CN210835189U - Arc fault and electric leakage fault detection protection system and charging pile - Google Patents
Arc fault and electric leakage fault detection protection system and charging pile Download PDFInfo
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- CN210835189U CN210835189U CN201921225237.4U CN201921225237U CN210835189U CN 210835189 U CN210835189 U CN 210835189U CN 201921225237 U CN201921225237 U CN 201921225237U CN 210835189 U CN210835189 U CN 210835189U
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Abstract
The utility model provides an arc fault and electric leakage fault detection protection system and fill electric pile, wherein, protection system includes: the current detection module is used for collecting a current signal of the alternating current circuit to be detected; the residual current detection module is used for acquiring a residual current signal of the alternating current circuit to be detected; the protection module is arranged corresponding to the alternating current circuit to be tested; the control module is respectively connected with the current detection module, the residual current detection module and the protection module, and is used for judging whether the alternating current circuit to be detected has an arc fault or not according to the current signal and the residual current signal, judging whether the alternating current circuit to be detected has an electric leakage fault or not according to the residual current signal, and generating a circuit breaking instruction when the alternating current circuit to be detected has the arc fault or the electric leakage fault so as to control the protection module to cut off the alternating current circuit to be detected through the circuit breaking instruction. The utility model discloses can improve electrical equipment's security.
Description
Technical Field
The utility model relates to a fault detection technical field, concretely relates to arc fault and electric leakage fault detection protection system and one kind fill electric pile.
Background
At present, with the development of new energy technology, electric vehicles are also increasingly popularized, charging facilities serve as basic guarantees for the development of electric vehicles, and potential safety hazards of the charging facilities gradually become elbows for the development of electric vehicles.
Charging pile is as the facility that charges commonly used, often because its inside electrical insulation ageing damage directly causes serious hidden danger such as electric leakage, earth fault, electric arc fault and short circuit, leads to incident such as electric fire even. For avoiding above-mentioned problem, fill electric pile national standard and force the requirement at present and have ground connection detection, short-circuit protection and residual current protect function, nevertheless when filling electric pile internal line series arc fault or parallelly connected arc fault, general detection protect function hardly reliable detection electric arc fault and timely protects filling electric pile. Therefore, in order to detect arc faults and protect the charging pile in time, a fault arc detection protection system needs to be arranged inside the charging pile.
At present, the fault arc detection takes main line current as a judgment object, when an arc fault occurs, whether the fault arc current is an arc fault is judged by analyzing typical characteristics of the fault arc current, but the fault arc current characteristics are different due to different loads, so that the fault arc current characteristics are easy to be identified insufficiently, the problems of false alarm and leakage protection are caused, particularly, in the normal operation of a nonlinear electrical load, the current waveform can contain the characteristics of partial fault arc, and the fault arc current characteristics are judged erroneously. In order to solve the problem, usually, a large amount of characteristic data of fault arcs and a large amount of current characteristic data of normal operation of an electrical load are collected and stored, fault judgment is performed by comparing the collected fault arc current characteristics with characteristics in a database, or a self-learning mode is further adopted, and the fault arc or electrical load current characteristics are updated and memorized in real time, so that the fault arc judgment accuracy under different load conditions is improved.
In addition, whether an arc fault occurs in an electric circuit is detected by analyzing the characteristic value of the residual current, and similarly, various fault arc conditions are difficult to accurately detect by adopting the same device because the characteristic value of the arc fault is different due to different loads and because the characteristic values of the series fault arc, the parallel fault arc and the ground fault arc in the residual current are different.
In summary, the existing fault arc detection has the problems of low detection accuracy, easy occurrence of false alarm and false alarm, and difficulty in accurately detecting various fault arc conditions by adopting the same device.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem in the above-mentioned technique at least to a certain extent, for this reason, the utility model relates to an aim at provides an electric arc fault and electric leakage fault detection protection system, can improve the comprehensiveness and the electric arc fault detection's of detection accuracy to can in time protect the electrical equipment that electric arc fault or electric leakage fault appear, thereby can avoid because of electric arc fault or electric leakage fault cause's electric fire or electric shock accident, improve electrical equipment's security.
