Flame and fire resistant low voltage power cable containing a shaped conductor
By employing irregularly shaped conductors, multi-layer ceramicized silicone rubber composite tape, and galvanized steel tape structure in the cable, the problems of easy detachment at the splice and failure to pass the spray vibration test in existing flame-retardant and fire-resistant cables have been solved, achieving a cable design with high fire resistance and long service life.
Patent Information
- Application Number
- CN202521848953.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2024-10-17
- Filing Date
- 2025-08-28
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-08-28
AI Technical Summary
Existing flame-retardant and fire-resistant cables are prone to quality problems at the splice joints, have short ablation time, and the mica tape is easy to fall off. They also perform poorly in spray and vibration tests, and are prone to phenomena such as strand skipping and burrs during the stranding of round conductors.
It adopts an irregular conductor structure, and is covered with first, second and third ceramic fireproof and fire-resistant silicone rubber composite tapes and alkali-free fiberglass cloth tapes. It is further covered with galvanized steel tape and halogen-free low-smoke flame-retardant polyolefin sheath on the outer layer, combined with alkali-free fiberglass rope filling and cross-linked polyethylene insulation layer to form a multi-layer protective structure.
It improves the fire resistance, heat insulation and mechanical strength of the cable, and can pass rigorous spray and vibration tests, extending the ablation time, reducing eddy current loss, and increasing current carrying capacity and service life.
Smart Images
Figure CN224682850U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power cable technology, and in particular to a flame-retardant and fire-resistant low-voltage power cable containing irregularly shaped conductors. Background Technology
[0002] With the rapid development of the national economy, flame-retardant and fire-resistant cables have been used in more and more occasions in response to market demand.
[0003] Most fire-resistant cables on the market currently use mica tape wrapped around round conductors. The disadvantages of this method include: poor joint quality at the lap joints, short ablation time, the mica tape becoming brittle and prone to detachment after burning, and inability to pass spray and vibration tests. During the stranding process of the round conductors, issues such as strand skipping, burrs, unevenness, and large gaps between individual wires are prone to occur.
[0004] In view of this, based on the analysis of the current status of flame-retardant and fire-resistant cables at home and abroad, this utility model provides a flame-retardant and fire-resistant low-voltage power cable containing irregularly shaped conductors. Utility Model Content
[0005] To solve the above-mentioned technical problems, this utility model aims to propose a flame-retardant and fire-resistant low-voltage power cable containing irregularly shaped conductors.
[0006] The objective of this utility model is achieved through the following technical solution:
[0007] A flame-retardant and fire-resistant low-voltage power cable containing irregularly shaped conductors is provided, comprising a cable core, wherein the cable core is sequentially covered with a second ceramicized fire-resistant and fire-resistant silicone rubber composite tape, a third ceramicized fire-resistant and fire-resistant silicone rubber composite tape, and an alkali-free fiberglass cloth wrapping tape; the cable core is composed of multiple irregularly shaped conductor assemblies and alkali-free fiberglass ropes disposed between each irregularly shaped conductor assembly; the irregularly shaped conductor assembly includes an irregularly shaped conductor, a first ceramicized fire-resistant and fire-resistant silicone rubber composite tape, and an insulation layer, wherein the first ceramicized fire-resistant and fire-resistant silicone rubber composite tape covers the irregularly shaped conductor, and the insulation layer covers the first ceramicized fire-resistant and fire-resistant silicone rubber composite tape;
[0008] The irregularly shaped conductor includes a central conductor, a plurality of first sector ring conductors arranged around the central conductor, and a plurality of second sector ring conductors arranged around the first sector ring conductors; the plurality of first sector ring conductors are joined together to form a ring that covers the central conductor, and the plurality of second sector ring conductors are joined together to form a ring that covers the first sector ring conductor.
[0009] Among them, alkali-free fiberglass rope can reduce the air content inside the cable core and lower the corresponding combustion temperature under flame combustion conditions.
