62results about How to "Disconnect in time" patented technology

The invention discloses a leakage protection plug. Electrical shock hazards caused by failures of electric appliances as well as accidental electrification of a ground wire can be prevented. A first resistance-capacitance element, a second resistance-capacitance element, a photoelectric coupler and a trigger circuit are also arranged on the leakage protection plug, wherein a detection loop which is formed by connecting the first resistance-capacitance element, one input end and the other input end of the photoelectric coupler, and the second resistance-capacitance element in series is connected between the ground wire and a zero wire; a signal output by the photoelectric coupler is sent to the input end of the trigger circuit; and the output end of the trigger circuit is connected with the control end of a driving circuit of an electromagnetic coil.

The invention relates to a method and a device for low-voltage arc fault detection. The device for low-voltage arc fault detection comprises a current transformer, an I / V converting circuit, an operational amplifying and rectifying circuit, a pulse shaping circuit and a micro controller which are sequentially connected. According to the invention, the current transformer detects load current signals, the I / V converting circuit converts the current signals into corresponding voltage signals, the voltage signals are inputted into the operational amplifying and rectifying circuit so as to be amplified and rectified to acquire absolute value signals with an appropriate proportion, the absolute value signals are shaped by the pulse shaping circuit so as to form rectangular pulse signals, the micro controller captures the pulse width time of pulse signals outputted by the pulse shaping circuit and judges whether the current waves at present are arc fault half waves or not through judging whether the pulse width time variation rate corresponding to current half waves of an adjacent period exceeds a threshold value under a corresponding current level or whether high-frequency impulses are captured continuously, thereby being capable of accurately detecting general load arc faults, cutting off the circuit in time, and ensuring the safety in electricity utilization.

The invention discloses a power distribution box with a novel shell structure and belongs to the electric power technical field. The power distribution box with the novel shell structure comprises a frame; the frame is made of an integrated high-strength glass fiber reinforced plastic material; and an electromagnetic shielding layer, a heat insulating layer, an insulating layer and a fireproof layer are arranged in the frame. With the power distribution box with the novel shell structure provided by the above technical scheme adopted, the problems of high possibility of being etched, in capability of shielding interferences of external environment and electromagnetic environment on an intelligent control device exiting on the shell of a traditional power distribution box can be solved, and a power source can be cut off timely when a short-circuit fire occurs, and personnel security can be ensured.

The invention relates to a power switch having an electronic overcurrent protection trigger, which receives the power supply thereof from the power supply network monitored by the power switch, comprising a current sensor, a rectifier, a storage capacitor, and a short-circuit switch, a disconnection unit, a measuring device for measuring the operating parameters of the power supply network to be monitored, an electronic circuit which processes the detected measured values, at least one electromagnetic trigger, controlled by the disconnection unit, for triggering the current-conducting power contacts of the power switch, and an electronic display device for representing the detected and / or processed measured values. It is provided that the display device (6) of the power switch acquires the power supply thereof from the power supply network monitored by the power switch, and an electronic device (10) powered with voltage from the power supply network monitored by the power switch controls the turning on and off of the background illumination (6) of the electronic display device (6), which obtains the voltage supply thereof from the power supply network monitored by the power switch, with the aid of an electronically controllable switch (9) as a function of the measured values detected in a measuring device of the electronic device (10). The invention further relates to a method for controlling the turning on and off of the background illumination of a display device of a power switch.

The invention relates to an electromagnetic switch of a starter. After a starter in the prior art starts, the phenomenon of material adhesion, or contact point fusion welding or the like often happens between a contact element and a binding post of the starter electromagnetic switch and causes burn of the electromagnetic switch. Therefore, the electromagnetic switch of the starter comprises a sleeve element, the sleeve element is fixedly connected with the opposite ends of a shaft rod and a pushing rod of the electromagnetic switch along the axial direction of a shell, at least two slots are formed in at least one end of the sleeve element, elastic hanging arms are formed by the at least two slots in the sleeve element, wherein the number of the elastic hanging arms corresponds to that of the at least two slots, and meanwhile a first joint part and a second joint part are formed on each elastic hanging arm of the sleeve element and are respectively connected with the two opposite ends of the pushing rod and the shaft rod in a buckling mode. Due to the using of the electromagnetic switch, the pushing rod of a movable iron core and the shaft rod of the movable contact element are fixedly connected together relatively easily, and the occurrence of the contact point fusion welding can be effectively avoided.

