23results about How to "Prevent misoperation" patented technology

The invention discloses a line protection method suitable for a power distribution network containing an unknown load branch, and the method comprises the steps: obtaining three-phase current at two ends of a protection interval, and extracting a positive-sequence component of the three-phase current to obtain a sampling sequence; according to preset windows and step length sliding grouping, calculating waveform similarity of the corresponding windows; solving an energy operator corresponding to the similarity of each window; according to an energy operator, whether a first threshold value is exceeded or not is judged firstly, and if not, no fault exists; and if so, judging whether the front-to-back ratio of the energy operator exceeds a second threshold value, if so, judging the section as a fault section, and otherwise, judging no fault. According to the method, the problem of maloperation of traditional fault protection caused by unknown load branch or distributed new energy input in the power distribution network is solved.

The application discloses a distance adjusting device for a punch press and relates to the technical field of punch press distance adjusting. The distance adjusting device for the punch press comprises a rack, a top column is slidably connected to the rack, the top column is used for being fixedly connected with a lower die, a jacking driving mechanism connected to the top column is further arranged on the rack, and the jacking driving mechanism is used for driving the top column to ascend and descend so as to drive the lower die to ascend and descend; and a locking mechanism is further arranged on the rack and is used for locking the position of the lower die. The application can conveniently adjust the position of the lower die.

An active protection method and system for internal faults in an on-load tap changer of a converter transformer includes: determining the start time of on-load tap changer operation and then extending the time interval; identifying ultra-high frequency (UHF) and high frequency (HF) pulse signals and discharge pulse times exceeding a set threshold within the extended time interval; identifying whether the on-load tap changer is adjusting a polarity-crossing or non-polarity-crossing tap position; determining the internal abnormality of the on-load tap changer based on the UHF and HF pulse signals and their pulse times during operation; and further issuing "general alarm," "serious alarm," or even "protection trip" signals based on the severity of the internal partial discharge detected by the UHF and HF signals. This invention fundamentally avoids false alarms and trips in monitoring or protection devices caused by discharge during normal tap changer operation. Furthermore, it achieves a leap from "passively preventing false operation" to "actively detecting faults," proactively preventing damage to the on-load tap changer itself or even transformer explosions caused by its faults.

This invention belongs to the field of valve devices and discloses a handle valve anti-accidental contact device, comprising: a base fixed to the valve body of the handle valve; a limiting component that extends through the base and slides with the base; and a telescopic component disposed in a horizontal through hole in the base. The extensions have limiting holes that cooperate with the telescopic component to restrict the vertical movement of the limiting component relative to the base. The handle valve anti-accidental contact device of this invention achieves adjustable positioning of the limiting component through the cooperation of the telescopic component and the limiting holes. The precise cooperation between the extensions and the handle provides high limiting stability, effectively preventing accidental operation of the equipment by human error, significantly reducing human error, and ensuring the safe and stable operation of the unit.

The utility model relates to an optical lens structure for multiple light sources, which comprises a cover plate, three groups of optical units which are uniformly distributed along the circumference are fixed on the surface of one side of the cover plate, the three groups of optical units comprise a first light cup, a second light cup and a third light cup, and a detachable mounting ring is arranged on one side of the cover plate where the optical units are arranged. The LED lamp is characterized in that a mounting seat is arranged on the periphery of the mounting ring, the mounting seat is connected with a lamp holder of a light source, three groups of through light inlets are formed in the mounting seat, the light inlets are used for allowing the light source to directly pass through so as to be opposite to different light cups, the size of light spots can be adjusted, a radial pressure applying unit is connected between the mounting seat and the mounting ring, and the radial pressure applying unit is connected with the mounting ring. The radial pressure applying unit is used for applying damping when the cover plate rotates so as to prevent misoperation of the cover plate. The utility model has the following advantage and effect: the size of the light spot can be adjusted more conveniently and quickly.

The invention discloses a constant value remote dynamic operation and maintenance system and method, and belongs to the technical field of intelligent substation operation and maintenance, and the system comprises a cloud cooperative control unit, an edge agent unit and a terminal constant value processing unit which construct a cooperative operation and maintenance architecture through a communication network. Wherein the cloud cooperative control unit is deployed in a regional regulation and control center, the edge agent unit is deployed in a field station, and the terminal constant value processing unit is integrated in a relay protection device. Constant value remote management is realized through a cloud side-end collaborative architecture, operation and maintenance personnel do not need to be on-site on duty, the problem of time consumption of going back and forth on site in a traditional mode is solved, and manpower and traffic costs are reduced; the whole course of constant value modification, checking and tracing is automatic, manual intervention is reduced, the single constant value adjustment period is shortened from several hours to the minute level, and the operation and maintenance response speed is improved.

