CN111289852B - Arc detection device and method - Google Patents
Arc detection device and method Download PDFInfo
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- CN111289852B CN111289852B CN202010112767.9A CN202010112767A CN111289852B CN 111289852 B CN111289852 B CN 111289852B CN 202010112767 A CN202010112767 A CN 202010112767A CN 111289852 B CN111289852 B CN 111289852B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention relates to an arc detection device and method. The arc detection device is applied to a direct-current power distribution system with a direct-current power supply and comprises a controller, a current sensor and a spectrum analyzer. When the arc detection device works, the controller controls the direct-current power supply to output ripple current; the current sensor acquires a current detection signal and transmits the current detection signal to the spectrum analyzer; the spectrum analyzer may extract the ripple signal from the current sense signal and communicate to the controller. When an arc fault occurs in the direct current distribution system, the arc fault can cause the change of the ripple signal, and the controller can obtain whether the arc fault of the direct current distribution system exists or not by monitoring whether the ripple signal changes or not. This arc detection device detects direct current distribution system's electric arc through electricity structure, receives environmental impact less, and the testing result is more accurate.
Description
Technical Field
The invention relates to the technical field of electrical engineering, in particular to an electric arc detection device and method.
Background
The electric arc that direct current distribution system produced is difficult for extinguishing, causes incident such as conflagration, explosion easily, has great potential safety hazard.
Conventionally, it is generally detected whether an arc is generated in a dc power distribution system by using non-electrical quantities such as sound and light.
The inventor finds out in the process of realizing the conventional technology that: the electric arc is greatly influenced by the environment through technologies such as sound, light and the like, and the detection result is not accurate enough.
Disclosure of Invention
Therefore, it is necessary to provide an arc detection apparatus and method for solving the problem that the arc detection of the dc power distribution system in the conventional technology is greatly affected by the environment.
An arc detection device for use in a dc power distribution system having a dc power source, the arc detection device comprising:
the controller is connected with the direct current power supply to control the direct current power supply to output ripple current;
the current sensor is arranged on a direct current bus of the direct current power supply to detect the magnitude of the output current of the direct current power supply and generate a current detection signal;
the spectrum analyzer is connected with the current sensor to acquire the current detection signal and extract a ripple signal of the ripple current from the current detection signal; the spectrum analyzer is further connected with the controller, so that the controller can acquire the ripple signal and judge whether the arc fault occurs in the direct current power distribution system according to the ripple signal.
In one embodiment, the dc power supply has a switching converter;
the controller is connected with the switch converter so as to enable the direct-current power supply to output ripple current by controlling the switch converter.
In one embodiment, the arc detection apparatus further includes:
and the communicator is connected with the controller so as to output fault information to the communicator when the controller judges that the arc fault occurs in the direct current power distribution system.
The arc detection device is applied to a direct-current power distribution system with a direct-current power supply and comprises a controller, a current sensor and a spectrum analyzer. When the arc detection device works, the controller controls the direct-current power supply to output ripple current; the current sensor acquires a current detection signal and transmits the current detection signal to the spectrum analyzer; the spectrum analyzer may extract the ripple signal from the current sense signal and communicate to the controller. When an arc fault occurs in the direct current distribution system, the arc fault can cause the change of the ripple signal, and the controller can obtain whether the arc fault of the direct current distribution system exists or not by monitoring whether the ripple signal changes or not. This arc detection device detects direct current distribution system's electric arc through electricity structure, receives environmental impact less, and the testing result is more accurate.
An arc detection method based on the arc detection device according to any one of the above embodiments, the arc detection method comprising:
controlling the direct current power supply to output ripple current;
detecting the magnitude of the output current of the direct current power supply and generating a current detection signal;
extracting a ripple signal of the ripple current according to the current detection signal;
and judging whether the direct current distribution system has an arc fault or not according to the ripple signal.
In one embodiment, the controlling the output ripple current of the dc power supply includes:
and periodically disturbing a switching converter of the direct current power supply to periodically change the working frequency of the switching converter, wherein the direct current power supply outputs ripple current.
In one embodiment, the extracting a ripple signal of the ripple current according to the current detection signal includes:
and extracting a ripple signal of the ripple current according to the amplitude variation of the current.
