All-in-one universal circuit breaker

Abstract

The present application relates to the field of low-voltage electrical apparatus, in particular to a comprehensive perception universal circuit breaker, an intelligent controller of a control system of the comprehensive perception universal circuit breaker comprising an MCU circuit, and a circuit breaker self-checking module of the intelligent controller comprising: a current sampling circuit comprising a mutual inductor disconnection detection circuit for detecting a connection state of a hollow mutual inductor; a core mutual inductor working current detection circuit for monitoring an output current of a core mutual inductor; a magnetic flux tripping device disconnection detection circuit for detecting a connection state of a magnetic flux tripping device of an execution unit; an auxiliary power supply voltage detection circuit for detecting an input state of an auxiliary power supply for supplying power to a short-circuit protection mechanism; an energy storage readiness detection circuit for detecting an energy storage state of an energy storage operating mechanism; and a tripping state detection circuit for detecting a tripping state of the universal circuit breaker; the circuit breaker self-checking module of the comprehensive perception universal circuit breaker can perform self-checking on a working state of the universal circuit breaker, thereby ensuring reliable and stable working of the universal circuit breaker.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of low-voltage electrical apparatus, in particular to a comprehensive perception type universal circuit breaker. BACKGROUND

[0002] The core function of the traditional universal circuit breaker is to protect the power distribution network, generally equipped with a simple intelligent controller, so it generally only collects current and voltage parameters. With the continuous improvement and perfection of product performance, higher requirements are also put forward for its reliability, therefore, the working state of the product itself needs to be monitored, and the existing universal circuit breaker cannot meet this demand. SUMMARY

[0003] The present application aims to overcome the defects of the prior art, and provides a comprehensive perception type universal circuit breaker, which can self-check the working state of the universal circuit breaker through a circuit breaker self-checking module, thereby ensuring the reliable and stable operation of the universal circuit breaker.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] A comprehensive perception type universal circuit breaker, which comprises a circuit breaker body and a control system, the control system comprising an intelligent controller, the intelligent controller comprising an MCU circuit and a circuit breaker self-checking module connected to the MUC circuit;

[0006] The circuit breaker self-checking module comprises:

[0007] A current sampling circuit comprising a mutual inductor disconnection detection circuit for detecting the connection state of the air-core mutual inductor of the universal circuit breaker;

[0008] An iron core mutual inductor working current detection circuit for monitoring the output current of the iron core mutual inductor of the universal circuit breaker;

[0009] A magnetic flux release disconnection detection circuit for detecting the connection state of the magnetic flux release of the execution unit of the universal circuit breaker;

[0010] An auxiliary power supply voltage detection circuit for detecting the input state of the auxiliary power supply for supplying power to the short-circuit protection mechanism of the universal circuit breaker;

[0011] An energy storage readiness detection circuit for detecting the energy storage state of the energy storage operating mechanism of the universal circuit breaker;

[0012] A tripping state detection circuit for detecting the tripping state of the universal circuit breaker.

[0013] Preferably, the current sampling circuit further comprises a current processing circuit, which comprises an integration circuit and an amplification circuit, and processes and transmits the signal of the air-core mutual inductor to the MCU circuit.

[0014] Preferably, the iron core mutual inductor operating current detection circuit is connected with the AD sampling port of the MCU circuit, converts the output current signal of the iron core mutual inductor into a voltage signal and transmits the voltage signal to the MCU circuit through the AD sampling port.

[0015] Preferably, the magnetic flux tripping device disconnection detection circuit comprises a diode D6, a diode D8, a resistor R1, a resistor R2 and a comparator U4A, the cathodes of the diode D6 and the diode D8 are connected, the anode of the diode D8 is connected with one end of the resistor R1, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with the positive input end of the comparator U4A, and the node between the diode D6 and the diode D8 and the node between the diode D8 and the resistor R1 are connected with the magnetic flux coil respectively.

[0016] Preferably, the auxiliary power supply voltage detection circuit is connected with the AD sampling port of the MCU circuit, and the auxiliary power supply is resistance-divided and power-filtered and then transmitted to the MCU circuit.

[0017] Preferably, the circuit breaker self-checking module further comprises a busbar temperature acquisition circuit for detecting the temperature of the internal busbar of the universal circuit breaker.

[0018] Preferably, the universal circuit breaker further comprises a position monitoring module for detecting the working position of the circuit breaker body.

[0019] Preferably, the intelligent controller further comprises a current and voltage measurement circuit, the current and voltage measurement circuit comprises a metering chip and a current sampling part and a voltage sampling part connected with the metering chip respectively, and the metering chip is connected with the MCU circuit.

[0020] Preferably, the universal circuit breaker further comprises an accessory detection module, the accessory detection module comprises an under-voltage monitoring circuit, a split excitation monitoring circuit, a closing monitoring circuit and a motor monitoring circuit for detecting the under-voltage release, the split excitation release, the closing electromagnet and the energy storage motor of the universal circuit breaker respectively.

[0021] Preferably, the intelligent controller further comprises an environment monitoring module connected with the MCU circuit, the environment monitoring module comprises a temperature and humidity sensing circuit, an atmospheric pressure measurement circuit and a dust detection circuit.

