Reliable automatic reclosing circuit breaker

Abstract

The utility model provides a reliable automatic reclosing circuit breaker which comprises a three-phase power supply module, a full-phase rectification module, an MCU control module, an AD sampling module, a reclosing motor, a power supply output module, a switch J1, a switch J2, a switch J3 and a switch J4. The A-phase output, the B-phase output and the C-phase output are respectively connected with the MCU control module through the AD sampling module; the A-phase output and the B-phase output are respectively connected with the power supply output module through a switch J1 and a switch J3 in sequence; the C-phase output is also connected with the power supply output module after sequentially passing through a switch J2 and a switch J3; the N-phase output is respectively connected with the power output module and the reclosing motor; the switch J3 is also connected with a reclosing motor through a switch J4; and the switch J1, the switch J2, the switch J3 and the switch J4 are respectively connected with the MCU control module. And when any one of the three phases is electrified and is within a normal working threshold value, the reclosing motor can be ensured to be electrified and can be automatically reclosed.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical products, in particular to a circuit breaker with reliable automatic reclosing function. Background Art

[0002] A circuit breaker is a switching device that can close, carry and interrupt current under normal circuit conditions and can close, carry and interrupt current under abnormal circuit conditions within a specified time.

[0003] See also Figure 1 , which is a schematic diagram of a circuit breaker control circuit in the prior art. Figure 1 As shown in the figure, current reclosing circuit breakers on the market only use Phase A power as the power source for the reclosing motor. Therefore, if Phase A power is lost, the circuit breaker will not automatically reclose after opening (i.e., tripping), and the circuit breaker will remain in the tripped state. This inability to close the circuit breaker can cause power outages, damage equipment, and affect power system stability. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a circuit breaker with reliable automatic reclosing function, which can realize reliable automatic closing of the circuit breaker.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A reliable automatic reclosing circuit breaker includes a three-phase power module, a full-phase rectifier module, an MCU control module, an AD sampling module, a reclosing motor, a power output module, a switch J1, a switch J2, a switch J3, and a switch J4;

[0007] The A-phase output, B-phase output, C-phase output and N-phase output of the three-phase power supply module are respectively connected to the full-phase rectifier module; the full-phase rectifier module is connected to the MCU control module; the A-phase output, B-phase output and C-phase output of the three-phase power supply module are also respectively connected to the MCU control module via the AD sampling module; the A-phase output and B-phase output of the three-phase power supply module are also respectively connected to the power output module via the switch J1 and the switch J3; the C-phase output of the three-phase power supply module is also connected to the power output module after passing through the switch J2 and the switch J3 in sequence; the N-phase output of the three-phase power supply module is also respectively connected to the power output module and the reclosing motor; the switch J3 is also connected to the reclosing motor via the switch J4; the switches J1, J2, J3 and J4 are also respectively connected to the MCU control module.

[0008] Optionally, the switch J1 , the switch J2 , the switch J3 , and the switch J4 are relay switches.

[0009] Optionally, the moving contact of the switch J1 corresponds to the A-phase output and the B-phase output respectively; the static contact of the switch J1 corresponds to the moving contact of the switch J3.

[0010] Optionally, the movable contact of the switch J3 also corresponds to the static contact of the switch J2; the static contact of the switch J3 is connected to the power output and corresponds to the movable contact of the switch J4.

[0011] Optionally, the moving contact of the switch J2 corresponds to the C-phase output.

[0012] Optionally, control ends of the switch J1 , the switch J2 , the switch J3 and the switch J4 are respectively connected to the MCU control module.

[0013] Optionally, the circuit breaker is an intelligent circuit breaker.

[0014] The beneficial effects of the present invention are as follows: the circuit breaker with reliable automatic reclosing provided by the present invention collects the three-phase output voltage value through the AD sampling module and feeds it back to the MCU control module. The MCU control module selects one phase to output to the power output module by controlling the combination switching of switches J1, J2 and J3; the reclosing motor will be powered by the power output module and will be started and stopped under the control of the MCU control module through switch J4. Since it is not limited to a specific phase output to power the reclosing motor, but when any phase of the three phases has power and is within the normal operating threshold, it can be ensured that the reclosing motor is powered and can automatically reclose. Therefore, the circuit breaker of the present invention can ensure the power supply of the reclosing motor after opening, and realize the reliable execution of the automatic reclosing function; thereby ensuring the restoration of power supply, protecting equipment from damage and the stability of the power system. In addition, through the sampling of the AD sampling module and the judgment of the MCU control module, it will be possible to ensure that the circuit breaker's reclosing motor operates within the normal working range, avoiding damage to the reclosing motor operation; furthermore, the power output module can provide an additional single-phase power output after three-phase switching to supply power to the outside, meeting more user needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of a circuit breaker control circuit in the prior art;

[0016] Figure 2 A schematic diagram of the structural composition and connection of a circuit breaker with reliable automatic reclosing provided by an embodiment of the utility model.

