A preset protection device for preventing a load operating frame circuit breaker

Abstract

The utility model relates to a kind of preset protection device for preventing load operation frame circuit breaker, belong to circuit breaker equipment field.The structure includes current transformer (8) and tripping catch mechanism (1), further include current intermediate relay (6) and bayonet (9), the current transformer (8) is electrically connected with current intermediate relay (6), the bayonet (9) is slidably arranged on current intermediate relay (6), and current intermediate relay (6) is powered or power-off control bayonet (9) extends or retracts, bayonet (9) can control tripping catch mechanism (1) rotation.The structure is fixed tripping catch mechanism (1) by current intermediate relay (6) control bayonet (9) extension, avoid tripping catch mechanism (1) rotation and main contact tripping device (4) separation cause equipment power-off.Solved the existing load stop circuit breaker, cause equipment abnormal outage, cause greater loss to production problem.

Description

Technical Field

[0001] This utility model relates to a preset protection device for preventing the operation of frame circuit breakers under load, belonging to the field of circuit breaker equipment. Background Technology

[0002] A frame-type circuit breaker, also known as a universal circuit breaker, is a mechanical switching device capable of connecting, carrying, and breaking normal or abnormal circuit currents (such as short circuits and overloads). Its core feature is that all components are installed within a metal or insulated frame, providing high breaking capacity and modular design. It is widely used in the main switches or high-current circuit protection of low-voltage power distribution systems. Employing an open metal frame structure, it facilitates the installation of various accessories and maintenance. It provides multi-stage protection (long-delay, short-delay, instantaneous, and ground fault), with adjustable settings and support for selective protection. Primarily used for incoming lines in power distribution systems, busbar connections, large-capacity feeders, and the control of large motors, frame-type circuit breakers offer overload protection, short-circuit protection, overvoltage protection, undervoltage protection, ground fault protection, instantaneous protection, long-delay protection, short-delay protection, and anti-pumping function. These protective functions work together to ensure the safety of electrical equipment and personnel, effectively preventing various electrical faults.

[0003] However, in normal operation, there may be events where the circuit breaker stops under load. If this happens, it may cause equipment downtime and significant production losses. Therefore, it is necessary to improve the protection device system of the frame circuit breaker to form a protection device specifically designed to prevent power outages under load, so as to ensure the safety of power supply operation. Utility Model Content

[0004] The technical problem to be solved by this utility model is that existing circuit breakers with load-bearing operation cause abnormal equipment shutdowns, resulting in significant production losses.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a preset protection device for preventing the operation of a frame circuit breaker under load, including a current transformer and a tripping mechanism, and also including a current intermediate relay and a locking pin. The current transformer is electrically connected to the current intermediate relay, and the locking pin is slidably disposed on the current intermediate relay. When the current intermediate relay is energized or de-energized, it controls the extension or retraction of the locking pin. The locking pin can control the rotation of the tripping mechanism.

[0006] The release hook mechanism in the above device is a T-shaped structure, and the locking pin can control the vertical side of the release hook mechanism to move upward.

[0007] Furthermore, the vertical side of the release hook mechanism in the above device is an inverted T-shaped structure, and the locking pin is set perpendicular to the vertical side. The locking pin can control the upward movement of the large end of the vertical side of the release hook mechanism.

[0008] Furthermore, the device also includes a stop button, which has an inverted T-shaped structure, with its small end perpendicular to the large end of the vertical side of the release hook mechanism 1, and the current intermediate relay can drive the locking pin to move toward the vertical side wall of the stop button when energized.

[0009] Furthermore, the aforementioned device also includes a shunt trip unit and a trip coil. The shunt trip unit is hinged in the middle, with one end located below the large vertical end of the trip mechanism and the other end located above the trip coil. An intermediate current relay can control the trip coil to be de-energized.

[0010] Furthermore, in the above-mentioned device, the normally closed contact of the intermediate current relay is connected in series with the trip coil.

[0011] The beneficial effects of this utility model are: the device has a simple structure, reasonable design, and is easy to use. This device is electrically connected to a current intermediate relay via a current transformer, allowing the current intermediate relay to continuously detect the current signal on the main circuit. This, in turn, controls the extension of a locking pin to secure the tripping mechanism, preventing it from rotating and disengaging from the main contact tripping device, thus avoiding a power outage in the main circuit. This device offers advantages such as good performance, high efficiency, simple operation, and low cost. Using this device results in low investment and stable equipment operation, ensuring both the safe operation of the distribution cabinet and smooth production. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 This is a schematic diagram of the control principle of the trip coil of this utility model.

