CN209765012U - Circuit breaker detection circuit - Google Patents
Circuit breaker detection circuit Download PDFInfo
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- CN209765012U CN209765012U CN201920222603.4U CN201920222603U CN209765012U CN 209765012 U CN209765012 U CN 209765012U CN 201920222603 U CN201920222603 U CN 201920222603U CN 209765012 U CN209765012 U CN 209765012U
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Abstract
The utility model relates to a circuit breaker detection circuitry, include: the device comprises a current transformer, a current sensor, a first voltage comparison module and an indication module; the current transformer comprises a primary side winding and a secondary side winding, the primary side winding is coupled with the secondary side winding, a first end of the primary side winding is used for being connected with a bus of the circuit breaker, a second end of the primary side winding is used for being connected with a load, a current sensor is coupled with the secondary side winding, the current sensor is connected with a positive phase input end of a first voltage comparison module, a negative phase input end of the first voltage comparison module is used for being connected with a first power supply, and an output end of the first voltage comparison module is connected with an indication module. When the breaker breaks the brake-separating fault in the brake-separating operation process, the first voltage comparison module generates a corresponding driving signal according to the voltage signal of the current sensor to drive the indication module to send an indication signal, so that electric equipment maintenance personnel can find that the breaker breaks the brake-separating fault, and the safety of the electric equipment maintenance personnel is ensured.
Description
Technical Field
The utility model relates to an electric power system detects technical field, especially relates to circuit breaker detection circuitry.
Background
The cubical switchboard generates electricity in electric power system, the transmission of electricity, distribution and electric energy conversion's in-process, play and open and shut, control and protection consumer's effect, the cubical switchboard is as the important facility of connecting electric wire netting and power consumer, its safety and stability operation has very important meaning to improving the power supply reliability, wherein box cubical switchboard operational environment is abominable, the easy bite phenomenon appears in the separating brake spring of the circuit breaker in the cubical switchboard, the circuit breaker breaks off the floodgate trouble promptly, lead to the circuit breaker can not divide the broken circuit, maintainer is difficult to directly judge whether electrified cable, the fortune dimension maintenance work of giving power equipment has brought certain potential safety hazard.
SUMMERY OF THE UTILITY MODEL
On this basis, it is necessary to provide a circuit breaker detection circuitry to the difficult problem that whether the breaking fault appears in the detection circuit breaker of maintainer, brings certain potential safety hazard for the maintainer.
A circuit breaker detection circuit comprising: the device comprises a current transformer, a current sensor, a first voltage comparison module and an indication module; the current transformer comprises a primary side winding and a secondary side winding, the primary side winding is coupled with the secondary side winding, a first end of the primary side winding is used for being connected with a bus of a circuit breaker, a second end of the primary side winding is used for being connected with a load, the current sensor is coupled with the secondary side winding, the current sensor is connected with a positive phase input end of the first voltage comparison module, a negative phase input end of the first voltage comparison module is used for being connected with a first power supply, and an output end of the first voltage comparison module is connected with the indication module.
in one embodiment, the current sensor is a hall current sensor.
In one embodiment, the indication module comprises a driving submodule and an indication lamp, wherein an input end of the driving submodule is connected with an output end of the first voltage comparison module, and an output end of the driving submodule is connected with the indication lamp.
In one embodiment, the circuit breaker detection circuit further comprises a first voltage division module, a second voltage division module, a rectification module and a second voltage comparison module, the second end of the primary side winding is connected with the first end of the first voltage division module, the second end of the first voltage division module is connected with the first end of the second voltage division module, the second end of the second voltage division module is used for connecting a load, the first end of the second voltage division module is also connected with the first input end of the rectification module, the second end of the second voltage-dividing sub-module is also connected with the second input end of the rectifying module, the output end of the rectifying module is connected with the positive phase input end of the second voltage comparison module, and the inverting input end of the second voltage comparison module is used for being connected with a second power supply, and the output end of the second voltage comparison module is connected with the indication module.
In one embodiment, the first voltage division module includes a voltage division capacitor C1, the second voltage division module includes a voltage division capacitor C2, the second end of the primary winding is configured to be connected to a load sequentially through the voltage division capacitor C1 and the voltage division capacitor C2, the first input end of the rectification module is connected to the first end of the voltage division capacitor C2, and the second input end of the rectification module is connected to the second input end of the voltage division capacitor C2.