The present application relates to power distribution system technical field, especially to distributed intelligent power distribution network self-healing control method and system.The method comprises the following steps: step S1, real-time collection of distributed intelligent power distribution network operation data; step S2, fault detection; step S3, parallel protection control; step S4, building fault section positioning model and island division model, and positioning fault section according to fault section positioning model, and dividing island according to island division model; step S5, building double-target optimization model; step S6, solving double-target optimization model according to improved ant colony algorithm, and obtaining optimal switch action table; step S7, safety check of optimal switch action table, and self-healing control of distributed intelligent power distribution network according to safety check result; step S8, feedback of self-healing control situation of distributed intelligent power distribution network.The present application improves fault recovery speed, accuracy and reliability of distributed intelligent power distribution network.

This invention discloses a catalytic oxidation tower for waste gas treatment, comprising a fixed oxidation tower with an outlet pipe connected to its side, a fixed circular hole on its side, a support frame embedded in its top, a fixed base plate installed inside the fixed oxidation tower, and a combustion chamber inside the fixed oxidation tower. This invention, by incorporating an air inlet assembly, a rotating assembly, and an oxidation tower, utilizes their coordinated operation. First, the air pump is turned on, and fresh air from the outside is introduced into the combustion chamber inside the fixed oxidation tower through an inlet bend, a fixed circular pipe, and a connecting metal pipe. The fixed circular pipe and connecting metal pipe at its bottom undergo regular circular rotation, thereby distributing the fresh air output from the connecting metal pipe throughout the combustion chamber and fully mixing it with the fuel, effectively and completely burning the waste gas and further improving combustion efficiency.

The invention provides a detection circuit, a chip and a detection method, and is suitable for the technical field of integrated circuits. The detection circuit comprises a relay outlet loop which comprises a relay and is used for driving the relay to execute a closing action or an opening action under the control of a tripping power supply and a first driving signal; the recovery circuit is electrically connected with an outlet loop of the relay and is used for recovering the coil voltage of the relay to obtain a first recovery signal; and the main control loop is used for controlling the tripping power supply to power on the relay outlet loop, outputting a first driving signal to the relay outlet loop, and detecting the action of the relay based on the first recovery signal. According to the embodiment of the application, the action of the relay can be detected, that is, the action of the CPU trip outlet can be monitored, and by controlling and stoping the outlet, the occurrence of action refusal and maloperation of the outlet can be effectively avoided, and the stability of the action of the outlet is improved.

The invention relates to the technical field of power systems and automation thereof, and discloses a power grid operation data real-time acquisition and decision control method, which comprises the following steps: an off-line modeling stage: executing off-line collaborative modeling, generating model parameters, presetting a control strategy set and a threshold value by a central platform layer, and sinking and deploying to an edge domain control layer; in a real-time acquisition and monitoring stage, an edge domain control layer performs real-time acquisition of power grid operation data, operates model parameters to calculate a transient stability margin and identifies a transient instability mode; in the decision control and response stage, the edge domain control layer executes local transient control according to the margin and reports a feedback packet, and the center platform layer receives the feedback packet and executes center side response and closed loop iteration. According to the method, offline modeling and real-time decision execution of an edge domain control layer are combined, a layered and collaborative control closed loop is constructed, and rapid monitoring, accurate control and self-adaptive optimization of the transient events of the power grid are achieved.

The application provides a leg traction support device with independent adjustable angle and contour, and belongs to the technical field of medical instruments. The traction support device comprises a rotating protrusion rotatably connected to the inner wall of a second rotating groove, an end wall of the rotating protrusion is fixedly connected with a supporting plate, an outer wall of a side of the supporting plate away from the baffle is fixedly connected with a guide plate, and the bottom of the supporting plate is fixedly connected with a first elastic plate on the outer wall close to the sliding plate. In the scheme, the leg traction support device can support the legs of patients through the setting of a calf support assembly, and the system realizes real-time and intuitive display of the size of traction force and traction displacement in the reduction process through the integration of a quantitative monitoring assembly.

This invention relates to the field of electronic circuit breaker protection technology, specifically to an intelligent overload protection and fault diagnosis method and device for electronic circuit breakers. The device includes: a multi-source data acquisition unit, an edge processing unit, a protection drive execution unit, a human-machine interaction unit, a cloud interaction unit, and a power management unit. This invention solves the problem of existing electronic circuit breaker protection schemes considering only a single factor. By using a dynamic thermal balance equation and a modified inverse-time action expression, it comprehensively considers the effects of ambient temperature, conductor aging, power grid harmonics, and load type, reducing protection action errors. In nonlinear load scenarios, the protection action error is small, avoiding false tripping or failure to trip, and balancing speed and power supply selectivity.