In one embodiment, the determining whether an arc fault occurs in the dc power distribution system according to the ripple signal includes:
acquiring the ripple signal, and comparing the amplitude of the ripple signal with a first preset value;
and if the amplitude of the ripple signal is smaller than the first preset value, the arc fault occurs in the direct current power distribution system.
In one embodiment, after determining whether an arc fault occurs in the dc power distribution system according to the ripple signal, the method further includes:
and if the direct current power distribution system has an arc fault, controlling the switch converter to stop working and outputting fault information.
In one embodiment, before controlling the dc power supply U1 to output the ripple current, the method further includes:
presetting the number of the direct current power supply U1;
the outputting the fault information includes:
and acquiring the number of the direct current power supply U1, and outputting fault information comprising the number of the direct current power supply U1.
In one embodiment, the detecting the magnitude of the output current of the dc power supply and generating the current detection signal includes:
and detecting the magnitude of the output current of the direct current power supply through a Hall current sensor, and generating a current detection signal.
The arc detection method is applied to a direct current power distribution system with a direct current power supply, and comprises the steps of controlling the direct current power supply to output ripple current; detecting the current magnitude to generate a current detection signal; the ripple signal is extracted from the current sense signal. When an arc fault occurs in the direct current distribution system, the arc fault can cause the change of the ripple signal, so that whether the arc fault of the direct current distribution system exists or not can be obtained by monitoring whether the ripple signal changes or not. According to the arc detection method, the electric arc of the direct current power distribution system is detected through the electric structure, the influence of the environment is small, and the detection result is more accurate.
Drawings
FIG. 1 is a schematic diagram of an embodiment of an arc detection device coupled to a DC power distribution system;
FIG. 2 is a schematic diagram of the connection of an arc detection device to a DC power distribution system in accordance with another embodiment of the present application;
FIG. 3 is a schematic diagram of the connection of an arc detection device to a DC power distribution system in accordance with yet another embodiment of the present application;
FIG. 4 is a schematic diagram of the connection of an arc detection device to a DC power distribution system in accordance with yet another embodiment of the present application;
FIG. 5 is a schematic flow chart of a method of arc detection according to an embodiment of the present application;
FIG. 6 is a flowchart illustrating the detailed process of step S400 of the arc detection method according to an embodiment of the present application;
FIG. 7 is a schematic flow chart of a method of arc detection according to another embodiment of the present application;
FIG. 8 is a schematic flow chart of an arc detection method according to yet another embodiment of the present application.
Wherein, the meanings represented by the reference numerals of the figures are respectively as follows:
10. an arc detection device;
110. a controller;
120. a current sensor;
130. a spectrum analyzer;
140. a communicator;
310. a switching converter;
20. an arc fault location.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be considered as limiting the present application.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
The electric arc generated in the direct current distribution system has no zero crossing point, and is more difficult to extinguish than the electric arc generated in the alternating current distribution system, so that safety accidents such as fire, explosion and the like are easily caused, and the safety hazard is great. The direct current arc can be divided into a series arc and a parallel arc according to the occurrence position. Because the arc can be regarded as a nonlinear resistor, when series arc occurs in a direct current distribution system, the impedance of a system loop is increased, and at the moment, the traditional overcurrent protection circuit cannot play a protection role.
Based on the above problems, the present application provides an arc detection device and an arc detection method based on the arc detection device, so as to realize arc detection in a dc power distribution system through electrical measurement. In the present application, the connection between two electronic devices refers to an electrical connection, where the electrical connection refers to a connection through a wire or a radio, so that the two electronic devices can transmit electrical signals.
The arc detection device 10 of the present application is applied to a dc power distribution system having a dc power supply U1. In the embodiment shown in fig. 1 to 4, U1 represents the dc power supply, and the capacitor C1 is an equivalent capacitor of the dc power supply U1. N1 represents the load of the dc distribution system and the capacitor C2 represents the equivalent capacitance of the load N1. Resistor R1 and inductor L1 represent the line impedance of the dc bus of the dc power distribution system. Meanwhile, we refer to a case where an arc is generated in a circuit of a direct current distribution system as an arc fault. As shown in fig. 1, the arc detection apparatus 10 may include a controller 110, a current sensor 120, and a spectrum analyzer 130.
