A device and control method for preventing mis-triggering of circuit breaker

Abstract

The present invention relates to the technical field of high-voltage devices, and discloses an anti-false triggering device for a circuit breaker, comprising a system power supply, wherein the system power supply is connected to a switch control module through a voltage monitoring module, and is connected to a processor through a voltage conversion module, wherein the processor is connected to the switch control module through a state monitoring module, wherein the switch control module is connected to a power supply part of a drive module, wherein the processor is connected to a control part of the drive module, wherein the drive module is connected to a mechanical structure of a circuit breaker, and is used to drive the mechanical structure to perform a switch-on and switch-off action, wherein the voltage monitoring module is used to monitor whether the voltage of the system power supply is lower than a threshold voltage, and if so, generates a locking signal, otherwise, generates a conduction signal, and wherein the state monitoring module is used to monitor whether the processor is in a dead state, and if so, generates a locking signal, and if not, generates a conduction signal. The present invention has a simple structure, is easy to operate, and is conducive to popularization and application.

Description

Technical Field

[0001] The present invention relates to the technical field of high voltage devices, and in particular to an anti-false triggering device and a control method for a circuit breaker. Background Art

[0002] Flexible DC transmission is a new transmission technology based on voltage source converters, self-switching devices and pulse width modulation (PWM). This technology has the advantages of supplying power to passive networks, no phase-changing failures, no communication between phase-changing stations, and easy construction of multi-terminal DC systems. It has strong technical advantages in applications such as island power supply and capacity expansion and transformation of urban distribution networks.

[0003] In the high-voltage flexible direct current transmission system, direct current and alternating current are converted to each other through the converter station. The high-voltage direct current circuit breaker is one of the main electrical equipment of the converter station. It can not only cut off and connect the high-voltage line and various no-load and load currents when the system is operating normally, but also automatically, quickly and reliably cut off various overload and short-circuit currents through the action of the relay protection device when the system fails, so as to prevent the scope of the accident from expanding.

[0004] High-voltage DC circuit breakers are products that deeply integrate primary and secondary functions. The circuit breaker itself should also have a very reliable ability to prevent false operation. In addition to the control commands issued by the upper protection, it cannot have false triggering and false operation under any working conditions. This is an extremely critical and important requirement for the reliability of the circuit breaker itself. In the circuit design of the complex secondary control system of the DC circuit breaker, how to ensure the ability of the entire control system to prevent false triggering is very important. Summary of the invention

[0005] The present invention provides an anti-false triggering device and a control method for a circuit breaker, which improve the anti-false triggering capability of the entire control system and ensure the reliability of the circuit breaker itself.

[0006] The present invention can be achieved through the following technical solutions:

[0007] A device for preventing false triggering of a circuit breaker comprises a system power supply, wherein the system power supply is connected to a switch control module through a voltage monitoring module, and is connected to a processor through a voltage conversion module, the processor is connected to the switch control module through a state monitoring module, the switch control module is connected to a power supply part of a drive module, the processor is connected to a control part of the drive module, the drive module is connected to a mechanical structure of the circuit breaker and is used to drive the mechanical structure to perform opening and closing actions, the voltage monitoring module is used to monitor whether the voltage of the system power supply is lower than a threshold voltage, and if so, a locking signal is generated, otherwise, a conduction signal is generated, and the state monitoring module is used to monitor whether the processor is in a dead state, and if so, a locking signal is generated, and if not, a conduction signal is generated.

[0008] Furthermore, the state monitoring module includes a monostable trigger connected to an IO port of the processor, and the monostable trigger is connected to the switch control module. After each task in the processor is executed, an indication value is written to the register corresponding to the one IO port, so that the output of the one IO port is in square wave form.

[0009] Furthermore, the voltage monitoring module includes a comparator, a positive end of the comparator is connected to the system power supply, a reverse end is connected to a reference power supply for generating a threshold voltage, and an output end is connected to the switch control module.

[0010] Furthermore, the switch control module is constructed using a field effect transistor.

