CN110649580A - Intelligent control system of circuit breaker - Google Patents
Intelligent control system of circuit breaker Download PDFInfo
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- CN110649580A CN110649580A CN201910971558.7A CN201910971558A CN110649580A CN 110649580 A CN110649580 A CN 110649580A CN 201910971558 A CN201910971558 A CN 201910971558A CN 110649580 A CN110649580 A CN 110649580A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
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Abstract
The invention provides an intelligent control system of a circuit breaker, wherein the circuit breaker is connected in a three-phase system, and the intelligent control system comprises a signal acquisition module, a signal processing module and a control output module; the signal acquisition module is connected with the signal processing module; the signal processing module is connected with the control output module; the signal acquisition module comprises a voltage acquisition circuit and a current acquisition circuit; the signal processing module comprises an A/D converter, and the voltage acquisition circuit and the current acquisition circuit are connected to the A/D converter through the phase selection circuit; the control output module comprises a singlechip and a control output circuit; the A/D converter is connected with the single chip microcomputer, and the single chip microcomputer is also connected with the control output circuit; the control output circuit is also connected with the output end of the current acquisition circuit; the control output circuit is connected to the circuit breaker and used for controlling the circuit breaker.
Description
Technical Field
The invention relates to the technical field of intelligent control of circuit breakers, in particular to an intelligent control system of a circuit breaker.
Background
As demand for electricity increases, demand for quality of electrical energy increases. In recent years, the power system and power equipment industries in China have been greatly developed. With the rapid development of information technology, switching appliances have also undergone a new round of upgrade. With the development of national intelligent power grid construction, the intelligent universal circuit breaker is widely applied to a low-voltage power supply and distribution system as a main protection switch. The intelligent circuit breaker is of two types, universal type and plastic shell type. The intelligent universal circuit breaker is suitable for alternating current 50Hz, rated voltage 380V (660V) and rated current of 200A-6300A in a power distribution network. Has its own advantages compared to circuit breakers of conventional circuit breakers. The protection circuit has multiple protection functions, long time delay, instant protection, short time delay and fault (including sequence current and residual current protection) protection, realizes overload protection, short-circuit time delay protection, large short-circuit instant action current protection and ground fault protection respectively, has high protection sensitivity, is easy to adjust various parameters, and meets the requirement of distributed line protection easily. In addition, it has the function of grading protection and has better performance of selective action.
Along with the improvement of system voltage level and transmission and transfer capacitance, transmission lines are continuously increased, each line is correspondingly provided with a circuit breaker, and how to design the circuit breaker to carry out intelligent control without influencing the disconnection of equipment fault lines is a problem to be solved urgently in the field.
Disclosure of Invention
Along with the improvement of system voltage level and transmission and transfer capacitance, transmission lines are continuously increased, each line is correspondingly provided with a circuit breaker, and the problem to be solved in the field is solved aiming at how to design the circuit breaker to carry out intelligent control without influencing the disconnection of equipment fault lines. The invention provides an intelligent control system of a circuit breaker.
The technical scheme of the invention is as follows:
the technical scheme of the invention provides an intelligent control system of a circuit breaker, wherein the circuit breaker is connected in a three-phase system, and the intelligent control system comprises a signal acquisition module, a signal processing module and a control output module; the signal acquisition module is connected with the signal processing module; the signal processing module is connected with the control output module;
the signal acquisition module comprises a voltage acquisition circuit and a current acquisition circuit; the voltage acquisition circuit and the current acquisition circuit are connected to the signal processing module through the phase selection circuit;
the signal processing module comprises an A/D converter, and the voltage acquisition circuit and the current acquisition circuit are connected to the A/D converter through the phase selection circuit;
the control output module comprises a singlechip and a control output circuit; the A/D converter is connected with the single chip microcomputer, and the single chip microcomputer is also connected with the control output circuit; the control output circuit is also connected with the output end of the current acquisition circuit; the control output circuit is connected to the circuit breaker and used for controlling the circuit breaker.
