412 results about "Dc circuit breaker" patented technology

The invention relates to the technical field of power electronic devices, in particular to a low-voltage direct-current circuit breaker, a fault protection method and a related device.The low-voltage direct-current circuit breaker comprises a through-flow branch, a transfer branch and an energy consumption branch which are connected in sequence; the through-current branch comprises an isolating switch and an MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) commutation switch which are connected in series; the transfer branch comprises a first power electronic switch group and a buffer branch which are connected in parallel; the energy consumption branch comprises a first metal oxide MOV, a second metal oxide MOV and a second power electronic switch group; the first metal oxide MOV is connected in parallel with the second power electronic switch group; and the second metal oxide MOV is respectively connected with the first metal oxide MOV and the second power electronic switch group. The technical problems that an existing hybrid direct current circuit breaker is not suitable for a low-voltage direct current system and the loss is high in the turn-off process are solved.

The invention provides a control method and system for an energy storage PCS with an AC / DC circuit breaker and a storage medium, and the method comprises the steps: firstly, synchronously collecting the electrical parameters of a DC side and an AC side, and carrying out the preprocessing of the collected data, so as to form a standardized electrical matrix; then, all parameters in the electrical matrix are cyclically compared with corresponding early warning thresholds, first-level thresholds, second-level thresholds and fusing thresholds in a multi-level threshold mapping table; if the pre-warning threshold value is exceeded, a log is recorded, if the pre-warning threshold value is exceeded, self-healing operation is executed, if the pre-warning threshold value is exceeded, turn-off operation is executed, and if the pre-warning threshold value is reached, physical fusing is triggered; meanwhile, all operation logs are recorded, and the threshold mapping table is dynamically optimized by analyzing log data; according to the method, the fault response speed and the protection precision are improved through multi-level threshold serial comparison and a cooperative protection mechanism, the stability and the reliability under different working conditions are enhanced through the adaptive learning capability, and meanwhile, the whole life cycle cost is reduced.

The invention relates to an economical direct-current circuit breaker with zero-region rapid recovery capability and a control method. The circuit breaker solid state topology comprises a main through-flow branch, a resonance commutation loop, a damping energy consumption loop, a capacitor reset loop, a weak current breaking loop, a pre-charging branch and an MOV energy release module. When it is judged that the system has a short-circuit fault, fault current is introduced into a resonance commutation loop and a damping energy consumption loop, the short-circuit fault is rapidly removed, and safe opening time is provided for a vacuum switch of a main through-flow branch; if special conditions such as manual system maintenance are judged, a weak current on-off loop is put into use; a capacitor of a resonant circuit does not need to be externally provided with a charging circuit, a main through-flow branch adopts a vacuum switch to replace a power electronic device, a fault processing module adopts a half-control device, and the economic performance of the whole machine is excellent; the capacitor reset loop recovers the preset voltage of the capacitor, and the secondary breaking capacity of the circuit breaker is ensured under the medium-high voltage working condition. The device has good use value and economic benefit in the field of direct current power transmission and distribution and the like.

The invention relates to a direct current fault ride-through method, a direct current fault ride-through device, direct current fault ride-through equipment and a medium. The method comprises the following steps: switching a control mode of network-forming type energy storage into an alternating-current voltage control mode or a direct-current control strategy, carrying out coordinated control on devices in a multi-terminal direct-current collecting and sending-out system, clearing fault current, and clearing the fault current by utilizing an active step-down control strategy or the direct-current control strategy at the same time. According to the method, measures such as additional direct current circuit breakers are not needed, control is flexible and easy to achieve, the multi-terminal direct current collecting and sending-out system after fault clearing is controlled to be recovered by judging the operation state of the multi-terminal direct current collecting and sending-out system, and safe and stable operation of the multi-terminal direct current collecting and sending-out system is facilitated.

