Five-winding type coil structure of capacitor voltage transformer

Abstract

The utility model relates to a five-winding type coil structure of a capacitor voltage transformer, which comprises a secondary coil, the secondary coil comprises five windings, outgoing lines at the two ends of a first winding of the secondary coil, outgoing lines at the two ends of a third winding of the secondary coil and outgoing lines at the dn ends of the remaining windings of the secondary coil are led out from one side of the secondary coil, outgoing lines at the two ends of a second winding of the secondary coil, outgoing lines at the two ends of a fourth winding and outgoing lines at the da ends of the remaining windings are led out from the other side of the secondary coil, the secondary coil is arranged in the primary coil, a connecting plate is arranged above the primary coil in the radial direction, and a secondary terminal base and a wire outlet hole are arranged on the connecting plate. Wherein outgoing lines of the secondary coil are respectively connected with corresponding terminals on the secondary terminal seat, and outgoing lines of the primary coil respectively penetrate through corresponding outgoing line holes. According to the secondary coil disclosed by the utility model, the arrangement of five windings is realized, and the outgoing lines of the windings are led out from the two sides of the secondary coil in equal quantity, so that not only is the lead connection convenient, but also the installation space occupied by the outgoing lines of the leads can be reduced.

Description

Technical Field

[0001] The utility model relates to the field of capacitive voltage transformers, and specifically relates to a five-winding coil structure of a capacitive voltage transformer. Background Art

[0002] A capacitive voltage transformer mainly consists of a capacitive voltage divider and an electromagnetic unit. It generally includes 1 to 4 windings and is mainly used for voltage measurement, electric energy metering, relay protection, etc. For example, a patent with the authorization announcement number CN202258753U discloses a capacitive voltage transformer, in which the electromagnetic unit is provided with four independent secondary windings, namely a secondary winding for metering, a secondary winding for measurement, a secondary winding for protection, and a residual voltage winding.

[0003] However, with the development of technology, customers' requirements are getting higher and higher. For example, some customers have put forward the requirement of five windings. The arrangement of the primary coil and the secondary coil in the electromagnetic unit has become a mature structure, where the primary coil is on the outside and the secondary coil is on the inside. For example, a patent with the authorization announcement number CN217061736U discloses an insulating structure of an intermediate transformer of a capacitive voltage transformer. When winding, the secondary coil is first wound on an inner insulating cardboard. After the secondary coil is wound, an insulating layer (this structure includes an insulating layer and an insulating cardboard) is wound on the secondary coil, and then the primary coil is wound on the insulating layer. If the transformer is changed to a five-winding structure, it will increase the arrangement number of the secondary coils in the inner layer and the number of lead-out heads, and at the same time, it will also affect the outer primary coil. Therefore, it is necessary to adjust the arrangement method of the secondary coils and the wiring method of the outgoing lines.

[0004] The existing secondary coil outgoing line structure includes structures such as a secondary terminal box. For example, a patent with the authorization announcement number CN221199775U discloses a low-voltage lead-out structure for a capacitive voltage transformer, which includes a secondary terminal box, an isolation support assembly, a low-voltage lead, and a nut assembly. The isolation support assembly includes an insulating isolation block, an upper bolt, and a lower bolt. However, the design purpose of this structure is to independently arrange the low-voltage lead, thereby improving the withstand voltage level of the insulation between terminals and being beneficial to the safe operation of the product. And a patent with the authorization announcement number CN218351264U discloses a capacitive voltage transformer, which includes an intermediate transformer, a connecting plate, etc. The connecting plate consists of a base, an adjusting plate, a spring, a moving plate, a DC electromagnet, etc., and the adjusting plate includes a first wiring plate with terminals and other structures to realize connection with the base terminals. But the purpose of designing the connecting plate of this device is that: the connecting plate is connected to the intermediate transformer to adjust the working frequency of the capacitive voltage transformer according to the voltage frequency, and the compensation reactor is connected to the connecting plate to adjust the reactance value in the circuit according to the terminals of the connecting plate. Summary of the Utility Model

[0005] The purpose of the present utility model is to provide a five-winding coil structure for a capacitive voltage transformer, wherein the secondary coil includes five windings, and the leads of each winding are led out in equal numbers from both sides of the secondary coil and connected to a secondary terminal block provided above the primary coil in the radial direction. The present utility model is convenient for lead connection, can reduce the installation space occupied by the lead-out wires, and can also improve the electric field distribution at the lead-out wire arrangement of the secondary coil.