The invention provides a pre-charging circuit fault detection method. A pre-charging circuit comprises a power supply, a switching device, a pre-charging resistor and a support capacitor. The pre-charging circuit fault detection method comprises the following steps: obtaining a voltage of the support capacitor and a preset voltage threshold corresponding to the pre-charging time at a plurality ofdifferent pre-charging time; and judging whether the pre-charging circuit fails or not based on the voltage of the support capacitor and a preset voltage threshold.

The invention belongs to the technical field of large storage devices, and particularly relates to a large storage device with self-protection function based on a thermal expansion principle, which comprises a processor, a power connection plate is fixedly connected to the interior of the processor, a protection seat is fixedly connected to the interior of the processor, and an air pressure bag isarranged in the protection seat. A telescopic rod is movably connected to one side of the air pressure bag and located in the protection base, conductive columns are fixedly connected to the left side and the right side of the telescopic rod, the outer surface of the telescopic rod is sleeved with a telescopic spring, a moving plate is movably connected to one side of the telescopic rod, and rotating rods are rotatably connected to the left side and the right side of the moving plate. A rotating gear is rotatably connected to one end of the rotating rod in the processor. When the processor isused, the phenomenon of fire caused by continuous increase of the resistance of the processor is avoided, self-protection is achieved, timely disconnection can be achieved, and the phenomenon that electrical components in the processor are burnt out is avoided.

The invention discloses an anti-reverse-connection protection circuit and method for improving safety and a direct-current power grid system. The circuit comprises: a sampling unit which is respectively connected with a DC bus capacitor and a DC bus output side and used for detecting a DC bus capacitor voltage value and a DC bus output side voltage value; a control unit with an input end connectedwith the sampling unit and an output end connected with a switching device, and the control unit is used for controlling the switching device to be switched on or off according to the DC bus capacitor voltage value and the DC bus output side voltage value; and the switching device arranged between a converter and the positive electrode of the DC-bus output side and used for controlling a circuitbetween the converter and the DC-bus output side to be connected or disconnected. According to the method and structure, when the DC-bus is reversely connected, the circuit at the DC-bus output side can be controlled to be disconnected in time, the reverse current is prevented from flowing back to the DC-DC converter to damage internal elements, and the overall safety of the system is improved.

The invention discloses a lithium ion battery which comprises a housing as well as a positive electrode piece and a negative electrode piece located in the housing, wherein a diaphragm is arranged between the positive electrode piece and the negative electrode piece; the negative electrode piece comprises a plurality of side action active sites; the side action active sites are formed by volatilizing volatile substancs having boiling points lower than a preset boiling point in a negative electrode slurry in a process of forming the negative electrode piece; an overcharge gas-generating substance is arranged in the positive electrode piece; and the overcharge gas-generating substance generates gas when a charging voltage of the lithium ion battery reaches a preset charging voltage. According to a technical solution provided by the invention, the lithium ion battery can generate a large amount of gas during overcharging by forming the side action active sites in the negative electrode piece and arranging the overcharge gas-generating substance in the positive electrode piece; the generated gas is timely discharged from a loosened roll core so as to ensure that a current cut-off device in the lithium ion battery can be turned on in time to break the lithium ion battery and improve safety performance of high-rate lithium ion batteries.