In one embodiment, the circuit breaker detection circuit further includes a resistor R1 and a resistor R2, the output terminal of the rectifying module is connected to the non-inverting input terminal of the second voltage comparison module through the resistor R1, and the inverting input terminal of the second voltage comparison module is connected to the second power supply through the resistor R2.
In one embodiment, the circuit breaker detection circuit further includes an or gate module, a first input terminal of the or gate module is connected to the output terminal of the first voltage comparison module, a second input terminal of the or gate module is connected to the output terminal of the second voltage comparison module, and an output terminal of the or gate module is connected to the indication module.
In one embodiment, the current transformers include a first current transformer, a second current transformer and a third current transformer, the current sensors include a first current sensor, a second current sensor and a third current sensor, the first voltage comparison module includes a first voltage comparator, a second voltage comparator and a third voltage comparator, a first end of a primary winding of the first current transformer is used for connecting a first phase of a three-phase bus of the circuit breaker, a second end of the primary winding of the first current transformer is used for connecting a load, a secondary winding of the first current transformer is coupled with the first current sensor, the first current sensor is connected with a non-inverting input end of the first voltage comparator, an inverting input end of the first voltage comparator is used for connecting a first power supply, and an output end of the first voltage comparator is connected with an input end of the indication module, a first end of a primary winding of the second current transformer is used for connecting a second phase of a three-phase bus of the circuit breaker, a second end of the primary winding of the second current transformer is used for connecting a load, a secondary winding of the second current transformer is coupled with the second current sensor, the second current sensor is connected with a non-inverting input end of the second voltage comparator, an inverting input end of the second voltage comparator is used for connecting a first power supply, an output end of the second voltage comparator is connected with an input end of the indicating module, a first end of a primary winding of the third current transformer is used for connecting a third phase of the three-phase bus of the circuit breaker, a second end of a primary winding of the third current transformer is used for connecting the load, and a secondary winding of the third current transformer is coupled with the third current sensor, the third current sensor is connected with a positive phase input end of a third voltage comparator, an inverted phase input end of the third voltage comparator is used for being connected with a first power supply, and an output end of the third voltage comparator is connected with an input end of the indicating module.
In one embodiment, the circuit breaker detection circuit further includes an or gate module, an output terminal of the first voltage comparator is connected to a first input terminal of the or gate module, an output terminal of the second voltage comparator is connected to a second input terminal of the or gate module, an output terminal of the third voltage comparator is connected to a third input terminal of the or gate module, and an output terminal of the or gate module is connected to the indication module.
In one embodiment, the circuit breaker detection circuit further comprises a transformation module, an input end of the transformation module is used for being connected with a normally open contact of the circuit breaker, and an output end of the transformation module is connected with a power supply end of the indication module.
The circuit breaker detection circuit is characterized in that a bus of the circuit breaker is connected with a primary side of a current transformer, the primary side of the current transformer is also used for connecting a load, when the circuit breaker has a switching-off fault in the switching-off operation process, namely the circuit breaker is in a conducting state, the current transformer is in a power-on state and generates a corresponding current signal, a current sensor converts the current signal detected by the current transformer into a corresponding voltage signal and sends the voltage signal to a first voltage comparison module, when the voltage signal received by the first voltage comparison module is greater than the voltage of a first power supply, namely the voltage received by a positive phase input end of the first voltage comparison module is greater than the voltage received by a reverse phase input end of the first voltage comparison module, the first voltage comparison module sends a driving signal to drive an indication module to send an indication signal, so that a power equipment maintainer can find that the circuit breaker has, the breaker opening fault detection is realized, and the safety of power equipment maintenance personnel is ensured.
Drawings
FIG. 1 is a block diagram of a circuit breaker detection circuit according to one embodiment;
FIG. 2 is a block diagram of a circuit breaker detection circuit according to another embodiment;
FIG. 3 is a circuit schematic of a circuit breaker detection circuit in one embodiment;
Fig. 4 is a circuit schematic of a circuit breaker detection circuit in another embodiment.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
For example, a circuit breaker detection circuit is provided, which comprises a current transformer, a current sensor, a first voltage comparison module and an indication module; the current transformer comprises a primary side winding and a secondary side winding, the primary side winding is coupled with the secondary side winding, a first end of the primary side winding is used for being connected with a bus of a circuit breaker, a second end of the primary side winding is used for being connected with a load, the current sensor is coupled with the secondary side winding, the current sensor is connected with a positive phase input end of the first voltage comparison module, a negative phase input end of the first voltage comparison module is used for being connected with a first power supply, and an output end of the first voltage comparison module is connected with the indication module.
