CN217956667U - Direct current arc fault monitoring system, circuit breaker equipment and motor equipment - Google Patents
Direct current arc fault monitoring system, circuit breaker equipment and motor equipment Download PDFInfo
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- CN217956667U CN217956667U CN202222051779.2U CN202222051779U CN217956667U CN 217956667 U CN217956667 U CN 217956667U CN 202222051779 U CN202222051779 U CN 202222051779U CN 217956667 U CN217956667 U CN 217956667U
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Abstract
The embodiment of the utility model discloses direct current arc fault monitoring system, circuit breaker equipment and electrical equipment, the system includes: the current sampling unit, the signal regulating unit, the control unit, the tripping driving unit and the tripping unit are connected in sequence; the current sampling unit is used for connecting a direct current load and collecting a current signal in the direct current load; the signal adjusting unit comprises a first amplifying circuit and a second amplifying circuit, the input end of the first amplifying circuit is connected with the current sampling unit, the output end of the first amplifying circuit is connected with the input end of the second amplifying circuit, and the output end of the second amplifying circuit is connected with the control unit; the signal output end of the control unit is connected with the tripping driving unit; the tripping driving unit is used for controlling the tripping unit to trip according to a tripping control signal sent by the control unit. The utility model discloses do not receive the front end DC power supply input to influence, arc fault in can the accurate monitoring DC load to in time carry out fault handling.
Description
Technical Field
The utility model relates to a power electronic technology field especially relates to a direct current arc fault monitoring system, circuit breaker equipment and electrical equipment.
Background
With the development of power electronic technology, the direct current power supply technology has a good development prospect under the background of energy revolution. In recent years, a fire due to leakage has been generated, and such a fire is more concealed than a fire due to a short circuit or the like, and is difficult to recognize after a fire, and thus cannot be prevented in advance. It is one of the important tasks of current electrical fire prevention work to fully understand the fire hazard of electric leakage and strengthen the technical prevention measures for electric leakage.
In a direct current power supply system, insulation damage, looseness of metal joints, aging of elements, or biting of animals and the like exist, and a direct current arc fault may occur in the system, so that fire hazard occurs. The direct current arc does not have the periodic zero-crossing characteristic of the alternating current arc, and once the direct current arc is generated, the direct current arc is difficult to extinguish by itself, so that the direct current arc fault has more harm than the alternating current arc fault.
Therefore, a need exists for a circuit fault monitoring scheme that can detect arc faults in a dc power source.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the embodiment of the application provides a direct current arc fault monitoring system, circuit breaker equipment and motor equipment, and the specific scheme is as follows:
in a first aspect, an embodiment of the present application provides a dc arc fault monitoring system, where the dc arc fault monitoring system includes:
the current sampling unit, the signal regulating unit, the control unit, the tripping driving unit and the tripping unit are connected in sequence;
the current sampling unit is connected with a direct current load, the output end of the current sampling unit is connected with the input end of the signal regulating unit, and the current sampling unit is used for converting a current signal in the direct current load into a direct current voltage signal and sending the direct current voltage signal to the signal regulating unit;
the signal regulating unit comprises a first amplifying circuit and a second amplifying circuit, the input end of the first amplifying circuit is used as the input end of the signal regulating unit and is connected with the current sampling unit, the output end of the first amplifying circuit is connected with the input end of the second amplifying circuit, and the output end of the second amplifying circuit is connected with the control unit;
the signal output end of the control unit is connected with the tripping driving unit, and the control unit is used for sending a tripping control signal to the tripping driving unit;
the tripping driving unit is used for controlling the tripping unit to trip according to the tripping control signal.
