481 results about "Grounding Malfunction" patented technology

The invention relates to the technical field of cable positioning, in particular to a one-way grounding fault positioning method based on a signal injection method. The method comprises the following steps: installing an impedance detection unit at a grounding knife switch of a transformer substation, and injecting a controllable AC signal into a power transmission line through a built-in injection coil to enable the line to be in an open circuit state; collecting the injected current signal and performing frequency enhancement to extract the amplitude and phase of a target frequency component; zero-sequence impedance is calculated based on the injection voltage and current, and the zero-sequence impedance is compared with a preset impedance model to judge single-phase grounding; and when a fault is detected, determining a fault distance, a tower position and a grounding phase according to an impedance difference matching result, thereby realizing accurate positioning. According to the invention, by injecting the controllable AC signal into the power transmission line and combining frequency enhancement, phase self-calibration and impedance difference matching analysis, high-sensitivity detection, high-stability signal extraction and high-precision positioning of the single-phase earth fault are realized.

The invention relates to the technical field of power distribution network fault detection, and discloses a power distribution network high-resistance grounding fault intelligent detection method, system and device and a medium, and the method comprises the steps: collecting a power distribution network line transient signal which comprises a transient zero-sequence voltage signal and a transient zero-sequence current signal; preprocessing the transient signal and extracting a multi-dimensional feature set for representing high-resistance grounding fault characteristics, wherein the multi-dimensional feature set comprises a transient energy feature, a wavelet entropy feature and a harmonic component feature; and inputting the extracted multi-dimensional feature set into a pre-trained machine learning model, and simultaneously outputting a judgment result of the high-resistance grounding fault and an estimated value of the grounding resistance through the machine learning model. According to the method, the transient energy, the multi-scale wavelet entropy, the odd harmonic amplitude and the phase, which are derived from different analysis domains and have complementary physical meanings, are deeply fused, so that the problem that a single feature is weak in characterization capability and easy to fail under the conditions of high noise and high resistance is effectively solved.

The invention discloses a centralized FA broken line positioning criterion anti-interference method considering noise interference, and the method comprises the steps: collecting the data of each node of a power distribution network line in real time, building a sequence component network model under a single-phase broken line ungrounded fault, carrying out the dynamic threshold analysis of an electrical quantity through employing a sliding time window algorithm, and setting an electrical quantity mutation criterion. And constructing an anti-interference criterion, determining whether to trigger fault positioning or not through the anti-interference criterion when sudden change of electrical quantity occurs, determining a fault section in combination with topology analysis when fault positioning is performed, and controlling upstream and downstream switches to isolate the fault and transfer the fault to a non-fault section. According to the scheme, various noise interferences in the power distribution network are effectively suppressed, the accuracy of fault signal judgment is improved, and the conditions of misjudgment and missed judgment are reduced; secondly, considering different conditions of the power distribution network, performing targeted setting and adjustment on a sequence component network model, an anti-interference criterion threshold value and the like, so that the method can adapt to a complex power distribution network operation environment, and the reliability of fault positioning is improved.

The invention belongs to the technical field of power transmission and distribution of a power system, and particularly discloses a DR-MMC alternating-current and direct-current hybrid grid-connected system single-pole grounding fault ride-through method. The DR-MMC alternating-current and direct-current hybrid grid-connected system is constructed based on an offshore alternating-current wind power plant, an alternating-current collection submarine cable, an offshore direct-current wind power plant, a direct-current collection submarine cable, an offshore converter station, a direct-current sending-out submarine cable and an onshore converter station, and a connecting transformer valve side winding of the onshore converter station adopts high-resistance grounding. Judging whether the direct-current submarine cable has a single-pole grounding fault or not; and reducing the voltage instruction value and the power instruction value under the condition that the single-pole grounding fault occurs in the direct-current submarine cable, so that the transmission power of the grid-connected system is maintained at the preset transmission power, and the voltage and the current of the grid-connected system are maintained in a safe range. For a DR-MMC alternating current and direct current hybrid grid-connected system single-pole grounding fault, efficient and reliable fault ride-through can be realized through the method and the device.

