CN218940773U - Air switch remote monitoring system - Google Patents
Air switch remote monitoring system Download PDFInfo
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- CN218940773U CN218940773U CN202223150339.9U CN202223150339U CN218940773U CN 218940773 U CN218940773 U CN 218940773U CN 202223150339 U CN202223150339 U CN 202223150339U CN 218940773 U CN218940773 U CN 218940773U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
Abstract
The utility model relates to the technical field of online detection and provides an air switch remote monitoring system which comprises a main control unit, a wireless communication unit, a leakage detection circuit and a tripping control circuit, wherein the leakage detection circuit and the tripping control circuit are both connected with the main control unit, and the main control unit is in communication connection with an upper computer by virtue of the wireless communication unit; the leakage detection circuit comprises a current transformer, a resistor R2, an operational amplifier U1, a resistor R5, an operational amplifier U2 and a resistor R7, wherein the inverting input end of the operational amplifier U1 is connected with the first end of the current transformer coil L1, the second end of the current transformer coil L1 is grounded, the non-inverting input end of the operational amplifier U1 is grounded, the output end of the operational amplifier U1 is connected with the non-inverting input end of the operational amplifier U2, the inverting input end of the operational amplifier U2 is grounded, the output end of the operational amplifier U2 is connected with the inverting input end of the operational amplifier U2 through the resistor R7, and the output end of the operational amplifier U2 is connected with the master control unit. Through above-mentioned technical scheme, solve the unable problem of eliminating the action dead zone of electric leakage of air switch in the prior art.
Description
Technical Field
The utility model relates to the technical field of online detection, in particular to an air switch remote monitoring system.
Background
An air switch, which is a kind of circuit breaker, is a kind of switch that can be automatically opened whenever the current in the circuit exceeds the rated current or there is a leakage phenomenon, and is a very important electric appliance in low-voltage distribution network and electric traction system. The traditional air switch adopts a mechanical structure to control tripping, and only the air switch with a leakage current reaching a certain degree can realize tripping. If a certain leakage current exists in the circuit and the amplitude is smaller than the rated current of the air switch, the protection method can have a leakage action dead zone, a leakage signal can not be detected correctly, the leakage phenomenon can exist in the circuit for a long time and is not easy to detect, the aging process of equipment and cables can be aggravated over time, and great potential safety hazards are caused.
Disclosure of Invention
The utility model provides an air switch remote monitoring system, which solves the problem that an air switch in the prior art cannot eliminate a dead zone of leakage action.
The technical scheme of the utility model is as follows:
the air switch remote monitoring system comprises a main control unit, a wireless communication unit, a leakage detection circuit and a tripping control circuit, wherein the leakage detection circuit and the tripping control circuit are both connected with the main control unit, and the main control unit is in communication connection with an upper computer by means of the wireless communication unit;
the leakage detection circuit comprises a current transformer, a resistor R1, a resistor R2, a resistor R3, an operational amplifier U1, a diode D1, a resistor R4, a resistor R5, an operational amplifier U2, a resistor R6, a resistor R7 and a resistor R8,
the first end of resistance R2 connects current transformer coil L1's first end, the second end of resistance R2 is connected the inverting input of fortune is put U1, current transformer coil L1's second end ground connection, the first end of resistance R1 is connected the first end of resistance R2, the second end ground connection of resistance R1, fortune is put U1's homophase input and is passed through resistance R3 ground connection, fortune is put U1's output and is connected diode D1's positive pole, diode D1's negative pole is passed through resistance R4 is connected fortune is put U2's homophase input, fortune is put U2's homophase input and is passed through resistance R5 is connected the second end of resistance R2, fortune is put U2's inverting input and is passed through resistance R6 ground connection, fortune is put U2's output and is passed through resistance R7 is connected fortune is put U2's inverting input, fortune is put U2's output and is passed through resistance R8 is connected the master control unit.
Further, the trip control circuit in the utility model comprises a resistor R9, an optocoupler U3, a resistor R10, a triode Q1 and a triode Q2, wherein a first input end of the optocoupler U3 is connected with a 5V power supply, a second input end of the optocoupler U3 is connected with the main control unit through the resistor R9, a first output end of the optocoupler U3 is connected with the 5V power supply, a second output end of the optocoupler U3 is connected with a base electrode of the triode Q1 through the resistor R10, an emitter electrode of the triode Q1 is connected with a base electrode of the triode Q2, a collector electrode of the triode Q1 is connected with a collector electrode of the triode Q2, a collector electrode of the triode Q2 is connected with a first end of an energizing coil of an air switch executing mechanism, a second end of the energizing coil of the air switch executing mechanism is connected with a VCC power supply, and an emitter electrode of the triode Q2 is grounded.
