CN220253031U

CN220253031U - Current transformer

Info

Publication number: CN220253031U
Application number: CN202321696137.6U
Authority: CN
Inventors: 宁军; 李志生; 滕本良; 于洪义
Original assignee: Dalian No2 Instrument Transformer Group Co ltd
Current assignee: Dalian No2 Instrument Transformer Group Co ltd
Priority date: 2023-06-30
Filing date: 2023-06-30
Publication date: 2023-12-26
Anticipated expiration: 2033-06-30

Abstract

The utility model discloses a current transformer, which relates to the technical field of power equipment and comprises a porcelain sleeve, wherein a primary conducting rod is arranged in an opening of the porcelain sleeve in a penetrating manner, a connecting piece is fixedly sleeved on the part of the primary conducting rod, which is positioned in the porcelain sleeve, and the bottom of the connecting piece is provided with a flexible connection. The current transformer provided by the utility model reduces the contact resistance of a product part, reduces the temperature rise of the product, improves the performance of the current transformer and ensures the safe operation of a power grid.

Description

Current transformer

Technical Field

The utility model relates to the technical field of power equipment, in particular to a current transformer.

Background

LB7-220 oil immersed vertical current transformer is currently an important use device for national power grid projects, and the device has the characteristics of high insulation strength, stable operation, wider selectable current ratio range, attractive appearance, durability and the like, and is popular in the market. In the existing oil immersed upright current transformer, a part of a primary conducting rod stretches into a porcelain sleeve to be processed into a threaded structure, one end of a flexible connection is welded with a square plate with a round hole in the center, the size of the round hole is slightly larger than the outer diameter of a thread part of the primary conducting rod, when the primary conducting rod is installed with the flexible connection, a nut is screwed in the thread part of the primary conducting rod, then the square plate is sleeved on the primary conducting rod, the square plate is screwed tightly by using the nut, the limit of the square plate is realized by adopting two nuts, and the nut-square plate-nut is tightly attached.

Disclosure of Invention

The utility model aims to provide a current transformer so as to solve the problems in the prior art, reduce the contact resistance of a product part, reduce the temperature rise of the product, improve the performance of the current transformer and ensure the safe operation of a power grid.

In order to achieve the above object, the present utility model provides the following solutions:

the utility model provides a current transformer which comprises a porcelain sleeve, wherein a primary conducting rod is arranged in an opening of the porcelain sleeve in a penetrating mode, a connecting piece is fixedly sleeved on the portion, located in the porcelain sleeve, of the primary conducting rod, and soft connection is arranged at the bottom of the connecting piece.

Optionally, the connecting piece comprises two semicircular hoops which are symmetrically arranged, the two semicircular hoops are fixedly connected, and the part of the primary conducting rod positioned in the porcelain sleeve is fixedly penetrated in a through hole formed after the two semicircular hoops are connected; the soft connection is fixedly connected with the bottom of the semicircular anchor ear.

Optionally, the uniform body shaping in semicircle staple bolt top and bottom has the flange board, two the flange board of semicircle staple bolt passes through fastener fixed connection, in order to make two semicircle staple bolts can hug tightly the conducting rod once, avoids its rotation, consequently after the fixed butt joint of two semicircle staple bolts, the biggest between its inboard two relative semicircle recess inner walls is not greater than the diameter size of once conducting rod to after the inboard semicircle recess joint of two semicircle staple bolts on once conducting rod, through twisting the fastener, make two semicircle staple bolts remove in opposite directions, can realize the fixed to once conducting rod.

Optionally, the fastener is a bolt penetrating through two opposite flange plates, and a nut is fixedly connected to the tail end of the bolt through threads.

Optionally, the soft connection is equally divided into two equal parts, and the equally divided soft connection is welded with the bottoms of the two semicircular anchor ears.

Optionally, the part of the primary conducting rod penetrating the porcelain sleeve is of a smooth round rod structure.

Compared with the prior art, the utility model has the following technical effects:

according to the utility model, the original soft connection is halved, a symmetrical semicircular anchor ear is welded at each soft connection end part, and the symmetrical semicircular anchor ear is connected with the primary conductive rod in a clamping manner of the semicircular anchor ear, so that the connection manner of the primary conductive rod and the soft connection of the original product of the same type is changed, and the contact resistance is reduced. The utility model greatly reduces the contact resistance of the product part, reduces the temperature rise of the product, improves the performance of the current transformer and ensures the safe operation of the power grid.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a partial cross-sectional structure of a current transformer according to the present utility model;

reference numerals illustrate: 1-porcelain sleeve, 2-primary conducting rod, 3-flexible connection, 4-fastener and 5-semicircular anchor ear.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.

