13results about How to "Avoid secondary failure" patented technology

The invention relates to the technical field of insulator relay protection, and provides a non-power-cut cable insulation wrapping device and method, and the device comprises a detection device, a wrapping device, and an insulation operation rod connected with the detection device and the wrapping device. The detection device is composed of a temperature measuring instrument, an electromagnetic radiation detector and a fixing frame, and the fixing frame is detachably connected with an insulating operating rod. The wrapping device comprises a fixing seat detachably connected with the insulating operating rod, a bracket and a motor box which are arranged at the top of the fixing seat, a rotating mechanism and a camera shooting mechanism. The rotating mechanism rotates around the axis of the wire by 360 degrees to drive the insulating tape to synchronously wrap the wire. A motor is arranged in the motor box, drives the rotating mechanism to rotate and is controlled by the circuit board. The camera mechanism monitors the package process in real time, and the package quality is guaranteed; after insulation wrapping is completed, the detection step is repeated, whether the wrapping is in place or not is ensured, and the reliability and effectiveness of repairing are further improved.

The utility model relates to the field of fuses, in particular to a melt structure of a high-speed fuse, which comprises a metal fuse piece. A V-shaped groove is bent at the center of the metal fuse piece along the long edge direction, and the metal fuse piece is filled with a tin bar in the V-shaped groove; a plurality of groups of row holes are formed in the metal fuse piece at intervals along the length direction of the metal fuse piece, the V-shaped groove and the tin bar are positioned between two groups of row holes in the middle, and a narrow diameter is formed between adjacent holes of each group of row holes; the aperture of the two groups of row holes located in the middle is larger than the aperture of the other groups of row holes, the outer sides of the two groups of row holes located in the middle are respectively provided with two insulating rubber strips, and the insulating rubber strips are fixedly connected with the metal fuse piece. According to the fuse structure, rapid fusing can also be realized for small-multiple overload current, and a relatively strong circuit protection effect is achieved.

The invention discloses a medium-voltage modular multi-level converter fault diagnosis method, which belongs to the field of power electronics. The method constructs the collected capacitor voltage values ​​of each submodule and the current values ​​of each bridge arm of the modular multi-level converter MMC into a data set, wherein the data set includes normal operation state data and fault operation state data of the submodules of the modular multi-level converter MMC; performs unique-hot encoding on the sample set according to the operation state of the modular multi-level converter to obtain an encoding vector as a class label; adopts a neural network and performs parameter training on the training set based on a BP back propagation algorithm to obtain a modular multi-level converter fault diagnosis model; inputs a test set into the MMC fault diagnosis model to perform open circuit fault diagnosis on each submodule of the modular multi-level converter, and obtains the fault type by matching with the class label; and does not need to introduce new devices such as sensors, and does not increase system cost and complexity.

This invention discloses a method and system for checking and repairing table structure consistency in GoldenDB databases, relating to the field of database data processing technology. The method includes: extracting standard metadata of distributed tables from the metadata dictionary table of the GoldenDB management node (MDS) as a consistency check baseline, and obtaining the sharding mapping relationship between logical tables and data nodes (DNs) based on the metadata; connecting each shard master DN in parallel according to the sharding mapping relationship, collecting the actual physical table structure metadata of the corresponding logical tables, and performing standardized preprocessing on the collected metadata; comparing the standardized sharding metadata with the baseline metadata in a layered manner from coarse to fine granularity, identifying metadata differences and classifying risk levels, matching corresponding repair strategies according to the risk levels, generating and executing adapted DDL repair scripts; after repair, re-executing metadata collection and comparison to verify whether the differences have been eliminated, recording a repair success log based on the verification results, or performing a rollback and recording the cause of the exception.

