CN214100834U - Residual current operated circuit breaker - Google Patents
Residual current operated circuit breaker Download PDFInfo
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- CN214100834U CN214100834U CN202022228751.2U CN202022228751U CN214100834U CN 214100834 U CN214100834 U CN 214100834U CN 202022228751 U CN202022228751 U CN 202022228751U CN 214100834 U CN214100834 U CN 214100834U
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- acquisition processing
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Abstract
The utility model provides a residual current operated circuit breaker, includes residual current transformer, signal acquisition processing circuit and trip circuit, residual current transformer accepts residual current signal transmission to signal acquisition processing circuit with gathering on the main loop, and when the residual current value exceeded the rated residual current that signal acquisition processing circuit set for, signal acquisition processing circuit drive trip circuit switched on and is used for cutting off the main loop still be connected with the indicating circuit who has multiple instruction state on the signal acquisition processing circuit, when the residual current value is less than the rated residual current that signal acquisition processing circuit set for, signal acquisition processing circuit triggered the indicating circuit action to can judge the size of residual current according to the instruction state of difference. The utility model discloses be equipped with and be used for instructing the residual current that is less than rated residual current and can reflect the indicating circuit of residual current size, make the user can have the leakage current before the circuit breaker dropout outage in the discovery main loop, can in time take measures.
Description
Technical Field
The utility model relates to a low voltage apparatus field, concretely relates to residual current operated circuit breaker.
Background
A circuit breaker is an important switching device of an electric power system, and the circuit breaker can turn on and off load power of an electric device in a normal operation and can reliably cut off a fault current when a system has a fault. The residual current operated circuit breaker is a circuit breaker capable of rapidly cutting off the safety of a fault power supply protection person and electric equipment in a very short time, and only when residual current in a protected loop reaches a set protection threshold value, the tripping function of the residual current operated circuit breaker can be triggered, and the residual current operated circuit breaker does not have the function of warning in advance before tripping and power-off, so that data loss and equipment damage are easily caused by sudden power-off.
Disclosure of Invention
An object of the utility model is to overcome prior art's defect, provide a simple structure, have residual current operated circuit breaker that can leak electricity in advance and thread off early warning function.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a residual current operated circuit breaker, includes residual current transformer, signal acquisition processing circuit and trip circuit, residual current transformer accepts and is used for gathering residual current signal and transmits the residual current signal who gathers to signal acquisition processing circuit on the major loop, and when residual current value exceeded the rated residual current that signal acquisition processing circuit set for, signal acquisition processing circuit drive trip circuit switched on and is used for cutting off the major loop still be connected with the indicating circuit who has multiple instruction state on the signal acquisition processing circuit, when residual current value is less than the rated residual current that signal acquisition processing circuit set for, signal acquisition processing circuit triggered the indicating circuit action to can judge the size of residual current according to the instruction state of difference.
Further, the indicating circuit includes an indicator light controlled by the indicating circuit, the indicator light having a plurality of indicating states and each indicating state corresponds to a different range of remaining current values.
Further, the indicating lamp comprises a first indicating state, a second indicating state and a third indicating state, when the residual current value is smaller than 30% of the rated residual current, the indicating lamp is in the first indicating state, when the residual current value is 30-50% of the rated residual current, the indicating lamp is in the second indicating state, and when the residual current value is larger than or equal to 50% of the rated residual current, the indicating lamp is in the third indicating state.
Furthermore, still be connected with test circuit on the major loop, test circuit is connected with residual current transformer, and test circuit produces simulation residual current signal, and residual current transformer transmits the simulation residual current signal who detects to signal acquisition processing circuit, and signal acquisition processing circuit drive trip circuit switches on and cuts off the major loop.
Further, the signal acquisition processing circuit and the trip circuit are powered by a power circuit, the power circuit is connected to the main loop, and the power circuit performs voltage reduction processing on the voltage of the main loop and then supplies power to the signal acquisition processing circuit 105 and the trip circuit.
