CN219497519U - Current transformer for zero line - Google Patents

Abstract

The utility model relates to the technical field of current transformers, in particular to a current transformer for a zero line, which comprises a plastic shell, a magnetic core, a coil and a primary copper piece, wherein the coil is wound on the magnetic core, a hollow cylinder is arranged in the center of the plastic shell, the primary copper piece is inserted into the hollow cylinder, the coil is sleeved on the hollow cylinder in the plastic shell, one end of the plastic shell is provided with a fixed block, two secondary guide pins are arranged in the fixed block, the secondary guide pins are connected with the coil, a phosphor copper needle is further arranged on the fixed block, and the phosphor copper needle extends to the primary copper piece on one side of the phosphor copper needle. The utility model adopts the connection of the secondary guide pin and the coil to realize hard output connection, and the hollow cylinder is arranged between the primary copper piece and the coil for isolation, thereby improving the insulation and pressure resistance between the primary copper piece and the coil. The positioning bulge on the phosphor copper needle is designed, so that the positioning bulge can promote the assembly firmness of the fixed block during the assembly of the transformer, and the use process of the transformer is more stable and reliable.

Description

Current transformer for zero line

Technical Field

The utility model relates to the technical field of current transformers, in particular to a current transformer for a zero line.

Background

The current transformer is a key component in the ammeter and is mainly used for measuring the actual current flowing through the ammeter and completing the collection and calculation of electric energy together with a voltage collection device in the ammeter.

In the prior art, most of primary copper parts of the current transformer directly penetrate through the center of a coil, filling and sealing are carried out between the primary copper parts and the coil through epoxy resin, but in the long-time use process, the epoxy resin and the primary copper parts can crack, so that the voltage resistance and the insulation performance between the primary copper parts and the coil are poor. And the secondary leads are flexible wires, so that the installation of the current transformer is troublesome, and the installation space in the ammeter is relatively large.

Disclosure of Invention

The utility model aims to solve the technical defects and provide the current transformer for the zero line, which is realized in such a way that the input and the output of the transformer are hard-connected, the use and assembly efficiency of the transformer can be improved, and the transformer can collect voltage signals.

The utility model discloses a current transformer for a zero line, which comprises a plastic shell, a magnetic core, a coil and a primary copper piece, wherein the coil is wound on the magnetic core, a hollow cylinder is arranged in the center of the plastic shell and penetrates through the plastic shell, the primary copper piece is inserted into the hollow cylinder, the coil is sleeved on the hollow cylinder in the plastic shell, one end of the plastic shell is provided with a fixed block, two secondary guide pins are arranged in the fixed block, the secondary guide pins are connected with the coil, a phosphor copper needle is further arranged on the fixed block, the phosphor copper needle extends to the primary copper piece on one side of the phosphor copper needle, the phosphor copper needle is connected with the primary copper piece, and the inside of the plastic shell is encapsulated by epoxy resin.

The utility model discloses a phosphorus copper needle, including fixed block, locating hole, locating boss is provided with the vertical passageway that supplies phosphorus copper needle to pass in the fixed block, the size of vertical passageway is greater than the size of phosphorus copper needle, is provided with a locating hole on the fixed block lateral wall of passageway department that corresponds, is provided with the locating boss from the locating hole extension to the fixed block outside on phosphorus copper needle in locating hole department.

One of the two ends of the primary copper piece is provided with a soldering flux strip.

According to the current transformer for the zero line, which is obtained by the utility model, the secondary lead pin is connected with the coil to realize hard output connection, and the primary copper piece is isolated from the coil by the hollow cylinder, so that the insulation and voltage resistance between the primary copper piece and the coil are improved. In addition, the positioning bulge on the phosphor copper needle is designed, so that the positioning bulge can improve the assembly firmness of the fixed block during the assembly of the transformer, and the use process of the transformer is more stable and reliable.

Drawings

FIG. 1 is a front elevational view of the structure of the present utility model;

FIG. 2 is a side view of the structure of the present utility model;

FIG. 3 is an isometric view of the utility model shown in FIG. 1;

fig. 4 is an isometric view of the utility model, schematically indicated at 2.

Detailed Description

In order to further describe the technical means and effects adopted by the present utility model for achieving the intended purpose, the following detailed description will refer to the specific implementation, structure, characteristics and effects according to the present utility model with reference to the accompanying drawings and preferred embodiments.

Example 1:

as shown in fig. 1, fig. 2, fig. 3 and fig. 4, the utility model discloses a current transformer for a zero line, which comprises a plastic shell 1, a magnetic core, a coil and a primary copper piece 4, wherein the coil is wound on the magnetic core, a hollow cylinder 3 is arranged at the center of the plastic shell 1, the hollow cylinder 3 penetrates through the plastic shell 1, the primary copper piece 4 is inserted into the hollow cylinder 3, the coil is sheathed on the hollow cylinder 3 in the plastic shell 1, one end of the plastic shell 1 is provided with a fixed block 5, two secondary guide pins 7 are arranged in the fixed block 5, the secondary guide pins 7 are connected with the coil, a phosphor copper needle 6 is further arranged on the fixed block 5, the phosphor copper needle 6 extends to the primary copper piece 4 at one side, the phosphor copper needle 6 is connected with the primary copper piece 4, and the inside of the plastic shell 1 is encapsulated by epoxy resin.