The circuit breaker detection circuit is characterized in that a bus of the circuit breaker is connected with a primary side of a current transformer, the primary side of the current transformer is also used for connecting a load, when the circuit breaker has a switching-off fault in the switching-off operation process, namely the circuit breaker is in a conducting state, the current transformer is in a power-on state and generates a corresponding current signal, a current sensor converts the current signal detected by the current transformer into a corresponding voltage signal and sends the voltage signal to a first voltage comparison module, when the voltage signal received by the first voltage comparison module is greater than the voltage of a first power supply, namely the voltage received by a positive phase input end of the first voltage comparison module is greater than the voltage received by a reverse phase input end of the first voltage comparison module, the first voltage comparison module sends a driving signal to drive an indication module to send an indication signal, so that a power equipment maintainer can find that the circuit breaker has, the breaker opening fault detection is realized, and the safety of power equipment maintenance personnel is ensured.
In one embodiment, referring to fig. 1, a circuit breaker detection circuit 10 includes a current transformer 100, a current sensor 200, a first voltage comparison module 300, and an indication module 400; the current transformer 100 includes a primary winding 101 and a secondary winding 102, the primary winding 101 is coupled to the secondary winding 102, a first end of the primary winding 101 is used for connecting a bus of a circuit breaker, a second end of the primary winding 101 is used for connecting a load, the current sensor 200 is coupled to the secondary winding 102, the current sensor 200 is connected to a non-inverting input terminal of the first voltage comparison module 300, an inverting input terminal of the first voltage comparison module 300 is used for connecting a first power source, and an output terminal of the first voltage comparison module 300 is connected to the indication module 400.
Specifically, the circuit breaker is also used for connecting a power supply, and when the circuit breaker is in a conducting state, the current transformer and the load are in a power-on state.
In one embodiment, the first voltage comparison module comprises a first voltage comparator, and the first voltage comparator operates according to the following principle: when the voltage of the non-inverting input terminal of the first voltage comparator is greater than the voltage of the inverting input terminal of the first voltage comparator, the output terminal of the first voltage comparator outputs a high level signal.
In one embodiment, the first power source is 5V dc.
it should be mentioned that, when the breaker is in the opening state, the breaker is in the off state, and when the breaker is in the closing state, the breaker is in the on state, so, when the breaker breaks the opening fault in the opening operation process, that is, the breaker does not complete the opening operation, and at this moment, the breaker is still in the closing state, and the breaker is in the on state, then the current transformer and the load are in the power-on state.
The circuit breaker detection circuit is characterized in that a bus of the circuit breaker is connected with a primary side of a current transformer, the primary side of the current transformer is also used for connecting a load, when the circuit breaker has a switching-off fault in the switching-off operation process, namely the circuit breaker is in a conducting state, the current transformer is in a power-on state and generates a corresponding current signal, a current sensor converts the current signal detected by the current transformer into a corresponding voltage signal and sends the voltage signal to a first voltage comparison module, when the voltage signal received by the first voltage comparison module is greater than the voltage of a first power supply, namely the voltage received by a positive phase input end of the first voltage comparison module is greater than the voltage received by a reverse phase input end of the first voltage comparison module, the first voltage comparison module sends a driving signal to drive an indication module to send an indication signal, so that a power equipment maintainer can find that the circuit breaker has, the breaker opening fault detection is realized, and the safety of power equipment maintenance personnel is ensured.
For the detection accuracy of the circuit breaker detection circuit, in one embodiment, the current sensor is a hall current sensor. Specifically, the Hall current sensor is based on a magnetic balance type Hall principle, the voltage corresponding to the conductor is indirectly measured by measuring the potential of the Hall, the Hall current sensor has the characteristics of high precision and good linearity, and the Hall current sensor is not in contact with a measured circuit and does not influence the measured circuit, namely the Hall current sensor does not influence the current transformer, so that the voltage signal of a secondary side winding of the current transformer can be accurately measured by arranging the Hall current sensor, and the detection accuracy is improved.
