Automatic closing control module and control method for anti-reverse power supply switch

Abstract

The present invention discloses an automatic closing control module and control method for an anti-backward power supply switch, wherein the automatic closing control module is provided with a manual and automatic closing switch, and the automatic closing control module of the low-voltage anti-backward power supply switch includes a microprocessor, which is connected to a data storage center, a signal acquisition submodule, an input module, a human-computer interaction display screen and an undervoltage tripping device. The information input by the signal acquisition submodule and the input module is processed by the microprocessor to form a control signal output to control the closing action and the action of the undervoltage tripping device, and the signals collected in the signal acquisition submodule, the information input by the key and the output control action signal are displayed through the human-computer interaction display screen. The present invention can effectively prevent low-voltage backward power supply in advance, avoid electric shock accidents of maintenance personnel, ensure personal safety, and greatly improve the work efficiency of power outage operations in the distribution network, and improve the reliability, stability and safety level of power supply.

Description

Technical Field

[0001] The present invention relates to the field of circuit switches, and in particular to an automatic closing control module and a control method for an anti-reverse power supply switch. Background Art

[0002] At present, rural power grid transformation projects and distribution network fault repair operations are frequent. Line operation and maintenance personnel are unable to predict and grasp the situation of unauthorized power generation. The safety of distribution network line operations is no longer guaranteed. Electric shock to personnel due to abnormal backflow of electricity has become one of the main safety risks in distribution network operations.

[0003] At the same time, the line operation environment is complex, and the situation of self-generated electricity being fed back to the line after a power outage often occurs, making it difficult to effectively supervise.

[0004] Although there are similar studies on the technology of preventing the backflow of power from self-contained power sources in China, all of them trip the circuit breaker after detecting the backflow of power. However, there is still a risk of electric shock. It is a post-event control and does not play a role in pre-emptive prevention.

[0005] Therefore, there is an urgent need to effectively control the low-voltage anti-backflow switch. Summary of the invention

[0006] The main technical problem solved by the present invention is to provide a control module and a control method for a low-voltage anti-backward power switch, which can automatically control the action of the anti-backward power switch to prevent the risk of electric shock caused by backflow.

[0007] In order to solve the above technical problems, a technical solution adopted by the present invention is:

[0008] A low-voltage anti-backflow switch automatic closing control module, the automatic closing control module is provided with a manual and automatic closing switch, the low-voltage anti-backflow switch automatic closing control module includes a microprocessor, the microprocessor is connected to a data storage center, a signal acquisition submodule, an input module, a human-computer interaction display screen and an undervoltage release device, the information input by the signal acquisition submodule and the input module is processed by the microprocessor to form a control signal output to control the closing action and the action of the undervoltage release device, and the signals collected in the signal acquisition submodule, the information input by the key and the output control action signal are displayed through the human-computer interaction display screen.

[0009] In a preferred embodiment of the present invention, the signal acquisition submodule includes a signal acquisition circuit, and the signal sources acquired by the signal acquisition circuit include current transformers, incoming line voltage, outgoing line voltage and shell temperature; the signals collected in the signal acquisition circuit are displayed together with the information input by the keys and the control action signals output after processing through a human-computer interaction display screen.

[0010] In a preferred embodiment of the present invention, the signal acquisition circuit structures of the incoming line voltage and the outgoing line voltage in the signal acquisition submodule are the same, and the signal acquisition circuit includes two parts, one is an AC-to-DC power supply circuit composed of a diode bridge rectifier circuit, and the other is a signal amplification circuit composed of a voltage-dividing resistor and an integrated operational amplifier. The AC-to-DC power supply circuit composed of the diode bridge rectifier circuit is connected to the signal amplification circuit, and the collected AC voltage signal is amplified by the integrated operational amplifier and then input into the microprocessor.

[0011] In a preferred embodiment of the present invention, the microprocessor is also provided with a clock signal, the clock signal controls the delay time of the undervoltage release device, and the clock signal is displayed through a human-computer interaction display screen.

[0012] In a preferred embodiment of the present invention, the undervoltage tripping device includes an energy storage circuit and a tripping control circuit connected to a power module of a low-voltage anti-backward power switch, wherein the energy storage circuit is composed of a voltage regulator tube and a capacitor group connected in series, and the tripping control circuit is composed of a magnetic flux switch circuit connected to a field effect tube, and the gate of the field effect tube is connected to the control signal output terminal of the microprocessor and can receive a pulse control signal of the microprocessor.

[0013] In a preferred embodiment of the present invention, a communication circuit is also provided on the microprocessor, and the communication circuit is connected to the network so as to be able to transmit the data on the human-computer interaction display screen to the prefabricated software in real time.

