Current transformer

Abstract

The utility model discloses a current transformer which comprises a transformer shell and a secondary wire holder, a coil is embedded in the transformer shell, the secondary wire holder comprises a mounting piece, a conducting strip embedded in the mounting piece, an O-shaped wire clip and a locking screw, a short joint is arranged on the conducting strip, and the O-shaped wire clip is arranged on the short joint. The conducting strip extends out of a connecting piece laterally, penetrates through the mounting piece and extends into the mutual inductor main body; the current transformer is used for high-voltage cable measurement, the main body structure of the current transformer is simple and practical, the primary and secondary wiring structure design is reasonable, the cable groove has various shapes, the measurement is more comprehensive, and the current transformer is suitable for measurement and use of various cable currents and other various data.

Description

Technical Field

[0001] This utility model relates to the field of electrical technology, specifically to a current transformer. Background Technology

[0002] A current transformer is a current conversion device with the dual functions of current transformation and isolation. It converts large currents in high-voltage or low-voltage circuits into small, low-voltage currents to supply instruments and relay protection devices for measurement, metering, and protection. Existing technology discloses a current transformer comprising a transformer body with a secondary terminal block structure. However, in existing designs, the secondary terminal block is directly integrated with the transformer housing, with the conductive strips extending directly outside the housing, exposing the secondary terminals. Furthermore, the commonly used wire-wound locking method for wiring is cumbersome. Utility Model Content

[0003] The purpose of this utility model is to provide a simple current transformer with a simple assembly structure that facilitates assembly, repair and maintenance, and meets the usage requirements of current transformers.

[0004] The technical solution adopted by this utility model is as follows: a current transformer, including a transformer housing with an embedded coil and a secondary terminal block. The secondary terminal block includes a mounting component, a conductive sheet embedded in the mounting component, an O-ring, and a locking screw. The conductive sheet is provided with a short connector, and the conductive sheet extends to the side, passes through the mounting component, and extends into the transformer body.

[0005] As a further feature of the above solution, the mounting component is provided with an arc-shaped groove, and the conductive sheet is fitted and fixed in the arc-shaped groove.

[0006] As a further feature of the above solution, the O-ring buckle has a threaded hole relative to the locking screw, and the end of the locking screw abuts against the upper surface of the conductive sheet that passes through the O-ring buckle.

[0007] As a further feature of the above solution, the mounting component is provided with a lifting groove larger than the size of the O-ring buckle.

[0008] As a further provision of the above scheme, the transformer housing includes two mirror-mounted side shell plates. The side shell plates are provided with coil grooves. Support parts and snap-fit ​​structures for the two side shell plates to fasten together are provided on the outer side of the side shell plates. The support parts are threaded with locking screws, and the locking screws are positioned opposite the cable through holes of the transformer housing.

[0009] Beneficial effects: The current transformer of this utility model is used for high-voltage cable measurement. Its main structure is simple and practical, the primary and secondary wiring structure is reasonably designed, and the cable tray has a variety of shapes for more comprehensive measurement. It is suitable for various measurements and uses of cable current and other data. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the current transformer structure of this utility model.

[0011] Figure 2 This is a schematic diagram of the internal components of the current transformer in this embodiment.

[0012] Reference numerals: 1. Transformer housing; 10. Arc-shaped groove; 11. Mounting component; 12. Conductive sheet; 13. O-ring; 14. Locking screw; 15. Short connector; 16. Lifting groove; 17. Snap-fit ​​structure; 18. Support part; 19. Locking screw; 2. Secondary terminal block. Detailed Implementation

[0013] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments and features described in these embodiments can be combined with each other.

