An enclosed transformer assembly within a circuit breaker

Abstract

The utility model provides a closed mutual inductor assembly in circuit breaker, and the circuit breaker includes the base and the cover plate of cover set above the base, the mutual inductor assembly sets up between the base and the cover plate, and the mutual inductor assembly includes the casing and at least two mutual inductors of mutual independence setting in the casing, be provided with the shield cover for wrapping the magnetic flux tripping device at casing, and this closed mutual inductor assembly can form the barrier protection to the magnetic flux tripping device, prevents the tripping device failure.

Description

Technical Field

[0001] This utility model relates to the field of instrument transformer technology, specifically to a closed instrument transformer assembly inside a circuit breaker. Background Technology

[0002] The core function of the instrument transformer assembly within the circuit breaker is to monitor the current in the circuit in real time. Through the principle of electromagnetic induction, it converts high-voltage, high-current signals into low-voltage, low-current signals, providing accurate measurement data for the circuit breaker's protection and control. It also triggers rapid tripping action in case of a fault. The flux trip unit, located within the instrument transformer assembly, detects abnormal changes in the zero-sequence current and drives a mechanical mechanism to quickly disconnect the circuit, thus achieving the protection function. In existing technology, the flux trip unit is exposed between two instrument transformers without a protective casing. When the moving and stationary contacts break, charged particles are generated. Although most of these charged particles enter the arc-extinguishing chamber, because the arc disperses in all directions after the break, a small portion of the charged particles move towards one side of the flux trip unit. If these charged particles adhere to the flux trip unit, it can easily lead to flux failure. Furthermore, this structure is prone to phase-to-phase breakdown of the incoming line, causing the circuit breaker to fail. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to overcome the defect in the prior art that a small number of charged particles will move toward one side of the flux trip unit, and the charged particles will attach to the flux trip unit, which will easily lead to the failure of the flux function. Thus, this invention provides a closed current transformer assembly in a circuit breaker that can protect the flux trip unit.

[0004] Therefore, this utility model provides a closed current transformer assembly inside a circuit breaker. The circuit breaker includes a base and a cover plate covering the base. The current transformer assembly is disposed between the base and the cover plate. The current transformer assembly includes a housing and at least two current transformers independently disposed inside the housing. The housing is provided with a shield for wrapping the flux trip unit.

[0005] Furthermore, the circuit breaker also includes a mechanism, and the magnetic flux trip device also includes a push rod that extends outside the shield and is linked to the mechanism.

[0006] Furthermore, the current transformer assembly also includes an adapter plate connected to the current transformer by a wire, a circuit board is disposed on the top of the adapter plate, the adapter plate and the circuit board are connected by hot-plugging, and a shielding groove extends from the shielding cover to wrap the adapter plate and the circuit board.

[0007] Furthermore: a baffle is provided between adjacent current transformers inside the housing, and a first wiring groove is provided on the baffle for the wiring harness of the current transformer to pass through. A second wiring groove is provided between the housing and the adapter plate for the wiring harness to be inserted into the adapter plate.

[0008] Furthermore: an abutment assembly is provided between the housing and the cover plate. The abutment assembly includes a first abutment frame and a second abutment frame abutting against both sides of the shield. The first abutment frame and the second abutment frame are injection molded with the cover plate and extend to the upper position of the housing, abutting against the housing.

[0009] Furthermore, a snap-fit ​​structure is provided between the shielding cover or housing and the cover plate.

[0010] Furthermore: the snap-fit ​​structure includes a snap-fit ​​block disposed on one side of the shield or cover plate and a snap-fit ​​groove disposed on the other side and adapted to the snap-fit ​​block.

[0011] Furthermore, the connection between the housing and the base is provided with a plug-in structure, which includes a plug-in block disposed on one side of the housing or the base and a plug-in slot disposed on the other side and adapted to the plug-in block.

[0012] Furthermore: a positioning structure for connecting the housing and the shielding cover is provided between them. The positioning structure includes a fastening block provided on one side of the housing or the shielding cover and a fastening groove provided on the other side and adapted to the fastening block. Fastening pins for positioning the housing and the shielding cover are also provided between them.

[0013] Furthermore, the cover plate is provided with a shielding cover that covers the outer periphery of the shielding groove.

