896 results about "Vacuum circuit breakers" patented technology

The invention relates to the technical field of control systems, in particular to a control system and a control method of an intelligent permanent magnet vacuum circuit breaker, and the system comprises a multi-source signal synchronous acquisition module, an operation mechanism box body of the permanent magnet vacuum circuit breaker and acceleration sensors arranged at preset positions around a permanent magnet operation mechanism, a voltage transformer and a current transformer are connected to a line interface, and a unified sampling frequency and a trigger condition are set. According to the method, vibration, voltage and current signals are synchronously collected at key parts of the permanent magnet vacuum circuit breaker, timestamps are applied, a data basis of multi-source information strong association is constructed, and the direct time sequence relation between the electrical transient state and the mechanical response can be revealed. Segmented windowing and frequency spectrum transformation are carried out on collected vibration signals, a time frequency energy distribution diagram is generated, and instantaneous frequency components and energy evolution details generated by non-stationary events such as impact and friction in the opening and closing process are captured.

The invention discloses a vacuum circuit breaker state online monitoring method and system based on digital twinning, and relates to the field of intelligent operation and maintenance of high-voltage power equipment. According to the method, various sensors are arranged at key parts of the vacuum circuit breaker, breaking current, shielding case potential and vibration signals are collected in real time, and a digital twinborn model is constructed by combining multi-source data preprocessing, three-dimensional modeling, behavior rule definition and fault simulation analysis; and on-line identification and trend prediction of electrical wear, vacuum degree deterioration and mechanical abnormity are realized. The system has the functions of real-time monitoring, three-dimensional visualization, model self-learning and intelligent early warning, can be widely applied to intelligent monitoring and state evaluation of circuit breaker equipment in a power system, and remarkably improves the operation safety and operation and maintenance efficiency of the equipment.

The invention discloses a signal reconstruction denoising method for circuit breaker mechanical state evaluation and a storage medium. In order to solve the problems of multi-source signal aliasing and strong noise interference of the double-break vacuum circuit breaker, a technical route combining mechanical transfer function modeling and a double-flow deep network is innovatively adopted. A complex vibration source is analyzed by constructing a signal coupling model, environmental noise is accurately filtered by using a multi-stage noise reduction strategy, and a multi-dimensional state vector is constructed by fusing time-frequency domain features, so that accurate evaluation of the health state of the equipment is realized. Experiments show that the method is remarkably superior to the prior art in signal denoising, feature extraction precision and diagnosis accuracy, and an efficient solution is provided for intelligent operation and maintenance of power equipment.

The invention specifically relates to a vacuum circuit breaker evaluation system based on multi-modal data analysis, and relates to the technical field of power equipment state monitoring and fault diagnosis. A multi-modal feature extraction and selection module; a fault probability analysis module; and a fault matching and evaluating module. According to the method, key features and a dynamic threshold adjustment mechanism are accurately screened from mass data, traditional fixed threshold limitation is broken through in combination with fault types, noise and stages, key features are prevented from being mistakenly deleted or redundantly reserved, for example, for vacuum arc-extinguishing chamber faults, acoustic feature threshold values are reduced, weak guarantee is achieved, but key features are reserved, and therefore the reliability of the system is improved. Through preliminary screening, importance sorting and redundancy removal, finally 30-40 features focus on the core, multi-modal key information is covered, and calculation redundancy is avoided.

The invention discloses a side-mounted vacuum circuit breaker, which comprises a vacuum arc-extinguishing chamber, an operating mechanism and a side-mounted fixing piece, and is characterized in that the vacuum arc-extinguishing chamber is connected to the rear side of the operating mechanism through the side-mounted fixing piece; the operating mechanism comprises a box body, a spring, a main shaft, a second intermediate gear and a second lower driving gear, the spring, the main shaft, the second intermediate gear and the second lower driving gear are mounted in the box body, the main shaft is linked with an insulating pull rod of the vacuum arc-extinguishing chamber through a transmission mechanism, and the spring is connected to one end of the main shaft; the second intermediate gear is sleeved on the main shaft; the second lower driving gear is meshed with the second intermediate gear; a circle of gear teeth are distributed on the side face of the second intermediate gear, and the reference axis formed by the circle of gear teeth coincides with the reference axis of the second intermediate gear. An upper driving gear and a secondary transmission gear in the box body are omitted, an external second energy storage motor is adopted, the number of disassembly and assembly steps is smaller, and the maintenance efficiency is higher.

