35results about How to "Avoid phase-to-phase short circuits" patented technology

The invention relates to an intelligent and commutation type three-phase current imbalance automatic adjusting device. The device comprises a main controller, a phase converter, a first current transformer and an anti-power-off electrical appliance element combination; the main controller is a control terminal and is electrically connected with an outgoing line side bus of a distribution transformer; and the phase converter is an execution terminal and is electrically connected with a user line and a user load of a three-phase branch through the anti-power-off electric appliance element combination. Relay current zero-crossing cutting and voltage zero-crossing input technologies are adopted, so that it is guaranteed that no arc exists at the moment of cutting and no inrush current exists at the moment of input, the service life of a relay is prolonged, and the operation reliability of the relay is improved; and a magnetic latching relay with a switching state feedback signal output endis adopted, so that the problem of interphase short circuit caused by improper execution of a switching action of the magnetic latching relay is avoided.

The invention discloses a commutation switch type three-phase load imbalance treatment device at least comprising a control part and an execution mechanism. The execution mechanism includes at least one commutation switch. The control part consists of at least one main controller; and a current sensor for detecting current information of a branch grid is also arranged. A signal output terminal of the current sensor is connected with an input terminal of the main controller electrically. And the main controller is connected to a three-phase grid. Each main controller is connected to the at least one commutation switch by wired communication or wireless communication and the commutation switch is electrically connected to the load. Each main controller detects a three-phase unbalanced current, fault information as well as a current phase, and a current load current of the commutation switch controlled by the main controller. On the basis of the unbalanced calculation strategy, calculation is carried out to obtain each switch adjustment target phase and a commutation command is issued. Therefore, large surge current occurrence caused instantaneously during load switching can be avoided; losses resulted from long-term operation of the thyristor can be avoided; and commutation can be carried out without power interruption.

The invention relates to a commutation opportunity determination method and a commutation system for three-phase unbalanced commutation. The method comprises the steps of converting a multi-objectiveoptimization problem into a single-objective optimization model through a constraint method, solving an optimal solution set of the single-objective optimization model in combination with a genetic algorithm and a simulated annealing algorithm, determining an optimal solution in the optimal solution set, determining the optimal solution as a commutation opportunity, and determining a to-be-switched load and a switching sequence thereof based on the commutation opportunity so as to carry out switching. According to the method, multiple targets are converted into one target, the calculation efficiency is improved, the number of generated current optimal solutions is controlled by adjusting breakpoints of constraint conditions, and high objectivity is achieved. Secondly, through combination of a genetic algorithm and a simulated annealing algorithm, a global optimal solution can be rapidly and accurately obtained, safety risks caused by three-phase imbalance are effectively avoided, and the level of power grid operation planning is improved. In addition, three-phase imbalance states of transformers of different types and different capacities can be analyzed, and the application rangeis wide.

The invention relates to an intelligent phase-change switch for preventing inter-phase short circuit before powering and a working method thereof. The three-phase imbalance state is general at present, and there is no effective solution. The technical scheme comprises multiple combination switches K, a control unit and an inter-phase short circuit prevention device, the inter-phase short circuit prevention device comprises a battery and a second relay K2 of which a main contact is connected with the combination switches K, and the battery, the main contact of the second relay K2, one group of combination switch K, a magnetic latching relay K1 coil are connected in series to form an inter-phase short circuit prevention branch; when the combination switch K is on, the magnetic latching relay K1 coil is powered, and the main contact of the magnetic latching relay K1 of the combination switch K is opened. According to the invention, intelligent load unbalance management of a power distribution network low voltage area is realized, insecurity structure that the inter-phase short circuit is a hidden danger in the three-phase imbalance phase-change switch field is changed, and great economic benefit and social benefit are generated.

The invention provides a kinetic energy recovery controller for an electric vehicle, and belongs to the technical field of energy recovery of the electric vehicle. The controller and a motor controller are jointly connected in parallel onto three output wires of a motor stator; a start-stop switch is mounted on a speed regulating assembly of the electric vehicle; during freewheeling, kinetic energy of the vehicle is converted into three-phase alternating current electric energy through the motor; and the controller can automatically select and recover gliding kinetic energy produced when the vehicle speed is close to or exceeds the average moving speed per hour in the city, capacitors are connected in series firstly, three-phase bridge rectification and direct current bridge type series connection boosting are performed, and the energy is fed back to batteries for storage finally. The kinetic energy recovery controller is characterized in that: 1), a control switch power supply adopts kinetic energy power; 2), a three-phase bridge rectification and direct current bridge type series connection circuit is adopted to design kinetic energy rectification and kinetic energy boosting; and 3), the capacitors are adopted to design kinetic energy recovery degree. The controller has simple design and comes onto the market in an embedded module manner, a safe and energy-saving mode is provided for medium-and-high-speed gliding of the electric vehicle in gear, the safety factor and the control performance of the electric vehicle can be improved, and the endurance mileage of the electric vehicle can be increased by about 20%.