[0022] Preferably, the intelligent controller comprises an interface board, a power supply board, a control board, an MCR protection board, a wireless communication module and a liquid crystal display module.

[0023] Preferably, the intelligent controller further comprises a controller housing, the controller housing comprises a transparent long door, the transparent long door extends to the key part and is provided with a lock structure.

[0024] Preferably, the intelligent controller calculates the contact wear rate of the universal circuit breaker by the following method:

[0025] η(n) = 1 / [(In / I(n))^a*Le]

[0026] η = [η(1) + η(2) + … η(n)]

[0027] Wherein, η(n) is the single tripping wear rate, the minimum value is the mechanical life reciprocal; η is the total contact wear rate; In is the rated current; I(n) is the tripping current; a is the coefficient, which is a constant; Le is the product electrical life, which is a constant.

[0028] Preferably, the intelligent controller calculates the thermal aging rate of the universal circuit breaker by the following method:

[0029] R = 1-(N-(I / 0.8In)^2*(W / 40)^2*D) / N

[0030] Wherein, R is the thermal aging rate of the universal circuit breaker; N is the design depreciation days; I is the daily average current; W is the operating environment temperature of the universal circuit breaker; D is the cumulative running days.

[0031] Preferably, the intelligent controller calculates the health degree of the universal circuit breaker by the following method:

[0032] H = min[(1-R*100), (1-η*100)]

[0033] Wherein, H is the health degree of the universal circuit breaker; R is the thermal aging rate of the circuit breaker; η is the contact wear rate.

[0034] The present application comprehensively perceives the universal circuit breaker, and the circuit breaker self-checking module of the intelligent controller can detect multiple components or structures of the universal circuit breaker to determine whether it works normally, thereby ensuring stable and reliable work of the universal circuit breaker.

[0035] In addition, the present application comprehensively perceives the universal circuit breaker, and the intelligent controller further comprises an environment monitoring module to detect the environment of the universal circuit breaker, thereby ensuring that the universal circuit breaker works in the correct mode.

[0036] In addition, the present application comprehensively perceives the universal circuit breaker, and the intelligent controller can calculate the contact wear rate, the thermal aging rate and the health degree, so that the user can master the mechanical and electrical life of the universal circuit breaker in real time, thereby ensuring the reliability and stability of the power distribution network.

[0037] In addition, the present application comprehensively perceives the universal circuit breaker, and the accessory detection module can detect the working state of each accessory in real time, thereby ensuring the reliable and stable operation of each accessory. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is the structural schematic diagram of the comprehensive perception universal circuit breaker of the present application;

[0039] Figure 2a is the structural schematic diagram of the intelligent controller of the present application;

[0040] Figure 2b is the exploded structural schematic diagram of the intelligent controller of the present application;

[0041] Figure 3 is the topology diagram of the MCU circuit of the present application;

[0042] Figure 4 is the topology diagram of the current processing circuit of the present application;

[0043] Figure 5 is the topology diagram of the iron core mutual inductor working current detection circuit of the present application;

[0044] Figure 6 is the topology diagram of the magnetic flux release detector disconnection detection circuit of the present application;

[0045] Figure 7a is the topology diagram of the energy storage readiness detection circuit of the present application;

[0046] Figure 7b is the topology diagram of the release state detection circuit of the present application;

[0047] Figure 8a is the topology diagram of the current sampling part of the present application;

[0048] Figure 8b is the topology diagram of the voltage sampling part of the present application;

[0049] Figure 8c is the topology diagram of the metering chip of the present application;

[0050] Figure 9 is the topology diagram of the busbar temperature acquisition circuit of the present application;

[0051] Figure 10a is the topology diagram of the temperature and humidity sensing circuit of the present application;

[0052] Figure 10b is the topology diagram of the atmospheric pressure measurement circuit of the present application;

[0053] Figure 10c is the topology diagram of the dust detection circuit of the present application;

[0054] Figure 11 is the functional module schematic diagram of the comprehensive perception universal circuit breaker of the present application;

[0055] Figure 12It is a topology diagram of the auxiliary power supply voltage detection circuit of the application. DETAILED DESCRIPTION

[0056] The embodiments of the application are further illustrated in the following examples in conjunction with the accompanying drawings of the specification. The application of the comprehensive perception universal circuit breaker is not limited to the description of the following embodiments.

[0057] The application of the comprehensive perception universal circuit breaker comprises a circuit breaker body 1 and a control system, and the control system comprises an intelligent controller 2.

[0058] The current sampling circuit comprises a mutual inductor disconnection detection circuit for detecting the connection state of the air-core mutual inductor of the universal circuit breaker.

[0059] The core mutual inductor working current detection circuit is used for detecting the output current of the core mutual inductor of the universal circuit breaker.

[0060] The magnetic flux tripping device disconnection detection circuit is used for detecting the connection state of the magnetic flux tripping device of the execution unit of the universal circuit breaker.

[0061] The auxiliary power supply voltage detection circuit is used for detecting the input state of the auxiliary power supply for supplying power to the short-circuit protection mechanism of the universal circuit breaker.

[0062] The circuit breaker self-checking module of the intelligent controller of the application of the comprehensive perception universal circuit breaker can detect multiple components or structures of the universal circuit breaker to determine whether they work normally, thereby ensuring the stable and reliable operation of the universal circuit breaker.