The invention relates to the technical field of energy storage, and discloses a synchronous test platform for multiple energy storage converters and a control method of the synchronous test platform. The test platform comprises a wire inlet switch, a pre-charging loop, a transformer, an auxiliary power supply switch, an alternating-current circuit breaker, a direct-current circuit breaker and a unit controller, a power grid is connected to the high-voltage side of the transformer through the wire inlet switch and the pre-charging loop in sequence, and one side of the alternating-current circuit breaker is connected with a winding on the low-voltage side of the transformer. The direct current side of the first group of energy storage converters is connected with the direct current side of the second group of energy storage converters through the direct current circuit breaker, and the first group of energy storage converters is connected with the auxiliary power supply. According to the test platform, the pre-charging loop is bypassed after the first group of PCS is pre-charged, then the first group of PCS unlocks the direct current voltage control mode, and the second group of PCS starts in sequence control, so that the synchronous charging and discharging test of 2N PCSs is realized, and the charging and discharging test efficiency of the energy storage converter is greatly improved.

Examples described herein provide a system for controlling power flow in an energy distribution network. The system includes a plurality of inverters, each having an inverter controller associated therewith. The system further includes a utility controller associated with a utility and configured to communicate with at least a subset of the plurality of inverters. The system further includes a customer controller associated with a customer of the utility and configured to communicate with at least the utility controller. The system further includes a direct current (DC) breaker associated with a battery of the customer. The system further includes a DC meter of the customer, the DC meter and the DC breaker each configured to communicate with the utility controller and the customer controller. The utility controller is configured to determine a current operational scenario of the energy distribution network and to control power routing within the energy distribution network.

The invention discloses a flexible direct-current power transmission system and a fault ride-through method and system thereof. The flexible direct-current power transmission system comprises a main control module, and a new energy sending-out system, an alternating-current energy consumption device, a sending-end converter, a direct-current circuit breaker, a receiving-end converter and a receiving-end alternating-current power grid which are connected in sequence, the direct current circuit breaker is deployed on a direct current power transmission line between the sending end converter and the receiving end converter, and the receiving end converter is a modular multi-level converter formed by cascading a plurality of half-bridge sub-modules with damping branches; the main control module is in communication connection with the half-bridge sub-modules, the direct-current circuit breaker and the alternating-current energy consumption device and used for controlling the damping branches of the half-bridge sub-modules in the running state, the direct-current circuit breaker and the alternating-current energy consumption device to act when a direct-current fault occurs so as to restrain direct current and adjust direct-current voltage to be within a set voltage range. Therefore, no-locking fault ride-through is completed. According to the invention, high-reliability and low-cost DC fault ride-through can be realized.

The invention discloses an offshore wind power direct current networking system sharing an energy consumption device and a fault ride-through method, an offshore MMC current converter is connected through a direct current connection submarine cable at the direct current side of the offshore MMC current converter of the offshore wind power direct current networking system, and a direct current circuit breaker optimal configuration scheme is provided. According to the method, the direct current energy consumption device only needs to be configured on the direct current side of one offshore MMC converter, fault ride-through operation of the whole direct current networking system under different faults can be achieved through a coordination control strategy among the land MMC converter, the offshore MMC converter and the direct current energy consumption device, the construction cost of an offshore wind power direct current networking project is remarkably reduced, and the fault ride-through operation of the whole direct current networking system under different faults can be achieved. Good application prospects are realized.

The invention discloses a bidirectional power electronic switch, a hybrid DC circuit breaker and a control method. The bidirectional power electronic switch comprises a diode bridge module, a buffer circuit, a voltage limiting circuit and an impedance adjusting circuit. The impedance adjusting circuit is connected in parallel with two ends of the diode bridge module; the buffer circuit is connected in parallel with a breaking electronic switch in the diode bridge module; the voltage limiting circuit is connected in parallel with two ends of the breaking electronic switch; the diode bridge module controls the breaking electronic switch to switch current according to a breaking instruction of the power system; when the breaking electronic switch is locked, the buffer circuit suppresses the voltage and current changes of the breaking electronic switch in the switching process, the voltage limiting circuit limits the overvoltage level of the breaking electronic switch, and the impedance adjusting circuit reduces the oscillation frequency. The impedance adjusting circuit reduces the oscillation frequency, reduces the requirement for the reverse recovery speed of the diode, reduces the stress of the diode bridge type module, and enables a conventional common diode to be not liable to be damaged.