A second object of the present invention is to provide a charging pile.
In order to achieve the above object, an embodiment of the present invention provides an arc fault and leakage fault detection protection system, including: the current detection module is used for collecting a current signal of the alternating current circuit to be detected; the residual current detection module is used for acquiring a residual current signal of the alternating current circuit to be detected; the protection module is arranged corresponding to the alternating current circuit to be tested; the control module is respectively connected with the current detection module, the residual current detection module and the protection module, and is used for judging whether the alternating current circuit to be detected has an arc fault or not according to the current signal and the residual current signal, judging whether the alternating current circuit to be detected has an electric leakage fault or not according to the residual current signal, and generating a circuit breaking instruction when the alternating current circuit to be detected has the arc fault or the electric leakage fault, so that the protection module is controlled to cut off the alternating current circuit to be detected through the circuit breaking instruction.
According to the arc fault and leakage fault detection protection system provided by the embodiment of the utility model, the current signal of the AC circuit to be detected is collected through the current detection module, the residual current signal of the AC circuit to be detected is collected through the residual current detection module, whether the arc fault and the leakage fault occur is judged through the control module according to the collected current signal and the residual current signal, the circuit breaking instruction is generated when the arc fault and the leakage fault occur is judged, and the AC circuit to be detected, which has the arc fault or the leakage fault, is cut off through the protection module according to the circuit breaking instruction, the utility model can combine the arc fault detection and the leakage fault detection together, and simultaneously can use the residual current signal as the auxiliary criterion of the arc fault detection to avoid the false alarm and the false alarm caused by the fault arc current characteristic judgment, and can detect the arc fault or the leakage fault, the protection action is rapidly taken, so that the comprehensiveness of detection and the accuracy of arc fault detection can be improved, and the electric equipment with the arc fault or the electric leakage fault can be protected in time, so that the electric fire or the electric shock accident caused by the arc fault or the electric leakage fault can be avoided, and the safety of the electric equipment is improved.
In addition, according to the present invention, the arc fault and leakage fault detection protection system provided by the above embodiment may further have the following additional technical features:
further, the arc fault and leakage fault detection protection system further comprises: and the alarm module is connected with the control module, and the control module further generates an alarm instruction when judging that the alternating current circuit to be tested has an arc fault or an electric leakage fault so as to control the alarm module to give an alarm through the alarm instruction.
Further, the arc fault and leakage fault detection protection system further comprises: and the communication module is connected with the control module and is in communication connection with an upper computer, and the control module sends fault information to the upper computer through the communication module when judging that the alternating current circuit to be detected has an arc fault or an electric leakage fault.
According to the utility model discloses an embodiment, current detection module includes: the current transformer is arranged corresponding to a live wire or a zero line of the alternating current circuit to be detected; and the current acquisition circuit is respectively connected with the current transformer and the control module, acquires a current signal of the alternating current circuit to be detected through the current transformer and inputs the current signal into the control module after conversion processing.
According to the utility model discloses an embodiment, residual current detection module includes: the residual current transformer is arranged corresponding to a live wire and a zero line of the alternating current circuit to be detected; and the residual current acquisition circuit is respectively connected with the residual current transformer and the control module, and acquires a residual current signal of the alternating current circuit to be detected through the residual current transformer and inputs the residual current signal into the control module after conversion processing.
Further, the arc fault and leakage fault detection protection system further comprises: the self-checking module corresponds residual current transformer setting, and with control module links to each other, the self-checking module is used for according to the self-checking signal generation analog current that control module sent, residual current acquisition circuit passes through residual current transformer gathers analog current signal to input after the conversion processing control module, in order to realize residual current detection module's state self-checking.
According to the utility model discloses an embodiment, self-checking module includes: the self-checking coil is wound on the residual current transformer; and the self-checking circuit is respectively connected with the self-checking coil and the control module and is used for generating analog current flowing through the self-checking coil according to the self-checking signal.
