Mutual inductor unit, mutual inductor module and circuit breaker

Abstract

A mutual inductor unit, a mutual inductor module and a circuit breaker, the mutual inductor unit comprises a housing and a mutual inductor packaged in the housing, the housing comprises a base and a sealing cover, the base is provided with an installation cavity for accommodating the mutual inductor, the sealing cover is used for sealing an opening of the installation cavity, the mutual inductor comprises a metering mutual inductor, a current mutual inductor and a Rogowski coil, and the Rogowski coil is arranged in the installation cavity. The base is further provided with a sleeve penetrating through the metering mutual inductor, the current mutual inductor and the Rogowski coil center hole, and at least one dovetail groove or dovetail component is arranged on the two sides of the base. By arranging the dovetail grooves and the dovetail components, mutual splicing of the mutual inductor units is achieved, meanwhile, a sliding type inserting connection mode is adopted, assembling is more convenient, when any mutual inductor unit breaks down, only one mutual inductor unit needs to be replaced, cost is saved, and resource waste is reduced.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical equipment, and in particular to a mutual inductor unit, a mutual inductor module and a circuit breaker. Background Art

[0002] Transformers, as a signal sampling mechanism, are widely used in electrical switching applications. Their structural principle is to use a transformer to sense the current on the primary side, generating an induced current on the secondary side. Different functions can be achieved by connecting different loads to the secondary side. For example, if the secondary side is connected to a switching power supply circuit, the sampled induced current can be used to power the circuit itself. If the secondary side is connected to a protection component, the induced current can be used to determine whether the primary side current is abnormal (such as a short circuit or overload) for protection purposes. For example, if the secondary side is connected to an energy meter, the induced current can be used to measure power parameters.

[0003] However, most existing transformers are composed of three integrally connected current transformers. Due to their integrated structure, when one of the transformers fails, the entire transformer needs to be replaced, resulting in a waste of resources. Utility Model Content

[0004] In view of the deficiencies in the prior art, the present invention aims to provide a transformer unit, a transformer module and a circuit breaker.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A transformer unit includes a housing and a transformer encapsulated within the housing. The housing includes a base and a cover. The base is provided with a mounting cavity for accommodating the transformer. The cover is used to close the opening of the mounting cavity. The transformer includes a metering transformer, a current transformer, and a Rogowski coil. The base is further provided with a sleeve that passes through the center holes of the metering transformer, the current transformer, and the Rogowski coil. At least one dovetail groove or dovetail component is provided on both sides of the base.

[0007] A plurality of wire outlets are provided on the side of the base where the dovetail groove or the dovetail component is not located, and the output ends of the metering transformer, current transformer and Rogowski coil extend out of the installation cavity through the wire outlets.

[0008] The shape of the tube hole of the sleeve is any one of rectangular, circular, semicircular, elliptical, semi-elliptical and trapezoidal, or a combination of any two of them.

[0009] The metering transformer, current transformer and Rogowski coil are sealed in the shell by epoxy resin.

[0010] The dovetail groove or dovetail component is non-through-arranged on the side surface of the base.

[0011] A mutual inductor module comprises at least two of the above mutual inductor units, wherein the side surfaces of each adjacent mutual inductor unit are respectively provided with corresponding dovetail grooves and dovetail components, and the two realize the splicing of adjacent mutual inductor units through sliding fit.

[0012] A circuit breaker is provided with the above-mentioned mutual inductor unit inside, and the number of the mutual inductor units is set corresponding to the number of main circuit conductors. The mutual inductor unit is sleeved on the main circuit conductor, and adjacent mutual inductor units are integrally spliced ​​through corresponding dovetail grooves and dovetail components.

[0013] The beneficial effects of the present invention are as follows: by setting dovetail grooves and dovetail components, the mutual splicing of the various transformer units is achieved, and at the same time, a sliding plug-in connection method is adopted, which is more convenient during assembly. When any transformer unit fails, only one of the transformer units needs to be replaced, which saves costs and reduces waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of the mutual inductor unit of the present utility model.

[0015] Figure 2 This is an exploded schematic diagram of the transformer unit of the present invention.

[0016] Figure 3 This is a structural schematic diagram of the base of the mutual inductor unit of the present utility model.

[0017] Figure 4 This is a structural diagram of the mutual inductor module of the present utility model. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0020] like Figure 1As shown, the present invention provides a mutual inductor unit, which includes a housing and a mutual inductor encapsulated in the housing. The housing includes a base 100 and a cover 200. The base 100 is provided with a mounting cavity 110 for accommodating the mutual inductor. The cover 200 is used to close the opening of the mounting cavity. Figure 3 As shown, the transformer includes a metering transformer 300, a current transformer 400 and a Rogowski coil 500. The base is also provided with a sleeve 130 that passes through the center holes of the metering transformer 300, the current transformer 400 and the Rogowski coil 500. At least one dovetail groove 120 or dovetail component is provided on both sides of the base 100.

[0021] The dovetail groove or dovetail member may be arranged in a vertical cross section or a parallel cross section, which is the cross section of the mutual inductor unit.

