44results about How to "Realize leakage protection" patented technology

The invention discloses a manufacturing method for graphene heating tube pressure bearing hot water equipment, the hot water equipment and an air coating equipment, and relates to the field of hot water heating equipment. The method comprises the following steps that air is adopted for assisting in pushing a rubber ball, The inner wall is successively made of an insulating heat conduction layer and a graphene conductive heating layer are sequentially manufactured on the inner wall of a stainless steel round tube, a tube body is filled with a refractory silicon carbide material, and a heating tube body is manufactured; wiring assemblies (comprising electrode bars, wire joints, ceramic insulating pads and cover bodies) are mounted at the two ends of the heating tube body; and stainless steelsealing tubes are welded to the two ends of the heating tube body in a sealing mode. A unique process is adopted for manufacturing a heat tube body, airflow generated by the air coating equipment isused as power, the inner side of the stainless steel round tube is filled, then the rubber ball is pushed to roll back and forth in the stainless steel round tube, a uniform coating is formed throughsolidification, and an obtained product has the advantages of reasonable structural design, good heating uniformity, high safety and the like.

The invention relates to the technical field of leakage detection, and discloses a thyristor fault self-test method, circuit, connector and electrical equipment. The technical scheme of the present invention receives the AC synchronous signal of the half-wave rectification circuit through the thyristor test control module, and starts to detect the thyristor when it is judged that the AC amplitude of the AC synchronous signal is less than zero; within the first preset time outputting a turn-on signal to the controlled end of the thyristor to turn on the thyristor to obtain the first target voltage; outputting the turn-on signal to the controlled end of the thyristor within a second preset time to Turn on the thyristor to obtain a second target voltage; calculate the difference between the first target voltage and the second target voltage and compare it with a threshold to determine whether the thyristor fails, and output when the thyristor fails The fault signal warns the user, and realizes the self-testing of the silicon controlled rectifier in the leakage detection circuit, and does not need human-controlled detection.

The invention discloses a protection device for an electrical switch. The protection device comprises a cylinder body and a support rod, a bottom plate is fixed at one side, of the cylinder body through bolts, the internal portion of the body at the other side is sleeved with a protection cylinder, the outer edge of one side, far away from the cylinder, of the protection cylinder is connected witha transparent protection cover through a hinge, a support base is welded and fixed at one side, far away from the bottom plate, of the support plate, a protection cylinder body is movably installed in a mounting cavity arranged at one side, close to the protection cylinder, of the internal portion of the cylinder body, a spacing ring is welded and fixed at one end of a light spring body spring wire, the other end of the spring wire is welded and fixed at the bottom portion of the mounting cavity, a clamping block is connected with the internal portion of a mounting groove arranged close to the bottom portion of the mounting cavity of the cylinder body through a spring. An aluminum current-conducting plate is inlaid and installed in the cylinder, and has a cylindrical shape. According to the protection device for the electrical switch, the internally installed aluminum current-conducting plate guides the leakage to the ground, and the usage safety is high.

The invention discloses a self-adaptive selective leakage protection system and method for a mine low-voltage electric network. The system comprises a microcontroller module, double Ethernet communication circuit modules, an A / D (Analog-to-Digital) conversion circuit module, a leakage testing circuit module, a key operation circuit module, a noise elimination and filter circuit module, an electric network voltage and zero sequence voltage transmission circuit module, a plurality of branch zero sequence current transmission circuit modules, a liquid crystal display circuit module and a leakage tripping output circuit module. The method comprises the following steps: firstly, signal acquisition; secondly, signal collection, storage, analysis and processing; thirdly, manual leakage test existence judgment; fourthly, manual leakage test failure judgment and judged result output; fifthly, insulation parameter measurement and storage; sixthly, electric network leakage judgment; and seventhly, electric network leakage judged result output and leakage protection. The self-adaptive selective leakage protection system is novel and reasonable in design, strong in self-adaptability for different network structures of a mine power supply system, high in leakage detecting speed, reliable and accurate in action and high in popularization and application values.

The invention belongs to the technical field of frequency conversion drives for mines, and discloses a leakage protection method and system for a frequency conversion drive system for mines. The method includes the following steps: S1, four-way synchronous sampling of the three-phase output voltage of the frequency converter and the ground leakage current ; S2, performing common-mode transformation on the measured three-phase voltages to obtain common-mode voltage values; S3, performing Fourier transformation on common-mode voltages and common-mode currents to obtain harmonic voltages and harmonic currents, wherein Fourier The frequency upper limit of the leaf transformation is set as the switching frequency of the frequency converter; S4, all harmonic signals whose voltage amplitude is less than the voltage threshold or the current amplitude is less than the current threshold are discarded; and then among the remaining harmonics, successively calculate the If the phase difference between the harmonic voltage and the harmonic current is within ±10°, it is determined that the resistive circuit is the main component, and the leakage protection signal is output. The invention realizes the function of hierarchical leakage protection and improves the safety and reliability of the variable frequency drive system used in mines.

