64 results about "Short circuit" patented technology

Method of protecting a distribution network with a line interconnecting busbars, each busbar being connectable, by means of switching devices adjacent to the busbar, to the line and to loads and/or generators. The method divides the distribution network in multiple protection areas, each comprises a busbar, a protection device and an area controller. Upon a change in connect status of a distribution feeder line, load or generator connectable to one of the busbar, the logic controller in this protection area re-calculates the short circuit level of the areas. Based on the recalculated short circuit levels, the protection settings of the areas may be adapted. The embodiment also provides a system and computer program product adapted to perform the method.

The invention relates to a bistable composite film of polymer dispersed liquid crystals and a manufacturing method thereof. The composite film is composed of two pieces of flexible transparent conducting film and a layer of polymer dispersed liquid crystals, wherein, the two pieces of flexible transparent conducting film are etched with a coplanar conversion electrode; the layer of polymer dispersed liquid crystals is highly active polyurethane acrylic ester; the liquid crystals are nematic phase liquid crystal molecules with large birefringence. When imposing a coplanar horizontal electric field, the bistable composite film of the polymer dispersed liquid crystals is in closed and scattering state and still keeps the scattering state after the electric field is eliminated; when imposing a coplanar comb-shaped electrode short-circuit on an opposite electric field, the bistable composite film of the polymer dispersed liquid crystals is in open and transparent state and still keeps the transparent state after the electric field is eliminated. The bistable composite film of the polymer dispersed liquid crystals has the manufacturing method that: after being mixed, the highly active polymer and the nematic phase liquid crystals with the large birefringence are separated to form the structure that the polymer wraps crystal liquid droplets. The invention uses the simple design proposal and depends on changing the direction of the electric field to realize zero field stability of the polymer dispersed liquid crystals so as to further acquire an electronic-paper technology with better energy conservation; or the bistable composite film of polymer dispersed liquid crystals can be specially applied to the fields of building decoration and jewelry counters and so on as a dimming function film which is clipped in glass.

The invention discloses a maximum power point tracking control method for a photovoltaic inverter. The method includes the steps: S1, allowing the voltage of a solar panel to be periodically disturbed in a fixed direction at a large step V_step_big from an open-circuit voltage point oc to a short-circuit point o, and recording power Ppv and operating voltage Vpv in each disturbance; S2, when MPPT (maximum power point tracking) minimum voltage V_min is disturbed, finishing the fixed-direction disturbance, finding out the maximum value Ppv_max of all the recorded power Ppv during disturbance from the point oc to the point V_min and the corresponding voltage value Vpv_max; S3, periodically disturbing at a small step V_step_small with the Vpv_max serving as an initial point to perform maximum power point tracking; and S4, as for the single-way MPPT, judging whether the operating voltage of the solar panel is smaller than the operating voltage of a bus or not in a scanning or searching state. The maximum power point tracking control method integrates MPPT tracking speed and tracking precision, two-way MPPT can be performed at the same time, and the method is applicable to mounting conditions of various solar panels.

An electrical connector comprises: an insulating housing having an accommodating chamber at a rear portion thereof and a tongue plate protruding forwards from a front portion thereof; a plurality of conductive terminals comprising an upper row of conductive terminals and a lower row of conductive terminals which are mounted on upper and lower sides of the tongue plate respectively, each conductive terminal including a butting portion, a soldering portion, and a bending portion connected between the butting portion and the soldering portion, the butting portions of said upper row of conductive terminals and lower row of conductive terminals being mounted on the upper and lower sides of the tongue plate respectively, the soldering portions of each row of conductive terminals extending from below the rear portion of the insulating housing and being arranged in a front column and a rear column; a shielding casing covering periphery of the insulating housing; and two positioning modules being mounted into the accommodating chamber of the insulating housing and enveloping periphery of the bending portions of said plurality of conductive terminals. The electrical connector can efficiently prevent bending portions of the conductive terminals from further bending and contacting with each other when an external force is applied and thus can prevent the short circuit failure.