Specifically, the controller 110 may be connected to the dc power source U1 in the dc power distribution system, so as to control the dc power source U1 to output the ripple current when the dc power distribution system is in operation. The ripple current is a current waveform caused by voltage fluctuation of the dc voltage-stabilized power supply. The waveform of the ripple current is generally a harmonic wave having a frequency higher than the power frequency, like a sine wave, or a pulse wave having a narrow width, which is common knowledge in the art and will not be described again. In the present embodiment, the controller 110 is connected to the dc power source U1 in the dc power distribution system, so as to disturb the output of the dc power source U1, and make the dc power source U1 output ripple current.
The current sensor 120 is disposed on the dc bus of the dc power supply U1 to detect the magnitude of the output current of the dc power supply U1 and generate a current detection signal. In other words, the current sensor 120 is used in series with the load N1 of the dc distribution system to detect the magnitude of the output current of the dc power source U1. For convenience of description, the value of the output current of the dc power supply U1 detected by the current sensor 120 is referred to as a current detection signal. The current sensor 120 here may be a high frequency hall current sensor. A magneto-electric conversion device made of semiconductor materials is based on a magnetic balance Hall principle and a Hall effect and can measure milliampere-level micro current. Therefore, the hall current sensor can be used in the present embodiment to accurately detect the magnitude of the output current of the dc power supply U1.
The spectrum analyzer 130 is connected to the current sensor 120 to acquire the current detection signal and extract a ripple signal of the ripple current from the current detection signal. Generally, even without the control of the controller 110, the dc power output by the dc power supply U1 will have voltage fluctuations, i.e. when the arc detection device 10 of the present application is not operated, the dc power output by the dc power supply U1 will also have ripple signals. In the embodiments of the present application, for the sake of distinction, we will refer to only the voltage fluctuation generated by the controller 110 as a ripple signal; the voltage fluctuations not effected by the controller 110 are referred to as noise signals. In the present embodiment, the spectrum analyzer 130 may acquire a current detection signal and extract a ripple signal of a ripple current generated by the action of the controller 110 from the detection signal. The spectrum analyzer 130 is also connected to the controller 110 to transfer the ripple signal to the controller 110 after the ripple signal is extracted by the spectrum analyzer 130. At this time, the controller 110 may determine whether an arc fault occurs in the dc distribution system according to the ripple signal.
More specifically, when the arc detection device 10 of the present application is in operation, the controller 110 controls the dc power supply U1 to output a ripple current; while the current sensor 120 acquires a current sense signal and passes it to the spectrum analyzer 130. At this time, the spectrum analyzer 130 may extract a ripple signal of the ripple current generated by the action of the controller 110 from the current detection signal and transfer the ripple signal to the controller 110. As is known from the above description, an arc in a circuit can be seen as a non-linear resistance that can cause a change in the line impedance. Therefore, when an arc fault occurs in the dc power distribution system, the arc fault may cause a variation in the ripple signal, and particularly the arc may reduce the amplitude of the ripple signal. Therefore, the controller 110 can obtain whether the arc fault of the dc power distribution system occurs or not by monitoring whether the ripple signal changes or not. Meanwhile, the spectrum analyzer 130 may remove a noise signal that is not caused by the action of the controller 110, thereby accurately extracting a ripple signal. According to the arc detection device 10, the electric arc of the direct-current power distribution system is detected through the electric structure, the influence of the environment is small, and the detection result is more accurate.
Further, the controller 110 may control the ripple current generated by the dc power supply U1 to be a periodically varying current. Therefore, when the spectrum analyzer 130 extracts the ripple electric signal, the ripple signal can be extracted only by extracting the electric signal with periodically changing period, so that the accuracy of the spectrum analyzer 130 in improving the ripple signal is improved.
Further, in the arc detection device 10 of the present application, the controller 110 may comprehensively analyze the amplitude variation characteristics of the ripple signal under the action of the controller 110, so as to improve the detection accuracy.
