A damper for preventing ferromagnetic resonance of a capacitive voltage transformer and a manufacturing method thereof

Abstract

The present invention relates to a method for manufacturing a damper for preventing ferromagnetic resonance in capacitive voltage transformers, belonging to the technical field of voltage transformer production. The damper comprises an iron core coated with an electrical insulating paper layer and housed in a ceramic housing. The housing is then coated with a high-temperature insulating layer and a high-resistivity conductor layer. The damper designed in the present invention has a compact structure, occupies little space, and has low production costs.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage transformer production, and in particular to a damper suitable for preventing ferromagnetic resonance of a capacitive voltage transformer and a manufacturing method thereof. Background Art

[0002] A capacitive voltage transformer (CVT) uses a voltage divider capacitor to extract voltage, which is then transformed by a transformer to serve as a voltage source for meters, relay protection, and other applications. CVTs can also couple carrier frequencies to transmission lines for long-distance communications. Compared to conventional electromagnetic VTs, CVTs offer advantages in terms of cost and safety, in addition to preventing ferromagnetic resonance caused by saturation of the VT core.

[0003] Currently, there are various methods for preventing ferroresonance in capacitive voltage transformers, with the use of rapidly saturated reactor dampers being a common approach. These dampers consist of two components: a reactor and a resistor. These components must be installed separately, resulting in lengthy assembly times, large space requirements, and high costs. Summary of the Invention

[0004] In order to solve the problems in the prior art, the patent of this invention designs a damper suitable for preventing ferromagnetic resonance of capacitive voltage transformer, which reduces the product volume and saves occupied space.

[0005] The technical solution adopted by the present invention is: the damper includes an iron core, the outer surface of the iron core is covered with an electrical insulating paper layer and is arranged in a ceramic protective box, and the ceramic protective box is sequentially provided with a high-temperature resistant insulation layer and a high-resistivity wire layer.

[0006] Furthermore, the outer side of the ceramic protective box is alternately provided with three layers of high-temperature resistant insulation layers and two layers of high-resistivity wire layers from the inside to the outside. The three layers of high-temperature resistant insulation layers are, from the inside to the outside, an inner high-temperature resistant insulation layer, a medium high-temperature resistant insulation layer and an outer high-resistivity insulation layer. The two layers of high-resistivity wire layers are, from the inside to the outside, an inner high-resistivity wire layer and an outer high-resistivity wire layer.

[0007] Furthermore, the lead wires of the outer resistivity conductor layer are covered with lead sheaths, and the ends of the lead wires are crimped with connection terminals.

[0008] Furthermore, the two high-resistivity conductor layers are both wound using high-resistivity constantan wire or manganin wire.

[0009] Furthermore, the three high-temperature resistant insulation layers are all wrapped with high-temperature resistant insulation tapes.

[0010] The specific steps of the manufacturing method of the damper for preventing ferromagnetic resonance of a capacitive voltage transformer disclosed in the present invention are as follows: (1) wrapping electrical insulation paper on a ring-shaped iron core to form an electrical insulation paper layer, then placing the iron core in a ceramic protective box, and then wrapping a high-temperature resistant insulation tape on the outside of the ceramic protective box to form an inner high-temperature resistant insulation layer;

[0011] (2) Wrapping a high-resistivity wire around the outer surface of the inner high-resistivity insulation layer to form an inner high-resistivity wire layer, then wrapping a high-temperature resistant insulation tape between the inner high-resistivity wire layers to form a middle high-temperature resistant insulation layer, then wrapping a high-resistivity wire around the outer high-resistivity wire layer, and then wrapping a high-temperature resistant insulation tape to form an outer high-temperature resistant insulation layer;

[0012] (3) Cover the lead wire of the outer high resistivity conductor layer with a lead sheath, and crimp the terminal at the end of the lead wire for external wiring.

[0013] Furthermore, the method for preparing the outer high-temperature resistant insulating layer in step (2) is to wrap a layer of high-temperature resistant insulating tape on the outer high-resistivity conductor layer in a semi-overlapping manner.

[0014] Compared to existing technologies, the patented damper designed in this invention for preventing ferromagnetic resonance in capacitive voltage transformers offers significant advancements: By using high-resistivity constantan or manganese copper wire wound around a ceramic housing containing an iron core, the invention creates a unique damper structure that integrates the resistor and reactor into a single component. This reduces product size, saves space, and lowers production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the front view of the structure of a damper for preventing ferromagnetic resonance of a capacitive voltage transformer.

[0016] Figure 2 This is a schematic diagram of the cross-sectional structure of a damper for preventing ferromagnetic resonance of a capacitive voltage transformer.