[0063] The following is an embodiment of the application of the comprehensive perception universal circuit breaker.

[0064] As shown in Figure 1 and 11 , the embodiment of the comprehensive perception universal circuit breaker comprises a circuit breaker body 1 and a control system, and the control system comprises an intelligent controller 2.

[0065] The circuit breaker body 1 comprises a conduction system, an arc extinguishing system and an operating mechanism, the operating mechanism is connected with the conduction system driving to control the closing or opening of the comprehensive perception universal circuit breaker, and the arc extinguishing system cooperates with the conduction system to extinguish the electric arc generated when the conduction system is broken or closed.

[0066] As shown in Figure 1 , the intelligent controller 2 is fixedly arranged on the circuit breaker body 1.

[0067] As shown in Figure 11As shown in the figure, the intelligent controller 2 comprises an MCU circuit and a circuit breaker self-checking module connected with the MCU circuit, the circuit breaker self-checking module comprises a current sampling circuit, an iron core transformer working current detection circuit for monitoring the output current of the iron core transformer, a magnetic flux tripping breaker disconnection detection circuit for detecting the connection state of the magnetic flux tripping breaker of the execution unit, and an auxiliary power supply voltage detection circuit for detecting the input state of the auxiliary power supply for the short-circuit protection mechanism, the current sampling circuit comprises a transformer disconnection detection circuit for detecting the connection state of the air core transformer. Further, the circuit breaker self-checking module further comprises an energy storage readiness detection circuit for detecting the energy storage state of the energy storage operating mechanism, a tripping state detection circuit for detecting the tripping state of the universal circuit breaker, and a busbar temperature acquisition circuit for detecting the internal busbar temperature of the universal circuit breaker.

[0068] As shown in the figure, Figure 11 The intelligent controller 2 further comprises a communication circuit, which is connected with a PC host and / or a portable handheld device and / or a cloud communication for information display and / or alarm and / or parameter setting of the intelligent controller 2. Further, the communication circuit is connected with the PC host through RS485, connected with the portable handheld device through Bluetooth or WIFI, and connected with the cloud communication through the Internet.

[0069] As shown in the figure, Figure 2b The intelligent controller 2 comprises an interface board 21, a power supply board 22, a control board 23, an MCR protection board 24, a wireless communication module 25, and a liquid crystal display module 26. Further, as shown in the figure, Figure 2a The intelligent controller further comprises a controller housing, and the above components are all installed in the controller housing, the controller housing further comprises a transparent long door 20 extending to the key part of the intelligent controller, the transparent long door is provided with a lock structure to avoid unrelated personnel operating the intelligent controller.

[0070] As shown in the figure, Figure 3 An embodiment of the MCU circuit is shown in the figure.

[0071] The MCU circuit comprises an EEPROM storage unit and a FLASH storage unit, and the MCU circuit can judge whether the EEPROM storage unit and the FLASH storage unit are normally connected through data processing to ensure normal information storage.

[0072] As shown in the figure, Figure 4As shown, the current sampling circuit comprises a current processing circuit, which comprises an integration circuit and an amplification circuit, and processes the signal of the air-core transformer and transmits the signal to the MCU circuit. Further, the integration circuit filters the signal of the air-core transformer, and then the signal is amplified by the amplification circuit. The amplification circuit comprises two paths. One path has a large amplification factor and is used to detect a small signal at the front end. After amplification, the signal is connected to the MCU circuit for AD conversion. The other path has a small amplification factor and is used to detect a large signal at the front end. The signal is also connected to the MCU circuit for AD conversion.

[0073] The current processing circuit corresponds to each phase of the universal circuit breaker one by one, that is, each phase of the universal circuit breaker is connected to one current processing circuit, and the structures of the current processing circuits are the same. For example, when the universal circuit breaker is a four-phase circuit breaker, the A, B, C and D phases are respectively connected to four current processing circuits.

[0074] Hereinafter, the current processing circuit connected to the C phase of the universal circuit breaker, hereinafter referred to as the C-phase current processing circuit, will be taken as an example for description:

