Intelligent reclosing circuit breaker and power distribution system

Abstract

The utility model discloses an intelligent reclosing circuit breaker and a power distribution system, a protection current input unit in the circuit breaker is used for accessing a protection current obtained by a protection current sensing device, and a protection isolation power supply unit provides a main power supply for a main power supply line according to the protection current. The auxiliary power supply unit provides an auxiliary power supply for the main power supply line. And the positive code communication unit is used for carrying out remote communication signal mutual transmission between the external communication equipment and the micro-control unit. The micro-control unit controls the working state of the circuit breaker body according to the remote communication signal; the main power supply circuit provides a first voltage source for the micro-control unit and the circuit breaker body; and the auxiliary power supply unit also provides a second voltage source for the positive code communication unit and provides a third voltage source for the circuit breaker body, so that dual power supply of the circuit breaker is realized, the problem of failure of remote control when a main loop is powered off is solved, and the degree of dependence of the intelligent reclosing circuit breaker on manpower is reduced.

Description

Technical Field

[0001] The utility model relates to the field of power systems, and particularly to an intelligent reclosing circuit breaker and a power distribution system. Background Art

[0002] Intelligent reclosing circuit breakers are widely used in distribution networks to control and protect various loads. With the development of power systems, such intelligent reclosing circuit breakers are widely used in many areas with underdeveloped transportation to achieve remote communication control of the power supply on-off of electrical loads.

[0003] At present, the intelligent reclosing circuit breakers on the market all use the electrical signals on the main circuit to drive the opening and closing functions. When the main circuit is de-energized, the power supply of the intelligent reclosing circuit breaker is interrupted, and remote opening and closing cannot be achieved, which greatly increases the dependence of the intelligent reclosing circuit breaker on manual operation. Summary of the Utility Model

[0004] The utility model provides an intelligent reclosing circuit breaker and a power distribution system to solve the problem of remote control failure when the main circuit is powered off and reduce the dependence of the intelligent reclosing circuit breaker on manual operation.

[0005] According to one aspect of the utility model, an intelligent reclosing circuit breaker is provided. The intelligent reclosing circuit breaker includes a protection current input unit, a protection isolation power supply unit, a micro-control unit, an auxiliary power supply unit, a positive code communication unit, and a circuit breaker body;

[0006] The protection current input unit is externally connected to a protection current sensing device arranged on the main circuit, and the protection current input unit is used to access the protection current obtained by the protection current sensing device;

[0007] The input end of the protection isolation power supply unit is connected to the protection current input unit, and the output end of the protection isolation power supply unit is connected to the main power supply line. The protection isolation power supply unit is used to provide the main power supply for the main power supply line;

[0008] The input end of the auxiliary power supply unit is externally connected to an auxiliary power supply, and the output end of the auxiliary power supply unit is connected to the main power supply line. The auxiliary power supply unit provides a secondary power supply for the main power supply line;

[0009] The positive code communication unit is respectively connected to an external communication device and the micro-control unit, and the positive code communication unit is used to perform mutual transmission of remote communication signals between the external communication device and the micro-control unit;

[0010] The micro-control unit is also connected to the circuit breaker body, and the micro-control unit is used to control the working state of the circuit breaker body according to the remote communication signal;

[0011] The main power supply line is respectively connected to the micro control unit and the circuit breaker body, and provides a first voltage source for the micro control unit and the circuit breaker body;

[0012] The auxiliary power supply unit is also connected to the positive code communication unit and the circuit breaker body, and the auxiliary power supply unit is also used to provide a second voltage source for the positive code communication unit and a third voltage source for the circuit breaker body.

[0013] Optionally, the circuit breaker body includes a motor and a relay;

[0014] One end of the motor is connected to the third voltage source, the other end is grounded through the relay, and the control end of the relay is connected to the micro control unit;

[0015] The micro control unit is also used to adjust the working state of the motor by controlling the on-off of the relay, and the motor is used to drive a transmission device to make the circuit breaker complete opening and closing.

[0016] Optionally, the circuit breaker body further includes a position switch and a release;

[0017] The position switch is connected to the micro control unit, and the position switch is used to feed back the switch position signal of the circuit breaker to the micro control unit;

[0018] The release is connected to the micro control unit, and the release is used to release the holding mechanism according to the protection control signal of the micro control unit, so that the main circuit where the circuit breaker is located is disconnected;

[0019] The position switch and the release are powered by the first voltage source and the third voltage source.

[0020] Optionally, the positive code communication unit includes a first opto-isolator, a second opto-isolator, a third opto-isolator, a common mode inductor and an RS485 transceiver chip;

[0021] The input end of the first opto-isolator is connected to the receiver output end RO of the RS485 transceiver chip, and its output end is connected to the micro control unit;

[0022] The input end of the second opto-isolator is connected to the micro control unit, and its output end is respectively connected to the receive enable end REB and the transmit enable end DE of the RS485 transceiver chip;

[0023] The input end of the third opto-isolator is connected to the micro control unit, and its output end is connected to the driver input end DI of the RS485 transceiver chip;

[0024] One end of the first side of the common-mode inductor is connected to the transmit differential signal terminal of the RS485 transceiver chip, and the other end of the first side of the common-mode inductor is connected to its corresponding external communication port;

[0025] One end of the second side of the common-mode inductor is connected to the receive differential signal terminal of the RS485 transceiver chip, and the other end of the second side of the common-mode inductor is connected to its corresponding external communication port.

[0026] Optionally, the intelligent reclosing circuit breaker further includes: a protection current amplification unit;

[0027] The protection current amplification unit is connected to the protection current input unit, and the protection current amplification unit is used to perform amplification processing on the protection current;

[0028] The micro-control unit is also connected to the protection current amplification unit, and the micro-control unit is also used to control the working state of the circuit breaker body according to the amplified protection current.

[0029] Optionally, the intelligent reclosing circuit breaker further includes: a metering unit;

[0030] The metering unit is connected to the main circuit, and the metering unit is used to determine metering parameters according to the electrical parameters on the main circuit;

[0031] The micro-control unit is connected to the metering unit, and the micro-control unit is also used to control the working state of the circuit breaker body according to the metering parameters.

