247 results about "Recloser" patented technology

The invention discloses a primary and secondary fusion pole-mounted intelligent circuit breaker. The primary and secondary fusion pole-mounted intelligent circuit breaker comprises a fault detection module, a protection action module, a reclosing module and an information reporting module, the fault detection module collects multi-dimensional electrical quantity through a current transformer and a voltage transformer, and judges a fault and identifies the type in combination with a dynamic normal range and a duration threshold. The protection action module calculates the fault distance based on the correction impedance, judges whether to act or not by combining the current flow direction and the protection range, and selects a protection level according to the fault severity; the reclosing module dynamically sets an observation time window, distinguishes instantaneous or permanent faults through a retest verification mechanism, and adaptively adjusts a reclosing strategy; and the information reporting module uploads fault related information. According to the method, the problems of high misjudgment rate, poor protection selectivity, rigid reclosing logic and the like of a traditional circuit breaker are solved, and the accuracy, quickness and self-healing capability of power distribution network fault processing are remarkably improved.

The invention discloses a reclosing locking method and system based on winding hot-spot temperature fitting, and relates to the technical field of power transformer dynamic stability assessment, and the method comprises the steps: determining a target transformer, collecting parameters, building a winding current calculation model, calculating steady-state and short-circuit current waveforms, and carrying out the winding temperature rise test of the transformer, the method comprises the following steps: measuring a steady-state temperature rise value, constructing and correcting an electromagnetic heat flow coupling model, generating steady-state and transient-state temperature field data of a winding, constructing a target function of a winding hot-spot temperature, fitting simulation data by utilizing an optimization algorithm, obtaining a fitting function, calculating a winding stress value under a short-circuit working condition in real time, and comparing the winding stress value with a dynamically adjusted stress limit value, so as to obtain a winding stress value. Alarm and locking reclosing are triggered according to the result, and intelligent protection of the transformer is achieved. According to the invention, through accurate parameter acquisition, model establishment, temperature field simulation, hot-spot temperature fitting and stress calculation, real-time monitoring and intelligent protection of the transformer winding under the short-circuit working condition are realized.

The invention relates to the technical field of circuit breakers, in particular to a circuit breaker with a reclosing mechanism, which comprises a shell, a circuit breaker handle is rotationally arranged in the shell, an operating rod and at least three gears meshed in sequence are further rotationally arranged in the shell, and the tooth number of each gear is gradually increased in sequence. The two gears located on the two sides are a small gear and a large gear respectively, the number of teeth of the small gear is smaller than the number of teeth of the large gear, the operating rod is fixedly connected with the small gear, and the large gear is in transmission connection with a circuit breaker handle. Speed reduction and torque increase are realized through the gear train, so that the force required to be applied when a user manually operates the handle of the circuit breaker is remarkably reduced, the operation intensity is reduced, the convenience of manual reclosing is improved, and the manual reclosing device is particularly suitable for a large-current circuit breaker or an occasion requiring a relatively large operation torque.

The invention discloses a reclosing coordination control method and system based on electrical parameter measurement, particularly relates to the technical field of intelligent power grid fault processing and security defense, and is used for solving the problem that the reliability of fault judgment is reduced due to the fact that high-proportion distributed photovoltaic is connected to a power distribution network. A harmonic detection signal is injected during a reclosing waiting period, a response signal is measured, harmonic subspace energy distribution is extracted, an energy distribution matrix is constructed to calculate a nuclear norm change rate and form similarity, a system harmonic impedance stable state is judged through double verification, and finally a reclosing decision is executed according to a fault judgment parameter. The method can accurately identify the convergence characteristic of the dynamic process of the system, effectively distinguish the instantaneous fault from the permanent fault, and significantly improve the reclosing success rate and the power supply reliability of the distributed photovoltaic power distribution network.