Further, the indicating circuit comprises a resistor R1, a resistor R2, a resistor R3 and a tristimulus indicator LED1, one ends of the resistor R1, the resistor R2 and the resistor R3 are connected to the signal acquisition processing circuit, the other ends of the resistor R1, the resistor R2 and the resistor R3 are connected with one end of the tristimulus indicator LED1, and the other end of the tristimulus indicator LED1 is connected with GND.
Further, the signal acquisition processing circuit comprises a chip U1, and the chip U1 is a special residual current acquisition processing chip integrated with an operational amplifier.
Further, the signal acquisition processing circuit comprises a chip U1, a resistor R1, a capacitor C1 and a capacitor C1, the chip U1 is connected with the indicating circuit and the tripping circuit respectively, the resistor R1 and the resistor R1 are connected in parallel to two ends of a secondary winding of the residual current transformer, one end of the resistor R1 is connected with one end of the resistor R1, the other end of the resistor R1 is connected with one end of the capacitor C1, one end of the capacitor C1 and a DN1 pin of the chip U1, the other end of the resistor R1 is connected with one end of the capacitor C1, the other end of the capacitor C1, one end of the capacitor C1 and one end of the capacitor C1 are connected to a TRC 36oa pin and a capacitor C1, and a capacitor C1 are connected to a capacitor C1 pin of the chip 1, respectively, The other end of the capacitor C10 and the GND pin of the chip U1 are connected to GND.
Further, the trip circuit includes resistance R10, resistance R11, condenser C11, diode VD1, silicon controlled rectifier Q1 and is used for the trip coil KA of the control main loop break-make, the one end and the signal acquisition processing circuit of resistance R10 are connected, the other end and the gate pole of resistance R11, capacitor C11 of resistance R10 and silicon controlled rectifier Q1 are connected, the positive pole and the negative pole of diode VD1 of silicon controlled rectifier Q1 are connected, the positive pole and the one end of trip coil KA of diode VD1 are connected, the other end of trip coil KA is connected on the main loop, the other end and the negative pole of silicon controlled rectifier Q1 of resistance R11, capacitor C11 are connected with GND.
Further, the test circuit comprises a test button T, a test winding and a resistor R12, the test button T, the test winding and a capacitor R12 are sequentially connected in series to form a test circuit connected into the main loop, and the test winding is connected to the residual current transformer.
Further, the power supply circuit comprises a capacitor C4, a capacitor C5, a resistor R4, a resistor R6, a rectifier bridge B1, a voltage regulator tube VZ1 and a voltage dependent resistor RV1, one input end of the rectifier bridge B1 and one end of the voltage dependent resistor RV1 are connected to the main loop, the other end of the voltage dependent resistor RV1 is connected to one end of a trip coil KA in the trip circuit, the other input end of the rectifier bridge B1 is connected to one end of a resistor R6, the other end of the resistor R6 is connected to the other end of the trip coil KA through a capacitor C5, the positive output end of the rectifier bridge B1 is connected to one end of a resistor R4, the other end of the resistor R4 is connected to the positive electrode of the capacitor C4 and the cathode of the voltage regulator tube VZ1, the other end of the resistor R4 is used as a power supply end and connected to the signal acquisition and processing circuit, and the negative electrode of the capacitor C4, the anode of the voltage regulator tube VZ1 and the negative output end of the rectifier bridge B1 are connected to GND.
The utility model discloses a residual current operated circuit breaker connects indicating circuit on signal acquisition processing circuit and is used for instructing the residual current that is less than rated residual current to indicating circuit can reflect the size of residual current, provides the early warning effect before tripping operation is carried out to the trip circuit, makes the user have the leakage current in discovering the major loop before the circuit breaker tripping operation, can in time take measures, avoids bringing the loss because of the outage suddenly.
In addition, the indicating circuit is provided with indicating lamps in three indicating states, when the residual current is less than 30% of the rated residual current, 30% -50% of the rated residual current and more than or equal to 50% of the rated residual current, the indicating lamps respectively correspond to the three different indicating states, the residual current can be found in time, remedial measures can be taken in time, and loss is avoided.
In addition, the signal acquisition processing circuit adopts a special residual current acquisition processing chip integrated with an operational amplifier, the cost is lower than that of a mode that a single chip microcomputer is matched with the operational amplifier, and an indicator lamp of the indicating circuit is directly connected with the chip.