[0022] By arranging corresponding dovetail grooves and dovetail components on the contact surfaces of adjacent mutual inductor units, the two mutual inductor units can be spliced ​​together to achieve integral installation.

[0023] like Figure 2 As shown, three types of transformers are used: a metering transformer, a current transformer, and a Rogowski transformer to achieve different functions. The metering transformer provides power parameters for the metering circuit to calculate power; the current transformer performs current detection; and the Rogowski coil provides more accurate power parameters for circuit breaker protection. Compared to existing technologies, the Rogowski coil has an unsaturated characteristic and high precision. This allows it to output more accurate values ​​even when the internal temperature of the product rises, facilitating short-circuit protection.

[0024] Several cable outlets 140 are provided on the side of the base that is not the dovetail groove or dovetail member. The output terminals of the metering transformer 300, current transformer 400, and Rogowski coil 500 extend out of the mounting cavity 110 through these cable outlets 140. Each output terminal can be a lead or terminal block that extends through the cable outlet to facilitate electrical connection to the control circuit board inside the circuit breaker.

[0025] The shape of the tube hole of the sleeve 130 is any one of rectangular, circular, semicircular, elliptical, semi-elliptical, and trapezoidal, or a combination of any two of them.

[0026] Different shapes of casings are used to meet the insertion requirements of different main circuit conductors.

[0027] The metering transformer 300, the current transformer 400 and the Rogowski coil 500 are potted in the housing with epoxy resin. Potting with epoxy resin is beneficial to improving the insulation performance of the transformer unit and improving the stability of the transformer unit.

[0028] The dovetail groove 120 or dovetail component is non-through arranged on the side of the base. With a non-through design, one end can play a limiting role during sliding fit, avoiding that any side of the two cannot be in the same plane during re-fitting, thereby ensuring that adjacent mutual inductor units are in the same plane when fitted.

[0029] like Figure 4 As shown, the present invention also provides a transformer module, which includes at least two transformer units 10 described above, and the side surfaces of each adjacent transformer unit 10 are respectively provided with corresponding dovetail grooves and dovetail members, and the two are adapted to achieve the splicing of adjacent transformer units through sliding fit. By splicing multiple transformer units to form an integrated transformer module, if any transformer unit fails, it can be replaced by replacing a single transformer unit instead of replacing all of them, thus reducing costs.

[0030] At the same time, the utility model also provides a circuit breaker, which replaces the conventional transformer unit with the above-mentioned several transformer units 10, and the number of the transformer units 10 is set corresponding to the number of main circuit conductors, and the transformer units are sleeved on the main circuit conductors, and adjacent transformer units 10 are integrally spliced ​​through corresponding dovetail grooves and dovetail components.

[0031] The embodiments should not be regarded as limiting the present invention, but any improvements based on the spirit of the present invention should be within the scope of protection of the present invention.

Claims

1. A mutual inductor unit comprising a housing and a mutual inductor encapsulated in the housing, characterized in that: The housing comprises a base (100) and a cover (200); the base (100) is provided with an installation cavity (110) for accommodating a transformer; the cover (200) is used to close an opening of the installation cavity; the transformer comprises a metering transformer (300), a current transformer (400) and a Rogowski coil (500); the base is further provided with a sleeve (130) penetrating the center holes of the metering transformer (300), the current transformer (400) and the Rogowski coil (500); and at least one dovetail groove (120) or dovetail component is provided on both sides of the base (100).

2. The mutual inductor unit according to claim 1, characterized in that: A plurality of wire outlets (140) are provided on a side of the base where the dovetail groove or dovetail component is not located, and output ends of the metering transformer (300), current transformer (400) and Rogowski coil (500) extend out of the installation cavity (110) via the wire outlets (140).

3. The mutual inductor unit according to claim 1, characterized in that: The shape of the tube hole of the sleeve (130) is any one of rectangular, circular, semicircular, elliptical, semi-elliptical, and trapezoidal, or a combination of any two of them.

4. The mutual inductor unit according to claim 1, characterized in that: The metering transformer (300), the current transformer (400) and the Rogowski coil (500) are encapsulated in the housing by epoxy resin.

5. The mutual inductor unit according to claim 1, characterized in that: The dovetail groove (120) or the dovetail component is non-through-arranged on the side of the base.

6. A mutual inductor module, characterized in that: It comprises at least two mutual inductor units (10) according to any one of claims 1 to 5, and the side surfaces of each adjacent mutual inductor unit (10) are respectively provided with corresponding dovetail grooves and dovetail components, and the two realize the splicing of adjacent mutual inductor units through sliding fit.

7. A circuit breaker, characterized in that: The circuit breaker is provided with a mutual inductor unit (10) as described in any one of claims 1 to 5, and the number of the mutual inductor units (10) is set corresponding to the number of main circuit conductors, and the mutual inductor unit is sleeved on the main circuit conductor, and adjacent mutual inductor units (10) are integrally spliced ​​through corresponding dovetail grooves and dovetail components.

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