According to the utility model discloses an embodiment, the protection module includes: the contactor is arranged in the alternating current circuit to be tested; and the switching signal output circuit is respectively connected with the contactor and the control module and is used for generating a switching control instruction according to the circuit breaking instruction and controlling the contactor to be disconnected through the switching control instruction so as to cut off the alternating current circuit to be tested.
Further, the arc fault and leakage fault detection protection system further comprises: and the power supply module is used for supplying power to the residual current detection module, the protection module, the control module and the alarm module.
In order to achieve the above objects, an embodiment of a second aspect of the present invention provides a charging pile, including an arc fault and a leakage fault detection protection system provided in an embodiment of a first aspect.
According to the utility model discloses a fill electric pile, including the electric arc fault and the electric leakage fault detection protection system that above-mentioned embodiment provided, the fault detection is more comprehensive, accurate, and the security is higher.
Drawings
Fig. 1 is a block diagram schematic diagram of an arc fault and leakage fault detection protection system according to an embodiment of the present invention;
fig. 2 is a block diagram schematic diagram of an arc fault and leakage fault detection protection system in accordance with an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an arc fault and leakage fault detection protection system according to an embodiment of the present invention;
fig. 4 is a pin diagram of a control chip according to an embodiment of the present invention;
fig. 5 is a circuit diagram of a current acquisition circuit according to an embodiment of the present invention;
fig. 6 is a circuit diagram of a residual current collecting circuit according to an embodiment of the present invention;
fig. 7 is a circuit diagram of a self-test circuit according to an embodiment of the present invention;
fig. 8 is a circuit diagram of a switching signal output circuit according to an embodiment of the present invention.
In the figure: 10-a current detection module, 20-a residual current detection module, 30-a protection module, 40-a control module, 50-an alarm module, 60-a communication module, 70-a self-detection module, 101-a current transformer, 102-a current acquisition circuit, 201-a residual current transformer, 202-a residual current acquisition circuit, 301-a contactor, 302-a switching signal output circuit and 701-a self-detection circuit.
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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Fig. 1 is a block diagram of an arc fault and leakage fault detection protection system according to an embodiment of the present invention.
As shown in fig. 1, the arc fault and leakage fault detection protection system according to the embodiment of the present invention includes a current detection module 10, a residual current detection module 20, a protection module 30, and a control module 40. Wherein, current detection module 10 is used for gathering the current signal of the alternating current circuit that awaits measuring, residual current detection module 20 is used for gathering the residual current signal of the alternating current circuit that awaits measuring, protection module 30 corresponds the alternating current circuit setting that awaits measuring, control module 40 respectively with current detection module 10, residual current detection module 20 links to each other with protection module 30, control module 40 is used for judging whether the alternating current circuit that awaits measuring takes place the arc fault according to current signal and residual current signal, and judge whether the alternating current circuit that awaits measuring takes place the electric leakage fault according to the residual current signal, and generate the instruction of opening a circuit when judging that the alternating current circuit that awaits measuring takes place the electric leakage fault or the electric leakage fault, in order to control protection module 30 through the instruction of.
Further, as shown in fig. 2, the utility model discloses arc fault and electric leakage fault detection protection system of embodiment still can include alarm module 50, and alarm module 50 links to each other with control module 40, and control module 40 still can generate alarm instruction when deciding that the alternating current circuit that awaits measuring takes place arc fault or electric leakage fault to send the warning through alarm instruction control alarm module 50.
In an embodiment of the present invention, as shown in fig. 3, the current detection module 10 includes a current transformer 101 and a current collection circuit 102. The current transformer 101 may be disposed corresponding to a zero line N of the ac circuit to be detected, specifically, the zero line of the ac circuit to be detected may pass through a primary winding of the current transformer 101, the current collecting circuit 102 is connected to the current transformer 101 and the control module 40, respectively, and the current collecting circuit 102 collects a current signal of the ac circuit to be detected through the current transformer 101 and inputs the current signal to the control module 40 after conversion processing.