According to a specific implementation manner of the embodiment of the present application, the dc arc fault monitoring system further includes: the leakage monitoring device comprises a leakage testing unit and a leakage monitoring unit;
the electric leakage testing unit comprises a testing switch and a load resistor, one end of the testing switch is connected with a low-voltage direct-current power supply signal through the load resistor, and the other end of the testing switch is grounded;
the leakage monitoring unit comprises a fluxgate monitoring interface and a leakage monitoring chip, and the leakage monitoring chip is used for receiving the leakage signal on the test switch through the fluxgate monitoring interface and sending a tripping control signal to the tripping driving unit through a signal output end of the leakage monitoring chip.
According to a specific implementation manner of the embodiment of the present application, the first amplifying circuit is a differential amplifying circuit or an instrument amplifying circuit, and the second amplifying circuit is a unidirectional input amplifying circuit.
According to a specific implementation manner of the embodiment of the application, the tripping driving unit comprises a first controllable silicon and a second controllable silicon;
the anode of the first controlled silicon is connected with the reverse input end of the tripping unit, and the cathode of the first controlled silicon is respectively connected with the anode of the second controlled silicon and the power supply end of the leakage monitoring chip;
and the cathode of the second controllable silicon is respectively connected with the signal output end of the electric leakage monitoring chip and the signal output end of the control unit.
According to a specific implementation manner of the embodiment of the present application, the dc arc fault monitoring system further includes a dc power supply unit;
the direct current power supply unit comprises a direct current signal access module, an optical coupling feedback module, a transformer module and a voltage output module;
the direct current signal access module is used for accessing a high-voltage direct current signal, the input end of the transformer module is respectively connected with the direct current signal access module and the switch control end of the optocoupler feedback module, and the output end of the transformer module is connected with the input end of the voltage output module;
the testing end of the optocoupler feedback module is connected with the input end of the voltage output module;
the output end of the voltage output module is respectively connected with the signal regulating unit, the control unit and the electric leakage monitoring unit.
According to a specific implementation manner of the embodiment of the application, the direct current arc fault monitoring system further comprises an alarm unit, wherein the alarm unit is connected with the control unit and is used for performing alarm processing according to the fault signal sent by the control unit.
According to a specific implementation manner of the embodiment of the present application, the dc arc fault monitoring system further includes a storage unit, the storage unit is connected to the control unit, and the storage unit is configured to store the event information sent by the control unit.
According to a specific implementation manner of the embodiment of the application, the direct current arc fault monitoring system further comprises a communication unit, wherein the communication unit is connected with the control unit, and the control unit is used for carrying out data communication through the communication unit.
In a second aspect, an embodiment of the present application provides a circuit breaker device, where the circuit breaker device includes the dc arc fault monitoring system described in any of the foregoing first aspect and the embodiments of the first aspect.
In a third aspect, the present embodiments provide an electrical machine apparatus including the dc arc fault monitoring system according to the second aspect.
The embodiment of the application provides a direct current arc fault monitoring system, circuit breaker equipment and electrical equipment, the system includes: the current sampling unit, the signal regulating unit, the control unit, the tripping driving unit and the tripping unit are connected in sequence; the current sampling unit is used for connecting a direct current load and collecting a current signal in the direct current load; the signal adjusting unit comprises a first amplifying circuit and a second amplifying circuit, the input end of the first amplifying circuit is connected with the current sampling unit, the output end of the first amplifying circuit is connected with the input end of the second amplifying circuit, and the output end of the second amplifying circuit is connected with the control unit; the signal output end of the control unit is connected with the tripping driving unit; the tripping driving unit is used for controlling the tripping unit to trip according to the tripping control signal sent by the control unit. The utility model discloses do not receive the front end DC power supply input to influence, arc fault in can the accurate monitoring DC load to in time carry out fault handling.
Drawings
In order to illustrate the technical solution of the present invention more clearly, the drawings that are needed in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention. Like components are numbered similarly in the various figures.