The invention relates to the technical field of power distribution network fault monitoring and forest fire early warning, and discloses a high-voltage line tree line fault ignition time early warning method and device and a medium, and the method comprises the steps: collecting electrical characteristic data and non-electrical characteristic data in a single-phase tree contact grounding fault process in real time; performing preprocessing and sliding window processing on the electrical characteristic data to screen out a key characteristic set; establishing a thermal-electric coupling model representing the exponential decay relation of the equivalent grounding resistance along with the rise of the tree body temperature; training a plurality of different types of data-driven models based on the key feature set to regressively predict the ignition time countdown; taking prediction results of the plurality of data driving models on the training set as input, and taking real ignition time as a target to train a linear regression model as a fusion device so as to obtain an ignition time countdown early warning model; and according to a final predicted value output by the ignition time countdown early-warning model, determining and outputting an early-warning level and a confidence coefficient. According to the invention, early warning can be realized hundreds of seconds before open fire appears.

The embodiment of the invention discloses a high-resistance grounding fault active line selection method, device and system, relates to the technical field of power distribution network relay protection, and aims to solve the problems of low sensitivity and poor reliability of high-resistance grounding fault line selection. The method comprises the following steps: when fault starting is monitored, controlling a switch assembly connected with a damping resistor in a neutral point grounding loop to act so as to change the access state of the damping resistor; collecting bus zero-sequence voltage and zero-sequence current of each feeder line before and after the action of the switch assembly; calculating the zero-sequence active power variation of each feeder line before and after the action; and finally, comparing the zero-sequence active power variation of each feeder line to determine a fault feeder line. According to the invention, excitation is actively injected and the power variation is analyzed, so that the fault characteristics are enhanced, and the method has the beneficial effects of high sensitivity and high reliability.

The invention relates to the technical field of power distribution network fault detection, and discloses a power distribution network ground fault detection method, device and system, a medium and equipment, and the method comprises the steps: collecting a three-phase current signal on a power distribution network line, and judging whether the three-phase current signal meets a fault detection starting condition or not; when the condition is satisfied, inputting three-phase current waveform data in a preset duration before and after the starting moment into the convolutional neural network model to obtain a fault prediction probability of the power distribution network line; when the fault prediction probability is greater than a probability threshold value, generating a tripping instruction used for controlling opening of a circuit breaker connected with the fault line in the power distribution network line; and if the grounding fault is not detected to be isolated within the preset time, triggering the upstream protection node to execute backup tripping operation based on time differential delay. According to the method, pure current driving, intelligent identification, on-site quick action and differential backup are combined, high-precision identification of a power distribution network ground fault reduction dependence condition is achieved, and high-reliability small-range isolation of the ground fault is achieved.

The invention discloses an arc suppression coil grounding fault positioning method based on a transformer substation line protection device, particularly relates to the technical field of system fault measurement, and is used for solving the problem of insufficient positioning precision caused by neglecting the nonlinear characteristic of a fault point arc channel in an existing fault positioning method. A specific frequency current signal is injected into a fault phase, the phase relation between fundamental wave and harmonic wave components in current collected by a line protection device is analyzed to obtain a phase coherence coefficient, a fault line distribution parameter model is established to obtain theoretical reference information, and a spatial gradient sequence is generated by calculating actual measurement and theoretical spatial entropy values. Identifying a line section corresponding to the abnormal abrupt change point, and finally determining a grounding fault point according to the spatial position of the line section with significant difference. The method can effectively overcome the influence of nonlinear attenuation and frequency dispersion effect on the positioning precision, and achieves the precise measurement and positioning of a single-phase grounding fault.

The invention discloses a ground fault simulation method under different scenes based on an RTDS platform, and aims to solve the problem that in the prior art, systematic deviation exists between simulation waveforms and a physical true model test on key transient characteristics due to isolated modeling of fault influence factors. According to the method, a high-fidelity simulation model fusing multi-dimensional fault variables and a dynamic coupling mechanism of the multi-dimensional fault variables is constructed on an RTDS platform, and multiple variables such as multiple grounding modes of a neutral point, fault positions, phases, transition resistance, three-phase unbalance degree, PT disconnection and in-phase two-point grounding are covered; and fault waveform output and multi-terminal collaborative closed-loop test which are highly consistent with that of a real-type test under full frequency bands and full working conditions are realized.

A non-isolated bidirectional high-voltage direct current battery charger is made compatible with a ground-fault circuit interrupter (GFCI) at the DC output by adapting the power converter to control, in response to voltage or current sensors, a net current difference between forward current and return current to remain below a threshold of the GFCI. This can be done without compromising safety in the case of actual ground faults.

