Modularized circuit breaker

Abstract

The utility model relates to the technical field of circuit breakers for low-voltage power systems, and particularly discloses a modularized circuit breaker, which comprises a circuit breaker body and a selective on-off load module arranged on one side of the circuit breaker body. The selective on-off load module comprises a module shell, and a current transformer, a relay, a conversion terminal and a module electronic controller which are electrically connected are mounted in the module shell; the module electronic controller comprises a signal acquisition unit, a self-powered unit, a current setting unit, an information processing unit and an output unit which are electrically connected. According to the modularized circuit breaker adopting the structure, the overall size of the box body is reduced, the cost is saved, the power failure range is reduced, unnecessary loss caused by power failure is reduced, and convenience can be provided for users.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers for low-voltage power systems, and in particular relates to a modular circuit breaker. Background Art

[0002] The selective protection of circuit breakers currently on the market refers to the mutual coordination of the action characteristics of two or more protection devices. When an overcurrent fault occurs at a certain point in the low-voltage power distribution system, the electrical equipment of the power distribution system performs selective breaking actions according to a predetermined action sequence to prevent over-tripping, thereby narrowing the scope of the power outage, minimizing the scope of the power outage, and reducing unnecessary losses, but the cost is high.

[0003] In the daily power distribution system, the load side of the main circuit breaker is divided into many branches, and the sum of the rated currents of the branches is much higher than the rated current of the main circuit breaker. If the loads of all branches are running and do not exceed their respective rated currents, the current on the load side of the main circuit breaker will be very large, causing the main circuit breaker to trip, resulting in a large-scale power outage. To solve this problem, a method is needed to disconnect one of the branches of the load when the load of the main circuit breaker reaches or exceeds the rated current. If the requirement is still not met, disconnect another branch, and so on, until the requirements of the main circuit breaker are met to ensure that the main circuit breaker does not trip; when the total current is lower than the set value, restore the power supply of each branch in turn; the order of disconnecting the branch loads is arranged according to the importance of the power outage, disconnecting unimportant loads first; when the power supply is restored, connect the loads with high importance first. Using existing technology to solve this problem requires adding unnecessary branch circuits, which increases costs.

[0004] In view of this, how to provide a circuit breaker with its own modularity has become a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0005] The utility model aims to solve the above technical problems to a certain extent by providing a modular circuit breaker which is inexpensive and has the functions of self-selective disconnection and load connection in order to solve the above technical problems in a multi-branch power distribution system in the prior art, such as difficulty in realizing selective protection and high cost.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A modular circuit breaker comprises a circuit breaker body and a selective load disconnection and connection module arranged on one side of the circuit breaker body;

[0008] The selective load disconnecting module comprises a module housing, and the module housing is assembled and connected with the circuit breaker body;

[0009] The module housing is provided with electrically connected current transformers, relays, transfer terminals and module electronic controllers;

[0010] The module electronic controller includes a signal acquisition unit, a self-power supply unit, a current setting unit, an information processing unit and an output unit which are electrically connected.

[0011] Preferably, the signal acquisition unit includes load resistors R2, R3 and R4 on the secondary coil side of the current transformer. The current transformer is connected to the N1 operational amplifier after the output voltage is limited by the load resistors R2 and R3, for transmission of the current signal; the load resistor R4 is used for voltage division of the N1 operational amplifier;

[0012] The self-power supply unit includes a voltage stabilizing circuit and a filtering circuit. The voltage stabilizing circuit includes: diodes D1, D2, D3, and D4 are connected to form a bridge rectifier, and then pass through a diode D5, resistors R5-R10, N2 voltage comparator, C3 filter capacitor and D6 voltage stabilizing diode; the filtering circuit includes: diode D7, resistor R11, integrated voltage stabilizer 78L05, filter capacitors C4-C9;

[0013] The current setting unit includes resistors R12, R13, R14 and an automatic transfer switch SW1. The automatic transfer switch SW1 delays 1s after the resistor R12 is turned on and switches to the resistor R13 circuit, and delays 1s after the resistor R13 is turned on and switches to the resistor R14 circuit;

[0014] The information processing unit includes an MCU integrated chip, which is used to receive signals from resistors R12, R13, and R14, and selectively close or disconnect relays KT1, KT2, and KT3 after calculation;

[0015] The output unit includes resistors R15, R16, R17, transistors Q1, Q2, Q3, diodes D8, D9, D10, and relays KT1, KT2, KT3.

