Flame-retardant open-type current transformer

Abstract

The utility model discloses a flame retardant open type current transformer, specifically relates to current transformer field, including current transformer body, current transformer body includes element shell, connector lug, fixed seat and seal cover, element shell is welded on the fixed seat, the bottom end of element shell is provided with connector lug, and the seal cover is provided with the connector lug. The element shell is connected with a sealing cover, a first flame-retardant epoxy resin layer is poured on the inner side, connected with the sealing cover, of the element shell, a second flame-retardant epoxy resin layer is poured on the outer side, the outer side of the element shell is connected with a first flame-retardant shell, and the first flame-retardant shell is connected with a second flame-retardant shell. And a first sealing ring and a second sealing ring are respectively arranged at two joints of the first flame-retardant shell and the second flame-retardant shell. The utility model has the advantages of strong internal and external flame retardant effect, and can improve the heat dissipation efficiency, thereby preventing internal elements from being burnt out, and prolonging the service life.

Description

Technical Field

[0001] The utility model relates to the technical field of current transformers, and more specifically, to a flame-retardant open-type current transformer. Background Technique

[0002] A current transformer works based on the principle of electromagnetic induction and usually consists of a closed ferromagnetic body and windings. Its primary winding has very few turns and is connected in series in the circuit where the current to be measured passes through. Therefore, it often has the full current of the circuit flowing through it. The secondary winding has more turns and is connected in series in the measuring instrument and the protection circuit. When the current transformer is working, its secondary circuit is always closed. Therefore, the impedance of the series-connected coil in the measuring instrument and the protection circuit is very small, and the working state of the current transformer is close to a short circuit.

[0003] Open-type current transformers are applicable to current measurement, signal sampling, and microcomputer protection of electrical equipment in 10KV AC power systems. This type of current transformer has the characteristics of small volume, light weight, being openable, and easy to install, and is divided into indoor type and outdoor type. The indoor type is widely used in compact fully insulated ring main unit switch cabinets and is very suitable for forming a sampling unit with remote terminal equipment to provide data support for the entire system. During installation, it can be directly clamped on the connected incoming and outgoing cable, which is simple and fast. The outdoor type is widely used in overhead lines, reactive power compensation, and other devices.

[0004] However, the existing open-type current transformers have poor flame-retardant effects, so when working in a continuous high-temperature environment, they are prone to being burned out or having their service life shortened. Therefore, a flame-retardant open-type current transformer is proposed. Content of the Utility Model

[0005] In order to overcome the above-mentioned defects of the prior art, the utility model provides a flame-retardant open-type current transformer to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solution: a flame-retardant open-type current transformer, including a current transformer body. The current transformer body includes an element housing, a wiring head, a fixing seat, and a sealing cover. The element housing is welded to the fixing seat. The wiring head is arranged at the bottom end of the element housing. The element housing is connected with the sealing cover. A first flame-retardant epoxy resin layer is cast on the inner side where the element housing and the sealing cover are connected, and a second flame-retardant epoxy resin layer is cast on the outer side. A first flame-retardant housing is connected to the outer side of the element housing, and a second flame-retardant housing is connected to the first flame-retardant housing. First sealing rings and second sealing rings are respectively arranged at the two connection parts of the first flame-retardant housing and the second flame-retardant housing.

[0007] Preferably, the first flame-retardant housing includes a fixing ring, a first side plate, a first inner ring, a first connecting block, a first fin, and a second connecting block. The fixing ring is welded to the bottom end of the component housing. A first side plate is welded to one side of the fixing ring. A first inner ring is welded to one side of the first side plate. A plurality of first connecting blocks and first fins are provided on the fixing ring. A plurality of second connecting blocks are provided on the first inner ring.

[0008] Preferably, the second flame-retardant housing includes a sealing ring, a second side plate, a second inner ring, a third connecting block, a second fin, a fourth connecting block, a water inlet, and a drain port. The sealing ring is connected to the fixing ring through the third connecting block. A second side plate is welded to one side of the sealing ring. A second inner ring is welded to one side of the second side plate. A plurality of fourth connecting blocks are provided on the second inner ring. A plurality of second fins and third connecting blocks are provided on the sealing ring. A water inlet is provided at the bottom of the sealing ring. A drain port is provided on one side of the top of the second side plate.

[0009] Preferably, the first flame-retardant housing and the second flame-retardant housing are connected to form an annular cavity inside, and the top of the component housing and the sealing cover are arranged inside the annular cavity.

