CN211455520U

CN211455520U - Integrated pouring type current transformer

Info

Publication number: CN211455520U
Application number: CN201922042254.0U
Authority: CN
Inventors: 吕航; 李向动
Original assignee: Nanjing Fine Electric Co ltd
Current assignee: Nanjing Fine Electric Co ltd
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2020-09-08
Anticipated expiration: 2029-11-25

Abstract

The utility model provides an integrative pouring type current transformer includes the inner tube, connects shell, the CT winding of cover on the inner tube, installs the lead terminal on the shell, the bottom of inner tube outwards extends and forms an annular skirt, the shell is the loop configuration, and the cross section presents the shape of falling L to back-off is on the inner tube, and the two forms one and accepts the chamber, and the CT winding is located accepts the intracavity. The inner cylinder and the shell are separated through the insulating ring, so that the inner cylinder and the shell are prevented from being conducted to generate short-circuit turns, and further, the error is increased. The utility model discloses an inner tube and the insulation design of shell department have avoided forming a short circuit circle between casing and the drum to avoided forming the error that the circulation leads to, and inner tube and shell design are that the device is dismantled easily, the maintenance of being convenient for.

Description

Integrated pouring type current transformer

[ technical field ] A method for producing a semiconductor device

The utility model relates to the technical field of electrical equipment, specifically be an integrative pouring type current transformer.

[ background of the invention ]

The current transformer is an instrument for measuring by converting a large primary side current into a small secondary side current according to the electromagnetic induction principle. The current transformer is composed of a closed iron core and a winding. The number of turns of a primary side winding of the transformer is small, the transformer is connected in a circuit of current to be measured in series, an iron core and a coil are fixed in the transformer in an epoxy resin pouring mode, and the transformer has the advantage of good stability, but the transformer is not convenient to maintain under the common condition, and a short circuit turn is easy to form because of the formation of the short circuit turn, after the short circuit turn is formed, current for excitation can form a circulating current in the short circuit turn, so that the irregular current for excitation is increased, and finally, the displayed error of the current transformer is too large to meet the use requirement.

Therefore, the problem to be solved in the art is to provide an integrally cast current transformer which is convenient to maintain and capable of reducing errors.

[ Utility model ] content

To the above problem, the utility model discloses an inner tube and the insulation design of shell department have avoided forming a short circuit circle between casing and the drum to avoided forming the error that the circulation leads to, and inner tube and shell design are that the device is dismantled easily, the maintenance of being convenient for.

In order to solve the problem, the utility model discloses a casting formula current transformer includes the inner tube, connects shell, the cover on the inner tube and establishes CT winding, install the lead wire end on the shell on the inner tube, the bottom of inner tube outwards extends and forms an annular skirt, the shell is the loop configuration, and the cross section presents the shape of falling L to back-off on the inner tube, the cavity is acceptd to the two formation one, and the CT winding is located accepts the intracavity. The inner cylinder and the shell are separated through the insulating ring, so that the inner cylinder and the shell are prevented from being conducted to generate short-circuit turns, and further, the error is increased.

Furthermore, the shell comprises a side plate and a transverse plate, the side plate surrounds the side plate to form a circular ring, the transverse plate is located at the top of the side plate, the bottom of the side plate is connected to the skirt, and the insulating ring is installed below the transverse plate.

Furthermore, the outer wall of the inner barrel is of a stepped structure, the insulating ring is abutted to the stepped structure of the inner barrel, a circle of U-shaped groove is formed between the outer shell and the outer wall of the inner barrel through the insulating ring, and epoxy resin is filled in the U-shaped groove.

Furthermore, the lead terminals comprise hand holes extending out of the shell, a plurality of terminal rows and a respirator are mounted on the outer wall of each hand hole, and a sealing plate is mounted at the end part of each hand hole.

Furthermore, the lead end comprises a hand hole extending out of the shell, and an accommodating cavity formed by the inner cylinder and the shell is communicated with the hand hole.

Furthermore, the utility model discloses an insulating design of inner tube and shell department has avoided forming a short circuit circle between casing and the drum to avoided forming the error that the circulation leads to, and inner tube and shell design are that the device is dismantled easily, the maintenance of being convenient for.

[ description of the drawings ]

Fig. 1 is the structure schematic diagram of the integrated pouring type current transformer of the utility model.