[0016] Preferably, the signal acquisition unit further comprises capacitors C1 and C2 for filtering the ground.

[0017] Preferably, the final output voltage of the self-power supply unit is 5V.

[0018] Preferably, after receiving the signal from the resistor R12, the MCU integrated chip calculates:

[0019] When the current is greater than the set current, OUT0 at angle M9 outputs the first trigger signal circuit to disconnect relay KT1;

[0020] When the current is greater than the set current, OUT1 outputs the second trigger signal circuit at corner M8 to disconnect relay KT2;

[0021] When the current is greater than the set current, OUT2 outputs the third trigger signal circuit at corner M6 to disconnect relay KT3;

[0022] When the current is less than the set current, KT3, KT2 and KT1 will be attracted in sequence.

[0023] Preferably, the current transformer is a current transformer with an iron core, which is used to collect current signals in the circuit and provide power for the module electronic controller.

[0024] Preferably, the module housing is provided with a groove for fixing the current transformer, a boss guide column for fixing the module electronic controller, a position fixing groove for fixing the relay, and a groove for installing the adapter terminal.

[0025] The utility model discloses the following technical effects:

[0026] The modular circuit breaker using the above structure not only reduces the overall volume of the box and saves costs, but also narrows the scope of power outages, reduces unnecessary losses caused by power outages, and provides convenience for users. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 This is a schematic structural diagram of a modular circuit breaker according to an embodiment of the utility model;

[0029] Figure 2 This is a schematic diagram of the structure of the selective disconnection and connection load module in the embodiment of the utility model;

[0030] Figure 3 It is a circuit module diagram of a module electronic controller in an embodiment of the utility model.

[0031] Among them, 1. Circuit breaker body; 2. Selective disconnection and connection load module; 3. Current transformer; 4. Relay; 5. Transfer terminal; 6. Module electronic controller; 61. Signal acquisition unit; 62. Self-power supply unit; 63. Current setting unit; 64. Information processing unit; 65. Output unit. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] Reference Figures 1 to 3 As shown, an embodiment of the utility model provides a modular circuit breaker, the circuit breaker includes a circuit breaker body 1 and a selective disconnection and connection load module 2 arranged on one side of the circuit breaker body 1, the selective disconnection and connection load module 2 is a functional module for selectively disconnecting and closing the load; the selective disconnection and connection load module 2 includes a module housing, a current transformer 3, a relay 4, a transfer terminal 5 and a module electronic controller 6; the module housing is placed on the right side of the circuit breaker and assembled with the circuit breaker body 1, and is provided with a groove for fixing the current transformer 3 and a boss guide column for fixing the module electronic controller 6, a position fixing groove for fixing the relay 4, and a groove for installing the transfer terminal 5, the current transformer 3, the relay 4, the transfer terminal 5 and the module electronic controller 6 are connected in the module housing; the transfer terminal 5 is used for the main incoming line to divide each relay 4 and the N line.

[0035] Specifically, Figure 3 As shown, the module electronic controller 6 includes: a signal acquisition unit 61 , a self-power supply unit 62 , a current setting unit 63 , an information processing unit 64 and an output unit 65 .

[0036] Specifically, in the signal acquisition unit 61, the current transformer 3 is connected to the N1 operational amplifier after the output voltage is limited by the R2 and R3 load resistors for current signal transmission. R4 is used for the voltage division of the N1 operational amplifier, and the capacitors C1 and C2 form a filtering effect on the ground.

