CN110867315B - Current transformer for series capacitance compensation device - Google Patents
Current transformer for series capacitance compensation device Download PDFInfo
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- CN110867315B CN110867315B CN201911254851.8A CN201911254851A CN110867315B CN 110867315 B CN110867315 B CN 110867315B CN 201911254851 A CN201911254851 A CN 201911254851A CN 110867315 B CN110867315 B CN 110867315B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
- H01F38/30—Constructions
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/02—Casings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/02—Casings
- H01F27/022—Encapsulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/06—Mounting, supporting or suspending transformers, reactors or choke coils not being of the signal type
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a current transformer for a series capacitance compensation device, which comprises a body, an insulating shell arranged outside the body and a silicone rubber jacket; the device body comprises a conducting rod, a secondary coil, a bracket, a secondary cable outgoing line and a branch pipe; the secondary coil comprises an iron core, an enameled wire and an insulating material; the insulating shell comprises a square shell, a first cylindrical shell, a first conical shell, a second cylindrical shell, a second conical shell, a first three-way circular ring, a third cylindrical shell and a second multi-way circular ring. The silicon rubber jacket on the outer surface of the square shell is provided with a square mounting flange, one side of the square shell is provided with two circular bosses, and the periphery of the mounting flange is provided with a square boss. The product of the invention has compact structure, optimized design, stable and reliable performance, higher insulating strength and mechanical strength, can realize three current ratios, can be used in different areas with the altitude of 4500 meters or below by matching with the whole machine, and has high reliability.
Description
Technical Field
The invention relates to a current transformer, in particular to an indoor-outdoor type high-voltage composite insulation current transformer matched with a 10kV novel series capacitance compensation device.
Background
In a long-distance transmission line, the series capacitance compensation device can improve the stable transmission capacity of the system, improve the electrical parameters of the line, offset the influence of the inductance of the line, realize that 2 lines transmit the power of 3 lines, and is an electrical device which can not only improve the transmission power but also save the investment. When the current on the line side reaches or exceeds the limited accurate limit value primary current, the low-voltage side of the current transformer outputs a standard small current signal to be provided for the relay protection device, so that the line is cut off or an alarm is given out. Although the current transformer has more types and models, the current transformer cannot be matched with a series capacitance compensation device for use due to the influence of the structure, the function and the performance of the current transformer. Therefore, at present, no current transformer which can be truly matched with a 10kV novel series capacitance compensation device and is completely matched with the structure is available at home, and the product also needs to be used in different areas with the altitude of 4500 meters or below.
Disclosure of Invention
Aiming at the problems, the invention aims to provide the current transformer which has the advantages of brand new structural form, compact structure, optimized design, stable and reliable performance, higher insulating strength and mechanical strength and capability of realizing three current ratios. The invention has the advantages of convenient installation, pollution flashover resistance, maintenance-free and long service life, and the matched whole machine can be used in different areas with the altitude of 4500 meters or below, and has high reliability.
In order to achieve the above purpose, the invention adopts the following technical scheme: the current transformer for the series capacitance compensation device is characterized by comprising a body, an insulating shell arranged outside the body and a silicone rubber jacket; the device body comprises a conducting rod, a secondary coil, a bracket, a secondary cable outgoing line and a branch pipe; the secondary coil comprises an iron core, an enameled wire and an insulating material; the center of the insulating shell is a square shell, a first cylindrical shell extends out of one side of the square shell by taking a transverse shaft as the center, a first conical shell extends out of one side of the first cylindrical shell, and a second cylindrical shell extends out of one side of the first conical shell; meanwhile, a conical shell II extends out of the other side of the square shell by taking the transverse axis as the center, and a cylindrical shell III extends out of one side of the conical shell II; three circular rings I which are longitudinally parallel to the square shell and have equal intervals are arranged on the second conical shell, and a plurality of circular rings II which are longitudinally parallel to the circular rings I, have equal intervals and have the same outer diameter are arranged on the third cylindrical shell; the square shell, the first cylindrical shell, the first conical shell, the second cylindrical shell, the second conical shell, the first three circular rings, the third cylindrical shell and the second plurality of circular rings form an integral insulating shell which is cast by epoxy resin in vacuum, and a silicone rubber jacket is injected on the outer surfaces of the square shell, the first cylindrical shell, the first conical shell and the second cylindrical shell.
