The invention relates to a DC fault arc detection and protection device, and belongs to the field of electrical engineering The device comprises a high-frequency current transformer, a Hall current sensor, an amplifier, a bandpass filter, a high-precision ADC, a digital signal processor (DSP) and an IGBT circuit breaker, an output terminal of the high-frequency current transformer is connected with an input terminal of the amplifier, an output terminal of the amplifier is connected with an input terminal of the bandpass filter, an output terminal of the bandpass filter is connected with an input terminal of an AD sampling circuit, an output terminal of the AD sampling circuit is connected with an input terminal of the digital signal processor, and an output terminal of the digital signalprocessor (DSP) is connected with the IGBT circuit breaker A current signal obtains a high-frequency current component through coupling via the high-frequency current transformer, the signal is amplified by 10 times through the amplifier and then passes through the bandpass filter, the ADC samples the signal and transmits the signal to the DSP for algorithm processing, the Hall current sensor transmits a detected DC current value to the DSP for dynamic threshold calculation, and an arc is extinguished through the circuit breaker after detection of arc generation so that protection is realized

DC fault arc detection and protection device

The embodiments of the invention disclose a direct-current arc fault detection method, device and system. The method includes the following steps that: the current high-frequency components of direct-current signals in a first time period are detected; when the number of the current high-frequency components detected within the first time period is greater than a first preset threshold value, andthe current high-frequency components of the direct-current signals within a second time period after the first time period are detected; when the number of the current high-frequency components detected in the second time period is larger than a second preset threshold value, it is judged that an direct-current electric arc fault occurs. According to the direct-current arc fault detection method,device and system provided by the embodiments of the invention, the threshold values for the numbers of the current high-frequency components are set respectively in an arcing stage and a stabilization stage; and whether an arc fault is detected or not is comprehensively determined based on the judgment results of the two threshold values, so that the problem that tripping is rejected when tripping is needed or tripping is performed unnecessarily when tripping is not needed can be solved.

Direct-current arc fault detection method, device and system

The embodiment of the present application discloses an arc detection and protection method for an energy storage system and a related device, which are used for improving the accuracy of arc detectionin an energy storage system and adopting an arc extinguishing measure in time to reduce the probability of causing a safety hazard. The method of the embodiment of the present application comprises the following steps: an electrical signal of an electrical connection point in the energy storage system is acquired by a control device; a frequency domain amplitude is determined by the control device according to the frequency domain characteristic of the electrical signal; and when the frequency domain amplitude is greater than a preset amplitude, the energy storage system is controlled by thecontrol device to perform arc extinguishing and protection operations on the electrical connection point.

Arc detection and protection method for energy storage system and related device

The invention relates to an arc fault detection method and device. The method includes the following steps that: a preset time domain load model is adopted to sample the electrical signals of a circuit to be detected, and the residual values of the electrical signals at sampling points within a current calculation period are calculated; whether an arc fault occurs on the circuit to be detected ata current time point is judged according to the residual values of the electrical signals at the sampling points within the current calculation period; when the arc fault occurs on the circuit to be detected, the parameters of the preset time domain load model are updated according to the actual value of the electrical signals at the current sampling point and the parameter update state of the time domain load model, wherein the parameters include orders, coefficients and sampling rates; and the updated time domain load model is adopted to re-sample the electrical signals of the circuit to bedetected, and whether an arc fault occurs on the circuit to be detected at a next time point is judged. With the above technical schemes of the invention adopted, the time domain load model-based detection method can be improved.

Arc fault detection method and device

The invention provides a fault arc detecting method. During arc generating, a device detects the arc current signal frequency domain characteristic quantity and emits an alarming signal, and meanwhilenormal load powering-on without alarming needs to be guaranteed; and a current signal, data obtained through AD sampling after smoothing, and the analysis result for the data are transmitted to a center control machine continuously. Through the fault arc detecting method, by detecting the arc wave state of the set time period, fault arc detecting is conducted through logical judgment; the technical problems that in the prior art, a treating method is complex, equipment requirements and the manufacturing cost are high, and detecting accuracy is low are solved; and the fault arc detecting method which is safe, stable, easy to use, quick in calculating, low in hardware equipment requirement and low in manufacturing cost is provided.

Fault arc detecting method

The invention relates to a DC fault arc detection method. The method is characterized by comprising the following steps of 1, sampling, filtering and conducting the fast Fourier transformation on an input current of a high-frequency power electronic converter to obtain an amplitude-versus-frequency curve for the high-frequency components of the current; 2, selecting at least one frequency band containing a switching frequency or a multiple frequency from the amplitude-versus-frequency curve, and calculating the peak value D1 of the magnitude of the curve and the mean value D2 of the magnitude of the curve within the selected frequency band. Based on the change of the distance between the peak value D1 and the mean value D2, whether an arc is generated or not can be judged. If the mean value D2 gets closer to the peak value D1, the arc is judged to be generated. Otherwise, no arc is generated. According to the novel DC fault arc detection method, based on the own characteristics of the converter, noise signals are generated by the high-frequency components of the direct current at the frequency multiplication points of the switching frequency of the converter. By utilizing the noise signals, the arc spectrum of an arc fault can be analyzed and calculated. In this way, whether the arc fault occurs or not can be detected.

DC fault arc detection method

The utility model relates to a direct current trouble arc detection device, including impulse transformer, its characterized in that still includes band -pass filtering and amplifying circuit, AD sampling circuit and MCU processing unit, and wherein, impulse transformer's current output terminal links to each other with band -pass filtering and amplifying circuit's input, and AD sampling circuit's input is connected to band -pass filtering and amplifying circuit's output, and AD sampling circuit's output links to each other with MCU processing unit's input. To dc power converter field, the utility model provides a novel converter self characteristic is utilized to direct current trouble arc detection method, and the direct current highs all can produce noise signal in converter switching frequency's doubling of frequency department, utilizes this noise signal to carry out analytical calculation to the fault electric arc frequency spectrum to this comes the detection whether to break down electric arc.

Direct current trouble arc detection device

A direct current (DC) fault arc detection method, including performing sampling, filtering and fast Fourier transform (FFT) on an input current of a high frequency power electronics converter, to obtain an amplitude-frequency characteristic curve of a current high frequency component; and selecting, from the amplitude-frequency characteristic curve, at least one frequency band including a switching frequency or a multiple frequency, calculating a peak value D1 of amplitudes and an average value D2 of the amplitudes within the frequency band, and determining, according to a change of a distance between the peak value D1 and the average value D2, whether an arc occurs, where if the average value D2 approaches the peak value D1, an arc occurs; otherwise, no arc occurs.

Direct current fault arc detection method background

Direct current fault arc detection method

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DC fault arc detection method

Direct current trouble arc detection device

Direct current fault arc detection method background

Direct current fault arc detection method