A circuit switching device for an ac distribution box

Abstract

The application discloses a circuit switching device of an alternating current distribution box, relates to the technical field of circuit switching of alternating current distribution boxes, and comprises a manual control module, an electric control module and an execution element, wherein the manual control module and the electric control module are connected with the execution element, and the manual control module and the electric control module can control the execution element to act, respectively, and the execution element is used for locking a main circuit breaker, locking a standby circuit breaker or locking the main circuit breaker and the standby circuit breaker simultaneously when acting. The application can adapt to complex and changeable power consumption scene requirements, realizes reliable management and control of main and standby circuit breakers in the alternating current distribution box, and fully guarantees the safe and stable operation of a power supply system.

Description

Technical Field

[0001] This invention relates to the field of circuit switching technology for AC distribution boxes, and in particular to a circuit switching device for AC distribution boxes. Background Technology

[0002] Circuit breakers are commonly used protective devices in power systems, used to interrupt current in circuits to prevent electrical accidents. The circuit breaker interlocking principle is a special circuit breaker protection mechanism that uses an interlocking device (i.e., a circuit switching device) to achieve interlocking control of the circuit breaker. Its functions are as follows: (1) Preventing short circuit accidents: The interlocking principle of circuit breakers can effectively prevent multiple circuit breakers from closing at the same time, thereby preventing short circuit accidents in the power system. If multiple circuit breakers close at the same time in the power system, the current will increase abnormally, which may cause dangerous situations such as electric arcs and sparks, and even cause equipment damage and personal injury. By setting up the interlocking device, the circuit breakers form a relationship of mutual restraint and mutual restriction, which can ensure that only one circuit breaker is in the closed state, effectively preventing the occurrence of short circuit accidents. (2) Improve the reliability of the power system: The application of the circuit breaker interlocking principle can improve the reliability of the power system. In the operation of the power system, if a circuit breaker fails and needs to be repaired or replaced, the interlocking device can cut off the current of the circuit breaker interlocked with it in time, so as to avoid affecting the normal operation of the power system. At the same time, the interlocking device can also monitor and control the operation of the circuit breaker to ensure that the operation of the circuit breaker complies with the prescribed sequence and requirements, thereby improving the stability and reliability of the power system.

[0003] However, traditional main and backup circuit breaker control schemes often employ a single fault triggering logic, only capable of basic undervoltage tripping or fault switching functions, lacking comprehensive monitoring and refined linkage control of the voltage status of both the main and backup circuits. Specifically, when voltage is present at the input terminals of both the main and backup circuit breakers, existing control schemes cannot actively trip and lock the backup circuit breaker, making it highly susceptible to accidental closing of the backup circuit breaker, leading to parallel connection of the two power supplies, causing current surges, equipment damage, and even electrical fires. When there is no voltage in either the main or backup circuit, traditional control devices struggle to synchronously output trip commands to the main and backup circuit breakers and apply closing lockouts, potentially causing the circuit breaker to close with a fault during system power restoration, further expanding the scope of the fault's impact. Furthermore, for critical operating conditions where one of the main and backup circuits is energized and the other de-energized, existing schemes often only trigger the tripping action of the de-energized circuit breaker without a corresponding closing lockout mechanism. During system voltage fluctuations or instantaneous recovery, the de-energized circuit breaker is prone to accidental closing, disrupting the operational stability of the power supply system.

[0004] In addition, the existing main and backup circuit breaker control logic has a low level of intelligence and cannot automatically match the corresponding control strategy according to the real-time voltage status of the main and backup circuits. It requires complete manual intervention to complete fault diagnosis and reset operations, which not only increases the operation and maintenance costs, but also reduces the emergency response efficiency of the power supply system. Summary of the Invention

[0005] The purpose of this invention is to provide a circuit switching device for an AC distribution box to solve the problems existing in the prior art, adapt to the needs of complex and ever-changing power consumption scenarios, realize reliable control of the main and backup circuit breakers in the AC distribution box, and fully ensure the safe and stable operation of the power supply system.

