Direct-current arc detection device and method and direct-current electric equipment

Abstract

The invention relates to a direct-current arc detection device and method and direct-current electric equipment. In the direct-current arc detection device, a first current transformer is used for collecting first current on a positive electrode bus; the second current transformer is used for collecting a second current on the cathode bus; the first input end of the voltage sensor is connected with the positive bus, the second input end of the voltage sensor is connected with the negative bus, and the output end of the voltage sensor is connected with the first controller and used for collecting voltage between the positive bus and the negative bus; the first controller is used for sending a first instruction under the condition that it is determined that the direct-current arc is generated according to the first current, the second current and the voltage. According to the embodiment of the invention, the method can achieve the detection and recognition of the DC arc fault, and transmits the first instruction for indicating the DC arc fault under the condition that the DC arc is determined to be generated, thereby enabling a receiver of the first instruction to make a quick response, and protecting the safety of DC electric equipment.

Description

Technical Field

[0001] The present application relates to the field of electronic technology, and in particular to a DC arc detection device, method and DC power equipment. Background Art

[0002] In recent years, with the rapid development of distributed energy, DC power consumption has received widespread attention, and the concept of DC microgrids has gradually become popular. Arcing is a gas ionization discharge phenomenon. Arcing caused by system defects such as device aging and electrical appliance damage lasts for a long time and is difficult to extinguish. In addition, the arcing process is accompanied by high temperature, strong light and electromagnetic radiation, which can easily ignite surrounding flammable materials, thereby causing electrical fires.

[0003] However, since DC current has no zero crossing point, the existing mature AC arc extinguishing technology cannot be directly applied to DC arc extinguishing, making it more difficult to extinguish DC arcs than AC arcs. The immaturity of DC arc extinguishing technology limits the promotion of DC microgrids. Therefore, improving DC arc extinguishing technology has become an important goal to promote the popularization of DC microgrids, and it is also a practical problem that needs to be solved in the safe and stable operation of my country's power system and the development of power construction. Summary of the invention

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a DC arc detection device, method and DC power equipment.

[0005] In a first aspect, the present application provides a DC arc detection device, comprising: a first current transformer, a second current transformer, a voltage sensor, and a first controller;

[0006] The input end of the first current transformer is connected to the positive bus, and the output end of the first current transformer is connected to the first controller, which is used to collect the first current on the positive bus;

[0007] The input end of the second current transformer is connected to the negative bus, and the output end of the second current transformer is connected to the first controller, and is used to collect the second current on the negative bus;

[0008] The first input end of the voltage sensor is connected to the positive bus, the second input end of the voltage sensor is connected to the negative bus, and the output end of the voltage sensor is connected to the first controller, for collecting the voltage between the positive bus and the negative bus;

[0009] The first controller is used to send a first instruction when it is determined that a DC arc is generated according to the first current, the second current and the voltage.

[0010] Optionally, the DC arc detection device further comprises: one or more of an ambient light sensor, a temperature sensor, and an electromagnetic radiation sensor;

[0011] The output end of the ambient light sensor is connected to the first controller, and is used to collect ambient light intensity to obtain light intensity data;

[0012] The output end of the temperature sensor is connected to the first controller for collecting the ambient temperature and obtaining temperature data;

[0013] The output end of the electromagnetic radiation sensor is connected to the first controller, and is used to collect environmental electromagnetic radiation signals to obtain electromagnetic radiation data;

[0014] The first controller is further configured to send a second instruction when it is determined that an abnormality caused by a DC arc exists in the environment based on one or more of the light intensity data, the temperature data, and the electromagnetic radiation data.

[0015] Optionally, the DC arc detection device further includes: a DC-DC conversion module;

[0016] The two input ends of the DC-DC conversion module are respectively connected to the positive bus and the negative bus, and the two output ends of the DC-DC conversion module are respectively connected to the first controller for converting the input voltage into a voltage used by the first controller.

[0017] In a second aspect, the present application provides a DC power-consuming device, including: a DC circuit breaker and a DC arc detection device as described in the first aspect;

[0018] The positive terminal of the DC circuit breaker is connected to the positive bus, and the negative terminal of the DC circuit breaker is connected to the negative bus, and is used to disconnect the DC circuit when receiving a first instruction from the first controller.