[0032] Optionally, the metering unit includes: a line voltage input circuit, a metering current input circuit, and a metering electrical parameter acquisition circuit;

[0033] The input end of the line voltage input circuit is externally connected to the main circuit, and the line voltage input circuit is used to access the line voltage on the main circuit;

[0034] The input end of the metering current input circuit is externally connected to a metering current acquisition device arranged on the main circuit, and the metering current input circuit is used to access the metering current obtained by the metering current acquisition device;

[0035] The metering electrical parameter acquisition circuit is respectively connected to the output end of the line voltage input circuit, the output end of the metering current input circuit, and the micro-control unit. The metering electrical parameter acquisition circuit is used to determine the metering parameters of the main circuit according to the line voltage and the metering current and feedback them to the micro-control unit.

[0036] Optionally, the intelligent reclosing circuit breaker further includes: an interaction unit, the interaction unit is connected to the micro-control unit, and the interaction unit is used to realize human-computer interaction.

[0037] Optionally, the interaction unit includes a display device, an indicator light, and an input device;

[0038] The display device, the indicator light, and the input device are respectively connected to the micro-control unit. The display device is used to display the measurement parameters and / or the status of the circuit breaker body;

[0039] The indicator light is used to indicate the working status of the intelligent reclosing circuit breaker;

[0040] The input device is used to input a control signal, where the control signal is used to set and view relevant parameters.

[0041] According to another aspect of the present invention, a power distribution system is provided, which includes the intelligent reclosing circuit breaker according to any one of the first aspect.

[0042] In the intelligent reclosing circuit breaker and the power distribution system proposed by the present invention, the protection current input unit in the circuit breaker is used to access the protection current obtained by the protection current sensing device, and the protection isolation power supply unit provides the main power supply for the main power supply line according to the protection current. The auxiliary power supply unit provides a secondary power supply for the main power supply line. The positive code communication unit is used to mutually transmit remote communication signals between the external communication device and the micro-control unit. The micro-control unit controls the working status of the circuit breaker body according to the remote communication signal; the main power supply line provides a first voltage source for the micro-control unit and the circuit breaker body; the auxiliary power supply unit also provides a second voltage source for the positive code communication unit and a third voltage source for the circuit breaker body, realizing dual power supply of the circuit breaker, solving the problem of remote control failure when the main circuit is powered off, and reducing the dependence of the intelligent reclosing circuit breaker on manual operation.

[0043] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. Description of the Drawings

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0045] Figure 1 It is a schematic diagram of the composition of an intelligent reclosing circuit breaker provided for the embodiments of the present invention;

[0046] Figure 2 Schematic diagram of a circuit for protecting a current input unit and a protection isolation power supply unit provided by an embodiment of the present utility model;

[0047] Figure 3 Schematic diagram of a circuit for an auxiliary power supply unit provided by an embodiment of the present utility model;

[0048] Figure 4 Schematic diagram of a circuit for a positive code communication unit provided by an embodiment of the present utility model;

[0049] Figure 5 Another composition schematic diagram of an intelligent reclosing circuit breaker provided by an embodiment of the present utility model;

[0050] Figure 6 Schematic diagram of a circuit for setting a position switch and its surrounding circuit provided by an embodiment of the present utility model;

[0051] Figure 7 Schematic diagram of a circuit for a trip unit and its surrounding circuit provided by an embodiment of the present utility model;

[0052] Figure 8 Schematic diagram of a circuit for a motor and its control circuit provided by an embodiment of the present utility model;

[0053] Figure 9 Another composition schematic diagram of an intelligent reclosing circuit breaker provided by an embodiment of the present utility model;

[0054] Figure 10 Schematic diagram of a circuit for a protection current amplification unit provided by an embodiment of the present utility model;

[0055] Figure 11 Another composition schematic diagram of an intelligent reclosing circuit breaker provided by an embodiment of the present utility model;

[0056] Figure 12 Another composition schematic diagram of an intelligent reclosing circuit breaker provided by an embodiment of the present utility model;

[0057] Figure 13 Schematic diagram of a circuit for a line voltage input circuit and a metering current input circuit provided by an embodiment of the present utility model;

[0058] Figure 14 Schematic diagram of a circuit for a metering electrical parameter acquisition circuit provided by an embodiment of the present invention;

[0059] Figure 15 Another composition schematic diagram of an intelligent reclosing circuit breaker provided by an embodiment of the present utility model;

[0060] Figure 16A circuit schematic diagram of a display device and an indicator light provided by an embodiment of the present utility model;

[0061] Figure 17 A composition schematic diagram of a power distribution system provided by an embodiment of the present utility model. Detailed implementation manners

[0062] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0063] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model and the above accompanying drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0064] In order to solve the problems in the background technology, the present application proposes an intelligent reclosing circuit breaker. Figure 1 A composition schematic diagram of an intelligent reclosing circuit breaker provided by an embodiment of the present utility model. In the figure, the solid arrows in the intelligent reclosing circuit breaker represent the signal transmission direction, the dashed arrows represent the power supply transmission direction, and the thick coil shows the main power supply line, and this power supply line provides a voltage source of at least one voltage level for the connected electrical appliances and the micro control unit. Refer to Figure 1, the intelligent reclosing circuit breaker 100 includes a protection current input unit 101, a protection isolation power supply unit 102, a micro control unit 103, an auxiliary power supply unit 104, a positive code communication unit 105 and a circuit breaker body 106. The protection current input unit 101 is externally connected to a protection current sensing device arranged on the main circuit. The protection current input unit 101 is used to access the protection current obtained by the protection current sensing device. The input end of the protection isolation power supply unit 102 is connected to the protection current input unit 101, and the output end of the protection isolation power supply unit 102 is connected to the main power supply line 107. The protection isolation power supply unit 102 is used to provide the main power supply for the main power supply line 107. The input end of the auxiliary power supply unit 104 is externally connected to an auxiliary power supply, and the output end of the auxiliary power supply unit 104 is connected to the main power supply line 107. The auxiliary power supply unit 104 provides a secondary power supply for the main power supply line 107. The positive code communication unit 105 is respectively connected to an external communication device and the micro control unit 103. The positive code communication unit 105 is used for mutual transmission of remote communication signals between the external communication device and the micro control unit 103. The micro control unit 103 is also connected to the circuit breaker body 106. The micro control unit 103 is used for remote communication signals to control the working state of the circuit breaker body 106. The main power supply line 107 is respectively connected to the micro control unit 103 and the circuit breaker body 106 to provide a first voltage source for the micro control unit 103 and the circuit breaker body 106. Among them, the first voltage source may include the main power supply and the secondary power supply, and may also include other voltage sources generated after step-up or step-down processing of the main power supply or the secondary power supply. The auxiliary power supply unit 104 is also connected to the positive code communication unit 105 and the circuit breaker body 106. The auxiliary power supply unit 104 is also used to provide a second voltage source for the positive code communication unit 105 and a third voltage source for the circuit breaker body 106.