This invention relates to the field of energy storage technology and discloses a synchronous testing platform for multiple energy storage converters and its control method. The testing platform of this invention includes: an incoming line switch, a pre-charge circuit, a transformer, an auxiliary power supply switch, an AC circuit breaker, a DC circuit breaker, and a unit controller. The power grid is connected to the high-voltage side of the transformer sequentially through the incoming line switch and the pre-charge circuit. One side of the AC circuit breaker is connected to the windings on the low-voltage side of the transformer, and the other side is connected to the AC side of the energy storage converter. The DC side of the first group of energy storage converters is connected to the DC side of the second group of energy storage converters through DC circuit breakers. The first group of energy storage converters is connected to the auxiliary power supply. In this invention, after the first group of PCS (Power Storage Converters) is pre-charged, the pre-charge circuit is bypassed. Then, the first group of PCS is unlocked and controlled in DC voltage mode, and the second group of PCS is started sequentially, thereby achieving synchronous charging and discharging testing of 2N PCS, greatly improving the charging and discharging testing efficiency of the energy storage converter.

The invention discloses an online detection method for a medium and low voltage direct current circuit breaker, and relates to the technical field of power system protection control, and the method comprises the following steps: S001, building a radiation echo spectrum distribution model during the switching operation of the direct current circuit breaker, calculating an interference intensity estimated value through collecting a current drop rate and a fracture voltage climbing rate, and calculating the interference intensity estimated value according to the current drop rate and the fracture voltage climbing rate; and extracting a disturbance frequency band with concentrated interference energy and generating a characteristic signal set for representing an interference propagation path. According to the method, a closed-loop anti-interference mechanism is constructed through feature modeling, interference recognition, signal correction and parameter optimization, the stability and accuracy of state judgment are improved, misjudgment and response failure caused by high-frequency interference are prevented, the method is particularly suitable for a complex parallel system and a frequent on-off scene, and the safety and the intelligent level of a direct-current system are effectively enhanced.

The invention provides a direct-current circuit breaker and a control method thereof, and belongs to the technical field of direct-current middle-high voltage power system fault protection. The short circuit turn-off branch comprises a first capacitor and a first thyristor; the coupling commutation branch comprises a first inductor, a second inductor, a second thyristor and a third capacitor; the rated turn-off branch comprises a first resistor and a second capacitor; the first resistor, the second capacitor, the first capacitor and the second inductor are sequentially connected in series and then are connected with the main switch branch in parallel; the first inductor, the second thyristor and the third capacitor are sequentially connected in series, and the first inductor and the second inductor form mutual inductance. By controlling the on-off of the first thyristor, the first capacitor and the second capacitor are connected in series, the capacitance value is reduced, large-capacitance-value operation of a single group of capacitors is realized, and the problem that the on-off time of rated and lower low-current breaking is relatively long can be solved.

The invention provides a medium-voltage direct-hanging multi-level energy storage grid-connected direct-current fault isolation method and device. The method comprises the following steps of: establishing corresponding protection partitions on a phase arm, a bus section and a battery cluster, configuring a polarity controllable blocking sub-module capable of being inserted with reverse voltage on the phase arm, and respectively configuring direct-current circuit breakers on the bus section and the battery cluster; generating a criterion set based on the measured value, and performing consistency voting on the criterion set to obtain a direct current fault determination result and a partition positioning result; when a fault is determined, issuing modulation and zero setting, and calculating a reverse equivalent voltage according to the change rate of the phase arm current and the target current to trigger the insertion of a polarity controllable blocking sub-module; selectively driving a corresponding direct current circuit breaker to be switched on and off according to a partition positioning result, or splitting a fault phase arm; and after selective switching-off is completed, outputting an isolation state to a grid-connected control unit of the energy storage grid-connected system. According to the invention, millisecond-level robust fault discrimination, partition selective isolation, cooperation of current limiting and on-off can be realized, and the removal range is narrowed.

