433results about How to "Quick protection" patented technology

The invention provides active and passive immunization methods for preventing and treating Clostridium difficile infection, which involve percutaneous administration of C. difficile toxin-neutralizing polyclonal immune globulin, C. difficile toxoids, or combinations thereof. Also provided by the invention are C. difficile toxoids, C. difficile toxin-neutralizing polyclonal immune globulin, and methods of identifying subjects that produce C. difficile toxin-neutralizing polyclonal immune globulin.

Heterogeneous intimate admixtures of sulfated heparinic polysaccharides, well suited for the prophylaxis/treatment of acute thrombotic episodes in a human patient, comprise immixture of sulfated polysaccharides having a weight average molecular weight less than that of heparin and which include from 9% to 20% of polysaccharide chains having a molecular weight less than 2,000 daltons and from 5% to 20% of polysaccharide chains having a molecular weight greater than 8,000 daltons, the ratio between the weight average molecular weight and the number average molecular weight thereof ranging from 1.3 to 1.6.

The invention relates to a lightningproof device, in particular to a puffer arc quenching lightningproof clearance device used in varies voltage grades transmission lines. The puffer arc quenching lightningproof clearance device comprises a conductor connection body, an earthing connection body, a gas generation device, a signal acquisition device, a high-voltage electrode, an earthing electrode, etc. The gas generation device is arranged near an electrode gap formed between the high-voltage electrode and the earthing electrode. The signal acquisition device generates signal after the generation of the arc. The gas generation device is started and therefore generates the airflow capable of blowing out the arc. The invention has the following benefit effects: the device features wide application, light weight, convenient transportation, assembly and disassembly, re-use, lower operation cost as well as environment protection; the device is fast in action, which is able to extinguish the arc quickly and enhance the success rate of recloser; the device is capable of decreasing the trip rate of the transmission line, and protect power facilities, thus being good for the power safety production and improving the power grid reliability.

The invention discloses an interconnection structure and a method for configuring path between the optical networks. The optical network includes a first network and a second network, the first network and the second network each has a number of nodes, a first node of the first network connects with a third node of the second network, a second node of the first network connects with a fourth node of the second network. The method comprises the steps of: setting-up a first path between one of the first node and the second node and another node of the first network; and at least by one link of the link between the first node and the third node and that between the second node and the fourth node, and by the first path, said another node of the first network communicates for path with another node of the second network. By the dual-node interconnection structure and the path configuration shceme of this invention between a ring network and a mesh network, and between mesh networks, the respective advantages of the ring network and the mesh metwork in regard to protection and restoration can be combined effectively, and the existing internetworking schemes between the rings are also compatible.

The invention discloses a fault detection method of a three-phase power supply. The fault detection method of the three-phase power supply includes the following steps: first, rectifying and filtering the three-phase power supply to direct current (DC) bus voltage; second, detecting the direct current (DC) bus voltage, working out ripple voltage delta V; then, judging whether the three-phase power supply is damaged according to the ripple voltage delta V. According to the detection method of the three-phase power supply, abnormal conditions of phase failure, phase voltage unbalance and momentary power failure of the three-phase power supply can be detected accurately, and high power loads which apply the three-phase power supply to supply electricity can be protected rapidly by the fault detection method of the three-phase power supply. If the fault detection method of the three-phase power supply is applied to power-supply protection design of frequency-converted loads, the frequency-converted loads and rectifying circuits and inverter circuits of drive circuit of loads can be protected effectively, probabilities of problems that damage in the frequency-converted loads, the rectifying circuits and the inverter circuits and the like caused by abnormity of power grids can be decreased, circuit design can be simplified and hardware cost can be reduced and reliability of products is enhanced at the same time.