[0017] Description of labels:

[0018] 1. Three-phase power supply module; 2. Full-phase rectifier module; 3. MCU control module; 4. AD sampling module;

[0019] 5. Reclosing motor; 6. Power output module. DETAILED DESCRIPTION

[0020] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.

[0021] Please refer to Figure 2 , the embodiments of the present utility model are:

[0022] This embodiment provides a circuit breaker with reliable automatic reclosing function, such as Figure 2 As shown, it includes a three-phase power supply module, a full-phase rectifier module, an MCU control module, an AD sampling module, a reclosing motor, a power output module, a switch J1, a switch J2, a switch J3 and a switch J4.

[0023] Among them, the A-phase output Ua, B-phase output Ub, C-phase output Uc and N-phase output Un of the three-phase power module are respectively connected to the full-phase rectifier module; the full-phase rectifier module is further connected to the MCU control module; the A-phase output Ua, B-phase output Ub and C-phase output Uc of the three-phase power module are also respectively connected to the MCU control module via the AD sampling module; the A-phase output Ua and B-phase output Ub of the three-phase power module are also respectively connected to the power output module via the switch J1 and the switch J3; the C-phase output Uc of the three-phase power module is also connected to the power output module after passing through the switch J2 and the switch J3 in sequence; the N-phase output Un of the three-phase power module is also respectively connected to the power output module and the reclosing motor; the switch J3 is also connected to the reclosing motor via the switch J4; the switches J1, J2, J3 and J4 are also respectively connected to the MCU control module.

[0024] In some specific implementations of this embodiment, the switch J1, the switch J2, the switch J3, and the switch J4 are relay switches, but they may also be other devices with switch functions.

[0025] In some specific implementations of this embodiment, the moving contact of the switch J1 corresponds to the A-phase output and the B-phase output respectively; the static contact of the switch J1 corresponds to the moving contact of the switch J3; and the control end of the switch J1 is connected to the MCU control module;

[0026] In some specific implementations of this embodiment, the moving contact of the switch J3 corresponds to the static contact of the switch J2 and the static contact of the switch J1 respectively; the static contact of the switch J3 is divided into two paths, one path is connected to the power output, and the other path corresponds to the moving contact of the switch J4; the control end of the switch J3 is connected to the MCU control module.

[0027] In some specific implementations of this embodiment, the moving contact of the switch J2 corresponds to the C-phase output Uc; the static contact of the switch J2 corresponds to the moving contact of the switch J3; and the control end of the switch J2 is connected to the MCU control module.

[0028] In some specific implementations of this embodiment, the circuit breaker is an intelligent circuit breaker.

[0029] The working principle of the circuit breaker with reliable automatic reclosing provided by this embodiment is as follows:

[0030] The three-phase output of the three-phase power module is rectified and filtered by the full-phase rectifier module before being output to the MCU control module, providing power to the MCU control module. Simultaneously, the three-phase output of the three-phase power module is sampled by the AD sampling module and transmitted to the MCU control module. The MCU control module compares the three-phase output voltage values ​​collected by the AD sampling module with pre-set startup values ​​and thresholds. Based on the comparison results, it controls the switching of switches J1, J2, and J3, selecting a phase for output according to a preset priority order, and sending it to the power output module. The reclosing motor, powered by the power output module, starts and stops the circuit breaker (i.e., reclosing) through the MCU control module's control of switch J4.

[0031] Specifically, the MCU control module controls the combined switching logic of switches J1, J2, and J3 according to the three-phase output voltage value as follows:

[0032] Switch J1 and switch J3 control the power output module to switch to connect to phase A output or phase B output; switch J2 and switch J3 control the power output module to switch to connect to phase C output or no output.