The utility model provides a current transformer, which changes the connection mode between soft connection and a primary conducting rod in the prior art, and particularly as shown in figure 1, the current transformer comprises a porcelain bushing 1, wherein a primary conducting rod 2 is penetrated in a side wall opening of the porcelain bushing 1, the part of the primary conducting rod 2 penetrated in the porcelain bushing 1 is of a smooth round rod-shaped structure, two semicircular anchor clamps 5 which are symmetrically arranged are fixedly sleeved on the part of the primary conducting rod 2 positioned in the porcelain bushing 1, the two semicircular anchor clamps 5 are fixedly connected, and the part of the primary conducting rod 2 positioned in the porcelain bushing 1 is fixedly penetrated in a through hole formed after the two semicircular anchor clamps 5 are connected; the flexible connection 3 is equally divided into two parts, and the equally divided flexible connection 3 is welded with the bottoms of the two semicircular anchor ears 5, so that the contact resistance of the joint between the primary conducting rod 2 and the flexible connection 3 can be greatly reduced, the heat locally generated by a product is reduced, and the temperature rise of the product is reduced.

Further preferably, in order to make the connection between the two semicircular hoops 5 more secure and convenient, the flange plates are formed uniformly at the top and the bottom of the semicircular hoops 5 in a unique manner, the flange plates of the two semicircular hoops 5 are fixedly connected through the fastener 4, the fastener 4 is a bolt penetrating through the two opposite flange plates, the tail end of the bolt is fixedly connected with a nut in a threaded manner, other connecting pieces can be adopted, for example, a screw or screw structure can be adopted, and the dismounting and the mounting are convenient; in order to enable the two semicircular hoops 5 to tightly hold the primary conductive rod 2 and avoid rotation of the primary conductive rod 2, after the two semicircular hoops 5 are fixedly abutted, the maximum distance between the inner walls of the two opposite semicircular grooves of the inner sides of the two semicircular hoops is not larger than the diameter of the primary conductive rod 2, so that after the semicircular grooves of the inner sides of the two semicircular hoops 5 are sleeved on the primary conductive rod 2, the two semicircular hoops move in opposite directions by screwing fasteners, and extrusion fixation of the primary conductive rod 2 can be achieved.

The utility model greatly reduces the contact resistance of the product part, reduces the temperature rise of the product, improves the performance of the current transformer and ensures the safe operation of the power grid.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The principles and embodiments of the present utility model have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present utility model; also, it is within the scope of the present utility model to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the utility model.

Claims

1. A current transformer, characterized in that: the novel ceramic sleeve comprises a ceramic sleeve, a primary conducting rod is arranged in an opening of the ceramic sleeve in a penetrating mode, a connecting piece is arranged on a part of the primary conducting rod, which is located in the ceramic sleeve, in a fixed mode, and soft connection is arranged at the bottom of the connecting piece.

2. The current transformer of claim 1, wherein: the connecting piece comprises two semicircular hoops which are symmetrically arranged, the two semicircular hoops are fixedly connected, and the part of the primary conducting rod positioned in the porcelain bushing is fixedly arranged in a through hole formed after the two semicircular hoops are connected in a penetrating manner; the soft connection is fixedly connected with the bottom of the semicircular anchor ear.

3. The current transformer of claim 2, wherein: the flange plates are uniformly formed at the top and the bottom of the semicircular anchor ear, and the flange plates of the two semicircular anchor ears are fixedly connected through fasteners.

4. A current transformer according to claim 3, wherein: the fastener is a bolt penetrating through the two opposite flange plates, and the tail end of the bolt is fixedly connected with a nut in a threaded manner.

5. The current transformer of claim 2, wherein: the soft connection is equally divided into two parts, and the equally divided soft connection is welded with the bottoms of the two semicircular anchor ears.

6. The current transformer of claim 1, wherein: the part of the primary conducting rod penetrating into the porcelain bushing is of a smooth round bar-shaped structure.