In order to facilitate the user to find that the breaker has the opening fault, in one embodiment, referring to fig. 2, the indication module 400 includes a driving sub-module 410 and an indication lamp 420, an input terminal of the driving sub-module 410 is connected to an output terminal of the first voltage comparison module 300, and an output terminal of the driving sub-module 410 is connected to the indication lamp 420. Through setting up such instruction module, when the breaker breaks off the floodgate trouble at the in-process of separating brake operation, then first voltage comparison module output drive signal to with drive signal transmission to drive submodule piece, so that drive submodule piece drive pilot lamp shines, thereby the user's breaker of being convenient for breaks off the floodgate trouble.
In one embodiment, referring to fig. 3, the driving sub-module 410 includes a decoder U5, a photo coupler U6, a resistor R3 and a resistor R4, an input terminal of the decoder U5 is connected to an output terminal of the first voltage comparing module 300, an output terminal of the decoder U5 is connected to a first input terminal of the photo coupler U6, a second input terminal of the photo coupler U6 is connected to a third power source through the resistor R3, a first output terminal of the photo coupler U6 is connected to a fourth power source through the resistor R4, and a second output terminal of the photo coupler U6 is connected to the indicator light 420. In one embodiment, the third power supply is 5V dc, the fourth power supply is 24V dc, in one embodiment, the decoder is 74LS139, in one embodiment, the photocoupler is TLP281, and by providing such a driving submodule, when the first voltage comparison module outputs the driving signal, the driving signal passes through the decoder and outputs a high level signal, and sends the high level signal to the photocoupler, and the photocoupler drives the indicator light to light according to the received high level signal.
In order to facilitate a user to find that the breaker has an opening fault, in one embodiment, the indication module comprises a driving submodule and a buzzer, the input end of the driving submodule is connected with the output end of the first voltage comparison module, the output end of the driving submodule is connected with the buzzer, and when the breaker has the opening fault in the opening operation process, the first voltage comparison module outputs a driving signal so that the driving submodule drives the buzzer to send an alarm signal, thereby facilitating the user to find that the breaker has the opening fault.
In order to further improve the accuracy of the breaker opening fault detection, in one embodiment, referring to fig. 2, the breaker detection circuit 10 further includes a first voltage dividing module 510, a second voltage dividing module 520, a rectifying module 600, and a second voltage comparing module 700, wherein a second end of the primary winding 101 is connected to a first end of the first voltage dividing module 510, a second end of the first voltage dividing module 510 is connected to a first end of the second voltage dividing module 520, a second end of the second voltage dividing module 520 is used for connecting to a load, a first end of the second voltage dividing module 520 is further connected to a first input end of the rectifying module 600, a second end of the second voltage dividing module 520 is further connected to a second input end of the rectifying module 600, an output end of the rectifying module 600 is connected to a non-inverting input end of the second voltage comparing module 700, the inverting input terminal of the second voltage comparing module 700 is used for connecting to a second power supply, and the output terminal of the second voltage comparing module 700 is connected to the indicating module 400. In one embodiment, the second power source is 5V dc. When the circuit breaker has an opening fault, the primary side winding of the current transformer has voltage, the second end of the primary side winding of the current transformer is sequentially connected with the first voltage division module and the second voltage division module, so that the voltages at the two ends of the second voltage division module reach the detection range of the second voltage comparison module, the rectifying module converts the alternating current of the second voltage division module into direct current and sends the direct current to the second voltage comparison module, the second voltage comparison module detects that the voltages at the two ends of the second voltage division module are larger than the voltage of the second power supply, the second voltage comparison module sends out a driving signal, and the driving indication module sends out an indication signal to remind a user that the primary side winding of the current transformer has voltage, so that the voltage of the primary side winding of the circuit transformer is checked, and the accuracy of the opening fault of the circuit breaker is further improved.