[0075] As shown in FIG. 2, the C-phase current processing circuit comprises an integration circuit 21, an amplification circuit 22 and a MCU circuit 23. Figure 4As shown, the C-phase current processing circuit includes an amplifier U19A, an amplifier U19B and an amplifier U20A; the non-inverting input terminal (the 3rd pin) of the amplifier U20A is grounded through a capacitor C60, the resistor R73 is connected in parallel with the capacitor C60, the non-inverting input terminal of the amplifier U20A is also connected with the IC_P terminal through a resistor R69, the inverting input terminal (the 2nd pin) of the amplifier U20A is connected with the IC_N terminal through a resistor R65, the IC_P terminal and the IC_N terminal are respectively connected with the output terminal of the air-core mutual inductor of the universal circuit breaker C-phase, the anode of a diode D8 is connected with the node between the resistor R65 and the IC_N terminal, the cathode of the diode D8 is connected with the C_LINE terminal, the C_LINE terminal is connected with the 5th pin of the MCU, the inverting input terminal of the amplifier U20A is also connected with the output terminal (the 1st pin) of the amplifier U20A through the parallel resistor R59 and capacitor C52, the negative power supply pin (the 11th pin) of the amplifier U20A is grounded through a capacitor C53 and connected with a -2.5V power supply, the positive power supply pin (the 4th pin) of the amplifier U20A is grounded through a capacitor C58 and connected with a +2.5V power supply; the output terminal of the amplifier U20A is connected with the inverting input terminal (the 2nd pin) of the amplifier U19A through a resistor R57, the non-inverting input terminal of the amplifier U19A is grounded through a resistor R67 and connected with a +3.0V power supply through a resistor R63, the inverting input terminal of the amplifier U19A is connected with the output terminal (the 1st pin) of the amplifier U19A through a resistor R55, the node between the amplifier U19A and the resistor R55 is the T54 node, the T54 node can be used as a test node, the output terminal of the amplifier U19A is grounded through the resistor R61 and the capacitor C55 connected in series, the negative power supply pin (the 11th pin) of the amplifier U19A is grounded, the positive power supply pin of the amplifier U19A is grounded through a capacitor C57 and connected with the AVCC terminal, (the AVCC terminal is preferably the positive terminal of a 3.3V power supply, connected with the 26th pin of the measurement chip of the current-voltage measurement circuit) the node between the resistor R61 and the capacitor C55 is the L3M node, the L3M node is connected with the 16th pin of the MCU; the output terminal of the amplifier U20A is connected with the inverting input terminal (the 6th pin) of the amplifier U19B through a resistor R75, the inverting input terminal of the amplifier U19B is connected with the output terminal (the 7th pin) of the amplifier U19B through a resistor R71, the non-inverting input terminal (the 5th pin) of the amplifier U19B is grounded through a resistor R81 and connected with a +3.0V power supply through a resistor R71, the output terminal of the amplifier U19B is grounded through the resistor R77 and the capacitor C62 connected in series, the node between the resistor R77 and the capacitor C62 is the L3L node, the L3L node is connected with the 25th pin of the MCU.

[0076] The current sampling circuit further comprises a transformer disconnection detection circuit for detecting the connection state of the air-core transformer of the universal circuit breaker. Further, the transformer disconnection detection circuit comprises four diodes to detect whether the air-core transformer is normally connected, so as to identify the transformer disconnection fault in advance. Further, the four diodes comprise a diode D8 of the C-phase current processing circuit and corresponding diodes of the current processing circuits of the remaining three phases (A, B, and D phases); for example, if the air-core transformer of the C phase is not disconnected, the anode of the diode D8 is connected to the 5th pin of the MCU, the MCU pin is at high level, and the level of the amplification circuit or is raised to about 3V (normally 1.5V); if the air-core transformer of the C phase is disconnected, the MCU pin is at low level.

[0077] As shown in Figure 5 , the core transformer working current detection circuit is connected to the AD sampling port of the MCU circuit.

[0078] As shown in Figure 5 , the core transformer working current detection circuit converts the output current signal of the core transformer into a voltage signal and transmits it to the MCU circuit to monitor whether the output working current of the core transformer is reliable and stable (for example, whether the voltage and current values remain stable). Further, the output current of the core transformer flows through the resistor R202, a potential difference is generated across the resistor R202, and then the amplified signal is transmitted to the MCU circuit after being amplified by the operational amplifier to calculate the output current of the core transformer.

[0079] Specifically, as shown in Figure 5 , the core transformer working current detection circuit comprises a resistor R202, a resistor R204, a resistor R205, a resistor R206, a resistor R207, an amplifier U113A, a polarity capacitor C152, and a capacitor C153. The resistor R202 is connected in series between an output terminal of the core transformer and a load. One end of the resistor R204 is connected to a node of the core transformer and the resistor R202, and the other end of the resistor R204 is connected to the inverting input terminal of the amplifier U113A. The resistor R205 is connected in series between the inverting input terminal (2nd pin) and the output terminal (1st pin) of the amplifier U113A. The non-inverting input terminal (3rd pin) of the amplifier U113A is grounded through the resistor R206. The output terminal of the amplifier U113A is connected to the MCU circuit through the resistor R207. The positive power supply pin (4th pin) of the amplifier U113A is grounded. The negative power supply pin (8th pin) of the amplifier U113A is connected to the +5V power supply. The positive electrode of the polarity capacitor C152 is connected to a node between the resistor R207 and the MCU circuit. The negative electrode of the polarity capacitor C152 is grounded. The capacitor C153 is connected in parallel with the polarity capacitor C152.

[0080] As shown in Figure 6As shown in the figure, the magnetic flux tripping device wire breakage detection circuit for detecting the connection state (normal connection or wire breakage) of the magnetic flux tripping device of the execution unit of the universal circuit breaker comprises a diode D6, a diode D8, a resistor R1, a resistor R2 and a comparator U4A, the cathodes of the diode D6 and the diode D8 are connected, the anode of the diode D8 is connected with one end of the resistor R1, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with the positive input terminal of the comparator U4A, and the nodes between the diode D6 and the diode D8 and the nodes between the diode D8 and the resistor R1 are respectively connected with the magnetic flux coil.