[0014] The markings in the diagram are as follows: 1 is the trip mechanism, 2 is the shunt trip unit, 3 is the stop button, 4 is the main contact trip unit, 5 is the trip coil, 6 is the intermediate current relay, 7 is the normally closed contact, 8 is the current transformer, 9 is the locking pin, 10 is the protection trip, and 11 is the local start button. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] like Figure 1 and Figure 2As shown, this utility model discloses a pre-set protection device for preventing the operation of a frame circuit breaker under load. It includes a current transformer 8 and a tripping mechanism 1, as well as a current intermediate relay 6 and a locking pin 9. The current transformer 8 is electrically connected to the current intermediate relay 6. The locking pin 9 is slidably mounted on the current intermediate relay 6, and the current intermediate relay 6 extends or retracts when energized or de-energized. The locking pin 9 can control the rotation of the tripping mechanism 1. Those skilled in the art will understand that this device, through the electrical connection between the current transformer 8 and the current intermediate relay 6 (i.e., the secondary wire of the current transformer 8 is connected to the coil of the current intermediate relay 6), allows the current intermediate relay 6 to continuously detect the current signal on the main circuit. By controlling the extension of the locking pin 9, it prevents the tripping mechanism 1 from rotating and disengaging from the main contact trip unit 4, thus preventing power outage of the main circuit. In other words, through the arrangement of the current intermediate relay 6 and the locking pin 9, as long as the current transformer detects a current signal, the tripping mechanism 1 cannot rotate and separate from the main contact trip unit 4 to achieve power outage under load. The current transformer 8 is electrically connected to the intermediate current relay 6. When the current transformer detects and transmits a current signal, the intermediate current relay 6 is energized, causing the locking pin 9 to extend. Similarly, when the current transformer does not detect a current signal, the intermediate current relay 6 de-energizes the circuit, causing the locking pin 9 to retract. The tripping mechanism 1 is hinged at one end to the fixed 5, and the other end can be latched onto the main contact trip unit 4 to connect the main circuit. When the locking pin 9 extends, it controls the rotation of the tripping mechanism 1, ensuring that the tripping mechanism 1 is latched onto the main contact trip unit 4. Conversely, when the locking pin 9 retracts, the tripping mechanism 1 can operate independently, separating from the main contact trip unit 4 to de-energize the circuit.

[0017] Preferably, the release hook mechanism 1 in the above-mentioned device has a T-shaped structure, and the locking pin 9 can control the vertical side of the release hook mechanism 1 to move upward. Those skilled in the art will understand that, in order to facilitate the locking pin 9 in controlling the rotation of the release hook mechanism 1, this structure preferably uses a T-shaped release hook mechanism 1, so that the locking pin 9 can control the rotation of the release hook mechanism 1 by controlling the vertical side of the release hook mechanism 1 to move upward.

[0018] Preferably, the vertical side of the release hook mechanism 1 in the above-mentioned device is an inverted T-shaped structure, and the locking pin 9 is arranged perpendicular to the vertical side. The locking pin 9 can control the upward movement of the larger end of the vertical side of the release hook mechanism 1. Those skilled in the art will understand that this structure further limits the vertical side structure of the release hook mechanism 1 to an inverted T-shaped structure. This structure allows the locking pin 9 to control the rotation of the release hook mechanism 1 simply by controlling the upward movement of the larger end of the vertical side. Furthermore, this vertical side arrangement facilitates subsequent contact and connection with the stop button 3 and the shunt trip unit 2.

[0019] Preferably, the above-mentioned device also includes a stop button 3, which has an inverted T-shaped structure, with its small end perpendicular to the large end of the vertical side of the release mechanism 1. When the intermediate current relay 6 is energized, it can drive the locking pin 9 to move towards the vertical side wall of the stop button 3. Those skilled in the art will understand that, for convenient manual power-off operation, a stop button 3 is actually provided. In this case, the locking pin 9 only needs to control the action of the stop button 3 to control the rotation of the release mechanism 1. Since the stop button 3 has an inverted T-shaped structure, with its small end perpendicular to the large end of the vertical side of the release mechanism 1, pressing the stop button 3 can push the large end of the vertical side of the release mechanism 1 upwards, thereby achieving the rotation of the release mechanism 1 and separation from the main contact trip unit 4 to achieve power-off under load. Therefore, in this case, the structure only needs to control the action of the stop button 3. Therefore, in this preferred structure, the intermediate current relay 6 can be energized to drive the locking pin 9 to move towards the vertical side wall of the stop button 3. In practice, the locking pin 9 can be positioned against the vertical side of the stop button 3 and perpendicular to the vertical side of the stop button 3. As long as the intermediate relay 6 is energized, it can drive the locking pin 9 to move towards the vertical side wall of the stop button 3. Since the upper surface of the large end of the stop button 3 is in direct contact with the outer wall of the locking pin 9, it cannot move upward, thus locking the stop button 3 and preventing it from operating.