In order to better enable the second voltage comparison module to detect the voltage existing on the primary side winding. In one embodiment, referring to fig. 3, the first voltage division module 510 is a voltage division capacitor C1, the second voltage division module 520 is a voltage division capacitor C2, the second end of the primary winding 101 is configured to be connected to a load sequentially through the voltage division capacitor C1 and the voltage division capacitor C2, the second end of the primary winding 101 is connected to the first end of the voltage division capacitor C1, the second end of the voltage division capacitor C1 is connected to the first end of the voltage division capacitor C2, the second end of the voltage division capacitor C2 is configured to be connected to the load, the first input end of the rectifier module is connected to the first end of the voltage division capacitor C2, and the second input end of the rectifier module is connected to the second input end of the voltage division capacitor C2. The voltage of the two ends of the voltage-dividing capacitor C2 is divided by the voltage-dividing capacitor C1 by serially connecting the voltage-dividing capacitor C1 and the voltage-dividing capacitor C2 in the primary side winding loop, so that the voltage of the two ends of the voltage-dividing capacitor C2 is within the working range of the second voltage comparison module, and the second voltage comparison module can better detect the voltage of the primary side winding.
in order to better enable the second voltage comparison module to detect the voltage existing on the primary side winding. In one embodiment, the first voltage dividing module is a first resistor, the second voltage dividing module is a second resistor, the second end of the primary winding is configured to be connected to a load sequentially through the first resistor and the second resistor, the first input end of the rectifying module is connected to the first end of the second resistor, and the second input end of the rectifying module is connected to the second end of the second resistor. The first resistor and the second resistor are connected in series in the primary side winding loop, and the voltage at two ends of the second resistor is divided by the first resistor, so that the voltage at two ends of the second resistor is within the working range of the second voltage comparison module, and the second voltage comparison module can better detect the voltage existing in the primary side winding.
In order to better enable the second voltage comparison module to operate normally, in one embodiment, referring to fig. 3, the circuit breaker detection circuit 10 further includes a resistor R1 and a resistor R2, an output terminal of the rectification module 600 is connected to a non-inverting input terminal of the second voltage comparison module 700 through the resistor R1, and an inverting input terminal of the second voltage comparison module 700 is connected to the second power supply through the resistor R2. In one embodiment, the resistance R1 is equal to the resistance R2. By connecting the resistor R1 in series with the non-inverting input terminal of the second voltage comparison module, the voltage output by the rectification module is divided by the resistor R1, and the voltage of the second voltage division module detected by the second voltage comparison module is reduced to the working range of the second voltage comparison module, so that the second voltage comparison module can work normally.
In order to better realize the detection of the voltage or the current existing in the primary winding, in one embodiment, referring to fig. 3, the circuit breaker detection module 10 further includes an or gate module 800, a first input terminal of the or gate module 800 is connected to the output terminal of the first voltage comparison module 300, a second input terminal of the or gate module 800 is connected to the output terminal of the second voltage comparison module 700, and an output terminal of the or gate module 800 is connected to the indication module 400. Through the arrangement of the OR gate module, when the first voltage comparison module or the second voltage comparison module outputs the driving signal, the indicating module can be driven to send out the indicating signal, so that the detection of the voltage or the current existing in the primary side winding is better realized.
In order to realize the open-circuit fault detection of the circuit breaker in the three-phase alternating current, in one embodiment, please refer to fig. 4, the current transformer 100 includes a first current transformer 110, a second current transformer 120 and a third current transformer 130, the current sensor 200 includes a first current sensor 210, a second current sensor 220 and a third current sensor 230, the first voltage comparison module 300 includes a first voltage comparator U1, a second voltage comparator U2 and a third voltage comparator U3, a first end of a primary winding of the first current transformer 110 is used for connecting a first phase of a three-phase bus of the circuit breaker, a second end of the primary winding of the first current transformer 110 is used for connecting a load, a secondary winding of the first current transformer 110 is coupled to the first current sensor 210, the first current sensor 210 is connected to a positive input end of the first voltage comparator U1, an inverting input terminal of the first voltage comparator U1 is configured to be connected to a first power source, an output terminal of the first voltage comparator U1 is connected to an input terminal of the indication module 400, a first terminal of a primary winding of the second current transformer 120 is configured to be connected to a second phase of a three-phase bus of the circuit breaker, a second terminal of a primary winding of the second current transformer 120 is configured to be connected to a load, a secondary winding of the second current transformer 120 is coupled to the second current sensor 220, the second current sensor 220 is connected to a non-inverting input terminal of the second voltage comparator U2, an inverting input terminal of the second voltage comparator U2 is configured to be connected to the first power source, an output terminal of the second voltage comparator U2 is connected to an input terminal of the indication module 400, and a first terminal of a primary winding of the third current transformer 130 is configured to be connected to a third phase of the three-phase bus of the circuit breaker, the second end of the primary winding of the third current transformer 130 is used for connecting a load, the secondary winding of the third current transformer 130 is coupled to the third current sensor 230, the third current sensor 230 is connected to the positive input terminal of the third voltage comparator U3, the negative input terminal of the third voltage comparator U3 is used for connecting a first power source, and the output terminal of the third voltage comparator U3 is connected to the input terminal of the indicating module 400. Specifically, the first phase of the three-phase bus of circuit breaker is connected with the first phase of three-phase alternating current, the second phase of the three-phase bus of circuit breaker is connected with the second phase of three-phase alternating current, the third phase of the three-phase bus of circuit breaker is connected with the third phase of three-phase alternating current, through setting up three current transformer, three current sensor and three voltage comparator, when the separating brake trouble appears in arbitrary separating brake coil of circuit breaker, all can be at least one output drive signal in the three voltage comparator, send indicating signal with drive indicating module, thereby realize the separating brake fault detection of circuit breaker in three-phase alternating current.