[0006] To achieve the above objectives, the present invention provides the following solution: This invention provides a circuit switching device for an AC distribution box, comprising a manual control module, an electric control module, and an actuator. Both the manual control module and the electric control module are connected to the actuator, and the manual control module and the electric control module can respectively control the operation of the actuator. When the actuator is activated, it is used to lock the main circuit breaker, or lock the backup circuit breaker, or lock both the main circuit breaker and the backup circuit breaker simultaneously.

[0007] Preferably, the system further includes a controller and an auxiliary power supply, the auxiliary power supply being electrically connected to the controller and used to provide electrical energy, the manual control module and the electric control module being electrically connected to the controller, and the controller being connected to the actuator and used to drive the actuator to move.

[0008] Preferably, the manual control module includes two manual buttons, namely a main circuit button and a backup circuit button. Both the main circuit button and the backup circuit button are electrically connected to the controller. When the main circuit button is pressed, the controller controls the actuator to lock the main circuit breaker. When the backup circuit button is pressed, the controller controls the actuator to lock the backup circuit breaker. When both the main circuit button and the backup circuit button are pressed, the controller controls the actuator to lock both the main circuit breaker and the backup circuit breaker.

[0009] Preferably, the electric control module includes a main circuit voltage detection element and a backup circuit voltage detection element. Both the main circuit voltage detection element and the backup circuit voltage detection element are electrically connected to the controller. The main circuit voltage detection element is used to collect the input voltage of the main circuit breaker, and the backup circuit voltage detection element is used to collect the input voltage of the backup circuit breaker. The controller can control the actuator to operate based on the voltage signals detected by the main circuit voltage detection element and the backup circuit voltage detection element.

[0010] Preferably, when the main circuit voltage detection element detects a voltage signal at the input terminal of the main circuit breaker and the backup circuit voltage detection element detects a voltage signal at the input terminal of the backup circuit breaker, the controller controls the actuator to operate and locks the backup circuit breaker. When the main circuit voltage detection element detects no voltage signal at the input terminal of the main circuit breaker and the backup circuit voltage detection element detects no voltage signal at the input terminal of the backup circuit breaker, the controller controls the actuator to operate and causes the actuator to lock the main circuit breaker and the backup circuit breaker. When the main circuit voltage detection element detects a voltage signal at the input terminal of the main circuit breaker and the backup circuit voltage detection element detects no voltage signal at the input terminal of the backup circuit breaker, the controller controls the actuator to operate and locks the backup circuit breaker. When the main circuit voltage detection element detects no voltage signal at the input terminal of the main circuit breaker and the backup circuit voltage detection element detects a voltage signal at the input terminal of the backup circuit breaker, the controller controls the actuator to operate and locks the main circuit breaker.

[0011] Preferably, the main circuit voltage detection element is a main circuit transformer, and the backup circuit voltage detection element is a backup circuit transformer.

[0012] Preferably, both the main circuit transformer and the backup circuit transformer are voltage transformers.

[0013] Preferably, the controller is a PLC.

[0014] Preferably, the actuating element is an electric push rod, which is capable of reciprocating linear motion. When the electric push rod moves to the center positioning point, it can lock the main circuit breaker and the backup circuit breaker. When the electric push rod moves in a first direction to the first positioning point, it can lock the main circuit breaker. When the electric push rod moves in a second direction to the second positioning point, it can lock the backup circuit breaker. The first direction and the second direction are opposite, and the first positioning point and the second positioning point are collinear.

[0015] Preferably, the electric actuator is a linear actuator.