In addition, the testing circuit is connected to the main loop and generates simulated residual current to detect the operating characteristics of the circuit breaker.
Drawings
Fig. 1 is a schematic connection diagram of a residual current operated circuit breaker according to the present invention;
fig. 2 is a circuit diagram of a residual current operated circuit breaker according to the present invention.
Detailed Description
The following description will further describe a specific embodiment of the residual current operated circuit breaker according to the present invention with reference to the embodiments shown in fig. 1 to 2. The utility model discloses a residual current operated circuit breaker is not limited to the description of following embodiment.
The utility model provides a residual current operated circuit breaker, includes residual current transformer 101, signal acquisition processing circuit 105 and trip circuit 104, residual current transformer 101 accepts and is used for gathering residual current signal and transmitting the residual current signal who gathers to signal acquisition processing circuit 105 on the main circuit, and when residual current value exceeded the rated residual current that signal acquisition processing circuit 105 set for, signal acquisition processing circuit 105 drive trip circuit 104 switches on and is used for cutting off the main circuit still be connected with indicating circuit 106 that has multiple instruction state on signal acquisition processing circuit 105, when residual current value is less than the rated residual current that signal acquisition processing circuit 105 set for, signal acquisition processing circuit 105 triggers indicating circuit 106 action to can judge the size of residual current according to the instruction state of difference.
The utility model discloses a residual current operated circuit breaker connects indicating circuit 106 and is used for instructing the residual current that is less than rated residual current on signal acquisition processing circuit 105 to indicating circuit 106 can reflect the size of residual current, provides the early warning effect before tripping operation is carried out to trip circuit 104, makes the user have the leakage current before the circuit breaker is tripped and is cut off the power supply in the discovery main loop, can in time take measures, avoids bringing the loss because of the outage suddenly.
An embodiment is provided with reference to fig. 1 and fig. 2, the residual current operated circuit breaker includes a residual current transformer 101, a signal collecting and processing circuit 105, and a trip circuit 104, where the residual current transformer 101 is connected to a main circuit for collecting residual current signals and transmitting the collected residual current signals to the signal collecting and processing circuit 105, when a residual current value exceeds a rated residual current set by the signal collecting and processing circuit 105, the signal collecting and processing circuit 105 drives the trip circuit 104 to be conducted for cutting off the main circuit, preferably, the signal collecting and processing circuit 105 and the trip circuit 104 are powered by a power circuit 102, the power circuit 102 is connected to the main circuit, the power circuit 102 performs voltage reduction processing on a voltage of the main circuit and then powers the signal collecting and processing circuit 105 and the trip circuit 104, and the power circuit 102 may adopt a linear voltage reduction mode to the main circuit, The switch power supply reduces the voltage in a voltage reduction mode or other voltage reduction modes.
The signal acquisition processing circuit 105 is also connected with an indicating circuit 106 with various indicating states, when the residual current value is smaller than the rated residual current set by the signal acquisition processing circuit 105, the signal acquisition processing circuit 105 triggers the indicating circuit 106 to operate, and the magnitude of the residual current can be judged according to different indicating states. The various indication states may be one or more of vibration, sound, brightness, etc., in this embodiment, by way of brightness indication, an indicator light controlled by the indicator circuit 106 is provided in the indicator circuit 106, the indicator light having a plurality of indicator states and each indicator state corresponding to a different range of the remaining current value, preferably the indicator light includes a first indicator state, a second indicator state and a third indicator state, when the residual current value is less than 30% of the rated residual current, the indicator lamp is in a first indicating state (for example, the indicator lamp displays green), when the residual current value is 30-50% of the rated residual current, the indicator lamp is in a second indicating state (for example, the indicator lamp displays yellow), when the residual current value is greater than or equal to 50% of the rated residual current, the indicator lamp is in a third indicating state (for example, the indicator lamp displays red). Of course, the range of the remaining current value indicated by the indicator lamp can be adjusted according to actual needs, and is not limited to three ranges of the embodiment, and there may be more or less ranges, and the corresponding indicator lamps also have the same number of indication states, and different indication states may be distinguished by the brightness, color, and flicker degree of the indicator lamps. In this embodiment, the rated residual current I Δ n is one of 30mA, 100mA and 300mA or any residual current specification meeting the standard requirement.