Preferably, the voltage acquisition circuit comprises voltage-controlled oscillators, the voltage-controlled oscillators are arranged in a three-phase system, the input end of each voltage-controlled oscillator is connected with a phase voltage of a corresponding phase, the output end of each voltage-controlled oscillator is connected with a voltage comparator through a voltage-reducing resistor, and the output end of each voltage comparator is connected to the a/D converter through a phase selection circuit;
the current acquisition circuit comprises current sensors, each phase in the three-phase system is connected with one current sensor in series, the signal output end of each current sensor is connected with one voltage comparator, and the output end of each voltage comparator is connected to the A/D converter through a phase selection circuit.
Preferably, the system further comprises a power supply module, the power supply module comprises a power supply conversion module, an input end of the power supply conversion module is connected to external alternating current, and an output end of the power supply conversion module comprises a 24v power supply, a VCC-1 power supply and a VCC-2 power supply.
Preferably, the control output circuit comprises a signal processing control circuit, and the signal processing control circuit comprises an address latch, a first nand gate and a second nand gate;
the input end of the first NAND gate and the input end of the second NAND gate are both connected to the output end of the single chip microcomputer; the output end of the first NAND gate and the output end of the second NAND gate are respectively connected to the A/D converter;
the address latch is respectively connected with the A/D converter and the singlechip.
Preferably, the control output circuit comprises an action control circuit, the action control circuit comprises comparators and a magnetic flux converter, the output end of each corresponding current acquisition circuit in the three-phase system is connected with the negative input end of one comparator, and the positive input end of each comparator is respectively connected with the single chip microcomputer; the output ends of the comparators are connected with a monostable trigger through a pulse width detection circuit and used for controlling output of a trigger signal to enable the monostable trigger to output pulses with certain width and enable the magnetic flux converter to be opened through a driving circuit so as to break the circuit breaker.
Preferably, the driving circuit comprises a first triode and a second triode; the base electrode of the first triode is connected to the output end of the monostable trigger, the collector electrode of the first triode is connected with the anode of the first diode, the cathode of the first diode is connected with the cathode of the second diode, and the anode of the second diode is connected with a 24v power supply; the magnetic flux converter is connected in parallel at two ends of the first diode; the collector of the second triode is connected with the collector of the first triode, and the base of the second triode is connected with the emitter of the first triode; the emitting electrode of the first triode is grounded through the first resistor, and the emitting electrode of the second triode is grounded.
Preferably, the control output circuit further comprises a display control circuit, wherein the display control circuit comprises a keyboard and display interface chip, a decoder, a keyboard, a first buffer and a second buffer; the keyboard is connected with the display interface chip; the display interface chip is connected with the first buffer through the decoder; the display interface chip is connected with the second buffer; the keyboard is also connected with the output end of the decoder;
the single chip microcomputer is connected with the display interface chip through a keyboard.
Preferably, the system also comprises an alarm circuit, wherein the alarm circuit is connected with the singlechip;
the alarm circuit comprises a current alarm indicator lamp and a voltage alarm indicator lamp, and the current alarm indicator lamp and the voltage alarm indicator lamp are respectively connected with the single chip microcomputer.
Preferably, the control output circuit further comprises an RS232 interface circuit, the RS232 interface circuit comprises a level conversion chip and a driver, the level conversion chip is connected with the driver, and the level conversion chip is connected with the single chip microcomputer.
Preferably, the system further comprises an upper computer, wherein the single chip microcomputer is connected with the upper computer and used for transmitting the requirement recorded by the upper computer according to the on-off of the circuit breaker and transmitting the parameter configuration information to the upper computer through an operation command and protection.
According to the technical scheme, the invention has the following advantages: according to the basic principle of the intelligent circuit breaker, an intelligent control system is designed, the operation reliability of the intelligent circuit breaker is improved, the service life of the circuit breaker is prolonged, and the intelligent circuit breaker has higher economic benefit undoubtedly. Practical operating experience and design have shown that the circuit breaker motion characteristics have a significant effect on its performance, so that the performance of the circuit breaker can be modified by adjusting the circuit breaker motion characteristics.
(1) And automatically identifying the working state of the circuit breaker: the accurate identification of the working state of the circuit breaker is the premise of realizing intelligent operation. Overcurrent, small capacitive current and small inductive current.