The invention discloses a photovoltaic power grid fault transient control method, device and equipment, and relates to the technical field of photovoltaic auxiliary equipment, and the method comprises the following steps: obtaining the operation data of a photovoltaic grid-connected point, constructing a three-phase coupling characteristic matrix, and generating a disturbance discrimination result according to the dynamic evolution of the three-phase coupling characteristic matrix; based on a disturbance judgment result, collecting three-phase output current of the photovoltaic inverter, calculating disturbance increment of each phase of current, extracting a stable current component during a fault period based on low-voltage ride-through control logic, and calculating equivalent support power of the stable current component at a fault point; the equivalent support power is compared with a preset arc extinguishing threshold value, and the dissociation condition of the fault point is dynamically evaluated; when the fault point is not free, the photovoltaic inverter is controlled to perform state conversion, so that the equivalent support power is lower than an arc extinguishing threshold value; and after detecting that the voltage of the fault point is recovered and the arc light is extinguished, dynamically adjusting the reclosing time sequence based on the voltage recovery rate. The problems that arc light is difficult to extinguish and the reclosing failure rate is high are solved.

The invention discloses a dual-stage distribution network fault recovery control method based on energy storage active variable power. In the first stage, energy storage maintains network construction type control, the sum of relative entropies of circuit breaker downstream positive sequence voltages in a reference time window and a detection time window is calculated in real time within the detection duration, if the sum of the relative entropies is larger than or equal to a voltage relative entropy threshold value, it is indicated that a fault is removed, and reclosing is delayed; if the sum of the relative entropies is continuously smaller than the voltage relative entropy threshold value, it is indicated that whether the fault is removed or not is not detected, and the second stage is started; in the second stage, variable power control is adopted for energy storage, the sum of relative entropies of the downstream positive sequence voltage of the circuit breaker in the reference time window and the detection time window is calculated in real time within the detection duration, and if the sum of the relative entropies is larger than or equal to the voltage relative entropy threshold value, time delay reclosing is conducted; and if the sum of the relative entropy is continuously smaller than the voltage relative entropy threshold value, the reclosing is locked. And rapid fault recovery can be realized, and secondary impact on the system possibly caused by blind switching of reclosure is avoided.

A three-phase adaptive reclosing method and system for wind farm transmission lines based on parallel reactor current is provided. When a phase to phase or three-phase fault occurs in the transmission line, the circuit breakers at both ends trip. The current transformer is used to sample the three-phase current signal of the parallel reactor, calculate the differential mode current of the parallel reactor, and perform zero crossing detection to construct a fault nature identification criterion. The fault nature is determined within the maximum discrimination time limit combined with the sliding time window. For permanent faults, the reclosing device is locked; for transient faults, calculate the time when the fault disappears and determine the reclosing time, and open the reclosing device. The method and system identifies the nature of faults by detecting whether the differential current of parallel reactors crosses the zero axis, with low sampling rate requirements, and small errors.

The invention discloses an intelligent opening and closing method and system for a reclosing circuit breaker based on an electromagnet, and relates to the field of intelligent control, and the method comprises the steps: monitoring a line current in real time, comparing the line current with a preset threshold value, and carrying out the opening after the overcurrent abnormality is detected. Entering a first time delay stage after opening, comprehensively evaluating the states of the circuit breaker and the circuit, and constructing a dynamic weight index system to calculate an evaluation score; if the score exceeds a threshold value, closing is carried out after time delay is finished, otherwise, an alarm is triggered. And entering a second delay stage after switching on, continuously monitoring the electric parameters and establishing an anomaly judgment mechanism, forming a closed-loop protection process of monitoring, switching off, evaluating, switching on and re-monitoring, and realizing intelligent linkage of overcurrent protection and state self-adaption. The method has the advantages that through real-time line electric parameter monitoring, multi-dimensional state evaluation and an intelligent decision-making mechanism, precise opening and closing of the circuit breaker are achieved, the power supply reliability is improved, the power failure time is shortened, and the misoperation risk is reduced.

The invention relates to the technical field of automatic control, and discloses a magnetic recloser adaptive control method and system for circuit design. The method comprises the steps of collecting multi-dimensional electrical parameters of a distribution line through an intelligent sensor array, constructing a mixed fault feature vector by utilizing a time-frequency domain fusion algorithm, separating instantaneous and permanent fault components by adopting three-stage fault recognition, obtaining fault severity level evaluation based on dynamic weight distribution, and performing fault severity level evaluation based on dynamic weight distribution. And generating a self-adaptive control instruction through grading reclosing strategy matching to execute the opening and closing operation of the magnetic recloser. According to the invention, the technical problem that the magnetic recloser cannot carry out accurate fault recognition and adaptive hierarchical control in a multi-transient fault and permanent fault mixed scene is solved.