The invention discloses a poweroff detection method of an alternating current power supply and a poweroff protection method of a direct current inverter compressor. A wave form of alternating voltage of the alternating current power supply is detected, and when an absolute value of an amplitude value of the alternating voltage is less than a protection threshold Vp and the duration exceeds the set hold time T, the alternating current power supply is determined to be powered off, wherein when the hold time T is normally greater than the alternating voltage, the experienced dead time from -Vp to +Vp or from +Vp to -Vp before and after zero is t0. The poweroff detection method of the alternating current power supply can be used for detecting the alternating current power supply in real time, detecting the instantaneous poweroff condition of the power supply within short time, quickly reacting to the control of a controlled object, and implementing quick protection. When the method is used for poweroff protection of the direct current inverter compressor, a power supply inverter and the direct current inverter compressor can be effectively protected, thereby improving the reliability of a product and prolonging the service life of the product.

The present invention discloses a method for detection of foot-and-mouth disease virus with chromatographic strip test. Firstly, the nucleic acid sequence of FMDV NSPs is set up, the nucleic acid sequence is amplified by the reverse transcriptase polymerase chain reaction (RT-PCR) method, the recombinant vector is constructed and performed through a prokaryotic system to transform and express the recombinant protein, and the purified recombinant protein is mass produced. Design principles of the method are based on immunoassay and chromatographic analysis. The advantages are easy and simple to handle, no need of elaborate equipment, only one drop of body fluid is required to quickly complete the qualitative test in 10-20 minutes, and operating with a portable POCT (Point of care testing) instrument to complete the quantitative detection within 40-50 minutes.

A voltage-dividing circuit 60, which is formed of serially connected voltage-dividing resistors R1, R2, R3, is disposed between the source terminal S of a power MOSFET 15 and the ground. The divided voltage Va at a connecting point A is applied to one of the input terminals of a comparator 62, while the divided voltage Vb at a connecting point B is applied to one of the input terminals of a comparator 64. The other input terminals of the comparators 62, 64 are connected to the connecting line between an external terminal P4, to which an external resistor 12 is connected, and an FET 30.

The invention relates to an overvoltage protection device and method for the alternating current side of a voltage source converter high voltage direct current transmission system. The overvoltage protective device is connected to two ends of a ground resistor of the converter transformer valve side in parallel and used for acting to lead failure current away, restraining the level of overvoltage of an alternating current circuit I (4) and protecting a converter valve body (9) when overvoltage of a direct current circuit (8) exists due to a fault of the alternating current circuit I (4) or a fault of the direct current circuit (8) or a valve base controller detects the phenomenon that the alternating current circuit I (4) breaks down. The protective device is rapid in action, strong in through-flow capacity, large in absorbed energy, and capable of rapidly protecting the valve body. A control protective device with a complicated structure and complicated functions is not needed. The overvoltage protective device is simple in structure, low in cost and easy to implement, reduces the cost of the alternating current and insulation cost of a converter valve, guarantees safety of the alternating current circuit and the converter valve, improves fault-resistance ability of a converter station, and guarantees safe and stable operation of the voltage source converter high voltage direct current transmission system.

A communication device for interconnection of first and second networks, of which at least the first network is a bidirectional ring network, includes first and second interconnect modules, each such module adapted to receive outgoing data traffic on the first network at a data rate not substantially greater than a predetermined maximum rate for one of the ring directions, and to convey the outgoing data traffic to the second network. When a fault occurs in one of the first and second modules, the other module is reconfigured to receive substantially all of the outgoing data traffic and to convey the outgoing data traffic to the second network regardless of whether the outgoing data traffic is transmitted on the first network in the clockwise or in the counterclockwise direction.

A filter mechanism for unwanted e-mail messages uses a downloadable central source (1, 2) of filter rule data. User reports of received unwanted e-mail messages are relayed back to the central source of the filter data and used to automatically update that filter data. An algorithmic approach to identifying characteristics of unwanted e-mail messages may be applied based upon the preponderance of predetermined words within an e-mail message or characteristics of the addressee list. If an e-mail message is identified as suspect, but not definitely unwanted, then it may be encapsulated within a HTML document and sent to its addressee together with buttons (28) allowing the recipient to provide feedback in the form of votes as to whether or not that email message is unwanted. This recipient feedback may be used to establish a new local rule.