The invention provides a power distribution network single-phase earth fault processing and fault rapid regional isolation system for solving the problems existing in power distribution network single-phase earth fault regional isolation at present. The system is composed of an improved compensation damping type active intervention arc extinguishing device installed on a transformer substation bus, primary and secondary fusion intelligent switches installed at all nodes of a distribution line, and a primary and secondary fusion intelligent switch intelligent control terminal. When a single-phase grounding fault occurs, a grounding switch of the compensation damping type active intervention arc extinguishing device is switched on, a primary and secondary fusion intelligent switch control terminal of each node of a power grid generates corresponding low-resistance, medium-resistance and high-resistance zero-sequence protection fixed values, and when the single-phase grounding fault occurs, zero-sequence current protection is started to realize rapid fault area isolation of the single-phase grounding fault.

The invention relates to the technical field of power distribution automation, in particular to an FTU local grounding fault judgment method and system. The method comprises the following steps: collecting a zero-sequence current signal I0 and a zero-sequence voltage signal U0 of the FTU as fault signals; key features of the fault signals are extracted to form feature vectors, and the feature vectors are matched with a dynamic feature library; on the basis of a matching result, calculating corresponding confidence coefficients through a transient state main criterion and a steady state auxiliary criterion; and fusing the confidence coefficients of the transient state main criterion and the steady state auxiliary criterion, judging whether a grounding fault occurs according to a fusion result, and if the grounding fault is judged to occur, triggering a fault processing action and updating the dynamic feature library. According to the method, the problems of poor feature library adaptation, high probability of false judgment and missed judgment due to single criterion and slow response depending on a master station caused by limited storage computing power of the existing FTU can be solved, and local efficient and accurate fault judgment is realized.

The invention relates to the technical field of power equipment fault diagnosis, in particular to a fault detection method for a cable branch box, and aims to solve the problem that in the prior art, when a power distribution network cable branch box operates in an underground humid and multi-loop load fluctuation environment, the fault of the cable branch box cannot be detected. And the problem of coupling risk of leakage to the ground of a protective layer or short circuit fault and loop overcurrent, short circuit and fuse fault is generally faced. According to the invention, by synchronously acquiring loop and sheath parameters and establishing a collaborative diagnosis mechanism, collaborative detection of sheath grounding faults and loop faults can be realized, early insulation aging hidden dangers are effectively identified, a fault coupling relationship is accurately judged, and the method has the advantage of remarkably improving timeliness and accuracy of fault diagnosis.

An electrical wiring device including: a plurality of line terminals comprising a line-side phase terminal and a line-side neutral terminal; a plurality of load terminals comprising a load-side phase terminal and a load-side neutral terminal; a line conductor electrically coupling the line-side phase terminal to the load-side phase terminal; a neutral conductor electrically coupling the line-side neutral terminal to the load-side neutral terminal; and a controller configured to trigger a trip mechanism to electrically decouple the at least one of the plurality of line terminals from at least one of the plurality of load terminals based, at least in part, on comparing a magnitude of the current differential to a threshold, wherein the threshold is a function of the frequency of the current differential.

The present disclosure relates to electrical wiring devices, specifically ground fault circuit interrupters (GFCIs) with integrated self-test and miswire detection capabilities. The device comprises line and load hot terminals, line and load neutral terminals, a differential transformer with a sense coil, a circuit interrupter, and a controller. The controller is configured to periodically initiate a simulated fault self-test, allowing the fault condition to persist in a non-trip test state and triggering the circuit interrupter only if a fault is not detected within a predetermined period. The controller also detects miswire conditions by monitoring power at the line hot terminal during trip events and maintains a miswire state in memory if improper wiring is detected.

The invention discloses a generator stator grounding fault active arc extinction method based on double-loop quasi-PR control, and the method comprises the following steps: S1, monitoring the fundamental wave zero-sequence voltage and third harmonic voltage of a neutral point and a generator end of a generator, and carrying out the fault phase selection and positioning when a single-phase stator grounding fault occurs; s2, according to a fault positioning result, calculating a fault winding potential Ef, and setting a negative value-Ef of the fault winding potential Ef as a neutral point target compensation voltage; s3, a cascaded H-bridge converter is adopted as a topological structure of the active regulation and control device, and a double-closed-loop control framework composed of a voltage outer loop and a current inner loop is established; s4, setting quasi-PR control units for the fundamental wave component and the third harmonic component in the voltage outer ring and the current inner ring respectively; and S5, controlling the cascaded H-bridge converter to output a compensation voltage consistent with the target compensation voltage-Ef, and injecting the compensation voltage into the neutral point of the generator. The voltage regulation and control precision and the arc suppression speed in the active arc suppression process of the generator can be improved, and the operation safety and reliability of the generator are improved.