[0065] Specifically, the main circuit refers to the controlled circuit corresponding to the intelligent reclosing circuit breaker 100 for controlling on and off, which is a three-phase circuit. A protection current sensing device is arranged thereon to obtain the protection current of the main circuit. Exemplarily, the protection current sensing device may include a protection transformer. The protection current input unit 101 is a protection current access component or circuit, externally connected to the protection current sensing device arranged on the main circuit, and connected to the protection current sensing device to access the secondary current (i.e., the protection current) of the protection current sensing device, and rectify the secondary current into a corresponding DC signal. Exemplarily, the protection current input unit 101 may include at least three rectifier bridges to achieve AC-DC conversion. The protection isolation power supply unit 102 refers to a power generation component or circuit, connected to the protection current input unit 101, and performs operations such as isolation, voltage stabilization, and operation on the protection current accessed and rectified by the protection current input unit 101 to generate a stable main power supply.

[0066] Exemplarily, Figure 2A circuit schematic diagram of a protection current input unit and a protection isolation power supply unit provided by an embodiment of the present invention, in combination with Figure 1 and Figure 2 , the secondary current output by the externally connected protection mutual inductor is connected to the protection current input unit 101 through the protection terminal J2. The three-phase secondary currents are rectified by the rectifier bridges B1, B2, and B3 respectively. The output negative terminals of the rectifier bridges are connected to the working ground terminal AGND through their corresponding current protection sampling resistors. The output positive terminals of the three rectifier bridges are respectively connected to the overvoltage protection TVS tube D23 and at the same time are respectively connected to the input end of the power inductor L5. The power inductor L5 performs constant current filtering on the passing current. The output end of the power inductor L5 is connected in series with the diode D22 to ensure unidirectional output. The output end of the diode D22 is the main power supply +12V output by the protection isolation power supply unit 102. The main power supply +12V also sequentially passes through the feedback sampling resistor R98 and the feedback sampling resistor R102 and then is connected to the working ground terminal AGND. The connection point of the feedback sampling resistor R98 and the feedback sampling resistor R102 is connected to the positive input terminal of the comparator U15. The negative input of the comparator U15 is connected to the reference voltage Vref_1. Among them, the reference voltage Vref_1 is a 2.5V voltage generated after the main power supply +12V is processed by the current limiting resistor R22, the voltage stabilizing tube U16, and the filter capacitor C27. The output terminal PWM_FB of the comparator U15 is respectively connected to the control terminal of the switching tube Q12, the pull-up resistor R101, and the pull-down resistor R75. The diode D24 is arranged between the input end of the power inductor L5 and the input end of the switching tube Q12. The output end of the switching tube Q12 is connected to the working ground terminal AGND. When the main power supply +12V is less than the standard working voltage of 12V, that is, the voltage at the positive input terminal of the comparator U15 is less than the reference voltage Vref_1, the output terminal PWM_FB of the comparator U15 outputs a low level, the switching tube Q12 is turned off, and the currents output by the three rectifier bridges are all supplied to the main power supply +12V through the power inductor L5 and the diode D22, and the voltage of the main power supply +12V rises. When the main power supply +12V is greater than the standard working voltage of 12V, that is, the voltage at the positive input terminal of the comparator U15 is greater than the reference voltage Vref_1, the output terminal PWM_FB of the comparator U15 outputs a high level, the switching tube Q12 is turned on, and the currents output by the three rectifier bridges are short-circuited by the diode D24 and the switching tube Q12, and the voltage of the main power supply +12V drops.

[0067] The auxiliary power supply unit 104 refers to a circuit or component that uses an external auxiliary power supply to supply power to the electrical appliances in the intelligent reclosing circuit breaker 100. The auxiliary power supply unit 104 can step down and isolate the external auxiliary power supply to generate a secondary power supply and provide it to the main power supply line 107; it can also generate a third voltage source from the external auxiliary power supply through an anti-fool protection circuit and supply it to the circuit breaker body 106; it can also step down and isolate the external auxiliary power supply to generate a second voltage source and supply it to the positive code communication unit 105. Exemplarily, the auxiliary power supply unit 104 can include a rectifier bridge, a transformer, and a switch power control chip, and the external auxiliary power supply can include a storage battery pack.

