121 results about "Closing loops" patented technology

Methods and apparatus for closing a left atrial appendage are described. The methods rely on introducing a closure tool from a location beneath the rib cage, over an epicardial surface, and to the exterior of the left atrial appendage. The closure device may then be used to close the left atrial appendage, preferably at its base, by any one of a variety of techniques. A specific technique using graspers and a closing loop is illustrated.

The invention relates to a liquid crystal aligning agent containing polyamic acid obtained by reacting tetracarboxylic dianhydride and diamine compound, aminimide polymer of structure obtained by dehydrating and closing loop and mixture of polyamic acid and aminimide polymer of structure obtained by dehydrating, and solution selected from at least one solvent in isoamyl propionate and isoamylisobutyrate. The invention provides the liquid crystal aligning agent reducing recess in print with favorable coating performance even when environmental temperature varies in print.

The invention discloses a disconnection monitoring system of a breaker closing control circuit. The system comprises a DC power supply, a microcomputer protection, measurement and control device, a work position auxiliary contact of a handcart type breaker, an auxiliary contact of a breaker, an energy-storage auxiliary contact of a spring and a closing coil, and whether the closing loop is well can be known timely according to ON/OFF of a tripping monitoring green lamp of the protection, measurement and control device. The auxiliary contacts are used to control the loop, and ON/OFF information that the handcart type breaker is not in the work position, the breaker is in the opening position and the spring does not store energy is transmitted to the microcomputer protection, measurement and control device. When one or multiple external closing conditions of the breaker closing control loop are not satisfied, the DC power supply connects corresponding auxiliary contacts to the microcomputer protection, measurement and control device, and a person on duty can check fault alarm information from the microcomputer protection, measurement and control device. Thus, the fault reason of the closing control loop can be obtained in real time, effective measures are timely adopted, and it is ensured that the breaker is closed rapidly.

A process for synthesizing N-tert-butyl-3-carbonyl-4-a2Q-5 alpha-androst-1-ene-17 beta-formamide, that is phenandrostamine, includes such steps as providing 4-androstene-3, 17-dione as raw material, oxidizing for opening loop to obtain 5, 17-dicarbonyl-3, 5-openloop-androst-3-acid, reacting on ammonium acetate for closing loop to obtain 4-azasterol compound, cyanoalcoholizing, dewatering, Ritter reaction on tert-butanol, hydrogenating and dehydrogenating.

The method for preparation of 3, 3' ,4, 4'-diphenyloxide tetracarboxylic dianhydride belongs to the organic synthetic field. The purpose of this invention is to provide a method for preparation of 3, 3' ,4, 4'-diphenyloxide tetracarboxylic dianhydride, in which its preparation technology is simlple, process flow is short, cost is low, three wastesquantity is few, and its solvents can be retrieved and reused and its products can be easily purified. It includes the following steps: produing the corresponding 4-halogenated potassium phthalate or natrium phthalate by the reaction between 4-halogenated benzoic anhydride and caustic potash or caustic soda; condensing the product of the former step and 4-halogenated benzoic anhydride in the non-polar solvent of dichlorobenzene or trichlorobenzene with organophosphorus compound and/or copper compound as its phase transfer catalyst to obtain monoether anhydride; hydrolyzing the obtained monoether anhydride in the organic acid to prepare monoether acid, afterwards, and closing loop and dehydrating them in the miscible liquids of ethyl acetate and acetic anhydride to prepare purified monoether anhydride. The method for preparation of monoether anhydride can easily control reaction conditions, and is of good stability, especially, is of no strict demand for water.

The invention provides a method for determining the control range of operation voltage of a 500kV bus of an extra-high voltage alternating-current transformer substation. The method comprises the following steps: determining an upper limit and a lower limit of the operation voltage of the 500kV bus which is determined by the operation voltage of a 500kV device; determining an upper limit and a lower limit of the operation voltage of the 500kV bus which is determined by voltage withstand level of an extra-high voltage device; determining an upper limit of fluctuation of the operation voltage of the 500kV bus which is caused by an opening/closing loop of an extra-high voltage line; determining an upper limit and a lower limit of fluctuation of the operation voltage of the 500kV bus which is caused by power fluctuation of the extra-high voltage line; determining an upper limit and a lower limit of fluctuation of the operation voltage of the 500kV bus which is restricted by a special device; determining the control range of the operation voltage of the 500kV bus of an extra-high voltage alternating-current transformer substation. The method for determining the control range of the operation voltage of the 500kV bus of the extra-high voltage alternating-current transformer substation is capable of providing a strong support for arranging an operation manner of an interconnected electric power system and determining voltage controlling measures and has the advantages of strong adaptability and comprehensive consideration factors.