The invention discloses a small current grounding system single-phase grounding fault line selection method and system based on wavelet packet decomposition and comprehensive criteria, and belongs to the technical field of power system relay protection and fault diagnosis. Comprising the following steps: signal acquisition and preprocessing: acquiring bus zero-sequence voltage and each outgoing line zero-sequence current signal, and carrying out filtering and normalization preprocessing on the signals to eliminate interference; performing wavelet packet multi-scale decomposition, selecting a wavelet as a primary function, and performing wavelet packet decomposition on the preprocessed zero-sequence current signals of each line to obtain decomposition coefficients of different frequency bands; selecting characteristic frequency bands, calculating signal energy of each frequency band after each line is decomposed, and selecting the frequency band with the maximum signal energy; constructing a comprehensive criterion, wherein the comprehensive criterion comprises a polarity criterion and an amplitude criterion; and fault line discrimination: comparing the polarity criterion of each line with the bus voltage polarity, and finding out the line with opposite polarity and the most significant amplitude, namely the fault line. And the line selection accuracy and reliability under complex conditions are improved.

The embodiment of the invention discloses a power grid grounding fault positioning method and device, electronic equipment and a readable medium. A specific embodiment of the method comprises the following steps: for each monitoring line in each monitoring line, collecting monitoring data of the monitoring line; signal enhancement processing is carried out on electrical quantity data included in each piece of monitoring data in the collected monitoring data, so that the monitoring data are updated, and updated enhanced monitoring data are obtained; inputting the obtained enhanced monitoring data into a pre-trained ground fault positioning prediction model to generate ground fault positioning prediction information; acquiring a topological relation graph corresponding to a preset power grid; based on the grounding fault positioning prediction information and the topological relation graph, generating each tripping node identifier; and sending a tripping signal to each section switch corresponding to each tripping node identifier in a preset power grid so as to control each section switch to be switched off. According to the embodiment, the stability and safety of the power grid are improved.

The utility model provides a high-frequency anti-interference ground fault circuit interrupter and a GFCI circuit, which have an end-of-life self-checking function and comprise a high-frequency GFCI. The high frequency GFCI includes a circuit breaker and a relay circuit for controlling the circuit breaker. The high-frequency GFCI further comprises a fault detection circuit and a latch circuit. The utility model also provides an isolation circuit used for isolating the latch circuit and the fault detection circuit during a self-test period. And the self-checking circuit is used for testing the latch circuit and the fault detection circuit. An end-of-life circuit is also provided for disabling the high frequency GFCI when a self-test fails.

The invention provides a high-voltage cable sheath grounding fault diagnosis method and device and electronic equipment, and relates to the technical field of electrical fault diagnosis and detection. The method comprises the following steps: acquiring a multi-source state parameter, wherein the multi-source state parameter is used for representing a real-time operation state of a sheath grounding system corresponding to a high-voltage cable sheath; performing multi-source heterogeneous data processing on the multi-source state parameter to obtain a fundamental component and a harmonic component of the sheath current and a vibration energy value of the cable joint; determining a current fault type based on the multi-source state parameter, the fundamental component, the harmonic component and the vibration energy value; determining fault section position information based on the multi-source state parameters and the electric power topological graph of the high-voltage cable sheath; and determining a fault diagnosis result based on the current fault type and the fault section position information. The fault diagnosis method and device are used for improving the comprehensiveness and accuracy of fault diagnosis, reducing the possibility of misjudgment and missed judgment, and being convenient for maintenance personnel to quickly position and solve the fault problem so as to guarantee stable operation of a power system.

The invention discloses a method for searching a ground fault point of a low-voltage cable by using a safe direct-current power supply, which is suitable for searching the ground fault point of the low-voltage cable of a preset street lamp along the street, comprises a plurality of lamp poles which are distributed at intervals, and is characterized in that a PE (Poly Ethylene) wire of the low-voltage cable is connected with a ground terminal of a control cabinet; a positive wire outlet end provided with a safe direct-current power supply is connected with a direct-current 0.5 A fuse in series, the other end of the fuse is respectively clamped on A, B, C and N phases of a cable, a negative wire outlet end is connected with an mA meter in series, the other end of the mA meter is clamped on a cable head of a PE (Poly Ethylene) wire, when a certain phase of cable is grounded and short-circuited, the mA meter is equivalent to a grounding resistor which is connected in series in a loop, and the direct current of the loop is measured, so that the grounding short circuit of the cable is measured. And searching positions of a fault phase and a ground fault point. The invention discloses a method for safely, quickly and reliably searching a grounding fault point of a low-voltage cable.