[0068] Exemplarily, Figure 3 is a schematic circuit diagram of an auxiliary power supply unit provided by an embodiment of the present invention. Combining Figure 1 and Figure 3, a resistor protection device RV1 and an inductor protection device CX1 are connected in parallel between two external input ports Y+24V and YGND of the auxiliary power supply unit 104. The two external input ports Y+24V and YGND of the auxiliary power supply unit 104 are also respectively connected to two input terminals of a rectifier bridge BR1. The two input terminals of the rectifier bridge BR1 have an anti-fooling function, and the forward and reverse connections do not affect the circuit function. The positive output terminal of the rectifier bridge BR1 is connected to the first end of a current-limiting resistor R131, and the second end of the resistor R131 is used as the connection terminal of the third voltage source +24V, which can directly supply power to the motor in the circuit breaker body 106. A filter capacitor CE3, a protection TVS tube D16, and a protection TVS tube D17 are connected in parallel between the third voltage source +24V and the power ground terminal GNDin. The third voltage source +24V is also connected to the input terminal of a power inductor L2. A filter capacitor C91 is connected between the output terminal of the power inductor L2 and the power ground terminal GNDin. The primary input terminal of a high-frequency transformer Tp is connected to the output terminal of the power inductor L2. An accelerating discharge branch composed of a resistor R145, an inductor C87, and a diode D14 is connected between the primary input terminal and the primary output terminal of the high-frequency transformer Tp. The primary output terminal of the high-frequency transformer Tp is also connected to the input terminal of a switching transistor Q11. The output terminal of the switching transistor Q11 is connected to the power ground terminal GNDin through a parallel combination of a current sampling resistor R141, a current sampling resistor R142, and a current sampling resistor R143. The working power supply of the switching power supply control chip U7 has three-terminal inputs: one is provided by the feedback output terminal of the high-frequency transformer Tp, and is input to the switching power supply control chip U7 after half-wave rectification by a resistor R133 and a diode D12; the second is provided by the output terminal of the power inductor L2, and is input to the switching power supply control chip U7 after voltage stabilization by a diode D11, a resistor R128, and a three-terminal voltage regulator U5 to ensure power supply stability; the third is provided by the connection point between a resistor R132 and a resistor R134, and is input to the power supply terminal of the switching power supply control chip U7 through a diode D18 and a step-down resistor R23 to improve the startup time of the switching power supply control chip U7. The resistor R134 is also respectively connected to the power ground terminal GNDin through a resistor R122 and a capacitor C85. The switching power supply control chip U7 controls the signal at the output terminal according to the connected input conditions. The output terminal of the switching power supply control chip U7 is connected to the control terminal of the switching transistor Q11 through a resistor R135 to control the conduction and cut-off of the switching transistor Q11. The control terminal of the switching transistor Q11 is also sequentially connected to a terminal CS through a resistor R144 and a resistor R136. The terminal CS is connected to the power ground terminal GNDin through a capacitor C34 and is also connected to the switching power supply control chip U7 to feedback the state of the switching transistor Q11 to the switching power supply control chip U7.

[0069] The electrical signal output from the secondary output pin of the high-frequency transformer Tp, after half-wave rectification by the diode D9, uses the inductor C94 and the first common-mode inductor L6 to remove high-frequency interference in the electrical signal, and then uses the capacitor CE1, the inductor L3, and the capacitor C89 to perform π-type filtering on the electrical signal. After reducing the output ripple, the connection terminal of the output intermediate power supply +12V_D is obtained. A capacitor C31 and a load resistor R130 are connected in parallel between the intermediate power supply +12V_D and the secondary ground terminal DGND to improve the output stability of the intermediate power supply +12V_D and the secondary power supply +12V1 when the switching power supply is unloaded. The intermediate power supply +12V_D is also connected to the feedback sampling circuit. The feedback sampling circuit is provided with a voltage regulator tube U9, a fourth optocoupler isolator U8, multiple resistors and capacitors, and feeds back the intermediate power supply +12V_D to the switching power supply control chip U7 through the interface FB. The intermediate voltage +12V_D is connected to the secondary power supply +12V1 through the diode D10. When the secondary power supply +12V1 is greater than or equal to 11.7V, the diode D10 is cut off, and the externally connected auxiliary power supply is in an unloaded state, that is, the intermediate power supply +12V_D only drives the load resistor R130, reducing the power supply energy consumption of the auxiliary power supply. When the secondary power supply +12V1 is less than 11.7V, the diode D10 conducts, the externally connected auxiliary power supply is in a loaded state, and the voltage of the secondary power supply +12V1 is pulled to be close to about 11.7V. The electrical signal output from the secondary auxiliary output pin of the high-frequency transformer Tp, after half-wave rectification by the diode D15, and the voltage stabilization effect of the current-limiting resistor R139 and the voltage regulator tube ZD1, after filtering by the capacitor C90, the capacitor C29, and the capacitor C30, generates the second voltage source +5V_RS485 for the positive code communication unit 105 to use. Among them, the voltage level of the secondary power supply is the same as that of the main power supply in other drawings and can be shown with the same reference numeral.

[0070] The positive code communication unit 105 is a component or circuit for remote serial communication. One side of the positive code communication unit 105 is connected to an external communication device, and the other side is connected to the micro-control unit 103, which can realize remote communication between the micro-control unit 103 and the external communication device. Exemplarily, the positive code communication unit 105 may include an RS485 transceiver chip. The positive code communication unit 105 is powered by the second voltage source provided by the auxiliary power supply unit 104. In the case of a power failure in the main circuit, the second voltage source provided by the auxiliary power supply unit 104 is normally powered, which can ensure the signal transmission between the circuit breaker and the remote communication, and realize the remote control of the circuit breaker in the case of a power failure in the main circuit.

[0071] Exemplarily, Figure 4 The circuit schematic diagram of a positive code communication unit provided by an embodiment of the present invention is combined with Figure 1 and Figure 4, on the basis of the foregoing embodiments, the positive code communication unit 105 includes a first optocoupler isolator U1, a second optocoupler isolator U3, a third optocoupler isolator U4, a common mode inductor L1, and an RS485 transceiver chip U2. The input end of the first optocoupler isolator U1 is connected to the receiver output end RO of the RS485 transceiver chip U2, and the output end of the first optocoupler isolator U1 is connected to the micro control unit 103. The input end of the second optocoupler isolator U3 is connected to the micro control unit 103, and the output end of the second optocoupler isolator U3 is respectively connected to the receive enable end REB and the transmit enable end DE of the RS485 transceiver chip U2. The input end of the third optocoupler isolator U4 is connected to the micro control unit 103, and the output end of the third optocoupler isolator U4 is connected to the driver input end DI of the RS485 transceiver chip U2. The input end of the first side of the common mode inductor L1 is connected to the transmit differential signal end of the RS485 transceiver chip, and the output end of the first side of the common mode inductor L1 is connected to its corresponding external communication port B1. The input end of the second side of the common mode inductor L1 is connected to the receive differential signal end of the RS485 transceiver chip, and the output end of the second side of the common mode inductor L1 is connected to its corresponding external communication port A1.