[0010] Furthermore, the coating thickness of the first ceramicized fireproof and refractory silicone rubber composite tape is 0.2-0.4 mm.
[0011] Preferably, the first ceramicized fireproof and refractory silicone rubber composite tape is covered with 2-3 layers.
[0012] Preferably, the coating thickness of the first ceramicized fireproof and refractory silicone rubber composite tape is 0.2 mm, and the first ceramicized fireproof and refractory silicone rubber composite tape has a total of 2 layers.
[0013] Preferably, the first ceramicized fireproof and fire-resistant silicone rubber composite tape is wrapped around the irregularly shaped conductor.
[0014] Among them, the first ceramicized fireproof and fire-resistant silicone rubber composite tape has a tight overlap, is soft, and has good fireproof and heat insulation effects.
[0015] Furthermore, the insulating layer is a cross-linked polyethylene layer.
[0016] Preferably, the insulating layer is made by extruding irradiated cross-linked polyethylene material, and the temperature resistance of the insulating layer can reach 150°C.
[0017] Furthermore, the alkali-free fiberglass cloth wrapping is covered with galvanized steel strip.
[0018] Among them, the alkali-free fiberglass cloth wrapping can effectively protect the shell of the ceramic fireproof and fire-resistant silicone rubber composite tape from falling off under flame combustion conditions, ensuring the integrity of the shell.
[0019] Furthermore, the coating thickness of the second ceramicized fireproof and refractory silicone rubber composite tape is 0.4-0.6 mm.
[0020] Preferably, the second ceramicized fireproof and fire-resistant silicone rubber composite tape is covered with 2-3 layers.
[0021] Preferably, the second ceramicized fireproof and refractory silicone rubber composite tape has a coating thickness of 0.4 mm, and the second ceramicized fireproof and refractory silicone rubber composite tape has a total of 2 layers.
[0022] Preferably, the second ceramicized fireproof and fire-resistant silicone rubber composite tape is wrapped around the outside of the cable core.
[0023] The second ceramicized fire-resistant and refractory silicone rubber composite tape has an overlap rate of over 20%, is tightly rolled and round, ensuring its integrity under flame combustion conditions, preventing pulverization, and maintaining a hard shell. The second ceramicized fire-resistant and refractory silicone rubber composite tape is a wrapping layer.
[0024] Furthermore, the coating thickness of the third ceramicized fireproof and refractory silicone rubber composite tape is 0.8-1.0 mm.
[0025] Preferably, the third ceramicized fireproof and fire-resistant silicone rubber composite tape is covered with 1-2 layers.
[0026] Preferably, the coating thickness of the third ceramicized fireproof and refractory silicone rubber composite tape is 0.8 mm, and the third ceramicized fireproof and refractory silicone rubber composite tape has a total of 1 layer.
[0027] The third ceramicized fire-resistant and heat-resistant silicone rubber composite tape is an oxygen barrier layer. Under flame combustion conditions, the third ceramicized fire-resistant and heat-resistant silicone rubber composite tape forms a dense oxygen barrier layer, which can prevent the flame from damaging the internal structure of the cable core and ensure the integrity of the cable core. At the same time, it can also reduce the volatilization of flammable gases inside the cable core, thereby lowering the corresponding combustion temperature.
[0028] Furthermore, the galvanized steel strip is covered with a halogen-free, low-smoke, flame-retardant polyolefin sheath.
[0029] The halogen-free, low-smoke, flame-retardant polyolefin sheath uses halogen-free, low-smoke, flame-retardant polyolefin sheath material that meets the standards for oxygen index, smoke density, and crusting properties, and complies with the EU RoHS directive. During flame combustion, there are no obvious burning droplets, achieving the B1 performance rating.
[0030] Furthermore, the galvanized steel strip is a gap-type double steel strip structure, and the gap is no more than 50% of its width.