The embodiment of the invention provides a single-phase earth fault positioning method and system for distributed power supply access, and belongs to the technical field of fault positioning. The single-phase earth fault positioning method comprises the following steps: acquiring a transient zero-sequence current signal of each measurement point when a power distribution network has a single-phase earth fault; preprocessing the transient zero-sequence current signal to obtain a corresponding transient characteristic; and positioning the fault section according to the transient characteristics. When the single-phase earth fault occurs in the power distribution network, each measurement point in the power distribution network collects the corresponding transient zero-sequence current signal, then the transient zero-sequence current signal is preprocessed to obtain the transient characteristic corresponding to each measurement point, and the fault section of the fault point can be accurately positioned according to the multiple transient characteristics, so that the accuracy of the single-phase earth fault is improved, and the accuracy of the single-phase earth fault is improved. Therefore, the precision and reliability of positioning the single-phase earth fault point when the distributed power supply is connected to the power distribution network are improved, and the reliability of the operation of the power distribution network is also ensured.

The invention provides an arc suppression coil grounding system zero-sequence overcurrent protection method based on zero-sequence voltage verification. The protection reliability is improved through multi-criterion fusion. The method specifically comprises the following steps: S1, arc suppression coil system fault starting criterion: monitoring a zero sequence voltage in real time, and triggering a protection algorithm when the amplitude of the zero sequence voltage exceeds a preset threshold value; s2, fault time calculation: calculating the duration time of a grounding fault based on the duration characteristic of the zero-sequence voltage; s3, fault position discrimination: in combination with the amplitude characteristics of the zero-sequence current, distinguishing an internal fault from an external fault; and S4, intelligent comprehensive decision making: fusing the transient and steady state characteristic quantities of the zero-sequence voltage and the zero-sequence current, and generating a protection action signal. According to the invention, by dynamically checking the correlation characteristics of the zero-sequence voltage and current, the problems of insufficient sensitivity and high maloperation rate of the traditional zero-sequence overcurrent protection in the arc suppression coil grounding system are effectively solved.

The invention discloses a multi-machine common-bus system grounding fault arc extinction and property identification method based on machine end voltage regulation and control. The method comprises the following steps: S1, machine end arc extinction; s2, low-frequency injection; s3, low-frequency component measurement; s4, grounding transition resistance calculation: through the low-frequency components of the terminal voltage and the current of each generator at the first moment, calculating the ground impedance Zi1 during a grounding fault; calculating the ground impedance Zi2 after the fault is stable through the low-frequency components of the terminal voltage and the current at the second moment; calculating the grounding transition resistance Rgi of each generator when any generator fails by integrating the Zi1 and the Zi2; s5, fault identification: if Rgi is greater than or equal to a set threshold value, identifying the fault as an instantaneous fault, and if Rgi is less than the set threshold value, identifying the fault as a permanent fault; if a generator is identified as a permanent fault, the generator can be identified as a fault unit. According to the method, the problem of poor economical efficiency of existing fault arc extinction and fault identification in a multi-machine common-mother system can be solved.

The embodiment of the invention provides a high-resistance grounding fault detection method and device, and the method comprises the steps: collecting the three-phase current of a preset monitoring point in real time, and enabling the preset monitoring point to be disposed at an incoming line of a multi-feeder line of a transformer substation; and according to the three-phase current and the three-phase current of the previous period, determining a three-phase current abrupt change composite quantity which represents the variable quantity of the unbalance degree of the three-phase current, and if the three-phase current abrupt change composite quantity is greater than a first preset threshold value, judging to start fault judgment. When fault judgment is started, whether a single-phase earth fault occurs in the multi-feeder line of the transformer substation or not is recognized according to the amplitude relation and / or the phase relation among the three-phase phase current break variables, and the three-phase phase current break variables represent the instantaneous variation of each phase current between adjacent periods. The method can effectively solve the problem that when the method is applied to a high-resistance grounding fault in a neutral point small-resistance grounding system, the detection precision is low due to the fact that the fault current is far lower than a conventional protection threshold value and other factors.