[0006] The purpose of the present utility model is achieved through the following technical solutions:

[0007] A five-winding coil structure for a capacitive voltage transformer includes a secondary coil, and the secondary coil includes a first winding, a second winding, a third winding, a fourth winding, and a remaining winding. The leads at both ends of the first winding, the leads at both ends of the third winding, and the dn end lead of the remaining winding are led out from one side of the secondary coil, and the leads at both ends of the second winding, the leads at both ends of the fourth winding, and the da end lead of the remaining winding are led out from the other side of the secondary coil. The secondary coil is arranged in the primary coil, and a connecting plate is provided above the primary coil in the radial direction. The connecting plate is provided with a secondary terminal block and lead-out holes. The leads at both ends of the first winding, the leads at both ends of the second winding, the leads at both ends of the third winding, the leads at both ends of the fourth winding, and the leads at both ends of the remaining winding are respectively connected to the corresponding terminals on the secondary terminal block, and the leads of the primary coil pass through the corresponding lead-out holes respectively.

[0008] The remaining winding, the fourth winding, the third winding, the second winding, and the first winding are arranged in sequence from the inside to the outside.

[0009] A shielding ring is provided outside the first winding.

[0010] The primary coil is arranged in an electromagnetic unit seat body, and a plurality of support columns are provided on the upper side of the electromagnetic unit seat body. The connecting plate is installed on the support columns.

[0011] Two fastening nuts are provided at the upper ends of the support columns, and the connecting plate is clamped and fixed by the two fastening nuts.

[0012] The advantages and positive effects of the present utility model are as follows:

[0013] 1. The secondary coil of the present utility model has a five-winding structure, and the leads of each winding are led out in equal numbers from both sides of the secondary coil. Except that the head and tail ends of the remaining winding are respectively led out from both sides of the secondary coil, the lead-out ends of the remaining adjacent windings are not on the same side. In this way, in addition to ensuring that the head and tail of a single winding are on the same side of the secondary coil for convenient lead-out and connection, the space utilization rate of the single-layer coil can be maximized, and the installation space occupied by the lead-out wires can also be reduced, thereby ensuring the overall compact structure of the equipment.

[0014] 2. In addition to leading out the secondary coil leads from both sides in equal numbers and connecting them to the secondary terminal block, the present utility model also arranges the leads of the primary coil with higher potential separately on the connecting plate supporting the secondary terminal block. This can keep the high-potential part away from the secondary output terminals, thereby preventing the influence on the product performance caused by discharge short circuit between adjacent terminals due to excessive field strength. At the same time, it can also reduce the deformation amount of the connecting spring when the primary coil is connected to the bottom of the intermediate voltage bushing of the capacitor voltage divider, and improve the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a structural schematic diagram of the present utility model,

[0016] Figure 2 for Figure 1 is a structural schematic diagram of the secondary coil in

[0017] Figure 3 for Figure 2 is a left view of the secondary coil in

[0018] Figure 4 for Figure 1 is a structural schematic diagram of the primary coil in

[0019] Figure 5 for Figure 4 is a left view of the primary coil in

[0020] Figure 6 for Figure 1 is a top view of the secondary terminal block in

[0021] Figure 7 for Figure 6 is an overall structural schematic diagram of the connecting plate in

[0022] Among them, 1 is the secondary coil, 101 is the first winding, 102 is the second winding, 103 is the third winding, 104 is the fourth winding, 105 is the remaining winding, 106 is the shielding ring, 2 is the primary coil, 201 is the primary coil skeleton, 202 is the lead A of the primary winding, 203 is the lead B of the primary winding, 3 is the support column, 301 is the fastening nut, 4 is the connecting plate, 401 is the wire outlet hole, 5 is the secondary terminal block, and 6 is the electromagnetic unit seat body. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The present utility model will be further described in detail below with reference to the drawings.

