Improved operating device for low-voltage air circuit breaker

Abstract

This invention provides an improved low-voltage air circuit breaker operation device that addresses the shortcomings of conventional low-voltage air circuit breakers. In these devices, the undervoltage trip coil burns out due to continuous energization, causing the internal tripping mechanism to lock up and become damaged, thus preventing forced locking. If a tripping mechanism is used, forced locking may occur, potentially leading to accidental energization. This prevents the low-voltage air circuit breaker from being forced to close, hindering market demand. The improved low-voltage air circuit breaker operation device comprises a power supply unit, an electrical operation control unit, a manual operation restriction unit, and an external command unit. The microprocessor of the electrical operation control unit operates normally for starting and closing according to its programmed settings. The manual operation restriction unit replaces the traditional undervoltage coil, preventing burnout from prolonged energization and enabling forced starting and closing, effectively preventing accidental energization and disconnection.

Claims

1. A low-voltage air circuit breaker operation improvement device, connected to a low-voltage air circuit breaker body, the low-voltage air circuit breaker further comprising: a main contact body unit, a control power supply circuit, an electronic tripping relay, an electric motor spring energy storage unit, a manual operating handle, a spring energy storage linkage mechanism, a manual start-stop button switch, a manual close-stop button switch, a start-stop actuation mechanism, a close-stop actuation mechanism, a start-stop tripping coil, and a close-connection coil; the low-voltage air circuit breaker control improvement device includes: A power supply unit, an electrical operation control unit, a manual operation restriction unit, and an external command unit; The power supply unit steps down and rectifies the AC power into a suitable DC operating power supply, which is electrically connected to the electrical operation control unit as its operating power supply. The electrical operation control unit is electrically connected to the power supply unit and includes a microprocessor and a motor drive unit. The microprocessor executes the logic requirements of the motor drive unit according to a preset program, and interprets and sends information from the external instruction unit. When the trip coil is activated, the low-voltage air circuit breaker is opened; when the closing coil is activated, the low-voltage air circuit breaker is closed. The electrical operation control unit is electrically connected to the manual operation restriction unit. The microprocessor sends information according to a preset program to activate the manual operation restriction unit. The manual operation unit is electrically connected to the electrical operation control unit. The manual operation unit includes a forced trip electric motor, a forced trip electric motor linkage, and a manual start / stop button switch actuation unit. According to the microprocessor instructions, the manual operation unit actuates the forced trip electric motor and the forced trip electric motor linkage to actuate the start / stop mechanism of the low-voltage air circuit breaker, thus restricting the operation of the start / stop mechanism and the closing coil of the low-voltage air circuit breaker, achieving a forced start / stop function. When the manual operation unit actuates the manual start / stop button switch actuation unit according to the microprocessor instructions, it prevents the manual start / stop button switch and the start / stop trip coil from operating, achieving a forced close function. The external command... The unit is electrically connected to the electrical operation control unit. The external command unit is equipped with a normal start-up command, a normal close-up command, a forced start-up command, and a forced close-up command. When the normal start-up command is actuated, it is electrically connected to the electrical operation control unit, and the microprocessor sends a message to actuate the start-up trip coil to start the low-voltage air circuit breaker. When the normal close-up command is actuated, it is electrically connected to the electrical operation control unit, and the microprocessor sends a message to actuate the close-in coil to close the low-voltage air circuit breaker. When the forced start-up command is actuated, it is electrically connected to the electrical operation control unit, and the microprocessor sends a message to actuate the forced trip motor. The forced trip motor, in conjunction with the forced trip motor linkage rod, closes the low-voltage air circuit breaker. The opening and closing mechanism of the compressed air circuit breaker is forced to remain inactive, achieving forced locking. When the forced closing command is activated, it is electrically connected to the electrical operation control unit. The microprocessor sends a message to activate the closing coil to close the low-voltage air circuit breaker and activates the manual opening and closing button switch actuation unit to prevent the manual opening and closing button switch from operating and the opening and closing trip coil from operating, thus achieving the forced closing function. The low-voltage air circuit breaker operation improvement device allows the low-voltage air circuit breaker to open when the normal opening command is activated, close when the normal closing command is activated, forcibly open when the forced opening command is activated, and forcibly close when the forced closing command is activated.