[0016] The present invention achieves the following technical effects compared to the prior art: The circuit switching device for an AC distribution box provided by this invention includes a manual control module, an electric control module, and an actuator. Both the manual control module and the electric control module are connected to the actuator, and the manual control module and the electric control module can control the action of the actuator respectively. That is, the manual control module can manually switch the main and backup circuits according to the actual situation, and the electric control module can realize automatic switching and protection of the circuit. In this way, multiple control modes can be used to adapt to the complex and ever-changing power consumption scenarios. When the actuator is activated, it is used to lock the main circuit breaker, or lock the backup circuit breaker, or lock the main circuit breaker and the backup circuit breaker simultaneously, so as to realize reliable control of the main and backup circuit breakers in the AC distribution box, prevent multiple circuit breakers from closing at the same time and causing electrical conflicts or short circuits, and fully ensure the safe and stable operation of the power supply system. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. 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 illustrating the working principle of the circuit switching device in the AC distribution box of this invention. Detailed Implementation

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

[0020] The purpose of this invention is to provide a circuit switching device for an AC distribution box to solve the problems existing in the prior art, adapt to the needs of complex and ever-changing power consumption scenarios, realize reliable control of the main and backup circuit breakers in the AC distribution box, and fully ensure the safe and stable operation of the power supply system.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1As shown, this embodiment provides a circuit switching device for an AC distribution box, including a manual control module, an electric control module, and an actuator. Both the manual control module and the electric control module are connected to the actuator, and the manual control module and the electric control module can control the action of the actuator respectively. That is, the manual control module can manually switch the main and backup circuits according to the actual situation, and the electric control module realizes automatic switching and protection of the circuit. In this way, multiple control modes can be used to adapt to the complex and ever-changing power consumption scenarios. When the actuator is activated, it is used to lock the main circuit breaker, or lock the backup circuit breaker, or lock the main circuit breaker and the backup circuit breaker simultaneously, so as to realize reliable control of the main and backup circuit breakers in the AC distribution box, prevent multiple circuit breakers from closing at the same time and causing electrical conflicts or short circuits, and fully ensure the safe and stable operation of the power supply system. At the same time, the overall structure is compact and highly adaptable, and can be directly integrated into existing AC distribution boxes.

[0023] Specifically, this embodiment also includes a controller and an auxiliary power supply. The auxiliary power supply is electrically connected to the controller and is used to provide electrical energy. Both the manual control module and the electric control module are electrically connected to the controller. The controller is connected to the actuator and is used to drive the actuator to operate, so as to lock the main circuit breaker, or lock the backup circuit breaker, or lock both the main circuit breaker and the backup circuit breaker, so as to realize circuit switching and protection.

[0024] During the power supply preparation phase, the auxiliary power supply is connected to supply power to the controller, actuators, and trip coils of the main circuit breaker and backup circuit breaker, and the circuit switching device of the AC distribution box enters the standby state.

[0025] The manual control module includes two manual buttons: a main circuit button and a backup circuit button. Both buttons are electrically connected to the controller, allowing for the locking of the main circuit breaker and the backup circuit breaker, respectively. Specifically, when the main circuit button is manually pressed, it sends a signal to the controller, which then controls the actuator to lock the main circuit breaker. In this case, only the backup circuit breaker can be closed. When the backup circuit button is manually pressed, it sends a signal to the controller, which then controls the actuator to lock the backup circuit breaker. In this case, only the main circuit breaker can be closed. When both buttons are pressed, they both send signals to the controller, which then controls the actuator to lock both the main and backup circuit breakers.

[0026] The electric control module includes a main circuit voltage detection element and a backup circuit voltage detection element. Both the main circuit voltage detection element and the backup circuit voltage detection element are electrically connected to the controller. The main circuit voltage detection element is used to collect the input voltage of the main circuit breaker, and the backup circuit voltage detection element is used to collect the input voltage of the backup circuit breaker. The controller can control the actuator to operate according to the voltage signals detected by the main circuit voltage detection element and the backup circuit voltage detection element, so as to automatically control the locking of the corresponding main circuit breaker and backup circuit breaker according to the main circuit and backup circuit voltage conditions, thereby realizing automatic switching and protection of the circuit.