FIG. 1 illustrates one of the block schematic diagrams of a DC arc fault monitoring system provided by the embodiments of the present application;
FIG. 2 is a schematic diagram illustrating a circuit connection of a current sampling unit and a signal conditioning unit of a DC arc fault monitoring system according to an embodiment of the present disclosure;
fig. 3 is a schematic circuit connection diagram illustrating a leakage detecting unit and a trip driving unit of a dc arc fault monitoring system according to an embodiment of the present disclosure;
fig. 4 illustrates a second module schematic diagram of a dc arc fault monitoring system according to an embodiment of the present disclosure;
FIG. 5 is a schematic circuit diagram illustrating a leakage test unit of a DC arc fault monitoring system according to an embodiment of the present disclosure;
fig. 6 shows a third module schematic diagram of a dc arc fault monitoring system according to an embodiment of the present application.
Summary of reference numerals:
a current sampling unit-110; signal conditioning unit-120; a control unit-130; a trip driving unit-140; a trip unit-150;
a leakage test unit-210; a leakage monitoring unit-220; a communication unit-310; a storage unit-410; alarm unit-510.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present invention, are only intended to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
Referring to fig. 1, a module schematic diagram of a dc arc fault monitoring system provided in an embodiment of the present application is shown, and as shown in fig. 1, the dc arc fault monitoring system provided in the embodiment of the present application includes:
the current sampling unit 110, the signal conditioning unit 120, the control unit 130, the trip driving unit 140 and the trip unit 150 are connected in sequence;
the current sampling unit 110 is configured to be connected to a dc load, an output end of the current sampling unit 110 is connected to an input end of the signal conditioning unit 120, and the current sampling unit 110 is configured to convert a current signal in the dc load into a dc voltage signal and send the dc voltage signal to the signal conditioning unit 120;
the signal conditioning unit 120 includes a first amplifying circuit and a second amplifying circuit, an input end of the first amplifying circuit is connected to the current sampling unit 110 as an input end of the signal conditioning unit 120, an output end of the first amplifying circuit is connected to an input end of the second amplifying circuit, and an output end of the second amplifying circuit is connected to the control unit 130;
a signal output end of the control unit 130 is connected to the trip driving unit 140, and the control unit 130 is configured to send a trip control signal to the trip driving unit 140;
the trip driving unit 140 is configured to control the trip unit 150 to trip according to the trip control signal.
In a specific embodiment, the dc arc fault monitoring system implements dc arc fault detection and dc arc fault protection for a dc load through the current sampling unit 110, the signal conditioning unit 120, the control unit 130, the trip driving unit 140, and the trip unit 150.
As shown in fig. 1, the current sampling unit 110, the signal conditioning unit 120, the control unit 130, the trip driving unit 140, and the trip unit 150 are sequentially connected.
Specifically, the current sampling unit 110 is disposed at a dc input end of the dc load, and converts a current signal of the load current into a voltage input signal through the manganin shunt, thereby implementing current sampling of the dc load.
As shown in fig. 2, the manganin shunt J1 converts a current signal in the dc load into a voltage input signal, and then sends the voltage input signal to the multistage amplification circuit.
The coil J1 in fig. 2 may be a manganin shunt, or may be another current collecting device, and may be adaptively replaced according to an actual application scenario.
The positive output end and the reverse output end of the manganin shunt J1 are also connected with a piezoresistor RV1 in parallel to serve as an overvoltage protection device, and when a voltage input signal sent by the manganin shunt J1 is too large, partial pressure release is realized through the voltage resistance change characteristic of the piezoresistor RV1, so that the situation that the voltage input signal is overvoltage to damage a rear-stage circuit is avoided.
The signal conditioning circuit includes a first amplification circuit and a second amplification circuit as shown in fig. 2.
According to a specific implementation manner of the embodiment of the present application, the first amplifying circuit is a differential amplifying circuit or an instrument amplifying circuit, and the second amplifying circuit is a unidirectional input amplifying circuit.