[0019] Optionally, the DC power-consuming device further includes: a second controller;

[0020] The second controller is further configured to send a third instruction to the DC circuit breaker upon receiving the first instruction from the first controller;

[0021] The DC circuit breaker is further configured to disconnect the DC circuit upon receiving the third instruction.

[0022] In a third aspect, the present application provides a DC power-consuming device, including: a DC circuit breaker and a DC arc detection device as described in the first aspect;

[0023] The positive terminal of the DC circuit breaker is connected to the positive bus, and disconnects the DC circuit when receiving a second instruction from the first controller.

[0024] Optionally, the DC power-consuming device further includes: a second controller;

[0025] The second controller is further configured to send a fourth instruction to the DC circuit breaker upon receiving the second instruction from the first controller;

[0026] The DC circuit breaker is further configured to disconnect the DC circuit upon receiving the fourth instruction.

[0027] Optionally, the DC power-consuming device further includes: one or more of a voltage stabilizing and filtering module, a positive electrode fuse, and a negative electrode fuse;

[0028] The voltage stabilizing and filtering modules are respectively connected to the positive bus and the negative bus, and are used to stabilize the input voltage value and shield the interference to the power supply line when the electrical equipment is connected;

[0029] The positive electrode fuse is connected to the positive electrode bus, and the negative electrode fuse is connected to the negative electrode bus. The positive electrode fuse and / or the negative electrode fuse are used to fuse the circuit when a short circuit or overcurrent occurs in the DC circuit.

[0030] In a fourth aspect, the present application provides a DC arc detection method, which is applied to a first controller, and the method includes:

[0031] receiving a first current from a first current transformer, a second current from a second current transformer, and a voltage from a voltage sensor;

[0032] generating signal waveform data according to one or more of the first current, the second current and the voltage;

[0033] If the fluctuation of the signal waveform data meets the preset conditions, it is determined that a DC arc is generated and a first instruction is sent.

[0034] Optionally, the method further comprises:

[0035] Receiving light intensity data from an ambient light sensor, temperature data from a temperature sensor, and electromagnetic radiation data from an electromagnetic radiation sensor;

[0036] If the light intensity data is outside the preset light intensity range, the temperature data is outside the preset temperature range, or the electromagnetic radiation data is outside the preset electromagnetic radiation data range, it is determined that an abnormality caused by a DC arc exists in the environment, and a second instruction is sent.

[0037] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0038] The embodiment of the present application detects the current on the DC bus through the first current transformer and the second current transformer, detects the voltage on the DC bus through the voltage sensor, and uses the current and voltage as the main characteristic quantities for identifying the DC arc fault to realize the detection and identification of the DC arc fault. When it is determined that a DC arc has occurred, a first instruction for indicating a DC arc fault is sent so that the recipient of the first instruction can respond quickly to protect the safety of the DC power-consuming equipment. Moreover, the DC arc detection device in the embodiment of the present application is small in size and simple in structure, and can be integrated into most DC power-consuming equipment to protect the power safety of the DC power-consuming equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0041] Figure 1 A structural diagram of a DC arc detection device and a DC circuit protection device provided in an embodiment of the present application;

[0042] Figure 2 A flow chart of a DC arc detection method provided in an embodiment of the present application;

[0043] Figure 3 A flow chart of another DC arc detection method provided in an embodiment of the present application;

[0044] Figure 4 A flow chart of a DC arc detection method in practical application provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0046] Since DC current has no zero crossing point, the existing mature AC arc extinguishing technology cannot be directly applied to DC arc extinguishing, making it more difficult to extinguish a DC arc than an AC arc. The immaturity of DC arc extinguishing technology limits the promotion of DC microgrids. Therefore, improving DC arc extinguishing technology has become an important goal to promote the popularization of DC microgrids, and it is also a practical problem that needs to be solved urgently in the safe and stable operation of my country's power system and the development of power construction. Based on the above problems, the embodiments of the present application provide a DC arc detection device, method and DC power equipment.

[0047] The present application embodiment provides a DC arc detection device, such as Figure 1 As shown, it includes: a first current transformer 3, a second current transformer 4, a voltage sensor 5 and a first controller 14; the input terminal 1 and the output terminal 12 are used for external wiring to enable the protection system to be powered and monitor electrical equipment.