[0020] Preferably, the above-mentioned device further includes a shunt trip unit 2 and a trip coil 5. The shunt trip unit 2 is hinged in the middle, with one end located below the large vertical end of the trip mechanism 1, and the other end located above the trip coil 5. An intermediate current relay 6 can control the trip coil 5 to be de-energized. Those skilled in the art will understand that, for ease of automatic control, a shunt trip unit 2 and a trip coil 5 are actually provided. The shunt trip unit 2 is hinged in the middle, with one end located below the large vertical end of the trip mechanism 1, and the other end located above the trip coil 5. This structural arrangement allows the trip coil 5 to be energized, which can attract the shunt trip unit 2 downwards. The end of the shunt trip unit 2 located below the large vertical end of the trip mechanism 1 moves upwards, thereby driving the trip mechanism 1 to rotate and separate from the main contact trip unit 4, achieving load de-energization. Therefore, in this preferred structure, the intermediate current relay 6 can control the trip coil 5 to be de-energized; in practice, the intermediate current relay 6 energizes the trip coil 5.

[0021] Preferably, the normally closed contact 7 of the intermediate current relay 6 in the above-described device is connected in series with the trip coil 5. Those skilled in the art will understand that, for ease of automatic control, this device preferably connects the normally closed contact 7 of the intermediate current relay 6 with the trip coil 5 in series. This configuration ensures that once the intermediate current relay 6 is energized, the normally closed contact 7 opens, thereby de-energizing the trip coil 5 connected in series with it and preventing the shunt trip unit 2 from actuating. To ensure the safe operation of the trip coil 5, in practice, the protection trip and local start buttons are connected in the control circuit before being connected in series with the normally closed contact 7 and the trip coil 5.

[0022] Working principle of this device When the frame circuit breaker is under load, the current transformer 8 detects the load current in the main circuit of the frame circuit breaker and outputs a timely current signal through the secondary line, which is transmitted to the coil of the intermediate current relay 6. The intermediate current relay 6 receives the current signal detected and transmitted by the current transformer, and its normally closed contact 7 is opened, so that the trip coil 5 cannot be energized and operated. At the same time, when the current signal detected and transmitted by the current transformer is energized through the coil of the intermediate current relay 6, the locking pin 9 is activated, blocking the stop button 3 and preventing the stop button 3 from operating.

[0023] Because the trip coil 5 cannot be energized and the stop button 3 cannot be activated, the shunt trip unit 2 cannot be activated; the trip hook mechanism 1 cannot be activated; and finally, the main contact trip device 4 cannot be activated. Therefore, the frame circuit breaker cannot be stopped when there is current, thus playing a role in protecting and preventing the circuit breaker from being stopped under load.

[0024] When the circuit breaker is unloaded, the current transformer 8 detects that the load on the main circuit of the circuit breaker is zero. The current transmitted to the intermediate current relay 6 is zero. Since the current signal detected by the current transformer 8 is zero, the current through the coil of the intermediate current relay 6 is zero, causing its normally closed contact 7 to close, thus energizing the trip coil 5. Simultaneously, when the current signal detected by the current transformer 8 is zero, the coil of the intermediate current relay 6 is de-energized, preventing the latch 9 from operating and allowing the stop button 3 to operate. Therefore, the circuit breaker can disconnect the stop button 3 when there is no current.

Claims

1. A pre-set protection device for preventing the operation of a frame circuit breaker under load, comprising a current transformer (8) and a tripping mechanism (1), characterized in that: It also includes a current intermediate relay (6) and a locking pin (9). The current transformer (8) is electrically connected to the current intermediate relay (6). The locking pin (9) is slidably disposed on the current intermediate relay (6). When the current intermediate relay (6) is energized or de-energized, the locking pin (9) extends or retracts. The locking pin (9) can control the rotation of the hook-and-loop mechanism (1).

2. A pre-set protection device for preventing the operation of a frame circuit breaker under load, as described in claim 1, characterized in that: The release hook-and-hook mechanism (1) is a T-shaped structure, and the locking pin (9) can control the vertical side of the release hook-and-hook mechanism (1) to move upward.

3. A pre-set protection device for preventing the operation of a frame circuit breaker under load, as described in claim 2, characterized in that: The vertical side of the release hook-and-hook mechanism (1) is an inverted T-shaped structure, and the locking pin (9) is set perpendicular to the vertical side. The locking pin (9) can control the large end of the vertical side of the release hook-and-hook mechanism (1) to move upward.

4. A preset protection device for preventing the operation of a frame circuit breaker under load, as described in claim 3, characterized in that: It also includes a stop button (3), which is an inverted T-shaped structure, with its small end perpendicular to the large end of the vertical side of the release hook mechanism (1), and the current intermediate relay (6) can drive the locking pin (9) to move toward the vertical side wall of the stop button (3) when energized.

5. A preset protection device for preventing the operation of a frame circuit breaker under load, as described in claim 4, characterized in that: It also includes a shunt trip unit (2) and a trip coil (5). The shunt trip unit (2) is hinged in the middle and one end is located below the large end of the vertical side of the trip hook mechanism (1), while the other end is located above the trip coil (5). The intermediate current relay (6) can control the trip coil (5) to be de-energized.

6. A pre-set protection device for preventing the operation of a frame circuit breaker under load, as described in claim 5, characterized in that: The normally closed contact (7) of the intermediate current relay (6) is connected in series with the trip coil (5).

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