The invention provides a control method and a control system for a welcome lamp of a vehicle. The control method comprises the steps that an unlocking signal sent by a vehicle key is responded, an electronic control unit of a vehicle is controlled to conduct fault self-inspection, and a self-inspection result is obtained; the self-checking result is compared with the fault list list; and in response to the situation that one or more of the self-inspection results exist in the fault list list, controlling the welcome lamp to enter a fault reminding mode, and when the welcome lamp is in the fault reminding mode, projecting fault information corresponding to the self-inspection results existing in the fault list list. According to the control method and control system for the welcome lamp of the vehicle, the fault information in the self-inspection result is displayed in time through the welcome lamp of the vehicle, the fault information can be prompted to a vehicle owner before the vehicle owner starts the vehicle, the vehicle owner can find the fault more timely, and the situation that the vehicle owner cannot start the vehicle when the vehicle breaks down is prevented. A secondary fault possibly caused by driving or starting a vehicle by a vehicle owner and potential safety hazards to passengers are avoided.

The utility model relates to the field of testing devices, in particular to a capacitor testing device capable of performing pre-elimination, which comprises a supporting plate and a conveying belt arranged on the supporting plate, a jig is arranged on the outer surface of the conveying belt, and a trough for matching capacitors is formed on the jig. An electrical property testing station and a charging testing station are distributed on the supporting plate in the rotating conveying direction of the conveying belt, an electrical property testing mechanism and a charging testing mechanism are arranged on the electrical property testing station and the charging testing station respectively, and a defective product discharging station is arranged between the electrical property testing station and the charging testing station. The electrical property testing mechanism is used for testing the electrical property of a base, the defective product discharging station is provided with a defective product discharging mechanism, the defective product discharging mechanism is used for removing defective products detected by the electrical property testing mechanism, and the defective product discharging mechanism further comprises a classified collection assembly. A bad capacitor is prevented from entering a charging test link, so that the accuracy of a subsequent test is ensured.

The present invention belongs to the technical field of low-voltage electrical appliances, and specifically relates to a circuit breaker, comprising an insulating housing (100) and an operating mechanism (200) arranged in the insulating housing (100), a contact system (300), an arc extinguishing system (400), an overcurrent protection system (500), an outlet terminal (600) and an inlet terminal (700), characterized in that an arc channel (800) is arranged at the bottom of the insulating housing (100). The arc extinguishing chamber of the present invention is arranged below, and the arc is ejected from the arc channel at the bottom, eliminating the setting of the arc ejection port at the inlet terminal, and the safety distance can be reduced to zero, which can reduce the space of the switch cabinet, and at the same time shorten the length of the connecting plate and busbar connected to the circuit breaker, thereby reducing the copper consumption of the switch cabinet and reducing the cost.

The utility model discloses an efficient and accurate control system for a new energy commercial truck based on DSP redundancy. According to the utility model, the dual-core DSP is adopted to improve the system performance. One core focuses on wave sending processing, voltage, current and temperature sampling work, operation control algorithm and communication functions; and the other core is used for detection and protection, fault processing, a self-learning algorithm and a fault pre-judgment algorithm. Meanwhile, the CAL coprocessor is used for sharing a signal calculation processing task, remarkably reducing CPU load and improving the overall operation efficiency of the system, and two groups of power modules are mutually backed up, so that when one group of power supply fails, the other group of power supply can be quickly switched, stable power supply of the system is ensured, system shutdown caused by power supply failure is effectively avoided, and the service life of the system is prolonged. Precise detection of three-phase current is achieved through a hardware addition circuit, three sets of data are displayed at the same time and verified mutually, data misjudgment caused by faults of a single collection point is prevented, and therefore reliable data support is provided for precise control of a system.

The invention discloses a reset device for eliminating equipment clamping stagnation workpieces and an eliminating method. The reset device comprises an outer frame, a movement assembly, a traction drag hook and a ratchet wheel and ratchet mechanism. A front-clamping and rear-hanging type mounting structure is arranged on the outer frame and is used for limiting the outer frame in the horizontal direction, the vertical direction and the rotating direction; the moving assembly is slidably arranged on the outer frame and comprises a mounting frame and a traction pin seat; the traction hook is detachably connected with an extension body at the tail part of the execution mechanism through a pin; the ratchet wheel and ratchet mechanism comprises a ratchet bar, a ratchet wheel, stop teeth and a rocker. When the outer frame is installed in place, a pin shaft of the traction pin seat falls into a hook groove of the traction drag hook to form traction fit, the rocker is swung in a reciprocating mode, and through the one-way stepping traction effect of the ratchet wheel and ratchet mechanism, the execution mechanism is driven to overcome spring resistance to move backwards to a standby position, and clamping stagnation of workpieces is eliminated. The device has the advantages of being safe and labor-saving in operation and compact in structure, and resetting operation can be completed in a narrow space.