In an embodiment of the present invention, as shown in fig. 3, the residual current detection module 20 includes a residual current transformer 201 and a residual current collection circuit 202. Wherein, residual current transformer 201 corresponds the live wire L and the zero line N setting of the alternating current circuit that awaits measuring, specifically, the live wire L and the zero line N of the alternating current circuit that awaits measuring can pass surplus residual current transformer 201's primary winding, and residual current collection circuit 202 links to each other with residual current transformer 201 and control module 40 respectively, and residual current collection circuit 202 gathers the residual current signal of the alternating current circuit that awaits measuring through residual current transformer 201 to input control module 40 after the conversion processing.
Further, as shown in fig. 2, the utility model discloses arc fault and leakage fault detection protection system of embodiment still can include self-checking module 70, self-checking module 70 corresponds residual current transformer 102 setting to link to each other with control module 40, self-checking module 70 can generate analog current according to the self-checking signal that control module 40 sent, residual current acquisition circuit 202 gathers analog current signal through residual current transformer 201, and input control module 40 behind the conversion processing, with the state self-checking that realizes residual current detection module.
In one embodiment of the present invention, as shown in fig. 3, self-test module 70 includes a self-test coil L2 and a self-test circuit 701. The self-checking coil L2 is wound around the residual current transformer 201, the self-checking circuit 701 is connected to the self-checking coil L2 and the control module 40, and the self-checking circuit 701 is configured to generate an analog current flowing through the self-checking coil L2 according to a self-checking signal.
In one embodiment of the present invention, as shown in fig. 3, the protection module 30 includes a contactor 301 and a switching signal output circuit 302. The contactor 301 comprises KM1 and KM2, the KM1 and the KM2 are respectively and correspondingly arranged in a live line L and a zero line N of the circuit to be tested, the switch signal output circuit 302 is respectively connected with the contactor 301 and the control module 40, the switch signal output circuit 302 can generate a switch control instruction according to the breaking instruction, and the contactor 301 is controlled to be disconnected through the switch control instruction so as to cut off the alternating current circuit to be tested.
Further, as shown in fig. 2, the utility model discloses arc fault and electric leakage fault detection protection system of embodiment still can include communication module 60, and communication module 60 links to each other with control module 40 to carry out the communication with the host computer and be connected, control module 40 accessible communication module 60 sends fault information to the host computer when judging that the alternating current circuit that awaits measuring takes place arc fault or electric leakage fault.
Further, as shown in fig. 2, the arc fault and leakage fault detection protection system according to the embodiment of the present invention may further include a power module, and the power module is used for supplying power to the residual current detection module 20, the protection module 30, the control module 40, the alarm module 50, and the like. Specifically, the power module may convert an ac power source or an external dc power source into a low voltage dc power source for output, so as to supply power to the modules.
In one embodiment of the present invention, the control module 40 includes a control chip ATSAMC21E18A shown in FIG. 4. The OSC32_ IN and OSC32_ OUT pins of the control chip atm ac 21E18A are grounded, and the control chip atm ac 21E18A is connected to a voltage of 3.3V through the VDD pin and to the reset circuit through the NRST pin.
In a specific embodiment of the present invention, the current collecting circuit 102 includes the circuit shown in fig. 5. The port 1 of the current transformer is connected with the anode of the diode D41, the cathode of the diode D42, one end of the resistor R41 and one end of the resistor R43 respectively, the other end of the resistor R43 is connected with one end of the capacitor C42, the other end of the capacitor C42 is grounded, the port 2 of the current transformer is connected with the cathode of the diode D41, the anode of the diode D42, the other end of the resistor R41 and one end of the resistor R42 respectively, the other end of the resistor R42 is connected with one end of the capacitor C41, and the other end of the capacitor C41 is connected with the other end of the capacitor C42 and grounded. Referring to fig. 3, 4 and 5, the current collecting circuit 102 may perform resistance sampling conversion processing on the current signal input by the current transformer 101 to generate a voltage signal I1N \ I1P, and the voltage signal I1N \ I1P is input to a sampling port of the control chip ATSAMC21E18A through pins PA2 and PA 3.