[0037] Specifically, the self-power supply unit 62 is composed of two parts: voltage stabilization and filtering circuits. The voltage stabilization circuit is composed of diodes D1, D2, D3, and D4 connected to form a bridge rectifier, which then passes through a diode D5; resistors R5, R6, R7, R8, R9, and R10; N2 voltage comparator; C3 filter capacitor, and D6 voltage stabilization diode. The filtering circuit is composed of a diode D7, a resistor R11, an integrated voltage stabilizer 78L05, and filter capacitors C4, C5, C6, C7, C8, and C9; and the final output is a voltage of 5V.

[0038] Specifically, the circuit of the current setting unit 63 is composed of resistors R12, R13, R14 and an automatic transfer switch SW1; the automatic transfer switch SW1 delays 1s to switch to the resistor R13 circuit after the resistor R12 is turned on, and delays 1s to switch to the resistor R14 circuit after the resistor R13 is turned on, wherein the function of R12, R13, R14 is to sample the rated current value.

[0039] Specifically, the information processing unit 64 is composed of an MCU integrated chip; after receiving the signal of the resistor R12, after calculation, when it is greater than the set current, the first trigger signal circuit is output at OUT0 at angle M9 to disconnect the relay KT1. After receiving the signal of the resistor R13, after calculation, when it is greater than the set current, the second trigger signal circuit is output at OUT1 at angle M8 to disconnect the relay KT2. After receiving the signal of the resistor R14, after calculation, when it is greater than the set current, the third trigger signal circuit is output at OUT2 at angle M6 to disconnect the relay KT3. Similarly, after the MCU integrated chip receives the signal, when it is less than the set current after calculation, KT3, KT2, and KT1 will be attracted in sequence. Among them, angles M6, M8, and M9 refer to the output angles of the MCU integrated chip.

[0040] Specifically, the output unit 65 can automatically disconnect and close, and includes resistors R15, R16, R17, transistors Q1, Q2, Q3, diodes D8, D9, D10, and relays KT1, KT2, KT3.

[0041] According to a further optimization scheme, the current transformer 3 is a current transformer 3 with an iron core, which is used to collect current signals in the circuit and provide power to the module electronic controller 6, so that the entire module does not need to be equipped with a separate power supply.

[0042] The specific working process of the embodiment of the utility model is as follows:

[0043] The L-pole conductor of the circuit breaker is connected to the current transformer 3 through the core; the secondary side S1 and S2 of the current transformer 3 are connected to the signal amplifier after the output voltage is limited by the load resistors R2 and R3, which are used for the transmission of the current signal and provide power for the electronic controller. The voltage stabilizing module in the self-power supply unit 62 processes the AC current induced by the current transformer 3 into DC, which is used as the power supply of the electronic controller; the setting unit samples the current signal through R12 and R13 or R14 to realize the selection of multiple output units 65. The processed current signal is analyzed and compared with the setting value of the setting unit parameter. If the comparison value is less than the setting value, the information processing unit 64 is triggered to trigger the transistors Q1, Q2, and Q3 in the output unit 65 to turn on, so that the relays KT1, KT2, and KT3 are energized and connected to the load; when the comparison value is greater than the setting value, the information processing unit 64 is triggered to turn off the transistors Q1, Q2, and Q3 in the output unit 65, so that the relays KT1, KT2, and KT3 lose power and disconnect, and the load is disconnected.