Further, in the arc detection apparatus 10 of the present application, when the controller 110 determines that the arc fault of the dc power distribution system occurs, the dc power supply U1 may also be controlled to stop outputting the dc power, so as to protect the dc power distribution system.
In one embodiment, the arc detection apparatus 10 of the present application, the dc power distribution system to which it is applied, may have a plurality of dc power sources U1. The different DC power supplies U1 may have different numbers, such as DC power supply U1-01, DC power supply U1-02, and DC power supply U1-03, respectively. In this case, each dc power source U1 may be provided with an arc detection device 10 for arc detection, and the controller 110 of the arc detection device 10 may be preset with the serial number of the dc power source U1. In this manner, when the controller 110 determines that a dc power distribution system arc fault has been identified, fault information including the number of the dc power source U1 may be output. For example, the controller 110 may output a DC power supply U1-02 arc fault. The arc detection device 10 can output fault information including the number of the direct current power supply U1, so that staff can quickly repair the arc fault conveniently.
In one embodiment, as shown in FIG. 2, the DC power supply U1 has a switching converter 310. The controller 110 is connected to the switching converter 310 to control the switching converter 310 to enable the dc power source U1 to output a ripple current.
Specifically, switching converter 310 refers to a circuit that uses semiconductor power devices as switches to convert one form of power to another. The power supply form here can be direct current or alternating current. For example, the dc power may be converted into the ac power by the switching converter 310, or the ac power may be converted into the dc power by the switching converter 310. In the embodiment shown in fig. 2, the dc power is converted to dc power by a switching converter 310. The switching converter 310 in the dc power supply U1 generally operates at a fixed switching frequency when not being operated by the arc detection apparatus 10 of the present application. This is a routine skill in the art and will not be described further.
In this embodiment, the controller 110 may be connected to the switching converter 310 in the dc power supply U1, so that the operating frequency of the switching converter 310 is periodically changed back and forth within a certain range by adjusting the operating frequency of the switching converter 310, and the casing causes the dc power supply U1 to output ripple current. For example, the switching converter 310 in the DC power supply U1 may operate at a fixed switching frequency of 10KHz when not being subjected to the arc detection apparatus 10 of the present application. In the present application, the controller 110 is connected to the switching converter 310, so that the switching frequency of the switching converter 310 can be periodically varied between 9.9KHz and 10.1 KHz. Thus, the dc power supply U1 can output ripple current.
In the arc detection device 10, the controller 110 controls the switching converter 310 to periodically reciprocate within a certain range, so that the dc power supply U1 outputs a ripple current. Therefore, when the spectrum analyzer 130 extracts the ripple electric signal, the ripple signal can be extracted only by extracting the electric signal with periodically changing period, so that the accuracy of the spectrum analyzer 130 in improving the ripple signal is improved.
In one embodiment, as shown in fig. 3, the arc detection device 10 of the present application may further include a communicator 140.
Specifically, the communicator 140 is connected to the controller 110 and may be configured to transmit a communication signal. For example, when the controller 110 determines that an arc fault occurs in the dc power distribution system, fault information may be output to the communicator 140, and at this time, the communicator 140 may be used to transmit the fault information to the upper computer. The communicator 140 may be a wireless signal transmitter, or may be a wired signal interface, such as an RS485 interface, and is not limited herein.
It should be understood that the inventive principle of the arc detection device 10 of the present application is to enable the dc power supply U1 to output a ripple current through the action of the arc detection device 10, and determine whether an arc is generated in the dc power distribution system by monitoring the amplitude of the ripple current. Reasonable modifications based on this application should be understood to be within the scope of this application by those skilled in the art without the exercise of inventive faculty. For example, fig. 4 illustrates an alternative embodiment of the arc detection apparatus 10 of the present application. In the embodiment shown in fig. 4, the spectrum analyzer 130 may be connected to the current sensor 120 through the communicator 140, so that if the current detection signal output from the current sensor 120 cannot be directly received by the spectrum analyzer 130, the current detection signal may be converted by the communicator 140 and then transmitted to the controller 110. Similarly, if the control signal sent by the controller 110 cannot directly control the switching converter 310, the control signal may also be converted by the communicator 140 and then transmitted to the switching converter 310, which is not described in detail herein.
