CN209786778U - intelligent plastic shell circuit breaker - Google Patents

Abstract

The utility model relates to an intelligent moulded case circuit breaker. Three mutual-inductors are worn respectively to three electricity including main circuit three phase, and the electric energy signal that three mutual-inductor detected out: part of the energy is supplied to a rectifying and filtering module, and part of the energy after filtering is supplied to a working power supply module to form a power supply of a controller, so that power supply voltage is supplied to a microprocessor, a sampling circuit, a signal filtering circuit, a multi-way switch circuit, a window comparator, an amplifying circuit, a rectifying circuit and a driving circuit respectively; the other part of the sampling signals of the three mutual inductors is connected with the sampling circuit and then connected with the filter circuit, one part of the sampling signals is connected with the window comparator circuit after being processed, the other part of the sampling signals is connected with the multi-way switch circuit, the multi-way switch circuit is connected with the amplifying circuit and then connected with the signal rectifying circuit, and then connected with the microprocessor, the output signals of the microprocessor are connected with the driving circuit and then connected with the lock catch rod of the circuit breaker, and the lock catch rod is connected with the tripping. Because the electronic circuit board formed by welding integrated electronic components is adopted, the circuit breaker saves cost and is more beneficial to environmental protection compared with a magneto-thermal circuit breaker.

Description

Intelligent plastic shell circuit breaker

Technical Field

The utility model belongs to a plastic casing formula circuit breaker especially relates to an intelligent plastic casing circuit breaker.

Background

At present, low-voltage electric appliances in a low-voltage distribution network play the roles of electric energy distribution and line protection, the low-voltage electric appliances mainly refer to low-voltage distribution electric appliances and low-voltage protection electric appliances, and circuit breakers in the low-voltage distribution electric appliances are divided into molded case circuit breakers and frame circuit breakers. The release of the molded case circuit breaker is classified into an intelligent type and a magnetic heating type. The magnetic thermal release detects the current by the heated and bent bimetallic strip to realize overload protection and instantaneous protection. In the last century, the magneto-thermal circuit breaker is used for realizing current protection in a circuit, and in the fourth generation intelligent network era of the 21 st century, all low-voltage electric appliances only realize current protection and cannot meet the requirements of an intelligent power grid, so that the intelligent molded case circuit breaker is produced at the right moment. The intelligent circuit breaker detects the current in the main loop through the mutual inductor, and the microprocessor performs calculation, judgment and processing to realize four-section protection of overload, short circuit short delay, short circuit instant, grounding and the like.

Disclosure of Invention

The utility model discloses a solve the technical problem that exists among the well-known art and provide one kind and practice thrift the cost more, more do benefit to the intelligent moulded case circuit breaker of environmental protection.

The utility model discloses a solve the technical scheme that technical problem that exists among the well-known technique took and be: the three-phase power supply comprises a main circuit three-phase power A, B, C, wherein three transformers (CT) respectively penetrate through the three phases, part of electric energy signals detected by the three transformers (CT) are supplied to a rectification filter module (Q3), the rectification filter module (Q3) provides part of energy to a working power supply module (Q4) to form a power supply of a controller after filtering, and the working power supply module (Q4) respectively supplies power supply voltage to a microprocessor (Q5), a sampling circuit (Q6), a signal filter circuit (Q7), a multi-way switch circuit (Q8), a window comparator (Q11), an amplifying circuit (Q9), a rectifying circuit (Q10) and a driving circuit (Q2); the other part of sampling signals of the three transformers (CT) is connected with the sampling circuit (Q6), the sampling circuit (Q6) is connected with the filter circuit (Q7), one part of the processed signals of the filter circuit (Q7) is connected with the window comparator (Q11), the other part of the processed signals of the filter circuit (Q7) is connected with the multi-way switch circuit (Q8), then the multi-way switch circuit (Q8) is connected with the amplifying circuit (Q9), the amplifying circuit (Q9) is connected with the signal rectifying circuit (Q10), the signal rectifying circuit (Q10) is connected with the microprocessor (Q5), the output signal of the microprocessor (Q5) is connected with the driving circuit (Q2), and the driving circuit (Q2) is connected with the lock catch lever (Q1) of the circuit breaker; the lock catch rod (Q1) is connected with a tripping mechanism of the molded case circuit breaker.