[0048] The input end of the first current transformer 3 is connected to the positive bus, and the output end of the first current transformer 3 is connected to the first controller 14, which is used to collect the first current on the positive bus;

[0049] The input end of the second current transformer 4 is connected to the negative bus, and the output end of the second current transformer 4 is connected to the first controller 14, for collecting the second current on the negative bus;

[0050] The first input end of the voltage sensor 5 is connected to the positive bus, the second input end of the voltage sensor 5 is connected to the negative bus, and the output end of the voltage sensor 5 is connected to the first controller 14, for collecting the voltage between the positive bus and the negative bus;

[0051] The first controller 14 is used to send a first instruction when it is determined that a DC arc is generated according to the first current, the second current and the voltage.

[0052] The first controller 14 is used to analyze and process the collected signals, and includes a DSP signal analysis and processing unit. When the electrical signals collected by the first current transformer 3, the second current transformer 4 and the voltage sensor 5 are transmitted to the first controller 14, the DSP signal analysis and processing unit will perform waveform and mathematical conversion analysis on the received data. The U / I / P energy data of the electrical equipment can be collected and calculated in real time through the current transformer and the voltage sensor, and then it can be determined whether an arc occurs in the line through a specific algorithm.

[0053] In one embodiment of the present application, the DSP signal analysis processing unit can perform waveform analysis of current and voltage: when an arc fault occurs, the current and voltage waveforms will show the characteristics of rapid fluctuations or irregular changes. Under normal circumstances, the current and voltage of the DC circuit should be relatively stable and smooth. When an arc fault occurs, the current and voltage will rise and fall rapidly, forming pulses or spikes. By analyzing these characteristics of the current and voltage waveforms, arc faults can be identified.

[0054] In one embodiment of the present application, the DSP signal analysis processing unit can perform a fast-changing frequency detection mathematical conversion analysis: arc faults will generate high-frequency current and voltage fluctuations, because in the arc channel, the passage of current will be affected by the gap, resulting in rapid current interruption. Detecting these high-frequency changes can identify arc faults, so in frequency analysis, discrete current or voltage signals are represented by discrete Fourier transforms, and the frequency characteristics of the signals are analyzed to identify high-frequency components unique to arc faults.

[0055] Alternatively, the energy of the signal within a specific time or frequency range is calculated. Specifically, the energy of the signal within a specific time or frequency range can be calculated by integrating or summing the square of the signal within the specific time or frequency range. For frequency domain signals, the frequency domain energy can be calculated by integrating or summing the square of the frequency domain signal amplitude. For example, for a discrete frequency signal X(k), its energy E can be calculated as follows: formula (1), where N is the number of frequency points, and |X[k]|2 represents the square of the frequency domain amplitude. For continuous frequency domain signals, integration replaces summation, and the following formula (2) is calculated, where X(f) is the frequency domain signal, and integration is performed at all frequency points. In the case of an arc fault, the signal energy may be concentrated in a specific frequency band, and the arc fault can be identified.

[0056]

[0057] In the embodiment of the present application, the first instruction is used to indicate the occurrence of a DC arc fault so that the device communicating with the first controller 14 can take corresponding response actions, such as: cutting off the circuit and / or issuing an alarm signal.

[0058] In addition, when an arc fault occurs in the line, the arc fault location can be calculated through the time difference of the fault arc current collected by the two current transformers and a specific algorithm, which is convenient for maintenance personnel to inspect. Furthermore, the current data at different locations can be monitored and obtained through multiple current transformers at different locations, and the fault location can be located using the time difference. The current transformer close to the arc occurrence side can detect the fault signal faster; if a single sensor is used, it can only monitor whether a fault arc occurs at the current installation location, and cannot locate the fault location.

[0059] The embodiment of the present application detects the current on the DC bus through the first current transformer and the second current transformer, detects the voltage on the DC bus through the voltage sensor, and uses the current and voltage as the main characteristic quantities for identifying the DC arc fault to realize the detection and identification of the DC arc fault. When it is determined that a DC arc has occurred, a first instruction for indicating a DC arc fault is sent so that the recipient of the first instruction can respond quickly to protect the safety of the DC power-consuming equipment. Moreover, the DC arc detection device in the embodiment of the present application is small in size and simple in structure, and can be integrated into most DC power-consuming equipment to protect the power safety of the DC power-consuming equipment.