The invention discloses a medium voltage distribution-network looped-network switching operation method. Loop closing load flow calculation, short circuit calculation analysis and the existing site checking phase sequence are carried out before looped-network switching, a non-out-of-limit protection constant value and equipment dynamic and static limits are guaranteed, line phase sequences of looped-network operation is guaranteed, loop closing time is controlled to be minimum, the shorter the loop closing time is, the better the effects are, unforeseen circumstances such as line overload, relaying protection movement tripping, short circuits of closing loop moment power grids, damage to safety of lines and equipment and even equipment damage caused by big circulation are effectively avoided, safe operation of the power grid is guaranteed, operating efficiency of the power distribution network is effectively improved, and adverse effects of construction and overhaul on power supply management and users are effectively avoided.

The invention relates to an epoxy resin and a preparation method thereof. The epoxy resin has the following structural formula (I). The preparation method can adopt a one-step method, namely directlycondensing the mixture of hydroxystyrene/styrene copolymer and epihalohydrin in the presence of alkali to obtain the epoxy resin, and also can adopt a two-step method, namely firstly etherifying the hydroxystyrene/styrene copolymer and epihalohydrin in the presence of catalysts and then closing loop in the presence of alkali liquor. The epoxy resin of the invention has high heat resistance, low dielectric constant and low dielectric dissipation factors, thus being used for manufacturing the resin sheets, resin composition copper foils, the prepregs, the laminate and the printed circuit boards.R is shown in (II), and n and m are natural numbers.

The invention discloses an anti-tripping circuit combining a breaker and relay protection. The anti-tripping circuit combining the breaker and the relay protection mainly comprises an anti-tripping unit, a closing unit and an opening unit of the breaker, and a closing supervision unit, a tripping supervision unit and an anti-tripping unit of the relay protection. The closing supervision unit is in series connection with the anti-tripping unit of the breaker, and is mainly composed of a tripping position supervision relay coil, a breaker normally closed auxiliary contact and a normally closed contact of anti-tripping relay which are in series connection. After a closing supervision unit loop is in series with the normally close auxiliary contact of the breaker and the normally closed contact of the anti-jumping relay, and the breaker closes, the closing supervision unit loop is separated from an anti-tripping unit loop of the breaker to eliminate interferences by the closing supervision unit. At the same time, the closing supervision unit and the breaker closing unit form a loop, and the closing supervision unit can supervise a breaker closing loop, so that an original function is saved. The design of a new loop enables anti-tripping of the breaker and the relay protection to be realized in a same loop, and an anti-tripping function is realized through integrating advantages of the anti-tripping modes of the breaker and the relay protection.

The invention relates to a photo-assisted chargeable lithium ion secondary battery, belonging to a cross domain of a photo-electro-chemical solar battery and a lithium ion secondary battery. The battery consists of an anode, a diaphragm, a cathode, an electrolyte solution and a lead wire. The diaphragm is located between the anode and the cathode; an external circuit between the anode and the cathode is communicated by using the lead wire; and an internal circuit is communicated by using the electrolyte solution to form a closing loop; the anode is a photo-permeability anode used by the photo-electro-chemical solar battery; the cathode is a cathode used by the lithium ion secondary battery; the diaphragm is an oxidation-resistant diaphragm capable of transmitting lithium ions and iodide ions and not transmitting iodide molecules, and the diaphragm is used by the lithium ion secondary battery; and the electrolyte solution is an organic electrolyte solution used by a lithium ion secondary battery containing Lil and/or LiBr. The battery has great stored energy capacity and solves a self-discharging phenomenon. The stored chemical energy can stably exit. Meanwhile, the charging electric energy consumption can be saved by using low voltage to charge under illumination. The photo-assisted chargeable lithium ion secondary battery provided by the invention has the advantages of low cost, simple equipment and good repeatability.

The invention relates to a liquid crystal orientation agent, a liquid crystal display element, a poly-amic acid, a polyimide and compound. A liquid crystal orientation agent capable of forming liquid crystal orientation film with excellent heat resistance, great in printability and coated film thickness uniformity without generating any air bubbles is provided. The polyamic acid includes at least one polymer selected from poly-amic acid and a group including polyimides prepared from dehydrating and closing loop of the poly-amic acid. The poly-amic acid is prepared from reaction between tetracarboxylic dianhydride and diamine of the compound represented by formula (A), wherein R and R represents alkyl groups with carbon number from 1 to 30 respectively.

The invention relates to dibenz, naphthopyrans and dibenz and dibenz spiropyran compound, and the method for preparing the same. Said method comprises: dibenzofuran or naphthofurans reacting with lithium with molar ration being 1:2-2.4, opening loop, reacting with aldehyde, ketone, ester or amide at temperature of -70 to -80 Deg. C, the molar ratio between dibenzofuran or naphthofurans and aldehyde, ketone, ester or amide is 1:0.7-1, dewatering and closing loop, and getting final product. The invention is characterized by cheap raw material, simple process, high productivity, and multiple kinds of products.