(2) Automatic adjustment circuit breaker's operating device: this is the core function of the control unit. The operating state of the circuit breaker identified by the control unit must therefore be adjusted accordingly on the basis of the specific operating regime.
(3) Recording and displaying the working state of the circuit breaker: since the circuit breaker is not active for most of the operating time. During this period, the operating state of the circuit breaker is constantly monitored, and at the same time, information about each time the circuit breaker is closed is also recorded. The short circuit also records the change process of the short circuit current so as to be convenient for accident analysis and the maintenance of the power department of the circuit breaker, and the corrosion condition of the contact of the circuit breaker is represented by the accumulated breaking current of the circuit breaker.
(4) Having communication capability with a remote host: the control system can transmit the requirement recorded by the PC according to the on-off of the breaker of the host computer, and the control system and the PC can transmit the parameter configuration information through operation commands and protection.
In addition, the invention has reliable design principle, simple structure and very wide application prospect.
Therefore, compared with the prior art, the invention has prominent substantive features and remarkable progress, and the beneficial effects of the implementation are also obvious.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a connection block diagram of an intelligent control system of a circuit breaker according to the present invention.
Fig. 2 is a schematic connection diagram of a voltage acquisition circuit according to an embodiment of the present invention.
Fig. 3 is a schematic connection diagram of a current collecting circuit according to an embodiment of the present invention.
Fig. 4 is a schematic connection diagram of an operation control circuit according to an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Those skilled in the art know that closing and opening of the circuit breaker is accomplished by a mechanism. The mechanism comprises a transmission mechanism, a free tripping mechanism, a main shaft, a tripping shaft and the like. The transmission mechanism of the circuit breaker can be divided into five types, namely handle transmission, lever transmission, electromagnet transmission, motor transmission and pneumatic or hydraulic transmission.
An energy storage mechanism: the energy storage device adopts a spring to store energy and consists of an energy storage spring, a cam, an energy storage lever, a buckle plate and a half shaft. When the semi-axle of the buckle is buckled, the cam is driven by electricity or hand to rotate clockwise to push the roller on the energy storage lever, so that the energy storage lever also rotates clockwise, and the lower end of the energy storage lever moves leftwards to compress the energy storage spring. The purpose of energy storage is achieved.
The free tripping mechanism realizes the connection between the transmission mechanism and the contact system. When the free tripping mechanism is buckled again, the transmission mechanism drives the contact system to move in unison and the contacts are closed. Generally, the free tripping mechanism is divided into an automatic rebutting mechanism and a non-automatic rebutting mechanism. The free tripping mechanism of the automatic re-buckling is re-buckled by the weight of the handle or under the action of a return spring. Conventional circuit breakers employ a trip free mechanism of this type. A free tripping mechanism which is buckled with a plurality of parts can reset under the weight of the receiving handle. The disadvantage is that there is no effort-saving effect and therefore the closing operating force is large. In order to eliminate the defect, a four-link to five-link free tripping mechanism is mostly adopted, and after the mechanism is closed, one fulcrum is eliminated, so that free tripping is realized.
The motor and handle operating mechanism adopts a direct current series excitation motor as a power source, and the high-speed motor drives a cam on a main shaft to rotate to work after speed change of a gear and a planet wheel. When the energy storage is finished, the micro switch acts to cut off the power supply of the motor, and the motor stops. When manual energy storage is carried out, the energy storage handle can drive the main shaft to rotate, but other parts cannot rotate. The energy storage operation is generally completed by 7 times of reciprocating of the handle. The motor operating mechanism is a set of system, the energy storage shaft is movably connected with the main shaft through a concave-convex wedge opening, and the assembly and the disassembly are very convenient.