[0014] The present invention also relates to an automatic closing control method for an anti-reverse power supply switch, which is performed as follows:

[0015] When the automatic closing control module is set in the automatic closing state, it will first automatically check whether the voltage condition at the incoming line is normal and whether the voltage at the outgoing line is lower than the control voltage requirement. It will also check the current transformer signal to see if there is a short circuit tripping condition and the switch opening state and whether the switch housing temperature is normal. If normal, it will automatically close. The control voltage is 10~100V.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention adds an automatic closing control module with an undervoltage tripping device to a commonly used low-voltage switch, which can monitor the voltage of the upper and lower terminals of the low-voltage circuit breaker online, and realize automatic opening and closing of the circuit breaker by monitoring the logic judgment of pressure and no pressure. It effectively prevents low-voltage reverse power transmission in advance, avoids electric shock accidents of maintenance personnel, ensures personal safety, and greatly improves the efficiency of power outage operations in the distribution network, reduces the deployment of security measures and power outage time, improves power supply reliability, and improves the stability and safety level of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural block diagram of the present invention;

[0019] Figure 2 This is the general diagram of the AC voltage signal acquisition and amplification circuit;

[0020] Figure 3 It is the control circuit diagram of the undervoltage anti-tripping device;

[0021] Figure 4 It is a schematic diagram of the circuit connection of the illustrated embodiment in the anti-backflow switch. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood by people with ordinary skills in the field. The words "first", "second" and similar words used in this embodiment do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Install", "connect", "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. "Up", "down", "left", "right", "horizontal" and "vertical" are only used relative to the orientation of the components in the drawings. These directional terms are relative concepts. They are used for description and clarification relative to the components, and they can change accordingly according to the change of the orientation of the components in the drawings.

[0024] like Figure 1As shown, the automatic closing control module for the low-voltage anti-backward power supply switch of this embodiment is provided with a manual and automatic closing switch. The automatic closing control module of the low-voltage anti-backward power supply switch includes a microprocessor, and the microprocessor is connected to a data storage center, a signal acquisition submodule, an input module, a human-computer interaction display screen and an undervoltage release device. The information input by the signal acquisition submodule and the input module is processed by the microprocessor to form a control signal output to control the closing action and the action of the undervoltage release device. The signals collected in the signal acquisition submodule, the information input by the key and the output control action signal are displayed through the human-computer interaction display screen.

[0025] In the automatic control state, the automatic closing control module is centered on the Renesas R5F100LG microprocessor, and relies on the Renesas R5F100LG microprocessor to automatically connect the data storage center, the signal acquisition submodule, the key input mechanism and the human-computer interaction display screen. Through the automatic closing control software, the information input by the signal acquisition submodule and the key input mechanism is processed by the microprocessor to form a pulse control signal output to control the action of the motor and the undervoltage release device; the signal acquisition submodule includes a signal acquisition circuit, and the information collected by the signal acquisition circuit includes the signal of the current transformer to determine the overall current on-off status, the incoming voltage signal to see whether the voltage of the incoming part is normal, the outgoing voltage signal to see whether the load end voltage is normal and the temperature sensor signal to see whether the temperature of the entire switch housing is abnormal. If the above information is abnormal, the entire switch maintains the circuit breaker state; all the information collected in the signal acquisition circuit and the key input information and the output control action signal are displayed through the human-computer interaction display screen. The microprocessor is also provided with a clock signal, which controls the generation time of the output signal. The clock signal is displayed through the human-computer interaction display screen. The microprocessor is also provided with a communication circuit, which is connected to the network and can transmit the data on the human-computer interaction display screen to the remote control software in real time. Through the remote control software, relevant technicians can understand the on-site conditions in real time.

[0026] like Figure 2 As shown, the signal acquisition circuits of the incoming line voltage and the outgoing line voltage in the signal acquisition submodule are the same, and the signal acquisition circuit includes two parts, one is an AC-to-DC power supply circuit composed of a diode bridge rectifier circuit, and the other is a signal amplification circuit composed of a voltage-dividing resistor and an integrated operational amplifier. The AC-to-DC power supply circuit composed of the diode bridge rectifier circuit is connected with the signal amplification circuit, and the collected AC voltage signal is amplified by the integrated operational amplifier and then input into the microprocessor.

[0027] Among them, the AC-to-DC power supply circuit includes diode bridges B1, B2, B3, resistors R9, R14, R28, R91, R36, R97, capacitors C12, C14, C4, and the signal amplification circuit includes resistors R11, R22, R33, R2, R13, R19, R23, R30, R34, and capacitors C2, C7, C13.

[0028] like Figure 3 As shown, the control circuit of the undervoltage tripping device includes an energy storage circuit and a tripping control circuit. The energy storage circuit is composed of a low-voltage energy storage circuit formed by a L7805 voltage regulator tube and a capacitor group composed of C10, C11, C12, C13, C17, C18, C19, and C20 in series. The tripping control circuit is composed of a flux switch circuit connected to a FIR3N80LG field effect tube. The gate of the FIR3N80LG field effect tube is connected to the control signal output end of the microprocessor. The energy storage circuit can provide a driving power supply for the flux switch circuit after the low-voltage anti-reverse power switch loses pressure. The microprocessor outputs a pulse signal after processing the information collected by the signal acquisition module and the key input information. The circuit connection itself is the basic circuit form of the voltage regulator tube and the field effect tube.