The invention belongs to the field of overvoltage protection, and relates to an overvoltage stabilizing and protecting device which comprises a data acquisition operation module, a control logic module, a display module, an overvoltage protecting assembly and a high-voltage vacuum circuit breaker or an electric isolation handcart structure. The real-time monitoring and protection of the working state of the overvoltage protection assembly are realized; through the arrangement of the high-voltage circuit breaker or the electric isolation handcart, when the overvoltage protection assembly is detected to be abnormal, the connection between the overvoltage protection assembly and the high-voltage bus can be rapidly cut off, so that the system safety is ensured; the device integrates a transient fault recording function and can capture wave map data before and after a power frequency overvoltage fault of the system; the overvoltage protection assembly in the device adopts a geometric center air cooling heat dissipation mode, the fan is quick in starting response, the operating temperature of the overvoltage protection assembly is greatly reduced, the operating time of the overvoltage protection assembly can be effectively prolonged, and the device adopts an integrated modular structural design, so that the operation safety, the maintenance and the management are greatly facilitated.

The invention relates to the field of vacuum circuit breakers, in particular to a vacuum circuit breaker opening and closing dynamic characteristic calculation method, device and equipment and a medium. Establishing a three-dimensional geometric model of the pole-mounted vacuum circuit breaker arc extinguish chamber and the moving and static contacts; setting material attributes for each part in the three-dimensional geometric model; constructing a multi-physics field coupling system; the area where the moving contact is located is divided into movable grids, and the grid density of the moving contact and the grid density of the static contact dynamically change along with time; and performing multi-field coupling transient solution according to the three-dimensional geometric model, the multi-physical field coupling system and the movable grid to obtain the dynamic characteristics of the vacuum circuit breaker. The electromagnetic field, the thermal field, the fluid field, the structure field and the circuit are subjected to full coupling analysis, multi-physical field strong coupling dynamic simulation of the whole opening and closing process is achieved, and the dynamic characteristics of the whole opening and closing process can be accurately calculated.

The invention discloses a side-mounted vacuum circuit breaker ring main unit, which relates to the technical field of ring main units, and comprises a multi-source sensing module used for collecting and converting state parameters from equipment in the ring main unit and the environment of the ring main unit; the state fusion processing module is used for configuring rules according to a set sampling period and a threshold value; the intelligent auxiliary identification module is used for establishing a mapping relation between the multi-dimensional state parameters and the potential risk factors; the digital twin modeling module is used for constructing a virtual simulation model consistent with the ring main unit; the authority control and interlocking judgment module is used for fusing the state vector, the risk index value and the operator instruction parameter according to a preset authority strategy rule; the closed-loop control module comprises a control logic unit and a simulation verification unit and is configured to respond to the state event trigger signal, call a control instruction generation mechanism and call a virtual model to perform forward deduction on a control effect; according to the invention, the stability of equipment operation and the intrinsic safety level of operation are greatly improved.

The invention provides a vacuum circuit breaker with an isolating switch, which comprises a switch body and an anti-misoperation device, the anti-misoperation device comprises a first cam and an interlocking plate, the first cam is fixed on an isolating main shaft and rotates along with the isolating main shaft in a linkage manner, the interlocking plate is movably mounted on the switch body, and when the isolating main shaft is in a switching-off position, the interlocking plate rotates along with the isolating main shaft. The interlocking plate is driven by the first cam to be in a locking position, so that the interlocking plate is matched with the handle of the circuit breaker to be locked, the circuit breaker is prevented from being switched on, the situation that maintenance personnel can still manually drive the circuit breaker to be switched on when the disconnecting switch and the circuit breaker are both in a switching-off state in the prior art is avoided, unnecessary operation is prevented, and time and labor are saved; in addition, when the isolating switch is in a closing position, the isolating main shaft drives the first cam to rotate, the interlocking plate is separated from the circuit breaker handle under the acting force of the elastic piece, and the circuit breaker can be closed.