[0011] A control method for the anti-false triggering device for a circuit breaker based on the above-mentioned method monitors whether the voltage of the system power supply is lower than the threshold voltage through a voltage monitoring module, and monitors whether the processor is in a dead state through a state monitoring module. If it is lower than the threshold voltage or in a dead state, a locking signal is generated, and the switch control module receives the locking signal and cuts off the power supply part of the drive module. Otherwise, a conduction signal is generated, and the switch control module receives the conduction signal, and the system power supply supplies power to the drive module, thereby controlling the opening and closing operations of the circuit breaker.

[0012] Furthermore, the state monitoring module determines whether the processor is in a dead state by monitoring whether the output of an IO port of the processor is a square wave.

[0013] The beneficial technical effects of the present invention are as follows:

[0014] The voltage monitoring module is used to monitor whether the voltage of the system power supply is lower than the threshold voltage. At the same time, the status monitoring module is used to monitor whether the processor is in a dead state. If it is lower than the threshold voltage or in a dead state, a lockout signal is generated. The switch control module receives the lockout signal and cuts off the power supply of the drive module. Otherwise, a conduction signal is generated. The switch control module receives the conduction signal, and the system power supply supplies power to the drive module, thereby controlling the opening and closing operations of the circuit breaker, reducing the false triggering of the circuit breaker that may occur during the system power-on and power-off process and the processor operation process, improving the anti-false triggering capability of the entire control system, improving the reliability of the DC circuit breaker, and ensuring the anti-false operation capability of the entire control system under various working conditions and interference environments. In addition, the entire device has a simple structure and is easy to operate, which is conducive to popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the overall circuit block diagram of the present invention. DETAILED DESCRIPTION

[0016] The specific implementation of the present invention will be described in detail below with reference to the accompanying drawings.

[0017] like Figure 1 As shown, the present invention provides an anti-false triggering device for a circuit breaker, comprising a system power supply, wherein the system power supply is connected to a switch control module through a voltage monitoring module, and is connected to a processor through a voltage conversion module, the processor is connected to the switch control module through a state monitoring module, the switch control module is connected to a power supply part of a drive module, the processor is connected to a control part of the drive module, the drive module is connected to a mechanical structure of the circuit breaker, and is used to drive the mechanical structure to perform opening and closing actions, the voltage monitoring module is used to monitor whether the voltage of the system power supply is lower than a threshold voltage, and if so, a locking signal is generated, otherwise, a conduction signal is generated, and the state monitoring module is used to monitor whether the processor is in a dead state, and if so, a locking signal is generated, and if not, a conduction signal is generated. In this way, when the entire system is in the power-on and power-off state, the voltage monitoring module monitors whether the voltage of the system power supply is lower than the threshold voltage. If so, a lockout signal is generated, and the switch control module cuts off the power supply of the system power to the drive module, thereby reducing the false triggering of the circuit breaker caused by the unstable state of the system power-on and power-off process; and when the processor is in the working process, the state monitoring module monitors whether the processor is in a dead state. If dead, a lockout signal is generated, and the switch control module also cuts off the power supply of the system power to the drive module, thereby reducing the false triggering of the circuit breaker caused by the sudden dead of the processor.

[0018] The state monitoring module includes a monostable trigger connected to an IO port of the processor, and the monostable trigger is connected to the switch control module. In order to detect the working state of the processor, an indication value is written to a register corresponding to an IO port after each task in the processor is executed, so that the output of the IO port is in a square wave form. In this way, when a task in the processor is not executed or is completely executed, an indication value will not be written to the corresponding register, and the output of the corresponding IO port will not flip. Then, the output of the monostable trigger connected thereto will change from a temporary stable state to a stable state, and this change will be used as a locking signal and transmitted to the switch control module, and the switch control module will cut off the power supply of the system power to the drive module, thereby reducing the false triggering of the circuit breaker caused by the sudden crash of the processor.

[0019] The voltage monitoring module includes a comparator, whose positive end is connected to the system power supply, the reverse end is connected to the reference power supply that generates the threshold voltage, and the output end is connected to the switch control module. Generally, the power required by the hardware control circuit of the circuit breaker is 15 volts, that is, the voltage of the system power supply is 15 volts. When the voltage of the system power supply is above 10 volts, the hardware circuit will be in a relatively stable working state. Therefore, the threshold voltage is set to 10 volts. In this way, when the voltage of the system power supply is lower than 10 volts, the output of the comparator will flip, and this change will be used as a locking signal. The switch control module will cut off the power supply of the system power to the drive module, thereby reducing the false triggering of the circuit breaker caused by the unstable state of the system power on and off process.

