CN204215891U - A kind of open current transformer - Google Patents

Abstract

The utility model discloses an open current transformer, which comprises an upper half, an upper iron core, a lower half, a lower iron core and a secondary side coil. One end of the upper half and the lower half are hinged to each other, and the other ends are mutually They are combined to form a ring-shaped shell, and a round hole for fixing the power transmission line is provided on the contact surface of the upper half and the lower half. The contact surface of the upper half is provided with a groove, and the contact surface of the lower half is provided with Electric telescopic push rod, the electric telescopic push rod corresponds to the groove, the upper iron core is located in the upper half, the secondary side coil is wrapped around the lower end iron core, the lower end iron core is located in the lower half, the upper end iron core is in contact with the lower end iron core , forming a ring core. The open current transformer of the utility model has a novel structural design, can conveniently and accurately close and separate the two parts of the transformer, quickly take out the cables, and quickly dissipate the heat generated in the transformer to the surrounding environment, prolonging the use life.

Description

An open current transformer

technical field

The utility model relates to the technical field of high-voltage electrical equipment, and relates to a current transformer, in particular to an open current transformer.

Background technique

The existing low-voltage current transformers are all one-piece structures, with a through hole in the middle for passing through the tested cable. During installation, it is usually necessary to cut off the cable and then put the transformer on the corresponding cable, or let the transformer run If the line is powered off, remove one end of the cable and insert it into the through hole of the transformer. These two methods are inconvenient to install and cannot be operated with power on, and also affect the stability of the electrical system performance. In addition, the current transformer in the power supply circuit is made of silicon steel sheet and enameled wire winding, and the appearance of the current transformer is cast with insulating material. During the installation process, the power supply circuit to be installed must be cut off and corresponding safety measures must be taken before the construction and installation can be carried out. For some places with high power supply requirements, such as chemical dangerous places, hospitals, etc., it will be more troublesome to construct, and many It is because the current transformer is damaged or the selected current transformer does not meet the actual requirements. After using it for a period of time, it is found to be abnormal and it is difficult to replace it. This will cause some errors in the electricity consumption metering and electricity consumption indication. . Cause judgment errors to operation and maintenance personnel.

The existing open current transformer winding method is: the secondary winding is concentrated on the closed iron core, and then cut after pouring epoxy resin, and the two main parts of the cut open current transformer are held by plastic belts. It is detected by the induced current generated by electromagnetic induction on the secondary winding. Its disadvantages are: when the open current transformer is opened and installed with a plastic belt, since the transformer is divided into two main parts, it is difficult to assemble, use, and maintain. Both are inconvenient, and the two parts of the transformer are not aligned when they are closed, and a large force is required when they are separated, which is extremely inconvenient.

Contents of the invention

The utility model provides an open current transformer aiming at the deficiencies of the prior art. This open current transformer has a novel structural design, can conveniently and accurately close and separate the two parts of the transformer, quickly take out the cables, and can quickly Dissipate the heat generated in the transformer to the surrounding environment to prolong the service life.

In order to solve the above technical problems, the utility model is solved by the following technical solutions: an open current transformer, including the upper half, the upper end iron core, the lower half, the lower end iron core and the secondary side coil, the upper One end of the half part and the lower half part are hinged to each other, and the other ends are matched with each other to form a ring-shaped shell. The contact surface of the upper part is provided with a groove, and the contact surface of the lower part is provided with an electric telescopic push rod along the longitudinal direction, and the electric telescopic push rod corresponds to the groove, and the upper iron core is located on the upper In the half part, the secondary side coil is wound on the lower end iron core, the secondary side coil has two terminals for external connection, the lower end iron core is located in the lower half part, and the upper end The iron core is in contact with the lower end iron core to form an annular iron core. The electric telescopic push rod includes a ball screw, a reduction gear and a telescopic push rod. The electric telescopic push rod provides electric energy through an external power supply.

In the above technical solution, preferably, the outer wall of the lower half is provided with several annular cooling fins distributed at intervals from top to bottom, and the annular cooling fins are evenly distributed with inclined outward cooling holes. . Beneficial effects: by designing a reasonable heat dissipation structure on the casing, it can ensure that the heat generated during normal use and power failure can be dissipated to the surrounding environment in time.