[0024] As Figures 1 to 7 shown, the present utility model includes a secondary coil 1, and as Figure 2As shown, the secondary coil 1 includes a first winding 101, a second winding 102, a third winding 103, a fourth winding 104, and a remaining winding 105. The leads at both ends of the first winding 101 (1n and 1a), the leads at both ends of the third winding 103 (3n and 3a), and the dn lead of the remaining winding 105 are led out from one side of the secondary coil 1. The leads at both ends of the second winding 102 (2n and 2a), the leads at both ends of the fourth winding 104 (4n and 4a), and the da lead of the remaining winding 105 are led out from the other side of the secondary coil 1. The secondary coil 1 is disposed in the primary coil 2 (this is a well-known technology in the art, for example, see patents such as CN217061736U), and as Figure 1 shown, a connection plate 4 is provided above the primary coil 2 in the radial direction, as Figures 6 to 7 shown, the connection plate 4 is provided with a secondary terminal block 5 and two wire outlet holes 401. The leads at both ends of the first winding 101, the leads at both ends of the second winding 102, the leads at both ends of the third winding 103, the leads at both ends of the fourth winding 104, and the leads at both ends of the remaining winding 105 are respectively connected to the corresponding terminals on the secondary terminal block 5. The leads of the primary coil 2 pass through the corresponding wire outlet holes 401 and are connected to the corresponding cables.

[0025] Due to the adoption of a five-winding structure for the secondary coil 1 of the present utility model, the number of cable arrangements and the number of lead outlets of the secondary coil are increased. And as Figure 2 shown, the present utility model first leads out the same number of leads from both sides of the secondary coil 1, and at the same time, the secondary terminal block 5 is disposed above the primary coil 2 in the radial direction. In this way, it is convenient to connect the leads led out from both sides of the secondary coil 2 to the secondary terminal block 5, and at the same time, the space occupied by the lead outlets can be reduced, thereby ensuring the overall compact structure of the device. And except for the remaining winding 105, the lead-out ends of the other adjacent windings are not on the same side, and it is also easy to distinguish when wiring the leads. Secondly, the present utility model separately designs a connection plate 4 to install the secondary terminal block 5, and arranges the leads of the primary coil 2 with higher potential separately on the connection plate 4, while arranging the secondary coil terminals on the secondary terminal block 5. In this way, the high-potential part can be kept away from the secondary lead-out terminals, which can better reduce the discharge risk between the terminals, that is, it can prevent the influence on the product performance caused by the discharge short circuit between adjacent terminals due to excessive field strength. And as Figure 6 shown, this arrangement can not only ensure the normal application of the secondary terminal block 5 under the breakdown voltage, but also reduce the deformation amount of the connecting spring when the primary coil 2 (HF terminal) is connected to the bottom of the intermediate voltage bushing of the capacitive voltage divider, thereby reducing the tensile stress between the fastener and the connecting piece and improving the service life.

[0026] As Figures 2 to 3As shown, the remaining winding 105, the fourth winding 104, the third winding 103, the second winding 102, and the first winding 101 are arranged from the inside to the outside in sequence. The number of turns of the innermost remaining winding 105 is a little more than that of other windings. Therefore, after the number of turns per layer is evenly divided, it is wound in three layers. The head and tail ends (dn and da) of the remaining winding 105 are respectively led out from both sides of the secondary coil 1. After the number of turns of the remaining several windings are evenly distributed, they are wound in groups of two layers, and the outgoing ends of adjacent windings are not on the same side. In this way, not only can it ensure that the head and tail of a single winding are on the same side for convenient lead-out and connection, but also can maximize the space utilization rate of the single-layer coil. And as Figure 6 shown, through the above winding arrangement of the present utility model, it is also beneficial to the terminal arrangement design on the secondary terminal block 5, and it can make the winding terminals on the same side arranged on the same side.

[0027] As Figure 3 shown, a shielding ring 106 is provided outside the first winding 101. The shielding ring 106 is used to shield the floating potential and uniform the electric field, so as to make the secondary inter-turn potential evenly distributed.

[0028] As Figure 1 shown, in this embodiment, the secondary coil 1 is arranged in the primary coil 2, the primary coil 2 is arranged in an electromagnetic unit seat body 6, and a plurality of support columns 3 are provided on the upper side of the electromagnetic unit seat body 6 to support and fix the connecting plate 4. The support columns 3 need to have sufficient height to ensure the installation space of the primary coil 2 and the outgoing space of each lead. In addition, in this embodiment, two fastening nuts 301 are provided at the upper end of the support column 3 to clamp and fix the connecting plate 4. By screwing the fastening nuts 301, its position on the support column 3 can be changed, and thus the height adjustment of the connecting plate 4 can be realized, so as to further ensure that there is sufficient space above the primary coil 2 to realize the connection of the coil leads.