The utility model discloses can also adopt following technical scheme:

Part of electric energy signals detected by the three transformers (CT) are sent to a full-wave rectification filtering module (Q3); the working power supply module (Q4) gets power from the full-wave rectification filter module (Q3), stabilizes the voltage to 10V through a voltage-stabilizing tube, then regulates through electronic devices such as resistance voltage division, a triode and the like, divides +5V/-5V, then supplies power to the microprocessor by the +5V/-5V, supplies power to positive and negative signals of the integrated operational amplifier and supplies power to the sampling circuit (Q6), the signal filter circuit (Q7), the multi-way switch circuit (Q8), the window comparator (Q11), the amplifying circuit (Q9), the rectifying circuit (Q10) and the driving circuit (Q2); the microprocessor (Q5) is a microprocessor in the PIC16F series of the United states; the other part of the electric energy signals detected by the three transformers (CT) is respectively connected with four paths of resistance voltage division, an active filter, a voltage follower, second-order filtering, multi-path switch gating and an inverse proportion amplifier through A, B, C, N four phases; the driving circuit (Q2) is composed of a driving circuit and a magnetic flux converter, and a permanent magnet in the magnetic flux converter enables an iron core to attract.

the utility model has the advantages and positive effects that: the intelligent molded case circuit breaker is more accurate in detection, faster in fault action time, higher in reliability and stronger in stability. The bimetal of the magnetocaloric molded case circuit breaker may affect the operation speed and reliability of the circuit breaker due to material problems or environmental temperature. The utility model discloses an all be the electronic circuit board that integrated electronic components welded, practice thrift the cost more, more do benefit to the environmental protection than the magnetic heating type circuit breaker like this.

Drawings

FIG. 1 is a schematic block diagram of the present invention;

FIG. 2 is a schematic circuit diagram of the driving circuit of the present invention;

Fig. 3 is a schematic circuit diagram of the signal processing part of the present invention.

Detailed Description

For further understanding of the contents, features and effects of the present invention, the following embodiments are exemplified and will be described in detail with reference to the accompanying drawings:

As shown in fig. 1, three main loop three-phase power A, B, C respectively passes through three transformers CT, electric energy signals detected by the transformers CT are partially supplied to a rectifying and filtering module Q3, and are supplied with a part of energy after passing through a rectifying and filtering module Q3 to a working power supply module Q4 to form a power supply of a controller, and the power supply module Q4 supplies power supply voltage to a microprocessor Q5, a sampling circuit Q6, a signal filtering circuit Q7, a multi-way switch Q8, a window comparison Q11, an amplifying circuit Q4 and a rectifying circuit Q10. The other part of the sampling signal of the mutual inductor CT is connected with a sampling circuit Q6, a sampling circuit Q6 is connected with a filter circuit Q7, one part of the filter current processed by the filter circuit Q7 is connected with a window comparator Q11, the other part of the filter current is connected with a multi-way switch circuit Q8, the multi-way switch circuit is connected with an amplifying circuit Q8, the amplifying circuit Q8 is connected with a signal rectifying circuit Q10, a rectifying circuit Q10 is connected with a microprocessor Q5, the output signal of the microprocessor Q5 is connected with a driving circuit Q2, and the driving circuit Q2 is connected with a lock catch lever Q1 of a circuit breaker; the latch lever Q1 is connected with a trip mechanism of the molded case circuit breaker.

As shown in fig. 2, the driving signal of the controller is composed of two parts, one part is that the signal of the microprocessor Q5 is connected with the base of the triode Q2 through a signal isolation circuit composed of a resistor R1, a coupler U1, a resistor R5, a diode D2 and a resistor R6; the other part is that an out-of-limit signal (a signal with a stronger window) is connected with a resistor R2, a resistor R3, a capacitor C1, a triode Q1, a resistor R4 and a diode D1 to form a signal isolation processing circuit, and a triode Q2, a triode Q3, a diode D3, a diode D4 and a magnetic flux converter form a driving circuit.

a driving part: the magnetic flux converter is a reverse excitation releasing mechanism, and a permanent magnet in the magnetic flux converter enables an iron core to be attracted. When overcurrent occurs, the electronic circuit outputs a certain voltage signal, and the coil in the magnetic flux converter is electrified to generate a reverse magnetic field to counteract the magnetic field of the permanent magnet. The iron core is released under the action of the counterforce spring, and the tripping rod mechanism (magnetic flux converter) is pushed to act. The sampling is carried out once every 1ms, and if 16 data are sampled, the calculation time is ignored and the action time of the executive component is at least 25-30 ms.

As shown in fig. 3, the signal processing is performed by filtering the signal ia detected by the transformer CT through an active filter circuit composed of a resistor R1, a resistor R2, a capacitor C1 and an integrated operational amplifier u 1; the filtered signal is subjected to voltage division through an electric group R3 and a resistor R4, the divided signal is subjected to inverse proportion amplification circuit consisting of a resistor R5, a resistor R6, a resistor R7 and an integrated operational amplifier u2, the signal is amplified, then the signal is subjected to signal limitation through a voltage follower u3, a resistor R8, a diode D1, a diode D2, a resistor R9 and a capacitor C2, and finally a signal IA2 is obtained and sent to a microprocessor.