A high-efficiency power electronic voltage regulating device with a reclosing function is connected in series with a low-voltage line and comprises a silicon controlled bypass switch, a series power unit, a parallel power unit, an input filtering unit, an output filtering unit, a controller, a topology change-over switch, a mechanical bypass switch, an input switch, an output switch and the like. Under a normal working condition, power is supplied to a user through the silicon controlled bypass switch; through an AI pre-judgment technology, a power grid voltage drop or increase trend is pre-judged, and a series power unit is conducted in advance; a topology change-over switch is connected to form a boost or buck topology, and when the voltage of a power grid is too low or too high, the normal voltage of a user is ensured through PR closed-loop control; when the rear-end line / load breaks down, reclosing control is carried out; and voltage upper and lower limits are adjusted remotely. The device utilizes the AI pre-judgment technology, has the characteristics of stable voltage, no need of input / output commutation and the like, solves the problems of over-high and over-low voltage and automatic reclosing in fault, and improves the high power supply quality and the power supply reliability of users.

The invention relates to the technical field of circuit breakers, and discloses a switching-on and switching-off structure of a reclosing circuit breaker, which comprises a shell, a static contact, a moving contact, a switching-on and switching-off knife switch and a switching-on assembly, and the static contact and the moving contact are arranged in the shell. The closing assembly comprises a driving motor and a transmission part arranged between the opening and closing knife switch and an output shaft of the driving motor, the driving motor can drive the transmission part to act, and the transmission part can drive the opening and closing knife switch to act. When an instantaneous fault of a circuit where the circuit breaker is located disappears, the driving motor drives the transmission part to act and further drives the opening and closing knife switch to act, direct driving of a power source is achieved, the mechanical structure is simplified, the fault probability caused by complex mechanical interlocking and lock catch abrasion and jamming is reduced, the mechanical response time is shortened, and the service life of the circuit breaker is prolonged. And the execution speed of the automatic reclosing is improved, so that the intelligent power grid can recover power supply more quickly.

The invention discloses an overhead line fault diagnosis method, system and device based on space vector conversion and a storage medium, and relates to the technical field of intelligent power distribution, and the method comprises the steps: collecting the normal operation three-phase current data of an overhead power distribution line, and constructing a steady-state feature model; three-phase current data is collected in real time and converted into a space vector sequence, the Euclidean distance between a vector end point and a model center is calculated, and instantaneous offset is extracted. Integrating the offset in a sliding window, calculating a phase rotation rate, generating a multi-dimensional deviation tensor, inputting the multi-dimensional deviation tensor into a fusion function to obtain a misconstruction score, and normalizing the misconstruction score to obtain a misconstruction index; comparing the index with a threshold value, if the index exceeds the threshold value, determining that the disturbance is external transient disturbance, and adjusting the sampling frequency of the current sampling device; according to the method, interference can be effectively identified in a special electromagnetic environment, misjudgment of diagnosis is avoided, maloperation of a protection device is reduced, reclosing operation is guaranteed, and the fault diagnosis accuracy and robustness of a power distribution system are improved.

The invention relates to a coupled inductor current-limiting type hybrid direct-current circuit breaker topology and a working method. The coupled inductor current-limiting type hybrid direct-current circuit breaker comprises a current-carrying part and a breaking part, the current-carrying part is formed by connecting an ultra-fast mechanical switch UFD and a load change-over switch LCS in series, the breaking part comprises a bridge circuit, a first branch circuit, a second branch circuit, a third branch circuit, a fourth branch circuit, a fifth branch circuit and a sixth branch circuit, the fourth branch circuit is formed by connecting a thyristor, a coupling inductor and a primary side inductor in series to form a current-limiting branch circuit, and the fifth branch circuit is formed by connecting a secondary side inductor and a secondary side inductor. The sixth branch is formed by connecting a secondary side inductor of a coupling inductor with a thyristor in series and then connecting the secondary side inductor with a capacitor in parallel; the current limiting of the fault current is realized through the fourth branch, the fault breaking of the primary side inductor of the coupling inductor of the fourth branch is completed through the coupling effect of the secondary side inductor of the coupling inductor of the sixth branch, the peak value of the fault current is obviously reduced, and the breaking time is obviously shortened; the circuit breaker can quickly respond to faults of three working modes of current limiting breaking, reclosing and small current breaking; and the breaking part of the circuit breaker adopts the thyristors instead of the IGBTs, so that the cost of the circuit breaker is reduced.