The invention discloses a magnetic collector for magnetic pulse forming, and relates to a magnetic collector. The invention aims at solving the problem that the structural strength of a magnetic collector, the insulation capacity of the gap of a longitudinal joint of the magnetic collector, and the insulation capacity between a working area of the magnetic collector and the machined workpiece are reduced due to a rapid temperature rise generated during a continuous magnetic pulse forming process, so that short circuit and structural damages among the longitudinal joint of the magnetic collector, the magnetic collector and the workpiece are caused, and finally the formation production chain is broken. According to the invention, at least one cooling channel ring is machined on a longitudinal arm; each cooling channel ring comprises a plurality of cooling channels; each cooling channel penetrates through an inner sleeve body in the longitudinal length direction and is internally charged with a refrigeration gas or a refrigeration liquid; and every two cooling channels are communicated through an external tube so as to form a serial cooling pipeline or a parallel cooling pipeline; and the Joule heat generated by the magnetic collector during multiple charge-discharge processes is brought away by charging the refrigeration gas or the refrigeration liquid in the cooling channel rings, thus effectively assisting to cool the magnetic collector. The magnetic collector disclosed by the invention is used in a magnetic pulse forming process.

The invention discloses a voltage disturbance generation device which comprises a three-phase rectifier module. The three-phase rectifier module is connected with a three-phase chopper voltage regulation module A, a three-phase chopper voltage regulation module B and a three-phase chopper voltage regulation module C through a DC LC filter. The three-phase chopper voltage regulation module A is connected with a full-bridge inversion module A through a three-phase DC LC filter A; the three-phase chopper voltage regulation module B is connected with a full-bridge inversion module B through a three-phase DC LC filter B; and the three-phase chopper voltage regulation module C is connected with a full-bridge inversion module C through a three-phase DC LC filter C. The full-bridge inversion module A, the full-bridge inversion module B and the full-bridge inversion module C respectively have two paths of output, wherein one paths of outputs are connected with the input end of a three-phase AC LC filter, and the other paths of outputs are mutually short circuited and are connected with the three-phase AC LC filter simultaneously. The problems that continuously-changing output voltage amplitude cannot be realized in a conventional voltage disturbance generation device, and the control difficulty is high are solved; and the voltage disturbance generation device is simple in structure and easily-controlled.

The invention discloses a multi-state switch state collection device and method, and belongs to the technical field of multi-state switch state collection technologies. The invention solves the problems that in the prior art the states of the multi-state switch only can be obtained by changing a hardware circuit. The multi-state switch state collection device and method disclosed by the invention abandon the inherent thinking that the states of the multi-state switch only can be obtained by changing the hardware circuit during current state identification, but directly judge a multi-state switching value signal through the cooperation of the fixed circuit and hardware to obtain the states of the multi-state switch. When in actual application, the method provided by the invention can be implemented by software, in the prior art the hardware can perform online change by a CAN bus, so that the workload is reduced, and the process is simplified. Compared with changing the circuit, it is more convenient to modify the software program, and the accuracy during the collection process can be better ensured. The multi-state switch state collection device and method are applicable to diagnosing open circuit or short circuit, and also applicable to the various fields needing to collecting switch states.

A battery separator is provided which is hardly broken by tension during the manufacture of batteries, is hardly punctured with a plate flash, and is hardly torn off with a plate edge, thereby hardly causing a short circuit. Accordingly, the separator can facilitate the stable manufacture of the batteries. The battery separator is equipped with a fiber sheet containing a polypropylene fiber having a tensile strength of not less than 10 g/d (denier) and a Young's modulus of not less than 800 kg/mm2, said separator having a resistance of not less than 585 gf to puncture by edge, or is equipped with a fiber sheet containing not less than 10 mass % of a polypropylene fiber having a tensile strength of not less than 10 g/d (denier) and a Young's modulus of not less than 800 kg/mm2.

A connector includes a first housing accommodating first terminals, a second housing accommodating second terminals connectable to the first terminals and fittable to the first housing, short-circuit terminals accommodated in the first housing and each having a pair of contact pieces that respectively come in contact with corresponding first terminals adjacent to each other, releasing parts provided in the second housing and configured so as to displace the contact pieces, thereby releasing contacts between the first terminals and the contact pieces, tin plating films formed on respective contact surfaces of the first terminals and the contact pieces coming into contact with each other, and sliding parts provided in the second housing and positioned ahead of the releasing parts in a fitting direction between the first housing and the second housing to displace the contact pieces thereby allowing the contact pieces to slide on the first terminals.