The arc detection device 10 is independent of the dc distribution system and is easy to install in existing systems. Meanwhile, the arc detection device 10 can be compatible with a direct current distribution system only by simple communication, and has strong compatibility.
The present application further provides an arc detection method based on the arc detection device 10 according to any of the above embodiments. As shown in fig. 5, the arc detection method of the present application may include the steps of:
and S100, controlling the direct current power supply to output ripple current.
Namely, the controller 110 of the arc detecting device 10 controls the dc power supply U1 to output a ripple current. Generally, in order to improve the detection accuracy of the arc detection method of the present application, the ripple current may be periodically varied.
And S200, detecting the magnitude of the output current of the direct current power supply and generating a current detection signal.
That is, the current sensor 120 of the arc detection device 10 detects the magnitude of the current output from the dc power supply U1. For convenience of description, we will refer to the magnitude of the output current of the dc power supply U1 detected by the current sensor 120 as a current detection signal.
And S300, extracting a ripple signal of the ripple current according to the current detection signal.
That is, the spectrum analyzer 130 acquires the current detection signal detected by the current sensor 120, and extracts a ripple signal of the ripple current from the current detection signal. Generally, the spectrum analyzer 130 may analyze the current detection signal to extract a current signal that periodically varies back and forth, i.e., a ripple signal of the ripple current.
And S400, judging whether the direct current power distribution system has an arc fault or not according to the ripple signal.
After extracting the ripple signal, the spectrum analyzer 130 transmits the ripple signal to the controller 110. The controller 110 may be provided with a preset determination program, so as to determine whether an arc fault occurs in the dc power distribution system according to the determination program and the ripple signal.
The arc detection method is based on the current detection device and is applied to a direct current power distribution system with a direct current power supply U1. The arc detection method comprises the steps of controlling a direct current power supply U1 to output ripple current; detecting the current magnitude to generate a current detection signal; the ripple signal is extracted from the current sense signal. When an arc fault occurs in the direct current distribution system, the arc fault can cause the change of the ripple signal, so that whether the arc fault of the direct current distribution system exists or not can be obtained by monitoring whether the ripple signal changes or not. According to the arc detection method, the electric arc of the direct current power distribution system is detected through the electric structure, the influence of the environment is small, and the detection result is more accurate.
Further, the current sensor 120 in the arc detection device 10 may be a hall current sensor. Based on this, the arc detection method of the present application, the step S200, may include:
the magnitude of the current output from the dc power supply U1 is detected by a hall current sensor, and a current detection signal is generated.
In an embodiment, the step S100 of the arc detection method of the present application may specifically include:
the switching converter 310 of the dc power supply U1 is periodically perturbed so that the operating frequency of the switching converter 310 periodically changes, and the dc power supply U1 outputs a ripple current.
The operating frequency of the switching converter 310 refers to the switching frequency of the switching converter 310. Generally, the dc power supply U1 has a switching converter 310 therein for converting the power supply form. When the dc power supply U1 operates, the switching converter 310 therein operates at a fixed switching frequency. In this embodiment, the controller 110 may change the switching frequency of the switching converter 310 periodically within a certain range by changing the switching frequency of the switching converter 310, so that the dc power supply U1 can output the ripple current. For example, if the switching converter 310 in the dc power supply U1 operates at a fixed switching frequency of 10KHz without the controller 110, the controller 110 can control the switching converter 310 to periodically and reciprocally operate at a frequency of 9.9KHz to 10.1 KHz.
In one embodiment, the arc detection method of the present application, step S300, may include:
and extracting a ripple signal of the ripple current according to the amplitude variation of the current.
As is known from the above description, in the arc detection method of the present application, the controller 110 controls the switching converter 310 so that the ripple current output by the dc power supply U1 changes periodically. Generally, the noise signal generated by the controller 110 is varied irregularly. Therefore, the spectrum analyzer 130 can extract the ripple signal of the ripple current through the amplitude variation of the current, so as to avoid the interference of other noise signals in the dc power distribution system.