The invention provides an intelligent reclosing method and device for a new energy power distribution network. The method comprises the steps that after the power distribution network breaks down, an energy storage power station is connected into the power distribution network, and back electromotive force active arc extinction control is carried out; after it is detected that the fault arc is extinguished, the energy storage power station serves as a main power supply to continuously supply power to a downstream load of the power distribution network; and if the operation mode is a network construction type operation mode, determining a delay duration based on a first reclosing starting threshold value, and carrying out a delay reclosing operation, and if the operation mode is a current limiting operation mode, determining a delay duration based on a second reclosing starting threshold value, and carrying out a delay reclosing operation. According to the method, the fault state can be accurately identified in the complex environment of high-proportion distributed new energy and energy storage access, secondary impact caused by blind switching-on is avoided, meanwhile, rapid recovery of power supply and safety and stability of the system are considered, and efficient, safe and economical operation of the new energy power distribution network is effectively guaranteed.

The invention relates to the technical field of circuit breakers, in particular to a double-connecting-rod reclosing mechanism and a circuit breaker, and the double-connecting-rod reclosing mechanism comprises a driving assembly, a rotating part, a first connecting rod, a second connecting rod, a fixed plate and a sliding block, the driving assembly is used for driving the rotating part to rotate, and the first connecting rod comprises a connecting end and a transmission end; the connecting end is eccentrically and rotationally connected to the rotating piece, the transmission end is rotationally connected with the second connecting rod, the fixing plate and the sliding block are both located on one side of the rotating piece, the sliding block can slide in the direction close to or away from the rotating piece and is used for driving a circuit breaker handle to rotate, a chute is formed in the fixing plate, and the sliding block can slide in the chute in the direction close to or away from the rotating piece. The second connecting rod comprises a sliding end and a rotating end, the sliding end slides along the inclined groove, the rotating end is rotationally connected with the sliding block, and the transmission end is located between the sliding end and the rotating end.

This invention relates to the field of DC circuit breakers, and discloses a thyristor-type DC circuit breaker and its control method. The DC circuit breaker structure is a thyristor T... m1 Anode-connected thyristor T m2 The cathode forms the A terminal of the circuit breaker, T m1 Cathode connection T m2 The anode of the thyristor forms the B terminal of the circuit breaker; the thyristor T p1 anode, thyristor T p2 The cathode is connected to terminal A; T p1 Cathode connection T p2 After anode, it passes through resistor R in sequence. g Switch RCB g Grounding; T p1 Cathode connection T p2 After the anode, it also passes through inductor L p Capacitor C is connected to terminal B; one end of the surge arrester MOV is connected to terminal T. p1 The cathode is connected to the first terminal, and the other end is connected to the B terminal. This invention has a simple structure and significant cost advantages; under normal operating conditions, only a single thyristor is conducting, resulting in extremely low losses and extremely high circuit breaker efficiency. Combined with control methods, it can actively and reliably connect or disconnect bidirectional operating current or bidirectional fault current; it can also achieve fast reclosing functionality.

A recloser pole convenient to overhaul is characterized in that the recloser pole comprises a packaging shell, a detachable upper wire inlet mechanism connected to the packaging shell, a detachable lower wire outlet mechanism connected to the packaging shell and electric display sensing parts embedded in the upper wire inlet mechanism and the lower wire outlet mechanism, and an upper connector and a lower connector are arranged on the packaging shell; clamping grooves are evenly distributed in the outer side wall of the upper connector and the outer side wall of the lower connector respectively, the upper wire inlet mechanism is matched with the upper connector, and the upper connector is sleeved with the upper wire inlet mechanism. The upper wire inlet mechanism comprises an upper wire inlet connector, an upper wire inlet connector base connected to the upper wire inlet connector, an outer ring wrapping the upper wire inlet connector base and an elastic clamping piece clamped between the upper wire inlet connector base and the outer ring, and the elastic clamping piece abuts against the clamping groove. The lower wire outlet mechanism is matched with the lower connector, and the lower wire outlet mechanism is arranged outside the lower connector in a sleeving mode, so that when the wiring end of the recloser has circuit problems such as virtual connection, the maintenance efficiency of workers is effectively improved, and the maintenance convenience is effectively improved.