Further, the trip control circuit in the utility model further comprises a reset switch S1, a diode D2 and a resistor R11, wherein a first end of the reset switch S1 is connected with a VCC power supply, a second end of the reset switch S1 is connected with an anode of the diode D3, and a cathode of the diode D3 is connected with a base electrode of the triode Q1 through the resistor R11.
Further, the utility model also comprises an overvoltage detection circuit, wherein the overvoltage detection circuit comprises branches with the same three circuit structures, any branch comprises a resistor R15, an operational amplifier U4, a diode D4, a resistor R18, a resistor R21 and a diode D7, the inverting input end of the operational amplifier U4 is used for being connected with an A phase line, the non-inverting input end of the operational amplifier U4 is used for being connected with a zero line, the output end of the operational amplifier U4 is connected with the inverting input end of the operational amplifier U4 through the resistor R15, the output end of the operational amplifier U4 is connected with the anode of the diode D4, the cathode of the diode D4 is connected with the first end of the resistor R18, the second end of the resistor R18 is connected with the anode of the diode D7, the first end of the resistor R21 is connected with the second end of the resistor R18, and the cathode of the diode D7 is connected with the main control unit.
Further, the utility model also comprises an undervoltage detection circuit, wherein the undervoltage detection circuit comprises three branches with the same circuit structure, any branch comprises an operational amplifier U7, a resistor 24 and a diode D10, the inverting input end of the operational amplifier U7 is connected with the second end of the resistor R18, the non-inverting input end of the operational amplifier U7 is connected with a Vref reference power supply, the output end of the operational amplifier U7 is connected with the anode of the diode D10 through the resistor R24, and the cathode of the diode D10 is connected with the main control unit.
The working principle and the beneficial effects of the utility model are as follows:
in the utility model, the leakage detection circuit is used for detecting the leakage fault in real time, and the leakage current is also called residual current. When the electric leakage detection circuit detects an electric leakage signal, the electric leakage signal is converted into a voltage signal and is sent to the main control unit, the main control unit sends an instruction to the tripping control circuit when receiving the signal, the tripping control circuit enables the actuating mechanism of the air switch to act after receiving the instruction of the main control unit, and the connection between the power grid and the electric equipment is cut off so as to avoid potential safety hazards. Meanwhile, when an electric leakage signal occurs, the main control unit sends an alarm signal to the upper computer through the wireless communication unit, and the upper computer can be a computer or handheld mobile communication equipment, so that relevant staff can timely make corresponding solving measures after receiving the alarm signal, and the electric leakage fault is eliminated, and the problem that the dead zone of the electric leakage action cannot be eliminated by the traditional air switch is solved.
Specifically, the operating principle of the leakage detection circuit is as follows: the current transformer is used for detecting the residual current in the power grid, wherein the residual current refers to the vector sum of all currents through a line, a phase line of the power grid passes through the current transformer, and under normal conditions, the vector sum of the currents in the line is zero. When the line is subjected to human body electric shock or electric equipment electric leakage fault, current can flow into the ground through human body or grounding electric current, so that the current vector sum of the primary side of the current transformer is not zero, and therefore, the secondary side of the current transformer generates induction current.
When residual current exists in the electric equipment, the current transformer can induce a current signal, the current signal is converted into a voltage signal through the resistor R1, high-frequency spike pulse possibly exists in alternating current, so that high-frequency impurity signals are filtered through the capacitor C1, and finally the voltage signal is sent to the inverting input end of the operational amplifier U1 through the resistor R2. When the input signal is in the normal phase, the operational amplifier U1 amplifies the input signal in the reverse phase, and since the diode D1 is cut off in the reverse phase, no current flows through the output end of the operational amplifier U1, and in addition, according to the virtual short principle of the operational amplifier U1, the current passing through the resistor R5 is 0, so that the input and output voltages of the operational amplifier U1 are equal, namely, the operational amplifier U1 forms a voltage follower at the moment, the operational amplifier U2 forms an amplifying circuit, and the voltage signal is amplified by the operational amplifier U2 and then is sent to the main control unit. When the signal input into the operational amplifier U1 is in reverse phase, the positive voltage signal is output after the operational amplifier U1 is in reverse phase amplification, at the moment, the diode D1 is conducted in normal phase, and the resistance value of the resistor R2 is equal to that of the resistor R5, so that the operational amplifier U1 is equivalent to the equal proportion reverse phase of the input signal, namely the operational amplifier U1 forms a rectifying circuit at the moment, and then the electric signal after the reverse phase is amplified by the operational amplifier U2 and then is sent to the main control unit.