[0044] The utility model embodiment discloses the following beneficial effects:

[0045] The utility model adds a module for automatically selectively disconnecting and attracting loads on the right side of the small circuit breaker, which is assembled with the circuit breaker to form a circuit breaker with automatic selective disconnection and attraction protection functions; when the load of the main circuit breaker reaches or exceeds the rated current, one of the branches of the load is disconnected, if the requirement is still not met, another branch is disconnected, and so on, until the requirement of the main circuit breaker is met to ensure that the main circuit breaker is not tripped; when the total current is lower than the set value, the power supply of each branch is restored in turn; the branch load disconnection sequence is arranged according to the importance of the power outage, and unimportant loads are disconnected first; when the power supply is restored, the loads with high importance are connected first to meet the power supply needs of special places. The device has a simple structure, low cost, easy installation, low power consumption, is suitable for a variety of circuit breakers, and has broad application prospects.

[0046] The parts not described in detail in the present invention are all conventional technical means known to those skilled in the art.

[0047] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0048] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A modular circuit breaker, characterized in that: It comprises a circuit breaker (1) body and a selective load disconnection module (2) arranged on one side of the circuit breaker (1) body; The selective load disconnecting module (2) comprises a module housing, and the module housing is assembled and connected to the circuit breaker (1) body; An electrically connected current transformer (3), a relay (4), a transfer terminal (5) and a module electronic controller (6) are installed in the module housing; The module electronic controller (6) comprises an electrically connected signal acquisition unit (61), a self-power supply unit (62), a current setting unit (63), an information processing unit (64), and an output unit (65); The signal acquisition unit (61) comprises load resistors R2, R3 and R4, and capacitors C1 and C2 on the secondary coil side of the current transformer (3); the current transformer (3) is connected to the N1 operational amplifier after the output voltage is limited by the load resistors R2 and R3, for transmission of current signals; the load resistor R4 is used for voltage division of the N1 operational amplifier; the capacitors C1 and C2 form a filtering effect on the ground; The self-power supply unit (62) comprises a voltage stabilizing circuit and a filtering circuit, wherein the voltage stabilizing circuit comprises: diodes D1, D2, D3, and D4 connected to form a bridge rectifier, which passes through a diode D5, resistors R5-R10, a voltage comparator N2, a filtering capacitor C3, and a voltage stabilizing diode D6; the filtering circuit comprises: a diode D7, a resistor R11, an integrated voltage stabilizer 78L05, and filtering capacitors C4-C9; The current setting unit (63) comprises resistors R12, R13, R14 and an automatic transfer switch SW1, wherein the automatic transfer switch SW1 switches to the resistor R13 circuit after a delay of 1 second after the resistor R12 is turned on, and switches to the resistor R14 circuit after a delay of 1 second after the resistor R13 is turned on; The information processing unit (64) comprises an MCU integrated chip, the MCU integrated chip is used to receive signals from resistors R12, R13, and R14, and selectively close or open relays KT1, KT2, and KT3 after calculation; The output unit (65) comprises resistors R15, R16, R17, transistors Q1, Q2, Q3, diodes D8, D9, D10, and relays KT1, KT2, KT3.

2. The modular circuit breaker according to claim 1, characterized in that: The final output voltage of the self-power supply unit (62) is 5V.

3. The modular circuit breaker according to claim 1, characterized in that: After the MCU integrated chip receives the signal from the resistor R12, it calculates: When the current is greater than the set current, OUT0 at angle M9 outputs the first trigger signal circuit to disconnect relay KT1; When the current is greater than the set current, OUT1 outputs the second trigger signal circuit at corner M8 to disconnect relay KT2; When the current is greater than the set current, OUT2 outputs the third trigger signal circuit at corner M6 to disconnect relay KT3; When the current is less than the set current, KT3, KT2 and KT1 will be attracted in sequence.

4. The modular circuit breaker according to claim 1, characterized in that: The current transformer (3) is a current transformer (3) with an iron core, which is used to collect current signals in the circuit and provide power for the module electronic controller (6).

5. The modular circuit breaker according to claim 1, characterized in that: The module housing is provided with a groove for fixing the current transformer (3), a boss guide column for fixing the module electronic controller (6), a position fixing groove for fixing the relay (4), and a groove for installing the adapter terminal (5).

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