The invention discloses a longitudinal rotation indoor alternating current metal-enclosed switchgear, which comprises a cabinet body, and a contact box device, a valve device, a longitudinal rotation isolation vacuum circuit breaker and an inductance device which are arranged in the cabinet body from top to bottom, and a driving assembly respectively acts on the longitudinal rotation isolation vacuum circuit breaker and the valve device; through partial strokes of the longitudinal rotation isolation vacuum circuit breaker and the valve, namely, the longitudinal rotation isolation vacuum circuit breaker and the valve device share one driving assembly, but the time point when the valve is driven by the driving assembly is ended earlier than the longitudinal rotation isolation vacuum circuit breaker or executed later than the longitudinal rotation isolation vacuum circuit breaker. Therefore, the motion stroke of the valve is shortened, the space requirement of the valve in the cabinet body is reduced, and the miniaturization of the longitudinal rotation indoor alternating-current metal-enclosed switchgear is realized.

The invention provides an intelligent phase control vacuum circuit breaker health degree assessment method and device and a circuit breaker, and relates to the technical field of circuit breaker health assessment, and the method comprises the steps: carrying out the vacuum degree detection of an arc extinguish chamber in an intelligent phase control vacuum circuit breaker, and obtaining the vacuum degree; performing heating analysis on the vacuum circuit breaker according to the vacuum degree to obtain a heating parameter, and performing zero crossing point monitoring error analysis to obtain a zero crossing point error coefficient; according to the operation time parameter of the vacuum circuit breaker, mapping to obtain a mapping zero-crossing point error coefficient, calculating to obtain a zero-crossing deviation coefficient, and according to the zero-crossing deviation coefficient and an analysis deviation coefficient of heating analysis and zero-crossing point monitoring error analysis, carrying out confidence degree processing to obtain a zero-crossing confidence degree; and distributing a weight according to the zero-crossing confidence coefficient, and performing health degree calculation based on the vacuum degree and the zero-crossing point error coefficient to obtain the health degree of the vacuum circuit breaker. The technical problem of inaccurate health degree evaluation of the intelligent phase-controlled vacuum circuit breaker in the prior art is solved.

The invention provides a permanent magnet vacuum circuit breaker actuation time prediction method, which comprises the steps of S1, obtaining parameters of a permanent magnet operating mechanism according to an actual model of the permanent magnet operating mechanism in a permanent magnet vacuum circuit breaker; s2, constructing a BP neural network and setting training parameters according to the parameters of the permanent magnet operating mechanism; s3, optimizing an initial weight and a threshold parameter of the BP neural network by adopting a cloud genetic algorithm; s4, acquiring historical data or simulation data of the action of the permanent magnet operating mechanism as a training sample, and performing training learning on the BP neural network; and S5, the BP neural network prediction model meeting the training requirements is adopted to predict the action time of the permanent magnet operating mechanism. According to the invention, a BP neural network is optimized by using a cloud genetic algorithm (CGA), and a permanent magnet operating mechanism actuation time prediction model is established. The defects that a BP neural network is too many in iteration step number, low in convergence speed, prone to falling into a local minimum value and not capable of achieving global optimization are overcome.

The invention discloses a method and device for evaluating the electrical life of a high-capacity vacuum circuit breaker, and belongs to the technical field of vacuum circuit breakers, and the method comprises the steps: calculating the energy flow cumulant of a contact according to the obtained constant value, arcing time and arc current waveform related to a contact material; calculating the ablation deformation quantity of the contact blade according to the pre-obtained contact closing holding force and over travel; according to the obtained contact energy flow threshold value and the obtained contact blade ablation deformation threshold value, the residual electrical life of the high-capacity vacuum circuit breaker is calculated in combination with the contact energy flow cumulant and the contact blade ablation deformation quantity; judging whether the obtained residual electrical life of the high-capacity vacuum circuit breaker is lower than a set value or not, if not, repeating the steps, and if yes, alarming and ending; according to the invention, through comprehensive analysis of multiple parameters, evaluation of the electrical life of the high-capacity vacuum circuit breaker is realized according to an influence rule of different parameters on the electrical life of the vacuum circuit breaker.