[0072] Continuing to combine Figure 1 and Figure 4 , when the positive code communication unit 105 is in the state of waiting to receive, the interface 485RDE (connected to the micro control unit 103) is at a high level, the second optocoupler isolator U3 is not turned on, the switching transistor Q9 is not turned on, the receive enable end REB and the transmit enable end DE of the RS485 transceiver chip U2 are at a high level, and the RS485 transceiver chip U2 is in the on state.

[0073] When the RS485 transceiver chip U2 receives a data signal, the receiver output end RO of the RS485 transceiver chip U2 is at a high level, and the first optocoupler isolator U1 is not turned on. Through the resistor R52 connected to the secondary ground terminal DGND, the potential of the output end of the first optocoupler isolator U1 is pulled down, so that the switching transistor Q8 is cut off, and a high level is generated at the remote ground end of the switching transistor Q8 and sent to the interface 485RXD through the resistor R44 to be output to the micro control unit 103.

[0074] When the positive code communication unit 105 sends valid data, the interface 485TXD outputs a high level, the third optocoupler isolator U4 is not turned on, one end of the resistor R54 is connected to the communication ground terminal GND485, and the potential of the other end of the resistor R54 can be pulled down to make the switching transistor Q10 cut off. A high level is generated at the remote ground end of the switching transistor Q10 through the resistor R37 and is input to an output end of the third optocoupler isolator U4 to send data to the RS485 transceiver chip U2. The capacitors C46, C47, and C48 are respectively used to accelerate the turning on of the switching transistors Q8, Q9, and Q10 to improve the data transmission performance.

[0075] The circuit breaker body 106 refers to a component used to directly control the on / off of the corresponding main circuit. Exemplarily, the circuit breaker body 106 may include a motor, a position switch, and a release. The motor drives the movement of the transmission device according to the control of the micro control unit 103 to realize the opening and closing actions of the circuit breaker. Three position switches may be provided, respectively arranged at different stroke positions of the moving contact of the circuit breaker, for obtaining the switch position signal of the circuit breaker and feeding it back to the micro control unit 103. The release can release the holding mechanism according to the protection control signal of the micro control unit 103, so that the main circuit where the circuit breaker is located is quickly disconnected. In the circuit breaker body 106, there are components powered by the third voltage source +24V and components powered by the first voltage source, enabling components with different voltage levels to correspond to different voltage sources. The setting of the auxiliary power supply unit 104 enables the circuit breaker to still normally complete the opening and closing even when the main circuit is powered off.

[0076] In the intelligent reclosing circuit breaker provided in this embodiment, the protection current input unit is externally connected to the protection current sensing device provided on the main circuit. The input end of the auxiliary power supply unit is externally connected to the auxiliary power supply, and the output end of the auxiliary power supply unit is connected to the main power supply line. The positive code communication unit is respectively connected to the external communication device and the micro control unit. The micro control unit is also connected to the circuit breaker body and controls the working state of the circuit breaker body according to the remote communication signal; the main power supply line is respectively connected to the micro control unit and the circuit breaker body to provide the first voltage source for the micro control unit and the circuit breaker body; the auxiliary power supply unit is also connected to the positive code communication unit and the circuit breaker body to provide the second voltage source for the positive code communication unit and the third voltage source for the circuit breaker body, realizing dual power supply for the circuit breaker, solving the problem of remote control failure when the main circuit is powered off, and reducing the dependence of the intelligent reclosing circuit breaker on manual operation.

[0077] Optionally, Figure 5 FIG. is a schematic diagram of the composition of another intelligent reclosing circuit breaker provided in an embodiment of the present invention. On the basis of the foregoing embodiment, with reference to Figure 5 , the circuit breaker body 106 includes a motor P2 and a relay. One end of the motor P2 is connected to the third voltage source, and the other end is grounded through the relay. The control end of the relay is connected to the micro control unit 103. The micro control unit 103 is also used to adjust the working state of the motor P2 by controlling the on / off of the relay. The motor P2 is used to drive the transmission device to make the circuit breaker complete the opening and closing.

[0078] Continue to refer to Figure 5, the circuit breaker body 106 further includes a position switch 202 and a release mechanism P1; the position switch 202 is connected to the micro control unit 103, and the position switch 202 is used to feed back the switch position signal of the circuit breaker to the micro control unit 103. The release mechanism P1 is connected to the micro control unit 103, and the release mechanism P1 is used to release the holding mechanism according to the protection control signal of the micro control unit 103, so as to disconnect the main circuit where the circuit breaker is located. The position switch 202 and the release mechanism P1 are powered by a first voltage source and a third voltage source.

[0079] Specifically, the motor P2 switches its working state according to the control signal of the micro control unit 103, drives the movement of the transmission device correspondingly, and realizes the opening and closing actions of the circuit breaker. Three position switches 202 can be set, which are respectively set at different stroke positions of the moving contact of the circuit breaker, and are used to obtain the switch position signal of the circuit breaker and feed it back to the micro control unit 103. The release mechanism P1 can release the holding mechanism according to the protection control signal of the micro control unit 103, so as to quickly disconnect the main circuit where the circuit breaker is located. There are components powered by the third voltage source and components powered by the first voltage source in the circuit breaker body 106, so that components with different voltage levels correspond to different voltage sources. The setting of the auxiliary power supply unit 104 enables the circuit breaker to still complete the opening and closing normally when the main circuit is powered off.

[0080] Exemplarily, Figure 6 is a schematic circuit diagram of the setting of a position switch and its surrounding circuit provided by an embodiment of the present invention. Combining Figure 5 and Figure 6 , the switch J3, the switch J4 and the switch P14 are three position switches 202 respectively set at different positions on the movement stroke of the relay transmission device. The position signals generated by the three position switches 202 are respectively connected to the micro control unit 103, which can indicate the current state of the circuit breaker. The micro control unit 103 can switch the control mode of the circuit breaker body 106 according to the position signal.