In a specific embodiment, the first amplifying circuit may be a differential input first-stage amplifying circuit, and the differential input first-stage amplifying circuit adopts a high-precision operational amplifier chip U1A to perform first-stage amplification on the original sampling voltage acquired by the manganin shunt J1 in a differential input signal manner. The power supply of the operational amplifier chip U1 adopts a single power supply mode, and a 3.3V power supply voltage signal is accessed.
The second amplifier circuit can be syntropy one-level amplifier circuit, syntropy one-level amplifier circuit adopts high-accuracy operational amplifier chip U1B, inputs the sampling voltage after having passed through differential amplification at operational amplifier chip U1B's positive input. The same-direction one-stage amplifying circuit also performs one-stage amplification, and the power supply of the operational amplifier chip U2 adopts a single power supply mode.
Specifically, the amplification ratios of the first amplification circuit and the second amplification circuit may be adaptively replaced according to an actual application scenario, and the embodiment does not specifically limit the amplification ratios of the first amplification circuit and the second amplification circuit.
The first amplifying circuit can also adopt an instrument amplifying circuit, and the instrument amplifying circuit can obtain better common mode rejection ratio, lower signal noise and better linearity while differential signals are input.
A user can adaptively select the differential amplifying circuit or the instrument amplifying circuit according to the precision requirement and the cost requirement on circuit monitoring in an actual application scene. This embodiment is not limited to this.
The output end of the second amplifying circuit is connected to the analog-to-digital conversion input interface MCU _ ADC of the control unit 130.
Specifically, the control unit 130 may be an MCU microprocessor control unit, and the MCU microprocessor control unit is composed of an ARM chip and necessary peripheral circuits thereof.
The control unit 130 is configured to identify an input voltage signal of the analog-to-digital conversion input interface MCU _ ADC, and when the input voltage signal is abnormal, it indicates that a dc arc fault occurs in the dc load, and the control unit 130 sends a trip control signal to the trip driving unit 140.
Specifically, as shown in fig. 3, the control unit 130 sends a high-level trip control signal to the trip driving unit 140 through the I/O terminal TP19 to control the trip driving unit 140 and the trip unit 150 to jointly perform a trip operation. For the specific implementation process of the trip driving unit 140 and the trip unit 150, reference may be made to the specific implementation process of the leakage monitoring unit 220 sending the trip control signal in the foregoing embodiment, and details are not described here again.
A diode D2 is further included between the control unit 130 and the trip driving unit 140, an anode of the diode D2 is connected to the output terminal of the control unit 130, a cathode of the diode D2 is connected to the trip driving unit 140, and the diode D2 is used for preventing a voltage signal from flowing back.
According to the embodiment of the application, the voltage sampling signal is amplified and adjusted through the differential input amplifying circuit and the in-phase input amplifying circuit, the stability of the amplified signal is guaranteed while high gain is achieved, the null shift is smaller, and a larger gain bandwidth can be obtained.
According to a specific implementation manner of the embodiment of the present application, the dc arc fault monitoring system further includes: a leakage test unit 210 and a leakage monitor unit 220;
the leakage testing unit 210 includes a testing switch and a load resistor, one end of the testing switch is connected to the low-voltage dc power signal through the load resistor, and the other end of the testing switch is grounded;
the leakage monitoring unit 220 includes a fluxgate monitoring interface and a leakage monitoring chip, and the leakage monitoring chip is configured to receive a leakage signal on the test switch through the fluxgate monitoring interface and send a trip control signal to the trip driving unit 140 through a signal output end;
the trip driving unit 140 is configured to control the trip unit 150 to trip according to the trip control signal.
In a specific embodiment, as shown in fig. 4, the leakage testing unit 210, the leakage monitoring unit 220, the trip driving unit 140, and the trip unit 150 are connected in sequence;
the leakage testing unit 210 and the leakage monitoring unit 220 are commonly used for monitoring whether a leakage fault phenomenon occurs in the dc load.
Specifically, as shown in fig. 5, the leakage test unit 210 includes a test switch S2 and a load resistor R3. The load resistor R3 is a to-be-tested resistor in the dc load, and if the dc load has an electric leakage phenomenon, when the test switch S2 is closed, a current signal is generated on a path of the electric leakage test unit 210.