[0027] In this embodiment, both the main circuit breaker and the backup circuit breaker are equipped with trip coils. During electric control, the voltage signal at the input terminal of the main circuit breaker is detected in real time by the main circuit voltage detection element, and the voltage signal at the input terminal of the backup circuit breaker is monitored in real time by the backup circuit voltage detection element. When the main circuit voltage detection element detects a voltage signal at the input terminal of the main circuit breaker and the backup circuit voltage detection element detects a voltage signal at the input terminal of the backup circuit breaker (i.e., when both the main circuit and the backup circuit have voltage), the controller outputs a backup circuit trip signal to the trip coil of the backup circuit breaker and controls the actuator to operate, so that the actuator locks the backup circuit breaker. At this time, only the main circuit can be closed and supplied normally. When the main circuit voltage detection element detects no voltage signal at the input terminal of the main circuit breaker and the backup circuit voltage detection element detects no voltage signal at the input terminal of the backup circuit breaker (i.e., when there is no voltage in both the main circuit and the backup circuit), the controller simultaneously outputs the main circuit trip signal and the backup circuit trip signal, and controls the actuator to lock the main circuit breaker and the backup circuit breaker to prevent accidental closing. When the main circuit voltage detection element detects a voltage signal at the input terminal of the main circuit breaker, and the backup circuit voltage detection element detects no voltage signal at the input terminal of the backup circuit breaker (i.e., the main circuit has voltage, but the backup circuit has no voltage), the controller outputs a backup circuit trip signal and controls the actuator to lock the backup circuit breaker. When the main circuit voltage detection element detects no voltage signal at the input terminal of the main circuit breaker, and the backup circuit voltage detection element detects a voltage signal at the input terminal of the backup circuit breaker (i.e., the main circuit has no voltage, but the backup circuit has voltage), the controller outputs a main circuit trip signal and controls the actuator to lock the main circuit breaker. In other words, when it is detected that one of the input terminals of the main circuit breaker and the backup circuit breaker has voltage and the other does not, the controller outputs a trip signal to the circuit without voltage and simultaneously locks the circuit without voltage to prevent closing, ultimately achieving automatic switching and protection of the circuit.

[0028] The main circuit voltage detection element is the main circuit current transformer, and the backup circuit voltage detection element is the backup circuit current transformer. Those skilled in the art can also make adaptive adjustments to its specific structure according to actual needs, as long as it can realize the voltage detection of the input terminals of the main circuit breaker and the backup circuit breaker.

[0029] Both the main circuit transformer and the backup circuit transformer are conventional voltage transformers adapted to AC voltage, which are low in cost and can meet the needs of voltage detection.

[0030] The controller can be a conventional PLC or a dedicated power distribution control module. Those skilled in the art can also make adaptive adjustments to its specific type according to actual needs.

[0031] The actuator is an electric actuator, which is installed between the main circuit breaker and the backup circuit breaker. The controller can control the positioning, locking, and tripping signal output of the electric actuator through logical judgment. The electric actuator can reciprocate linearly and has three positioning points: a first positioning point, a middle positioning point, and a second positioning point. When the electric actuator moves to the middle positioning point, it can lock both the main circuit breaker and the backup circuit breaker. When the electric actuator moves in the first direction to the first positioning point, it can lock the main circuit breaker. When the electric actuator moves in the second direction to the second positioning point, it can lock the backup circuit breaker. The first and second directions are opposite, and the first and second positioning points are collinear. The first positioning point can be the left positioning point, and the second positioning point can be the right positioning point. That is, when the electric actuator needs to move to the first positioning point, it needs to move to the left, and when the electric actuator needs to move to the second positioning point, it needs to move to the right. Those skilled in the art can also interchange them according to actual needs.

[0032] In this embodiment, the electric actuator is a small linear actuator with precise positioning function. Those skilled in the art can adjust its specific structure as long as it has three positioning points and can lock the main circuit breaker, lock the backup circuit breaker individually, or lock the main circuit breaker and the backup circuit breaker simultaneously.