[0014] The technical solution of this utility model has the following advantages: 1. The present invention provides a closed current transformer assembly in a circuit breaker, wherein a shielding cover is provided outside the flux trip unit. The shielding cover includes the coil and spring of the flux trip unit. By setting the shielding cover to wrap around the outside of the flux trip unit, charged particles can be effectively blocked, thereby preventing trip unit failure.

[0015] 2. This utility model provides a closed current transformer assembly inside a circuit breaker. The circuit breaker encloses a mechanism. To ensure that the magnetic flux trip device can smoothly link with the mechanism, a shielding cover encloses the coil and spring parts of the magnetic flux trip device. The push rod extends to the outside of the shielding cover. The push rod is made of plastic and has good insulation performance. Therefore, even if it comes into contact with charged particles, it will not cause the magnetic flux trip device to fail. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the current transformer assembly. Figure 2 This is a schematic diagram of the connection structure between the current transformer assembly and the shielding cover. Figure 3 A schematic diagram of a current transformer assembly with part of its housing removed; Figure 4 This is a diagram showing the positional relationship between the current transformer assembly and the base; Figure 5 This is a schematic diagram of the cover plate structure; Figure 6 This is another structural schematic diagram of the cover plate; Figure 7 for Figure 6 Enlarged view of section A in the middle; Figure 8 This is a sectional view of the connection structure between the shell and the base; Figure 9 for Figure 8 Enlarged view of section B in the middle.

[0018] Explanation of reference numerals in the attached figures: 1. Base; 2. Cover plate; 3. Housing; 31. Baffle; 32. First wiring channel; 33. Second wiring channel; 4. Current transformer; 5. Flux trip unit; 50. Push rod; 51. Shielding cover; 52. Shielding groove; 6. Mechanism; 7. Adapter plate; 71. Circuit board; 8. Abutment assembly; 81. First abutment frame; 82. Second abutment frame; 9. Snap-fit ​​structure; 91. Snap-fit ​​block; 92. Snap-fit ​​groove; 10. Insertion structure; 101. Insertion block; 102. Insertion groove; 93. Positioning structure; 94. Fastening block; 95. Fastening groove; 96. Fastening nail; 97. Shielding cover. Detailed Implementation

[0019] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0023] Example This embodiment provides a closed current transformer assembly inside a circuit breaker. The circuit breaker includes a base 1 and a cover plate 2 covering the base 1. The current transformer assembly is disposed between the base 1 and the cover plate 2. The current transformer assembly includes a housing 3 and at least two current transformers 4 independently disposed inside the housing 3. A shielding cover 51 for wrapping the magnetic flux trip unit 5 is provided at the housing 3.

[0024] The specific improvements mentioned above are as follows: Figures 1-4 As shown, compared with the prior art, a shield 51 is provided on the outside of the magnetic flux trip device 5. The shield 51 includes the coil and spring of the magnetic flux trip device 5 (when the moving and stationary contacts separate, an electric arc is generated. Although most of the charged particles in the arc will enter the arc extinguishing chamber, since the direction of the arc dispersion is irregular, a small portion will move through the gap between the base 1 and the cover plate 2 and attach to the coil and spring of the magnetic flux trip device 5, thus causing the magnetic flux trip device 5 to fail). By setting the shield 51 to wrap around the outside of the magnetic flux trip device 5, charged particles can be effectively blocked, thereby preventing the trip device from failing.

[0025] Based on the above embodiments: the circuit breaker further includes mechanism 6, and the magnetic flux trip device 5 further includes push rod 50, which extends to the outside of the shield 51 and is linked with mechanism 6.

[0026] The specific improvements mentioned above are as follows: Figure 4 As shown, the circuit breaker is enclosed by mechanism 6. To ensure that the magnetic flux trip device 5 can be smoothly linked with mechanism 6, shield 51 encloses the coil and spring of magnetic flux trip device 5 and extends push rod 50 to the outside of shield 51. Push rod 50 is made of plastic and has good insulation performance, so even if it comes into contact with charged particles, it will not cause magnetic flux trip device 5 to fail.

[0027] Based on the above embodiments: the current transformer assembly further includes a converter plate 7 connected to the current transformer 4 by a wire, a circuit board 71 is disposed on the top of the converter plate 7, the converter plate 7 and the circuit board 71 are connected by hot-plug connection, and a shielding groove 52 extending from the shielding cover 51 to wrap the converter plate 7 and the circuit board 71.