The invention relates to a system and a method for testing performance of a fuse of a ring main unit. The system comprises the ring main unit, a releaser, a simulated fuse, a timer and a circuit conduction testing device, wherein a circuit breaker is internally arranged in the ring main unit, the ring main unit is connected with the simulated fuse through the releaser, a triggering end of the timer is arranged at the other end of the simulated fuse, and a cable outlet of the ring main unit is connected with a stopping end of the timer through the circuit conduction testing device. According to the system and the method for testing the performance of the fuse of the ring main unit, which is disclosed by the invention, before the ring main unit comes into use, the off state of the circuit breaker and the time between the disconnection of the fuse and the disconnection of the circuit breaker are tested by combining the simulated fuse and the circuit conduction testing device, so that the safety performance of the ring main unit after the ring main unit is provided with the fuse is comprehensively tested.

A cable safety protection cover capable of emergency disconnection disclosed by the present invention comprises a box body, a joint cavity is arranged in the box body, a branch cable capable of sliding left and right and extending leftwards to the outside is arranged on the left end wall of the joint cavity, and a sealing block closely attached to the branch cable is fixedly arranged on the left end wall of the joint cavity; a main cable extending rightwards to the outside is fixedly arranged on the right end wall of the connector cavity, a cable wiring cavity with a leftward opening is formedin the main cable, and the branch cable is inserted into the cable wiring cavity to be connected with the main cable. According to the invention, the cable can be timely disconnected when the cable joint has a fault, so that further danger is prevented, greater loss is avoided, the alarm device can be started while disconnection is performed, the maintenance personnel can find and repair the maincable more quickly, the outer wall of the main cable can be cleaned regularly, the corrosion to the cable wall due to long-term accumulation of dirt is prevented, and the service life of the cable isprolonged.

The invention discloses an electric automatic protection switch, which comprises a first resistor to a fifth resistor, a first capacitor to a sixth capacitor, a switch, an inductor, a relay, an amplifier, a silicon controlled rectifier and a rectifier. The electrical automatic protection switch induces a current signal in an alternating current circuit through the inductor, amplifies the induced signal through the amplifier and triggers control according to the signal, thereby being high in sensitivity, being capable of timely disconnecting a power supply when electrical equipment has a fault,and having popularization and application values.

The invention provides a gas flow pressure regulation system for natural gas conveying. The gas flow pressure regulation system comprises a gas flow inlet pipeline connected with a natural gas conveying pipeline, pressure regulation pipelines capable of carrying out pressure regulation on natural gases, and a gas flow outlet pipeline capable of conveying the natural gases into a medium-pressure pipeline network, wherein the gas flow inlet pipeline is connected with multiple groups of pressure regulation pipelines in parallel through a gas division feeding cylinder; after the natural gases aregasified, the gasified natural gases enter the gas division feeding cylinder through the gas flow inlet pipeline; the gas division feeding cylinder independently conveys the natural gases into a plurality of pressure regulation pipelines; when parts on one group of pressure regulation pipelines are repaired, other groups can conduct pressure regulation work, pressure regulation efficiency is improved, and pressure regulation stability is guaranteed; through pressure regulation by the pressure regulation pipelines and collection by a gas division discharging cylinder, the natural gases are conveyed to the gas flow outlet pipeline; the gas flow inlet pipeline is provided with a second safety cut-off valve; each pressure regulation pipeline is provided with a first safety cut-off valve; and two ends of a pressure regulator are provided with two groups of safety cut-off valves to guarantee stability for enabling the gas flow to pass and cutting off the gas flow, and a downstream pipeline can be cut off in time when the downstream pipe is subjected to overpressure.