[0031] The galvanized steel strip mentioned above can ensure the cable's shock resistance, tensile strength, compressive strength, and biological resistance.
[0032] Furthermore, the cross-section of the central conductor is circular, and the cross-sections of the first and second sector-ring conductors are both sector-ring shaped; the inner side of the first sector-ring conductor is in close contact with the surface of the central conductor, and the outer side of the first sector-ring conductor is in close contact with the inner side of the second sector-ring conductor.
[0033] Among them, the irregularly shaped conductor has a large single-wire contact area and low eddy current loss; under the same laying conditions, because the outer diameter of the irregularly shaped conductor structure is smaller than that of the traditional stranded conductor, the overall cable outer diameter is smaller, the cable spacing is larger, the heat dissipation is better, and the current carrying capacity is increased; the conductor appearance is burr-free, the gap between single wires is small, the partial discharge is low, the cable operation failure rate is low, and the cable service life is increased.
[0034] Furthermore, the number of the irregularly shaped conductor components is three, and the irregularly shaped conductor components are arranged in a triangular pattern.
[0035] The advantages compared to existing technologies are:
[0036] This invention provides a flame-retardant and fire-resistant low-voltage power cable containing irregularly shaped conductors. The irregularly shaped conductors feature low eddy current loss, low resistance, and low transmission loss. A first ceramicized fire-resistant silicone rubber composite tape is wrapped around the irregularly shaped conductors, and an extruded and irradiated cross-linked polyethylene insulation layer is formed. The insulation layer has a temperature resistance rating of 180–200°C. Simultaneously, the irregularly shaped conductor components within the cable core are filled with alkali-free fiberglass rope. A second ceramicized fire-resistant silicone rubber composite tape forms a wrapping layer around the cable core, and a third ceramicized fire-resistant silicone rubber composite tape is wrapped on top of this wrapping layer, followed by another alkali-free fiberglass tape. The longer the ablation time and the higher the temperature, the more rigid the shell becomes, resulting in better fire and heat insulation effects, with a maximum temperature exceeding 2800°C. It can also pass the most stringent CWZ level tests, including BS6387 spray and vibration tests. To further improve mechanical impact resistance, biological resistance, tensile strength, and shock resistance, a galvanized steel strip is wrapped around the alkali-free fiberglass tape. At the same time, a halogen-free, low-smoke, flame-retardant polyolefin sheath that meets the standards for oxygen index, smoke density, and crusting properties and complies with the EU RoHS directive is wrapped around the galvanized steel strip. Attached Figure Description
[0037] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0038] Figure 1 This is a schematic diagram of the structure of a flame-retardant and fire-resistant low-voltage power cable containing irregularly shaped conductors according to an embodiment of the present invention;
[0039] Figure 2 This is a schematic diagram of the cable core structure in a flame-retardant and fire-resistant low-voltage power cable containing irregularly shaped conductors, according to an embodiment of this utility model.
[0040] Figure 3 This is a schematic diagram of the irregular conductor assembly in a flame-retardant and fire-resistant low-voltage power cable containing irregular conductors, according to an embodiment of this utility model.
[0041] Figure 4 This is a schematic diagram of the irregularly shaped conductor in a flame-retardant and fire-resistant low-voltage power cable containing an irregularly shaped conductor, according to an embodiment of this utility model.
[0042] Explanation of the markings in the image:
[0043] 1-Irregularly shaped conductor; 2-First ceramicized fire-resistant and refractory silicone rubber composite tape; 3-Insulation layer; 4-Second ceramicized fire-resistant and refractory silicone rubber composite tape; 5-Third ceramicized fire-resistant and refractory silicone rubber composite tape; 6-Alkali-free fiberglass cloth wrapping tape; 7-Alkali-free fiberglass rope; 8-Galvanized steel strip; 9-Halogen-free low-smoke flame-retardant polyolefin sheath; 10-Center conductor; 11-First sector ring conductor; 12-Second sector ring conductor. Detailed Implementation
[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0045] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.
