reliable electrical stability, avoiding the reliability reduction problem caused by the introduction of components into the fiber optic composite insulator 1000. The ratio of the dimension of the capacitor core 1300 along the longitudinal direction X to the dimension of the connector 1200 along the longitudinal direction X is 1-1.5. Within this range, the electric field strength at the connector 1200 can be further balanced, resulting in a better electric field distribution. Applying the fiber optic composite insulator 1000 of this invention to the optical current measuring device 4000 improves the reliability of the optical current measuring device 4000 in measuring the current to be measured, and ensures the safe and stable operation of the optical current measuring device 4000 in a DC system.

[0108] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0109] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An optical fiber composite insulator, characterized by The utility model relates to a kind of optical fiber composite insulators, comprising: An insulator body, the insulator body includes a core rod and a sheath wrapped on the core rod; Two connectors, two connectors are respectively arranged at two ends of the core rod along the longitudinal direction;And Two capacitor cores, two capacitor cores are respectively embedded in two ends of the core rod; Wherein, the plane parallel to the longitudinal direction is the reference plane; The connector and the capacitor core located at the same end of the insulator body have overlapping parts in the orthogonal projection on the reference plane; The size of the capacitor core along the longitudinal direction is L1, and the size of the connector along the longitudinal direction is L2; Wherein, the ratio of L1 and L2 is 1-1.

5.

2. The fiber optic composite insulator of claim 1, wherein, The capacitor core has an axial center along the longitudinal direction, and the plane passing through the axial center and perpendicular to the longitudinal direction is the first plane; The connector located at the same end of the capacitor core with the insulator body has a first surface towards the other connector; Wherein, the first plane and the first surface coincide with each other.

3. The fiber optic composite insulator of claim 1, wherein, The core rod is provided with a first through hole along the longitudinal direction for optical fiber to pass through, and the capacitor core is provided with a second through hole along the longitudinal direction for optical fiber to pass out of the first through hole to pass through; The aperture of the first through hole is d1, and the aperture of the second through hole is d2; Wherein, the ratio of d2 and d1 is less than 0.

5.

4. The fiber optic composite insulator of any one of claims 1-3, wherein, Both ends of the core rod are provided with a limiting groove, and the limiting groove has a limiting surface for limiting the capacitor core in the longitudinal direction; The capacitor core has an abutting surface matched with the limiting surface; When the capacitor core abuts on the corresponding end of the core rod, the capacitor core extends into the limiting groove, and the abutting surface is attached to the limiting surface.

5. The fiber optic composite insulator of claim 4, wherein, The capacitor core is provided with a stepped portion on both sides along the longitudinal direction; The abutting surface is formed on the stepped portion.

6. The fiber optic composite insulator of any one of claims 1-3, wherein, The capacitor core is formed by winding the alternating aluminum foil layer and corrugated paper layer; At least one layer of aluminum foil is arranged in the aluminum foil layer, and at least one layer of corrugated paper is arranged in the corrugated paper layer.

7. The fiber optic composite insulator of claim 6, wherein, The capacitor core is formed by means of epoxy resin pouring and curing.

8. The fiber optic composite insulator of any of claims 1-3, wherein, The capacitor core includes a first core portion, a second core portion and a third core portion connected in sequence along the longitudinal direction; Along the longitudinal direction, the first core portion has a gradually increasing cross-sectional area, and the third core portion has a gradually decreasing cross-sectional area.

9. An optical current measuring device, characterized by The utility model relates to a kind of optical fiber composite insulators, comprising: An insulator body, the insulator body includes a core rod and a sheath wrapped on the core rod; Two connectors, two connectors are respectively arranged at two ends of the core rod along the longitudinal direction;And Two capacitor cores, two capacitor cores are respectively embedded in two ends of the core rod; Wherein, the plane parallel to the longitudinal direction is the reference plane; The connector and the capacitor core located at the same end of the insulator body have overlapping parts in the orthogonal projection on the reference plane; The size of the capacitor core along the longitudinal direction is L1, and the size of the connector along the longitudinal direction is L2; Wherein, the ratio of L1 and L2 is 1-1.

5. The capacitor core has an axial center along the longitudinal direction, and the plane passing through the axial center and perpendicular to the longitudinal direction is the first plane; The connector located at the same end of the capacitor core with the insulator body has a first surface towards the other connector; Wherein, the first plane and the first surface coincide with each other. The core rod is provided with a first through hole along the longitudinal direction for optical fiber to pass through, and the capacitor core is provided with a second through hole along the longitudinal direction for optical fiber to pass out of the first through hole to pass through; The aperture of the first through hole is d1, and the aperture of the second through hole is d2; Wherein, the ratio of d2 and d1 is less than 0.

5. Both ends of the core rod are provided with a limiting groove, and the limiting groove has a limiting surface for limiting the capacitor core in the longitudinal direction; The capacitor core has an abutting surface matched with the limiting surface; When the capacitor core abuts on the corresponding end of the core rod, the capacitor core extends into the limiting groove, and the abutting surface is attached to the limiting surface. The capacitor core is provided with a stepped portion on both sides along the longitudinal direction; The abutting surface is formed on the stepped portion. The capacitor core is formed by winding the alternating aluminum foil layer and corrugated paper layer; At least one layer of aluminum foil is arranged in the aluminum foil layer, and at least one layer of corrugated paper is arranged in the corrugated paper layer. The capacitor core is formed by means of epoxy resin pouring and curing. The capacitor core includes a first core portion, a second core portion and a third core portion connected in sequence along the longitudinal direction; Along the longitudinal direction, the first core portion has a gradually increasing cross-sectional area, and the third core portion has a gradually decreasing cross-sectional area.

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