[0020] The switch control module can be constructed using field effect transistors, and of course other similar switch control circuits are applicable. The voltage conversion module uses DC / DC direct current power conversion to convert the voltage of the 15 volt system power supply into the voltage required for the processor to work.

[0021] The present invention also provides a control method for the anti-false triggering device for circuit breakers described above, wherein the voltage of the system power supply is monitored by the voltage monitoring module to see whether it is lower than the threshold voltage, and the state monitoring module is used to monitor whether the processor is in a dead state. If it is lower than the threshold voltage or in a dead state, a blocking signal is generated, and the switch control module receives the blocking signal to cut off the power supply part of the drive module. Otherwise, a conduction signal is generated, and the switch control module receives the conduction signal, and the system power supply supplies power to the drive module, thereby controlling the opening and closing operation of the circuit breaker. The state monitoring module determines whether the processor is in a dead state by monitoring whether the output of an IO port of the processor is a square wave. Specifically, the register corresponding to the above IO port is set to store the indication value after each task in the processor is executed, indicating that the task has been executed. If a task is not executed or completely executed, it means that the processor is in a dead state, and there is no corresponding indication value written into the corresponding register, so that the output of the above IO port will not flip, and this is used as a blocking signal, which is sent to the switch control module to cut off the power supply to the drive module.

[0022] Although specific embodiments of the present invention are described above, those skilled in the art should understand that these are merely examples and that various changes or modifications may be made to these embodiments without departing from the principles and essence of the present invention. Therefore, the scope of protection of the present invention is limited by the appended claims.

Claims

1. A device for preventing mis-triggering of a circuit breaker, characterized in that: It includes a system power supply, which is connected to a switch control module through a voltage monitoring module and to a processor through a voltage conversion module. The processor is connected to the switch control module through a state monitoring module, the switch control module is connected to a power supply part of a drive module, the processor is connected to a control part of the drive module, the drive module is connected to a mechanical structure of a circuit breaker and is used to drive the mechanical structure to perform opening and closing actions. The voltage monitoring module is used to monitor whether the voltage of the system power supply is lower than a threshold voltage. If so, a locking signal is generated; otherwise, a conduction signal is generated. The state monitoring module is used to monitor whether the processor is in a dead state. If so, a locking signal is generated; otherwise, a conduction signal is generated.

2. The device for preventing mis-triggering of a circuit breaker according to claim 1, characterized in that: The state monitoring module includes a monostable trigger connected to an IO port of the processor, and the monostable trigger is connected to the switch control module. After each task in the processor is executed, an indication value is written to the register corresponding to the one IO port, so that the output of the one IO port is in square wave form.

3. The device for preventing mis-triggering of a circuit breaker according to claim 1, characterized in that: The voltage monitoring module comprises a comparator, a positive end of the comparator is connected to a system power supply, a reverse end is connected to a reference power supply for generating a threshold voltage, and an output end is connected to a switch control module.

4. The device for preventing mis-triggering of a circuit breaker according to claim 2, characterized in that: The switch control module is constructed using a field effect transistor.

5. A control method for the circuit breaker anti-false triggering device according to claim 1, characterized in that: The voltage monitoring module is used to monitor whether the voltage of the system power supply is lower than the threshold voltage. At the same time, the status monitoring module is used to monitor whether the processor is in a dead state. If it is lower than the threshold voltage or in a dead state, a locking signal is generated. The switch control module receives the locking signal and cuts off the power supply of the drive module. Otherwise, a conduction signal is generated. The switch control module receives the conduction signal, and the system power supply supplies power to the drive module, thereby controlling the opening and closing operations of the circuit breaker.

6. The control method for the circuit breaker anti-false triggering device according to claim 5, characterized in that: The state monitoring module determines whether the processor is in a dead state by monitoring whether the output of an IO port of the processor is a square wave.

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