[0081] Specifically, as shown in the figure, Figure 6 As shown in the figure, the magnetic flux tripping device wire breakage detection circuit comprises a diode D6, a diode D8, a resistor R1, a resistor R2 and an amplifier U4A, the cathodes of the diode D6 and the diode D8 are connected, the anode of the diode D6 is connected with the VIN terminal, the VIN terminal is connected with the input power supply of the intelligent controller, the anode of the diode D8 is grounded through the resistor R1 and the resistor R2 connected in series, the nodes between the diode D6 and the diode D8 and the nodes between the diode D8 and the resistor R1 are respectively connected with the magnetic flux tripping device coil, the node between the resistor R1 and the resistor R2 is the DX node, the DX node is connected with the non-inverting input terminal (the 3rd pin) of the comparator U4A, the inverting input terminal (the 2nd pin) of the comparator U4A is grounded through the capacitor C20, the resistor R73 and the resistor R74 connected in series, the node between the capacitor C20 and the resistor R73 is connected with the +5V power supply, the output terminal (the 1st pin) of the comparator U4A is connected with the DX1 DX1 terminal, the DX1 DX1 terminal is connected with the 38th pin of the MCU, the positive power supply pin (the 4th pin) of the comparator U4A is grounded, and the negative power supply pin (the 8th pin) of the comparator U4A is connected with the +5V power supply.

[0082] As shown in the figure, Figure 12 As shown in the figure, the auxiliary power supply voltage detection circuit is connected with the AD sampling port of the MCU circuit, and after resistance voltage division and power supply filtering, the auxiliary power supply input terminal is delivered to the MCU circuit to monitor the input state of the auxiliary power supply in real time (for example, whether the auxiliary power supply exists, whether the voltage and the current are stable, etc.), detect the power supply condition of the auxiliary power supply, and preferentially guarantee the short-circuit protection function execution of the universal circuit breaker.

[0083] As shown in the figure, Figure 7aAs shown, the energy storage ready detection circuit is used to detect whether the energy storage operating mechanism of the universal circuit breaker is complete, which includes an optical coupler U24 and an energy storage micro switch MS1. The energy storage micro switch MS1 is matched with the energy storage operating mechanism. The energy storage operating mechanism triggers the energy storage micro switch MS1 to change the conduction state after completing the energy storage. The first pin of the optical coupler U24 is connected with the power supply DVCC through the resistance R127, the energy storage micro switch MS1 and the power supply DVCC in series, the second pin is grounded, the third pin is connected with the chuCHEAK end, and the chuCHEAK end is connected with the 59th pin of the MCU. The fourth pin is connected with the power supply DVCC through the resistance R126.

[0084] As shown in the Figure 7b , the tripping state detection circuit is used to detect the tripping state of the universal circuit breaker, that is, whether the universal circuit breaker is tripped. It includes an optical coupler U6 and a tripping micro switch MS2. The tripping micro switch MS2 is triggered to change the conduction state when the universal circuit breaker is tripped. The first pin of the optical coupler U6 is connected with the power supply DVCC through the resistance R125, the tripping micro switch MS2 and the power supply DVCC in series, the second pin is grounded, the third pin is connected with the TRIP_CHEAK end, and the TRIP_CHEAK end is connected with the 60th pin of the MCU. The fourth pin is connected with the power supply DVCC through the resistance R39.

[0085] As shown in the Figure 9 , the busbar temperature acquisition circuit detects the temperature of the busbar inside the universal circuit breaker in real time through the temperature acquisition thermistor installed on the busbar. Further, the universal circuit breaker of the embodiment is a multi-phase (for example, three-phase or four-phase) circuit breaker. Each phase busbar of the universal circuit breaker is matched with the corresponding busbar temperature acquisition circuit. The following is an example of the A-phase corresponding busbar temperature acquisition circuit: the A-phase busbar of the universal circuit breaker corresponding busbar temperature acquisition circuit includes an amplifier U5A. The positive input end (3rd pin) of the amplifier U5A is connected with the NFC_VCC power supply through the capacitor C26 and the resistance R7, and the capacitor C26 is connected with the temperature acquisition thermistor in parallel. The negative input end (2nd pin) of the amplifier U5A is connected with the output end (1st pin) of the amplifier U5A. The output end of the amplifier U5A is grounded through the resistance R9 and the capacitor C24 in series. The node between the resistance R9 and the capacitor C24 is connected with the TA_AD end. The TA_AD end can be directly connected to the MCU shown in the Figure 3 for temperature calculation or connected to the second MCU with Bluetooth function. After the temperature is calculated by the second MCU, the temperature data is transmitted to the MCU shown in the Figure 3 through serial communication. The universal circuit breaker with comprehensive perception is matched with the corresponding temperature acquisition thermistor and busbar temperature acquisition circuit.

[0086] As shown in FIG. 8 and 11, the intelligent controller further comprises a current-voltage measurement circuit, which comprises a metering chip circuit and a current sampling part and a voltage sampling part connected to the metering chip circuit respectively, and the metering chip circuit is connected to the MCU circuit. Further, the current-voltage measurement circuit is connected to the MCU circuit through a serial communication, and the metering chip circuit transmits the data collected by the current sampling part and the voltage sampling part to the MCU circuit after calculation.