The VCC in the leakage test unit 210 is a stable low-voltage dc signal, and the voltage of the low-voltage dc signal is not affected no matter how the front-end input voltage of the dc power supply unit changes, so as to ensure that the load resistor R3 does not change with the change of the front-end input voltage. The reliability of electric leakage detection is effectively improved.
As shown in fig. 3, the leakage monitoring unit 220 includes a composite leakage monitoring chip IC4 and a monitoring fluxgate coil J5, and the gate coil J5 includes an input line, an output line, and a test line, which is the leakage testing unit 210.
When the test switch S2 is closed, if a leakage phenomenon occurs in the dc load, the leakage monitoring chip IC4 may monitor a current signal through the fluxgate coil J5. After monitoring the current signal on the fluxgate coil J5, the leakage monitoring chip IC4 controls the signal at the TRIP point of the 8 th pin to be converted from the low level to the high level, thereby outputting a TRIP control signal to control the TRIP driving unit 140 and the TRIP unit 150 to perform the TRIP processing.
The composite electric leakage monitoring chip IC4 can be used for monitoring various electric leakage conditions, including smooth direct current residual current, pulsating direct current residual current, A type residual current, high-frequency sine residual current up to 1kHz and various composite residual currents, and the composite electric leakage monitoring chip IC4 accords with the GB/T22794 standard.
According to a specific implementation manner of the embodiment of the present application, the trip driving unit 140 includes a first thyristor and a second thyristor;
the anode of the first controlled silicon is connected with the reverse input end of the tripping unit 150, and the cathode of the first controlled silicon is respectively connected with the anode of the second controlled silicon and the power supply end of the leakage monitoring chip;
the cathode of the second silicon controlled rectifier is connected to the signal output terminal of the leakage monitoring chip and the signal output terminal of the control unit 130, respectively.
In an embodiment, as shown in fig. 3, the trip driving unit 140 is mainly composed of a first thyristor U4, a second thyristor U5 and a peripheral circuit.
Specifically, the first Silicon Controlled Rectifier U4 and the second Silicon Controlled Rectifier U5 are both unidirectional Silicon Controlled rectifiers (SCR for short).
The power end VCC of the electric leakage monitoring chip IC4 passes through the diode D1, the divider resistor R39 is connected with the control electrode of the first controllable silicon U4, and one end of the load resistor R39 is also connected with the cathode of the first controllable silicon through the divider resistor R37.
Specifically, the anode of the diode D1 is connected to a power driving signal of 6V, and the cathode of the diode is connected to the other end of the load resistor R39. The diode D1 is used to prevent voltage backflow.
The TRIP pin of the leakage monitoring chip IC4 is connected with the control electrode of the second controllable silicon U5 through a diode D4 and a divider resistor R40, and one end of the divider resistor is connected with the cathode of the second controllable silicon U5 through a resistor R38, a capacitor C38 and a capacitor C39 which are connected in parallel.
And the cathode of the second controllable silicon U5 is grounded.
The anode of the diode D4 is connected with the TRIP pin of the electric leakage monitoring chip IC4, and the cathode of the diode D4 is connected with the other end of the divider resistor R40. The diode D4 is used to prevent voltage backflow.
When a high level signal is sent to the control electrode of the second silicon controlled rectifier U5 at the TRIP position of the 8 th pin of the leakage monitoring chip IC4, the second silicon controlled rectifier U5 is conducted, and the current can flow from the anode to the cathode of the second silicon controlled rectifier.
The control electrode of the first controllable silicon U4 is changed from low voltage to high voltage along with the conduction of the second controllable silicon U5, so that the first controllable silicon U4 is also conducted according to the tripping control signal.