The invention discloses an RC-IGCT-based superconducting hybrid DC circuit breaker, and relates to the topological structure and working principle analysis of DC circuit breakers. The circuit topology comprises two parts: (1) a resistance-type superconducting fault current limiter R-SFCL and a UDS isolation switch adopting a TP KEMA arc model are connected in series, and (2) a current commutation component composed of diodes VD1-VD4, a current injection branch and a current commutation branch. VD1-VD4 are used for conducting bidirectional current; the current injection branch comprises a pre-charging capacitor C, an inductor L and a thyristor T which are connected in series; the current commutation branch circuit is formed by connecting a power electronic switch, an RCD buffer branch circuit and an energy absorption branch circuit in parallel, and the energy absorption branch circuit is composed of a metal oxide lightning arrester; the invention further discloses a current breaking method of the superconducting hybrid direct-current circuit breaker. According to the invention, quick switching-off can be realized after fault current occurs, the rise rate of the fault current is limited, and the loss and the cost are low under the normal through-current condition.

The invention discloses a hybrid DC circuit breaker optimization design method and system based on machine learning, and belongs to the technical field of low-voltage power distribution. According to the method, feature vectors are constructed based on mechanical circuit breaker arc waveforms, circuit feature parameters and product parameters under different short-circuit working conditions, and an LSTM model introducing an attention mechanism is adopted to predict the arc waveforms; key parameters such as power electronic device switching loss and energy consumption branch working time are extracted, and the quantitative relation between the on-off time and device characteristics is established; by taking the minimum breaking time as an optimization target, combining nonlinear constraints such as temperature rise, withstand voltage and a latching effect, performing multi-parameter global optimization by utilizing a genetic algorithm, outputting optimal design parameters, and determining a design scheme of the hybrid circuit breaker according to the optimal design parameters, the development cost of the hybrid circuit breaker is reduced, the development time is shortened, and the development efficiency is improved. And a high-performance hybrid circuit breaker can be formed.

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 utility model provides a DC switch cabinet edge monitoring device comprising a DC circuit breaker, the DC circuit breaker comprises a plurality of auxiliary contacts, and the plurality of auxiliary contacts are arranged at a plurality of positions of a control loop; the monitoring module comprises a current monitoring assembly, an auxiliary position contact monitoring assembly and a distance monitoring assembly, and the monitoring module is connected with the direct current circuit breaker; the edge calculation module is used for receiving a current signal, monitored by the current monitoring assembly, of the direct-current circuit breaker, a state signal of the auxiliary contact and a numerical value signal, monitored by the current monitoring assembly, of the contact connecting rod mechanism, the edge calculation module is provided with a fault triggering threshold value, and when the received signal numerical value is larger than or smaller than the fault triggering threshold value, the fault is triggered. According to the device, the problem that core components in the direct current switch cabinet are not analyzed is solved, and the comprehensiveness and reliability of monitoring of key nodes in the direct current switch cabinet are improved.

According to the mechanical direct-current circuit breaker based on the variable inductor and the method, in the circuit breaker, a switch branch comprises a vacuum switch VB and a current sensor which are connected in series; the reverse injection branch is connected in parallel to the two ends of the vacuum switch VB, comprises a pre-charging capacitor, a discharging thyristor, a multi-stage series inductor and a parallel thyristor module, and is selectively connected in series with the multi-stage series inductor according to the detected fault current so as to realize variable inductance; a reverse injection current is formed to realize current zero passage and arc quenching of the VB fracture of the vacuum switch; the energy consumption branch is connected in parallel to two ends of the vacuum switch VB and is used for dissipating residual energy in the loop after the mechanical direct current circuit breaker is switched off; the controller is connected with the current sensor and the thyristors and used for judging the number of inductors needing to be input according to the rise rate and amplitude of fault current and controlling the corresponding thyristors to be switched on, and graded inductor series-in and reverse current injection of the multi-stage series inductors of the variable inductor are achieved.

The invention discloses a bidirectional direct current circuit breaker which comprises an electronic branch assembly, a voltage limiting branch assembly and an energy consumption branch assembly. The electronic branch assembly is used for transferring current; the voltage limiting branch assembly is electrically connected with the electronic branch assembly in parallel so as to reduce the turn-off overvoltage of the circuit breaker; and the energy consumption branch assembly is electrically connected with the electronic branch assembly in parallel so as to be used for absorbing the energy of the circuit. According to the hybrid DC circuit breaker, the current transfer function of the hybrid DC circuit breaker can be realized through the electronic branch assembly, the voltage limiting branch assembly and the energy consumption branch assembly. Compared with a bidirectional direct-current circuit breaker based on a power electronic device in the related technology, the bidirectional direct-current circuit breaker is compact in structure, low in connection inductance and high in universality, and functional units can be configured. The problems that in the related technology, connection is complex, redesign is needed under different working conditions, and functional units are inconvenient to adjust are solved.