[0060] In another embodiment of the present application, Figure 1 As shown, the DC arc detection device further includes: one or more of an ambient light sensor 6, a temperature sensor 7, and an electromagnetic radiation sensor 8;

[0061] The output end of the ambient light sensor 6 is connected to the first controller 14 to collect ambient light intensity and obtain light intensity data;

[0062] The output end of the temperature sensor 7 is connected to the first controller 14 to collect the ambient temperature and obtain temperature data;

[0063] The output end of the electromagnetic radiation sensor 8 is connected to the first controller 14, and is used to collect environmental electromagnetic radiation signals to obtain electromagnetic radiation data;

[0064] The first controller 14 is further configured to send a second instruction when it is determined that an abnormality caused by a DC arc exists in the environment based on one or more of the light intensity data, the temperature data, and the electromagnetic radiation data.

[0065] In order to improve the fault recognition rate, the first controller 14 will also analyze and judge the data collected by the ambient light sensor 6, the temperature sensor 7 and the electromagnetic radiation sensor 8, and judge whether there is abnormal light, abnormal temperature, and / or abnormal electromagnetic radiation in the environment according to specific values. Then the controller slave board will send the collected data and the arc judgment signal to the second controller.

[0066] Furthermore, the first controller makes a judgment by comparing the difference between the sensor sampling values ​​before and after two times within a fixed time interval. If the difference between the sensor sampling values ​​before and after two times exceeds a certain threshold, or the cumulative change within a certain period of time exceeds the threshold, it is judged that abnormal lighting, abnormal temperature or abnormal electromagnetic radiation is generated, and then it can be determined that a DC arc fault abnormality has occurred. The cumulative over-limit judgment method is used as a supplement to waveform analysis and mathematical conversion analysis, and is used to assist the system in improving the arc fault recognition rate.

[0067] In an embodiment of the present application, the second instruction is used to indicate the presence of an abnormality caused by a DC arc in the environment. The second instruction may carry indication information, light intensity data, temperature data, electromagnetic radiation data, etc., used to indicate the presence of an abnormality caused by a DC arc in the environment, so that the device communicating with the first controller can make corresponding response actions, such as: cutting off the circuit, issuing an alarm signal, displaying light intensity data, temperature data, electromagnetic radiation data, etc.

[0068] Since DC arcs are often accompanied by high temperatures, strong light and electromagnetic radiation during the arcing process, in the embodiment of the present application, an ambient light sensor is used to collect light intensity data in the environment, a temperature sensor is used to monitor temperature data in the environment, and an electromagnetic radiation sensor is used to detect electromagnetic radiation data in the environment. The light intensity data, temperature data and electromagnetic radiation data are used as secondary feature quantities for identifying DC arc faults. The first controller analyzes whether the light intensity data, temperature data and electromagnetic radiation data are abnormal, determines whether there are abnormal conditions caused by DC arc burning in the environment, and improves the success rate of DC arc recognition. When it is determined that there are abnormal conditions caused by DC arcs in the environment, a second instruction is sent so that the recipient of the second instruction can respond quickly to protect the safety of DC power-using equipment.

[0069] In another embodiment of the present application, Figure 1 As shown, the DC arc detection device further includes: a DC-DC conversion module 11;

[0070] The two input ends of the DC-DC conversion module 11 are respectively connected to the positive bus and the negative bus, and the two output ends of the DC-DC conversion module 11 are respectively connected to the first controller 14 for converting the input voltage into a voltage used by the first controller 14 .

[0071] The DC-DC conversion module 11 of the embodiment of the present application is used to transform the input voltage value, converting strong electricity into weak electricity, thereby supplying power to the sensor, the first controller, the second controller, and the display and alarm module.

[0072] In another embodiment of the present application, a DC power-consuming device is also provided, such as Figure 1 As shown, it includes: a DC circuit breaker 9 and the DC arc detection device as described in the above embodiment;

[0073] The positive terminal of the DC circuit breaker 9 is connected to the positive bus, and the negative terminal of the DC circuit breaker 9 is connected to the negative bus, and is used to disconnect the DC circuit when receiving the first instruction from the first controller 14.