The trip unit 150 is composed of a trip coil J4 and necessary peripheral circuits, and when the first thyristor U4 and the second thyristor U5 of the trip driving unit 140 are both turned on according to the trip control signal, the trip coil J4 is powered on, so that the corresponding mechanical structure can be controlled to trip, the supply voltage of the dc load is cut off, and the leakage protection of the dc load is realized.
According to a specific implementation manner of the embodiment of the present application, the dc arc fault monitoring system further includes a dc power supply unit;
the direct current power supply unit comprises a direct current signal access module, an optical coupling feedback module, a transformer module and a voltage output module;
the direct current signal access module is used for accessing a high-voltage direct current signal, the input end of the transformer module is respectively connected with the direct current signal access module and the switch control end of the optocoupler feedback module, and the output end of the transformer module is connected with the input end of the voltage output module;
the testing end of the optocoupler feedback module is connected with the input end of the voltage output module;
the output end of the voltage output module is connected to the signal conditioning unit 120, the control unit 130 and the leakage monitoring unit 220, respectively.
In a specific embodiment, the dc power supply unit has a wide range of dc power supply input, and a 48V to 750V high-voltage dc electrical signal can be accessed through the dc signal access module.
Specifically, both ends of the dc signal access module are further connected in parallel with a voltage dependent resistor RV2 to realize overvoltage protection of the input end of the dc power supply unit.
And a corresponding filter sub-circuit can be arranged between the output end of the direct current signal access module and the transformer module so as to filter the high-voltage direct current electric signal accessed by the direct current signal access module, so that the primary coil of the transformer module can obtain a stable high-voltage electric signal.
The optical coupling feedback module comprises a power chip and an optical coupling feedback circuit, wherein a pulse width modulation controller and a power MOSFET are integrated in the power chip, and the power chip comprises a plurality of transfer switches SW. The power supply chip can be used for providing protection functions such as periodic overcurrent protection (external adjustable), overload protection, overvoltage protection, CS short-circuit protection, soft start protection and the like.
When the optocoupler feedback power supply detects that the voltage on the secondary coil of the transformer module is in an abnormal state, the power supply chip can cut off the transfer switches SW at all stages at any time so as to realize power supply fault protection processing.
The voltage output module of the direct-current power supply unit comprises a preset number of voltage adjusting chips, and the value of the preset number can be adaptively replaced according to the actual application scene.
The voltage output module comprises a preset number of voltage regulating chips. The number of the voltage adjusting chips can be set in a self-adaptive mode according to actual application scenes.
In this embodiment, the voltage regulation chip includes a first voltage regulation chip and a second voltage regulation chip, an input end of the first voltage regulation chip is connected to the secondary coil of the transformer module to receive the 6V voltage signal regulated by the transformer module, and an output end of the first voltage regulation chip outputs a 5V voltage signal.
The input end of the second voltage regulating chip is connected with the output end of the first voltage regulating chip so as to receive the 5V voltage signal regulated by the first voltage regulating chip, and the output end of the voltage regulating chip IC5 outputs a 3.3V voltage signal.
Specifically, the direct current power supply unit can step down to obtain three-level low-voltage electric signals such as 3.3V, 5V and 6V. The voltage signal at the output end of the dc power supply unit may be changed according to the number and specification of the voltage adjusting chips, which is not limited herein.
And the direct current power supply unit supplies power to each level of units and modules of the direct current arc fault monitoring system through each level of output ends of the voltage output module.
The embodiment of the application uses the weak point end of the direct current power supply unit as the power supply of the electric leakage test unit and the electric leakage monitoring unit, so that the power supply voltage in the electric leakage test unit is stable and is not influenced by the front-end wide-range input high-voltage electric signal.
As shown in fig. 6, according to a specific implementation manner of the embodiment of the present application, the system further includes an alarm unit 510, the alarm unit 510 is connected to the control unit 130, and the alarm unit 510 is configured to perform alarm processing according to a fault signal sent by the control unit 130.