[0087] As shown in FIG. 8 and 11, the intelligent controller further comprises a current-voltage measurement circuit, which comprises a metering chip circuit and a current sampling part and a voltage sampling part connected to the metering chip circuit respectively, and the metering chip circuit is connected to the MCU circuit. Further, the current-voltage measurement circuit is connected to the MCU circuit through a serial communication, and the metering chip circuit transmits the data collected by the current sampling part and the voltage sampling part to the MCU circuit after calculation. Figure 8a As shown in FIG. 8 and 11, the intelligent controller further comprises a current-voltage measurement circuit, which comprises a metering chip circuit and a current sampling part and a voltage sampling part connected to the metering chip circuit respectively, and the metering chip circuit is connected to the MCU circuit. Further, the current-voltage measurement circuit is connected to the MCU circuit through a serial communication, and the metering chip circuit transmits the data collected by the current sampling part and the voltage sampling part to the MCU circuit after calculation.

[0088] As shown in FIG. 8 and 11, the intelligent controller further comprises a current-voltage measurement circuit, which comprises a metering chip circuit and a current sampling part and a voltage sampling part connected to the metering chip circuit respectively, and the metering chip circuit is connected to the MCU circuit. Further, the current-voltage measurement circuit is connected to the MCU circuit through a serial communication, and the metering chip circuit transmits the data collected by the current sampling part and the voltage sampling part to the MCU circuit after calculation. Figure 8b As shown in FIG. 8 and 11, the intelligent controller further comprises a current-voltage measurement circuit, which comprises a metering chip circuit and a current sampling part and a voltage sampling part connected to the metering chip circuit respectively, and the metering chip circuit is connected to the MCU circuit. Further, the current-voltage measurement circuit is connected to the MCU circuit through a serial communication, and the metering chip circuit transmits the data collected by the current sampling part and the voltage sampling part to the MCU circuit after calculation.

[0089] The metering chip circuit, preferably a high-precision three-phase electric energy metering IC, adopts a serial interface, and is internally provided with a plurality of secondary sigma-delta type analog-to-digital converters (ADCs), digital integrators, reference voltage source circuits and all necessary signal processing circuits, and can realize total (fundamental and harmonic) active / reactive power measurement and effective value calculation, and fundamental active / reactive power measurement.

[0090] As shown in Figure 8c Fig. 7, which is an embodiment of the metering chip circuit: the metering chip is of ADE7880 type, the 7th-9th pins and the 12th-16th pins thereof are connected with four current sampling branches of the current sampling part, and the 18th, 19th, 22nd and 23rd pins thereof are connected with four voltage sampling branches of the voltage sampling part.

[0091] As shown in Figs. 10-11, the intelligent controller further comprises an environment monitoring module connected with the MCU circuit, which comprises a temperature and humidity sensing circuit, an atmospheric pressure measuring circuit and a dust detection circuit. The temperature and humidity sensing circuit takes a high-precision temperature measuring chip of HDC2010 type as the core and is connected to the MCU circuit through a serial port, the atmospheric pressure measuring circuit takes a chip of BMP180 type as the core and is connected to the MCU circuit through a serial port, and the dust measuring circuit detects the light intensity of a light source through a photoresistor to determine the dust state in the environment.

[0092] As shown in Figure 10aThe diagram shows an embodiment of the temperature and humidity sensing circuit: The temperature and humidity sensing circuit includes a chip HDC2010. The VDD pin of the HDC2010 chip is connected to a power supply, providing a voltage of 1.62 to 3.6V. The VDD pin is also connected to GND through a capacitor C56. The ADDR pin defines an address. A resistor R60 is connected in parallel between the VDD pin and the ADDR pin of the HDC2010 temperature and humidity digital sensor. The ADDR pin is also connected to GND through a resistor R61. The SDA pin and SCL pin are connected to the ports of the MCU circuit through pull-up resistors R68 and R69, respectively. The DRDY_INT pin is connected to the corresponding port of the MCU circuit. The GND pin is connected to GND. Furthermore, the temperature and humidity detection circuit is connected to the MCU circuit of the intelligent controller. The intelligent controller has a preset ambient temperature threshold, for example, an ambient temperature threshold of 40℃, which means the onboard temperature is 40℃. Taking a circuit breaker of model NA1-2000X-2000 as an example, the rated current In of the circuit breaker is 2000A. When the ambient temperature is below 40℃, the long-delay current protection value Ir in the protection parameters is 2000A. The MCU circuit obtains the ambient temperature parameter through the sampling signal of the temperature and humidity detection circuit, compares the ambient temperature parameter with the ambient temperature threshold to determine whether the ambient temperature is abnormal, and alarms are triggered through the HMI display module and communication module to prompt the user to manually adjust the long-delay current protection value Ir. Furthermore, if the long-delay current protection value Ir is not manually adjusted within a certain period of time, for example, within 5 to 60 minutes, the intelligent controller will adjust the long-delay current protection value Ir according to the derating factor corresponding to the current ambient temperature. For example, when the ambient temperature changes to 55℃, according to the derating factor corresponding to that ambient temperature, the long-delay current protection value Ir is 2000×0.9=1800A.