In one embodiment, as shown in fig. 6, the step S400 of the arc detection method of the present application may include:
s410, acquiring a ripple signal, and comparing the amplitude of the ripple signal with a first preset value.
In particular, as is known from the above description, an arc generated in an electrical circuit of a dc power distribution system can be regarded as a nonlinear resistor. When an arc fault occurs in the circuit, the arc fault causes a change in the line impedance, which increases the line impedance. At this time, the magnitude of the current in the dc bus decreases, i.e., the amplitude of the ripple signal decreases.
Based on this, after the ripple signal is obtained, the amplitude of the ripple signal may be compared with the first preset value.
And S420, if the amplitude of the ripple signal is smaller than a first preset value, an arc fault occurs in the direct current power distribution system.
In an embodiment, as shown in fig. 7, after step S400, the arc detection method of the present application may further include:
and S500, if the direct current power distribution system has an arc fault, controlling the switch converter 310 to stop working and outputting fault information.
That is, the controller 110 determines that the dc power distribution system generates an arc according to the ripple signal, that is, controls the switching converter 310 to stop operating after an arc fault occurs. At this time, when the switching converter 310 stops operating, the dc power supply U1 also stops outputting dc power. Therefore, the protection of the direct current power distribution system can be realized. The controller 110 can also output fault information to an upper computer through the communicator 140 while controlling the switching converter 310 to stop working and the direct-current power supply U1 to stop outputting direct current, so that a worker can maintain the switching converter in time.
It should be noted that the inventive concept of this embodiment is to control the dc power source U1 to stop outputting dc power after the controller 110 determines that an arc fault occurs in the dc power distribution system. Therefore, other technical means, such as controlling the switch on the dc bus to open, so as to stop the dc power supply U1 from outputting dc power, should be understood to be within the protection scope of the present embodiment.
Further, as shown in fig. 8, before step S100, the arc detection method of the present application may further include:
and S001, presetting the serial number of the direct current power supply.
Specifically, the arc detection method of the present application, in which the dc power distribution system is applied, may have a plurality of dc power sources U1. The different DC power supplies U1 may have different numbers, such as DC power supply U1-01, DC power supply U1-02, and DC power supply U1-03, respectively. In this case, each dc power source U1 may be provided with an arc detection device 10 for arc detection, and the controller 110 of the arc detection device 10 may be preset with the serial number of the dc power source U1.
The number of the dc power supply U1 may be preset in the controller 110 of the arc detection device 10 used for the dc power supply U1, or may be obtained by the controller 110 after the arc detection device 10 is connected to the dc power supply U1. And are not intended to be limiting herein.
At this time, the step S500 may include: s510, if the direct current power distribution system has an arc fault, controlling the switch converter to stop working; and S520, outputting fault information.
Wherein, step S520 may specifically be:
and acquiring the number of the direct current power supply U1, and outputting fault information comprising the number of the direct current power supply U1.
As known from step S001, the dc power sources U1 in the dc power distribution system have different numbers, and the number of the dc power source U1 is preset in the controller 110 connected to each dc power source U1. In this manner, when the controller 110 determines that a dc power distribution system arc fault has been identified, fault information including the number of the dc power source U1 may be output. For example, the controller 110 may output a DC power supply U1-02 arc fault. The arc detection device 10 can output fault information including the number of the direct current power supply U1, so that staff can quickly repair the arc fault conveniently.
Based on the arc detection device 10, the arc detection method enables all parts to work in coordination with each other step by step, and finally the arc detection can be realized only by observing the amplitude of ripple current output by the direct-current power supply U1 without a complex algorithm, so that the cost is saved.
In one embodiment, the present application also provides a dc power distribution system that may include the arc detection apparatus 10 of any of the embodiments described above.
Specifically, the dc power distribution system may include a dc power source U1 and a dc bus connected to the dc power source U1. The dc power supply U1 outputs dc power. The dc bus may be connected between the dc power source U1 and the dc load N1 to supply power to the dc load N1.