In a specific embodiment, the alarm unit 510 may be implemented by an LED lamp, a buzzer, and a peripheral circuit thereof.
When a residual current or arc fault occurs, the states of the LED lamp and the buzzer change differently, and in the actual application process, a user may set a mode of performing alarm processing by the alarm unit 510 in the control unit 130 in advance, so as to determine the fault type of the circuit according to the alarm mode of the alarm unit 510.
According to the embodiment of the application, the alarm unit is arranged, so that the fault reason of the load circuit can be effectively analyzed after the fault processing is executed by the direct current arc fault monitoring system, and the recovery time of the circuit fault is further shortened.
As shown in fig. 6, according to a specific implementation manner of the embodiment of the present application, the system further includes a storage unit 410, the storage unit 410 is connected to the control unit 130, and the storage unit 410 is configured to store the event information sent by the control unit 130.
In a specific embodiment, the memory unit 410 may be implemented using a large-capacity EEPROM and its peripheral circuits.
The storage unit 410 is used for performing functions of recording occurrence of a residual current event, recording occurrence of an arc fault event, storing a backup program, and the like.
Specifically, the storage unit 410 may also use a FLASH chip or an SD chip to store the event information sent by the control unit 130. The present embodiment does not specifically limit the type of the storage unit 410, and may perform adaptive replacement according to the requirements of the actual application scenario.
As shown in fig. 6, according to a specific implementation manner of the embodiment of the present application, the system further includes a communication unit 310, the communication unit 310 is connected to the control unit 130, and the control unit 130 is configured to perform data communication through the communication unit 310.
In a specific embodiment, the communication unit 310 may be implemented by using an RS485 communication module and necessary peripheral circuits thereof, and the communication unit 310 is used for performing data interactive communication and online upgrade with other upper computer devices.
The user can perform data communication with the control unit 130 through the upper computer device to update the control program stored in the control unit 130.
Of course, the communication unit 310 may also be replaced with wireless communication modules such as 5G, 4G, wiFi, and RoLa, so as to effectively improve the communication safety and the communication distance.
The present embodiment does not specifically limit the type of the communication unit 310.
The embodiment of the application provides a direct current arc fault monitoring system, electric leakage phenomenon and direct current arc fault phenomenon that can stable monitoring direct current load appear to distinguish through electric leakage monitoring unit and the control unit to the voltage signal who monitors respectively and handle, send dropout control signal to dropout drive unit, with the control dropout unit break-brake that trips, thereby can effectively protect direct current load, avoid direct current load to appear burning out the condition of damaging because of electric leakage or direct current arc fault. In addition, the direct current arc fault monitoring system in the embodiment of the application is also internally provided with a local event recording function, an upper computer communication function and a multi-type alarm function, and can provide different types of responses after the residual current fault or the direct current arc fault occurs and the brake-separating processing is carried out, so that a user can carry out risk-avoiding processing and reason analysis on the fault in time.
In addition, this application embodiment still provides a circuit breaker equipment, circuit breaker equipment includes the direct current arc fault monitoring system in the aforementioned embodiment.
The breaker Device provided in this embodiment is a dc Arc Fault breaker (Arc Fault detection Device, AFDD for short) with leakage detection.
The embodiment of the application also provides the motor equipment, and the motor equipment comprises the circuit breaker equipment in the embodiment.
For specific implementation processes of the circuit breaker device and the motor device mentioned in the above embodiments, reference may be made to the specific implementation processes of the above method embodiments, and details are not described herein again.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention.