Example one
The technical scheme of the invention provides an intelligent control system of a circuit breaker, wherein the circuit breaker is connected in a three-phase system, the circuit breaker is an intelligent universal circuit breaker, and the intelligent control system comprises a signal acquisition module, a signal processing module and a control output module; the signal acquisition module is connected with the signal processing module; the signal processing module is connected with the control output module;
the signal acquisition module comprises a voltage acquisition circuit and a current acquisition circuit; the voltage acquisition circuit and the current acquisition circuit are connected to the signal processing module through the phase selection circuit;
the signal processing module comprises an A/D converter, and the voltage acquisition circuit and the current acquisition circuit are connected to the A/D converter through the phase selection circuit;
the control output module comprises a singlechip and a control output circuit; the A/D converter is connected with the single chip microcomputer, and the single chip microcomputer is also connected with the control output circuit; the control output circuit is also connected with the output end of the current acquisition circuit; the control output circuit is connected to the circuit breaker and used for controlling the circuit breaker.
Example two
The technical scheme of the invention provides an intelligent control system of a circuit breaker, wherein the circuit breaker is connected in a three-phase system, and the intelligent control system comprises a signal acquisition module, a signal processing module and a control output module; the signal acquisition module is connected with the signal processing module; the signal processing module is connected with the control output module;
the signal acquisition module comprises a voltage acquisition circuit and a current acquisition circuit; the voltage acquisition circuit and the current acquisition circuit are connected to the signal processing module through the phase selection circuit; the phase selection circuit described in this embodiment includes a differential 4-channel digitally controlled analog switch of the type CD 4052.
The signal processing module comprises an A/D converter, and the voltage acquisition circuit and the current acquisition circuit are connected to the A/D converter through the phase selection circuit; in the present embodiment, an AD0809 converter is used as the a/D converter.
The control output module comprises a singlechip and a control output circuit; the A/D converter is connected with the single chip microcomputer, and the single chip microcomputer is also connected with the control output circuit; the control output circuit is also connected with the output end of the current acquisition circuit; the control output circuit is connected to the circuit breaker and used for controlling the circuit breaker.
It should be noted that, the system in this embodiment further includes a power supply module, where the power supply module includes a power supply conversion module, an input end of the power supply conversion module is connected to an external alternating current, and an output end of the power supply conversion module includes a 24v power supply, a VCC-1 power supply, and a VCC-2 power supply.
The voltage acquisition circuit comprises voltage-controlled oscillators 101, the voltage-controlled oscillators 101 are arranged in a three-phase system, the input end of each voltage-controlled oscillator 101 is connected with a phase voltage of a corresponding phase, the output end of each voltage-controlled oscillator 101 is connected with a voltage comparator through a voltage reduction resistor, and the output end of each voltage comparator is connected to the A/D converter through a phase selection circuit; in this embodiment, in a three-phase system, the voltage acquisition circuits for each phase are the same, as shown in fig. 2, the input end of the voltage-controlled oscillator 101 is connected to the phase voltage of the corresponding phase, the output end of the voltage-controlled oscillator 101 is connected to the positive input end of the voltage comparator U11 through a resistor R5, and the negative input end of the voltage comparator U11 is grounded through a resistor R6; a diode D3 and a diode D4 are connected in parallel to two input ends of the voltage comparator U11, wherein the directions of the diode D3 and the diode D4 are opposite; the output terminal of the voltage comparator U11 is connected to the a/D converter through a phase selection circuit. In this embodiment, the voltage-controlled oscillator is a frequency modulator with a model 74LS 324.
The current acquisition circuit comprises a current sensor U10, each phase in the three-phase system is connected with a current sensor in series, the signal output end of each current sensor is connected with a voltage comparator, and the output end of each voltage comparator is connected to the A/D converter through a phase selection circuit. In this embodiment, in a three-phase system, the current acquisition circuits for each phase are the same, as shown in fig. 3, the current sensors are connected in series in a circuit, the signal output terminal of the current sensor U10 is connected to the negative input terminal of the voltage comparator U9 through the resistor R2, and the VCC-2 power supply is grounded through the resistor R1 and the resistor R3 which are connected in series; the positive input end of the voltage comparator U9 is connected to the connection point of the resistor R1 and the resistor R3; the power supply end of the current sensor U10 is connected to a VCC-1 power supply, and the power supply end of the current sensor U10 is also grounded through a capacitor C1; the output end of the voltage comparator U9 is also connected to the negative input end of the voltage comparator U9 through a resistor R4 and a capacitor C3 which are connected in parallel; the output end of the voltage transformer U9 is connected to the A/D converter through a phase selection circuit. In this embodiment, the current sensor U10 is an ACS712 type current sensor.