[0033] If the A-phase output voltage, B-phase output voltage, and C-phase output voltage collected by the MCU control module through the AD sampling module all reach the preset starting value and do not exceed the preset normal operating threshold, the MCU control module controls switch J and switch J3 to switch to the A-phase output first, and outputs the A-phase to the power output module and the reclosing motor;

[0034] If the A-phase output is short of power or the A-phase output voltage exceeds the normal operating threshold, the MCU control module controls switch J1 and switch J3 to switch to the B-phase output, and outputs the B-phase to the power output module and the reclosing motor;

[0035] If both phase A and phase B outputs are out of power or their voltages exceed the normal operating threshold, the MCU control module controls switches J2 and J3 to switch to phase C output, which is then fed to the power output module and the reclosing motor.

[0036] If the output voltage of phase A, phase B, and phase C all exceed the normal operating threshold, the MCU control module controls switches J1, J2, and J3 to disconnect the outputs of phases A, B, and C to protect the subsequent circuits and the reclosing motor, preventing excessive voltage from causing damage to the subsequent circuits.

[0037] The MCU control module will collect the output voltages of phases A, B, and C in real time, and execute the above judgments and actions to ensure the power output and the operation of the reclosing motor.

[0038] The circuit breaker with reliable automatic reclosing provided by this embodiment has at least the following advantages:

[0039] 1. If any one of the three phases A, B, and C has power and is within the normal operating threshold range, the circuit breaker can operate normally. Even after the circuit breaker is opened, the reclosing motor can still be powered normally, realizing the automatic reclosing function.

[0040] 2. It can ensure that the reclosing motor of the circuit breaker operates within the normal working range, effectively avoid the damage to the reclosing motor caused by too high or too low power supply voltage, and effectively extend the service life of the circuit breaker;

[0041] 3. The power output module can provide an additional single-phase output power supply with three-phase power switching function to power the external power supply, giving the circuit breaker more functions.

[0042] To sum up, the reliable automatic reclosing circuit breaker provided by the utility model can not only realize the reliable automatic closing of the circuit breaker, but also ensure that the reclosing motor of the circuit breaker operates within the normal working range, avoiding damage to the reclosing motor operation; furthermore, it can also provide an additional single-phase power output after three-phase switching through the power output module to power the outside, thereby meeting more user needs.

[0043] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the description and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A circuit breaker with reliable automatic reclosing, characterized in that: It includes three-phase power supply module, full-phase rectifier module, MCU control module, AD sampling module, reclosing motor, power output module, switch J1, switch J2, switch J3 and switch J4; The A-phase output, B-phase output, C-phase output and N-phase output of the three-phase power supply module are respectively connected to the full-phase rectifier module; the full-phase rectifier module is connected to the MCU control module; the A-phase output, B-phase output and C-phase output of the three-phase power supply module are also respectively connected to the MCU control module via the AD sampling module; the A-phase output and B-phase output of the three-phase power supply module are also respectively connected to the power output module via the switch J1 and the switch J3; the C-phase output of the three-phase power supply module is also connected to the power output module after passing through the switch J2 and the switch J3 in sequence; the N-phase output of the three-phase power supply module is also respectively connected to the power output module and the reclosing motor; the switch J3 is also connected to the reclosing motor via the switch J4; the switches J1, J2, J3 and J4 are also respectively connected to the MCU control module.

2. The circuit breaker with reliable automatic reclosing according to claim 1, characterized in that: The switch J1 , the switch J2 , the switch J3 , and the switch J4 are relay switches.

3. The circuit breaker with reliable automatic reclosing according to claim 1, characterized in that: The moving contact of the switch J1 corresponds to the A-phase output and the B-phase output respectively; the static contact of the switch J1 corresponds to the moving contact of the switch J3.

4. The circuit breaker with reliable automatic reclosing according to claim 3, characterized in that: The movable contact of the switch J3 also corresponds to the static contact of the switch J2; the static contact of the switch J3 is connected to the power output and corresponds to the movable contact of the switch J4.

5. The circuit breaker with reliable automatic reclosing according to claim 4, characterized in that: The moving contact of the switch J2 corresponds to the C-phase output.

6. The circuit breaker with reliable automatic reclosing according to claim 1, characterized in that: The control ends of the switch J1 , the switch J2 , the switch J3 and the switch J4 are respectively connected to the MCU control module.

7. The circuit breaker with reliable automatic reclosing according to claim 1, characterized in that: The circuit breaker is an intelligent circuit breaker.

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