The embodiment of the invention discloses an electric leakage protection device. The device comprises a voltage acquisition module, a processing module and a switch module. The voltage acquisition module is connected with the ground wire of a power adapter. The processing module is connected with the voltage acquisition module. The switch module is connected with the processing module. The voltage acquisition module is used for acquiring the voltage values of the ground wire of the power adapter and transmitting the voltage values to the processing module. The processing module is used for transmitting control signals to the switch module when the voltage values of the ground wire are greater than a preset voltage value through judgment. The switch module is used for disconnecting the ground wire of the power adapter according to the control signals. Correspondingly, the embodiment of the invention also discloses the power adapter and an electric leakage protection method. With application of the electric leakage protection device, the power adapter and the electric leakage protection method, electric leakage protection of the ground wire of the power adapter can be realized so that safety can be enhanced.

The invention discloses a charger with a built-in electric leakage protection circuit and an electric leakage protection method thereof. The protection circuit comprises a charger body, a relay mechanism circuit, a relay mechanism test circuit, an electric leakage detection circuit, a voltage reduction circuit and an output control circuit, wherein the relay mechanism circuit, the relay mechanism test circuit, the electric leakage detection circuit, the voltage reduction circuit and the output control circuit are installed in the charger body. A power supply is connected to an input terminal of the electric leakage detection circuit through an overload protection circuit. The relay mechanism circuit and the relay mechanism test circuit are connected to the input terminal of the electric leakage detection circuit. The electric leakage detection circuit is connected to an input terminal of a rectification circuit through a first filter circuit. An output terminal of the rectification circuit is divided into two paths. One path of the output of the rectification circuit is connected to the voltage reduction circuit through a second filter circuit. Another path of the output of the rectification circuit is connected to the voltage reduction circuit through a PWM circuit. The voltage reduction circuit is connected to an input terminal of the output control circuit. An output terminal of the output control circuit outputs to electric equipment. When there is an electric leakage phenomenon, the charger can be powered off automatically so that damages to people caused by electric leakage are avoided.

A leakage protection method and device with a fire-neutral identification function, the fire-neutral identification device 1 is used to identify the live wire and the neutral wire of the input power supply, and once it is found that the hot-neutral wire of the power supply is wrongly connected, immediately or indirectly adjust the electrical live wire L The wiring of the neutral wire N of the electrical appliance and the live wire L of the power supply and the neutral wire N of the power supply; or adjust the wiring of the surface leakage signal pickup device 2; or make the main circuit switch K unable to close or disconnect immediately after closing, thus forcing the user Correct the wiring of the power supply neutral line; make the surface leakage signal pickup device 2 always connect the power supply neutral line N and the electrical appliance surface F, and monitor the potential of the electrical appliance surface F to the power supply neutral line N at any time. Once the surface of the electrical appliance leaks, the leakage signal pickup device 2 immediately pushes the electromagnetic tripping device 3 to disconnect the main circuit switch K and disconnect the electrical appliance from the power source. By applying the method and the device of the present invention, the electric appliance can be effectively protected from electric leakage without grounding the electric appliance, and the hidden danger of electric shock accident can be eliminated.

The invention discloses an intelligent storage new energy charging pile, which relates to the technical field of charging pile equipment, including a base, a storage part, a moving part, an electric pile part, a protective part, a storage battery, etc., and the storage part can realize the complete storage of the charging pile , the electric pile parts can be completely stored underground, saving the surface space; when the electric pile parts are stored in the storage parts, the surface moisture can be isolated, self-protection in rainy days is realized, and the waterproof and rust-proof problems are solved. At the same time, power transmission The cable is disconnected from the power supply grid, which realizes complete power failure and eliminates the risk of electric shock; the present invention sets multiple sets of anti-slip rib structures on the outer surface of the equipment. Pedestrians slip and fall when walking on it; the present invention is equipped with multiple protective devices, that is, protective components and multiple shielding shells are provided to realize leakage protection; the storage battery provided by the present invention can realize the protection of the equipment itself when the power grid is cut off. Self-powered battery life.