The invention discloses a vacuum arc-extinguishing chamber contact surface condition evaluation method and system, and belongs to the technical field of vacuum circuit breakers. According to the method, short-time Fourier transform noise reduction is improved by adopting an adaptive window length, signals are enhanced in combination with dual-tree complex wavelet transform, and data are dynamically normalized by improving K-means clustering; according to the constructed lightweight CRNN model, residual connection and an SE module are introduced into a convolution module, and a bidirectional quasi-recurrent neural network is adopted by a circulation module to capture time sequence features; the mixed loss function is combined with an AdamW optimizer, and the convergence stability is improved through L2 regularization; and dynamically evaluating the ablation degree of the contact based on a fuzzy logic algorithm. According to the method, through time-frequency feature fusion and lightweight network design, high-precision classification of direct-current pre-breakdown waveforms is realized, the problems of degradation, over-fitting and slow convergence of a traditional model are solved, and an intelligent solution is provided for vacuum arc-extinguishing chamber insulation performance evaluation.

The invention relates to the technical field of vacuum circuit breakers, and discloses a digital deep fusion outdoor high-voltage vacuum circuit breaker which comprises a shell, a protection base is arranged on the shell, a placement groove is formed in the protection base, a plug is arranged in the placement groove, a digital unit used for inserting the plug is arranged on the protection base, and a protection shell is arranged on the shell. The protective shell is used for blocking an opening of the placing groove, a fastener is arranged on the protective shell, and the fastener is used for realizing mutual fixation of the protective shell and the protective base. The protective shell is mounted on the protective base through the fastener, so that the protective base and the protective shell can protect the digital unit; therefore, the digital unit can be stably fixed with the plug, the external damage to the digital unit is reduced, and the digital unit is not easy to damage due to rainwater.

The invention discloses a high-voltage vacuum circuit breaker contact motion detection method and system based on an inversion model, and the method comprises the steps: firstly designing a dual-position speed sensor collection unit for collecting speed signals of different positions and different characteristics, and achieving the mutual triggering; based on an inversion model, a programmable logic component and a CPU are adopted for result operation and logic inversion and correction, a rotation angular velocity curve is obtained, and the accurate motion state is obtained through comparison; according to the method, the stroke characteristic curve in the arc extinguish chamber of the high-voltage vacuum circuit breaker can be accurately reflected, mutual conversion of angular velocity and linear velocity at different positions can be realized based on the thought of an inversion model, and finally effective data which can be analyzed and judged can be output for system application.

The invention discloses a vacuum circuit breaker breaking method for a new energy occasion, particularly relates to the technical field of power equipment breaking control, and is used for solving the problems of local ablation and breaking life attenuation caused by non-uniform distribution of arc energy on the surface of a contact in an existing high-frequency harmonic environment. The dominant frequency component of the high-frequency harmonic is extracted in real time, and arc energy concentration area distribution is generated in combination with contact material characteristics; dynamically evaluating the thermal conductivity attenuation degree based on grain structure degradation, and adaptively matching the opening speed curve and the energy diffusion rate; the anode spot migration path is identified through dynamic impedance gradient monitoring, and the magnetic field distribution of the arc extinguish chamber is synchronously adjusted to realize targeted suppression; and after breaking, a clean electric arc matched with a damage path is triggered for cladding repair, so that the breaking stability of the vacuum circuit breaker under the impact of high-frequency harmonic waves and the ablation resistance of the contact are remarkably improved.

The utility model relates to the technical field of outdoor high-voltage vacuum circuit breakers, and discloses an outdoor high-voltage vacuum circuit breaker with an isolating switch, the top of a base is fixedly connected with a circuit breaker body, the middle part of the front side of the base is fixedly connected with a fixed shell, and the two sides of the fixed shell are fixedly connected with electric push rods. A clamping plate is fixedly connected to one side of the electric push rod, a connecting base is fixedly connected to the middle of the front side of the circuit breaker body, a winding roller is rotatably connected to the interior of the connecting base, an electric wire is arranged on the winding roller, and an isolating switch is fixedly connected to the bottom of the electric wire; a servo motor, a winding roller, an electric wire and the like are arranged to be matched with the disconnecting switch for use, the servo motor drives the winding roller to rotate so as to unwind the electric wire, the electric wire drives the disconnecting switch to move downwards so as to move to the position below the circuit breaker body, and therefore the danger of electric shock caused by an operator in the using process can be prevented; and a response can be conveniently and quickly made in an emergency.