The utility model provides a transmission mechanism and a reclosing circuit breaker, and belongs to the technical field of electrical equipment. The transmission mechanism comprises a handle, a driving disc, a connecting rod and a limiting shaft. The handle is provided with a push block, the push block is provided with a mounting groove and a limiting hole, and the limiting hole is communicated with the mounting groove. The connecting rod comprises a first end and a second end which are opposite in position, the first end is provided with a first mounting hole, the second end is provided with a second mounting hole, the second end is located in the mounting groove, and the second mounting hole is opposite to the limiting hole in position. The driving disc is arranged on one side of the handle, and a driving shaft is arranged on the surface of the driving disc. And the driving shaft penetrates through the first mounting hole. The limiting shaft penetrates through the limiting hole and the second mounting hole to limit the second end. When the driving disc rotates, the driving shaft can drive the connecting rod to move, and when the connecting rod moves, the pushing block can be driven to swing between the first position and the second position. According to the transmission mechanism, the connecting mode between the structural parts is simple, use of bolts is reduced, and the production cost and the maintenance cost of the transmission mechanism are reduced.

A dropout recloser is capable of in accordance with its operating programming after a predetermined number of fault interrupting operations, e.g., 1, 2, 3 or more but typically 3, to drop out of a cutout and hang freely in a hinge contact of the cutout providing sectionalization with an observable visible gap. The recloser includes fault interrupting and reclosing components, a drop out mechanism and a controller. The drop out mechanism may include a bi-stable actuator to affect fault interrupting operation and dropout operation. The device may include motion limiting structures. The recloser may have a number of operating modes or sequences.

The utility model relates to a remote control circuit structure based on reclosing. The remote control circuit structure comprises a power supply module, a main control module, a motor module, a Hall module, a communication module and an indicating lamp module, the objective of the utility model is to remotely send motor positive and negative rotation instructions to the master control module through the communication module, the motor controls the reclosure to carry out opening or closing operation, and when the reclosure is in an opening or closing state, the Hall sensor at the corresponding position detects a signal tooth, and the signal tooth is switched on. The main control module provides a reclosing opening or closing in-place signal, the motor module controls the motor to stop working, and an opening or closing signal lamp corresponding to the indicating lamp module is turned on, so that the requirement of remotely controlling the reclosing switch is met.

The invention discloses a flexible DC power transmission line adaptive reclosing method based on coupling voltage analysis, and the method comprises the steps: collecting a coupling voltage signal of a non-fault pole after determining that a single-pole grounding fault occurs in a flexible DC power transmission line and a fault line is removed; adopting a CEEMDAN algorithm to extract a residual term component of the signal; carrying out linear fitting on the residual term component and calculating an included angle characteristic quantity; whether the included angle characteristic quantity meets a preset included angle condition or not is judged, if yes, it is judged that the single-pole grounding fault is an instantaneous fault, and the circuit breaker is controlled to execute reclosing operation to restore power supply; and if not, determining that the single-pole grounding fault is a permanent fault, and locking and reclosing. According to the method, the dynamic trend characteristics of the coupling voltage after the fault are analyzed and the included angle criterion is constructed, so that the technical problems of insufficient quick action, poor anti-interference capability and easiness in causing secondary impact of an existing self-adaptive reclosing method in single-pole grounding fault property judgment are solved.

