Residual current operated circuit breaker

Abstract

The utility model discloses a residual current operated circuit breaker, which comprises a bottom shell, a middle frame arranged at the top of the bottom shell, and a top cover arranged at the top of the middle frame, a plurality of static contacts are arranged in the bottom shell, a plurality of wiring terminals are arranged on the bottom shell, a zero sequence mutual inductor is arranged in the bottom shell, and the zero sequence mutual inductor is of a runway-shaped structure. A plurality of wiring terminals are arranged in the middle frame, combined mutual inductors are arranged on the outer sides of the plurality of wiring terminals, one ends of the plurality of wiring terminals penetrate through the zero sequence mutual inductor to be connected with the static contact, a circuit board is arranged in the middle frame, and an electric leakage switching button is arranged on the circuit board. According to the residual current operated circuit breaker, the electric gaps among the multiple wiring terminals are enlarged, normal operation of the residual current operated circuit breaker can be ensured, breakdown caused by too small gaps can be prevented, reliability is improved, meanwhile, the one-key electric leakage switching function can be achieved through the arranged electric leakage switching button, and operation is easier and more convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit breaker technical field, concretely is a kind of residual current operated circuit breaker. BACKGROUND

[0002] Residual current operated circuit breaker is a kind of device that can detect residual current in circuit, when current leakage is caused by equipment insulation damage, personal electric shock or line aging in line, it can quickly cut off power supply, prevent electric shock accident and electrical fire, zero sequence transformer is the core component in residual current operated circuit breaker, for detecting zero sequence current.

[0003] The zero sequence transformer of existing residual current operated circuit breaker is generally circular, such as the Chinese patent with application number 202122671171.5 discloses a residual current operated circuit breaker, the utility model adopts circular transformer, so that the electrical gap between multiple through-core connecting pieces is small, not only possibly influence the detection accuracy of zero sequence transformer, make circuit breaker unable to accurately identify abnormal residual current in line, lead to protection action delay or failure, but also possibly appear breakdown condition, make circuit breaker damage, and reliability is poor. SUMMARY

[0004] The utility model aims at providing a kind of residual current operated circuit breaker to solve the problems raised in the above background.

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of residual current operated circuit breaker, including bottom shell, middle frame being installed at the top of bottom shell and top cover being installed at the top of middle frame, the inside of bottom shell is equipped with multiple static contacts, the bottom shell is equipped with multiple terminal blocks, the inside of bottom shell is installed with zero sequence transformer, the zero sequence transformer is runway shape structure, the outside of multiple terminal blocks is all installed with combined transformer, multiple combined transformers are located at the outside of terminal block respectively, one end of multiple terminal blocks is connected with static contact by passing through zero sequence transformer, the inside of middle frame is installed with circuit board, the circuit board is equipped with leakage on-off button, and the bottom shell and middle frame are equipped with tripping mechanism.

[0006] As a preferred scheme of the utility model, the inside of bottom shell is installed with operating mechanism, and the bottom shell is equipped with moving contact.

[0007] As a preferred scheme of the utility model, the inside of bottom shell is installed with arc-extinguishing chamber.

[0008] As a preferred scheme of the utility model, the front and rear sides of bottom shell are both installed with arc separation plate.

[0009] Compared with the prior art, the utility model discloses the beneficial effects are: the utility model discloses the zero sequence mutual inductor is set to the race track shape structure, make the electrical gap between multiple wiring terminals become big, not only can avoid the influence zero sequence mutual inductor's detection accuracy, ensure the normal operation of residual current operating circuit breaker, and can prevent the breakdown from the gap too small, improve reliability, and through the voltage transformer and current transformer combination together use, can reduce the space occupied, improve space utilization, thereby reduce the volume of residual current operating circuit breaker, simultaneously through the leakage of setting the button can realize one -key leakage and off function, operation is more simple and convenient. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is the three -dimensional structure schematic diagram of the utility model;

[0011] Figure 2 It is the structure schematic diagram of the bottom shell of the utility model;

[0012] Figure 3 It is the structure schematic diagram of wiring terminal, combined mutual inductor and zero sequence mutual inductor of the utility model;

[0013] Figure 4 It is the structure schematic diagram of the utility model after removing top cover;

[0014] Figure 5 It is the structure schematic diagram of zero sequence mutual inductor of the utility model.

[0015] In the drawing: 1, bottom shell;2, middle frame;3, top cover;4, leakage button;5, arc separation plate;6, wiring terminal;7, combined mutual inductor;8, zero sequence mutual inductor;9, static contact;10, dynamic contact;11, operating mechanism;12, tripping mechanism;13, circuit board;14, arc chamber. DETAILED DESCRIPTION

[0016] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor fall within the scope of the utility model.