The invention discloses a method for protecting a low-voltage bus of an intelligent substation. The method is achieved through a bus protection device and branch protection measuring and control devices connected with the bus protection device in a cooperation mode, the bus protection device is started through steady current overflowing elements and current variable quantity elements of the active branch protection measuring and control devices, action allowing signals are sent to the bus protection device through power direction elements or the current overflowing elements of branches, and bus composite voltage blocking elements are adopted as the open condition of a bus fault. Internal and external faults of a bus region are judged by the bus protection device in the mode of combining starting signals and the action allowing signals, when the three conditions are met at the same time, the bus fault is judged, the bus protection device acts to remove the faulted bus, and a fault of a segmentation dead region and a fault of a transformer low-voltage side dead region can be judged and isolated. The bus faults with voltage classes of 35 kV and below can be removed fast and accurately, and the method can be directly applied to a digital substation or the intelligent substation.

The invention provides an insulated gate bipolar transistor (IGBT) over-current protection circuit which comprises a current sampling unit, a full-wave rectification unit, a peak value acquiring unit, a current comparing unit, a control unit and an IGBT drive unit. The current sampling unit is used for acquiring a three-phase output current. The full-wave rectification unit is used for respectively converting the three-phase output current to three single-direction currents. The peak value acquiring unit is used for acquiring the largest current in the three single-direction currents and outputting the largest current. The current comparing unit is used for respectively comparing the current output by the peak value acquiring unit with a quick current-limiting protection point and a limit protection point. The control unit is use for enabling the IGBT drive unit to block an IGBT or open the IGBT according to output of the current comparing unit. According to the IGBT over-current protection circuit, after the sampled three-phase output current is subjected to full-wave rectification, the peak value is used as the reference for over-current comparing, and the IGBT can be protected in a quick current-limiting mode and in a limit mode.

The invention provides a spray-coating sealing material for coal rock mass, belonging to the technical field of organic/inorganic compound materials. The spray-coating sealing material for the coal rock mass is a complex of high-molecular emulsion and high-flame-retardant powder materials, without any toxic and harmful substances, free of springback for construction, safe and environmental protective. When sprayed at vertical surfaces and top surfaces, the material does not flow and sag, and is good in overall effect. After curing, the coating has advantages of strong adhesion stress, high tensile strength, large tensile deformation, and excellent sealing performance. The material can be used for surface protection of the coal rock mass, air leakage prevention, gas leakage prevention, and rapid surface protection and moistureproof treatment after tunneling of swelling rock.

Microwave switch (MS) comprising an antenna branch (AB), a receive branch (RB), and a transmit branch (TB). According to one embodiment, the switch comprises a protection circuit (CPL, DTC, CTRL), which upon a high power signal (Dtc_h) being present on the antenna branch effectuates a biasing of semiconductors on both the receive branch (RB) and the transmit branch (TB). According to one embodiment PIN diodes are provided for controlling switching between the transmit and the receiv branch as well as enabling a protective mode, the control being accomplished by selectively biasing respective diodes.

The invention provides a method for pipeline non-excavation restoration and reinforcement with light-cured fiber reinforced composite materials. Light-cured fiber reinforced composite sheet materials are pasted to the inner wall of a pipeline to form a sealed inner sleeve after being cured by ultraviolet irradiation. The invention further provides a pipeline to be restored and reinforced by the above method. According to the restored and reinforced pipeline, a high-strength and high-compactness sealed sleeve is rapidly formed on the inner wall of the pipeline, so that an original pipeline can be effectively restored and reinforced. According to the method, the pasting and curing of the composite materials on the pipeline wall are not influenced by the environment, and are convenient and rapid.