The present invention provides an OLED display substrate and a manufacture method thereof. The OLED display substrate comprises a substrate (10), a TFT (90) located on the substrate (10), a passivation layer (50) located on the TFT (90), a flat layer (60) located on the passivation layer (50), a connecting electrode (80) being located on the flat layer (60) and contacting the TFT (90), an anode (70) being located on the flat layer (60) and covering the connecting electrode (80), an organic emitting layer (71) located on the anode (70) and a cathode (72) located on the organic emitting layer (71); the connecting electrode (80) contacts the TFT (90) via the contact hole (81) penetrating the flat layer (60) and the passivation layer (50); the anode (70) is electrically connected to the TFT (90) via the connecting electrode (80); the short circuit between the cathode and anode of the OLED display substrate can be prevented for avoiding the current concentration and ensuring the normal illumination of the OLED.

The invention discloses a selector circuit with a fixed output state, relating to an integrated circuit technology. A selector comprises a transmission gate, a phase inerter and a PMOS (P-channel Metal Oxide Semiconductor) up-drawing tube. Control bits output by a control circuit are connected with the grid electrode of an NMOS (N-channel Metal Oxide Semiconductor) tube of the transmission gate and used for controlling the grid electrode of a PMOS tube of the transmission gate through the phase inverter, the grid electrode of the PMOS up-drawing tube is connected with the control bits, the source electrode of the PMOS up-drawing tube is connected with a power supply end vdd, and the drain electrode of the PMOS up-drawing tube is connected with the output end of the transmission gate. The circuit disclosed by the invention can be used for ensuring that the output end of the selector is not in an empty level state, but is drawn to the high level through the PMOS up-drawing tube when all output control bits are equal to zero, so that a static short-circuit current is prevented from being generated by a gate circuit connected with the output end; and the circuit disclosed by the invention is low in area overhead, low in requirement for parameters of the PMOS up-drawing tube, capable of reducing the amount of the control bits and eliminating the static short-circuit current, and little in influence to the performance of a chip.

The invention relates to the field of energy storage devices, in particular to a battery pack. The battery pack comprises batteries, a lower box body, a fan, cooling plates and an air duct baffle plate, wherein the lower box body comprises a battery chamber, a bottom groove and a side opening; the batteries are arranged in the battery chamber; the bottom groove is located in the bottom part of the battery chamber and is separated from the battery chamber through a bottom plate of the battery chamber; the bottom plate is made of a heat-conducting material; the bottom groove extends to one side of the battery chamber; the side opening is located at the side part of the battery chamber and communicates with the bottom groove; the cooling plates are arranged in the bottom groove; and the air duct baffle plate covers the bottom part of the bottom groove; and the fan is arranged at the outer side of the side opening. According to the battery pack provided by the invention, moisture or dust can be effectively prevented from entering to cause a short circuit during the cooling process, so that the IP protection grade of the battery pack is ensured.

The invention relates to a major loop structure which is used in a vacuum breaker and comprises a vacuum arc extinguishing chamber, a frame, a dynamic end outgoing line, a static end outgoing line, a dynamic end radiator, a static end radiator, a soft connection fixture block welding component, an upper insulator and a lower insulator. The upper insulator and the lower insulator are fixed and installed on the frame. The static end outgoing line and the dynamic end outgoing line are respectively fixed and installed on the upper insulator and the lower insulator. The vacuum arc extinguishing chamber is installed at the lower end of the static end outgoing line. A conductive fixture block of the soft connection fixture block welding component is connected with the vacuum arc extinguishing chamber. A soft connector of the soft connection fixture block welding component is connected with the dynamic end outgoing line. Equalizing rings are installed between the upper insulator and the static end outgoing line and between the lower insulator and the dynamic end outgoing line. The static end radiator is fixed and installed on the static end outgoing line. The dynamic end radiator is installed on the dynamic end outgoing line. The major loop structure is mainly used in the vacuum breaker with rated voltage between 3.6 and 40.5kV, rated current between 5,000 and 8,000A and rated short circuit breaking current between 63 and 80kA. The major loop structure can meet the 1.1 times of the temperature increase requirement of the rated current and process for more than ten thousand times of on-off operation.