[0014] like Figure 1-2 The current transformer shown includes a transformer housing 1 with an embedded coil and a secondary terminal block 2, as shown. Figure 1 The transformer housing 1 shown in this embodiment has a ring-shaped structure, and a measuring coil is embedded inside it. A secondary terminal block 2 is provided on the transformer housing 1. The secondary terminal block 2 includes a mounting component 11, a conductive sheet 12 embedded in the mounting component 11, an O-ring clip 13, and a locking screw 14. The conductive sheet 12 is provided with a short connector 15. When needed, the short connectors 15 of the conductive sheets 12 on both sides can be quickly connected and installed by extending conductive material from the top. In this embodiment, the conductive sheet 12 extends to the side and passes through the mounting component 1. 1. The device is inserted into the main body of the transformer. During use, the cable to be tested is passed through the cable port in the middle of the transformer housing 1. Then, the measuring device is connected to the secondary wiring port and inserted. By tightening the locking screw 14, the O-ring 13 is driven to move upward and the wiring clamp is attached to the conductive sheet 12. Compared with the prior art, the secondary wiring assembly of this embodiment is detachable from the transformer housing 1, which is convenient for assembly and use. In addition, this embodiment adopts a wire clamping and locking structure for wiring, which has better contact stability and is more convenient to install than the traditional coiled wire fixing.

[0015] As a further feature of the above solution, the mounting component 11 is provided with an arc-shaped groove 10, and the conductive sheet 12 is fitted and fixed within the arc-shaped groove 10, such as... Figure 2 The mounting component 11 shown in this embodiment is configured as two mirror halves, with an arc-shaped slot 10 in the middle. The conductive sheet 12 is secured in the arc-shaped slot 10.

[0016] As a further feature of the above solution, the O-ring buckle 13 is provided with a threaded hole relative to the locking screw 14. The end of the locking screw 14 abuts against the upper surface of the conductive piece 12 that passes through the O-ring buckle 13. In use, the O-ring buckle 13 is driven by the threaded engagement between the locking screw 14 and the O-ring buckle 13, and the O-ring buckle 13 moves relative to the conductive piece 12 to clamp or release the cable for quick connection.

[0017] As a further feature of the above solution, the mounting component 11 is provided with a lifting groove 16 that is larger than the size of the O-ring buckle 13.

[0018] As a further provision of the above scheme, the transformer housing 1 includes two mirror-image side shell plates. Each side shell plate has a coil groove. A support portion 18 and a snap-fit ​​structure 17 for the two side shell plates to engage with each other are provided on the outer surface of the side shell plates. A locking screw 19 is threaded onto the support portion 18, and the locking screw 19 is positioned directly opposite the cable through-hole of the transformer housing 1. Figure 2 In the component assembly structure shown in this embodiment, the cable extends from one side of the transformer housing 1, and the locking screw 19 retracts and locks the cable relative to the support portion 18 to keep it in use.

[0019] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of this utility model and its equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A current transformer, comprising a transformer housing (1) with an embedded coil and a secondary terminal block (2), characterized in that: The secondary terminal block (2) includes a mounting component (11), a conductive sheet (12) embedded in the mounting component (11), an O-ring (13) and a locking screw (14). The conductive sheet (12) is provided with a short connector (15). The conductive sheet (12) extends to the side, passes through the mounting component (11), and extends into the transformer body.

2. A current transformer according to claim 1, characterized in that: The mounting component (11) is provided with an arc-shaped slot (10), and the conductive sheet (12) is fitted and fixed in the arc-shaped slot (10).

3. A current transformer according to claim 1, characterized in that: The O-ring buckle (13) has a threaded hole relative to the locking screw (14), and the end of the locking screw (14) abuts against the upper end face of the conductive piece (12) that passes through the O-ring buckle (13).

4. A current transformer according to claim 1, characterized in that: The mounting component (11) is provided with a lifting groove (16) larger than the size of the O-ring buckle (13).

5. A current transformer according to claim 1, characterized in that: The transformer housing (1) includes two mirror-mounted side shell plates. The side shell plates are provided with coil grooves. A support part (18) and a snap-fit ​​structure (17) for the two side shell plates to fasten together are provided on the outer side of the side shell plates. The support part (18) is threaded with a locking screw (19). The locking screw (19) is positioned opposite the cable through hole of the transformer housing (1).

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