The main circuit is also connected with a motion characteristic test circuit 103 for detecting the circuit breaker, the test circuit 103 is connected with the residual current transformer 101, the test circuit 103 generates a simulated residual current signal, the residual current transformer 101 transmits the detected simulated residual current signal to the signal acquisition processing circuit 105, and the signal acquisition processing circuit 105 drives the tripping circuit 104 to be switched on and switched off the main circuit.
A detailed circuit connection mode is provided in conjunction with fig. 2, the residual current transformer 101 is arranged on the main loop, the power supply circuit 102 is connected on the main loop and supplies power to the signal acquisition processing circuit 105 and the trip circuit 104 after reducing the voltage of the main loop, the signal acquisition processing circuit 105 is connected on the secondary winding 107 of the residual current transformer 101, one end of the trip circuit 104 is connected on the main loop, the other end of the trip circuit is connected with the signal acquisition processing circuit 105, the test circuit 103 is connected on the main loop and used for generating analog residual current, and the test circuit 103 is connected with the residual current transformer 101 through the test winding 108.
The signal acquisition processing circuit 105 of the embodiment comprises a chip U1, the chip U1 is a special residual current acquisition processing chip, an internal integrated operational amplifier is realized, the cost is lower than that of a mode that a single chip microcomputer is matched with the operational amplifier, an indicator lamp of the indicator circuit 106 is directly connected with the chip U1, and the chip U1 of the embodiment is LW 601. Of course, the operation amplifier can be realized by matching with components such as a singlechip and the like.
Specifically, the signal acquisition and processing circuit 105 includes a chip U1, a resistor R5, a resistor R7, a resistor R8, a resistor R9, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9 and a capacitor C10, the chip U10 is connected to the indicating circuit 106 and the trip circuit 104, the resistor R10 and the resistor R10 are connected in parallel to both ends of the secondary winding 107 of the residual current transformer 101, preferably, the parallel structure formed by the resistor R10 and the resistor R10 is further connected in parallel to two diodes for surge protection, one end of the resistor R10 is connected to one end of the resistor R10, the other end of the resistor R10 is connected to one end of the capacitor C10, one end of the capacitor C10 and a DN 10 pin of the chip U10, and the other end of the resistor R10 is connected to the other end of the capacitor C10, the DN 10 and the DN 10 of the capacitor C10 and the DN 10 One end of the capacitor C10 is connected to the OA pin and the TRC pin of the chip U1, and the other ends of the capacitor C7, the capacitor C8, the capacitor C9, the capacitor C10, and the GND pin of the chip U1 are connected to GND. The chip U1, the resistor R7 and the resistor R8 are combined to determine the ratio of the residual current to the rated residual current, for example, the residual current is 30% of the rated residual current.
The tripping circuit 104 comprises a resistor R10, a resistor R11, a capacitor C11, a diode VD1, a thyristor Q1 and a tripping coil KA for controlling the on-off of a main loop, one end of the resistor R10 is connected with the signal acquisition processing circuit 105, the resistor R10 is particularly connected to a QS pin of a chip U1, the other end of the resistor R10 is connected with one end of a resistor R11, one end of a capacitor C11 and a gate of the thyristor Q1, an anode of the thyristor Q1 is connected with a cathode of the diode VD1, an anode of a diode VD1 is connected with one end of the tripping coil KA, the other end of the tripping coil KA is connected to the main loop, the other ends of the resistor R11, the capacitor C11 and a cathode of the thyristor Q1 are connected with GND, after the chip U1 acquires a residual current signal, when the KA current reaches a set rated residual current, the QS pin of the chip U1 outputs a trigger pulse signal, the thyristor Q1 is conducted to conduct the tripping coil, and an iron core inside the tripping coil KA is sucked to trigger the circuit breaker to trip.