The invention discloses a neutral point ungrounded fault positioning device and method based on dynamic time window inversion, and belongs to the technical field of new energy power system fault detection. Aiming at the problems that most of the existing methods depend on single signal characteristics or fixed window length analysis and are difficult to adapt to time-varying characteristics and complexity of a fault transient process in a new energy current collection line, a sensor is used for sensing current generated between a transformer shell and a grounding point when a fault occurs, and dynamic time window selection and an integral inversion algorithm are combined, so that the time-varying characteristics of the fault transient process in the new energy current collection line are obtained. Processing and feature extraction are carried out on the voltage value, self-adaptive analysis of the fault transient waveform of the neutral ungrounded system is achieved, and fault features are accurately extracted. According to the method, the problems of fixed time window and insufficient feature extraction capability of a traditional method are solved, and the system fault positioning speed and precision are improved. In addition, the method can also realize real-time monitoring, fault positioning and data acquisition and storage of fault current, thereby improving the stability and operation and maintenance efficiency of the power system.

The invention provides a high-resistance grounding fault detection method, device and equipment and a storage medium, and the method comprises the steps: collecting a three-phase current and voltage signal of a small-resistance grounding system, and carrying out the processing of the three-phase current and voltage signal to obtain a zero-sequence current and a zero-sequence voltage; when the zero-sequence voltage energy characteristic meets a preset condition, calculating fault grounding resistance according to the zero-sequence current, the zero-sequence voltage and system electrical parameters; calculating a transient zero-sequence current characteristic value and a steady-state zero-sequence voltage characteristic value according to the fault grounding resistance, and comparing the characteristic values with a threshold value; and when the two characteristic values are both smaller than the corresponding threshold values, determining that the fault is a high-resistance grounding fault. According to the method, the fault grounding resistance is calculated, the transient state and steady state characteristic criteria are deduced based on the resistance, and the detection basis is converted from direct measurement of the fault current to analysis of the fault resistance characteristics, so that accurate identification of the low-current high-resistance grounding fault which is difficult to detect by a traditional method is realized.

A ground fault circuit interrupter (GFCI) device includes a ground fault detection module for detecting a ground fault in a neutral line of a plurality of current carrying lines and generating a ground fault signal in response thereto, including a neutral line detection coil having a magnetic core made of a silicon steel and through which the current carrying lines pass; a leakage current detection module for detecting the ground fault signal and detecting a leakage current signal on the current carrying lines, and generating a zero sequence current fault signal in response to either signal; and a drive module for receiving the zero sequence current fault signal and driving a switch module to disconnect the electrical connection of the current carrying lines in response thereto. The GFCI device can avoid false tripping when high frequency currents flow through the current carrying lines, improving user experience and enhancing safety.

The invention discloses a transformer substation transformer core grounding fault detection method, and belongs to the technical field of transformer fault monitoring, and the method comprises the following steps: S1, collecting feature data of transformer core grounding fault diagnosis, preprocessing the feature data, and building a fault feature set; s2, establishing a training set and a verification set according to the fault feature set, inputting the training set and the verification set into a support vector machine, and establishing a fault diagnosis model; and S3, collecting characteristic data of transformer iron core grounding fault diagnosis, and inputting the characteristic data into the fault diagnosis model to obtain an iron core grounding fault diagnosis result. According to the method, grounding iron core fault diagnosis is jointly applied by adopting multiple indexes, the improved SSA algorithm is combined to optimize the support vector machine to establish the fault diagnosis model, differences of gas components, high-frequency current and partial discharge generated by different faults are analyzed, the fault positioning accuracy and diagnosis efficiency can be greatly improved, and the fault diagnosis accuracy is improved. The problem that a traditional diagnosis method is low in iron core grounding fault detection efficiency is solved.

A method, electronic device, and readable storage medium for rapid optimization of neutral bus arrester parameters are disclosed. Based on the main circuit topology of a symmetrical bipolar flexible DC system composed of a half-bridge submodule MMC converter, the method establishes equivalent circuits for different fault conditions, including DC pole-to-ground faults, single-phase-to-ground faults in the valve-side windings connected to the transformer delta connection, and neutral line open-circuit faults. It obtains the energy absorbed by the neutral bus arrester and, based on the relationship between the energy absorbed by the neutral bus arrester and its protection level, optimizes the energy absorption of the arrester under different fault conditions with the goal of balancing the energy absorbed. This allows for rapid optimization of the neutral bus arrester parameters, offering advantages of speed, economy, and efficiency.