The invention belongs to the technical field of power distribution cabinets, and particularly relates to an anti-fire safety power distribution cabinet. In order to solve the problems that an existingpower distribution cabinet is poor in heat dissipation effect, cannot extinguish a fire automatically and cannot be separated from an external power supply quickly, the following scheme is provided,namely, the anti-fire safety power distribution cabinet comprises a cabinet body, a power distribution module is vertically arranged in the cabinet body, a heat dissipation block is vertically and fixedly connected to one side of the cabinet body, fan blades are arranged on the side, away from the power distribution module, of the center of the top of the heat dissipation block, the centers of thefan blades penetrate through the heat dissipation block through transmission rods, connecting rods are horizontally and rotationally connected to the two ends of the side, away from the fan blades, of the top of the heat dissipation block, belt wheels are fixedly connected to the outer walls of the ends, close to each other, of the transmission rods and the connecting rods, the belt wheels are intransmission connection through a connecting belt, a power assembly is installed at the top of the cabinet body, and lead screws are vertically installed at the bottoms of the ends, away from the heat dissipation blocks, of the connecting rods. The cabinet has the advantages of being capable of efficiently dissipating heat, automatically extinguishing fire in time and quickly realizing separationfrom a power supply.

The invention belongs to the field of devices for blood component acquisition equipment, and relates to an electromagnet with a vacuum adsorption function. The electromagnet comprises a hollow barrelbody. The tail of the hollow barrel body is connected with a hollow rear seat, inner holes of the hollow barrel body and the hollow rear seat are in step shapes, a pressing rod penetrates through theinner hole of the hollow barrel body, the periphery of the portion, in the large hole end of the inner hole of the hollow barrel body, of the pressing rod is sleeved with a coil framework, and an electromagnetic coil is wound outside the coil framework. The head of the pressing rod stretches out of the inner hole of the hollow barrel body, a split washer is fixed to the periphery of the head of the pressing rod, and the periphery of the portion, between the split washer and the head of the hollow barrel body, of the pressing rod is sleeved with a spring. The pressing rod is of a hollow structure, a center through hole of the pressing rod communicates with the inner hole of the hollow rear seat, and the small head end of the inner hole of the hollow rear seat is connected with a vacuumizingdevice. The electromagnet is small in size, flexible and convenient to configure and high in universality, standardization and upgrading and updating of products are easily achieved, and operation and maintenance are facilitated; and the electromagnet independently cooperates with a diaphragm type control box, and the on-off reliability of a pipeline is guaranteed.

The invention discloses a fireproof socket, a socket structure and a charging pile. The fireproof socket comprises a socket base body and a cover plate, and the socket base body is provided with at least one mounting hole and at least two electrode jacks; and the cover plate is provided with at least one mounting column and at least two avoidance holes, wherein the mounting column has a connectionstate of being inserted into the mounting hole and a fusing state of being separated from the hole wall of the mounting hole after being melted; when the mounting column is in the connection state, each avoidance hole is arranged oppositely to each electrode jack, and the cover plate is connected with the socket base body; and when the mounting column is in the fusing state, the cover plate is separated from the socket base body. The fireproof socket provided by the invention can protect a plug and an external circuit connected with the plug when the socket is short-circuited or on fire.

The invention relates to the technical field of electrical equipment, and discloses a power distribution cabinet. The power distribution cabinet comprises a first cabinet body, an isolation transformer positioned in the first cabinet body, a plurality of branch modules which are electrically connected with the isolation transformer, output branch mutual-inductance modules which correspond to the branch modules and induce the output currents of the branch modules, and a monitoring module which is electrically connected with the output branch mutual-inductance modules, wherein the isolation transformer comprises at least one output connection terminal, and each output connection terminal can be electrically connected with the corresponding standby branch module; the monitoring module is provided with signal-wire adapter sockets corresponding to the output connection terminals, each signal-wire adapter socket can be electrically connected with the corresponding standby output branch mutual-inductance module, and each standby output branch mutual-inductance module induces the output current of the corresponding standby branch module. Because at least one output connection terminal is reserved on the isolation transformer, and is provided with corresponding signal-wire adapter sockets, capacity expanding of a power utilization system is convenient, and the cost of capacity expansion is reduced.