In a specific embodiment of the present invention, the residual current collecting circuit 202 includes a circuit shown in fig. 6, including a residual current collecting unit, a filtering unit and a differential amplifying unit. One end of a measuring coil L1 in the circuit for collecting the residual current is connected with one end of a resistor R21, and is connected with one end of a resistor R22 of a filter circuit through a connecting line between one end of a measuring coil L1 and one end of the resistor R21, and the filter circuit is connected with one end of a resistor R2A in the differential amplification circuit through an LPB end of an LTC 1563-2. Referring to fig. 3, 4 and 6, the residual current collecting circuit 202 may perform resistance sampling and reference voltage source conversion on a residual current signal collected by the residual current transformer 201 through the measuring coil L1 to generate a sampled voltage signal V2, and then process the sampled voltage signal V2 through the filter circuit and the differential amplifier circuit to generate a current signal IA, where the sampled voltage signal V2 and the current signal IA may be respectively input to a sampling port of the control chip ATSAMC21E18A through corresponding PA6 pin PA7 pins.
In a specific embodiment of the present invention, the self-test circuit 701 includes the circuit shown in fig. 7. The base of a triode Q3 in the self-checking circuit 701 is connected with one end of a resistor R32, the collector of the triode Q3 is connected with one end of a self-checking coil L2, the other end of the self-checking coil L2 is connected with one end of a resistor R31, the other end of the resistor R31 is connected with a 2.5v power supply, the emitter of the triode Q3 is connected with one end of a resistor R33, and the other end of the resistor R33 is grounded. Referring to fig. 3, 4 and 7, the self-test circuit 701 may generate an analog current flowing through the self-test coil L2 according to a self-test signal V1, i.e. a high-level signal, output by the pin PA8 of the control chip ATSAMC21E18A, and the residual current collecting circuit 202 collects the analog current signal through the residual current transformer 201 and inputs the analog current signal to the control module 40 after conversion processing, so as to implement the state self-test of the residual current detection module, where the analog current is a rated value of the residual current, and may be 30mA specifically. Whether the residual current detection module normally works and the accuracy of the detection current action value can be verified through the self-checking module, the stability of the system can be guaranteed, and the accuracy of the system is improved.
In one embodiment of the present invention, the switching signal output circuit 302 includes the circuit shown in fig. 8. The port a of the U5 in the switching signal output circuit 302 is connected to one end of a resistor R51, the port Y is connected to one end of a resistor R52 and one end of a resistor R54 of the signal amplification circuit, the other end of the resistor R52 is connected to the base of a transistor Q6 and one end of a resistor R53, the other end of the resistor R53 is grounded to the emitter of the transistor Q6, the other end of the resistor R54 is connected to the base of the transistor Q7 and one end of a resistor R55, and the other end of the resistor R55 is grounded to the emitter of the transistor Q7. Referring to fig. 3, 4 and 8, the switching signal output circuit 302 may generate the switching control commands RLY 1-RLY 2-according to the disconnection command RLY _ CTRL output by the control chip ATSAMC21E18A through a PB6 pin, specifically, the disconnection command RLY _ CTRL output by the control chip ATSAMC21E18A through a PB6 pin may be input into a U5 through a port a, a high level signal is output through a port Y of a U5, the Q6 and the Q7 are controlled to be turned on, and the switching control commands RLY 1-RLY 2-that is, contactor driving currents are output to the contactors KM1\ KM2 to be turned off corresponding to the control contactors KM1\ KM2, respectively, so as to cut off the live line L and the neutral line N of the ac circuit to be tested.
In one embodiment of the present invention, the alarm module 50 includes a speaker and an alarm lamp. Referring to fig. 3 and 4, the alarm module 50 may control the horn to sound and the alarm lamp to flash according to the alarm command BUZZ \ LED, i.e. the corresponding level signal, output by the control chip ATSAMC21E18A through the PB6 pin and the PB5 pin.