[0081] Figure 7 is a schematic circuit diagram of a release mechanism and its surrounding circuit provided by an embodiment of the present invention. Combining Figure 5 and Figure 7 , the function of the release mechanism P1 is to control the circuit breaker to trip. The working power supply of the release mechanism P1 adopts the main power supply +12V. The trip signal Trip output by the micro control unit 103 is given to the switching tube Q7, and the switching tube Q7 is used to control whether the release mechanism P1 acts.

[0082] Figure 8 is a schematic circuit diagram of a motor and its control circuit provided by an embodiment of the present invention. Combining Figure 5 and Figure 8, the operating voltage of the motor P2 is the third voltage source +24V output by the auxiliary power supply unit 104 (i.e., the auxiliary power supply connected to the input end of the auxiliary power supply unit 104). The control signal MOTOR of the motor P2 is output by the micro-control unit 103 to control the switching transistor Q6. The conduction of the switching transistor Q6 is used to energize the coil of the relay K1, so that the control switch of the relay K1 is closed, that is, the motor P2 operates. The coil of the relay K1 is powered by the main power supply +12V. When the motor P2 needs to stop, the micro-control unit 103 turns off the switching transistor Q6, the coil of the relay K1 loses power, and the potential in the coil is discharged through the diode D3; when the relay K1 disconnects the motor P2, part of the arc is shunted through the resistors R124, R125 and the capacitor C83, reducing the damage to the relay switch caused by the arc and improving the service life of the relay switch. When the TVS tube D2 is connected in parallel at the access end of the motor P2, the TVS tube D2 is used to release the back electromotive force of the motor P2 to prevent damage to the relay switch caused by excessive superimposed voltage.

[0083] In the intelligent reclosing circuit breaker provided in this embodiment, the circuit breaker body is provided with a motor, a relay, a position switch and a release. One end of the motor is connected to the third voltage source, and the other end is grounded through the relay. The control end of the relay is connected to the micro-control unit. The micro-control unit is further configured to adjust the operating state of the motor by controlling the on / off of the relay. The motor is used to drive the transmission device to make the circuit breaker complete opening and closing. The position switch is connected to the micro-control unit, and the position switch is used to feedback the switch position signal of the circuit breaker to the micro-control unit; the release is connected to the micro-control unit, and the release is used to release the holding mechanism according to the protection control signal of the micro-control unit to disconnect the main circuit where the circuit breaker is located; the position switch and the release are powered by the first voltage source, realizing automatic control of the state of the transmission device in the circuit breaker and position acquisition, as well as automatic control of the release, improving the automation degree of the circuit breaker.

[0084] Optionally, Figure 9 is a schematic diagram of the composition of another intelligent reclosing circuit breaker provided by the embodiment of the present invention. On the basis of the foregoing embodiment, refer to Figure 9 , the intelligent reclosing circuit breaker 100 further includes a protection current amplification unit 501. The protection current amplification unit 501 is connected to the protection current input unit 101, and the protection current amplification unit 501 is used to perform amplification processing on the protection current. The micro-control unit 103 is also connected to the protection current amplification unit 501, and the micro-control unit 103 is further used to control the operating state of the circuit breaker body 106 according to the amplified protection current.

[0085] Specifically, the protection current amplification unit 501 refers to a current processing component that performs amplification operations on the protection current accessed by the protection current input unit 101. Exemplarily, the protection current amplification unit 501 may include three operational amplifiers corresponding to the three-phase protection currents respectively. The protection current amplification unit 501 is also connected to the micro control unit 103, and the micro control unit 103 also determines whether the main circuit is in an over-current abnormal state based on the protection current after the amplification operation process, and controls the working state of the circuit breaker body 106 according to the judgment result, so as to realize the protection control of the main circuit.

[0086] Exemplarily, Figure 10 is a schematic circuit diagram of a protection current amplification unit provided by an embodiment of the present invention. In combination with Figure 9 and Figure 10 , the protection current amplification unit 501 may be provided with three amplifiers U14C, U14D, and U14A to perform operational amplification on the three-phase protection currents IN1, IN2, and IN3 respectively, and send the three groups of amplified signals IA, IB, and IC to the micro control unit 103 respectively. The micro control unit 103 performs analog-to-digital conversion on the protection current, as well as corresponding data processing and judgment.

[0087] The intelligent reclosing circuit breaker provided in this embodiment is provided with a protection current amplification unit. The protection current amplification unit is connected to the protection current input unit, and the protection current amplification unit is used to perform amplification processing on the protection current. The micro control unit is also connected to the protection current amplification unit, and the micro control unit is also used to control the working state of the circuit breaker body according to the protection current after the amplification processing, realizing the over-current protection of the main circuit and improving the reliability of the intelligent reclosing circuit breaker.

[0088] Optionally, Figure 11 is a schematic composition diagram of another intelligent reclosing circuit breaker provided by an embodiment of the present invention. On the basis of the foregoing embodiment, with reference to Figure 11 , the intelligent reclosing circuit breaker 100 further includes a metering unit 601. The metering unit 601 is connected to the main circuit, and the metering unit 601 is used to determine metering parameters according to the electrical parameters on the main circuit. The micro control unit 103 is connected to the metering unit 601, and the micro control unit 103 is also used to control the working state of the circuit breaker body 106 according to the metering parameters.

[0089] Specifically, the metering unit 601 refers to a component that collects metering parameters of the main circuit. Exemplarily, the metering parameters may include at least one of the voltage, current, frequency, power factor, power, and power consumption of the main circuit. The micro control unit 103 may control the operating state of the circuit breaker body 106 according to at least one metering parameter. Exemplarily, when the current power consumption reaches the purchased power of the user, the micro control unit 103 may control the motor P2 in the circuit breaker body 106 to actuate, drive the transmission device to move, so that the circuit breaker completes tripping and remains in the tripped state.