This invention relates to a rapid automatic change-over including two AC contactors connected by a mechanical interlocking piece, one is connected with the major supply, the other with the standby supply. It also includes an intermediate relay and two self-locking buttons, the operation coil of the relay is parallel to that of the AC contactor connected with the major supply then to connect with the major supply by a self-locking button, the operation coil of the AC contactor linked with the standby supply is serial with the normally-closed contact of the relay then to be connected with standby supply by the other self-locking button, which can avoid providing power at the same time by two supplies and generating short circuit.

The invention relates to a fully insulated solid ring network cabinet. It includes a cabinet body composed of a transverse support board, a longitudinal support board, an upper panel and a lower panel. The upper cabinet is equipped with a mechanism box and a three-phase independent insulating cylinder. A busbar bushing is arranged on the top of the insulating cylinder. The lower end of the insulating cylinder is provided with a lower outlet sleeve. An umbrella ring is arranged on one side of the insulating cylinder. The umbrella ring is connected to the mechanism box. The lower cabinet is provided with a cable compartment. An isolation fracture is set on the upper panel of the front of the cabinet. Pressure relief windows are arranged on the back panel and the longitudinal support plate of the cabinet. The side panel of the cabinet body is provided with an inspection port. The invention adopts the composite insulation method of epoxy resin and air insulation, which has excellent insulation performance and is safe and stable; an umbrella ring is arranged on one side of the insulation cylinder to increase the insulation strength; the three-phase independent split design structure completely eliminates the possibility of short circuit between phases, and the degree of standardization High, compact structure, small size, easy installation, strong environmental adaptability, environmental protection and no pollution.

The invention relates to an independently-controlled earth leakage protection project management service system comprising a plurality of data servers connected by an internal network, a dual-power supply device, and a plurality of alternating-current earth leakage protection modules. The dual-power supply device consists of an alternating-current dual-power switching module and an inverter; one input terminal of the alternating-current dual-power switching module is connected with a commercial power interface and the other output terminal is connected with the inverter; and power interfaces of all data servers are connected to an output terminal of the alternating-current dual-power switching module by alternating-current earth leakage protection modules. According to the invention, the circuit switching is carried out based on cooperation of the commercial power and the storage battery and thus a power supply that works stably and reliably and has a standby power supply can be provided for the data servers, thereby preventing the data loss. Because earth leakage protection can be provided for each data server separately, the data server can maintain the power off state when an earth leakage phenomenon occurs at the data server, thereby avoiding an accident and preventing the work of other data servers from being influenced. Moreover, the structure of the system is simple and practicability is high.

The invention discloses a distribution network hot-line work robot for three-phase line fire connection and a pose control method therefor. The pose control method for the distribution network hot-line work robot comprises: for a parallel fire connection line and a T-shaped fire connection line, completing the wiring work through the distribution network hot-line work robot. According to the pose control method for the distribution network hot-line work robot, hot-line fire connection of parallel fire connection lines and T-shaped fire connection lines can be achieved, and interphase short circuit can be avoided in the fire connection process.

The invention relates to the technical field of cable maintenance equipment, and particularly relates to a cable terminal insulated fixing device. The cable terminal insulated fixing device is characterized by comprising a supporting part and a fixing part, wherein the supporting part is connected with the fixing part through a connecting rod, the connecting rod is provided with an adjusting mechanism, the fixing part comprises a plurality of fixing rods and adjustable buckles, the adjustable buckles are arranged at end parts of the fixing rods, and the plurality of adjustable buckles are arranged at intervals. The cable terminal insulated fixing device has the advantages of reliable fixation and safe use.