The invention discloses a high frequency power supply induction heating timing protection device and a protection method thereof. The timing protection device comprises a power supply anode input terminal P1 and a power supply cathode input terminal P2 which provide a power source for the timing protection circuit, a signal input terminal P3 and a signal output terminal P5 which are taken as the signal input end and the signal output end of the timing protection circuit and are connected at two sides respectively, and a timing protection circuit P4 which comprises an intermediate relay KA and a time relay SJ. The signal input terminal P3 is controlled by the intermediate relay KA and the time relay SJ which sets time, then the outputting is carried out through the signal output terminal P5, the set value of the time relay SJ is adjusted to control the time of energized delay off of a time relay normally closed contact and control the continuous heating time of a high frequency power supply. According to the timing protection device, through adding the timing protection device in a high frequency power supply induction heating circuit, the high frequency power supply can be timely disconnected, and the safety and reliability of equipment operation are improved.

The invention belongs to the technical field of batteries, and particularly relates to a power battery system, an electric vehicle and a design method. Comprising an energy management unit and a power battery unit. The energy management unit comprises a power supply device, a control device and a power distribution device; the power battery unit comprises an energy storage device, a heat management device and a sampling device; the power distribution device is connected in series between the high-voltage interface of the power battery unit and the direct-current bus interface of the electric fitting device; the power distribution device is connected with the control device through a low-voltage wire harness; the control device provides a power distribution device action signal, and the power distribution device acts to realize on and off; the energy storage device is fixed on the heat management device; according to the invention, through integration of the energy management unit and the power battery unit, high integration of a high-voltage system is realized, and weight reduction and cost reduction of a whole vehicle level are realized.

The invention discloses a power distribution box with a novel shell structure and belongs to the electric power technical field. The power distribution box with the novel shell structure comprises a frame; the frame is made of an integrated high-strength glass fiber reinforced plastic material; and an electromagnetic shielding layer, a heat insulating layer, an insulating layer and a fireproof layer are arranged in the frame. With the power distribution box with the novel shell structure provided by the above technical scheme adopted, the problems of high possibility of being etched, in capability of shielding interferences of external environment and electromagnetic environment on an intelligent control device exiting on the shell of a traditional power distribution box can be solved, and a power source can be cut off timely when a short-circuit fire occurs, and personnel security can be ensured.

The invention discloses an electric leakage protection device which is not only capable of preventing the accidents of electric shocks caused by faults of electrical appliances but also capable of preventing the accidents of electric shocks caused by accidental electrification of earth wires. The electric leakage protection device is provided with a first resistor-capacitor unit, an earth wire fault voltage detector and an induction ring; a detection coil of the earth wire fault voltage detector is wound on an iron core of the earth wire fault voltage detector; a detection circuit formed by the first resistor-capacitor unit and the detection coil of the earth wire fault voltage detector which are connected in series is connected between an earth wire and a null line; one end of the first resistor-capacitor unit is connected with the earth wire and the other end is connected with one end of the detection coil of the earth wire fault voltage detector; the other end of the detection coil of the earth wire fault voltage detector is connected with the null line; and the detection ring passes through a closed induction circuit formed by the earth wire fault voltage detector and a zero-sequence current transducer.

The invention provides a SF6 circuit breaker low-pressure automatic disconnecting operating power supply device. A device power supply is connected to a SF6 pressure gauge, a microprocessor, and a controlled switch through wires. The SF6 pressure gauge, the microprocessor, and the controlled device are successively connected through signal lines. An operating circuit power supply, the controlled switch, and a circuit breaker operating circuit are successively connected through operating circuit wires. The SF6 circuit breaker low-pressure automatic disconnecting operating power supply device automatically disconnects the SF6 circuit breaker operating power supply when the SF6 pressure in the SF6 circuit breaker is lower than a blocking value so as to save manpower, is able to disconnect theSF6 circuit breaker operating power supply in time, and is novel and practical in design.