[0090] Exemplarily, Figure 12 is a schematic diagram of the composition of another intelligent reclosing circuit breaker provided by an embodiment of the present invention. On the basis of the foregoing embodiment, in combination with Figure 11 and Figure 12 , the metering unit 601 may include a line voltage input circuit 701, a metering current input circuit 702, and a metering electrical parameter acquisition circuit 703. The input end of the line voltage input circuit 701 is externally connected to the main circuit, and the line voltage input circuit 701 is used to access the line voltage on the main circuit. The input end of the metering current input circuit 702 is externally connected to a metering current acquisition device provided on the main circuit, and the metering current input circuit 702 is used to access the metering current acquired by the metering current acquisition device. The metering electrical parameter acquisition circuit 703 is respectively connected to the output end of the line voltage input circuit 701, the output end of the metering current input circuit 702, and the micro control unit 103. The metering electrical parameter acquisition circuit 703 is used to determine the metering parameters of the main circuit according to the line voltage and the metering current and feedback them to the micro control unit 103.

[0091] Figure 13 is a circuit schematic diagram of a line voltage input circuit and a metering current input circuit provided by an embodiment of the present invention. In combination with Figure 12 and Figure 13 , the interface P8 is the main circuit voltage interface for accessing the three-phase line voltage signals Ua, Ub, and Uc on the main circuit. The accessed line voltage signals are stepped down through step-down resistors R85, R86, R87, R88, R89, R90, R91, R92, R93, R94, R95, and R96. The parallel branch of resistor R21 and resistor R83 and the parallel branch of resistor R20 and resistor R84 are two voltage sampling resistors, both of which use three-phase three-wire voltage sampling and are transmitted to the metering electrical parameter acquisition circuit 703 through interfaces U1’, U2’, and UN’. Continuing to combine Figure 11 and Figure 13, the interface J1 is the input end of three current transformers, used to access the secondary current of the metering current transformer. Through resistors R76, R77, R78, R79, R80 and R81, the three groups of current signals are converted into corresponding three groups of voltage signals ICP - ICN, IBP - IBN and IAP - IAN, and transmitted to the metering electrical parameter acquisition circuit 703.

[0092] Figure 14 is a circuit schematic diagram of a metering electrical parameter acquisition circuit provided by this embodiment. There is a connection relationship between interfaces with the same label in the figure. Combining Figure 12 and Figure 14 , the metering electrical parameters are acquired by a dedicated metering chip U13. The output parameters include voltage, current, frequency, power factor, power, electricity quantity and other parameters. The parameter data is transmitted to the micro - control unit 103 using the SPI method.

[0093] The intelligent reclosing circuit breaker provided by this embodiment is provided with a metering unit. The metering unit is connected to the main circuit and is used to determine metering parameters according to the electrical parameters on the main circuit. The micro - control unit is connected to the metering unit and is also used to control the working state of the circuit breaker body according to the metering parameters, realizing the metering and feedback of the main circuit parameters. The control module controls the state of the circuit breaker body according to the metering parameters, expanding the control function of the reclosing circuit breaker.

[0094] Optionally, Figure 15 is a schematic diagram of the composition of another intelligent reclosing circuit breaker provided by an embodiment of the present invention. On the basis of the foregoing embodiment, referring to Figure 15 , the intelligent reclosing circuit breaker 100 further includes an interaction unit 1501. The interaction unit 1501 is connected to the micro - control unit 103, and the interaction unit 1501 is used to realize human - machine interaction.

[0095] Specifically, the interaction unit 1501 refers to a component that can realize human - machine interaction between the user and the micro - control unit 103. The interaction unit 1501 may include a display device, an indicator light and an input device. The display device, the indicator light and the input device are respectively connected to the micro - control unit 103. The display device is used to display metering parameters and / or the state of the circuit breaker body 106. The indicator light is used to indicate the working state of the intelligent reclosing circuit breaker 100. The input device is used to input control signals, where the control signals are used to set and view relevant parameters. The relevant parameters may include metering parameters and adjustable state parameters of any circuit or component in the intelligent reclosing circuit breaker. Exemplarily, the display device may include at least one of a liquid crystal display screen, an LED display screen and a digital tube display screen, and the input device may include a button assembly.

[0096] Exemplarily, Figure 16A circuit schematic diagram of a display device and an indicator light provided by an embodiment of the present invention. In combination with Figure 15 and Figure 16 , the display device uses a 4-digit digital tube display LED1. Each control pin of the digital tube display LED1 is connected to the micro control unit 103, and can dynamically display measurement parameters and the status of the circuit breaker body 106 according to the control signal of the micro control unit 103. The display method adopts a scanning display. Four indicator lights can be set, namely indicator light LED1, indicator light LED2, indicator light LED3, and indicator light LED4. According to the corresponding control signals sent by the micro control unit 103, the four indicator lights respectively indicate the operating state, fault state, communication state, and warning state. The input device can be a combination of multiple buttons. In combination with the display device, relevant parameters can be set and / or viewed. Exemplarily, the input device can include a closing button, an upward switching button, a tripping button, a returning to the upper layer button, a confirmation button, a setting menu button, and a downward switching button. The signal feedback terminals of the seven buttons are respectively connected to the micro control unit to feedback corresponding button signals to the micro control unit.

[0097] An embodiment of the present invention also provides a power distribution system. Figure 17 A composition schematic diagram of a power distribution system provided by an embodiment of the present invention. On the basis of the foregoing embodiment, referring to Figure 17 , the power distribution system 1700 includes the intelligent reclosing circuit breaker 100 described in any embodiment.

[0098] In the intelligent reclosing circuit breaker and the power distribution system provided by this embodiment, the protection current input unit is externally connected to a protection current sensing device arranged on the main circuit. The input end of the auxiliary power supply unit is externally connected to an auxiliary power supply, and the output end of the auxiliary power supply unit is connected to the main power supply line. The positive code communication unit is respectively connected to an external communication device and the micro control unit. The micro control unit is also connected to the circuit breaker body and controls the working state of the circuit breaker body according to remote communication signals. The main power supply line is respectively connected to the micro control unit and the circuit breaker body to provide a first voltage source for the micro control unit and the circuit breaker body. The auxiliary power supply unit is also connected to the positive code communication unit and the circuit breaker body to provide a second voltage source for the positive code communication unit and a third voltage source for the circuit breaker body, realizing dual power supply for the circuit breaker, solving the problem of remote control failure in the case of main circuit power failure, and reducing the dependence of the intelligent reclosing circuit breaker on manual operation.