In the utility model, the current transformer adopts the electromagnetic type residual current transformer, and compared with the detection of the Hall type transformer and the detection of the magnetic modulation type transformer, the electromagnetic type residual current transformer can detect the residual current of a sine alternating current type and has the characteristics of high precision and quick response.
The utility model will be described in further detail with reference to the drawings and the detailed description.
Drawings
FIG. 1 is a circuit diagram of a leakage detection circuit according to the present utility model;
FIG. 2 is a circuit diagram of a trip control circuit according to the present utility model;
FIG. 3 is a circuit diagram of an overvoltage detection circuit according to the present utility model;
FIG. 4 is a circuit diagram of the brown-out detection circuit of the present utility model.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
As shown in fig. 1, the embodiment provides an air switch remote monitoring system, which comprises a main control unit, a wireless communication unit, a leakage detection circuit and a tripping control circuit, wherein the leakage detection circuit and the tripping control circuit are both connected with the main control unit, and the main control unit is in communication connection with an upper computer by means of the wireless communication unit; the leakage detection circuit comprises a current transformer, a resistor R1, a resistor R2, a resistor R3, an operational amplifier U1, a diode D1, a resistor R4, a resistor R5, an operational amplifier U2, a resistor R6, a resistor R7 and a resistor R8, wherein the first end of the resistor R2 is connected with the first end of the current transformer coil L1, the second end of the resistor R2 is connected with the inverting input end of the operational amplifier U1, the second end of the current transformer coil L1 is grounded, the first end of the resistor R1 is connected with the first end of the resistor R2, the second end of the resistor R1 is grounded, the non-inverting input end of the operational amplifier U1 is connected with the anode of the diode D1 through the resistor R3, the cathode of the diode D1 is connected with the non-inverting input end of the operational amplifier U2 through the resistor R5, the inverting input end of the operational amplifier U2 is grounded through the resistor R6, the output end of the operational amplifier U2 is connected with the inverting input end of the operational amplifier U2 through the resistor R7, and the output end of the operational amplifier U2 is connected with the master control unit through the resistor R8.
The air switch is connected to a low-voltage distribution network, namely between the power grid and the electric equipment, so that the protection effect is achieved. When the insulating surface layer of the electric equipment is contacted with the live wire due to aging, damage and the like, the risk of electric leakage exists, if a human body contacts the surface of the electric equipment, partial current on the live wire flows to the ground from the human body, so that the current on the live wire is unequal to the current flowing out of the zero line, and the electric leakage current is generated at the moment.
The leakage detection circuit is used for detecting leakage faults in real time, and leakage current is also called residual current. When the electric leakage detection circuit detects an electric leakage signal, the electric leakage signal is converted into a voltage signal and is sent to the main control unit, the main control unit sends an instruction to the tripping control circuit when receiving the signal, the tripping control circuit enables the actuating mechanism of the air switch to act after receiving the instruction of the main control unit, and the connection between the power grid and the electric equipment is cut off so as to avoid potential safety hazards. Meanwhile, when an electric leakage signal occurs, the main control unit sends an alarm signal to the upper computer through the wireless communication unit, and the upper computer can be a computer or handheld mobile communication equipment, so that relevant staff can timely make corresponding solving measures after receiving the alarm signal, and the electric leakage fault is eliminated, and the problem that the dead zone of the electric leakage action cannot be eliminated by the traditional air switch is solved.
Specifically, the operating principle of the leakage detection circuit is as follows: the current transformer is used for detecting the residual current in the power grid, wherein the residual current refers to the vector sum of all currents through a line, a phase line of the power grid passes through the current transformer, and under normal conditions, the vector sum of the currents in the line is zero. When the line is subjected to human body electric shock or electric equipment electric leakage fault, current can flow into the ground through human body or grounding electric current, so that the current vector sum of the primary side of the current transformer is not zero, and therefore, the secondary side of the current transformer generates induction current.