[0017] In the figure, 1 is an iron core, 2 is an electrical insulation paper layer, 3 is a ceramic protective box, 4 is an inner high-temperature resistant insulation layer, 5 is an inner high-resistance wire layer, 6 is a medium high-temperature resistant insulation layer, 7 is an outer high-resistance wire layer, 8 is an outer high-temperature resistant insulation layer, 9 is a lead sheath, 10 is a terminal block, and 71 is a lead wire. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The technical solutions in the embodiments of the present invention are clearly and completely described. The embodiments described are only embodiments of a part of the present invention, not all of it. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] like Figure 1 、 2 As shown, the patent of the present invention designs an embodiment of a damper suitable for preventing ferromagnetic resonance of a capacitive voltage transformer. In this embodiment, the damper for preventing ferromagnetic resonance of a capacitive voltage transformer includes an iron core 1, the outer surface of the iron core 1 is covered with an electrical insulating paper layer 2, and is arranged in a ceramic protective box 3.

[0020] The outer side of the ceramic protective box 3 is alternately provided with three layers of high-temperature resistant insulation layers and two layers of high-resistivity wire layers from the inside. The three layers of high-temperature resistant insulation layers are, from the inside to the outside, an inner high-temperature resistant insulation layer 4, a medium high-temperature resistant insulation layer 6 and an outer high-temperature resistant insulation layer 8. The two layers of high-resistivity wire layers are, from the inside to the outside, an inner high-resistivity wire layer 5 and an outer high-resistivity wire layer 7.

[0021] In this embodiment, the two high-resistivity conductor layers can be wound using high-resistivity constantan wire or manganese copper wire. The lead wires 71 of the outer resistivity conductor layer 7 are covered with a lead sheath 9, and the ends of the lead wires 71 are crimped with terminal blocks 10 for external wiring. All three high-temperature resistant insulation layers are wrapped with high-temperature resistant insulation tape.

[0022] The specific steps of the manufacturing method of the damper for preventing ferromagnetic resonance of a capacitive voltage transformer disclosed in this embodiment are as follows: (1) wrapping an annular iron core 1 with electrical insulation paper to form an electrical insulation paper layer 2, then placing the iron core 1 in a ceramic protective box 3, and then wrapping a high-temperature resistant insulation tape on the outside of the ceramic protective box 3 to form an inner high-temperature resistant insulation layer 4;

[0023] (2) A high-resistivity constantan wire is wound around the outside of the inner high-resistivity insulating layer 4 to form an inner high-resistivity conductor layer 5, and then a high-resistivity insulating tape is wrapped around the inner high-resistivity conductor layer 5 to form a middle high-resistivity insulating layer 6, and then a high-resistivity constantan wire is wound around the outside to form an outer high-resistivity conductor layer 7, and then a semi-laminated high-resistivity insulating tape is wrapped around the outside to form an outer high-resistivity insulating layer 8;

[0024] (3) The two lead wires 71 of the outer high resistivity conductor layer 7 are covered with lead sheaths 9, and the ends of the two lead wires 71 are crimped with connection terminals 10 for external wiring.

[0025] The above contents are merely preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. That is, any simple equivalent changes and modifications made in accordance with the claims and description of the present invention are still within the scope of the present invention.

Claims

1. A method for manufacturing a damper for preventing ferromagnetic resonance of a capacitive voltage transformer, characterized in that: The damper includes an iron core, the outer surface of which is covered with an electrical insulating paper layer and is arranged in a ceramic protective box, and a high-temperature resistant insulation layer and a high-resistivity wire layer are sequentially arranged on the outside of the ceramic protective box; three layers of high-temperature resistant insulation layers and two layers of high-resistivity wire layers are alternately arranged on the outside of the ceramic protective box from the inside to the outside, the three layers of high-temperature resistant insulation layers are sequentially an inner high-temperature resistant insulation layer, a medium high-temperature resistant insulation layer and an outer high-resistivity insulation layer from the inside to the outside, and the two layers of high-resistivity wire layers are sequentially an inner high-resistivity wire layer and an outer high-resistivity wire layer from the inside to the outside; the lead wire of the outer high-resistivity wire layer is covered with a lead sheath, and the end of the lead wire is crimped with a terminal; the two layers of high-resistivity wire layers are both wound with high-resistivity constantan wire or manganese copper wire; and the three layers of high-temperature resistant insulation layers are all wrapped with high-resistivity insulation tape; The specific steps of the manufacturing method are: (1) wrapping electrical insulation paper on the annular iron core to form an electrical insulation paper layer, then placing the iron core in a ceramic protective box, and then wrapping a high-temperature resistant insulation tape on the outside of the ceramic protective box to form an inner high-temperature resistant insulation layer; (2) Wrapping a high-resistivity wire around the outer surface of the inner high-resistivity insulation layer to form an inner high-resistivity wire layer, then wrapping a high-temperature resistant insulation tape around the outer surface of the inner high-resistivity wire layer to form a middle high-temperature resistant insulation layer, then wrapping a high-resistivity wire around the outer surface to form an outer high-resistivity wire layer, and then wrapping a high-temperature resistant insulation tape around the outer surface to form an outer high-temperature resistant insulation layer; (3) a lead sheath for the lead wire of the outer high resistivity conductor layer, and a terminal block is crimped at the end of the lead wire for external wiring; The method for preparing the outer high-temperature resistant insulating layer in step (2) is to wrap a layer of high-temperature resistant insulating tape on the outer high-resistivity conductor layer in a semi-overlapping manner.

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