An arc fault protection relay

Abstract

This utility model relates to the field of relay technology, specifically an arc fault protection relay. The utility model includes a first housing, with a back plate connected to the back of the first housing by screws. A second housing is fixedly installed on the outer wall of the first housing. A movable opening is formed through the outer wall of the second housing, and a handle is movably installed inside the opening. A metal sheet is fixedly installed inside the first housing, located on one side of the circuit board. A circuit board is also fixedly installed inside the first housing, with an interface fixedly installed on the outer wall of the circuit board. A current transformer (first and second) is installed near the bottom inside the first housing, and cables are installed inside both current transformers. This utility model effectively reduces the false alarm rate by using dual current transformers. Simultaneously, the gradient distribution design of the arc guide plate forcibly stretches the arc length, and combined with the heat dissipation area of ​​the metal sheet, effectively shortens the arc extinguishing time. It also facilitates the replacement of the arc guide plate, and the grooves and fixing screws make connecting external terminals more convenient.

Description

Technical Field

[0001] This utility model relates to the field of relay technology, specifically an arc fault protection relay. Background Technology

[0002] A relay is an electrical control device that causes a predetermined step change in the controlled quantity in the electrical output circuit when the change in the input quantity reaches a specified requirement. It has an interactive relationship between the control system and the controlled system and is usually used in automated control circuits, where it plays a role in automatic adjustment, safety protection and switching circuits.

[0003] In existing technologies, relays typically only have a single current transformer, which makes it impossible to distinguish between fault arcs, such as intermittent discharges caused by line aging, and normal surge currents. They cannot avoid false tripping caused by normal surges such as motor starting. They also lack high-frequency harmonic analysis capabilities, which can easily lead to false alarms. Furthermore, arc extinguishing structures often rely on sealed compartments, resulting in low heat dissipation efficiency and significant response delays. Utility Model Content

[0004] The purpose of this invention is to provide an arc fault protection relay to solve the problems mentioned in the background art.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] An arc fault protection relay includes a housing 1, a back plate connected to the back of the housing 1 by screws, a housing 2 fixedly installed on the outer wall of the housing 1, a movable opening through the outer wall of the housing 2, a handle movably installed inside the movable opening, and a metal sheet fixedly installed inside the housing 1 and on one side of the circuit board.

[0007] A circuit board is fixedly installed inside the outer casing, and an interface is fixedly installed on the outer wall of the circuit board. A current transformer I and a current transformer II are installed inside the outer casing near the bottom. Cables are installed inside both current transformer I and current transformer II.

[0008] Preferably, a mounting frame is fixedly installed inside the outer casing near the upper end, and a plurality of arc guide plates are fixedly installed inside the mounting frame.

[0009] Preferably, the guide arc plates are evenly distributed, and the two outer side walls of the mounting frame are provided with a number of fixing blocks.

[0010] Preferably, each of the fixing blocks has an insertion port, and one end of the insertion port is fixedly connected to the arc guide plate.

[0011] Preferably, a triggering mechanism is provided inside the outer casing near the center, and an iron core is fixedly installed inside the outer casing below the triggering mechanism.

[0012] Preferably, the iron core and the triggering mechanism cooperate with each other, and a coil is wound around the outside of the iron core.

[0013] Preferably, two grooves are formed on the outer wall of the outer casing near the upper and lower ends, and fixing screws are provided on the inner walls of the two grooves.

[0014] The beneficial effects of this utility model are:

[0015] In this invention, by setting up dual current transformers, arc faults can be detected in a coordinated manner, reducing the false alarm rate. At the same time, it avoids malfunctions caused by normal surges such as motor startup. Meanwhile, the gradient distribution design of the arc guide plate forces the arc length to be stretched, and in conjunction with the heat dissipation area of ​​the metal plate, it effectively shortens the arc extinguishing time.

[0016] In this utility model, grooves and fixing screws are provided at both the upper and lower ends of the arc fault protection relay. The fixing screws embedded in the grooves support dual installation modes of guide rail or panel, are compatible with standard power distribution cabinets, and are more convenient to connect external wiring terminals. Furthermore, the modular connection between the socket and the fixing block allows for tool-free replacement of the arc guide plate, reducing maintenance costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the outer shell and the back plate in this utility model;

[0020] Figure 3 This is a partial structural schematic diagram of the present invention;

[0021] Figure 4 This is a schematic diagram of the circuit board and coil structure in this utility model;

[0022] Figure 5 This is a schematic diagram of the mounting frame and triggering mechanism in this utility model;

[0023] Figure 6 This is a cross-sectional view of the mounting frame in this utility model.

[0024] The attached figures are labeled as follows:

[0025] 1. Outer shell one; 2. Back plate; 3. Circuit board; 4. Handle; 5. Outer shell two; 6. Coil; 7. Current transformer one; 8. Mounting frame; 9. Arc guide plate; 10. Fixing screw; 11. Current transformer two; 12. Metal sheet; 13. Fixing block; 14. Socket; 15. Interface; 16. Groove; 17. Movable port; 18. Triggering mechanism; 19. Iron core; 20. Cable. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] An arc fault protection relay, such as Figures 1-6 As shown, it includes a housing 1, a back plate 2 connected to the back of the housing 1 by screws, a housing 2 5 fixedly installed on the outer wall of the housing 1, a movable opening 17 through the outer wall of the housing 2 5, a handle 4 movably installed inside the movable opening 17, a metal plate 12 fixedly installed inside the housing 1 and located on one side of the circuit board 3, a circuit board 3 fixedly installed inside the housing 1, an interface 15 fixedly installed on the outer wall of the circuit board 3, and a current transformer 7 and a current transformer 11 installed inside the housing 1 near the bottom, with cables 20 installed inside both the current transformer 7 and the current transformer 11.