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.

The utility model provides a testing device for a direct-current circuit breaker handcart, which comprises an equipment mounting rack, a computer and communication equipment, and is characterized in that the equipment mounting rack is provided with testing equipment used for being connected with a direct-current circuit breaker, and the testing equipment is connected with the computer through the communication equipment; the equipment mounting frame comprises a vertically-arranged perforated plate and supporting frames correspondingly arranged on the left side and the right side of the perforated plate, rotatable supporting blocks are arranged below the supporting frames, connecting pieces are arranged at the ends, facing the supporting frames, of the supporting blocks, telescopic rods are arranged at the other ends of the supporting blocks, one ends of the connecting pieces are arranged on the supporting blocks, and the other ends of the connecting pieces are arranged on the telescopic rods. And the other end is detachably connected with the support frame. The testing device for the direct-current circuit breaker handcart can be used for testing and simulating a direct-current source circuit breaker, and has the advantages of being simple in structure and easy to store and use.

The application provides a non-unit two-section protection method for a high-voltage direct current power grid direct current transmission line, comprising the following steps: (1) in a normal state, real-time detection of current and voltage at the installation position of the non-unit protection is performed, and line mode voltage and zero mode voltage are obtained; when the current rate of change is greater than a threshold value, step (2) is performed; (2) fault polar selection is performed, and a pre-action instruction is then issued to a circuit breaker on a potential fault pole to perform first commutation; meanwhile, step (3) is performed; (3) a section I protection time window is started; if the voltage rate of change at the installation position of the non-unit protection meets section I protection criteria, a second commutation instruction is issued to a direct current circuit breaker to perform second commutation; otherwise, step (4) is performed; (4) a section II protection time window is started after a delay; if the line mode voltage rate of change at the installation position of the non-unit protection meets section II protection criteria, a second commutation instruction is issued to a direct current circuit breaker to perform second commutation; otherwise, a pre-action return instruction is issued to the direct current circuit breaker.

The invention provides a pulse power module for discharging a super capacitor, which is applied to the field of fusion. The module adopts a double-layer discrete structure and comprises a converter box and a high-voltage box which are arranged on a primary side and are mutually independent, and the high-voltage box is positioned above the converter box and is electrically connected with the converter box to form a main circuit. A water-cooling heat dissipation H-bridge converter unit and a direct-current support capacitor are integrated in the converter box; and an air-cooled radiating direct current circuit breaker and a smoothing reactor are integrated in the high-voltage box. The module is further provided with a double-loop redundant power supply system which adapts to the fusion pulse discharge working condition, electricity is taken from the input side of the high-voltage box and the direct-current bus side of the converter box respectively, and power is reliably supplied to the control unit through a high-voltage optimization strategy. The problems of complex heat dissipation management, unstable power supply, inconvenient maintenance and the like in fusion high-power pulse application are effectively solved, and the reliability and the safety of the system are improved.

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 present invention provides a method and system for inferring the operating status of a high-voltage direct current (HVDC) circuit breaker, comprising: collecting eigenvalues ​​of each characteristic parameter in a feature subset of the HVDC circuit breaker; calculating, based on the eigenvalues, a correlation coefficient matrix and a self-increase / decrease trend matrix of the characteristic parameters of the HVDC circuit breaker; and inferring the operating status of the HVDC circuit breaker using the correlation coefficient matrix and the self-increase / decrease trend matrix. The feature subset of the HVDC circuit breaker is obtained by screening the characteristic parameters in an initial feature quantity set of the HVDC circuit breaker based on the maximum correlation principle, the minimum redundancy principle, a multi-criteria weighted sorting algorithm, and an association algorithm. The present invention provides data support for operators to promptly understand the operating status of the HVDC circuit breaker, detect early defects of the HVDC circuit breaker, and scientifically formulate condition-based maintenance plans. This provides strong technical support for improving the overall operating efficiency and reliability of the HVDC circuit breaker.