Claims (10)
1. A dc arc fault monitoring system, comprising:
the device comprises a current sampling unit, a signal regulating unit, a control unit, a tripping driving unit and a tripping unit which are connected in sequence;
the current sampling unit is connected with a direct current load, the output end of the current sampling unit is connected with the input end of the signal regulating unit, and the current sampling unit is used for converting a current signal in the direct current load into a direct current voltage signal and sending the direct current voltage signal to the signal regulating unit;
the signal regulating unit comprises a first amplifying circuit and a second amplifying circuit, the input end of the first amplifying circuit is used as the input end of the signal regulating unit and is connected with the current sampling unit, the output end of the first amplifying circuit is connected with the input end of the second amplifying circuit, and the output end of the second amplifying circuit is connected with the control unit;
the signal output end of the control unit is connected with the tripping driving unit, and the control unit is used for sending a tripping control signal to the tripping driving unit;
the tripping driving unit is used for controlling the tripping unit to trip according to the tripping control signal.
2. The direct current arc fault monitoring system of claim 1, further comprising: the leakage monitoring device comprises a leakage testing unit and a leakage monitoring unit;
the electric leakage testing unit comprises a testing switch and a load resistor, one end of the testing switch is connected with a low-voltage direct-current power supply signal through the load resistor, and the other end of the testing switch is grounded;
the leakage monitoring unit comprises a fluxgate monitoring interface and a leakage monitoring chip, and the leakage monitoring chip is used for receiving the leakage signal on the test switch through the fluxgate monitoring interface and sending a tripping control signal to the tripping driving unit through a signal output end of the leakage monitoring chip.
3. The dc arc fault monitoring system of claim 1, wherein the first amplification circuit is a differential amplification circuit or an instrument amplification circuit, and the second amplification circuit is a unidirectional input amplification circuit.
4. The direct current arc fault monitoring system of claim 2, wherein the trip driving unit comprises a first thyristor and a second thyristor;
the anode of the first controlled silicon is connected with the reverse input end of the tripping unit, and the cathode of the first controlled silicon is respectively connected with the anode of the second controlled silicon and the power supply end of the leakage monitoring chip;
and the cathode of the second controllable silicon is respectively connected with the signal output end of the electric leakage monitoring chip and the signal output end of the control unit.
5. The direct current arc fault monitoring system of claim 2, further comprising a direct current power supply unit;
the direct current power supply unit comprises a direct current signal access module, an optocoupler feedback module, a transformer module and a voltage output module;
the direct current signal access module is used for accessing a high-voltage direct current signal, the input end of the transformer module is respectively connected with the direct current signal access module and the switch control end of the optocoupler feedback module, and the output end of the transformer module is connected with the input end of the voltage output module;
the testing end of the optocoupler feedback module is connected with the input end of the voltage output module;
the output end of the voltage output module is respectively connected with the signal adjusting unit, the control unit and the electric leakage monitoring unit.
6. The direct current arc fault monitoring system according to claim 1, further comprising an alarm unit, wherein the alarm unit is connected to the control unit, and the alarm unit is configured to perform alarm processing according to a fault signal sent by the control unit.
7. The direct current arc fault monitoring system according to claim 1, further comprising a storage unit, wherein the storage unit is connected to the control unit, and the storage unit is used for storing the event information sent by the control unit.
8. The direct current arc fault monitoring system according to claim 1, further comprising a communication unit, wherein the communication unit is connected to the control unit, and the control unit is configured to perform data communication via the communication unit.
9. A circuit breaker apparatus, characterized in that the circuit breaker apparatus comprises a direct current arc fault monitoring system according to any one of claims 1-8.
10. An electrical machine arrangement, characterized in that it comprises a circuit breaker arrangement according to claim 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222051779.2U CN217956667U (en) | 2022-08-02 | 2022-08-02 | Direct current arc fault monitoring system, circuit breaker equipment and motor equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222051779.2U CN217956667U (en) | 2022-08-02 | 2022-08-02 | Direct current arc fault monitoring system, circuit breaker equipment and motor equipment |
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| CN217956667U true CN217956667U (en) | 2022-12-02 |
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| CN202222051779.2U Active CN217956667U (en) | 2022-08-02 | 2022-08-02 | Direct current arc fault monitoring system, circuit breaker equipment and motor equipment |
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| Country | Link |
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| CN (1) | CN217956667U (en) |
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