The utility model relates to the technical field of enterprise power grid operation and maintenance, in particular to a rapid isolation protection device for a grounding fault of a power grid neutral point ungrounded system, and aims to solve the problems that when the grounding fault of the power grid neutral point ungrounded system is processed at present, grounding is relieved by generally adopting an arc-extinguishing and resonance-eliminating mode of manually resetting a rapid switch; and a large-area power failure accident is caused by breakdown and short circuit of an insulation weak point of equipment in a system due to too long processing time. According to the device, a fault point is isolated through zero-sequence power direction protection action tripping, closing of the vacuum circuit breaker is converted into metal grounding through action of the quick switch arc-extinguishing and resonance-eliminating circuit, and quick fault isolation is effectively realized through automatic resetting and delay setting functions of the arc-extinguishing and resonance-eliminating circuit. Therefore, the repeated action of the rapid switch arc-extinguishing and resonance-eliminating circuit caused by intermittent arc grounding is avoided, the occurrence rate of large-area power failure accidents caused by arc grounding is greatly reduced, and the safe and stable operation of an enterprise power grid is further ensured.

The invention discloses a parallel double-fracture collaborative breaking structure and method of a vacuum circuit breaker, and belongs to the technical field of circuit breaker structures. The structure comprises a spring operating mechanism, a current sharing mechanism, a transmission mechanism and a double-fracture circuit breaker assembly; the spring operating mechanism is arranged outside a sealed gas box of the gas insulated switchgear, and the spring operating mechanism is connected with the current sharing mechanism and drives the current sharing mechanism to move; the transmission mechanism comprises an upper motion guide rod and a lower motion guide rod, one ends of the upper motion guide rod and the lower motion guide rod are connected with the current sharing mechanism, the other ends are connected with the double-break circuit breaker assembly, and the motion consistency of the transmission mechanism is driven and controlled through the current sharing mechanism; the double-break circuit breaker assembly is connected with the transmission mechanism, and the transmission mechanism drives the double-break circuit breaker assembly to move and is used for switching on and switching off the vacuum circuit breaker switch. According to the invention, the current nonuniformity of the parallel multi-break vacuum circuit breaker in the opening and closing process can be effectively and structurally reduced, and the safety and reliability of power grid operation are improved.

According to one embodiment of the present disclosure, a vacuum circuit breaker may include: a pressure vessel filled with an insulating gas of a predetermined pressure; a vacuum interrupter provided inside the pressure vessel and having a fixed electrode and a movable electrode in a vacuum tube in a vacuum state; a bellows provided to seal a gap between the vacuum tube and the movable electrode; a movable rod, one end of which is connected to an end portion of the movable electrode via an insulating link, and which is capable of penetrating the pressure vessel and reciprocating in an axial direction while maintaining airtightness; a drive rod which is provided outside the pressure vessel at the other end of the movable rod and which transmits the driving force of the drive unit to the movable rod; and a contact pressure spring, one end of which is supported by the movable rod and the other end of which is supported by the driving rod, in which a ratio of a self-closing force of the vacuum interrupter to a minimum closed contact pressure is set to a predetermined ratio.

The invention discloses a vacuum degree condition evaluation method and system of a vacuum arc extinguish chamber, and belongs to the technical field of vacuum circuit breakers. The evaluation method combines RF and an XGBoost algorithm to realize heterogeneous integration, adds a GAN discriminator to perform physical constraint enhancement, and constructs a universal relation model of X-ray intensity and vacuum degree; the feature importance of RF can guide the feature selection or weighting of XGBoost and enhance feature interaction, the confrontation mechanism of GAN can coordinate data fitting and physical constraints, the physical rationality and data authenticity of model prediction are enhanced by means of confrontation training, and a discriminator is used for dual verification of a generated result. The model is ensured to conform to experimental data distribution and theoretical physical law constraints at the same time, and the result credibility is remarkably improved. According to the evaluation method, accurate fitting of the stable attenuation trend in the high vacuum stage and robustness prediction of fluctuation data in the critical vacuum stage can be achieved, and a new thought is provided for vacuum degree condition evaluation.

