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 discloses an auxiliary mechanical arm used for live working and a robot. The auxiliary mechanical arm comprises a base, a large arm, a front arm and a gripper. A hydraulic swing oil cylinder is arranged on the base and drives the large arm to rotate by 180 degrees in the horizontal plane. A pitching oil cylinder I driving the large arm to do pitching motion is hinged to the large arm. The front arm perpendicular to the tail end of the large arm is hinged to the tail end of the large arm. The front arm is driven by a pitching oil cylinder II to do pitching motion. The gripper is installed at the tail end of the front arm. The front arm is made of insulating material glass fiber reinforced plastic and can conduct direct live working. The auxiliary mechanical arm comprises the gripper which can be freely opened and closed and can freely conduct grasping.

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 present invention relates to an all-insulation solid ring network cabinet, which comprises a cabinet body formed by a transverse supporting plate, a longitudinal supporting plate, an upper panel and a lower panel. A mechanism box and a three-phase independent insulating barrel are arranged in the upper layer of the cabinet body. The top of the insulating barrel is provided with a bus sleeve. The lower end of the insulating barrel is provided with a lower outgoing sleeve. One side of the insulating barrel is provided with an umbrella ring. The umbrella ring is connected with the mechanism box. A cable chamber is arranged in the lower layer of the cabinet body. The upper panel on the front side of the cabinet body is provided with an isolation fracture. The back panel and the longitudinal supporting plate of the cabinet body are provided with a pressure releasing window. The lateral panel of the cabinet body is provided with an overhauling port. According to the invention, the all-insulation solid ring network cabinet adopts the composite insulating manner of the epoxy resin and the air-insulated, so that the all-insulation solid ring network cabinet is excellent, safe and stable in insulating performance. One side of the insulating barrel is provided with the umbrella ring, so that the insulating strength is increased. Based on the three-phase independent split design structure, the possibility of inter-phase short circuit is completely avoided. The all-insulation solid ring network cabinet is high in standardization degree, compact in structure, small in size, convenient in installation, strong in environment adaptability, environment-friendly and free of 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 discloses a low-voltage busbar clamp. The low-voltage busbar clamp comprises a bus rod; a busbar clamp is arranged at one end of the bus rod while connecting bases are arranged at the other end, wherein the busbar clamp comprises a clamping groove for clamping a busbar; a fastening part for fastening the clamped busbar is arranged in the clamping groove; a connecting port is formed in each connecting base; and an insulating protection layer is arranged on the outer surfaces of the busbar clamp, the bus rod, the connecting bases and the fastening part. By virtue of the low-voltagebusbar clamp provided by the invention, the low-voltage busbar clamp and a busbar in a low-voltage power distribution cabinet can be connected conveniently, and by virtue of the fastening part, stable and reliable connection and fixation can be realized; and by virtue of the connecting bases, a cable and the like, the emergency safeguarding equipment cable can be connected to the busbar in the low-voltage power distribution cabinet in an electrified state.

The invention provides a wheel type bracket for a bypass flexible cable of a power distribution network and a method for fixing a residual cable. The wheel type bracket comprises an insulating bracketand a fixed base, wherein the insulating bracket is detachably connected with the fixed base; when the wheel type bracket is installed, the fixed base is fixed on an electric pole and then the insulating bracket is installed to allow the installation of the wheel type bracket to be easier and more save labor; the insulating bracket comprises a reel, the reel is provided with three annular groovesrespectively configured to allow three single-phase bypass cable to wind so as to avoid that different-phase flexible cables are extruded together and the insulation between phases is damaged due toover-current and overheat to cause interphase short circuit and improve the use safety of the wheel type bracket, and the fixed base comprises a chain cooperated with the electric pole and a locking device configured to lock the chain and the electric pole. The method for fixing a residual cable employs the wheel type bracket to make installation and operation of the wheel type bracket simple andlabor-saving, and the fixing of the residual cable is much safer and more reliable.

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 provides a three-phase load balancing electric meter box, wherein a processor compares the unbalance rate of a phase current and the absolute value of the unbalance phase current with apreset threshold value separately and correspondingly to judge whether the unbalance rate and the absolute value exceed the threshold value or not, if the unbalance rate and the absolute value exceedthe threshold value, switching is executed, a relay set is controlled to act, and a relay set with the minimum three-phase unbalance rate is switched to. Moreover, the three-phase load balance electric meter box has various switching combination forms, so that the optimal operation mode can be pre-judged in advance, and blindness in the adjustment of other adjustment modes is avoided. The processor evaluates all possible operation modes through the high-speed operation and selects an optimal mode for investment, so that the selection of the device is optimal. The processor can obtain a presetvalue or an optimal switching strategy in advance, and also can set an adjustment reference value for switching, thereby avoiding the frequent adjustment. The commissioning phase can be selected according to the comprehensive evaluation of historical data and the like, so that the switching frequency is remarkably reduced. And through a two-phase switching method, the number of executive components and the operation burden of the processor are reduced.

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.