[0046] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.
[0047] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of describing the 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 the invention.
[0048] The terms "parallel" and "perpendicular" do not mean that the components must be absolutely parallel or perpendicular, but rather that they can be slightly tilted. For example, "parallel" simply means that its direction is more parallel than "perpendicular," not that the structure must be completely parallel, but that it can be slightly tilted.
[0049] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0050] In this invention, the low-voltage power cable refers to a power cable with a rated voltage of 0.6 / 1kV.
[0051] Example
[0052] Please see Figure 1-4 The flame-retardant and fire-resistant low-voltage power cable containing irregularly shaped conductors shown includes a cable core, which is sequentially covered with a second ceramicized fire-resistant silicone rubber composite tape 4, a third ceramicized fire-resistant silicone rubber composite tape 5, and an alkali-free fiberglass cloth wrapping tape 6. The cable core is composed of multiple irregularly shaped conductor assemblies and alkali-free fiberglass ropes 7 arranged between each irregularly shaped conductor assembly. The irregularly shaped conductor assembly includes an irregularly shaped conductor 1, a first ceramicized fire-resistant silicone rubber composite tape 2, and an insulation layer 3. The first ceramicized fire-resistant silicone rubber composite tape 2 covers the irregularly shaped conductor 1, and the insulation layer 3 covers the first ceramicized fire-resistant silicone rubber composite tape 2. The irregularly shaped conductor 1 includes a central conductor 10, multiple first fan-shaped ring conductors 11 arranged around the central conductor 10, and multiple second fan-shaped ring conductors 12 arranged around the first fan-shaped ring conductors 11. The multiple first fan-shaped ring conductors 11 are assembled into a ring to cover the central conductor 10, and the multiple second fan-shaped ring conductors 12 are assembled into a ring to cover the first fan-shaped ring conductor 11. Among them, the alkali-free fiberglass rope 7 can reduce the air content inside the cable core and lower the corresponding combustion temperature under flame combustion conditions.
[0053] The first ceramicized fire-resistant and refractory silicone rubber composite tape 2 has a coating thickness of 0.2-0.4 mm. The first ceramicized fire-resistant and refractory silicone rubber composite tape 2 has 2-3 layers. In this embodiment, the coating thickness of the first ceramicized fire-resistant and refractory silicone rubber composite tape 2 is 0.2 mm, and the first ceramicized fire-resistant and refractory silicone rubber composite tape 2 has 2 layers. The first ceramicized fire-resistant and refractory silicone rubber composite tape 2 is wrapped around the irregularly shaped conductor 1. The first ceramicized fire-resistant and refractory silicone rubber composite tape 2 has a tight overlap, is flexible, and has good fire-resistant and heat-insulating effects. The insulating layer 3 is a cross-linked polyethylene layer. The insulating layer 3 is extruded using irradiated cross-linked polyethylene material, and the temperature resistance of the insulating layer 3 can reach 150℃.
[0054] The second ceramicized fire-resistant and heat-resistant silicone rubber composite tape 4 has a coating thickness of 0.4-0.6 mm. The second ceramicized fire-resistant and heat-resistant silicone rubber composite tape 4 has 2-3 layers. In this embodiment, the second ceramicized fire-resistant and heat-resistant silicone rubber composite tape 4 has a coating thickness of 0.4 mm and has 2 layers. The second ceramicized fire-resistant and heat-resistant silicone rubber composite tape 4 is wrapped around the cable core. The overlap rate of the second ceramicized fire-resistant and heat-resistant silicone rubber composite tape 4 is greater than 20%, resulting in a tight and rounded shape, ensuring integrity under flame combustion conditions, preventing pulverization, and maintaining a hard shell. The second ceramicized fire-resistant and heat-resistant silicone rubber composite tape 4 is a wrapping layer. The third ceramicized fire-resistant and heat-resistant silicone rubber composite tape 5 has a coating thickness of 0.8-1.0 mm and has 1-2 layers. In this embodiment, the coating thickness of the third ceramicized fire-resistant and heat-resistant silicone rubber composite tape 5 is 0.8 mm, and the third ceramicized fire-resistant and heat-resistant silicone rubber composite tape 5 consists of one layer. The third ceramicized fire-resistant and heat-resistant silicone rubber composite tape 5 serves as an oxygen barrier layer. Under flame combustion conditions, the third ceramicized fire-resistant and heat-resistant silicone rubber composite tape 5 forms a dense oxygen barrier layer, which can prevent flame damage to the internal structure of the cable core, ensuring the integrity of the cable core, and also reduce the volatilization of flammable gases inside the cable core, thereby lowering the corresponding combustion temperature.