[0028] Among them, current transformer 7 and current transformer 11 are installed in parallel at the bottom of housing 1. The internal cable 20 passes through the center of the magnetic ring to collect the fundamental current and high-frequency harmonics in the circuit. The output terminals of current transformer 7 and current transformer 11 are both soldered to circuit board 3. The circuit board 3 analyzes the current characteristics to determine whether it is a real arc fault.

[0029] An installation frame 8 is fixedly installed inside the outer casing 1 near the upper end. Several arc guide plates 9 are fixedly installed inside the installation frame 8. The arc guide plates 9 are evenly distributed. Several fixing blocks 13 are opened through both outer side walls of the installation frame 8. Each fixing block 13 has a socket 14 inserted inside it. One end of the socket 14 is fixedly connected to the arc guide plate 9. The arc guide plate 9 is modularly connected to the fixing block 13 through the socket 14 and is installed in the installation frame 8. This allows for tool-free replacement of the arc guide plate 9, which can effectively reduce maintenance costs.

[0030] A trigger mechanism 18 is located near the center inside the outer casing 1. An iron core 19 is fixedly installed inside the outer casing 1 and below the trigger mechanism 18. The iron core 19 and the trigger mechanism 18 cooperate with each other. A coil 6 is wound around the outside of the iron core 19. The circuit board 3 sends a signal to energize the coil 6, magnetize the iron core 19 and drive the trigger mechanism 18. This allows the handle 4 to quickly disconnect the circuit through the movable port 17. The electric arc generated at the moment of disconnection is captured by the arc guide plates 9 evenly distributed in the mounting frame 8. With the help of the socket 14, the fixing block 13 and the multi-stage current distribution structure formed by multiple arc guide plates 9, the energy is finally directed to the metal plate 12 for dissipation.

[0031] In use, cable 20 passes through current transformer 1 7 and current transformer 2 11 to collect current signals in real time. Circuit board 3 compares the characteristics of the two signals. If the fundamental wave exceeds the limit and the high-frequency harmonics continue, it is determined to be an arc fault. Circuit board 3 transmits the signal to coil 6, which energizes coil 6 and magnetizes the Shudie iron core 19, which can drive the trigger mechanism 18 to move the handle 4 and perform the breaking operation. At the same time, the arc generated during the breaking is divided and cooled by the arc guide plate 9, and finally the energy is released through the metal plate 12 to complete the entire breaking operation.

[0032] The outer wall of the casing has two grooves 16 near the top and bottom ends. Each groove 16 has a fixing screw 10 embedded in its inner wall. The fixing screw 10 supports both rail and panel mounting modes, making it compatible with standard distribution cabinets. External wiring terminals can be connected and fixed to the arc fault protection relay using the fixing screw 10. The presence of grooves 16 and fixing screws 10 on both the top and bottom of the arc fault protection relay facilitates multi-part connection and installation of external wiring terminals. The fixing screw 10 embedded in the grooves supports both rail and panel mounting modes, making it compatible with standard distribution cabinets and enabling the arc fault protection relay to connect and cooperate with external circuits.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. An arc fault protection relay, comprising a housing (1), characterized in that, The back of the outer shell (1) is connected to a back plate (2) by screws. The outer wall of the outer shell (1) is fixedly installed with a second outer shell (5). The outer wall of the second outer shell (5) is provided with a movable opening (17). A handle (4) is movably installed inside the movable opening (17). A metal sheet (12) is fixedly installed inside the outer shell (1) and located on one side of the circuit board (3). A circuit board (3) is fixedly installed inside the outer casing (1). An interface (15) is fixedly installed on the outer side wall of the circuit board (3). A current transformer (7) and a current transformer (11) are installed inside the outer casing (1) near the bottom. Cables (20) are provided inside both the current transformer (7) and the current transformer (11).

2. The arc fault protection relay according to claim 1, characterized in that, An installation frame (8) is fixedly installed inside the outer shell (1) near the upper end, and several arc guide plates (9) are fixedly installed inside the installation frame (8).

3. The arc fault protection relay according to claim 2, characterized in that, Several of the aforementioned arc guide plates (9) are evenly distributed, and several fixing blocks (13) are provided through both outer side walls of the mounting frame (8).

4. The arc fault protection relay according to claim 3, characterized in that, Each of the fixed blocks (13) has an insertion port (14) inserted inside, and one end of the insertion port (14) is fixedly connected to the arc guide plate (9).

5. An arc fault protection relay according to any one of claims 1 to 4, characterized in that, A triggering mechanism (18) is provided inside the outer casing (1) near the center, and an iron core (19) is fixedly installed inside the outer casing (1) and below the triggering mechanism (18).

6. The arc fault protection relay according to claim 5, characterized in that, The iron core (19) cooperates with the triggering mechanism (18), and a coil (6) is wound around the outside of the iron core (19).

7. The arc fault protection relay according to claim 6, characterized in that, Two grooves (16) are provided on the outer wall of the outer shell (1) near the upper and lower ends, and fixing screws (10) are provided on the inner wall of the two grooves (16).

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