The square mounting flange is arranged on the silicon rubber jacket on the outer surface of the square shell, two circular annular bosses are arranged on one side of the square mounting flange with the mounting flange as the center, square bosses are arranged on the periphery of the mounting flange, and counter bores are formed in corners of the mounting flange.
The secondary coil is fixed on the support, the support is arranged in the cube shell, and the branch pipes penetrate through the counter bores and are inlaid in four elliptical holes of the support.
The iron core is a circular iron core which is formed by rolling high-permeability silicon steel sheets and is subjected to heat treatment, and an ultracrystalline alloy layer is arranged on the inner wall of the circular iron core.
Further, the first three circular rings respectively take the transverse axis of the square shell as the center, take the circle as the track, and the cross section of the first three circular rings intersecting with the outer surface of the second conical shell is in a sector shape.
Further, the diameters of the first three circles are 90mm, 80mm and 70mm respectively.
Further, the second circular rings respectively take the transverse axis of the cylindrical shell as the center, take the circle as the track, and the cross section of the second circular rings intersecting with the outer surface of the cylindrical shell is in a sector shape.
Further, a plurality of large sheds and a plurality of small sheds which are parallel to the cube and have the same interval are arranged on the silicon rubber jacket on the second outer surface of the cylindrical shell.
Further, the silicone rubber jacket is formed by injecting high-temperature vulcanized silicone rubber, and a grounding screw and a P1 mark are further arranged on the silicone rubber jacket.
Further, the conducting rod is arranged at the center of the transverse shaft of the insulating shell, is centered and penetrates through the inner diameter of the secondary coil, an M20 stud is arranged at one end of the conducting rod, and an M12 screw hole is formed in the other end face of the conducting rod.
Further, the secondary coil is provided with two intermediate taps, and four terminal marks S1, S2, S3, S4 are led out through cables.
Further, the bracket and the branch pipe are made of metal materials.
The invention takes a mounting flange part as a boundary, wherein one side is in composite insulation, the other side is in epoxy resin vacuum casting insulation, and the composite insulation part is arranged on an outgoing line side outside a 10kV series capacitance compensation device and is fixed on a shell, wherein the composite insulation part is exposed outside the shell, the epoxy resin casting part is arranged inside the shell, and a low-voltage side outputs a current signal for a relay protection device.
Compared with the prior art, the invention has the advantages that:
the product of the invention has the advantages of simple structure, strong sealing performance, high insulating strength and mechanical strength, timely, accurate and reliable output current signal, strong anti-interference capability and the like. The device can meet the use requirements of different areas with the altitude of 4500 meters and below by on-site test after being assembled with a complete machine, and has high reliability.
(1) The structure of the product is the only structure which can be matched with the serial capacitance compensation device at present when the product is matched with the serial capacitance compensation device, and the first conical shell and the second conical shell are respectively arranged on two sides of the square shell, so that the insulating strength is enhanced, the discharge of the conductive rod to the mounting flange when the product is used in high-altitude areas is prevented, and the integral mechanical strength of the product can be further enhanced.
(2) The secondary coil is fixed on the support, and the conducting rod is worn in the middle of the secondary coil internal diameter, forms a complete ware body, and the ware body is fixed on insulating housing, and insulating housing adopts epoxy vacuum casting to form, and this design makes the structure of product compacter to fully ensure that the product has higher insulating strength and mechanical strength.
(3) The iron core adopts double combination of the silicon steel sheet annular iron core and the ultracrystalline alloy layer, thereby not only meeting the magnetic conduction characteristic of the circuit under the condition of small current, improving the saturation characteristic of the iron core of the circuit under the condition of overcurrent, ensuring accurate and timely output signal response, stable and reliable performance, and having the characteristics of strong anti-interference capability, long service life and the like.
(4) The design of the silicon rubber jacket and the big umbrella skirt is adopted on one side of the mounting flange, the circular ring boss and the square boss are arranged on the plane on the other side of the mounting flange, and the circular rings with different outer diameters are designed, so that after the whole machine is mounted in place, the sealing is tight, meanwhile, the creepage distance along the surface is increased, the pollution grade is ensured to reach the standard above grade IV (31 mm/kV), and the use requirements of outdoor operation and severe pollution areas are met.