The indicating circuit 106 includes a resistor R1, a resistor R2, a resistor R3 and a three-color indicator LED1, one end of the resistor R1, one end of the resistor R2 and one end of the resistor R3 are connected to the signal acquisition processing circuit 105, specifically, one end of the resistor R1, one end of the resistor R2 and one end of the resistor R3 are connected to the DE pin, the WE pin and the SE pin of the chip U1, the other end of the resistor R1, the other end of the resistor R2 and the other end of the resistor R3 are connected to one end of the three-color indicator LED1, the other end of the three-color indicator LED1 is connected to GND, when the residual current does not reach the set rated residual current, the chip U1 operates the three-color indicator LED1, and the corresponding range of the residual current is displayed.
The power circuit 102 comprises a capacitor C4, a capacitor C5, a resistor R4, a resistor R6, a rectifier bridge B1, a voltage regulator tube VZ1 and a voltage dependent resistor RV1, one input end of the rectifier bridge B1 and one end of the piezoresistor RV1 are connected on a main loop, the other end of the piezoresistor RV1 is connected with one end of a trip coil KA in the trip circuit 104, the other input end of the rectifier bridge B1 is connected with one end of a resistor R6, the other end of the resistor R6 is connected with the other end of the trip coil KA through a capacitor C5, the positive output end of the rectifier bridge B1 is connected with one end of a resistor R4, the other end of the resistor R4 is connected with the positive electrode of the capacitor C4 and the cathode of a voltage stabilizing tube VZ1, the other end of the resistor R4 is connected to the chip U1 of the signal acquisition and processing circuit 105 as a power supply terminal, the power supply circuit 102 provides + 5V power supply voltage to the chip U1, and the cathode of the capacitor C4, the anode of the voltage regulator VZ1, and the cathode output terminal of the rectifier bridge B1 are connected to GND.
The test circuit 103 comprises a test button T, a test winding 108 and a resistor R12, the test button T, the test winding 108 and a capacitor R12 are sequentially connected in series to form a test circuit 103 connected into a main circuit, the test winding 108 is connected to the residual current transformer 101, the test circuit 103 is powered from the main circuit when the test button T is pressed down, and a simulated residual current is generated to detect whether the circuit breaker can normally operate or not.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (10)
1. The utility model provides a residual current operated circuit breaker, includes residual current transformer (101), signal acquisition processing circuit (105) and trip circuit (104), residual current transformer (101) are accepted and are used for gathering residual current signal and transmit the residual current signal who gathers to signal acquisition processing circuit (105) on the major loop, and when residual current value exceeded the rated residual current that signal acquisition processing circuit (105) set for, signal acquisition processing circuit (105) drive trip circuit (104) switch on and are used for cutting off the major loop, its characterized in that: the signal acquisition processing circuit (105) is also connected with an indicating circuit (106) with various indicating states, when the residual current value is less than the rated residual current set by the signal acquisition processing circuit (105), the signal acquisition processing circuit (105) triggers the indicating circuit (106) to operate, and the residual current is judged according to different indicating states.
2. A residual current operated circuit breaker according to claim 1, wherein: the indicator circuit (106) includes an indicator light controlled by the indicator circuit (106) having a plurality of indicator states and each indicator state corresponds to a different range of remaining current values.
3. A residual current operated circuit breaker according to claim 1, wherein: the main circuit is also connected with a test circuit (103), the test circuit (103) is connected with a residual current transformer (101), the test circuit (103) generates a simulation residual current signal, the residual current transformer (101) transmits the detected simulation residual current signal to a signal acquisition processing circuit (105), and the signal acquisition processing circuit (105) drives a tripping circuit (104) to be switched on and switched off the main circuit.
4. A residual current operated circuit breaker according to claim 1, wherein: the signal acquisition processing circuit (105) and the tripping circuit (104) are powered by a power circuit (102), the power circuit (102) is connected to the main loop, and the power circuit (102) performs voltage reduction processing on the voltage of the main loop and then supplies power to the signal acquisition processing circuit (105) and the tripping circuit (104).
5. A residual current operated circuit breaker according to any one of claims 1-2, wherein: the indicating circuit (106) comprises a resistor R1, a resistor R2, a resistor R3 and a three-color indicator light LED1, one ends of the resistor R1, the resistor R2 and the resistor R3 are connected to the signal acquisition processing circuit (105), the other ends of the resistor R1, the resistor R2 and the resistor R3 are connected with one end of the three-color indicator light LED1, and the other end of the three-color indicator light LED1 is connected with GND.