[0028] Based on the above embodiments: a baffle 31 is provided between adjacent current transformers 4 inside the housing 3, and a first wiring groove 32 is provided on the baffle 31 for the wire harness of the current transformer 4 to pass through. A second wiring groove 33 is provided between the housing 3 and the adapter plate 7 for the wire harness to be inserted into the adapter plate 7.

[0029] The specific improvements mentioned above are as follows: Figure 3 As shown, the current transformer 4 assembly contains current transformer A, current transformer B, and current transformer C. The housing 3 completely encloses the current transformer 4, and the front and rear sides of the housing 3 provide insulation for the current transformer 4 to prevent breakdown. The wires of current transformer A, current transformer B, and current transformer C pass through the first wiring groove 32 at the baffle 31, and then exit through the second wiring groove 33 and connect to the adapter plate 7. The adapter plate 7 is then hot-swappable connected to the circuit board above, which improves the convenience of replacing the controller and reduces maintenance costs. The housing 3 has a built-in wire harness slot to prevent wire compression. The independent cavity of the current transformer 4 provides isolation to prevent phase-to-phase dielectric breakdown caused by damage to the traditional insulation. The adapter plate 7 is installed inside the shielding cover 51, and the cover plate 2 covers it from above, thus forming a sealed space inside the shielding cover 51, which protects the circuit board 71 and prevents charged particles generated by the breakage of the moving and stationary contacts from affecting the circuit board 71.

[0030] Based on the above embodiments: an abutting component 8 is provided between the housing 3 and the cover plate 2. The abutting component 8 includes a first abutting frame 81 and a second abutting frame 82 abutting against both sides of the shield 51. The first abutting frame 81 and the second abutting frame 82 are injection molded with the cover plate 2 and extend to the upper position of the housing 3, and abut against the housing 3.

[0031] The specific improvements mentioned above are as follows: Figure 5As shown, an abutment assembly 8 is provided between the housing 3 and the cover plate 2. The abutment assembly 8 includes a first abutment frame 81 and a second abutment frame 82. The housing 3 may shake when installed in the base. The lower end surfaces of the first abutment frame 81 and the second abutment frame 82 abut against the upper end surface of the housing 3, and their sides abut against the two sides of the shielding cover 51. Therefore, by setting the first abutment frame 81 and the second abutment frame 82, one can prevent the housing 3 and the shielding cover 51 from shaking, and the two can form a barrier to shield the rear space, preventing charged particles between the A mutual sensor and the C mutual sensor from contacting and forming a short circuit.

[0032] Based on the above embodiments: a snap-fit ​​structure 9 is provided between the shielding cover 51 or the housing 3 and the cover plate 2.

[0033] Based on the above embodiments: the snap-fit ​​structure 9 includes a snap-fit ​​block 91 disposed on one side of the shield 51 or the cover plate 2, and a snap-fit ​​groove 92 disposed on the other side and adapted to the snap-fit ​​block 91.

[0034] The specific improvements mentioned above are as follows: Figure 6 and Figure 7 As shown, the snap-fit ​​groove 92 is provided on the shielding cover 51 and the housing 3, and the snap-fit ​​block 91 is provided on the cover plate 2. Through the snap-fit ​​structure 9, charged particles can be effectively isolated and insulation performance can be guaranteed.

[0035] Based on the above embodiments: a plug-in structure 10 is provided at the connection between the housing 3 and the base 1. The plug-in structure 10 includes a plug-in block 101 disposed on one of the housing 3 or the base 1 and a plug-in groove 102 disposed on the other and adapted to the plug-in block 101.

[0036] The specific improvements mentioned above are as follows: Figure 8 and Figure 9 As shown, the plug block 101 is mounted on the base 1, and the plug slot 102 is mounted on the housing 3. The combination of the plug block 101 and the plug slot 102 increases the creepage distance between the two copper components inside the circuit breaker and improves the dielectric performance.

[0037] Based on the above embodiments: a positioning structure 93 for connecting the housing 3 and the shielding cover 51 is provided between the housing 3 and the shielding cover 51. The positioning structure 93 includes a fastening block 94 disposed on one of the housing 3 or the shielding cover 51 and a fastening groove 95 disposed on the other and adapted to the fastening block 94. A fastening nail 96 for positioning the housing 3 and the shielding cover 51 is also provided between the housing 3 and the shielding cover 51.