The action principle process is as follows: the mutual inductor CT detects signals from the main loop, a signal P of the solid mutual inductor is connected with rectification and filtering, and a signal L of the hollow mutual inductor is connected with a sampling circuit; the rectification filter circuit provides signals to the working power supply module, the working power supply module forms a plurality of power supply voltages required by the controller, and +5v working voltage is provided for the microprocessor Q5; the power supply circuit supplies +/-5V working voltage to a sampling circuit, a filter circuit, a multi-way switch, an amplifying circuit and a rectifying circuit, and also supplies 12V working voltage to a driving circuit. The signal of the hollow mutual inductor P is connected with a sampling circuit, after being processed by the sampling circuit, the noise and clutter in the signal are filtered by a filter circuit, then the processed signal is transmitted to a multi-way switch circuit, the multi-way switch circuit is mainly used for gating three signals in turn, then the gated signal is amplified, the signal is amplified by several times and is amplified into a signal required by a microprocessor, then the signal enters a rectifier circuit, all the positive whole string signals are boosted by all reference voltages of 1.25V, all the signals are changed into positive signals, then the signal is transmitted to the microprocessor, and the microprocessor detects, compares, judges and processes the signal; if the detected signal is higher than the set value, the microprocessor sends a trigger signal, the trigger signal is connected with the driving circuit and converts electric energy into kinetic energy through the magnetic flux converter, after the lock catch rod is pushed, the mechanism acts after the lock catch is opened, and the breaker is opened.

Claims (2)

1. The utility model provides an intelligent moulded case circuit breaker, it wears three mutual-inductor (CT) respectively including main circuit three phase electricity A, B, C three-phase, characterized by: part of electric energy signals detected by the three transformers (CT) are supplied to a rectifying and filtering module (Q3), the rectifying and filtering module (Q3) provides part of energy to a working power supply module (Q4) to form a power supply of the controller after filtering, and the working power supply module (Q4) respectively provides power supply voltage for a microprocessor (Q5), a sampling circuit (Q6), a signal filtering circuit (Q7), a multi-way switch circuit (Q8), a window comparator (Q11), an amplifying circuit (Q9), a rectifying circuit (Q10) and a driving circuit (Q2); the other part of sampling signals of the three transformers (CT) is connected with the sampling circuit (Q6), the sampling circuit (Q6) is connected with the filter circuit (Q7), one part of the processed signals of the filter circuit (Q7) is connected with the window comparator (Q11), the other part of the processed signals of the filter circuit (Q7) is connected with the multi-way switch circuit (Q8), then the multi-way switch circuit (Q8) is connected with the amplifying circuit (Q9), the amplifying circuit (Q9) is connected with the signal rectifying circuit (Q10), the signal rectifying circuit (Q10) is connected with the microprocessor (Q5), the output signal of the microprocessor (Q5) is connected with the driving circuit (Q2), and the driving circuit (Q2) is connected with the lock catch lever (Q1) of the circuit breaker; the lock catch rod (Q1) is connected with a tripping mechanism of the molded case circuit breaker.

2. The intelligent molded case circuit breaker according to claim 1, wherein: part of electric energy signals detected by the three transformers (CT) are sent to a full-wave rectification filtering module (Q3); the working power supply module (Q4) gets power from the full-wave rectification filter module (Q3), stabilizes the voltage to 10V through a voltage-stabilizing tube, then regulates through electronic devices such as resistance voltage division, a triode and the like, divides +5V/-5V, then supplies power to the microprocessor by the +5V/-5V, supplies power to positive and negative signals of the integrated operational amplifier and supplies power to the sampling circuit (Q6), the signal filter circuit (Q7), the multi-way switch circuit (Q8), the window comparator (Q11), the amplifying circuit (Q9), the rectifying circuit (Q10) and the driving circuit (Q2); the microprocessor (Q5) is a microprocessor in the PIC16F series of the United states; the other part of the electric energy signals detected by the three transformers (CT) is respectively connected with four paths of resistance voltage division, an active filter, a voltage follower, second-order filtering, multi-path switch gating and an inverse proportion amplifier through A, S, C, N four phases; the driving circuit (Q2) is composed of a driving circuit and a magnetic flux converter, and a permanent magnet in the magnetic flux converter enables an iron core to attract.