In the above technical solution, preferably, several layers of insulating sheds are arranged on the bottom of the lower half. Beneficial effect: the several layers of insulator sheds arranged in this way can ensure sufficient creepage distance.

Compared with the prior art, the utility model has the following beneficial effects: the structure design of the open current transformer of the utility model is novel, and the two parts of the transformer can be conveniently and accurately closed and separated, and the cables can be taken out quickly, and the The reasonable design of the heat dissipation structure on the shell can ensure that the heat generated during normal use and power failure can be dissipated to the surrounding environment in time, and can ensure sufficient creepage distance and prolong the service life.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the utility model.

Detailed ways

The utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Referring to Figure 1, an open current transformer includes an upper half 1, an upper iron core 3, a lower half 2, a lower iron core 4 and two The secondary side coil 5, one end of the upper half 1 and the lower half 2 are hinged to each other, and the other ends are joined together to form an annular shell, and the contact surface of the upper half 1 and the lower half 2 A round hole for fixing the transmission line is provided, a groove 6 is arranged on the contact surface of the upper half part 1, and an electric telescopic push rod 7 is arranged longitudinally on the contact surface of the lower half part 2, and the electric telescopic push rod 7 is arranged longitudinally. The rod 7 corresponds to the groove 6, the upper iron core 3 is located in the upper half 1, the secondary side coil 5 surrounds the lower end iron core 4, and the secondary side coil 5 has two a terminal for external connection, the lower iron core 4 is located in the lower half part 2, the upper iron core 3 is in contact with the lower iron core 4 to form an annular iron core, and the electric telescopic push rod 7 includes ball screw, reduction gear and telescopic push rod, and the electric telescopic push rod 7 provides electric energy through an external power supply.

The outer wall of the lower half part 2 is provided with a plurality of annular cooling fins 8 distributed at intervals from top to bottom, and the annular cooling fins 8 are evenly distributed with cooling holes 9 inclined outward.

Several layers of insulating sheds 10 are arranged on the bottom of the lower half part 2 .

When the user needs to open the current transformer, the user energizes the electric telescopic push rod 7 through an external power supply, and the electric telescopic push rod 7 pushes the upper half 1 to separate from the lower half 2 through the telescopic push rod. When the distance between the lower half parts 2 reaches the maximum distance of the electric telescopic push rod 7, the user can turn the upper half part 1 along the hinge to quickly take out the cables.

Compared with the prior art, the utility model has the following beneficial effects: the structure design of the open current transformer of the utility model is novel, and the two parts of the transformer can be conveniently and accurately closed and separated, and the cables can be taken out quickly, and the The reasonable design of the heat dissipation structure on the shell can ensure that the heat generated during normal use and power failure can be dissipated to the surrounding environment in time, and can ensure sufficient creepage distance and prolong the service life.

Claims (3)

1. An open current transformer, comprising an upper half (1), an upper iron core (3), a lower half (2), a lower iron core (4) and a secondary side coil (5), characterized in that : One end of the upper half (1) and the lower half (2) are hinged to each other, and the other end is joined to each other to form an annular shell, the upper half (1) and the lower half (2) ) on the contact surface is provided with a round hole for fixing the transmission line, on the contact surface of the upper part (1) is provided with a groove (6) along the longitudinal direction, and on the contact surface of the lower part (2) is provided with a motor Telescopic push rod (7), the electric telescopic push rod (7) corresponds to the groove (6), the upper end iron core (3) is located in the upper half (1), the secondary side coil (5) Surrounding the lower iron core (4), the secondary coil (5) has two terminals for external connection, the lower iron core (4) is located in the lower half (2) Inside, the upper iron core (3) is in contact with the lower iron core (4) to form an annular iron core, and the electric telescopic push rod (7) includes a ball screw, a reduction gear and a telescopic push rod. The telescopic push rod (7) provides electric energy through an external power supply. 2. An open current transformer according to claim 1, characterized in that: the outer wall of the lower half (2) is provided with several annular cooling fins (8) distributed at intervals from top to bottom, so On the annular heat sink (8), there are uniformly distributed heat dissipation holes (9) inclined outward. 3. An open current transformer according to claim 2, characterized in that: several layers of insulating sheds (10) are arranged on the bottom of the lower half (2).