The control output circuit comprises a signal processing control circuit, wherein the signal processing control circuit comprises an address latch, a first NAND gate and a second NAND gate;
the input end of the first NAND gate and the input end of the second NAND gate are both connected to the output end of the single chip microcomputer; the output end of the first NAND gate is connected to the output control end of the A/D converter; the output end of the second NAND gate is connected to the address latch end of the A/D converter; the address latch is respectively connected with the A/D converter and the singlechip. In this embodiment, the single chip microcomputer is an 8051 series single chip microcomputer. The address latch adopts a latch with the model 74LS 373.
The singlechip is required to be electrified and initialized at the initial electrifying stage, and the protection cannot be realized. The action control circuit is designed to quickly judge the short circuit condition when the breaker is switched on and make corresponding action for protection. During the operation of the single chip microcomputer, the action control circuit judges the extra-large short-circuit current, if the extra-large short-circuit current occurs, the single chip microcomputer does not react in time, the action control circuit can make corresponding judgment and action, and the reliability of the release is improved. The motion control circuit is realized by adopting a comparator amplitude discrimination circuit, and each phase is completed by using two comparators. The amplitudes of the current signals Ia, Ib, Ic are compared to the reference levels VRE + and VRE-. The action control circuit comprises comparators and a magnetic flux converter, the output end of each corresponding current acquisition circuit in the three-phase system is connected with the negative input end of one comparator, and the positive input end of each comparator is respectively connected with the single chip microcomputer U1; the output ends of the comparators are connected with a monostable trigger U8 through a pulse width detection circuit 102, and the monostable trigger U8 is used for controlling the output of a trigger signal to enable the monostable trigger U8 to output pulses with certain width, and a drive circuit enables a magnetic flux converter 105 to be opened, so that the circuit breaker is switched off. As shown in FIG. 4, U2-U7 are comparators, each of which is LM393, with open collector, so that the comparator outputs are connected in parallel and connected to the power supply through a pull-up resistor to realize the line and function. Under normal conditions, the single chip microcomputer does not send out a tripping signal and the amplitude of the current signal is within the range of the reference voltage, the parallel output end of the comparator is pulled high by the pull-up resistor, otherwise, the parallel output end is pulled low as long as the output of any comparator is low. The parallel output end signal of the comparator is connected with the pulse width detection circuit for anti-interference processing, if the low pulse of the parallel output end of the comparator maintains a certain width, the monostable trigger U8 is triggered, and the pulse with a certain width is output to open the magnetic flux converter through the driving circuit, so that the circuit breaker is switched off.
By adopting the comparator amplitude discrimination circuit, some unnecessary narrow pulses appear at the output of the comparator due to the existence of interference in the actual system operation, and false operation can be generated if the comparator amplitude discrimination circuit is directly connected with a monostable trigger. In order to eliminate interference, a pulse width detection circuit is added at the output end of the comparator, the pulse width detection circuit consists of a 555 device, and the output end of the pulse width detection circuit is connected with a monostable trigger consisting of another 555 device.
According to the working waveform of the circuit, as the capacitor needs a certain time to charge, the pulse width detection circuit can trigger the monostable trigger only when the low pulse width output by the parallel output end of the comparator is kept for a certain time. If the pulse output by the parallel output end of the comparator is too narrow, the monostable trigger can not be triggered, so the pulse width detection circuit can eliminate the interference problem of a preceding comparator. The driving circuit comprises a first triode Q1 and a second triode Q2; the base electrode of the first triode Q1 is connected to the output end of the monostable trigger U8, the collector electrode of the first triode Q1 is connected with the anode of a first diode D1, the cathode of the first diode D1 is connected with the cathode of a second diode D2, and the anode of a second diode D2 is connected with a 24v power supply; the flux transformer 105 is connected in parallel across the first diode D1; the collector of the second triode Q2 is connected with the collector of the first triode Q1, and the base of the second triode Q2 is connected with the emitter of the first triode Q1; the emitter of the first transistor Q1 is also coupled to ground through a resistor R, and the emitter of the second transistor Q2 is coupled to ground.