The invention discloses a circuit breaker contact structure integrated with a permanent magnet and a vacuum circuit breaker, and relates to the technical field of vacuum circuit breakers, the circuit breaker contact structure integrated with the permanent magnet comprises a contact piece, a contact cup, an insulation sleeve, a permanent magnet ring and a conducting rod, the contact piece and the conducting rod are arranged at the two ends of the contact cup respectively, the insulation sleeve is sleeved outside the contact cup, the permanent magnet ring is sleeved outside the insulation sleeve, and the contact cup is provided with a spiral slot. The vacuum circuit breaker adopts a circuit breaker contact structure integrated with a permanent magnet. Through innovative structural design and material application, the problems that in an existing vacuum circuit breaker contact structure, magnetic field phase lag and residual magnetism affect arc extinguishing are effectively solved, the longitudinal magnetic field control effect is enhanced at the current peak value, the residual magnetism is restrained at the current zero passage, coordination and cooperation of the two are achieved, and the service life of the vacuum circuit breaker is prolonged. The breaking performance and reliability of the vacuum circuit breaker are improved, and the breaking reliability of the vacuum circuit breaker is improved.

The invention relates to the technical field of power grid equipment fault processing, provides a fault diagnosis method, device and equipment of a high-voltage vacuum circuit breaker, a storage medium and a program product, and can improve the fault diagnosis accuracy of the high-voltage vacuum circuit breaker. The method comprises the following steps: acquiring a target vibration signal of a target high-voltage vacuum circuit breaker in a closing operation process; changing the target vibration signal from one dimension to two dimensions according to a Grubrum angle field image coding mode, and obtaining a two-dimensional time domain resolution graph; according to a generalized S transformation mode, the target vibration signal is changed from one dimension to two dimensions, and a two-dimensional frequency domain resolution graph is obtained; and inputting the two-dimensional time domain resolution graph and the two-dimensional frequency domain resolution graph into a fault diagnosis model to obtain a fault diagnosis result of the target high-voltage vacuum circuit breaker.

The invention relates to the technical field of switching device monitoring, and discloses an intelligent monitoring method and system for a vacuum circuit breaker. The method comprises the following steps: synchronously acquiring an operation mechanism vibration signal and an arc extinguish chamber arc current signal during opening and closing; the inherent frequency band energy ratio of the opening spring is extracted through wavelet packet decomposition to serve as a mechanical degradation factor; extracting an arc fluctuation factor based on the time domain integral of the current first-order derivative; the two factors are input into a multi-physics field correlation model, a coupling vector of the contact abrasion depth and the resistance moment of the transmission mechanism is output, and according to the method, a timestamp alignment mechanism that the current rising edge of the opening coil triggers the double-channel acquisition card is used, and synchronization of a vibration signal and a current signal is achieved. The system comprises corresponding function modules and an early warning mechanism. The problem of mechanical / electrical signal time domain splitting is solved, and the state monitoring precision of the vacuum circuit breaker is remarkably improved.

The utility model discloses a primary and secondary fusion high-voltage pole-mounted circuit breaker, which belongs to the technical field of circuit breakers, and is characterized in that a primary and secondary fusion assembly is mounted at the top of a fixing frame, a plurality of vacuum circuit breakers are mounted at the top of the primary and secondary fusion assembly, and a connecting rod assembly is mounted at the top of the fixing frame; a pull rod assembly is installed at the top of the installation plate and used for driving a connecting rod assembly, the pull rod assembly is installed at the operation end of the connecting rod assembly, two sliding blocks are fixed to the outer end of a movable pull rod, and a limiting groove is formed in a limiting block on the installation frame and used for limiting the sliding block on the movable pull rod. When the switch is switched on, the movable pull rod needs to be pulled upwards to enable the sliding block to be separated from the limiting groove, and then the movable pull rod can be rotated to drive the connecting rod assembly to switch on, so that switch-on caused by mistaken touch of workers can be prevented, and the safety is improved.