When residual current exists in the electric equipment, the current transformer can induce a current signal, the current signal is converted into a voltage signal through the resistor R1, high-frequency spike pulse possibly exists in alternating current, so that high-frequency impurity signals are filtered through the capacitor C1, and finally the voltage signal is sent to the inverting input end of the operational amplifier U1 through the resistor R2. When the input signal is in the normal phase, the operational amplifier U1 amplifies the input signal in the reverse phase, and since the diode D1 is cut off in the reverse phase, no current flows through the output end of the operational amplifier U1, and in addition, according to the virtual short principle of the operational amplifier U1, the current passing through the resistor R5 is 0, so that the input and output voltages of the operational amplifier U1 are equal, namely, the operational amplifier U1 forms a voltage follower at the moment, the operational amplifier U2 forms an amplifying circuit, and the voltage signal is amplified by the operational amplifier U2 and then is sent to the main control unit. When the signal input into the operational amplifier U1 is in reverse phase, the positive voltage signal is output after the operational amplifier U1 is in reverse phase amplification, at the moment, the diode D1 is conducted in normal phase, and the resistance value of the resistor R2 is equal to that of the resistor R5, so that the operational amplifier U1 is equivalent to the equal proportion reverse phase of the input signal, namely the operational amplifier U1 forms a rectifying circuit at the moment, and then the electric signal after the reverse phase is amplified by the operational amplifier U2 and then is sent to the main control unit.
In the embodiment, the current transformer adopts an electromagnetic type residual current transformer, and compared with the detection of the Hall type transformer and the detection of the magnetic modulation type transformer, the electromagnetic type residual current transformer can detect the residual current of a sine alternating current type, and has the characteristics of high precision and quick response.
As shown in fig. 2, the trip control circuit in this embodiment includes a resistor R9, an optocoupler U3, a resistor R10, a triode Q1 and a triode Q2, where a first input end of the optocoupler U3 is connected to a 5V power supply, a second input end of the optocoupler U3 is connected to a main control unit through the resistor R9, a first output end of the optocoupler U3 is connected to the 5V power supply, a second output end of the optocoupler U3 is connected to a base electrode of the triode Q1 through the resistor R10, an emitter of the triode Q1 is connected to a base electrode of the triode Q2, a collector of the triode Q1 is connected to a collector of the triode Q2, a collector of the triode Q2 is connected to a first end of an air switch executing mechanism power-on coil, a second end of the air switch executing mechanism power-on coil is connected to a VCC power supply, and an emitter of the triode Q2 is grounded.
The protection function of the air switch is finally realized by the tripping control circuit to control the tripping of the actuating mechanism. When the electric leakage fault occurs, the main control unit outputs a tripping action signal, and the air switch is tripped to disconnect the power grid and the electric equipment through the tripping control circuit, so that the current is cut off.
In this embodiment, the actuating mechanism of the air switch is electromagnetic trigger. When the power grid line or the electric equipment is normal, the second input end of the optical coupler U3 is a high-level signal, the optical coupler U3 is cut off, when the residual current is detected by the electric leakage detection circuit, and the current exceeds a set value, the main control unit outputs a low-level signal to the second input end of the optical coupler U3, the optical coupler U3 is conducted at the moment, the second output end of the optical coupler U3 outputs a high-level signal to the base electrode of the triode Q1, the triode Q1 and the triode Q2 are conducted at the same time, the coil of the air switch executing mechanism is electrified, the executing mechanism acts, and the connection between the power grid and the electric equipment is disconnected.
The resistor R9 and the capacitor C2 form a low-pass filter circuit, so that the jitter interference level is effectively avoided. The optocoupler U3 isolates the main control unit from the high-voltage level, so that the high-voltage level is prevented from breakdown of the main control unit, and the effect of preventing signal interference is achieved. The diode D2 plays a protective role.
As shown in fig. 2, the trip control circuit in this embodiment further includes a reset switch S1, a diode D2, and a resistor R11, where a first end of the reset switch S1 is connected to the VCC power supply, a second end of the reset switch S1 is connected to an anode of the diode D3, and a cathode of the diode D3 is connected to a base of the triode Q1 through the resistor R11.
In this embodiment, a manual trip action circuit part is further provided, when the reset switch S1 is pressed, the base of the triode Q1 is at a high level, so that the triode Q1 and the triode Q2 are simultaneously turned on, so that the actuator acts to effectively supplement the control of the main control unit, and the circuit is conveniently manually cut off when in emergency or when needed.