The invention discloses a flexible direct current transmission system and a direct current fault processing method thereof. The system comprises ABC three-phase converter valves, wherein the converter valve of each phase is divided into an upper bridge arm and a lower bridge arm, and the upper bridge arm and the lower bridge arm are both respectively cascaded by a plurality of sub-modules; one side of a power transmission system formed by the ABC three-phase converter valves is connected to an alternating current network, and the other side of the power transmission system is connected to a direct current overhead line; a bleeder resistor R is connected between the power transmission system and the DC overhead line; through adding the bleeder resistor R and controlling the bleeder resistor to put into the system before a direct current breaker is opened, after the direct current breaker is opened, the resistance lasts for some time, and after the fault current is reduced to be lower than an overcurrent threshold value, the direct current bleeder resistor R is disconnected; the method provides an access to a circuit, and the current cannot flow into a capacitor through a diode. The system is simple in structure and the method is simple and effective, and a problem that a direct current fault processing process is easy to cause overvoltage of the capacitor voltage and diode overcurrent can be solved.

The invention discloses a power electronic monitoring system and a working method thereof. The system includes a main unit and a sub-unit. The main unit detects whether there is a person approaching through a microwave module, and sends on-site photos to the sub-unit through a wireless transmission module; The mechanism is respectively connected to the main engine and the electric equipment, and the main engine controls the switch of the electric equipment through the pneumatic actuator. The microwave probe is used to detect whether there is a person approaching, and through the change of the waveform, the data model is designed to effectively calculate the approximate distance of the person approaching and whether the person is walking into the device or away from the device; effectively solve the problem of dangerous points on site and many tigers' mouths , and the problem of fewer full-time guardians prevents the workplace from ignoring some dangerous points that are not very dangerous due to the lack of full-time guardians, reducing the potential safety hazards on the site and preventing safety accidents.

The invention relates to the technical field of power equipment, provides an automatic PT cabinet switching device for multi-path incoming lines, and aims to solve the problems that an existing PT cabinet for multi-path incoming lines cannot automatically switch incoming lines according to actual conditions, a circuit is not disconnected in time, the power supply reliability is low, and the safety cannot be guaranteed. The device comprises a hollow cabinet body and a base installed at the lower end of the cabinet body, wherein a porous partition plate is horizontally installed at the lower portion of an inner cavity of the cabinet body and divides the inner cavity of the cabinet body into an installation cavity and a heat dissipation cavity from top to bottom in sequence; an upper cabinet door and a lower cabinet door are arranged on the front wall, corresponding to the installation cavity and the heat dissipation cavity, of the cabinet body; the side wall of the cabinet body corresponding to the position of the installation cavity is provided with a plurality of wire inlets through which a plurality of inlet wires pass. The device is especially suitable for safe use of the PT cabinet with multiple incoming lines, and has high social use value and application prospect.

The invention discloses a leakage protection plug. Electrical shock hazards caused by failures of electric appliances as well as accidental electrification of a ground wire can be prevented. A first resistance-capacitance element, a second resistance-capacitance element, a photoelectric coupler and a trigger circuit are also arranged on the leakage protection plug, wherein a detection loop which is formed by connecting the first resistance-capacitance element, one input end and the other input end of the photoelectric coupler, and the second resistance-capacitance element in series is connected between the ground wire and a zero wire; a signal output by the photoelectric coupler is sent to the input end of the trigger circuit; and the output end of the trigger circuit is connected with the control end of a driving circuit of an electromagnetic coil.

The invention discloses a leakage protection device which can prevent electric shock accidents caused by faults of electric equipment and also can prevent the electric shock accidents caused by the fact that an earth wire is electrified accidently. The leakage protection device is also provided with a weak current detection sensor, a voltage comparator circuit and a one-way output circuit; an iron core of the weak current detection sensor is wound by a primary winding and a secondary winding; a detection circuit which is formed by serially connecting the primary winding with a current-limiting capacitance resistance element is connected between the earth wire and a neutral wire; a standard voltage obtained from a stable-voltage power supply is input into an input end of the voltage comparator circuit; an output end of the secondary winding of the weak current detection sensor and the other output end thereof are respectively connected with the other input end of the voltage comparatorcircuit and a cathode of the output end of a rectifying circuit; and the output end of the voltage comparator circuit is connected with a driving circuit of an electromagnetic coil through the one-way output circuit.