In this embodiment, the control output circuit further includes a display control circuit, where the display control circuit includes a keyboard and display interface chip, a decoder, a keyboard, a first buffer, and a second buffer; the keyboard is connected with the display interface chip; the display interface chip is connected with the first buffer through the decoder; the display interface chip is connected with the second buffer; the keyboard is also connected with the output end of the decoder; the single chip microcomputer is connected with the display interface chip through a keyboard. It should be noted that the keyboard and display interface chip is a chip with model number INTEL8279, which can perform two interface functions of keyboard input and digital display control. The keyboard part provides a scanning working mode, and can actively scan the keyboard at regular time with a matrix of 64 keys, automatically remove jitter, automatically identify the keys and give codes. The display part can respectively provide display interfaces working according to a scanning mode for the light-emitting diode, the fluorescent nixie tube and other display devices, and can support 16-bit digital codes or character display at most; the decoder adopts a 74LS138 decoder; the first buffer and the second buffer use the same type 74LS244 buffer.
The system also comprises an alarm circuit, wherein the alarm circuit is connected with the singlechip; the alarm circuit comprises a current alarm indicator lamp and a voltage alarm indicator lamp, and the current alarm indicator lamp and the voltage alarm indicator lamp are respectively connected with the single chip microcomputer U1. If the measured parameters exceed the set upper limit value and the set lower limit value, an alarm is given, so that a worker can repair the circuit fault as soon as possible. When the fault is eliminated, the alarm is eliminated, and the LED indicator lamp interface circuit is adopted in the embodiment. And when a certain parameter exceeds the limit, the corresponding light-emitting diode is lightened to realize alarming. Because the power factor is generally not exceeded and if the voltage current is not exceeded, the power is also generally not exceeded.
EXAMPLE III
The technical scheme of the invention provides an intelligent control system of a circuit breaker, and the embodiment is different from the second embodiment in that:
in this embodiment, the control output circuit further includes an RS232 interface circuit, the RS232 interface circuit includes a level conversion chip and a driver, the level conversion chip is connected to the driver, and the level conversion chip is connected to the single chip microcomputer. In this embodiment, the level conversion chip is a chip with a model of MAX 232; the system further comprises an upper computer, wherein the single chip microcomputer is connected with the upper computer and used for transmitting the requirement recorded by the upper computer according to the on-off of the circuit breaker and transmitting the parameter configuration information to the upper computer through an operation command and protection.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. An intelligent control system of a circuit breaker is characterized in that the intelligent control system comprises a signal acquisition module, a signal processing module and a control output module; the signal acquisition module is connected with the signal processing module; the signal processing module is connected with the control output module;
the signal acquisition module comprises a voltage acquisition circuit and a current acquisition circuit; the voltage acquisition circuit and the current acquisition circuit are connected to the signal processing module through the phase selection circuit;
the signal processing module comprises an A/D converter, and the voltage acquisition circuit and the current acquisition circuit are connected to the A/D converter through the phase selection circuit;
the control output module comprises a singlechip and a control output circuit; the A/D converter is connected with the single chip microcomputer, and the single chip microcomputer is also connected with the control output circuit; the control output circuit is also connected with the output end of the current acquisition circuit; the control output circuit is connected to the circuit breaker and used for controlling the circuit breaker.
2. The intelligent control system of a circuit breaker according to claim 1, wherein the voltage acquisition circuit comprises voltage-controlled oscillators, the three-phase system is provided with the voltage-controlled oscillators, the input end of each voltage-controlled oscillator is connected with the phase voltage of a corresponding phase, the output end of each voltage-controlled oscillator is connected with a voltage comparator through a voltage-reducing resistor, and the output end of each voltage comparator is connected to the a/D converter through a phase selection circuit;
the current acquisition circuit comprises current sensors, each phase in the three-phase system is connected with one current sensor in series, the signal output end of each current sensor is connected with one voltage comparator, and the output end of each voltage comparator is connected to the A/D converter through a phase selection circuit.