[0074] In the embodiment of the present application, the DC circuit breaker 9 is a DC circuit breaker with a shunt tripping function, which is used to disconnect the circuit when receiving the first instruction to protect the DC circuit.

[0075] The DC circuit breaker of the embodiment of the present application can disconnect the DC circuit upon receiving a first instruction, and can control the opening and closing of the DC circuit breaker when a DC arc fault is identified, thereby achieving rapid fault isolation and protection of the DC system and effectively cutting off the DC arc fault, thereby ensuring the safe and stable operation of DC electrical equipment.

[0076] In another embodiment of the present application, Figure 1 As shown, the DC power-consuming device further includes: a second controller 15;

[0077] The second controller 15 is further configured to send a third instruction to the DC circuit breaker 9 upon receiving the first instruction from the first controller 14;

[0078] The DC circuit breaker 9 is further configured to disconnect the DC circuit upon receiving the third instruction.

[0079] In the embodiment of the present application, the DC circuit breaker 9 is a DC circuit breaker with a shunt tripping function, which is used to disconnect the circuit when receiving the third instruction to protect the DC circuit.

[0080] In another embodiment of the present application, a DC power-consuming device is also provided, such as Figure 1 As shown, it includes: a DC circuit breaker 9 and the DC arc detection device as described in the above embodiment;

[0081] The positive terminal of the DC circuit breaker 9 is connected to the positive bus bar, and disconnects the DC circuit when receiving the second instruction from the first controller 14 .

[0082] In the embodiment of the present application, the DC circuit breaker 9 is a DC circuit breaker with a shunt tripping function, which is used to disconnect the circuit when receiving the second instruction to protect the DC circuit.

[0083] In another embodiment of the present application, Figure 1 As shown, the DC power-consuming device further includes: a second controller 15;

[0084] The second controller 15 is further configured to send a fourth instruction to the DC circuit breaker 9 upon receiving the second instruction from the first controller 14;

[0085] The DC circuit breaker 9 is further configured to disconnect the DC circuit upon receiving the fourth instruction.

[0086] In the embodiment of the present application, the DC circuit breaker 9 is a DC circuit breaker with a shunt tripping function, which is used to disconnect the circuit when receiving the fourth instruction to protect the DC circuit.

[0087] In another embodiment of the present application, Figure 1 As shown, the DC power-consuming device further includes: a voltage stabilizing and filtering module 2, one or more of a positive pole fuse 10 and a negative pole fuse 11;

[0088] The voltage stabilizing and filtering module 2 is connected to the positive bus and the negative bus respectively, and is used to stabilize the input voltage value and shield the interference to the power supply line when the electrical equipment is connected;

[0089] The voltage stabilizing and filtering module 2 is used to stabilize the input voltage value and shield the interference to the power supply line when the electrical equipment is connected. The use of the voltage stabilizing and filtering module 2 can not only make the electrical equipment work stably, but also avoid the protection system from mistakenly identifying the interference signal as an arc fault signal and causing false tripping, thereby improving the fault recognition rate of the protection equipment.

[0090] The positive electrode fuse 10 is connected to the positive electrode bus, and the negative electrode fuse 11 is connected to the negative electrode bus. The positive electrode fuse 10 and / or the negative electrode fuse 11 are used to fuse the circuit when a short circuit or overcurrent occurs in the DC circuit.

[0091] The positive fuse 10 and the negative fuse 11 are used to quickly and automatically blow when a short circuit or severe overcurrent occurs in the circuit, thereby cutting off the circuit and protecting the circuit safety.

[0092] In another embodiment of the present application, Figure 1 As shown, the DC power-consuming equipment also includes: a display and alarm module 16, which is composed of a liquid crystal touch screen and a buzzer. The liquid crystal touch screen is used to display signal data, parameter settings, historical record viewing and resetting, etc., and the buzzer is used to sound an alarm to inform maintenance and operating personnel of a fault.

[0093] Based on the above embodiment, the second controller 15 is used to receive the electrical signal sent from the controller board and to act according to the arc judgment signal sent from the controller board. Exemplarily, the first instruction can be a high level 1, which is used to indicate that a DC arc fault has occurred. When no DC arc fault has occurred, the first controller can send a low level.