[0093] like Figure 10b The image shows one embodiment of the atmospheric pressure measurement circuit: the atmospheric pressure measurement circuit includes a BMP180M chip, and its communication method adopts I / O. 2The SDA pin and the SCL pin of the sensor are connected to the corresponding ports of the intelligent controller through pull-up resistors R7 and R8, respectively, in the I2C communication protocol. Further, the atmospheric pressure measurement circuit is connected to the MCU circuit of the intelligent controller, and a preset altitude threshold is provided in the intelligent controller, for example, the altitude threshold is 2000 meters. Taking a circuit breaker with a model of NA1-2000X-2000 as an example, the rated current In of the circuit breaker is 2000 A, and when the altitude is lower than 2000 meters, the long-time delay current protection value Ir in the protection parameter is 1000 A. The MCU circuit obtains the altitude parameter through the sampling signal of the atmospheric pressure measurement circuit, compares the altitude parameter with the altitude threshold to determine whether the operating altitude of the circuit breaker is abnormal, and alarms through the HMI display module and the communication module to prompt that the circuit breaker is in a non-safe working state. Further, if the long-time delay current protection value Ir is not manually adjusted within a certain time, for example, within 5-60 minutes, the intelligent controller adjusts the long-time delay current protection value Ir according to the derating coefficient corresponding to the current altitude parameter. For example, when the altitude becomes 3500 meters, the long-time delay current protection value Ir is adjusted to 2000*0.83=1660 A.

[0094] As shown in Figure 10c , it is an embodiment of the dust detection circuit: the dust detection circuit includes an LED light source H1, a photoresistor R6, and a heating resistor R4. The LED light source H1 and the photoresistor R6 are used to collect the scattered particle signals in the air, and the sampling airflow is driven by the heating resistor R4. During the sampling process, when the dust particles in the air increase, the LED light source H1 is blocked, the resistance of the photoresistor R6 decreases, and the AD sampling signal fed back to the intelligent controller also decreases, so that the intelligent controller obtains the corresponding dust concentration level according to the built-in parameters, and reminds the user to ventilate. Further, the photoresistor R6 has a capacitor C4 connected in parallel at both ends, one end of the photoresistor R6 is connected to the intelligent controller to feed back the sampling signal, the other end of the photoresistor R6 is connected to GND, and one end of the LED light source H1 is connected to the intelligent controller through a resistor R5, and the intelligent controller controls the LED light source H1 to emit light.

[0095] As shown in Figure 11 , the universal circuit breaker further includes a position monitoring module for detecting the working position of the circuit breaker body 1. The circuit breaker body 1 has three working positions, which are a connection position, a test position and a separation position arranged in sequence. Further, the position monitoring module is connected to the intelligent controller through RS485.

[0096] The position monitoring module can be realized by existing technologies, for example, the technical solution of Chinese patent CN211579947U can be used, which will not be described here.

[0097] As Figure 11 shown, the universal circuit breaker further comprises an accessory detection module, which comprises an under-voltage monitoring circuit, a split excitation monitoring circuit, a closing monitoring circuit and a motor monitoring circuit for detecting the under-voltage release, the split excitation release, the closing electromagnet and the energy storage motor of the universal circuit breaker respectively. Further, the accessory detection module is connected with the intelligent controller through RS485.

[0098] The accessory detection module can be realized by existing technologies, for example, the technical solution of Chinese patent CN201922215425.5, which will not be described here.

[0099] The intelligent controller calculates the contact wear rate of the universal circuit breaker by the following method:

[0100] η(n)=1 / [(In / I(n))^α*Le]

[0101] η=[η(1)+η(2)+…η(n)]

[0102] Wherein, η(n) is the single tripping wear rate, the minimum value is the inverse of mechanical life; η is the total contact wear rate; In is the rated current; I(n) is the tripping current; α is the coefficient, which is a constant; Le is the product electrical life, which is a constant.

[0103] The intelligent controller calculates the thermal aging rate of the universal circuit breaker by the following method:

[0104] R=1-(N-(I / 0.8In)^2*(W / 40)^2*D) / N

[0105] Wherein, R is the thermal aging rate of the universal circuit breaker; N is the design depreciation days; I is the daily average current; W is the operating environment temperature of the universal circuit breaker; D is the cumulative running days.

[0106] The intelligent controller calculates the health degree of the universal circuit breaker by the following method:

[0107] H=min[(1-R*100),(1-η*100)]

[0108] Wherein, H is the health degree of the universal circuit breaker; R is the thermal aging rate of the circuit breaker; η is the contact wear rate.

[0109] The following is an example of calculating the contact wear rate:

[0110] Assuming that the rated current of the universal circuit breaker is 1000A, the tripping current is 2000A, the coefficient a is 2, and the product electrical life Le is 10000;

[0111] The contact wear rate of one opening is:

[0112] η(1) = 1 / (((1000 / 2000)2) * 10000) = 0.04%

[0113] The contact wear rate of one opening is:

[0114] The total contact wear rate after two openings is: η = η(1) + η(2) = 0.08%

[0115] The following is a calculation example of the thermal aging rate and health degree:

[0116] Assume that the design depreciation day N is 5000 days, the daily average current I is 1000A, the rated current is 1000A, the environmental operating temperature is 40℃, and the cumulative operation is 1000 days.

[0117] R = 1-(5000-(1000 / 1600)^2*(40 / 40)^2*1000) / 5000 = 7.81%

[0118] H = 1-0.0781 = 92.19%

[0119] It should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings or the orientation or positional relationship commonly used when in use, and are only for the convenience of description, and cannot be understood as indicating that the device or element referred to must have a particular orientation, therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating relative importance.