The invention belongs to the technical field of power electronics, and particularly relates to a solid-state direct-current circuit breaker module based on IGCTs, an upper pressing plate and a lower pressing plate are connected through a first screw rod, the number of first radiators is one more than that of the IGCTs, and the first radiators and the IGCTs are arranged in an overlapping mode; the number of the second radiators is one more than that of the first fast recovery diodes, and the second radiators and the first fast recovery diodes are arranged in an overlapping mode. First insulating cushion blocks are arranged between the first radiators and the lower pressing plate and between the second radiators and the lower pressing plate. Insulating cushion blocks II are arranged between the radiator I and the upper pressing plate as well as between the radiator II and the upper pressing plate and correspondingly abut against the radiator I and the radiator II through two force application mechanisms positioned on the inner side of the upper pressing plate; the piezoresistor is installed on the side, away from the first radiator, of the second radiator, the RCD protection unit is installed on the insulating plate, and the insulating plate is installed on the upper pressing plate and the lower pressing plate and located on one side of the first radiator and one side of the second radiator. The structure is compact, maintenance is easy, pressure is uniform, stray inductance is reduced, and overall stability and response speed are improved.

The application discloses a stable direct-current circuit breaker oscillation characteristic measuring device, which comprises a main body composed of a shell, an operation panel arranged on one side of the shell and a measuring mechanism arranged in the shell, a wire passing support is movably connected to the side of the shell and close to the operation panel, and the wire passing support is arranged in one-to-one correspondence with the interfaces on the operation panel; the interfaces of the wire passing support and the operation panel are horizontally arranged, and the measuring cable between the interfaces of the wire passing support and the operation panel has a movement allowance. The stable direct-current circuit breaker oscillation characteristic measuring device with the above structure can make the wiring more stable and does not affect the normal use of the operation panel by arranging the wire passing support, winding a part of the measuring cable on the wire passing support and then inserting the remaining part into the corresponding interface position of the operation panel.

The invention relates to the technical field of distribution boxes, and discloses an AC / DC intelligent distribution box, which comprises a box body, an upper flip cover hinged to the front side of the box body and an AC distribution module arranged in the box body, and also comprises a DC distribution module comprising a rectifier module and a main transformer arranged in the box body, the main transformer is respectively connected with a plurality of direct-current circuit breakers arranged in the box body through direct-current power transmission lines, branch transformers corresponding to the direct-current circuit breakers are arranged in the box body, alternating current is converted into direct current through a rectifier module after passing through a main power switch of the alternating-current power distribution module, and then voltage regulation is carried out through the main transformer; a temperature control heat dissipation module and a self-soot-blowing top cover; the self-soot-blowing top cover is arranged at the top of the box body, and soot blowing cleaning is carried out through the temperature control heat dissipation module; compared with the prior art, the power connection socket has the advantages that an alternating current power supply and a direct current power supply are provided for the power connection socket at the same time, and dust falling on the top can be automatically cleaned.

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 invention provides a controllable zero-crossing direct-current circuit breaker and a control method thereof, and belongs to the technical field of power electronics. The controllable zero-crossing direct-current circuit breaker comprises a through-flow branch, a current transfer branch and an energy dissipation branch, adopts semi-control and full-control devices, and is simple in logic, economical and reliable. According to the circuit breaker, the thyristors and the IGBTs are matched to input the pre-charging capacitors, the bidirectional breaking capacity is achieved, and the short-circuit current of a direct-current power grid can be effectively broken; meanwhile, the number of current zero crossing points of a mechanical switch branch during a fault is greatly increased, and the reliability of the direct-current circuit breaker is enhanced. The invention provides a control method of a controllable zero-crossing direct-current circuit breaker. The controllable zero-crossing type direct-current circuit breaker is controlled under the two conditions that the direct-current line where the circuit breaker is located operates normally or before the fault of the direct-current line where the circuit breaker is located is detected and after the fault of the direct-current line where the controllable zero-crossing type direct-current circuit breaker is detected.