In an embodiment of the present invention, the communication module 60 may include a communication device based on RS485 communication, RS232 communication or CAN bus communication. Referring to fig. 3 and 4, the communication module 60 may receive the fault information output by the control chip ATSAMC21E18A through a pin PA10 and upload the received fault information to an upper computer according to a communication protocol, and the communication module 60 may further input feedback information to the control chip ATSAMC21E18A through a pin PA11 of the control chip ATSAMC21E 18A.
Based on the structure, the utility model discloses arc fault and electric leakage fault detection protection system can realize the collection function of self-checking function, arc fault's detection protect function, electric leakage fault's detection protect function and fault information.
Referring to fig. 3, fig. 4 and fig. 7, the utility model discloses the self-checking function that arc fault and electric leakage fault detection protection system realized, the self-checking signal V1 is exported to the PA8 pin of specific accessible control chip ATSAMC21E18A, high level signal is with control self-checking coil L2 circular telegram promptly, generate the analog current Itest that flows through self-checking coil L2, gather analog current Itest through residual current transformer 201, and input it to residual current acquisition circuit 202 and carry out the conversion processing, produce current signal IA, and input current signal IA into control chip ATSAMC21E18A through PA7 pin, wherein, analog current Itest can be the rated value 30mA of residual current specifically, judge whether electric leakage fault detection function is normal with this, detect whether the current precision satisfies the requirement.
Referring to fig. 3, 4, 6 and 8, the leakage fault detection protection function implemented by the arc fault and leakage fault detection protection system according to the embodiment of the present invention may specifically collect a residual current signal through the residual current transformer 201, and input the residual current signal into the residual current collecting circuit 202 for conversion processing to generate the current signal IA, if a leakage fault occurs, the current signal IA may be assumed to be an a signal, if no leakage fault occurs, the current signal IA may be assumed to be a b signal, if the signal a is input into the control chip ATSAMC21E18A through the PA7 pin, the control chip ATSAMC21E18A may output the open circuit command RLY _ CTRL through the PB6 pin, the open circuit command RLY _ is input into the U5 through the port a, generate a high level signal, output through the port Y of the U5, control Q6 and Q7 to be turned on, and output the switch control command RLY- "1-, Y2-, Y — 1, and KM2 through the port a. The contactor driving current is switched off corresponding to the control contactor KM1\ KM2 respectively, the live line L and the zero line N of the alternating current circuit to be detected are cut off, the alarm instruction BUZZ \ LED output through a PB6 pin and a PB5 pin is used, namely, the high-level signal controls the sound-light alarm module 50 to perform sound-light alarm, fault information is output through a PA10 pin, and the fault information is sent to the upper computer through the communication module 60.
Referring to fig. 3, 4, 5 and 8, the arc fault detection protection of the arc fault and leakage fault detection protection system according to the embodiment of the present invention may specifically collect a current signal through the current transformer 101, the voltage signal is input into the current acquisition circuit 102 for conversion processing, the generated voltage signal I1N \ I1P is input into a control chip ATSAMC21E18A for analysis and judgment, if the control chip ATSAMC21E18A generates an arc fault signal according to the input voltage signal I1N \ I1P, at the same time, the control chip ATSAMC21E18A also generates an arc fault signal according to the input current signal IA, the disconnection control of the circuit contactor 301 under test can be performed by the control chip atamc 21E18A outputting the disconnection command RLY _ CTRL, and the alarm instruction BUZZ \ LED output by a PB6 pin and a PB5 pin controls the acousto-optic alarm module 50 to carry out acousto-optic alarm, meanwhile, fault information is output through a pin PA10 and is sent to an upper computer through the communication module 60; if the control chip ATSAMC21E18A does not generate an arc fault signal according to the input current signal IA, the control chip ATSAMC21E18A can control the audible and visual alarm module 50 to perform audible and visual alarm through the alarm instruction BUZZ \ LED output by the PB6 pin and the PB5 pin.