A vacuum circuit breaker operating device disclosed by the present invention comprises a switching-on structure, a switching-off structure, a switching-on and switching-off output main shaft and an energy storage mechanism which are arranged on a rack, and the switching-off structure comprises a switching-off spring connected with the switching-on and switching-off output main shaft, and a switching-off pinch plate and a switching-off half shaft which are rotatably arranged on the rack. A transmission connecting rod assembly is movably connected between the closing and opening output main shaft and the opening buckle plate, the energy storage mechanism is provided with a driving part which drives the transmission connecting rod assembly to move in an energy release state, and the transmission connecting rod assembly pushes the closing and opening output main shaft to rotate to a closing position. Through the transmission connecting rod assembly, motion and force can be transmitted between the energy storage mechanism and the on-off output main shaft, motion and force can also be transmitted between the on-off output main shaft and the opening buckle plate, the structure is simplified, a transmission chain is shortened, matched transmission is reliable, installation parts are reduced, the structure is more compact, and the manufacturing cost is reduced.

The invention relates to the technical field of electric power, in particular to a vacuum circuit breaker and a phase selection closing control method, and the vacuum circuit breaker comprises a hybrid electromagnetic mechanism and a vacuum arc-extinguishing chamber; the hybrid electromagnetic mechanism comprises a permanent magnet closing assembly and an electromagnetic repulsion opening assembly, the permanent magnet closing assembly comprises double coils and a T-shaped movable iron core which are arranged in parallel, and a discharge loop is formed to drive a movable contact of the vacuum arc-extinguishing chamber to complete a closing action and maintain a closing state; the electromagnetic repulsion opening assembly comprises a static coil panel and a moving coil panel which are coaxially and oppositely arranged to form a reverse current repulsion loop so as to drive a moving contact of the vacuum arc-extinguishing chamber to complete an opening action and maintain an opening state, and the moving coil panel is connected with a T-shaped moving iron core of the permanent magnet closing assembly through an insulating guide rod; the vacuum arc-extinguishing chamber comprises a driving connecting rod, a moving contact and a static contact, one end of the driving connecting rod is connected with the moving contact, and the other end of the driving connecting rod is connected with the insulating guide rod. Therefore, the opening and closing speed of the vacuum circuit breaker is improved.

The invention discloses an external mobile synchronous grid connection platform based on a low-voltage generator car, and relates to the technical field of synchronous grid connection, the external mobile synchronous grid connection platform comprises a box body and an intelligent control system, and an adjustable synchronous controller, a double-break vacuum circuit breaker and a multi-system interface panel are arranged in the box body; the intelligent control system comprises a voltage phase detection unit, a frequency tracking unit, a phase compensation unit, a grid-connected switch execution unit and a man-machine interaction unit. Through the application of the low-voltage generator car, the synchronous grid-connected platform and the non-inductive access exit, the maintenance, construction, switching and other work of a power system can be realized, the non-inductive operation of a user load end is realized, the power failure work of a user end is reduced to a great extent, the non-inductive access exit of the low-voltage generator car is realized, and the safety of the power system is improved. And through automatic control and quick response equipment, zero-sensing switching of a power supply system can be realized.

The invention discloses a fault detection method for a driver of a motor operating mechanism of a vacuum circuit breaker, and relates to the field of internal characteristic inversion of the motor operating mechanism of the circuit breaker. The method specifically comprises the following steps: firstly, constructing an MLD model of a motor driving system based on PWM switching semaphore of an inverter in a permanent magnet synchronous motor driving circuit and current and rotating speed of a motor driven by the inverter; carrying out open-circuit fault simulation analysis on the motor driving circuit in the MLD model; further performing fault simulation analysis to obtain a phase current vector value of an actual fault state of the motor, constructing a theoretical estimation model of the current according to actual parameters of the motor, and calculating a residual value of the actual fault current value and the current estimated by the theoretical estimation model; and finally, according to the current residual values, faults of an upper tube and a lower tube in the motor driving circuit are detected respectively. According to the invention, additional hardware circuits or sensors are not needed, dependence on external feedback signals is avoided, the control structure is simple and efficient, and the dual advantages of low cost and high reliability are achieved.