[0017] Please refer to Figures 1 to 5The utility model provides a technical scheme: a residual current operating circuit breaker, including bottom shell 1, install in the middle frame 2 of bottom shell 1 top and install in the top cover 3 of middle frame 2 top, the inside of bottom shell 1 is equipped with a plurality of static contacts 9, and bottom shell 1 is equipped with a plurality of terminal 6, and the inside of bottom shell 1 is installed with zero sequence mutual inductor 8, and zero sequence mutual inductor 8 is the track shape structure, makes the electrical gap between a plurality of terminal 6 become big, avoids the breakdown due to the too small gap, leads to equipment damage, improves reliability, and the outside of a plurality of terminal 6 is installed with combined mutual inductor 7, and the inside of combined mutual inductor 7 is equipped with voltage transformer and current transformer respectively, plays the metering protection function, by using voltage transformer and current transformer together, can reduce the space occupied, improves space utilization, thereby reduces the volume of residual current operating circuit breaker, and one end of a plurality of terminal 6 passes through zero sequence mutual inductor 8 and is connected with static contact 9, and the inside of middle frame 2 is installed with circuit board 13, and circuit board 13 is equipped with leakage throw-in and throw-off button 4, and bottom shell 1 and middle frame 2 are equipped with tripping mechanism 12, and tripping mechanism 12 is equipped with electronic tripping device, and electronic tripping device and leakage throw-in and throw-off button 4 are all connected with circuit board 13 wire, when pressing leakage throw-in and throw-off button 4, will produce electric signal and send electronic tripping device through circuit board 13, and electronic tripping device accepts signal and acts.

[0018] Wherein, the inside of bottom shell 1 is installed with operating mechanism 11, and bottom shell 1 is equipped with movable contact 10, and operating mechanism 11 is transmission connection with movable contact 10, and operating mechanism 11 can make movable contact 10 act, and operating mechanism 11 and movable contact 10 are prior art, so not in detail.

[0019] Wherein, the inside of bottom shell 1 is installed with arc extinguishing chamber 14, and arc extinguishing chamber 14 is used to make arc extinguish quickly, to avoid arc sustained ignition fire or equipment damage.

[0020] Wherein, the front and rear sides of bottom shell 1 are both installed with arc separation plate 5, and arc separation plate 5 is used to prevent arc diffusion to external environment and cause secondary failure or fire, to avoid arc spatter to cause harm to operator.

[0021] Specifically, when using, by pressing leakage throw-in and throw-off button 4, electric signal is generated and sent to electronic tripping device through circuit board 13, and electronic tripping device acts after receiving signal, realizing one-key leakage throw-in and throw-off function, and operation is more convenient, and track-shaped zero sequence mutual inductor 8 is set, making the electrical gap between a plurality of terminal 6 become big, avoiding breakdown due to too small gap, and improving reliability.

[0022] In the description of the utility model, need understanding is, the term "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "central", "both ends" and so on indicate the orientation or positional relationship is based on the orientation or positional relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply the device or element indicated must have a particular orientation, with a particular orientation structure and operation, therefore cannot be understood as a restriction on the utility model.

[0023] In addition, the terms "first", "second", "third", "fourth" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features, therefore, the features limited by "first", "second", "third", "fourth" can be explicitly or implicitly include at least one of the features.

[0024] In the utility model, unless otherwise expressly provided and limited, the terms "installation", "arrangement", "connection", "fixing", "screw connection" and so on should be understood broadly, for example, can be fixedly connected, can also be detachably connected, or integrated, can be mechanically connected, can also be electrically connected, can be directly connected, can also be indirectly connected through intermediate medium, can be the communication or interaction relationship between two elements, unless otherwise expressly limited, for ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0025] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and its equivalents.

Claims

1. A residual current circuit breaker comprising a bottom shell (1), a middle frame (2) mounted on the top of the bottom shell (1), and a top cover (3) mounted on the top of the middle frame (2), the inside of the bottom shell (1) being provided with a plurality of static contacts (9), characterized in that: A plurality of wiring terminals (6) are arranged on the bottom shell (1), a zero sequence transformer (8) is arranged in the bottom shell (1), the zero sequence transformer (8) is in a runway shape, a combined transformer (7) is arranged on the outer side of each of the plurality of wiring terminals (6), one end of each of the plurality of wiring terminals (6) is connected with a static contact (9) through the zero sequence transformer (8), a circuit board (13) is arranged in the middle frame (2), an electric leakage on-off button (4) is arranged on the circuit board (13), and a tripping mechanism (12) is arranged between the bottom shell (1) and the middle frame (2).

2. A residual current operated circuit breaker according to claim 1, characterized in that: An operating mechanism (11) is arranged in the bottom shell (1), and a moving contact (10) is arranged on the bottom shell (1).

3. The residual current circuit breaker according to claim 1, characterized in that: An arc extinguishing chamber (14) is arranged in the bottom shell (1).

4. The residual current circuit breaker according to claim 1, characterized in that: Arc isolation plates (5) are arranged on the front and back sides of the bottom shell (1).

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