In the above embodiment, the reason why whether the arc characteristic exists in the residual current is further detected is that, when the electric vehicle load shown in fig. 3 normally works, the residual current signal is a stable signal with an approximate zero amplitude, when an arc fault occurs, the current inlet and outlet are unbalanced due to special characteristics such as asymmetry of positive and negative half-cycle waveforms of the fault arc current or difference of adjacent cycle waveforms, a series of pulse waves may appear in the residual current, particularly in a nonlinear load, the arc current distortion is more serious, the difference of adjacent cycle current waveforms is larger, the pulse phenomenon in the residual current is more obvious, and the duration time of the severity of the arc fault in the electrical circuit can be qualitatively determined by detecting the number of the pulse waves appearing in the residual current within a certain time. The residual current signals collected by the residual current detection module are used as an auxiliary criterion for arc fault judgment, and particularly, whether a series of pulse waves exist in the residual current is analyzed through the control module, so that the arc fault judgment is carried out, and the accuracy of arc fault detection can be improved.
Referring to fig. 3 and 4, the embodiment of the present invention provides a collection of fault information of arc fault and leakage fault detection protection system, specifically, the PA10 pin of the control chip ATSAMC21E18A outputs the fault information to the communication module 60, and the communication module 60 sends the received fault information to the upper computer according to the communication protocol.
According to the arc fault and leakage fault detection protection system provided by the embodiment of the utility model, the current signal of the AC circuit to be detected is collected through the current detection module, the residual current signal of the AC circuit to be detected is collected through the residual current detection module, whether the arc fault and the leakage fault occur is judged through the control module according to the collected current signal and the residual current signal, the circuit breaking instruction is generated when the arc fault and the leakage fault occur is judged, and the AC circuit to be detected, which has the arc fault or the leakage fault, is cut off through the protection module according to the circuit breaking instruction, the utility model can combine the arc fault detection and the leakage fault detection together, and simultaneously can use the residual current signal as the auxiliary criterion of the arc fault detection to avoid the false alarm and the false alarm caused by the fault arc current characteristic judgment, and can detect the arc fault or the leakage fault, the protection action is rapidly taken, so that the comprehensiveness of detection and the accuracy of arc fault detection can be improved, and the electric equipment with the arc fault or the electric leakage fault can be protected in time, so that the electric fire or the electric shock accident caused by the arc fault or the electric leakage fault can be avoided, and the safety of the electric equipment is improved.
Corresponding to the above embodiment, the utility model also provides a fill electric pile.
The embodiment of the utility model provides a fill electric pile, including the arc fault and the electric leakage fault detection protection system that above-mentioned embodiment provided, its embodiment mode refers to above-mentioned embodiment.
According to the embodiment of the utility model provides a fill electric pile, including the electric arc fault and the electric leakage fault detection protection system that above-mentioned embodiment provided, the fault detection is more comprehensive, accurate, and the security is higher.
In the present invention, unless otherwise expressly stated or limited, the terms "connected" and "connected" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. An arc fault and leakage fault detection protection system, comprising:
the current detection module is used for collecting a current signal of the alternating current circuit to be detected;
the residual current detection module is used for acquiring a residual current signal of the alternating current circuit to be detected;
the protection module is arranged corresponding to the alternating current circuit to be tested;
the control module is respectively connected with the current detection module, the residual current detection module and the protection module, and is used for judging whether the alternating current circuit to be detected has an arc fault or not according to the current signal and the residual current signal, judging whether the alternating current circuit to be detected has an electric leakage fault or not according to the residual current signal, and generating a circuit breaking instruction when the alternating current circuit to be detected has the arc fault or the electric leakage fault, so that the protection module is controlled to cut off the alternating current circuit to be detected through the circuit breaking instruction.
2. The arc fault and leakage fault detection protection system of claim 1, further comprising:
and the alarm module is connected with the control module, and the control module further generates an alarm instruction when judging that the alternating current circuit to be tested has an arc fault or an electric leakage fault so as to control the alarm module to give an alarm through the alarm instruction.
