Three-phase four-wire current transformer convenient to install

Abstract

The utility model discloses a three-phase four-wire current transformer capable of being conveniently installed, which comprises a transformer shell, a plurality of current transformers and a plurality of current transformers, the cover plate is fixedly connected with the mutual inductor shell; the three live wires comprise a phase A, a phase B and a phase C, and the phase A, the phase B and the phase C are fixedly connected with the cover plate respectively; and the null line N is fixedly connected with the cover plate. The utility model relates to the technical field of current transformers, in particular to a three-phase four-wire current transformer convenient to install. The technical problem to be solved by the utility model is to provide a three-phase four-wire current transformer which can be conveniently installed, which is favorable for reducing the number of dies and reducing the volume of the transformer.

Description

TECHNICAL FIELD

[0001] The utility model relates to current transformer technical field, concretely is a three -phase four -wire current transformer that can install conveniently. BACKGROUND

[0002] Current transformer is mainly composed of core, primary winding, secondary winding, terminal and insulating support etc. Its working principle is based on Faraday's law of electromagnetic induction, that is, when the magnetic flux through the closed loop changes, the induced electromotive force will be generated in the loop. The primary winding has few turns and is directly connected in the current line to be measured, so the whole current of the line often flows. The secondary winding has more turns and is connected in the measuring instrument and protection circuit. When the primary current generates alternating magnetic flux in the core, the alternating magnetic flux passes through the primary winding and the secondary winding, thereby generating an induced electromotive force in the secondary winding. If the secondary winding is connected with a load, a current will flow in the secondary circuit.

[0003] The traditional three -phase four -wire current transformer adopts the structure that ABC three -phase live line is integrated and the neutral line is separated, the current transformer occupies large space, is not favorable for the cost reduction of customer terminal, and the customer needs to install separately when installing, the process is complicated, and sometimes the installation deviation easily causes mutual interference, the three -phase four -wire integrated together in the application can effectively improve the above problems. CONTENT OF THE UTILITY MODEL

[0004] The utility model solves the technical problem to provide a three -phase four -wire current transformer that can install conveniently, is favorable for realizing the reduction of mold quantity and the reduction of current transformer size.

[0005] The utility model adopts the following technical scheme to realize the utility model purpose:

[0006] A three -phase four -wire current transformer that can install conveniently, characterized in that, it comprises: a current transformer shell, which is hollow; a cover plate, which is fixedly connected to the current transformer shell; three live lines, including A phase, B phase and C phase, the A phase, the B phase and the C phase are fixedly connected to the cover plate respectively; a neutral line N, which is fixedly connected to the cover plate. Not only can the mold quantity be reduced and the current transformer size be reduced, but also the installation process of the customer can be reduced, and the three -phase four -wire one -step installation is realized. The three -phase four -wire current transformer integrated in the structure of the device has accurate pin size, small size, can install the ABC (live line) N (neutral line) four -wire one -step in place, and helps the customer to reduce the installation process, so that the installation efficiency of the customer is greatly improved.

[0007] As a further limitation of the technical solution, the A phase includes a primary current input end first pin and a primary current output end first pin, the B phase includes a primary current input end second pin and a primary current output end second pin, the C phase includes a primary current input end third pin and a primary current output end third pin, and the primary current input end first pin, the primary current output end first pin, the primary current input end second pin, the primary current output end second pin, the primary current input third end pin and the primary current output third end pin are fixedly connected to the cover plate.

[0008] As a further limitation of the technical solution, the zero line N includes a primary current input end fourth pin and a primary current output end fourth pin, and the primary current input end fourth pin and the primary current output end fourth pin are fixedly connected to the cover plate.

[0009] As a further limitation of the technical solution, the two pins of the zero line N are fixedly connected to the cover plate.

[0010] As a further limitation of the technical solution, the hot plug is injection molded with the cover plate, and can be reduced according to customer requirements, so as to realize switching of the current transformer from three-phase four-wire to three-phase three-wire without changing the appearance.

[0011] As a further limitation of the technical solution, the cover plate is provided with a group of wire holes for leading out secondary current leads.

[0012] As a further limitation of the technical solution, the cover plate is provided with a group of pouring holes for four-wire integrated pouring forming.

[0013] Compared with the related art, the three-phase four-wire current transformer provided by the utility model has the following beneficial effects:

[0014] (1) The device adopts a structure of three-phase four-wire integration, which not only reduces the number of molds and the size of the current transformer, but also helps customers reduce installation procedures and realize one-step installation of three-phase four-wire.