The present application belongs to the technical field of switching power supply, and particularly relates to a switching power supply which is ejected when overheating, and more particularly to a suspension type switching power supply and a use method thereof, wherein the suspension type switching power supply comprises a suspension plugboard, and a power supply body with a base in which a slot is formed for the insertion of the suspension plugboard; wherein the suspension plugboard is provided with plug-in blocks on both sides in a sliding manner; the suspension plugboard is further provided with elastic trigger members; and the elastic trigger members are provided with heat shrink members at the positions corresponding to the plug-in blocks. When the temperature of the power supply body rises to exceed the limit working temperature of the power supply body, the heat shrink members automatically shrink, triggering the plug-in blocks to shrink, so that the elastic trigger members are ejected, the power supply body is ejected from the suspension position, physical isolation is achieved, and the power supply body is prevented from continuing to heat up and igniting surrounding equipment after overheating. Meanwhile, a pure mechanical structure is adopted, the aging or malfunction problems of electronic sensors are avoided, and the failure rate and maintenance frequency are reduced.

This invention discloses a multi-branch area protection method for a DC power supply system in extreme scenarios, comprising: S1: determining the main branch unit from each branch unit in the submarine DC power supply network, deploying a measuring device on the main branch unit, and defining the area between every two adjacent main branch units as the protection area; S2: after determining that a fault has occurred, collecting data after the fault. T w Internal main branch unit m and n Initial fault current IFC: i mn and i nm ,in i mn express m Flow direction n The initial fault current, i nm express n Flow direction m The initial fault current was calculated separately. i mn and i nm The average value of the derivative is used to determine the protection zone where the fault is located based on a preset average value threshold; S3: Calculation i mn and i nm The trend of the derivative, and according to i mn and i nm The initial rise time and rise amplitude of the derivative are used to calculate the fault probability, and the fault location is determined based on the trend and fault probability.

The application discloses a high-voltage direct-current valve trigger abnormality detection protection method and system, and relates to the technical field of direct-current control protection. The method comprises the following steps: receiving first state information, second state information, third state information, fourth state information and fifth state information; switching the high-voltage direct-current power transmission system after continuously satisfying the first state information, the second state information, the third state information and the fifth state information for 200 ms; locking the first valve group after continuously satisfying the first state information, the second state information, the third state information, the fourth state information and the fifth state information for 350 ms; and locking the second valve group after continuously satisfying the first state information, the second state information, the third state information and the fifth state information for 500 ms. The application can improve the risk identification and resistance of the direct-current control protection system to abnormal trigger abnormality conditions of the valve group.

This application discloses a method for locating single-phase grounding faults in distribution networks with a high proportion of renewable energy integration, relating to the field of distribution network technology. The method includes dividing the distribution network into multiple feeder monitoring sections, acquiring active power data and zero-sequence differential current data of each feeder monitoring section within a preset time period, constructing a first operational dataset based on the active power data and zero-sequence differential current data, calculating the first operational dataset using a preset ellipsoidal algorithm to construct a dynamic correlation boundary model, processing the first operational dataset based on the model parameters of the dynamic correlation boundary model to obtain the boundary deviation index of each feeder monitoring section at the current time, and determining that a single-phase grounding fault has occurred in the current feeder monitoring section when the boundary deviation index meets preset conditions. This application achieves the technical effect of accurately locating the fault location while adapting to photovoltaic power fluctuations, dynamically adjusting protection boundaries, and reducing costs.

The invention discloses a method and system for opening distance protection of a line protection device, and the method comprises the steps: enabling the line protection device to judge whether the function state of longitudinal current differential protection is effective or not in real time, calculating the differential current in real time if the function state is effective after the protection is started, enabling the distance protection to select the fault phase in real time, and judging the direction, judging whether the differential current of the fault phase is greater than or equal to a threshold, if so, directly opening distance protection, and if not, opening distance protection when the distance protection judgment direction is a positive direction after delaying threshold time; if the function state is invalid, the distance protection selects the fault phase in real time and discriminates the direction, the fault after coincidence and the fault after manual closing are distinguished, and the distance protection is opened under other conditions. The condition of incorrect action of distance protection is effectively prevented.

The invention discloses an energy storage cabinet liquid cooling pipeline dehumidification design scheme and a control method, and relates to the technical field of energy storage cabinet liquid cooling dehumidification, and the method comprises the steps: recognizing a low-temperature surface condition only when a liquid cooling unit is in a refrigeration mode; condensation and removal of water vapor are realized; and the dehumidification function is completed by using cooling capacity resources in the refrigeration stage. Efficient condensation removal of water vapor is achieved, independent dehumidification equipment does not need to be additionally arranged, the cooling capacity resource of the liquid cooling system is fully utilized, and the system cost, energy consumption and space occupation are remarkably reduced; therefore, the reliable, intelligent and low-power-consumption condensation prevention and control are realized in the sealed battery cabin, and the operation safety and the environmental adaptability of the energy storage cabinet are improved.