(5) The secondary coil is provided with two taps, and the design ensures that the whole machine has 3 current ratios, has a one-machine multi-purpose principle and also provides guarantee for capacity increase of a user system of the power system in the future.
(6) The square mounting flange is arranged on the silicon rubber jacket on the outer surface of the square shell, two circular ring-shaped bosses are arranged on one side of the mounting flange, and square bosses are arranged on the periphery of the mounting flange.
(7) The secondary coil is fixed on the bracket, the branch pipes penetrate through the counter bores and are embedded in the four elliptical holes of the bracket, and the bracket is arranged in the cube shell; the support is arranged in the cube shell, so that the mechanical strength of the mounting flange is enhanced, meanwhile, the branch pipes penetrate through the counter bores and are embedded in four elliptical holes of the support, when the support is assembled with the whole machine in a matched mode, fastening connection is ensured between metal pieces, the non-metal surfaces are prevented from being damaged, and meanwhile, the mechanical strength of the mounting flange is further enhanced.
Drawings
FIG. 1 is a schematic diagram of a product structure according to a first embodiment of the present invention;
FIG. 2 is a right side perspective view of FIG. 1;
FIG. 3 is a front cross-sectional view of FIG. 1;
FIG. 4 is a side cross-sectional view of FIG. 3;
FIG. 5 is a right side view of FIG. 3;
FIG. 6 is a schematic diagram of a product structure according to a second embodiment of the present invention;
FIG. 7 is a right side perspective view of FIG. 6;
FIG. 8 is a front cross-sectional view of FIG. 6;
fig. 9 is an electrical schematic of the present invention.
In the figure: 1. the cable comprises an insulating shell, 1-1, a square shell, 1-2, a cylindrical shell I, 1-3, a conical shell I, 1-4, a cylindrical shell II, 1-5, a conical shell II, 1-6, a circular ring I, 1-7, a cylindrical shell III, 1-8, a circular ring II, 2, a silicone rubber jacket, 2-1, a mounting flange, 2-1-1, a circular ring-shaped boss, 2-1-2, a square boss, 2-1-3, a counter bore, 2-2, a large umbrella skirt, 2-3, a small umbrella skirt, 2-4, a grounding screw, 2-5, a P1 mark, 3, a body, 3-1, a conducting rod, 3-1, a M20 stud, 3-1-2, a M12 screw hole, 3-2, a secondary coil, 3-3, a bracket, 3-4, a cable outgoing line, 3-5 and a branch pipe.
Detailed Description
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
Embodiment one:
as shown in fig. 1, 2, 3, 4, 5, a current transformer for a series capacitance compensation device includes a body 3, an insulating case 1 provided outside the body 3, and a silicone rubber cover 2.
The device body 3 comprises a conductive rod 3-1, a secondary coil 3-2, a bracket 3-3, a secondary cable outgoing line 3-4 and a branch pipe 3-5; the secondary coil 3-2 comprises an iron core 3-2-1, enameled wires and insulating materials; the iron core 3-2-1 is a circular iron core which is formed by rolling high-permeability silicon steel sheets and is subjected to heat treatment, and an ultracrystalline alloy layer is arranged on the inner wall of the circular iron core; the secondary coil 3-2 is fixed on the support 3-3, the support 3-3 is arranged in the square shell 1-1, the branch pipes 3-5 penetrate through the counter bores 2-1-3 and are embedded in four elliptical holes of the support 3-3, and the support 3-3 and the branch pipes 3-5 are made of metal materials. The secondary coil 3-2 is provided with two intermediate taps, and four terminal marks S1, S2, S3, S4 are led out through cables.