6. A residual current operated circuit breaker according to claim 1, wherein: the signal acquisition processing circuit (105) comprises a chip U1, and the chip U1 is a special residual current acquisition processing chip integrated with an operational amplifier.
7. A residual current operated circuit breaker according to claim 1, wherein: the signal acquisition processing circuit (105) comprises a chip U1, a resistor R5, a resistor R7, a resistor R8, a resistor R9, a capacitor C6, a capacitor C7 and a capacitor C7, wherein the chip U7 is respectively connected with an indicating circuit (106) and a tripping circuit (104), the resistor R7 and the resistor R7 are connected in parallel at two ends of a secondary winding (107) of a residual current transformer (101), one end of the resistor R7 is connected with one end of the resistor R7, the other end of the resistor R7 is connected with one end of the capacitor C7, one end of the capacitor C7 and a DN 7 pin of the chip U7, the other end of the resistor R7 is connected with the other end of the capacitor C7, one end of the capacitor C7 is connected with a DN 7 pin of the capacitor C7, and a TROA pin of the chip C7, and the TROA pin of the capacitor C7 are respectively connected with the TROA pin of the chip C7, and the TROA pin of the chip U7, The capacitor C8, the capacitor C9, the other end of the capacitor C10, and the GND pin of the chip U1 are connected to GND.
8. A residual current operated circuit breaker according to claim 1, wherein: trip circuit (104) include resistance R10, resistance R11, condenser C11, diode VD1, silicon controlled rectifier Q1 and be used for the trip coil KA of control main loop break-make, the one end and the signal acquisition processing circuit (105) of resistance R10 are connected, the other end and resistance R11 of resistance R10, the one end of condenser C11 and silicon controlled rectifier Q1's gate pole are connected, silicon controlled rectifier Q1's positive pole and diode VD 1's negative pole are connected, diode VD 1's positive pole and the one end of trip coil KA are connected, the other end of trip coil KA is connected on the main loop, resistance R11, the other end of capacitor C11 and silicon controlled rectifier Q1's negative pole are connected with GND.
9. A residual current operated circuit breaker according to claim 3, wherein: the testing circuit (103) comprises a testing button T, a testing winding (108) and a resistor R12, the testing button T, the testing winding (108) and a capacitor R12 are sequentially connected in series to form the testing circuit (103) connected into a main loop, and the testing winding (108) is connected to the residual current transformer (101).
10. A residual current operated circuit breaker according to claim 4, wherein: the power supply circuit (102) comprises a capacitor C4, a capacitor C5, a resistor R4, a resistor R6, a rectifier bridge B1, a voltage regulator tube VZ1 and a voltage dependent resistor RV1, one input end of the rectifier bridge B1 and one end of the piezoresistor RV1 are connected on a main loop, the other end of the piezoresistor RV1 is connected with one end of a trip coil KA in a trip circuit (104), the other input end of the rectifier bridge B1 is connected with one end of a resistor R6, the other end of the resistor R6 is connected with the other end of the trip coil KA through a capacitor C5, the positive output end of the rectifier bridge B1 is connected with one end of a resistor R4, the other end of the resistor R4 is connected with the positive electrode of the capacitor C4 and the cathode of a voltage stabilizing tube VZ1, the other end of the resistor R4 is connected with the signal acquisition processing circuit (105) as a power supply end, and the cathode of the capacitor C4, the anode of the voltage regulator tube VZ1 and the cathode output end of the rectifier bridge B1 are connected with GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022228751.2U CN214100834U (en) | 2020-10-09 | 2020-10-09 | Residual current operated circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022228751.2U CN214100834U (en) | 2020-10-09 | 2020-10-09 | Residual current operated circuit breaker |
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| Publication Number | Publication Date |
|---|---|
| CN214100834U true CN214100834U (en) | 2021-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022228751.2U Active CN214100834U (en) | 2020-10-09 | 2020-10-09 | Residual current operated circuit breaker |
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| CN (1) | CN214100834U (en) |
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