The invention discloses a closed-loop distribution line single-phase grounding protection method, system and device and a medium, and belongs to the technical field of power system operation and maintenance, and the method comprises the steps: collecting a zero-sequence voltage and a zero-sequence current, and judging whether a line fault exists or not; acquiring three-phase voltage data and three-phase current data in a first time window after detecting that a line fault exists, and extracting a zero-sequence voltage transient component and a zero-sequence current transient component; calculating a zero-sequence voltage phasor and a zero-sequence current phasor through frequency domain transformation; determining a phase difference between the zero-sequence voltage and the zero-sequence current, and judging a fault direction; and controlling to send a control signal to the opposite-end protection device according to the fault direction. On the premise of not depending on the power frequency steady state quantity, the fault direction is rapidly and accurately recognized, accurate positioning and isolation of a fault section are achieved through a double-end cooperation mechanism, and therefore the problems that single-phase grounding protection of a net structure is low in sensitivity and poor in selectivity are solved.

The application discloses a digital power distribution automation terminal, which comprises a cabinet, at least one main control unit arranged in the cabinet, a main control board, a microprocessor, a data storage and a clock chip, at least one analog quantity acquisition unit, a telemetry board, a voltage transformer, a current transformer, a filter circuit and an analog-digital converter, at least one switch quantity input unit, a remote signaling board, an optical-electric isolator, an overvoltage protection circuit and a data buffer, compared with the prior art, the problems of poor anti-interference, single communication and power failure of the traditional terminal are solved, and the reliability and field adaptability of the power distribution network operation are improved.

The invention discloses a single-power-supply radial distribution line section isolation method and device for residual voltage detection, relates to the technical field of power system relay protection, and aims to solve the problems that an existing distribution line section isolation scheme is prone to misoperation, complex in setting and weak in transition resistance resistance when adjacent lines break down. Protection configuration is optimized, in-station protection adopts instantaneous quick-break over-current protection and reclosing, and out-station protection is configured with section protection, including directional over-current protection and directional low-voltage protection in basic protection and directional acceleration over-current protection and directional acceleration low-voltage protection in acceleration protection; when a permanent short-circuit fault occurs in the line, the in-station protection firstly acts to trip and executes reclosing; if the coincidence fails, the fault line starts complete section protection based on a residual voltage detection mechanism, and the sound line does not start protection because the residual voltage is not detected, thereby realizing on-site rapid and accurate fault isolation, avoiding maloperation, simplifying the setting process, and improving the power supply reliability and the anti-interference capability.

The invention discloses a self-adaptive three-side differential protection method and device for an auxiliary power system of a hydropower station, and belongs to the technical field of relay protection of power systems. Aiming at the problems that the existing three-side differential protection is easy to mistakenly operate or reject to operate when a switch separation dead zone fault occurs, and the response delay is caused by depending on manual adjustment of a protection mode in a black start process, the method comprises the following steps: constructing a separation dead zone fault detection criterion by monitoring position signals and current states of a three-side switch in real time; when it is judged that the operation condition is the quantile dead zone operation condition, protection logic is automatically switched from three-side differential motion to two-side differential motion, and a maximum unbalanced current threshold is adopted to calculate a ratio braking equation; and a time delay mechanism is introduced to demonstrate issuing of a tripping instruction so as to realize power utilization system protection. According to the method, dead zone faults can be adaptively identified and rapidly isolated, the power supply reliability and the black-start success rate of a hydropower station auxiliary power system are remarkably improved, existing hardware does not need to be transformed, and engineering implementation is easy.

The invention provides a drivable area ODD platform device based on cloud end-vehicle end cooperation. The drivable area ODD platform device based on cloud-vehicle end cooperation comprises a cloud core layer, a vehicle end execution layer and a tool supporting layer which operate cooperatively. The cloud core layer is used for storage, processing, version management and issuing of non-ODD area data; the vehicle end execution layer is integrated on an intelligent driving vehicle-mounted system and is used for data receiving, real-time calculation, mode switching and early warning prompting; the tool supporting layer provides operation, maintenance and verification tools for the cloud core layer and the vehicle end execution layer. The drivable area ODD platform device based on cloud end-vehicle end collaboration has the advantage of realizing full-process closed-loop management of non-ODD area data from acquisition, processing and updating to execution and feedback by constructing a three-layer collaboration architecture.