Fig. 2 is the structure schematic diagram of the inner tube in the integrated pouring type current transformer of the utility model.

Fig. 3 is a partially enlarged view of a portion a in fig. 1.

[ detailed description ] embodiments

The directional terms of the present invention, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", etc., are only directions in the drawings, and are only used for explaining and explaining the present invention, but not for limiting the scope of the present invention.

Referring to fig. 1 and fig. 2, the present invention provides a structure of an integrated pouring type current transformer, which includes an inner tube 1, a shell 2 connected to the inner tube, a CT winding 3 sleeved on the inner tube, and a lead terminal 4 installed on the shell 2. Wherein the inner tube 1 is the cylindric structure, and its bottom outwards extends and forms an annular skirt 101, offers a plurality of screw hole that is used for connecting other equipment on the skirt. The shell 2 is of an annular structure, the cross section of the shell is inverted L-shaped and is reversely buckled on the inner barrel 1, the shell and the inner barrel form an accommodating cavity, the CT winding 3 is located in the accommodating cavity and sleeved on the inner barrel, and epoxy resin is filled between the CT winding 3 and the inner barrel and between each layer of CT winding. The housing 2 comprises a side plate 201 surrounding a circular ring shape and a transverse plate 202 positioned at the top of the side plate, and the bottom of the side plate 201 is connected to the skirt 101 through a fastener 5. A circle of insulating ring 6 with an L-shaped cross section is installed below the transverse plate 202 through a fastener, the insulating ring 6 enables the end portion of the transverse plate to be separated from the inner barrel 1, the outer wall of the inner barrel 1 is of a stepped structure, the insulating ring 6 is abutted to the stepped structure of the inner barrel, a circle of U-shaped groove is formed between the transverse plate 202 and the outer wall of the inner barrel through the insulating ring 6, and epoxy resin 7 is filled in the U-shaped groove. The lead terminal 4 comprises a hand hole 401 extending out of the housing 2, a plurality of terminal strips 402 for connecting the circuit are mounted on the outer wall of the hand hole, a breather 403 is further mounted on the hand hole, and a sealing plate 404 is mounted at the end of the hand hole through a fastener 5. The accommodation cavity formed by the inner tube 1 and the outer shell 2 is communicated with the hand hole 401, and when the CT winding 3 generates heat and air expands, the air is exhausted by the respirator 403. The utility model discloses an inner tube and the insulation design of shell department have avoided forming a short circuit circle between casing and the drum to avoided forming the error that the circulation leads to, and inner tube and shell design are that the device is dismantled easily, the maintenance of being convenient for.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides an integrative pouring type current transformer, its characterized in that, integrative pouring type current transformer includes inner tube (1), connects shell (2), the cover on the inner tube CT winding (3), installs lead terminal (4) on shell (2) of establishing, the bottom of inner tube outwards extends and forms an annular skirt (101), shell (2) are the loop configuration, and the cross section presents the shape of falling L to the back-off is on inner tube (1), and the two forms one and accepts the chamber, and CT winding (3) are located and accept the intracavity, cut off through insulating ring (6) between inner tube (1) and shell (2), prevent that the two from switching on and produce the short circuit circle, and then increase error.

2. A cast one piece current transformer according to claim 1, wherein the outer shell (2) comprises a side plate (201) enclosing a circular ring shape and a cross plate (202) at the top of the side plate, the bottom of the side plate (201) being connected to the skirt (101), and the insulating ring (6) being mounted below the cross plate.

3. A cast-in-one current transformer according to claim 1, characterized in that the outer wall of the inner barrel (1) is stepped, the insulating ring (6) abuts against the stepped structure of the inner barrel, the insulating ring (6) forms a circle of U-shaped groove between the outer shell (2) and the outer wall of the inner barrel, and the U-shaped groove is filled with epoxy resin (7).

4. A cast-in-one current transformer according to claim 1, characterised in that the terminals (4) comprise hand holes (401) extending to the housing (2), the outer walls of the hand holes being fitted with terminal rows (402) and a breather (403), the ends of the hand holes being fitted with a closing plate (404).

5. A cast-in-one current transformer according to claim 1, characterized in that the lead terminals (4) comprise hand holes (401) extending to the outer shell (2), the accommodation cavity formed by the inner barrel (1) and the outer shell (2) communicating with the hand holes (401).