As shown in fig. 3, the embodiment further includes an overvoltage detection circuit, where the overvoltage detection circuit includes three branches with the same circuit structure, and any branch includes a resistor R12, a resistor R15, an operational amplifier U4, a diode D4, a resistor R18, a resistor R21, and a diode D7, where an inverting input end of the operational amplifier U4 is connected to the a-phase line through the resistor R12, an non-inverting input end of the operational amplifier U4 is connected to the zero line, an output end of the operational amplifier U4 is connected to the inverting input end of the operational amplifier U4 through the resistor R15, an output end of the operational amplifier U4 is connected to an anode of the diode D4, a cathode of the diode D4 is connected to a first end of the resistor R18, a second end of the resistor R18 is connected to an anode of the diode D7, and a first end of the resistor R21 is connected to a second end of the resistor R18, and a cathode of the diode D7 is connected to the master control unit.
When the power supply voltage of the electric equipment is unstable, the ageing of the electric equipment is accelerated. If the power supply is too high, the electric equipment can be damaged, and therefore, the method is also very important for detecting the voltage of the power grid.
In this embodiment, the overvoltage detection circuit detects the phase voltage of the power grid in real time, and sends the detection result to the main control unit, and when any phase voltage exceeds the normal range, the main control unit sends a tripping instruction.
The overvoltage detection circuit comprises three branches with the same circuit structure, and respectively corresponds to three-phase electricity in a power grid, a phase A electricity is taken as an example, a voltage transformer is arranged in the phase A, the output of the voltage transformer is connected with the inverting input end of the operational amplifier U4, the non-inverting input end of the operational amplifier U4 is connected with a zero line, UA in fig. 3 is an alternating-current voltage signal obtained after the voltage of the phase A electricity of the power grid is reduced by the voltage transformer, the operational amplifier U4 forms an inverting amplification circuit, when UA is in a positive half cycle, a negative voltage value is output after the inverting amplification of the operational amplifier U4, and the diode D4 is cut off; when UA is in the negative half cycle, the positive voltage value is output after the reverse phase amplification of the operational amplifier U4, the diode D4 is conducted, and the voltage value is added to the main control unit after the voltage is divided by the resistor R18 and the resistor R21. When the voltage signal received by the main control unit exceeds a set value, the main control unit sends a control instruction to the tripping control circuit. The capacitor C3 plays a role in filtering, and high-frequency clutter in the output voltage signal of the operational amplifier U4 is filtered.
The principle of detecting the overvoltage of B phase electricity and C phase electricity is the same as that of A phase electricity, and is described in detail herein.
As shown in fig. 4, the embodiment further includes an undervoltage detection circuit, where the undervoltage detection circuit includes three branches with the same circuit structure, and any branch includes an operational amplifier U7, a resistor 24, and a diode D10, where an inverting input end of the operational amplifier U7 is connected to a second end of the resistor R18, an non-inverting input end of the operational amplifier U7 is connected to a Vref reference power supply, an output end of the operational amplifier U7 is connected to an anode of the diode D10 through the resistor R24, and a cathode of the diode D10 is connected to a main control unit.
The overvoltage will damage the electric equipment, and the undervoltage will also damage the electric equipment. Therefore, an undervoltage detection circuit is added in this embodiment. The undervoltage detection circuit also comprises three branches, the circuit structures of the three branches are the same, taking A-phase electricity as an example, the voltage divided by the resistor RR18 and the resistor R21 is added to the inverting input end of the operational amplifier U7, the non-inverting input end of the operational amplifier U7 is connected with Vref reference voltage, when the power grid voltage is normal, the operational amplifier U7 outputs low level, and the diode D10 is cut off. When the power grid voltage is lower than the set Vref reference voltage, the operational amplifier U7 outputs a high-level signal, the diode D10 is conducted at the moment, the output high-level signal is added to the main control unit through the diode D10, when the main control unit receives the high-level signal, the power grid voltage is indicated to be in an under-voltage state, and the main control unit sends a control instruction to the tripping control circuit.