[0038] The specific improvements mentioned above are as follows: Figure 2As shown, in order to ensure that the housing 3 and the shielding cover 51 can be effectively connected, the two sides of the housing 3 and the two sides of the shielding cover 51 are fastened together for the first locking, and fastening nails 96 are driven into the housing 3 and the shielding cover 51 for the second locking.

[0039] Based on the above embodiments: the cover plate 2 is provided with a shielding cover 97 covering the outer periphery of the shielding groove 52.

[0040] The specific improvements mentioned above are as follows: Figure 5 As shown, in order to ensure the sealing of the shielding groove 52, a shielding cover 97 is provided on the cover plate 2 to cover the outer periphery of the shielding groove 52. The shielding cover 97 wraps the shielding groove 52 to prevent charged particles from contacting the circuit board 71 and causing the circuit board 71 to fail.

[0041] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A closed-type instrument transformer assembly within a circuit breaker, the circuit breaker comprising a base (1) and a cover plate (2) disposed above the base (1), the instrument transformer assembly being disposed between the base (1) and the cover plate (2), characterized in that: The current transformer assembly includes a housing (3) and at least two current transformers (4) independently disposed inside the housing (3), wherein a shield (51) for enclosing the flux trip unit (5) is provided at the housing (3).

2. The enclosed instrument transformer assembly within a circuit breaker according to claim 1, characterized in that: The circuit breaker also includes a mechanism (6), and the magnetic flux trip device (5) also includes a push rod (50), which extends outside the shield (51) and is linked with the mechanism (6).

3. A closed-type instrument transformer assembly within a circuit breaker according to claim 1 or 2, characterized in that: The transformer assembly also includes a converter plate (7) connected to the transformer (4) by a wire. A circuit board (71) is provided on the top of the converter plate (7). The converter plate (7) and the circuit board (71) are connected by hot-plug. A shielding groove (52) extends from the shield (51) to wrap the converter plate (7) and the circuit board (71).

4. The enclosed instrument transformer assembly within a circuit breaker according to claim 3, characterized in that: A baffle (31) is provided between adjacent current transformers (4) inside the housing (3). A first wiring groove (32) for the wire harness of the current transformer (4) to pass through is provided on the baffle (31). A second wiring groove (33) for the wire harness to be inserted into the adapter plate (7) is provided between the housing (3) and the adapter plate (7).

5. A closed-type instrument transformer assembly within a circuit breaker according to any one of claims 1-2, characterized in that: An abutting component (8) is provided between the housing (3) and the cover plate (2). The abutting component (8) includes a first abutting frame (81) and a second abutting frame (82) abutting against both sides of the shield (51). The first abutting frame (81) and the second abutting frame (82) are injection molded with the cover plate (2) and extend to the upper position of the housing (3) and abut against the housing (3).

6. The enclosed instrument transformer assembly within a circuit breaker according to claim 3, characterized in that: A snap-fit ​​structure (9) is provided between the shield (51) or shell (3) and the cover plate (2).

7. The enclosed instrument transformer assembly within a circuit breaker according to claim 6, characterized in that: The snap-fit ​​structure (9) includes a snap-fit ​​block (91) disposed on one side of the shield (51) or the cover plate (2) and a snap-fit ​​groove (92) disposed on the other side and adapted to the snap-fit ​​block (91).

8. The enclosed instrument transformer assembly within a circuit breaker according to claim 7, characterized in that: A plug-in structure (10) is provided at the connection between the housing (3) and the base (1). The plug-in structure (10) includes a plug-in block (101) disposed on one of the housing (3) or the base (1) and a plug-in groove (102) disposed on the other and adapted to the plug-in block (101).

9. A closed-type instrument transformer assembly within a circuit breaker according to claim 8, characterized in that: A positioning structure (93) for connecting the housing (3) and the shield (51) is provided. The positioning structure (93) includes a fastening block (94) disposed on one of the housing (3) or the shield (51) and a fastening groove (95) disposed on the other and adapted to the fastening block (94). A fastening pin (96) for positioning the two is also provided between the housing (3) and the shield (51).

10. A closed-type instrument transformer assembly within a circuit breaker according to claim 3, characterized in that: The cover plate (2) is provided with a shielding cover (97) covering the outer periphery of the shielding groove (52).

Images