[0055] The alkali-free fiberglass cloth wrapping 6 is covered with a galvanized steel strip 8. Under flame combustion conditions, the alkali-free fiberglass cloth wrapping 6 effectively protects the ceramicized fire-resistant and heat-resistant silicone rubber composite tape shell from detachment, ensuring the integrity of the shell. The galvanized steel strip 8 is covered with a halogen-free, low-smoke, flame-retardant polyolefin sheath 9. The halogen-free, low-smoke, flame-retardant polyolefin sheath 9 uses halogen-free, low-smoke, flame-retardant polyolefin sheath material that meets the standards for oxygen index, smoke density, and crust formation, and complies with the EU RoHS directive. During flame combustion, there are no obvious burning droplets, achieving the B1 performance target. The galvanized steel strip 8 has a gapped double steel strip structure, with the gap not exceeding 50% of its width. The galvanized steel strip 8 ensures the cable's shock resistance, tensile strength, compressive strength, and biological resistance.
[0056] The central conductor 10 has a circular cross-section, and the first sector-ring conductor 11 and the second sector-ring conductor 12 both have sector-ring cross-sections. The inner side of the first sector-ring conductor 11 is tightly fitted to the surface of the central conductor 10, and the outer side of the first sector-ring conductor 11 is tightly fitted to the inner side of the second sector-ring conductor 12. The irregularly shaped conductor 1 has a large single-wire contact area and low eddy current loss. Under the same laying conditions, because the outer diameter of the irregularly shaped conductor 1 is smaller than that of a traditional stranded conductor, the overall cable outer diameter is smaller, the cable spacing is larger, heat dissipation is better, and the current carrying capacity is increased. The conductor has no burrs, the gaps between single wires are small, the partial discharge is low, the cable failure rate is low, and the cable service life is increased. In this embodiment, the number of irregularly shaped conductor assemblies is three, and the irregularly shaped conductor assemblies are arranged in a triangular pattern.
[0057] In summary, this utility model provides a flame-retardant and fire-resistant low-voltage power cable containing irregularly shaped conductors. This low-voltage power cable uses irregularly shaped conductors, which have the characteristics of low eddy current loss, low resistance, and low cable transmission loss. A first ceramicized fire-resistant silicone rubber composite tape is wrapped around the irregularly shaped conductors, and an insulation layer is formed by extrusion-irradiated cross-linked polyethylene. The temperature resistance of the insulation layer can reach 180-200℃. Simultaneously, the irregularly shaped conductor components of the cable core are filled with alkali-free fiberglass rope. A second ceramicized fire-resistant silicone rubber composite tape is wrapped around the cable core to form a wrapping layer, and a third ceramicized fire-resistant silicone rubber composite tape is wrapped on top of this wrapping layer, followed by an alkali-free fiberglass tape. The longer the ablation time and the higher the temperature, the harder the shell becomes, and the better the fire and heat insulation effects, with a maximum temperature exceeding 2800℃. It can also pass the most stringent CWZ level tests currently available, including BS6387 spray and vibration tests. To further improve mechanical impact resistance, biological resistance, tensile strength, and shock resistance, a galvanized steel strip is wrapped around the alkali-free fiberglass tape. At the same time, a halogen-free, low-smoke, flame-retardant polyolefin sheath that meets the standards for oxygen index, smoke density, and crusting properties and complies with the EU RoHS directive is wrapped around the galvanized steel strip.