[0029] like Figure 4 As shown, this embodiment is used on a low-voltage anti-backward power switch, which includes a three-phase power supply module and an automatic closing control module. The three-phase switch power supply module and the automatic closing control module are connected through a switch input line, and the automatic closing control module is connected to the load through a switch output line. An input line voltage sampling point is set on the switch input line, and an output line voltage sampling point is set on the switch output line. The input line voltage sampling point and the output line voltage sampling point are connected to the automatic closing control module. An undervoltage tripping device is also installed on the automatic closing control module. The undervoltage tripping device has a delayed tripping function. The driving energy for the delayed tripping of the undervoltage tripping device is provided by the energy storage circuit connected to the three-phase power supply module. A manual and automatic closing switching switch is also provided on the automatic closing control module. The manual control and automatic control states are switched by the manual and automatic closing switching switch. When the automatic closing control module is switched to the automatic control state, it starts to work.

[0030] The working principle of this embodiment is as follows:

[0031] When the automatic closing control module is set in the automatic closing state, the automatic closing control software first automatically checks whether the voltage condition at the incoming line is normal and whether the voltage at the outgoing line is lower than the control voltage requirement. The control requirement voltage is generally 50V, and the specific value can be adjusted within the range of 10~100V through the keyboard input terminal. Check the current transformer signal to see if there is a short circuit tripping condition and the open state of the switch and whether the shell temperature of the switch is normal. Only when all the above information meets the control requirements in the automatic closing control software, the automatic closing action can be performed.

[0032] When closing the switch, the microprocessor first samples the voltage at the load end of the switch output line to detect whether the voltage at the load end exceeds the preset protection voltage value. When there is no voltage at the load end or the voltage is less than the protection setting voltage, the system enters the delayed (default 10S) closing process.

[0033] During the 10S delay process: the energy storage circuit starts to work, and the microprocessor sends a pulse signal to maintain the operation of the undervoltage release device. After the delay, if the load-end voltage detection is still normal, the system executes the load-release closing. If the load-end voltage detection is abnormal, the microprocessor interrupts the pulse signal to activate the undervoltage release device. The above method can lock the closing and opening buttons, realize the automatic disconnection and isolation of the low-voltage circuit breaker during line power outage, and automatically close the circuit breaker during normal power supply, effectively preventing low-voltage reverse power supply in advance.

[0034] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An automatic closing control module for an anti-reverse power supply switch, wherein the automatic closing control module is provided with a manual and automatic closing switch, characterized in that: The automatic closing control module for the anti-backflow switch includes a microprocessor, which is connected to a data storage center, a signal acquisition submodule, an input module, a human-computer interaction display screen and an undervoltage tripping device. The information input by the signal acquisition submodule and the input module is processed by the microprocessor to form a control signal output to control the closing action and the action of the undervoltage tripping device. The signals collected in the signal acquisition submodule, the information input by the key and the output control action signal are displayed on the human-computer interaction display screen; The signal acquisition submodule includes a signal acquisition circuit, and the signal sources acquired by the signal acquisition circuit include a current transformer, an incoming line voltage, an outgoing line voltage and a housing temperature; The signal acquisition circuit structures of the incoming line voltage and the outgoing line voltage in the signal acquisition submodule are the same. The signal acquisition circuit includes two parts, one is an AC-to-DC power supply circuit composed of a diode bridge rectifier circuit, and the other is a signal amplification circuit composed of a voltage divider resistor and an integrated operational amplifier. The AC-to-DC power supply circuit composed of the diode bridge rectifier circuit is connected with the signal amplification circuit, and the collected AC voltage signal is amplified by the integrated operational amplifier and then input into the microprocessor; The microprocessor is also provided with a clock signal, and the clock signal controls the delay time of the undervoltage tripping device; The undervoltage tripping device includes an energy storage circuit and a tripping control circuit connected to a power module of an anti-backward power supply switch, wherein the energy storage circuit is composed of a voltage regulator tube and a capacitor group connected in series, and the tripping control circuit is composed of a magnetic flux switch circuit connected to a field effect tube, and the gate of the field effect tube is connected to the control signal output terminal of a microprocessor and can receive a pulse control signal of the microprocessor.

2. The automatic closing control module for the anti-reverse power supply switch according to claim 1 is characterized in that: The microprocessor is also provided with a communication circuit, and the communication circuit is connected to a network.

3. A control method for the automatic closing control module for the anti-reverse power supply switch according to claim 1, characterized in that: Proceed as follows: When the automatic closing control module is set in the automatic closing state, it will first automatically check whether the voltage condition at the incoming line is normal and whether the voltage at the outgoing line is lower than the control voltage requirement. It will also check the current transformer signal to see if there is a short circuit tripping condition and the switch opening state and whether the switch housing temperature is normal. If normal, it will automatically close. The control voltage is 10~100V.

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