in order to better realize the circuit breaker opening fault detection in the three-phase alternating current, in one embodiment, referring to fig. 4, the circuit breaker detection circuit 10 further includes an or gate module 800, an output terminal of the first voltage comparator U1 is connected to a first input terminal of the or gate module 800, an output terminal of the second voltage comparator U2 is connected to a second input terminal of the or gate module 800, an output terminal of the third voltage comparator U3 is connected to a third input terminal of the or gate module 800, and an output terminal of the or gate module 800 is connected to the indication module 400. In one embodiment, the output terminal of the second voltage comparison module is connected to the fourth input terminal of the or gate module. Through setting up or the gate module, then when at least one voltage comparator exports drive signal in the three voltage comparator, or the gate module all can export high level signal and send indicating signal with drive indicating module, has also avoided a plurality of voltage comparison module to export drive signal stack simultaneously, and the drive signal that leads to flowing through indicating module passes, damages indicating module to the better realization is at three-phase alternating current breaker separating brake fault detection.
In order to implement the indicating module without additional connection of a power supply and optimize the circuit, in one embodiment, please refer to fig. 4, the circuit breaker detecting circuit 10 further includes a transforming module 900, an input end of the transforming module 900 is used for connecting a normally open contact of the circuit breaker, and an output end of the transforming module 900 is connected to a power supply end of the indicating module 400. The input end of the transformation module is connected with the normally open contact of the circuit breaker, when the circuit breaker breaks the brake-separating fault in the brake-separating operation process, the circuit breaker is in a conducting state, the input end of the transformation module is connected with the power supply, the power supply is provided for the indication module through the transformation module, so that the indication module works normally, the indication module does not need an additional external power supply, and circuit optimization is achieved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A circuit breaker detection circuit, comprising: the device comprises a current transformer, a current sensor, a first voltage comparison module and an indication module;
The current transformer comprises a primary side winding and a secondary side winding, the primary side winding is coupled with the secondary side winding, a first end of the primary side winding is used for being connected with a bus of a circuit breaker, a second end of the primary side winding is used for being connected with a load, the current sensor is coupled with the secondary side winding, the current sensor is connected with a positive phase input end of the first voltage comparison module, a negative phase input end of the first voltage comparison module is used for being connected with a first power supply, and an output end of the first voltage comparison module is connected with the indication module.
2. The circuit breaker detection circuit of claim 1, wherein the current sensor is a hall current sensor.
3. The circuit breaker detection circuit of claim 1, wherein the indication module comprises a driver sub-module and an indicator light, an input of the driver sub-module is connected to an output of the first voltage comparison module, and an output of the driver sub-module is connected to the indicator light.
4. The circuit breaker detection circuit of claim 1, further comprising a first voltage division module, a second voltage division module, a rectification module, and a second voltage comparison module, the second end of the primary side winding is connected with the first end of the first voltage division module, the second end of the first voltage division module is connected with the first end of the second voltage division module, the second end of the second voltage division module is used for connecting a load, the first end of the second voltage division module is also connected with the first input end of the rectification module, the second end of the second voltage-dividing sub-module is also connected with the second input end of the rectifying module, the output end of the rectifying module is connected with the positive phase input end of the second voltage comparison module, and the inverting input end of the second voltage comparison module is used for being connected with a second power supply, and the output end of the second voltage comparison module is connected with the indication module.