[0010] Preferably, a coolant is provided inside the annular cavity.

[0011] The technical effects and advantages of the present utility model:

[0012] Through the settings of the first flame-retardant housing, the second flame-retardant housing, the first sealing ring, and the second sealing ring, compared with the prior art, by wrapping the current transformer in the annular cavity, it is convenient to protect the current transformer, and the coolant can be filled in the annular cavity, which can improve the heat dissipation effect and play a flame-retardant role, thereby improving the service life and flame-retardant effect of the current transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0014] Figure 2 It is a schematic diagram of the connection structure between the first flame-retardant housing and the current transformer body of the present utility model.

[0015] Figure 3 It is a schematic diagram of the structure of the current transformer body of the present utility model.

[0016] Figure 4 It is a schematic diagram of the cooperation structure between the second flame-retardant housing and the two sealing rings of the present utility model.

[0017] Figure 5 It is a schematic diagram of the structure of the second flame-retardant housing of the present utility model.

[0018] The attached drawing reference numerals are as follows: 1, current transformer body; 101, component housing; 102, connection terminal; 103, fixing base; 104, sealing cover; 2, first flame-retardant housing; 201, fixing ring; 202, first side plate; 203, first inner ring; 204, first connection block; 205, first fin; 206, second connection block; 3, second flame-retardant housing; 301, sealing ring; 302, second side plate; 303, second inner ring; 304, third connection block; 305, second fin; 306, fourth connection block; 307, water inlet; 308, drain outlet; 4, first sealing ring; 5, second sealing ring; 6, first flame-retardant epoxy resin layer; 7, second flame-retardant epoxy resin layer. Detailed implementation mode

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] As shown in the attached Figures 1-5 The flame-retardant open-type current transformer shown includes a current transformer body 1. The current transformer body 1 includes a component housing 101, a connection terminal 102, a fixing base 103, and a sealing cover 104. The component housing 101 is welded to the fixing base 103. A connection terminal 102 is provided at the bottom end of the component housing 101. The component housing 101 is connected with a sealing cover 104. A first flame-retardant epoxy resin layer 6 is cast on the inner side where the component housing 101 and the sealing cover 104 are connected, and a second flame-retardant epoxy resin layer 7 is cast on the outer side. A first flame-retardant housing 2 is connected to the outer side of the component housing 101. A second flame-retardant housing 3 is connected to the first flame-retardant housing 2. First sealing ring 4 and second sealing ring 5 are respectively provided at the two connection parts of the first flame-retardant housing 2 and the second flame-retardant housing 3. The connection of the first flame-retardant housing 2 and the second flame-retardant housing 3 forms an annular cavity inside, and the top of the component housing 101 and the sealing cover 104 are arranged in the annular cavity. A coolant is arranged in the annular cavity.

[0021] In specific implementation, through the detachable design of the sealing cover 104, it is convenient to install the winding wire and the iron core in the component housing 101 and seal them with the sealing cover 104. The winding wire can be connected to the terminal 102, facilitating external wiring. When the sealing cover 104 is connected to the component housing 101, a flame-retardant epoxy resin is filled into the internal space, and thus a part is removed at the connection between the sealing cover 104 and the component housing 101 to form a first flame-retardant epoxy resin layer 6 and a second flame-retardant epoxy resin layer 7, achieving sealing and having waterproof performance while improving flame retardancy. Then, by arranging the first sealing ring 4 and the second sealing ring 5 between the first flame-retardant housing 2 and the second flame-retardant housing 3 to connect the first flame-retardant housing 2 and the second flame-retardant housing 3, the first sealing ring 4 and the second sealing ring 5 are squeezed to improve the sealing performance of the connection between the first flame-retardant housing 2 and the second flame-retardant housing 3, forming an annular cavity. Then, by introducing the coolant into the bottom of the annular cavity and discharging it from the top, the heat dissipation effect of the current transformer can be improved, and the flame-retardant effect can be further enhanced. The coolant can be cold water.

[0022] As shown in the Figure 2 appendix Figure 5 The first flame-retardant housing 2 includes a fixing ring 201, a first side plate 202, a first inner ring 203, a first connecting block 204, a first fin 205, and a second connecting block 206. The fixing ring 201 is welded to the bottom end of the component housing 101. One side of the fixing ring 201 is welded with the first side plate 202. One side of the first side plate 202 is welded with the first inner ring 203. A plurality of first connecting blocks 204 and first fins 205 are arranged on the fixing ring 201. A plurality of second connecting blocks 206 are arranged on the first inner ring 203.