[0099] The above specific implementation manners do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An intelligent reclosing circuit breaker, characterized in that: include: Protection current input unit, protection isolation power supply unit, micro control unit, auxiliary power supply unit, positive code communication unit and circuit breaker body; The protection current input unit is externally connected to a protection current sensor device provided on the main circuit, and the protection current input unit is used to access the protection current acquired by the protection current sensor device; The input end of the protection isolation power supply unit is connected to the protection current input unit, the output end of the protection isolation power supply unit is connected to the main power supply line, and the protection isolation power supply unit is used to provide main power for the main power supply line; The input end of the auxiliary power supply unit is externally connected to an auxiliary power supply, the output end of the auxiliary power supply unit is connected to the main power supply line, and the auxiliary power supply unit provides a secondary power supply for the main power supply line; The positive code communication unit is connected to the external communication device and the micro control unit respectively, and the positive code communication unit is used to perform remote communication signal transmission between the external communication device and the micro control unit; The micro control unit is also connected to the circuit breaker body, and the micro control unit is used to control the working state of the circuit breaker body according to the remote communication signal; The main power supply circuit is connected to the micro control unit and the circuit breaker body respectively to provide a first voltage source for the micro control unit and the circuit breaker body; The auxiliary power supply unit is also connected to the positive code communication unit and the circuit breaker body, and the auxiliary power supply unit is also used to provide a second voltage source for the positive code communication unit and a third voltage source for the circuit breaker body.

2. The intelligent reclosing circuit breaker according to claim 1, characterized in that: The circuit breaker body includes a motor and a relay; One end of the motor is connected to the third voltage source, and the other end is grounded via the relay, and the control end of the relay is connected to the micro control unit; The micro control unit is also used to adjust the working state of the motor by controlling the on and off of the relay. The motor is used to drive the transmission device to complete the opening and closing of the circuit breaker.

3. The intelligent reclosing circuit breaker according to claim 1, characterized in that: The circuit breaker body also includes a position switch and a release; The position switch is connected to the micro control unit, and the position switch is used to feed back a switch position signal of the circuit breaker to the micro control unit; The release is connected to the micro control unit, and the release is used to release the holding mechanism according to the protection control signal of the micro control unit to disconnect the main circuit where the circuit breaker is located; The position switch and the release are powered by the first voltage source and the third voltage source.

4. The intelligent reclosing circuit breaker according to claim 1, characterized in that: The positive code communication unit includes a first optical coupler isolator, a second optical coupler isolator, a third optical coupler isolator, a common mode inductor and an RS485 transceiver chip; The input end of the first optical coupler isolator is connected to the receiver output end RO of the RS485 transceiver chip, and the output end thereof is connected to the micro control unit; The input end of the second optical coupler isolator is connected to the micro control unit, and the output end thereof is respectively connected to the receiving enable end REB and the transmitting enable end DE of the RS485 transceiver chip; The input end of the third optical coupler isolator is connected to the micro control unit, and the output end thereof is connected to the driver input end DI of the RS485 transceiver chip; One end of the first side of the common mode inductor is connected to the differential signal transmission end of the RS485 transceiver chip, and the other end of the first side of the common mode inductor is connected to the corresponding external communication port; One end of the second side of the common mode inductor is connected to the receiving differential signal end of the RS485 transceiver chip, and the other end of the second side of the common mode inductor is connected to the corresponding external communication port.

5. The intelligent reclosing circuit breaker according to claim 1, characterized in that: Also includes: Protect the current amplification unit; The protection current amplification unit is connected to the protection current input unit, and the protection current amplification unit is used to amplify the protection current; The micro control unit is also connected to the protection current amplification unit, and the micro control unit is also used to control the working state of the circuit breaker body according to the protection current after the amplification process.

6. The intelligent reclosing circuit breaker according to claim 1, characterized in that: Also includes: Unit of measurement; The metering unit is connected to the main circuit, and is used to determine the metering parameters according to the electrical parameters on the main circuit; The micro control unit is connected to the metering unit, and the micro control unit is also used to control the working state of the circuit breaker body according to the metering parameters.

7. The intelligent reclosing circuit breaker according to claim 6, characterized in that: The metering unit comprises: a line voltage input circuit, a metering current input circuit and a metering electrical parameter acquisition circuit; The input end of the line voltage input circuit is externally connected to the main circuit, and the line voltage input circuit is used to access the line voltage on the main circuit; The input end of the metering current input circuit is externally connected to the metering current acquisition device provided on the main circuit, and the metering current input circuit is used to access the metering current acquired by the metering current acquisition device; The metering electrical parameter acquisition circuit is respectively connected to the output end of the line voltage input circuit, the output end of the metering current input circuit and the micro control unit. The metering electrical parameter acquisition circuit is used to determine the metering parameters of the main circuit according to the line voltage and the metering current and feed them back to the micro control unit.

8. The intelligent reclosing circuit breaker according to claim 6 or 7, characterized in that: Also includes: An interaction unit is connected to the micro control unit, and is used to realize human-computer interaction.

9. The intelligent reclosing circuit breaker according to claim 8, characterized in that: The interaction unit includes a display device, an indicator light and an input device; The display device, the indicator light and the input device are respectively connected to the micro control unit, and the display device is used to display the metering parameters and / or the state of the circuit breaker body; The indicator light is used to indicate the working status of the intelligent reclosing circuit breaker; The input device is used to input control signals, wherein the control signals are used to set and view relevant parameters.

10. A power distribution system, characterized in that: It comprises the intelligent reclosing circuit breaker as described in any one of claims 1-9.

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