3. The intelligent control system of circuit breaker according to claim 1, characterized in that the system further comprises a power supply module, the power supply module comprises a power conversion module, an input end of the power conversion module is connected to external alternating current, and an output end of the power conversion module comprises a 24v power supply, a VCC-1 power supply and a VCC-2 power supply.
4. The intelligent control system of a circuit breaker according to claim 3, wherein said control output circuit comprises a signal processing control circuit, said signal processing control circuit comprising an address latch, a first nand gate and a second nand gate;
the input end of the first NAND gate and the input end of the second NAND gate are both connected to the output end of the single chip microcomputer; the output end of the first NAND gate and the output end of the second NAND gate are respectively connected to the A/D converter;
the address latch is respectively connected with the A/D converter and the singlechip.
5. The intelligent control system of circuit breaker according to claim 4, wherein the control output circuit comprises an action control circuit, the action control circuit comprises comparators and a magnetic flux converter, the output terminal of each corresponding current collecting circuit in the three-phase system is connected with the negative input terminal of one comparator, and the positive input terminal of each comparator is connected with the single chip microcomputer; the output ends of the comparators are connected with a monostable trigger through a pulse width detection circuit and used for controlling output of a trigger signal to enable the monostable trigger to output pulses with certain width and enable the magnetic flux converter to be opened through a driving circuit so as to break the circuit breaker.
6. The intelligent control system of a circuit breaker according to claim 5, wherein said driving circuit comprises a first transistor and a second transistor; the base electrode of the first triode is connected to the output end of the monostable trigger, the collector electrode of the first triode is connected with the anode of the first diode, the cathode of the first diode is connected with the cathode of the second diode, and the anode of the second diode is connected with a 24v power supply; the magnetic flux converter is connected in parallel at two ends of the first diode; the collector of the second triode is connected with the collector of the first triode, and the base of the second triode is connected with the emitter of the first triode; the emitting electrode of the first triode is grounded through the first resistor, and the emitting electrode of the second triode is grounded.
7. The intelligent control system of a circuit breaker according to claim 3, wherein the control output circuit further comprises a display control circuit, the display control circuit comprising a keyboard and display interface chip, a decoder, a keyboard, a first buffer and a second buffer; the keyboard is connected with the display interface chip; the display interface chip is connected with the first buffer through the decoder; the display interface chip is connected with the second buffer; the keyboard is also connected with the output end of the decoder;
the single chip microcomputer is connected with the display interface chip through a keyboard.
8. The intelligent control system of the circuit breaker according to claim 3, characterized in that the system further comprises an alarm circuit, wherein the alarm circuit is connected with the single chip microcomputer;
the alarm circuit comprises a current alarm indicator lamp and a voltage alarm indicator lamp, and the current alarm indicator lamp and the voltage alarm indicator lamp are respectively connected with the single chip microcomputer.
9. The intelligent control system of a circuit breaker according to claim 3, wherein the control output circuit further comprises an RS232 interface circuit, the RS232 interface circuit comprises a level conversion chip and a driver, the level conversion chip is connected with the driver, and the level conversion chip is connected with the single chip microcomputer.
10. The intelligent control system of the circuit breaker according to claim 1, characterized in that the system further comprises an upper computer, wherein the single chip microcomputer is connected with the upper computer and used for transmitting the requirement recorded by the upper computer according to the on-off of the circuit breaker and transmitting the parameter configuration information through an operation command and protection transmission with the upper computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910971558.7A CN110649580A (en) | 2019-10-14 | 2019-10-14 | Intelligent control system of circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN102315620A (en) * | 2010-06-30 | 2012-01-11 | 施耐德电器工业公司 | Electronic tripper and direct-current circuit breaker provided with same |
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| CN2115614U (en) * | 1992-03-21 | 1992-09-09 | 窦石岭 | Contactless switch source computer controller |
| CN101882789A (en) * | 2010-06-13 | 2010-11-10 | 四川省科学城久信科技有限公司 | Integrated high-voltage intelligent phase selection permanent-magnetic circuit breaker |
| CN102315620A (en) * | 2010-06-30 | 2012-01-11 | 施耐德电器工业公司 | Electronic tripper and direct-current circuit breaker provided with same |
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