[0023] The second flame-retardant housing 3 includes a sealing ring 301, a second side plate 302, a second inner ring 303, a third connecting block 304, a second fin 305, a fourth connecting block 306, a water inlet 307, and a drain outlet 308. The sealing ring 301 is connected to the fixing ring 201 through the third connecting block 304. One side of the sealing ring 301 is welded with the second side plate 302. One side of the second side plate 302 is welded with the second inner ring 303. A plurality of fourth connecting blocks 306 are arranged on the second inner ring 303. A plurality of second fins 305 and third connecting blocks 304 are arranged on the sealing ring 301. The water inlet 307 is arranged at the bottom of the sealing ring 301. The drain outlet 308 is arranged at one side of the top of the second side plate 302.

[0024] During specific implementation, the fixing ring 201 is aligned with the sealing ring 301, so that the first inner ring 203 and the second inner ring 303 are aligned. By appropriately rotating the sealing ring 301, the respective first connecting blocks 204 and third connecting blocks 304, and the second connecting blocks 206 and fourth connecting blocks 306 are aligned respectively, and then they are connected and fixed by screws. The second sealing ring 5 between the fixing ring 201 and the sealing ring 301 and the first sealing ring 4 between the first inner ring 203 and the second inner ring 303 are clamped and fixed, so as to achieve sealing, and an annular space surrounding the top of the current transformer body 1 is formed inside the first flame-retardant housing 2 and the second flame-retardant housing 3, so as to facilitate the injection of coolant, achieving the effect of isolation and cooling, and thus improving the heat dissipation efficiency and the flame-retardant effect.

[0025] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flame-retardant open-type current transformer, comprising a current transformer body (1), characterized in that: The current transformer body (1) comprises an element housing (101), a terminal head (102), a fixing seat (103) and a sealing cover (104); the element housing (101) is welded to the fixing seat (103); a terminal head (102) is arranged at the bottom end of the element housing (101); the element housing (101) is connected to the sealing cover (104); a first flame retardant epoxy resin layer (6) is cast on the inner side of the connection between the element housing (101) and the sealing cover (104); a second flame retardant epoxy resin layer (7) is cast on the outer side; the outer side of the element housing (101) is connected to the first flame retardant housing (2); the first flame retardant housing (2) is connected to the second flame retardant housing (3); and a first sealing ring (4) and a second sealing ring (5) are respectively arranged at two connection points between the first flame retardant housing (2) and the second flame retardant housing (3).

2. The flame-retardant open-type current transformer according to claim 1, characterized in that: The first flame-retardant housing (2) comprises a fixing ring (201), a first side plate (202), a first inner ring (203), a first connecting block (204), a first fin (205) and a second connecting block (206); the fixing ring (201) is welded to the bottom end of the element housing (101); the first side plate (202) is welded to one side of the fixing ring (201); the first inner ring (203) is welded to one side of the first side plate (202); a plurality of first connecting blocks (204) and first fins (205) are arranged on the fixing ring (201); and a plurality of second connecting blocks (206) are arranged on the first inner ring (203).

3. The flame-retardant open-type current transformer according to claim 2, characterized in that: The second flame-retardant housing (3) comprises a sealing ring (301), a second side plate (302), a second inner ring (303), a third connecting block (304), a second fin (305), a fourth connecting block (306), a water inlet (307) and a water outlet (308); the sealing ring (301) is connected to the fixing ring (201) via the third connecting block (304); the second side plate (302) is welded to one side of the sealing ring (301); the second inner ring (303) is welded to one side of the second side plate (302); a plurality of fourth connecting blocks (306) are arranged on the second inner ring (303); a plurality of second fins (305) and a third connecting block (304) are arranged on the sealing ring (301); a water inlet (307) is arranged at the bottom of the sealing ring (301); and a water outlet (308) is arranged at one side of the top of the second side plate (302).

4. The flame-retardant open-type current transformer according to claim 3, characterized in that: The first flame retardant housing (2) and the second flame retardant housing (3) are connected so as to form an annular cavity inside, and the top of the element housing (101) and the sealing cover (104) are arranged in the annular cavity.

5. The flame-retardant open-type current transformer according to claim 4, characterized in that: Cooling liquid is arranged in the annular cavity.

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