The invention discloses an auto-putting-in and auto-recovering power supply system. The auto-putting-in and auto-recovering power supply system comprises a main branch with the electricity supplied by electric supply and an auxiliary branch with the electricity supplied by an engine. The wire outlet side of the main branch and the wire outlet side of the auxiliary branch are connected with the same lower end load, an A-phase wire, a B-phase wire and a C-phase wire of the main branch are provided with a first breaker, and an A-phase wire, a B-phase wire and a C-phase wire of the auxiliary branch are provided with a second breaker. The first breaker is provided with a first closing loop controlling the closing of the first breaker and a first opening loop controlling the opening of the first breaker. The second breaker is provided with a second closing loop controlling the closing of the second breaker and a second opening loop controlling the opening of the second breaker. The first closing loop and the second closing loop are electrically interlocked so that the second opening loop can be started when the first closing loop works, the first opening loop and the second opening loop are electrically interlocked so that the second closing loop can be started when the first opening loop works, and the auto-putting-in and auto-recovering purposes of the two paths of power supply of the electric supply and the electricity generating are achieved.

The invention discloses a protection device and loops thereof detection method under a no-power-failure line condition. The protection device and the loops thereof detection method under the no-power-failure line condition mainly comprises the following steps of carrying out detection of line protection and the loops thereof under the no-power-failure line condition; respectively detecting bilateral line protection and the loops thereof; respectively detecting dually configured two sets of line protection and the loops thereof; comparing the two sets of line protection devices to check current and voltage values; existing a line pilot protection channel to be detected and disconnecting an alternating voltage switch thereof; respectively performing A-phase tripping, B-phase tripping, C-phase tripping and reclosing tests through a method of a test box and the small signal analog quantity; printing a protective action report. According to the protection device and the loops thereof detection method under the no-power-failure line condition, detection of the line protection device and the tripping and closing loops thereof is achieved under the no-power-failure condition, the working time for detection is greatly shortened, and the power failure time is reduced.

The invention relates to a method for analyzing safety of a power system, in particular to a method for analyzing risks of provincial and local cooperated closing-loop operation. The method comprises the following steps: (1) arranging a closing-loop equipment; (2) searching a closing-loop path; (3) checking the closing-loop path; (4) generating and splicing a CIM (common information model) model at the local side, and transmitting the model to the provincial side; (5) obtaining and splicing the CIM model at the provincial side; (6) checking and generating an analyzing model at the provincial side; and (7) analyzing the risks of the closing-loop operation at the provincial side. With the adoption of the risk analyzing method provided by the invention, the provincial and local integrated cooperation calculating services can be provided according to the closing-loop needs dispatched at local, the integrated risk analysis results can be given for dispatching operators to reference, and the safety of the closing-loop operation can be guaranteed.

The invention discloses a circuit breaker integrated test device comprising a voltage test module and a tripping-preventing loop test module. The voltage test module comprises a power regulating module. The access port of the power regulating module is connected with a power supply. A switch is arranged between the power regulating module and the power supply. The out port of the power regulating module is connected with a rectification module which is connected with a circuit breaker loop. A regulating knob is connected on the power regulating module. The tripping-preventing loop test module comprises a public power supply wiring end, a closing wiring end, a tripping wiring end, a switch, a first auxiliary contact, a second auxiliary contact and a counting display screen. The closing wiring end is connected in series with the tripping wiring end. The switch is provided with a first moving contact and a second moving contact. The tripping wiring end is connected in series with the first moving contact so that a tripping loop is formed. The public power supply wiring end is connected in series with the second moving contact so that a closing loop is formed. The first auxiliary contact and the second auxiliary contact are respectively connected with the counting display screen. According to the circuit breaker integrated test device, actuating voltage and the circuit breaker tripping-preventing loop can be tested simultaneously.

The invention relates to a five-prevention electric lockset of a transformer substation or a power plant, particularly to a wireless intelligent omni-sealed five-prevention electric lock comprising a lock body. A single-chip microcomputer, a receiving-transmitting module, an RFID encoding plate, a magnetic latching relay, and a battery for powering the single-chip microcomputer and the receiving-transmitting module are arranged in the lock body. The receiving-transmitting module and the single-chip microcomputer are connected; the output terminal of the single-chip microcomputer is connected with a coil of the magnetic latching relay; and a normally-open contact of the magnetic latching relay is connected in series to an opening-closing loop of an electric operation device. A vibrating sensor is arranged in the lock body and is connected with a starting signal input terminal of the single-chip microcomputer. The electric lock uses the RFID encoding plate as a locking code and after a computer key identifies the lock code, an unlocking command is emitted. The electric lock enables two electric contacts to be connected; and because the two electric contacts of the electric lock are not exposed at the panel, the human direct short circuit phenomenon can be prevented. Therefore, a problem that the original electric lock performs practically no function can be solved.