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 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 discloses a capacitive type isolated bus with two shielded ends, aiming at solving the problems of complicate process and high manufacturing cost of the high-voltage capacitive type isolated bus in the prior art. The capacitive type isolated bus with two shielded ends, provided by the invention, mainly comprises a current guiding body, rigid isolated barrels, fixed flanges and capacitive type isolators, and is characterized in that the current guiding body is arranged at a central position and two ends of the current guiding body are respectively provided with a plugging terminal with a plugging slot; the plugging terminals at two ends of the current guiding body are respectively and fixedly connected with one rigid isolated barrel; the other terminal of each rigid isolated barrel is respectively fixed on one fixed flange; the capacitive type isolators are wrapped outside the rigid isolated barrels and the current guiding body by using organic isolated tapes; and an innermost screen of a capacitive screen of each capacitive type isolator is equipotential to the current guiding body and an outermost screen of the capacitive screen of each capacitive type isolator is reliably grounded through the corresponding fixed flange. By adopting the capacitive type isolated bus with two shielded ends, provided by the invention, an isolated shielding type intermediate connector is not needed, the capacitive type isolated bus has the advantages of simple structure, low manufacturing cost and mounting convenience, is subjected to isolated shielding in a whole course, and can be detected at a factory; and the current guiding body is connected in a plugging manner so that the bus is regulated freely in a manner of expanding under heating and contracting under cooling.

The invention discloses a three-phase magnetic latching relay with symmetrically distributed input and output. The structure of the three-phase magnetic latching relay comprises three parts: a housingpart, a control loop part, and a magnetic circuit system part; the housing part consists of a housing, an upper cover, and a lower cover. The control loop part comprises an L1 control group loop, anL2 control group loop, an L3 control group loop and a mutual inductor; each set of control loop consists of a movable contact, a movable spring seat, a movable reed, a static contact and a static spring seat. The magnetic circuit system part comprises a coil rack, a support, a pushing sheet, a magnetic steel assembly, an enameled wire, an iron core and a yoke. A traditional interval type wiring three-phase electric meter connecting terminal is inconvenient to connect if a novel electric meter design scheme is adopted. Symmetrical wiring three-phase electric meter connecting terminals are adopted, so that the novel electric meter is adopted to be matched with the symmetrical three-phase magnetic latching relay, the design scheme is convenient, materials are saved, and cost is greatly reduced.

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 is a dynamic processing method for a single-phase transition resistance grounding fault in a distribution network. When the neutral point displacement voltage of the power grid is abnormal, firstly compare the magnitude of the neutral point displacement voltage of the power grid, and if it is, it is judged as a low-resistance grounding fault. The phase voltage ratio method can be used to determine the ground fault phase, and the current of the fault point can be transferred by closing the ground switch of the fault phase to ground. At that time, it was a high-impedance ground fault, and the phase voltage ratio method cannot be used to determine the ground fault phase, and the method of closing the ground switch of the fault phase to the ground cannot be used to deal with single-phase ground faults, but directly enters the line selection process, and real-time Detect the displacement voltage of the neutral point of the distribution network, track the development of the fault, and carry out dynamic processing of the fault; once the fault develops, immediately use the phase voltage ratio method to determine the phase selection method of the ground fault, and start the fault current transfer device to transfer the fault current to the ground phase. The grounding switch is closed to the ground to divert the current at the fault point and deal with the single-phase grounding fault of the distribution network.

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 a three-phase magnetic latching relay whose input and output are symmetrically distributed. Its structure includes three parts, namely a housing part, a control circuit part and a magnetic circuit system part. The housing part consists of a casing and an upper cover. , lower cover; the control circuit part includes L1 control group circuit, L2 control group circuit, L3 control group circuit, mutual inductor, each group of control circuit consists of moving contact, moving spring seat, moving reed, static contact , Static spring seat; the magnetic circuit system part includes a coil frame, a bracket, a push piece, a magnetic steel component, an enameled wire, an iron core, and a yoke. It is inconvenient to connect the traditional spaced three-phase electric meter connection terminal if the new electric meter design scheme is adopted; but the present invention adopts the symmetrical three-phase electric meter connection terminal, and adopts the new electric meter to match the symmetrical three-phase magnetic latching relay of the present invention Reasonable, convenient design, saving materials and greatly reducing costs.

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.

The invention discloses a washing machine, a motor for the washing machine and a stator assembly thereof. The stator assembly comprises a stator core, a stator winding, multiple pieces of insulating slot papers and at least one insulating plug-in, wherein the stator core is provided with multiple stator teeth and multiple stator slots, the multiple stator teeth are arranged at intervals along thecircumferential direction of the stator core, and the stator slots are defined between two adjacent stator teeth; the stator winding is wound on the multiple stator teeth; the multiple pieces of insulating slot paper are arranged in the multiple stator slots in a one-to-one correspondence manner, and each piece of the insulating slot paper is located between the stator tooth and the stator winding; and the at least one insulating plug-in is arranged at an opening of the stator slot and used for closing at least part of the opening, the side, which faces towards the stator tooth, of the insulating plug-in is provided with a groove, and a part of the insulating slot paper is arranged between the stator tooth and the insulating plug-in and located in the groove. The stator assembly of the motor for the washing machine in the embodiment of the invention avoids wind noise generated by the rotation of a motor rotor, improves the safety performance, and is simple in structure, convenient to manufacture and good in user experience.

The invention discloses a phase-change switch structure. The phase-change switch structure comprises a contact system, wherein the contact system comprises six static contacts and one movable contactassembly; the movable contact assembly comprises a movable contact and a rotating shaft connected with the center of the movable contact; the six static contacts are distributed in a circumferential equidistant manner with respect to the center of the movable contact; the six static contacts include a first input static contact, a second input static contact and a third input static contact for being connected with three phase lines with three-phase electric power respectively as well as a first output static contact, a second output static contact and a third output static contact used for being connected with a load; the first output static contact, the second output static contact and the third output static contact are opposite to the first input static contact, the second input staticcontact and the third input static contact; and the two ends of the movable contact are in movable contact with the six static contacts. The phase-change switch structure is safe and reliable, and can avoid the situation of interphase short circuit.