[0029] As Figures 4 to 5 shown, in this embodiment, the primary coil 2 adopts two series-connected primary coil segments, and the two primary coil segments are wrapped and fixed by a primary coil skeleton 201 (insulating layer). The primary coil 2 is provided with a primary winding lead A 202 and a primary winding lead B 203 respectively passing through the corresponding outgoing holes 401 on the connecting plate 4. The primary coil 2 is a well-known technology in the art. For example, reference can be made to the patent with the publication number CN107610907A. The present utility model adopts the above structure to facilitate the expansion of the inner and outer diameters of the primary coil 2, so as to meet the assembly requirements and ensure the electrical performance at the same time. The present utility model can also adopt a primary coil 2 with other suitable structures according to actual needs.

[0030] The working principle of the present utility model is:

[0031] The secondary coil 1 of the present utility model has a five-winding structure, and the leads of each winding are led out in equal numbers from both sides of the secondary coil 1. Among them, except that the head and tail ends of the remaining winding 105 are led out from both sides of the secondary coil 1 respectively, the lead ends of the remaining adjacent windings are not on the same side. In this way, not only can it ensure that the head and tail of a single winding are on the same side of the secondary coil 1 for convenient lead-out and connection, but also can maximize the space utilization rate of the single-layer coil. In addition, the present utility model is provided with a connecting plate 4 above the secondary coil 1 in the radial direction, and a secondary terminal block 5 is arranged on the connecting plate 4. The leads of the primary coil 2 are led out from the corresponding lead-out holes 401 on the connecting plate 4, and the leads of the secondary coil 1 are respectively connected to the corresponding terminals on the secondary terminal block 5. This structure can make the high-potential part far away from the secondary lead-out terminals, thereby preventing the discharge short circuit between adjacent terminals caused by excessive field strength from affecting the product performance. At the same time, it can also reduce the deformation amount of the connecting spring when the primary coil 2 (HF terminal) is connected to the bottom of the intermediate voltage bushing of the capacitor voltage divider, and improve the service life of the equipment.

Claims

1. A five-winding coil structure of a capacitive voltage transformer, characterized in that: It includes a secondary coil (1), and the secondary coil (1) includes a first winding (101), a second winding (102), a third winding (103), a fourth winding (104) and a remaining winding (105). The leads at both ends of the first winding (101), the leads at both ends of the third winding (103), and the dn lead of the remaining winding (105) are led out from one side of the secondary coil (1). The leads at both ends of the second winding (102), the leads at both ends of the fourth winding (104), and the da lead of the remaining winding (105) are led out from the other side of the secondary coil (1). The secondary coil (1) is arranged in the primary coil (2), and a connecting plate (4) is provided above the primary coil (2) in the radial direction. A secondary terminal block (5) and a wire outlet hole (401) are provided on the connecting plate (4). The leads at both ends of the first winding (101), the leads at both ends of the second winding (102), the leads at both ends of the third winding (103), the leads at both ends of the fourth winding (104), and the leads at both ends of the remaining winding (105) are respectively connected to the corresponding terminals on the secondary terminal block (5). The leads of the primary coil (2) respectively pass through the corresponding wire outlet holes (401).

2. The five-winding coil structure of the capacitive voltage transformer according to claim 1, characterized in that: The remaining winding (105), the fourth winding (104), the third winding (103), the second winding (102) and the first winding (101) are arranged in sequence from the inside to the outside.

3. The five-winding coil structure of the capacitive voltage transformer according to claim 2, wherein: A shielding ring (106) is provided outside the first winding (101).

4. The five-winding coil structure of the capacitive voltage transformer according to claim 1, characterized in that: The primary coil (2) is arranged in an electromagnetic unit seat body (6), and a plurality of support columns (3) are provided on the upper side of the electromagnetic unit seat body (6). The connecting plate (4) is installed on the support columns (3).

5. The five-winding coil structure of the capacitive voltage transformer according to claim 4, characterized in that: Two fastening nuts (301) are provided at the upper ends of the support columns (3), and the connecting plate (4) is clamped and fixed by the two fastening nuts (301).

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