The center of the insulating shell 1 is a square shell 1-1, a cylindrical shell 1-2 extends out of one side of the square shell 1-1 by taking a transverse axis as the center, a conical shell 1-3 extends out of one side of the cylindrical shell 1-2, and a cylindrical shell 2-4 extends out of one side of the conical shell 1-3. Meanwhile, a second conical shell 1-5 extends out of the other side of the square shell 1-1 by taking the transverse axis as the center, and a third cylindrical shell 1-7 extends out of one side of the second conical shell 1-5; the conical shell II 1-5 is provided with three circular rings 1-6 which are longitudinally parallel to the square shell 1-1, have equal intervals and have diameters of 90mm, 80mm and 70mm, and the three circular rings 1-6 are respectively in sector shapes after intersecting with the outer surface of the conical shell II 1-5 by taking the transverse axis of the square shell 1-1 as the center and taking the circle as the track. Seven circular rings 1-8 which are longitudinally parallel to the circular rings 1-6, have equal intervals and have the same outer diameter are arranged on the cylindrical shell three 1-7; the seven circular rings 1-8 take the transverse shafts of the cylindrical shells three 1-7 as centers, take the circles as tracks, and the cross sections of the seven circular rings intersecting with the outer surfaces of the cylindrical shells three 1-7 are fan-shaped.
The square shell 1-1, the cylindrical shell 1-2, the conical shell 1-3, the cylindrical shell 1-4, the conical shell 1-5, the three circular rings 1-6, the cylindrical shell three 1-7 and the seven circular rings 1-8 form an integral insulating shell 1 which is vacuum-cast by epoxy resin, and the outer surfaces of the square shell 1-1, the cylindrical shell 1-2, the conical shell 1-3 and the cylindrical shell 1-4 are injected with a silicon rubber jacket 2. The square mounting flange 2-1 is arranged on the silicon rubber jacket 2 on the outer surface of the square shell 1-1, two circular annular bosses 2-1-1 are arranged on one side of the square mounting flange 2-1 by taking the mounting flange 2-1 as the center, square bosses 2-1-2 are arranged on the periphery of the mounting flange 2-1, and counter bores 2-1-3 are arranged at the corners of the mounting flange. The silicone rubber jacket 2 on the outer surface of the cylindrical shell II 1-4 is provided with five large sheds 2-2 and four small sheds 2-3 which are parallel to the cube and have the same interval.
In the embodiment, the silicone rubber jacket 2 is formed by injecting high-temperature vulcanized silicone rubber, and the grounding screw 2-4 and the P1 mark 2-5 are also arranged on the silicone rubber jacket 2.
In this embodiment, the conductive rod 3-1 is disposed at the center of the transverse axis of the insulating housing 1, and is centered and centered on the inner diameter of the secondary coil 3-2, one end of the conductive rod 3-1 is provided with an M20 stud 3-1-1, and the other end of the conductive rod 3-1 is provided with an M12 screw hole 3-1-2.
The product of the embodiment is suitable for areas with the altitude below 2500 meters.
Embodiment two:
as shown in fig. 1, 2, 3, 4, 5, a current transformer for a series capacitance compensation device includes a body 3, an insulating case 1 provided outside the body 3, and a silicone rubber cover 2.
The device body 3 comprises a conductive rod 3-1, a secondary coil 3-2, a bracket 3-3, a secondary cable outgoing line 3-4 and a branch pipe 3-5; the secondary coil 3-2 comprises an iron core 3-2-1, enameled wires and insulating materials; the iron core 3-2-1 is a circular iron core which is formed by rolling high-permeability silicon steel sheets and is subjected to heat treatment, and an ultracrystalline alloy layer is arranged on the inner wall of the circular iron core; the secondary coil 3-2 is fixed on the bracket 3-3, the bracket 3-3 is arranged in the square shell 1-1, and the branch pipes 3-5 penetrate through the counter bores 2-1-3 and are embedded in four elliptical holes of the bracket 3-3; the secondary coil 3-2 is provided with two intermediate taps, and four terminal marks S1, S2, S3, S4 are led out through cables.