The arc detection apparatus 10 may then include a controller 110, a current sensor 120, and a spectrum analyzer 130. The controller 110 is configured to be connected to the dc power supply U1, so as to control the dc power supply U1 to output a ripple current. The current sensor 120 is provided on the dc bus of the dc power supply U1, and detects the magnitude of the output current of the dc power supply U1, and generates a current detection signal. The spectrum analyzer 130 is connected to the current sensor 120, thereby acquiring a current detection signal and extracting a ripple signal of a ripple current from the current detection signal. The spectrum analyzer 130 is further connected to the controller 110, so that the controller 110 can obtain the ripple signal and determine whether the arc fault occurs in the dc power distribution system according to the ripple signal.
The direct current power distribution system including the arc detection device 10 in the above embodiment can perform arc detection in real time during power distribution. Meanwhile, the arc detection device 10 detects the arc of the direct current distribution system through the electrical structure, the influence of the environment is small, and the detection result is more accurate.
Further, in the dc power distribution system, the dc power supply U1 has a switching converter 310. The controller 110 is connected to the switching converter 310, so as to control the switching converter 310 to enable the dc power supply U1 to output a ripple current.
Further, in the dc power distribution system, the arc detection device 10 further includes: a communicator 140. The communicator 140 is connected to the controller 110, and outputs fault information to the communicator 140 when the controller 110 determines that an arc fault occurs in the dc power distribution system.
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 express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An arc detection device for use in a dc power distribution system having a dc power source U1, the arc detection device (10) comprising:
the controller (110) is connected with the direct current power supply U1 to control the direct current power supply U1 to output ripple current and control the direct current power supply U1 to stop outputting direct current when the direct current power distribution system has an arc fault;
a current sensor (120) provided on a dc bus of the dc power supply U1 to detect the magnitude of the output current of the dc power supply U1 and generate a current detection signal;
a spectrum analyzer (130) connected with the current sensor (120) to obtain the current detection signal and extract a ripple signal of the ripple current from the current detection signal; the spectrum analyzer (130) is further connected with the controller (110) so that the controller (110) can obtain the ripple signal and judge whether an arc fault occurs in the direct current power distribution system according to the ripple signal;
a communicator (140) connected to the controller (110) to output fault information to the communicator (140) when the controller (110) determines that an arc fault occurs in the dc power distribution system.
2. The arc detection device of claim 1, wherein the dc power source U1 has a switching converter (310);
the controller (110) is connected with the switching converter (310) to control the switching converter (310) to enable the direct current power supply U1 to output ripple current.
3. The arc detection device of claim 2, wherein the switching converter (310) is a circuit employing semiconductor power periods as switches for converting one form of power supply to another form of power supply.
4. The arc detection device according to claim 1, wherein the current sensor (120) is a magneto-electric conversion device made of a semiconductor material.
5. An arc detection method based on the arc detection device (10) according to any one of claims 1 to 4, characterized by comprising:
controlling the direct current power supply U1 to output ripple current;
detecting the magnitude of the current output by the direct current power supply U1 and generating a current detection signal;
extracting a ripple signal of the ripple current according to the current detection signal;
judging whether the direct current power distribution system has an arc fault or not according to the ripple signal;
and when the arc fault occurs in the direct current power distribution system, controlling the direct current power supply U1 to stop outputting direct current and outputting fault information.
6. The arc detection method of claim 5, wherein said controlling the output ripple current of the DC power supply U1 comprises:
the method comprises the steps of periodically disturbing a switching converter (310) of the direct current power supply U1 to enable the working frequency of the switching converter (310) to be periodically changed, and enabling the direct current power supply U1 to output ripple current.
7. The arc detection method of claim 5, wherein the extracting a ripple signal of the ripple current from the current detection signal comprises:
and extracting a ripple signal of the ripple current according to the amplitude variation of the current.
8. The arc detection method of claim 5, wherein said determining whether an arc fault occurs in the DC power distribution system based on the ripple signal comprises:
acquiring the ripple signal, and comparing the amplitude of the ripple signal with a first preset value;
and if the amplitude of the ripple signal is smaller than the first preset value, the arc fault occurs in the direct current power distribution system.
9. The arc detection method according to claim 5, wherein before controlling the DC power supply U1 to output ripple current, the method further comprises:
presetting the number of the direct current power supply U1;
the outputting the fault information includes:
and acquiring the number of the direct current power supply U1, and outputting fault information comprising the number of the direct current power supply U1.