[0033] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A circuit switching device for an AC distribution box, characterized in that: It includes a manual control module, an electric control module, and an actuator. The manual control module and the electric control module are both connected to the actuator, and the manual control module and the electric control module can control the operation of the actuator respectively. When the actuator is in operation, it is used to lock the main circuit breaker, or lock the backup circuit breaker, or lock the main circuit breaker and the backup circuit breaker simultaneously.

2. The circuit switching device for the AC distribution box according to claim 1, characterized in that: It also includes a controller and an auxiliary power supply, the auxiliary power supply being electrically connected to the controller and used to provide electrical energy, the manual control module and the electric control module being electrically connected to the controller, and the controller being connected to the actuator and used to drive the actuator to move.

3. The circuit switching device for the AC distribution box according to claim 2, characterized in that: The manual control module includes two manual buttons, namely a main circuit button and a backup circuit button. Both the main circuit button and the backup circuit button are electrically connected to the controller. When the main circuit button is pressed, the controller controls the actuator to lock the main circuit breaker. When the backup circuit button is pressed, the controller controls the actuator to lock the backup circuit breaker. When both the main circuit button and the backup circuit button are pressed, the controller controls the actuator to lock both the main circuit breaker and the backup circuit breaker.

4. The circuit switching device for the AC distribution box according to claim 2, characterized in that: The electric control module includes a main circuit voltage detection element and a backup circuit voltage detection element. Both the main circuit voltage detection element and the backup circuit voltage detection element are electrically connected to the controller. The main circuit voltage detection element is used to collect the input voltage of the main circuit breaker, and the backup circuit voltage detection element is used to collect the input voltage of the backup circuit breaker. The controller can control the actuator to operate based on the voltage signals detected by the main circuit voltage detection element and the backup circuit voltage detection element.

5. The circuit switching device for the AC distribution box according to claim 4, characterized in that: When the main circuit voltage detection element detects a voltage signal at the input terminal of the main circuit breaker and the backup circuit voltage detection element detects a voltage signal at the input terminal of the backup circuit breaker, the controller controls the actuator to operate and locks the backup circuit breaker. When the main circuit voltage detection element detects no voltage signal at the input terminal of the main circuit breaker and the backup circuit voltage detection element detects no voltage signal at the input terminal of the backup circuit breaker, the controller controls the actuator to operate and causes the actuator to lock the main circuit breaker and the backup circuit breaker. When the main circuit voltage detection element detects a voltage signal at the input terminal of the main circuit breaker and the backup circuit voltage detection element detects no voltage signal at the input terminal of the backup circuit breaker, the controller controls the actuator to operate and locks the backup circuit breaker. When the main circuit voltage detection element detects no voltage signal at the input terminal of the main circuit breaker and the backup circuit voltage detection element detects a voltage signal at the input terminal of the backup circuit breaker, the controller controls the actuator to operate and locks the main circuit breaker.

6. The circuit switching device for the AC distribution box according to claim 4, characterized in that: The main circuit voltage detection element is the main circuit current transformer, and the backup circuit voltage detection element is the backup circuit current transformer.

7. The circuit switching device for the AC distribution box according to claim 6, characterized in that: Both the main circuit transformer and the backup circuit transformer are voltage transformers.

8. The circuit switching device for the AC distribution box according to claim 2, characterized in that: The controller is a PLC.

9. The circuit switching device for the AC distribution box according to claim 1, characterized in that: The actuator is an electric push rod, which is capable of reciprocating linear motion. When the electric push rod moves to the center positioning point, it can lock the main circuit breaker and the backup circuit breaker. When the electric push rod moves in a first direction to the first positioning point, it can lock the main circuit breaker. When the electric push rod moves in a second direction to the second positioning point, it can lock the backup circuit breaker. The first direction and the second direction are opposite, and the first positioning point and the second positioning point are collinear.

10. The circuit switching device for the AC distribution box according to claim 9, characterized in that: The electric actuator is a linear actuator.

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