The center of the insulating shell 1 is a square shell 1-1, a cylindrical shell 1-2 extends out of one side of the square shell 1-1 by taking a transverse axis as the center, a conical shell 1-3 extends out of one side of the cylindrical shell 1-2, and a cylindrical shell 2-4 extends out of one side of the conical shell 1-3. Meanwhile, a second conical shell 1-5 extends out of the other side of the square shell 1-1 by taking the transverse axis as the center, and a third cylindrical shell 1-7 extends out of one side of the second conical shell 1-5; the conical shell II 1-5 is provided with three circular rings 1-6 which are longitudinally parallel to the square shell 1-1, have equal intervals and have diameters of 90mm, 80mm and 70mm, and the three circular rings 1-6 are respectively in sector shapes after intersecting with the outer surface of the conical shell II 1-5 by taking the transverse axis of the square shell 1-1 as the center and taking the circle as the track. Seven circular rings 1-8 which are longitudinally parallel to the circular rings 1-6, have equal intervals and have the same outer diameter are arranged on the cylindrical shell three 1-7; the nine circular rings 1-8 are respectively centered on the transverse shafts of the cylindrical shells three 1-7, take circles as tracks, and the cross sections of the nine circular rings intersecting with the outer surfaces of the cylindrical shells three 1-7 are sector-shaped.
The square shell 1-1, the cylindrical shell 1-2, the conical shell 1-3, the cylindrical shell 1-4, the conical shell 1-5, the three circular rings 1-6, the cylindrical shell three 1-7 and the nine circular rings 1-8 form an integral insulating shell 1 which is vacuum-cast by epoxy resin, and the outer surfaces of the square shell 1-1, the cylindrical shell 1-2, the conical shell 1-3 and the cylindrical shell 1-4 are injected with a silicon rubber jacket 2. The square mounting flange 2-1 is arranged on the silicon rubber jacket 2 on the outer surface of the square shell 1-1, two circular annular bosses 2-1-1 are arranged on one side of the square mounting flange 2-1 by taking the mounting flange 2-1 as the center, square bosses 2-1-2 are arranged on the periphery of the mounting flange 2-1, and counter bores 2-1-3 are arranged at the corners of the mounting flange. Six large sheds 2-2 and five small sheds 2-3 which are parallel to the cube and have the same interval are arranged on the silicon rubber jacket 2 on the outer surface of the cylindrical shell II 1-4.
In the embodiment, the silicone rubber jacket 2 is formed by injecting high-temperature vulcanized silicone rubber, and the grounding screw 2-4 and the P1 mark 2-5 are also arranged on the silicone rubber jacket 2.
In this embodiment, the conductive rod 3-1 is disposed at the center of the transverse axis of the insulating housing 1, and is centered and centered on the inner diameter of the secondary coil 3-2, one end of the conductive rod 3-1 is provided with an M20 stud 3-1-1, and the other end of the conductive rod 3-1 is provided with an M12 screw hole 3-1-2.
The product of the embodiment is suitable for areas with the altitude of 2500-4500 meters.
Working principle: during assembly of the whole machine, the current transformer is arranged on the outgoing line side of the 10kV series capacitance compensation device, the silicone rubber jacket 2 is exposed outside the shell, the P1 mark 2-5 faces outwards, the annular boss 2-1-1 and the square boss 2-1-2 on the outer edge surface of the mounting flange 2-1 are tightly attached to the limiting position of the shell, the part below the mounting flange 2-1 penetrates into a reserved through hole of the shell, and is fixed on the shell through the counter bore 2-1-3 by bolts, and a complete sealing butt joint function is formed by dividing the parts into A, B, C three phases. Meanwhile, M12 screw holes 3-1-2 extending into the shell are fixed on a preset copper bar, the cable outgoing lines 3-4 are connected to the relay protection device, the grounding terminals 2-4 are required to be grounded reliably, the rated current value of the bus on the line side is required to be determined under the conditions that all electric connections are correct and the fastening and sealing are reliable, and then, which two secondary terminal leads are selected to be connected to the relay protection device is further determined. After the inlet and outlet wires of the complete machine device are respectively connected to the three-phase bus of the power system A, B, C, as shown in fig. 9, the complete machine device outputs a standard small current signal through the cable outgoing wires 3-4 to be provided for the relay protection device according to the electromagnetic induction principle, so that the complete machine device is convenient and quick to install, compact in structure, tight in matching, reliable in sealing, accurate and reliable in overcurrent protection, stable in performance, and suitable for being used in areas with the altitude of 4500 m and below and meeting severe pollution.