The invention provides a thyristor-based complementary commutation type solid-state DC circuit breaker and a control method thereof. The thyristor-based complementary commutation type solid-state DC circuit breaker comprises a main branch and an auxiliary branch, the main branch comprises a thyristor and a thyristor which are reversely connected in series, the anodes of the thyristors in the auxiliary branch are connected, the cathodes of the thyristors in the auxiliary branch are connected with the anodes of the thyristors through resistors, the anodes of the thyristors in the auxiliary branch are connected with the cathodes of the thyristors in the auxiliary branch, the cathodes of the thyristors in the auxiliary branch are connected with the anodes of the thyristors through the resistors, and the cathodes of the thyristors are grounded through the resistors; the other ends of the positive electrodes are respectively connected with the positive electrodes, the negative electrodes are connected with the positive electrodes, and the negative electrodes are connected with the negative electrodes; the anodes of the diodes are connected, the cathodes of the diodes are connected with the other end of the capacitor C through the resistor, the anodes of the diodes are connected with the cathodes of the diodes, the cathodes of the diodes are connected with the other end of the capacitor C through the resistor, and the lightning arrester MOV is connected with the capacitor C in parallel. The device is low in conduction loss, is high in operation efficiency, can interrupt bidirectional operation current and fault current, is high in controllability and reliability, and has a reclosing function.

The invention discloses a rapid and reliable reclosing switch, relates to the technical field of vacuum circuit breakers, and aims to solve the problems that an existing vacuum circuit breaker is mainly driven by an electromagnetic operating mechanism to complete closing and opening actions, but the premise of realizing stable closing and opening by the electromagnetic operating mechanism is stable and continuous output of current, and the operation is inconvenient. In order to form a stable magnetic field to maintain switching-on and switching-off actions and solve the technical problem that when current fluctuates, a switch is prone to tripping without permission, the switch comprises symmetrically arranged bases, a U-shaped shell and a frame-shaped connecting piece are detachably connected between the bases, and an insulating substrate is detachably installed at the top of the inner wall of the U-shaped shell. Opening and closing switch assemblies are detachably installed at the bottom of the insulating substrate at equal intervals, an opening and closing indication assembly is fixedly arranged on one side of the bottom of the insulating substrate, and an opening handle assembly is movably installed in one side of the U-shaped shell. The invention has the advantage of improving the stability and reliability of closing.

The invention discloses a distribution network fault removal method, device and system, a storage medium and a product, relates to the technical field of distribution network line fault removal, and can be used for distribution network fault removal equipment of an electric power system, the electric power system further comprises a plurality of circuit breakers on a distribution line, and the plurality of circuit breakers are in communication connection with the distribution network fault removal equipment; the distribution network fault removal method comprises the following steps: monitoring opening events of a plurality of circuit breakers; the opening event comprises a fault tripping event generated by the circuit breaker aiming at a distribution network fault point; and for any circuit breaker, under the condition that the occurrence frequency of the opening event of the circuit breaker within the corresponding preset duration reaches a preset threshold value, controlling reclosing locking of the circuit breaker so as to cut off the permanent distribution network fault. According to the invention, repeated tripping and closing of the circuit breaker during permanent fault processing can be avoided, and oscillation of the distribution line is reduced.

The utility model belongs to the technical field of circuit breakers, in particular to a high-stability automatic reclosing lock, which comprises an upper cover, a middle cover and a base, the middle cover is provided with a motor; the side, close to the upper cover, of the motor is rotationally connected with a column body; a cam is clamped on the column body; a connecting rod pin is arranged at the edge of the cam; the connecting rod pin is connected with one side of the connecting rod; a groove is formed in one side, far away from the connecting rod pin, of the connecting rod; the middle cover is provided with a limiting groove below the connecting rod; a handle is rotatably connected in the limiting groove; a state indicating piece is inserted into the handle; a microswitch is arranged on one side of the state indicating piece; the motor, the cam, the handle and the connecting rod adopt a coaxial rotating structure to start opening, closing and tripping states, so that the problems that the output stroke of a transmission mechanism is too large, so that the transmission mechanism cannot be well linked and tripped, and the linkage device does not return to a specified position after tripping, so that the situation that the linkage device cannot be closed is avoided, the structure is simple, and the stability of a product is improved.