The utility model discloses a phosphorus copper needle, including fixed block 5, positioning hole, positioning protrusion 10, fixed block 5 is provided with a vertical passageway that supplies phosphorus copper needle 6 to pass in the fixed block 5, the size of vertical passageway is greater than the size of phosphorus copper needle 6, is provided with a locating hole 9 on the fixed block 5 lateral wall of passageway department that corresponds, is provided with the location protrusion 10 on phosphorus copper needle 6 of locating hole 9 department, the location protrusion 10 extends to the fixed block 5 outside from locating hole 9.

One of the two ends of the primary copper piece 4 is provided with a soldering flux 8.

The plastic shell 1 is provided with the hollow column body 3, a channel is formed in the plastic shell, the primary copper piece 4 can be directly inserted into the channel, namely, the hollow column body 3, and in the assembly process of the transformer, a small amount of movable space is reserved between the primary copper piece 4 and the hollow column body 3, so that the position of the primary copper piece 4 can be adjusted slightly during installation. The hollow cylinder 3 is also made of plastic, is integrally formed with the plastic shell 1, and is used for insulating and isolating the coil from the primary copper piece 4, so that the insulating property and the pressure resistance are improved.

A phosphor copper needle 6 is riveted on the primary copper part 4, and the phosphor copper needle 6 is used for collecting voltage signals. The secondary guide needle 7 and the phosphor copper needle 6 are fixed and positioned by the fixing block 5, so that the fixing firmness of the phosphor copper needle 6 and the secondary guide needle 7 can be improved, and the secondary guide needle 7 and the phosphor copper needle 6 are positioned more accurately, thereby facilitating the subsequent installation.

The size of the vertical channel arranged in the fixed block 5 is larger than that of the phosphor copper needle 6 in the vertical channel, but the fixed blocks 5 at the two ends of the vertical channel are tightly matched with the phosphor copper needle 6. The fixation of the phosphor copper needle 6 to the fixing block 5 is firm. The phosphor copper needle 6 in the vertical channel has a certain deformation space under the action of external force. In the natural state, the end part of the positioning bulge 10 on the phosphor copper needle 6 is positioned outside the positioning hole 9, and when the fixed block 5 is matched with the inserted shell, an inner groove can be formed in the inserted shell corresponding to the positioning bulge 10, and the positioning bulge 10 is clamped in the inner groove, so that the connection firmness between the fixed block 5 and the inserted shell is realized, and the stability in the subsequent use process is improved. Naturally, under the action of external force in the inserting process, the positioning protrusion 10 drives the phosphor copper needle 6 in the vertical channel to deform, so that the fixing block 5 can be smoothly inserted into the corresponding inserting shell.

And bury the welding-assisting strip 8 at the both ends of primary copper piece 4 for the mutual-inductor is when using the installation, can directly carry out the heating welding between primary copper piece 4 and its adapting unit, need not to add additional welding-assisting strip 8 again, so the connection welding process is simpler and more convenient, also convenient operation.

The performance of the transformer obtained in this embodiment is as follows:

1. primary and secondary windings: 4.0KV AC, 50Hz,0.5mA,60s (no breakdown, arcing).

2. The insulation resistance between the primary winding and the secondary winding is more than 1GΩ/500Vdc.

3. The mutual inductor is within the range of 50 mA-72A, and the error linearity is less than or equal to +/-0.2%.

4. When half-wave rectification current is input to the primary stages 5A-72A, the error change amount is less than or equal to +/-3 percent.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify 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 application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be in interaction relationship with two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The present utility model is not limited to the preferred embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present utility model.

Claims (3)

1. The utility model provides a current transformer for zero line, includes plastic casing, magnetic core, coil and primary copper spare, the coil is around establishing on the magnetic core, characterized by: the plastic shell is characterized in that a hollow cylinder is arranged at the center of the plastic shell and penetrates through the plastic shell, the primary copper piece is inserted into the hollow cylinder, the coil is sleeved on the hollow cylinder in the plastic shell, a fixed block is arranged at one end of the plastic shell, two secondary guide pins are arranged in the fixed block and connected with the coil, a phosphorus copper needle is further arranged on the fixed block and extends to the primary copper piece at one side of the phosphorus copper needle, the phosphorus copper needle is connected with the primary copper piece, and epoxy resin is used for filling and sealing the inside of the plastic shell.

2. A zero line current transformer according to claim 1, characterized in that: the utility model discloses a phosphorus copper needle, including fixed block, locating hole, locating boss is provided with the vertical passageway that supplies phosphorus copper needle to pass in the fixed block, the size of vertical passageway is greater than the size of phosphorus copper needle, is provided with a locating hole on the fixed block lateral wall of passageway department that corresponds, is provided with the locating boss from the locating hole extension to the fixed block outside on phosphorus copper needle in locating hole department.

3. A current transformer for zero line according to claim 1 or 2, characterized in that: one of the two ends of the primary copper piece is provided with a soldering flux strip.