The indoor-outdoor high-voltage composite insulating current transformer is mainly applied to and installed on an outlet shell of a novel series capacitance compensation device, and when the line side current reaches or exceeds a limited accurate limit value primary current, a low-voltage side output standard small current signal is provided for a relay protection device to cut off a line or alarm. The invention provides a new thought for installing a current transformer on a shell of an outlet side of a series capacitance compensation device at home and abroad, on the basis of which a new method for magnetic field and electric field signal transmission mechanism, anti-interference principle and the like are researched, and simultaneously, a new thought and a new method for increasing the double combination of a super-microcrystalline alloy layer on the inner wall of a rolled iron core of a silicon steel sheet after heat treatment are researched, so that the cross section of the iron core is improved, the magnetic conductivity of the iron core of the current transformer is improved, the saturation voltage is improved, and key technologies such as the magnetic conductivity width of the iron core, the measurement and protection range and the like are improved.
The above examples of the present invention are only illustrative of the present invention and are not intended to limit the embodiments of the present invention. Other variations or modifications of the above description will be apparent to those of skill in the art. It is not necessary or obvious to describe every implementation of the invention but rather to introduce obvious variations or modifications which are within the spirit and scope of the present invention.
Claims (7)
1. A current transformer for a series capacitance compensation device, which is characterized by comprising a body (3), an insulating shell (1) arranged outside the body (3), and a silicone rubber jacket (2); the device body (3) comprises a conducting rod (3-1), a secondary coil (3-2), a bracket (3-3), a secondary cable outgoing line (3-4) and a branch pipe (3-5); the secondary coil (3-2) comprises an iron core (3-2-1), enameled wires and insulating materials; the center of the insulating shell (1) is a square shell (1-1), a first cylindrical shell (1-2) extends out of one side of the square shell (1-1) by taking a transverse axis as the center, a first conical shell (1-3) extends out of one side of the first cylindrical shell (1-2), and a second cylindrical shell (1-4) extends out of one side of the first conical shell (1-3); a second conical shell (1-5) extends out of the square shell (1-1) at the other side of the square shell (1-1) by taking the transverse axis as the center, and a third cylindrical shell (1-7) extends out of one side of the second conical shell (1-5); three circular rings I (1-6) which are longitudinally parallel to the square shell (1-1) and have equal intervals are arranged on the conical shell II (1-5), and a plurality of circular rings II (1-8) which are longitudinally parallel to the circular rings I (1-6), have equal intervals and have the same outer diameter are arranged on the cylindrical shell III (1-7); the square shell (1-1), the cylindrical shell I (1-2), the conical shell I (1-3), the cylindrical shell II (1-4), the conical shell II (1-5), the three circular rings I (1-6), the cylindrical shell III (1-7) and the plurality of circular rings II (1-8) form an integral insulating shell (1) which is vacuum-cast by epoxy resin, and a silicon rubber jacket (2) is injected on the outer surfaces of the square shell (1-1), the cylindrical shell I (1-2), the conical shell I (1-3) and the cylindrical shell II (1-4);
the square-shaped silicon rubber casing is characterized in that a square-shaped mounting flange (2-1) is arranged on a silicon rubber jacket (2) on the outer surface of the square-shaped casing (1-1), two circular annular bosses (2-1-1) are arranged on one side of the square-shaped mounting flange, square bosses (2-1-2) are arranged on the periphery of the mounting flange (2-1), counter bores (2-1-3) are formed in corners of the mounting flange, the secondary coil (3-2) is fixed on the support (3-3), the support (3-3) is arranged in the square-shaped casing (1-1), and branch pipes (3-5) penetrate through the counter bores (2-1-3) and are embedded in four elliptical holes of the support (3-3); the iron core (3-2-1) is a circular iron core which is formed by rolling high-permeability silicon steel sheets and is subjected to heat treatment, and an ultracrystalline alloy layer is arranged on the inner wall of the circular iron core;
the current transformer is arranged on the outgoing line side of the series capacitance compensation device, the silicon rubber jacket 2 is exposed outside the shell, the annular boss 2-1-1 and the square boss 2-1-2 on the outer edge surface of the mounting flange 2-1 are tightly attached to the limiting position of the shell, the part below the mounting flange 2-1 penetrates into a reserved through hole of the shell, the current transformer is fixed on the shell through a counter bore 2-1-3 by adopting a bolt, and an M12 screw hole 3-1-2 extending into the shell is fixed on a preset copper bar;
the three circular rings I (1-6) are respectively centered on the transverse axis of the square shell (1-1), take a circle as a track, and have a sector-shaped cross section after intersecting with the outer surface of the conical shell II (1-5); the multi-channel circular rings II (1-8) are respectively centered on the transverse axis of the cylindrical shell III (1-7), take circles as tracks, and the cross section of the circular rings II after intersecting with the outer surface of the cylindrical shell III (1-7) is fan-shaped.