The capacitor C6 plays a role in filtering, and high-frequency clutter in the output voltage signal of the operational amplifier U7 is filtered.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (5)
1. The air switch remote monitoring system is characterized by comprising a main control unit, a wireless communication unit, a leakage detection circuit and a tripping control circuit, wherein the leakage detection circuit and the tripping control circuit are both connected with the main control unit, and the main control unit is in communication connection with an upper computer by means of the wireless communication unit;
the leakage detection circuit comprises a current transformer, a resistor R1, a resistor R2, a resistor R3, an operational amplifier U1, a diode D1, a resistor R4, a resistor R5, an operational amplifier U2, a resistor R6, a resistor R7 and a resistor R8,
the first end of resistance R2 connects current transformer coil L1's first end, the second end of resistance R2 is connected the inverting input of fortune is put U1, current transformer coil L1's second end ground connection, the first end of resistance R1 is connected the first end of resistance R2, the second end ground connection of resistance R1, fortune is put U1's homophase input and is passed through resistance R3 ground connection, fortune is put U1's output and is connected diode D1's positive pole, diode D1's negative pole is passed through resistance R4 is connected fortune is put U2's homophase input, fortune is put U2's homophase input and is passed through resistance R5 is connected the second end of resistance R2, fortune is put U2's inverting input and is passed through resistance R6 ground connection, fortune is put U2's output and is passed through resistance R7 is connected fortune is put U2's inverting input, fortune is put U2's output and is passed through resistance R8 is connected the master control unit.
2. The air switch remote monitoring system according to claim 1, wherein the trip control circuit comprises a resistor R9, an optocoupler U3, a resistor R10, a triode Q1 and a triode Q2, wherein a first input end of the optocoupler U3 is connected with a 5V power supply, a second input end of the optocoupler U3 is connected with the main control unit through the resistor R9, a first output end of the optocoupler U3 is connected with a 5V power supply, a second output end of the optocoupler U3 is connected with a base electrode of the triode Q1 through the resistor R10, an emitter electrode of the triode Q1 is connected with a base electrode of the triode Q2, a collector electrode of the triode Q1 is connected with a collector electrode of the triode Q2, a collector electrode of the triode Q2 is connected with a first end of an air switch executing mechanism power coil, a second end of the air switch executing mechanism power coil is connected with a VCC power supply, and an emitter electrode of the triode Q2 is grounded.
3. The air switch remote monitoring system according to claim 2, wherein the trip control circuit further comprises a reset switch S1, a diode D2 and a resistor R11, wherein a first end of the reset switch S1 is connected to a VCC power supply, a second end of the reset switch S1 is connected to an anode of the diode D3, and a cathode of the diode D3 is connected to a base of the triode Q1 through the resistor R11.
4. The air switch remote monitoring system according to claim 1, further comprising an overvoltage detection circuit, wherein the overvoltage detection circuit comprises three branches with the same circuit structure, any one branch comprises a resistor R15, an operational amplifier U4, a diode D4, a resistor R18, a resistor R21 and a diode D7, an inverting input end of the operational amplifier U4 is used for connecting an a-phase line, a non-inverting input end of the operational amplifier U4 is used for connecting a zero line, an output end of the operational amplifier U4 is connected with the inverting input end of the operational amplifier U4 through the resistor R15, an output end of the operational amplifier U4 is connected with an anode of the diode D4, a cathode of the diode D4 is connected with a first end of the resistor R18, a second end of the resistor R18 is connected with an anode of the diode D7, a first end of the resistor R21 is connected with a second end of the resistor R18, and a cathode of the diode D7 is connected with the master control unit.
5. The air switch remote monitoring system according to claim 4, further comprising an undervoltage detection circuit, wherein the undervoltage detection circuit comprises three branches with the same circuit structure, any one branch comprises an operational amplifier U7, a resistor 24 and a diode D10, an inverting input end of the operational amplifier U7 is connected with a second end of the resistor R18, a non-inverting input end of the operational amplifier U7 is connected with a Vref reference power supply, an output end of the operational amplifier U7 is connected with an anode of the diode D10 through the resistor R24, and a cathode of the diode D10 is connected with the master control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223150339.9U CN218940773U (en) | 2022-11-23 | 2022-11-23 | Air switch remote monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223150339.9U CN218940773U (en) | 2022-11-23 | 2022-11-23 | Air switch remote monitoring system |
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| CN218940773U true CN218940773U (en) | 2023-04-28 |
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| CN202223150339.9U Active CN218940773U (en) | 2022-11-23 | 2022-11-23 | Air switch remote monitoring system |
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