[0058] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.
Claims
1. A flame-retardant and fire-resistant low-voltage power cable containing an irregularly shaped conductor, characterized in that, The cable core includes a second ceramicized fire-resistant and heat-resistant silicone rubber composite tape, a third ceramicized fire-resistant and heat-resistant silicone rubber composite tape, and an alkali-free fiberglass cloth wrapping tape, all sequentially wrapped around the cable core. The cable core is composed of multiple irregularly shaped conductor assemblies and alkali-free fiberglass ropes disposed between each irregularly shaped conductor assembly. Each irregularly shaped conductor assembly includes an irregularly shaped conductor, a first ceramicized fire-resistant and heat-resistant silicone rubber composite tape, and an insulation layer. The first ceramicized fire-resistant and heat-resistant silicone rubber composite tape wraps around the irregularly shaped conductor, and the insulation layer wraps around the first ceramicized fire-resistant and heat-resistant silicone rubber composite tape. The irregularly shaped conductor includes a central conductor, a plurality of first sector ring conductors arranged around the central conductor, and a plurality of second sector ring conductors arranged around the first sector ring conductors; the plurality of first sector ring conductors are joined together to form a ring that covers the central conductor, and the plurality of second sector ring conductors are joined together to form a ring that covers the first sector ring conductor.
2. The flame-retardant and fire-resistant low-voltage power cable containing irregularly shaped conductors as described in claim 1, characterized in that, The coating thickness of the first ceramicized fireproof and fire-resistant silicone rubber composite tape is 0.2-0.4 mm.
3. The flame-retardant and fire-resistant low-voltage power cable containing irregularly shaped conductors as described in claim 1, characterized in that, The insulating layer is a cross-linked polyethylene layer.
4. The flame-retardant and fire-resistant low-voltage power cable containing irregularly shaped conductors as described in claim 1, characterized in that, The alkali-free fiberglass cloth wrapping is covered with galvanized steel strip.
5. The flame-retardant and fire-resistant low-voltage power cable containing irregularly shaped conductors as described in claim 1, characterized in that, The coating thickness of the second ceramicized fireproof and refractory silicone rubber composite tape is 0.4-0.6 mm.
6. The flame-retardant and fire-resistant low-voltage power cable containing irregularly shaped conductors as described in claim 1, characterized in that, The coating thickness of the third ceramicized fireproof and fire-resistant silicone rubber composite tape is 0.8-1.0 mm.
7. The flame-retardant and fire-resistant low-voltage power cable containing irregularly shaped conductors as described in claim 4, characterized in that, The galvanized steel strip is covered with a halogen-free, low-smoke, flame-retardant polyolefin sheath.
8. The flame-retardant and fire-resistant low-voltage power cable containing irregularly shaped conductors as described in claim 4, characterized in that, The galvanized steel strip is a gap-type double steel strip structure, and the gap is no more than 50% of its width.
9. The flame-retardant and fire-resistant low-voltage power cable containing irregularly shaped conductors as described in claim 1, characterized in that, The cross-section of the central conductor is circular, and the cross-sections of the first and second sector-ring conductors are both sector-ring shaped; the inner side of the first sector-ring conductor is in close contact with the surface of the central conductor, and the outer side of the first sector-ring conductor is in close contact with the inner side of the second sector-ring conductor.
10. The flame-retardant and fire-resistant low-voltage power cable containing irregularly shaped conductors as described in claim 9, characterized in that, The number of irregularly shaped conductor components is three, and the irregularly shaped conductor components are arranged in a triangular pattern.