10. The arc detection method of claim 5, wherein said detecting the magnitude of the DC power supply output current and generating a current detection signal comprises:
the magnitude of the current output by the dc power supply U1 is detected by a hall current sensor, and a current detection signal is generated.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104181412A (en) * | 2013-05-24 | 2014-12-03 | Det国际控股有限公司 | Arc detection |
| CN105223427A (en) * | 2014-06-17 | 2016-01-06 | 西门子公司 | The detection method of fault electric arc and pick-up unit |
| CN106199131A (en) * | 2016-06-22 | 2016-12-07 | 华为技术有限公司 | The testing circuit of electric arc and microprocessor in a kind of DC current |
| CN206321731U (en) * | 2017-01-09 | 2017-07-11 | 浙江正泰仪器仪表有限责任公司 | A kind of fault arc detection device |
| CN107219447A (en) * | 2017-06-19 | 2017-09-29 | 安徽江淮汽车集团股份有限公司 | A kind of direct-current arc detection method and system based on impedance characteristic |
| CN107561424A (en) * | 2017-10-18 | 2018-01-09 | 河北工业大学 | Series direct current arc fault recognition methods based on sliding DFT |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8320090B2 (en) * | 2010-06-08 | 2012-11-27 | Hamilton Sundstrand Corporation | SSPC for parallel arc fault detection in DC power system |
| CN102253293A (en) * | 2011-05-30 | 2011-11-23 | 南京航空航天大学 | Detection method and device of direct current arc faults |
| JP6116495B2 (en) * | 2014-02-04 | 2017-04-19 | 三菱電機株式会社 | DC arc detection apparatus and method |
| CN104092440B (en) * | 2014-07-21 | 2017-07-28 | 阳光电源股份有限公司 | Photovoltaic system direct current arc fault detection method, device, processor and its system |
| CN105093082A (en) * | 2015-08-31 | 2015-11-25 | 上海正泰电源系统有限公司 | DC fault arc detection method |
| CN109239558B (en) * | 2018-11-08 | 2020-10-02 | 重庆大学 | Direct current fault arc detection and protection device |
| CN110417351A (en) * | 2019-08-01 | 2019-11-05 | 上海理工大学 | Photovoltaic system DC side arc fault detection systems and detection method |
| CN110441662B (en) * | 2019-08-14 | 2020-10-16 | 中国矿业大学(北京) | Direct current power supply system and method and device for detecting arc fault of direct current power supply system |
-
2020
- 2020-02-24 CN CN202010112767.9A patent/CN111289852B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104181412A (en) * | 2013-05-24 | 2014-12-03 | Det国际控股有限公司 | Arc detection |
| CN105223427A (en) * | 2014-06-17 | 2016-01-06 | 西门子公司 | The detection method of fault electric arc and pick-up unit |
| CN106199131A (en) * | 2016-06-22 | 2016-12-07 | 华为技术有限公司 | The testing circuit of electric arc and microprocessor in a kind of DC current |
| CN206321731U (en) * | 2017-01-09 | 2017-07-11 | 浙江正泰仪器仪表有限责任公司 | A kind of fault arc detection device |
| CN107219447A (en) * | 2017-06-19 | 2017-09-29 | 安徽江淮汽车集团股份有限公司 | A kind of direct-current arc detection method and system based on impedance characteristic |
| CN107561424A (en) * | 2017-10-18 | 2018-01-09 | 河北工业大学 | Series direct current arc fault recognition methods based on sliding DFT |
Non-Patent Citations (4)
| Title |
|---|
| Mitigation and analysis of arc faults in automotive DC networks;T.J. Schoepf;;《 IEEE Transactions on Components and Packaging Technologies》;20050531;全文 * |
| 低压交流电弧故障诊断方法及应用;韦强强;《中国优秀硕士学位论文全文库》;20200115;全文 * |
| 基于直流系统的故障电弧检测技术的研究;弓一飞;《电力科技》;20161231;全文 * |
| 直流电源系统中直流电弧特性及其检测方法研究;刘源;《高压电器》;20150216;全文 * |
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