3. The arc fault and leakage fault detection protection system of claim 2, further comprising:
and the communication module is connected with the control module and is in communication connection with an upper computer, and the control module sends fault information to the upper computer through the communication module when judging that the alternating current circuit to be detected has an arc fault or an electric leakage fault.
4. The arc fault and leakage fault detection protection system according to any one of claims 1-3, wherein said current detection module comprises:
the current transformer is arranged corresponding to a live wire or a zero line of the alternating current circuit to be detected;
and the current acquisition circuit is respectively connected with the current transformer and the control module, acquires a current signal of the alternating current circuit to be detected through the current transformer and inputs the current signal into the control module after conversion processing.
5. The arc fault and leakage fault detection protection system according to any one of claims 1-3, wherein the residual current detection module comprises:
the residual current transformer is arranged corresponding to a live wire and a zero line of the alternating current circuit to be detected;
and the residual current acquisition circuit is respectively connected with the residual current transformer and the control module, and acquires a residual current signal of the alternating current circuit to be detected through the residual current transformer and inputs the residual current signal into the control module after conversion processing.
6. The arc fault and leakage fault detection protection system of claim 5, further comprising:
the self-checking module corresponds residual current transformer setting, and with control module links to each other, the self-checking module is used for according to the self-checking signal generation analog current that control module sent, residual current acquisition circuit passes through residual current transformer gathers analog current signal to input after the conversion processing control module, in order to realize residual current detection module's state self-checking.
7. The arc fault and leakage fault detection protection system of claim 6, wherein said self-test module comprises:
the self-checking coil is wound on the residual current transformer;
and the self-checking circuit is respectively connected with the self-checking coil and the control module and is used for generating analog current flowing through the self-checking coil according to the self-checking signal.
8. The arc fault and leakage fault detection protection system according to any one of claims 1-3, wherein said protection module comprises:
the contactor is arranged in the alternating current circuit to be tested;
and the switching signal output circuit is respectively connected with the contactor and the control module and is used for generating a switching control instruction according to the circuit breaking instruction and controlling the contactor to be disconnected through the switching control instruction so as to cut off the alternating current circuit to be tested.
9. The arc fault and leakage fault detection protection system of claim 3, further comprising:
and the power supply module is used for supplying power to the residual current detection module, the protection module, the control module and the alarm module.
10. A charging pile comprising an arc fault and earth leakage fault detection protection system according to any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921225237.4U CN210835189U (en) | 2019-07-31 | 2019-07-31 | Arc fault and electric leakage fault detection protection system and charging pile |
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| CN201921225237.4U CN210835189U (en) | 2019-07-31 | 2019-07-31 | Arc fault and electric leakage fault detection protection system and charging pile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865013A (en) * | 2020-03-30 | 2021-05-28 | 深圳友讯达科技股份有限公司 | Protection device based on residual current characteristic analysis |
| CN112865012A (en) * | 2021-03-01 | 2021-05-28 | 合肥依科普工业设备有限公司 | Electric arc fire protection system |
-
2019
- 2019-07-31 CN CN201921225237.4U patent/CN210835189U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865013A (en) * | 2020-03-30 | 2021-05-28 | 深圳友讯达科技股份有限公司 | Protection device based on residual current characteristic analysis |
| CN112865013B (en) * | 2020-03-30 | 2023-05-26 | 深圳友讯达科技股份有限公司 | Protection device based on residual current characteristic analysis |
| CN112865012A (en) * | 2021-03-01 | 2021-05-28 | 合肥依科普工业设备有限公司 | Electric arc fire protection system |
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Address after: Room 354, No. 18, Xinya Road, Wujin high tech Industrial Development Zone, Changzhou City, Jiangsu Province Patentee after: Guochuang mobile energy innovation center (Jiangsu) Co.,Ltd. Address before: Room 354, No. 18, Xinya Road, Wujin high tech Industrial Development Zone, Changzhou City, Jiangsu Province Patentee before: National innovation energy automobile intelligent energy equipment innovation center (Jiangsu) Co.,Ltd. |