5. The circuit breaker detection circuit according to claim 4, wherein the first voltage-dividing module comprises a voltage-dividing capacitor C1, the second voltage-dividing module comprises a voltage-dividing capacitor C2, the second end of the primary winding is configured to be connected to a load sequentially through the voltage-dividing capacitor C1 and the voltage-dividing capacitor C2, the first input end of the rectifier module is connected to the first end of the voltage-dividing capacitor C2, and the second input end of the rectifier module is connected to the second input end of the voltage-dividing capacitor C2.
6. The circuit breaker detection circuit of claim 4, further comprising a resistor R1 and a resistor R2, wherein the output of the rectifying module is connected to the non-inverting input of the second voltage comparison module through the resistor R1, and wherein the inverting input of the second voltage comparison module is connected to the second power source through the resistor R2.
7. The circuit breaker detection circuit of claim 4, further comprising an OR gate module, a first input of the OR gate module being connected to the output of the first voltage comparison module, a second input of the OR gate module being connected to the output of the second voltage comparison module, and an output of the OR gate module being connected to the indication module.
8. The circuit breaker detection circuit according to any one of claims 1 to 6, wherein the current transformers comprise a first current transformer, a second current transformer and a third current transformer, the current sensors comprise a first current sensor, a second current sensor and a third current sensor, the first voltage comparison module comprises a first voltage comparator, a second voltage comparator and a third voltage comparator, a first end of a primary winding of the first current transformer is used for connecting a first phase of a three-phase bus of the circuit breaker, a second end of a primary winding of the first current transformer is used for connecting a load, a secondary winding of the first current transformer is coupled with the first current sensor, the first current sensor is connected with a non-inverting input end of the first voltage comparator, and an inverting input end of the first voltage comparator is used for connecting a first power supply, the output end of the first voltage comparator is connected with the input end of the indicating module, the first end of the primary winding of the second current transformer is used for connecting the second phase of the three-phase bus of the circuit breaker, the second end of the primary winding of the second current transformer is used for connecting a load, the secondary winding of the second current transformer is coupled with the second current sensor, the second current sensor is connected with the non-inverting input end of the second voltage comparator, the inverting input end of the second voltage comparator is used for connecting a first power supply, the output end of the second voltage comparator is connected with the input end of the indicating module, the first end of the primary winding of the third current transformer is used for connecting the third phase of the three-phase bus of the circuit breaker, and the second end of the primary winding of the third current transformer is used for connecting the load, a secondary side winding of the third current transformer is coupled with the third current sensor, the third current sensor is connected with a positive phase input end of a third voltage comparator, a negative phase input end of the third voltage comparator is used for being connected with a first power supply, and an output end of the third voltage comparator is connected with an input end of the indicating module.
9. The circuit breaker detection circuit of claim 8, further comprising an or gate module, wherein an output of the first voltage comparator is connected to a first input of the or gate module, an output of the second voltage comparator is connected to a second input of the or gate module, an output of the third voltage comparator is connected to a third input of the or gate module, and an output of the or gate module is connected to the indication module.
10. The circuit breaker detection circuit according to claim 1, further comprising a transforming module, wherein an input end of the transforming module is used for connecting with a normally open contact of the circuit breaker, and an output end of the transforming module is connected with a power end of the indicating module.
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|---|---|---|---|
| CN201920222603.4U CN209765012U (en) | 2019-02-22 | 2019-02-22 | Circuit breaker detection circuit |
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| CN201920222603.4U CN209765012U (en) | 2019-02-22 | 2019-02-22 | Circuit breaker detection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110988669A (en) * | 2019-12-24 | 2020-04-10 | 山东钢铁股份有限公司 | Fault detection method and device for high-voltage circuit breaker |
| CN112053890A (en) * | 2020-09-24 | 2020-12-08 | 张家港宏昌钢板有限公司 | High-voltage vacuum switch fault early warning method and system |
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2019
- 2019-02-22 CN CN201920222603.4U patent/CN209765012U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110988669A (en) * | 2019-12-24 | 2020-04-10 | 山东钢铁股份有限公司 | Fault detection method and device for high-voltage circuit breaker |
| CN112053890A (en) * | 2020-09-24 | 2020-12-08 | 张家港宏昌钢板有限公司 | High-voltage vacuum switch fault early warning method and system |
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Effective date of registration: 20201012 Address after: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Address before: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee before: GUANGZHOU POWER SUPPLY Co.,Ltd. |