The invention discloses a high-temperature-resistant flexible fireproof cable intermediate joint. The intermediate joint comprises an intermediate joint body used for being connected with a multi-corecable insulation wire core. The intermediate joint body comprises a conductor connecting pipe. The conductor connecting pipe is sequentially wrapped by a silicone rubber self-adhesive tape, a ceramicfireproof mica tape and a silicone rubber insulating pipe from inside to outside. The gaps among the multi-core cable insulation wire cores are filled with ceramic oxygen isolation filling mud, and the periphery of the ceramic oxygen isolation filling mud is sequentially wrapped with a ceramic fire-resistant mica tape, a waterproof insulation composite tape, a sheath tube and a fireproof wrappingtape. The invention provides the high-temperature-resistant flexible fireproof cable intermediate joint. The fireproof performance of the intermediate joint is consistent with that of a connected fireproof cable. The intermediate joint is simple in structure, is smaller in size, is convenient to install, is high in insulating strength, is resistant to high temperature, is good in waterproof performance, is wide in application range, is bendable, is low in cost, and is good in fireproof performance.

The invention discloses a three-phase rapid switching apparatus applicable to a high current. The switching apparatus comprises a switching mechanism; one side of the switching mechanism is connected with a power mechanism; the switching mechanism comprises a shell body, a base, a connecting plate and a transmission shaft; the shell body is arranged outside the switching mechanism, and the base is arranged at one end of the shell body; arc chute sheets are uniformly distributed on the base; the connecting plate is arranged on the inner side of the base; the connecting plate is fixedly connected with contact points; the transmission shaft is arranged in the shell body; a main shaft is arranged outside the transmission shaft; and contacts are connected with the main shaft on one side of the contact points. The switching apparatus can realize rapid switching between three-phase high-current circuits, so that the circuit interruption time can be lowered, possibility of short circuit caused by breaking of electric arc and a condition of inter-phase short circuit caused by program error can be avoided, and high contact reliability and long service life can be realized.

The invention discloses a three-phase line bus and outgoing line fault comprehensive processing device. An outgoing line is provided with a comprehensive switch device, each phase line of a lower port of an incoming line switch of a bus is respectively connected with a thyristor, the other ends of the thyristors are mutually connected in parallel and are connected with a public lead, and when the bus has an interphase short circuit, the thyristors are controlled to be conducted so as to separate the current of an interphase short circuit fault point; and when the interphase short circuit occurs on an outgoing line, the thyristors and the comprehensive switch device cooperate with each other to process an outgoing line fault. The device can comprehensively process bus and outgoing line faults.

The invention relates to a normal pressure sealing switch and a pole column for the same, the pole column comprises a housing, the upper part of the inner cavity of the housing is provided with an arc extinguish chamber, the lower end of the arc extinguish chamber is connected with an outgoing line busbar through flexible connection, the flexible connection and the outgoing line busbar are connected with the static end of an insulation pull rod, and the moving end of the insulation pull rod penetrates out of the housing; the sealing switch comprises a metal box body, three pairs of bus bushings are arranged on a left side plate and a right side plate of the box body, three inverted pole columns and a transmission mechanism of a three-phase circuit breaker are installed on the upper portion of an inner cavity of the box body, the two ends of an outgoing line busbar of each pole column are connected with a pair of bus bushings, and a circuit breaker operating mechanism is installed on the outer side of the box body. The circuit breaker operating mechanism is connected with the three transmission mechanisms, and each transmission mechanism is connected with the moving end of the insulating pull rod of the corresponding pole. The pole can be detachably installed and maintained, the cost is reduced, the size is small, and the reliability is high; the sealing switch is simple and compact in structure, safe to use and convenient to maintain, and modular design can be achieved.

The invention discloses a static contact and a switching device using the static contact. The switching device comprises an insulating shell, a power supply wiring end, a moving contact and static contacts; the static contacts comprise a first static contact and a second static contact, wherein the second static contact is arranged on one side of the first static contact in the width direction of the switching device, and the resistor body is electrically connected with a power supply terminal of the switch device. According to the invention, the other high-resistance circuit is arranged in parallel with the low-resistance circuit, the low-resistance circuit bears normal working current, and the high-resistance circuit reduces the current when the current is broken to generate an arc, so that the arc energy is reduced, and the contact is protected to the greatest extent.

The invention discloses an inter-phase short circuit prevention tool and system for uninterrupted operation of a distribution network, belongs to the field of power cables, and aims to achieve synchronous movement of cables of different phases by using a synchronous movement direction method for the cables of different phases, avoid inter-phase short circuits between the cables and ensure smooth live-line operation. The device comprises an insulating rod; a first area on the insulating rod is connected with a first connecting mechanism; a second area on the insulating rod is connected with a second connecting mechanism; a third area on the insulating rod is connected with a third connecting mechanism; the second area is located between the first area and the third area; and the distance between the adjacent areas is greater than or equal to an inter-phase short-circuit safety distance.