The invention relates to an intelligent meter which facilitates wiring and prevents dampness and a short circuit based on the internet of things. The intelligent meter comprises a meter shell, a protective plate and a lifting mechanism, the lifting mechanism comprises a second hinging unit, a lifting unit, a movable ring, an I-shaped block, a lifting rod, a first connecting rod and a second connecting rod, the meter shell is internally provided with a driving mechanism, two vertical rods and several wiring units, and the driving mechanism comprises a second driving motor, a driving gear, a frame, two driven gears and two fixed blocks. According to the intelligent meter which facilitates wiring and prevents the dampness and the short circuit based on the internet of things, the vertical rods are driven by the driving mechanism to move upwards, so that a fastening unit clamps a signal line on a copper sheet, wiring is completed, and since no external tool needs to be assisted in, wiring is convenient; besides, after wiring is completed, the lifting unit drives the protective plate to rotate downwards and covers the portion above a wiring socket, external water drops are prevented from entering the meter through the wiring socket, the short circuit is not caused, the meter is not damaged, and therefore the safety coefficient of the meter is increased.

The invention relates to the technical field of multi-mechanical devices, in particular to a safe discharge nuclear capacity structure. The discharge nuclear capacity structure comprises a main control room, a wiring board, a storage battery pack and a discharge instrument; the main control room is electrically connected with the wiring board; the wiring board is both electrically connected with the storage battery pack and the discharge instrument; a controllable switch and a plurality of first circuit breakers are arranged between the main control room and the wiring board; the wiring boardand the storage battery pack are provided with second circuit breakers; and the storage battery pack is electrically connected with the discharge instrument through a detachable power-on structure. According to the safe discharge nuclear capacity structure, the wiring board with an operation link is not electrified when the discharge instrument is dismounted during nuclear capacity discharge, so that the possibility that the positive electrodes and the negative electrodes of storage batteries are connected to form a short circuit is avoided, safety accidents are reduced, and the personal safety of maintenance personnel and the equipment safety are ensured.

The invention relates to a clamp-free transformer winding and a binding method thereof. The clamp-free transformer winding comprises a coil with a hollow hole, a pressure plate arranged on the upper portion of the coil and a support plate arranged on the lower portion of the coil. The pressure plate and the support plate are provided with a first upper hole and a first lower hole corresponding to the hollow hole of the coil respectively. The transformer winding further comprises a plurality of binding straps which penetrate through the pressure plate and the support plate to tightly bind the coil, and the binding straps are separately distributed along the circumference of the coil. The clamp-free transformer winding can avoid coil displacement and deformation and is high in short-circuit resistance.

There is provided an armature including a shaft; a core attached to the shaft; a commutator that is attached to the shaft, and includes a plurality of commutator segments; windings that are wound onto the core, and are connected to the respective commutator segments; and a short-circuit member that connects together a pair out of the plurality of commutator segments, and is disposed further to the commutator radial direction outside than an outer peripheral portion of the commutator.

The invention discloses a flame-retardant PVC threading pipe and a preparation method thereof. The threading pipe is made of a flame-retardant PVC material, and the flame-retardant PVC material comprises the following components in parts by weight: 80-120 parts of PVC, 20-30 parts of a glaze, 15-25 parts of light calcium carbonate, 4-6 parts of a stabilizer, 0.1-0.3 parts of stearic acid, 0.1-0.3parts of PE wax, and 8-10 parts of CPE; The preparation method comprises the following steps of: S1. preparation of the glaze, S2. kneading of the glazed flame-retardant PVC material, and S3. plasticized granulation of the glazed flame-retardant PVC material. The glazed flame-retardant PVC material provided by the invention has A-class flame-retardant property, can effectively prevent the flame-retarding and dripping of the threading pipes, has the heat insulation effect, protects the cable inside the threaded pipe from short circuit, and reduces property damage.

The invention discloses an offshore low-voltage ride-through detection method for a wind generating set. The method comprises the following steps of constructing a simulation testing machine system, and calculating corresponding current-limiting reactance and short-circuit reactance according to a to-be-detected voltage drop degree and the simulation testing machine system; simulating no-load operation of the testing machine system; simulating a test point power grid fault, and generating a required voltage drop according to a test standard; the output power of the simulation testing machine system being adjusted to be 10%-30% of the rated power, and a low-voltage ride-through test under a light load being carried out; and S5, adjusting the output power of the simulation testing machine system to 80-95% of the rated power, carrying out a low-voltage ride-through capability test under a heavy load, and recording test data. Based on different operation history and maintenance work of each unit of the wind power plant, similarity between the wind power plant unit and the actual wind power plant unit is calculated, the product identity is improved, an actual state of the actual wind power plant unit is greatly restored, and the method has practical significance and effect on field low voltage ride through detection.