The utility model discloses a dual power supply switching type power distribution cabinet, which relates to the field of power distribution cabinets, and is characterized in that the power distribution cabinet comprises a power distribution cabinet main body, a dual power supply switching device is arranged at the upper part of the back of the power distribution cabinet main body, and one interface of the dual power supply switching device is connected with an external power supply. One interface is connected with a storage battery on the power distribution cabinet main body, and the storage battery is also connected with an external power supply, so that normal operation of power distribution cabinet equipment can be guaranteed, and chain reactions such as industrial equipment shutdown, business system paralysis, medical equipment interruption and data loss caused by sudden power failure are avoided; and meanwhile, a secondary fault of a regional power system is effectively prevented through a dual-power seamless switching mechanism, and the reliability and the safety of power supply are improved.

The invention discloses a multi-mode switching dual three-phase motor open-phase fault self-healing fault-tolerant control method, and belongs to the technical field of motor control. The fault-tolerant control method comprises the steps that six-phase variables are mapped to different planes, the current of a fundamental wave plane is adjusted through a PI controller, a bidirectional PI controller is adopted to restrain harmonic current, a cascaded wave trap is utilized to enable fundamental frequency components to circulate, and the fundamental frequency components are output to a voltage source inverter through SVPWM to achieve control over a motor. After a fault-tolerant state is entered, stator copper loss and torque output capability of the motor are comprehensively considered, and an optimal operation mode can be automatically switched according to a load condition. The method has the characteristics of no need of fault positioning and consistent control architecture, current reference does not need to be changed through additional operation in the control process, secondary faults caused by wrong reference are avoided, the complexity of control implementation is simplified, the problems of delay and errors in the fault positioning process can be eliminated, and the fault positioning accuracy is improved. And stable operation of the motor can be maintained before and after the open-phase fault.

The present application relates to a kind of precision guiding nest-preventing device and nest-preventing method integrated in sewing machine needle plate, the device is provided with fixed knife and movable knife on the lower surface of sewing machine large needle plate, the movable knife includes hooking part, dividing part, wire container groove and wire hole, cooperates with presser foot, blowing and suction pipe and connecting rod type driving mechanism, through the timing design of "stitching thread - guiding presser - stabilizing thread loop - cutting cleaning - resetting", realizes the precise guidance of thread end, cutting and cleaning.The device can reuse the built-in power of sewing machine, has compact structure and strong adaptability, can completely avoid the winding of starting thread, improve the quality and operation continuity of sewing product, and is suitable for all kinds of sewing machines such as lockstitch machine and pattern machine.

The invention discloses a communication fault intelligent research and judgment and artificial intelligence auxiliary emergency disposal method, relates to the technical field of communication fault disposal, and aims to solve the technical problem that a secondary fault is easily caused due to lack of a plan verification mechanism in current traditional communication fault disposal, and the method comprises the following steps: S300, AI auxiliary decision making and plan generation; s301, combining a historical fault case library; s302, establishing a high-fidelity network digital twin body; and S303, carrying out scientific sorting by using a TOPSIS multi-attribute decision algorithm, and generating a recommended disposal plan. According to the method, the network real-time state in the current fault scene can be completely duplicated by establishing the high-fidelity network digital twinborn body, the network state change after each candidate plan is executed can be simulated in combination with the network state equation, it is ensured that the finally executed scheme has both effectiveness and safety, and the method is suitable for large-scale popularization and application. The problem that a secondary fault is easily caused due to lack of a plan verification mechanism in current traditional communication fault handling is solved.