2. The current transformer for a series capacitance compensation device according to claim 1, wherein the diameters of the three circular rings 1-6 are 90mm, 80mm, 70mm, respectively.
3. A current transformer for a series capacitance compensation device according to claim 1 or 2, wherein a plurality of large sheds (2-2) and a plurality of small sheds (2-3) which are parallel to a cube and have the same interval are arranged on a silicone rubber outer sleeve (2) on the outer surface of the cylindrical shell two (1-4).
4. A current transformer for a series capacitance compensation device according to claim 3, wherein the silicone rubber jacket (2) is formed by injection of high temperature vulcanized silicone rubber, and the silicone rubber jacket (2) is further provided with a grounding screw (2-4), and a P1 mark (2-5).
5. The current transformer for the series capacitance compensation device according to claim 4, wherein the conductive rod (3-1) is arranged at the center of the transverse shaft of the insulating housing (1), is centered and penetrates through the inner diameter of the secondary coil (3-2), one end of the conductive rod (3-1) is provided with an M20 stud (3-1-1), and the other end face of the conductive rod (3-1) is provided with an M12 screw hole (3-1-2).
6. A current transformer for a series capacitance compensation device according to claim 5, characterized in that the secondary coil (3-2) is provided with two intermediate taps, four terminal marks S1, S2, S3, S4 being led out through cables.
7. A current transformer for a series capacitance compensation device according to claim 1, characterized in that the bracket (3-3) and the branch pipe (3-5) are both made of metal material.
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| CN201911254851.8A CN110867315B (en) | 2019-12-10 | 2019-12-10 | Current transformer for series capacitance compensation device |
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| CN110867315B true CN110867315B (en) | 2023-05-16 |
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| CN112848061A (en) * | 2020-12-17 | 2021-05-28 | 浙江浦泰高压电气有限公司 | Processing technology of outdoor transformer bushing |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1366077A (en) * | 1971-10-26 | 1974-09-11 | Beckett & Parker | Current transformer assemblies |
| CN102957122A (en) * | 2012-12-20 | 2013-03-06 | 沈阳华利能源设备制造有限公司 | Solid insulated sleeve with inserting type connection |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203367912U (en) * | 2013-05-29 | 2013-12-25 | 大连北方互感器集团有限公司 | High-voltage compound insulation wall bushing for box-type circuit breaker |
| CN203366982U (en) * | 2013-07-25 | 2013-12-25 | 大连北方互感器集团有限公司 | Current transformer for high-voltage static reactive compensation device |
| CN209357607U (en) * | 2018-12-20 | 2019-09-06 | 大连北方互感器集团有限公司 | Wall-penetrating type Full-closed current transformer |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1366077A (en) * | 1971-10-26 | 1974-09-11 | Beckett & Parker | Current transformer assemblies |
| CN102957122A (en) * | 2012-12-20 | 2013-03-06 | 沈阳华利能源设备制造有限公司 | Solid insulated sleeve with inserting type connection |
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Effective date of registration: 20230426 Address after: 415001 Six Groups of Chongde Residential Committee of Deshan Town, Changde Economic and Technological Development Zone, Hunan Province Applicant after: HUNAN DA EACH TRANSFORMER CO.,LTD. Applicant after: DALIAN NORTH INSTRUMENT TRANSFORMER GROUP Co.,Ltd. Address before: 415001 Six Groups of Chongde Residential Committee of Deshan Town, Changde Economic and Technological Development Zone, Hunan Province Applicant before: HUNAN DA EACH TRANSFORMER CO.,LTD. |
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