[0094] When the arc judgment signal is 0, the second controller transmits signals such as voltage, current, light intensity, temperature, etc. to the LCD screen in the display and alarm module 16 for display; when the arc judgment signal is 1, the second controller sends a trip signal to the circuit breaker 9 to disconnect the line, and at the same time transmits signals such as voltage, current, light intensity, temperature, fault, etc. to the LCD screen in the display and alarm module 16 for display, and at the same time, the buzzer in the display and alarm module starts working and emits an alarm sound.

[0095] In another embodiment of the present application, a DC arc detection method is also provided, which is applied to the first controller in the above embodiment, such as Figure 2 As shown, the method includes:

[0096] Step S101, receiving a first current from a first current transformer, a second current from a second current transformer, and a voltage from a voltage sensor;

[0097] Step S102, generating signal waveform data according to one or more of the first current, the second current and the voltage;

[0098] Step S103: If the fluctuation of the signal waveform data meets the preset condition, it is determined that a DC arc is generated and a first instruction is sent.

[0099] The embodiment of the present application detects the current on the DC bus through the first current transformer and the second current transformer, detects the voltage on the DC bus through the voltage sensor, and uses the current and voltage as the main characteristic quantities for identifying the DC arc fault to realize the detection and identification of the DC arc fault. When it is determined that a DC arc has occurred, a first instruction for indicating a DC arc fault is sent so that the recipient of the first instruction can respond quickly to protect the safety of the DC power-consuming equipment. Moreover, the DC arc detection device in the embodiment of the present application is small in size and simple in structure, and can be integrated into most DC power-consuming equipment to protect the power safety of the DC power-consuming equipment.

[0100] In another embodiment of the present application, Figure 3 As shown, the method also includes:

[0101] Step S201, receiving light intensity data from an ambient light sensor, temperature data from a temperature sensor, and electromagnetic radiation data from an electromagnetic radiation sensor;

[0102] Step S202: if the light intensity data is outside the preset light intensity range, the temperature data is outside the preset temperature range, or the electromagnetic radiation data is outside the preset electromagnetic radiation data range, it is determined that an abnormality caused by a DC arc exists in the environment, and a second instruction is sent.

[0103] For ease of understanding, the present application also provides a flow chart of a DC arc detection method as shown in Figure 4 As shown, after the DC arc detection device and the DC circuit protection system are connected, and the initialization reset and parameter setting are performed in the LCD touch screen, the current transformer, voltage sensor, temperature sensor, ambient light sensor, electromagnetic radiation sensor, etc. begin to collect information in the circuit, and the controller from the board processes and analyzes the collected information, and determines whether there is an arc in the circuit through a specific algorithm. When a fault is detected, that is, when the arc judgment signal sent by the controller from the board is 1, the second controller sends a trip signal to the circuit breaker to disconnect the circuit, and at the same time sends the collected voltage, current and other information and fault location information to the LCD screen, and makes the buzzer work and emit an alarm sound. When no arc is detected in the circuit, that is, when the arc judgment signal sent by the controller from the board is 0, the controller from the board sends voltage, current, temperature and other data to the main board, and displays it on the LCD screen, and then the protection system re-detects the voltage, current, temperature and other signals to start the next round of monitoring.

[0104] Since DC arcs are often accompanied by high temperatures, strong light and electromagnetic radiation during the arcing process, in the embodiment of the present application, an ambient light sensor is used to collect light intensity data in the environment, a temperature sensor is used to monitor temperature data in the environment, and an electromagnetic radiation sensor is used to detect electromagnetic radiation data in the environment. The light intensity data, temperature data and electromagnetic radiation data are used as secondary feature quantities for identifying DC arc faults. The first controller analyzes whether the light intensity data, temperature data and electromagnetic radiation sensor data are abnormal, determines whether there are abnormal conditions caused by DC arc burning in the environment, improves the success rate of DC arc recognition, and sends a second instruction when it is determined that there are abnormal conditions caused by DC arcs in the environment so that the recipient of the second instruction can respond quickly to protect the safety of DC power-using equipment.