[0120] The above is a further detailed description of the present application in combination with specific preferred embodiments, and cannot be considered as limiting the specific implementation of the present application to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, a number of simple deductions or replacements can be made without departing from the concept of the present application, and all should be considered as falling within the protection scope of the present application.

Claims

1. A universally sensing circuit breaker, characterized in that: The fully sensing universal circuit breaker includes a circuit breaker body (1) and a control system. The control system includes an intelligent controller (2). The intelligent controller (2) includes an MCU circuit and a circuit breaker self-test module connected to the MCU circuit. The circuit breaker self-test module includes: The current sampling circuit includes a transformer disconnection detection circuit for detecting the connection status of the air-core transformer of the universal circuit breaker. Iron core transformer operating current detection circuit used to monitor the output current of the iron core transformer of a universal circuit breaker. A flux trip open circuit for detecting the connection status of the flux trip unit of the actuator of a universal circuit breaker. An auxiliary power supply voltage detection circuit is used to detect the input status of the auxiliary power supply that powers the short-circuit protection mechanism of a universal circuit breaker. An energy storage readiness detection circuit for detecting the energy storage status of the energy storage operating mechanism of a universal circuit breaker. Tripping status detection circuit for detecting the tripping status of universal circuit breakers; The intelligent controller calculates the contact wear rate of the universal circuit breaker using the following method: η(n) = 1 / [(In / I(n))^α*Le] η = [η(1) + η(2) + ... + η(n)] Where η(n) is the wear rate of a single trip, the minimum value of which is the reciprocal of the mechanical life; η is the total contact wear rate; In is the rated current; I(n) is the tripping current; α is a coefficient, which is a constant; Le is the electrical life of the product, which is a constant. The intelligent controller calculates the thermal aging rate of the universal circuit breaker using the following method: R=1-(N-(I / 0.8In)^2*(W / 40)^2*D) / N Where R is the thermal aging rate of the universal circuit breaker; N is the design depreciation days; I is the average daily operating current; W is the ambient temperature of the universal circuit breaker; and D is the cumulative number of operating days. The intelligent controller calculates the health status of the universal circuit breaker using the following method: H = min[(1-R*100),(1-η*100)] Where H represents the health status of the universal circuit breaker.

2. The universally sensing circuit breaker according to claim 1, characterized in that: The current sampling circuit also includes a current processing circuit, which includes an integrator circuit and an amplifier circuit, to process the signal from the hollow current transformer and transmit it to the MCU circuit.

3. The universal sensing circuit breaker according to claim 1, characterized in that: The operating current detection circuit of the iron core transformer is connected to the AD sampling port of the MCU circuit, converting the output current signal of the iron core transformer into a voltage signal and transmitting it to the MCU circuit through the AD sampling port.

4. The universally sensing circuit breaker according to claim 1, characterized in that: The magnetic flux trip open circuit includes diodes D6 and D8, resistors R1 and R2, and comparator U4A. The cathodes of diodes D6 and D8 are connected together, the anode of diode D8 is connected to one end of resistor R1, the other end of resistor R1 is connected to one end of resistor R2, and the other end of resistor R2 is connected to the positive input terminal of comparator U4A. The nodes between diodes D6 and D8 and between diode D8 and resistor R1 are respectively connected to the magnetic flux coil.

5. The universally sensing circuit breaker according to claim 1, characterized in that: The auxiliary power supply voltage detection circuit is connected to the AD sampling port of the MCU circuit. After performing resistor voltage division and power supply filtering on the auxiliary power supply, it is sent to the MCU circuit.

6. The universally sensing circuit breaker according to claim 1, characterized in that: The circuit breaker self-test module also includes a busbar temperature acquisition circuit for detecting the internal busbar temperature of the universal circuit breaker.

7. The universally sensing circuit breaker according to claim 1, characterized in that: The universal circuit breaker also includes a position monitoring module for detecting the working position of the circuit breaker body (1).

8. The universally sensing circuit breaker according to claim 1, characterized in that: The intelligent controller also includes a current and voltage measurement circuit, which includes a metering chip and a current sampling section and a voltage sampling section respectively connected to the metering chip. The metering chip is connected to the MCU circuit.

9. The universal sensing circuit breaker according to claim 1, characterized in that: The universal circuit breaker also includes an accessory detection module, which includes an undervoltage monitoring circuit, a shunt tripping circuit, a closing monitoring circuit, and a motor monitoring circuit that respectively detect the undervoltage tripping device, the shunt tripping device, the closing electromagnet, and the energy storage motor of the universal circuit breaker.

10. The universal sensing circuit breaker according to claim 1, characterized in that: The intelligent controller also includes an environmental monitoring module connected to the MCU circuit. The environmental monitoring module includes a temperature and humidity sensing circuit, an atmospheric pressure measurement circuit, and a dust detection circuit.

11. The universally sensing circuit breaker according to claim 1, characterized in that: The intelligent controller (2) includes an interface board (21), a power board (22), a control board (23), an MCR protection board (24), a wireless communication module (25), and a liquid crystal display module (26).

12. The universally sensing circuit breaker according to claim 11, characterized in that: The intelligent controller also includes a controller housing, which includes a transparent long door that extends to the button area and is equipped with a lock structure.

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