The invention provides a low-conduction-loss direct-current circuit breaker with a fault type judgment function and a judgment method, and belongs to the field of circuit fault detection. In order to solve the problems that in an existing hybrid high-voltage direct-current circuit breaker, the conduction loss of a load commutation switch is high, and a circuit device does not have the fault type discrimination capability, the direct-current circuit breaker comprises a load branch, a multifunctional branch, a main breaking branch and an energy absorption branch. The discrimination method comprises the following steps: in a normal operation mode, a load branch is conducted; the capacitor pre-charging mode operates in parallel to charge the capacitor C; when the circuit is short-circuited, a thyristor turn-off mode is entered, and the T1 is turned off; and entering a load commutation mode, converting the fault current to a main breaking branch, introducing an energy absorption branch, and entering an energy absorption mode. And injecting a controlled RLC oscillation current, analyzing current waveform characteristics to judge a direct current fault type, and performing reclosing or maintenance of the circuit breaker according to the analyzed direct current fault type.

The embodiment of the invention provides a circuit protection method and device, electronic equipment and a readable storage medium, and the method comprises the steps: obtaining historical load data and a current parameter of at least one protection terminal; determining a threshold value according to the historical load data; determining a protection judgment parameter corresponding to the protection terminal according to the threshold value and the current parameter; transmitting at least one protection judgment parameter between adjacent protection terminals; determining a difference value of protection judgment parameters between the first protection terminal and the second protection terminal; determining a fault section position corresponding to the protection terminal according to the difference value; controlling a protection terminal at a power supply side in two ends of the fault section to execute a three-phase tripping action of the circuit breaker; controlling the circuit breaker completing the three-phase tripping action to perform reclosing action; and determining a reclosing result of the reclosing action. According to the scheme of the invention, no power failure is caused in an instantaneous fault, and accurate and rapid on-site double-end isolation of a permanent fault is realized.

The invention discloses a self-adaptive reclosing control method and system for a distribution automation feeder terminal, and relates to the technical field of intelligent power distribution, and the method comprises the steps: carrying out the real-time monitoring of a distribution network line, obtaining a line monitoring sequence, synchronously obtaining a terminal state sequence, carrying out the abnormal interference correction of a terminal, and obtaining a line operation feature sequence; building a reclosing locking detection space, and inputting the line operation characteristic sequence into the reclosing locking detection space to obtain a reclosing locking coefficient; if the reclosing locking coefficient is smaller than the reclosing locking threshold value, multi-dimensional fault prediction is carried out on the distribution network line, a line fault feature graph is generated, protection tripping probability prediction is carried out on the distribution network line, and the line protection tripping probability is determined; and performing self-adaptive reclosing control by combining the line protection tripping probability and the feeder terminal. The technical problems that reclosing locking judgment is inaccurate and reclosing control lacks adaptivity in the prior art are solved, and the technical effect of improving reclosing action decision accuracy and reliability is achieved.

This invention discloses a recloser controller testing device in the field of recloser technology. It includes a testing mechanism for testing the recloser controller box, with test lines connected to the outside of the testing mechanism and aligned with the recloser controller box. It also includes a testing platform fixedly mounted on the testing mechanism. A display screen and a switch assembly are installed on the outside of the testing mechanism. A lifting frame for raising the recloser controller box is fixedly connected to the upper side of one side of the testing platform, while a second motor for driving the lifting frame is fixedly connected to the bottom of the testing platform. An adjusting frame is also fixedly connected to the bottom of the testing platform, with symmetrically mounted limiting plates on the upper end of the adjusting frame for clamping and fixing the recloser controller box. This invention, by setting up a dedicated testing platform for factory quality and functional testing of the recloser controller, has a simple and reasonable overall structure and is easy and convenient to operate, effectively meeting the production needs of recloser controllers.

The invention relates to the technical field of electrical automation control, and discloses a permanent magnet recloser controller for capacitor power taking and supplying and a circuit design method thereof. According to the permanent magnet recloser controller, a multi-stage capacitor electricity taking circuit controls a three-stage capacitor switching combination through an intelligent change-over switch; the self-adaptive current detection module generates a power prediction value by adopting a Hall sensor and a sliding window algorithm; the dynamic power management circuit comprises a switching power supply, a super capacitor and a lithium battery unit; the permanent magnetic mechanism driving circuit generates a pulse signal through an IGBT; and the intelligent reclosing control module performs differential control according to the fault characteristics. The problems that in the prior art, a permanent magnet recloser controller taking and supplying power through a capacitor is unstable in power supply under the variable load working condition, power management lacks self-adaptability, the driving reliability of a permanent magnet mechanism is poor, and a reclosing strategy is solidified are solved.