[0105] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0106] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A DC arc detection device, characterized in that: include: A first current transformer, a second current transformer, a voltage sensor and a first controller; The input end of the first current transformer is connected to the positive bus, and the output end of the first current transformer is connected to the first controller, which is used to collect the first current on the positive bus; The input end of the second current transformer is connected to the negative bus, and the output end of the second current transformer is connected to the first controller, and is used to collect the second current on the negative bus; The first input end of the voltage sensor is connected to the positive bus, the second input end of the voltage sensor is connected to the negative bus, and the output end of the voltage sensor is connected to the first controller, for collecting the voltage between the positive bus and the negative bus; The first controller is used to send a first instruction when it is determined that a DC arc is generated according to the first current, the second current and the voltage.

2. The DC arc detection device according to claim 1, characterized in that: Also includes: one or more of an ambient light sensor, a temperature sensor, and an electromagnetic radiation sensor; The output end of the ambient light sensor is connected to the first controller, and is used to collect ambient light intensity to obtain light intensity data; The output end of the temperature sensor is connected to the first controller for collecting the ambient temperature and obtaining temperature data; The output end of the electromagnetic radiation sensor is connected to the first controller, and is used to collect environmental electromagnetic radiation signals to obtain electromagnetic radiation data; The first controller is further configured to send a second instruction when it is determined that an abnormality caused by a DC arc exists in the environment based on one or more of the light intensity data, the temperature data, and the electromagnetic radiation data.

3. The DC arc detection device according to claim 1, characterized in that: Also includes: DC-DC conversion module; The two input ends of the DC-DC conversion module are respectively connected to the positive bus and the negative bus, and the two output ends of the DC-DC conversion module are respectively connected to the first controller for converting the input voltage into a voltage used by the first controller.

4. A DC power-consuming device, characterized in that: include: A DC circuit breaker and a DC arc detection device as claimed in claim 1 or 3; The positive terminal of the DC circuit breaker is connected to the positive bus, and the negative terminal of the DC circuit breaker is connected to the negative bus, and is used to disconnect the DC circuit when receiving a first instruction from the first controller.

5. The DC power equipment according to claim 4, characterized in that: Also includes: A second controller; The second controller is further configured to send a third instruction to the DC circuit breaker upon receiving the first instruction from the first controller; The DC circuit breaker is further configured to disconnect the DC circuit upon receiving the third instruction.

6. A DC power-consuming device, characterized in that: include: A DC circuit breaker and a DC arc detection device as claimed in claim 2; The positive terminal of the DC circuit breaker is connected to the positive bus, and disconnects the DC circuit when receiving a second instruction from the first controller.

7. The DC power equipment according to claim 6, characterized in that: Also includes: A second controller; The second controller is further configured to send a fourth instruction to the DC circuit breaker upon receiving the second instruction from the first controller; The DC circuit breaker is further configured to disconnect the DC circuit upon receiving the fourth instruction.

8. The DC power equipment according to claim 4 or 6, characterized in that: Also includes: One or more of a voltage stabilizing filter module, a positive fuse and a negative fuse; The voltage stabilizing and filtering modules are respectively connected to the positive bus and the negative bus, and are used to stabilize the input voltage value and shield the interference to the power supply line when the electrical equipment is connected; The positive electrode fuse is connected to the positive electrode bus, and the negative electrode fuse is connected to the negative electrode bus. The positive electrode fuse and / or the negative electrode fuse are used to fuse the circuit when a short circuit or overcurrent occurs in the DC circuit.

9. A DC arc detection method, characterized in that: Applied to a first controller, the method comprises: receiving a first current from a first current transformer, a second current from a second current transformer, and a voltage from a voltage sensor; generating signal waveform data according to one or more of the first current, the second current and the voltage; If the fluctuation of the signal waveform data meets the preset conditions, it is determined that a DC arc is generated and a first instruction is sent.

10. The DC arc detection method according to claim 9, characterized in that: The method further comprises: Receiving light intensity data from an ambient light sensor, temperature data from a temperature sensor, and electromagnetic radiation data from an electromagnetic radiation sensor; If the light intensity data is outside the preset light intensity range, the temperature data is outside the preset temperature range, or the electromagnetic radiation data is outside the preset electromagnetic radiation data range, it is determined that an abnormality caused by a DC arc exists in the environment, and a second instruction is sent.

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