[0015] (2) The three-phase four-wire current transformer integrated in the device has accurate pin size and small size, and can be installed in place in one step, which helps customers reduce installation procedures and greatly improves customer installation efficiency. The two pins of the N line are hot-plugged and injection molded on the cover plate, which can be reduced according to customer requirements, so as to realize seamless switching from three-phase four-wire to three-phase three-wire without changing the appearance of the body. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a top view of the utility model;

[0017] Figure 2 is a partial front view of the utility model;

[0018] Figure 3 is a partial three-dimensional structure schematic view of the utility model;

[0019] Figure 4 is a three-dimensional structure schematic view of the utility model.

[0020] In the figure: 1, the first pin of primary current input end; 2, the second pin of primary current input end; 3, the third pin of primary current input end; 4, the fourth pin of primary current input end; 5, the fourth pin of primary current output end; 6, the third pin of primary current output end; 7, the second pin of primary current output end; 8, the first pin of primary current output end; 9, wire hole; 10, hot plug; 11, cover plate; 12, pouring hole. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0022] Embodiment one: a three-phase four-wire current transformer which can be conveniently installed, comprising: a transformer shell which is hollow; a cover plate 11 fixedly connected with the transformer shell; three live wires including phase A, phase B and phase C, the phase A, the phase B and the phase C being fixedly connected with the cover plate 11 respectively; and a neutral wire N fixedly connected with the cover plate 11. Not only can the number of molds be reduced and the volume of the transformer be reduced, but also the installation process of the customer can be reduced, and one-step installation of three-phase four-wire is realized. The three-phase four-wire transformer integrated in one body adopted by the device is accurate in pin size and small in volume, can install ABC (live wire) N (neutral wire) four-wire in one step, helps the customer to reduce the installation process, and greatly improves the installation efficiency of the customer.

[0023] The A phase includes a first pin 1 of primary current input end and a first pin 8 of primary current output end, the B phase includes a second pin 2 of primary current input end and a second pin 7 of primary current output end, the C phase includes a third pin 3 of primary current input end and a third pin 6 of primary current output end, and the first pin 1 of primary current input end, the first pin 8 of primary current output end, the second pin 2 of primary current input end, the second pin 7 of primary current output end, the third pin 3 of primary current input end and the third pin 6 of primary current output end are fixedly connected with the cover plate 11.

[0024] The neutral line N includes a fourth pin 4 of primary current input end and a fourth pin 5 of primary current output end, and the fourth pin 4 of primary current input end and the fourth pin 5 of primary current output end are fixedly connected with the cover plate 11.

[0025] The two pins of the neutral line N are fixedly connected with the cover plate 11 through the hot plug 10.

[0026] The hot plug 10 is fixedly connected with the cover plate 11 through injection molding, and can be deleted according to customer demand, so that the three-phase four-wire to three-phase three-wire switching of the mutual inductor is realized without changing the appearance.

[0027] The cover plate 11 is provided with a group of wire holes 9 for leading out secondary current lead wires.

[0028] The cover plate 11 is provided with a group of pouring holes 12 for four-wire integrated pouring forming.

[0029] The above only describes the embodiments of the utility model, and does not limit the patent range of the utility model, and any equivalent structure or equivalent process transformation according to the content of the utility model specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection range of the utility model.

Claims

1. A three-phase four-wire current transformer which can be installed easily, characterized in that, It includes: The transformer shell is hollow inside; Cover plate (11), fixedly connected with the transformer shell; Three fire lines, including A, B and C phases, the A, B and C phases are fixedly connected with the cover plate (11); The zero line N is fixedly connected with the cover plate (11).

2. The three-phase four-wire current transformer of claim 1, wherein: The A phase includes a first pin (1) of the primary current input end and a first pin (8) of the primary current output end, the B phase includes a second pin (2) of the primary current input end and a second pin (7) of the primary current output end, the C phase includes a third pin (3) of the primary current input end and a third pin (6) of the primary current output end, the first pin (1) of the primary current input end, the first pin (8) of the primary current output end, the second pin (2) of the primary current input end, the second pin (7) of the primary current output end, the third pin (3) of the primary current input end and the third pin (6) of the primary current output end are fixedly connected with the cover plate (11).

3. The three-phase four-wire current transformer of claim 1, wherein: The zero line N includes a fourth pin (4) of the primary current input end and a fourth pin (5) of the primary current output end, and the fourth pin (4) of the primary current input end and the fourth pin (5) of the primary current output end are fixedly connected with the cover plate (11).

4. The three-phase four-wire current transformer of claim 3, wherein: The two pins of the zero line N are fixedly connected with the cover plate (11) through the hot plug (10).

5. The three-phase four-wire current transformer of claim 4, wherein: The hot plug (10) is fixedly connected with the cover plate (11) by injection molding.

6. The three-phase four-wire current transformer of claim 1, wherein: The cover plate (11) is provided with a group of wire holes (9) for leading out the secondary current lead wire.

7. The three-phase four-wire current transformer of claim 1, wherein: The cover plate (11) is provided with a group of perfusion holes (12).

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