2. A low-voltage air circuit breaker operation improvement device, connected to a low-voltage air circuit breaker body, the low-voltage air circuit breaker further comprising: a main contact body unit, a control power supply circuit, an electronic tripping relay, an electric motor spring energy storage unit, a manual operating handle, a spring energy storage linkage mechanism, a manual start-stop button switch, a manual close-stop button switch, a start-stop actuation mechanism, a close-closing actuation mechanism, a start-stop tripping coil, and a close-closing coil; the low-voltage air circuit breaker control improvement device includes: a power supply unit, an electrical operation control unit, a manual operation restriction unit, and an external command unit; the power supply unit steps down and rectifies AC power into a suitable DC operating power supply, electrically connecting it to the electrical operation control unit as the operating power supply for the electrical operation control unit; the electrical operation control unit is electrically connected to the power supply unit, the electrical operation control unit is equipped with a microprocessor and a motor drive unit, the microprocessor actuates the logic requirements of the motor drive unit according to a preset program, and interprets and sends information according to the external command unit. When the tripping coil is actuated, the low-voltage air circuit breaker opens; when the closing coil is actuated, the low-voltage air circuit breaker closes. The electrical operation control unit is electrically connected to the manual operation restriction unit. The microprocessor sends information according to a preset program to actuate the manual operation restriction unit. The manual operation restriction unit is electrically connected to the electrical operation control unit. The manual operation restriction unit is equipped with a forced tripping electric motor, a forced tripping electric motor linkage rod, a manual operation restriction motor, a manual operation restriction linkage device, and a... The stop plate, according to the microprocessor instruction, the manual operation restriction unit actuates the forced trip electric motor, which in turn actuates the forced trip electric motor linkage rod, and actuates the opening and closing mechanism of the low-voltage air circuit breaker, thereby restricting the operation of the opening and closing mechanism and the closing coil of the low-voltage air circuit breaker to achieve the forced opening and closing function. The manual operation restriction unit, according to the microprocessor instruction, actuates the manual operation restriction motor, which in turn actuates the manual operation restriction linkage device and the stop plate, thereby blocking the manual opening and closing button switch and restricting the manual operation function.The external command unit is electrically connected to the electrical operation control unit. The external command unit is equipped with a normal start-up command, a normal close-up command, a forced start-up command, and a forced close-up command. When the normal start-up command is actuated, it is electrically connected to the electrical operation control unit, and the microprocessor sends a message to actuate the start-up trip coil to start the low-voltage air circuit breaker. When the normal close-up command is actuated, it is electrically connected to the electrical operation control unit, and the microprocessor sends a message to actuate the close-in coil to close the low-voltage air circuit breaker. When the forced start-up command is actuated, it is electrically connected to the electrical operation control unit, and the microprocessor sends a message to actuate the forced trip motor. The forced trip motor, in conjunction with the forced trip motor linkage lever, closes the low-voltage air circuit breaker. The opening and closing mechanism of the low-voltage air circuit breaker is forced to remain inactive, achieving forced locking. When the forced closing command is actuated, it is electrically connected to the electrical operation control unit. The microprocessor sends a message to actuate the closing coil, closing the low-voltage air circuit breaker. It also restricts the operation of the manual operation motor, preventing the manual opening and closing push-button switches and the opening trip coil from operating, thus achieving forced closing. The low-voltage air circuit breaker operation improvement device allows the low-voltage air circuit breaker to open when the normal opening command is actuated, close when the normal closing command is actuated, forcibly open when the forced opening command is actuated, and forcibly close when the forced closing command is actuated.

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