165results about How to "Realize engineering application" patented technology

The present invention discloses a glass scintillator for detecting thermal neutron and its preparation method. It is characterized by that it uses Ce3+ as lithium-6 glass scintillation material, the lithium element is existed in the glass scintillator in the form of lithium-6 isotope, and has the action of producing nuclear reaction. The luminous efficiency of glass scintillator obtained by making raw materials undergo the three steps of preparing material, melting and annealing is 12% of NaI(T1), strongest emission wavelength is about 400nm, UV cut-off wavelength is 360nm, luminous decay time is about ns and thermal neutron detection efficiency is about 90%. Said glass scintillator mainly is used for detecting thermal neutron, and also can be used for detecting alpha ray, beta ray and gamma ray, etc.

The invention discloses a zero-valent iron carrying nanometer composite resin for catalytic degradation of pollutants and a preparation method thereof. The zero-valent iron nanometer composite resin has the following structures: (1) the carrier of the nanometer composite resin is an ion-exchange and adsorption resin having alkali functional group; (2) the internal and external surfaces of the carrier support nanometer sized zero-valent iron series inorganic materials. The zero-valent iron nanometer composite resin is prepared by leading FeCl4 ion onto the internal and external surfaces of the resin by ion-exchange, deoxidizing the FeCl4 ion into nanometer zero-valent iron and obtaining the zero-valent iron carrying nanometer composite resin by washing and drying under the protection of N2. The composite resin integrates the Donnan preenrichment effect of the resin on the inorganic anionic pollutants in the water body and the high-efficient catalytic degradation effect of the nanometer zero-valent iron on the environmental pollutants, overcomes the shortcomings of easy conglobation, unstable chemical property, small particles and big loss of the pressure head of the nanometer zero-valent iron particles and has fast, high-efficient and low-cost catalytic degradation toward the micro-pollutants in the environment.

The invention discloses a method for culturing granular sludge by shortcut denitrification. The method comprises the following steps of putting inoculated sludge into an aerobic reactor, and performing enrichment culture on denitrifying sludge by using high ammonia-nitrogen low COD wastewater; then, performing secondary enrichment screening by wastewater simultaneously containing nitrate nitrogen, nitrite and COD in a facultative anaeration reactor, and performing third enrichment screening by wastewater only containing nitrite and COD; and finally acclimating by wastewater simultaneously containing ammonia-nitrogen, nitrite and COD to obtain the denitrified granular sludge with high removal rate on the nitrite when various forms of nitrogen coexist commonly. By the method, the denitrified granular sludge which can survive in a complicated environment and is capable of effectively treating wastewater nitrous nitrogen under proper condition can be obtained, and the shortcut nitrification-denitrification process can be truly applied to actual engineering conveniently.

The invention provides a leaching apparatus for arsenic-contaminated soil and a treatment method for the arsenic-contaminated soil. The leaching apparatus comprises a leaching container. The leaching container comprises, from top to bottom, a leaching liquid storage chamber, a first filter layer, an arsenic-contaminated soil layer, a second filter layer, a barrier material layer and a third filter layer. The bottom side surface of the leaching container is provided with a lower-end water outlet, and the top side surface of the leaching container is provided with an upper-end water outlet; the lower-end water outlet is connected with the upper-end water outlet through a connecting pipe; a pump is arranged at the middle of the connecting pipe to pump a leaching liquid flowing out from the lower-end water outlet to the upper-end water outlet; and a valve is arranged at the upper-end water outlet. The leaching apparatus employs a single loop structure, and separation of heavy metals from the soil and purification and cyclic utilization of the leaching liquid are realized through effective combination of a soil leaching system, a leaching liquid safe treatment system and a leaching liquid circulating system.

The invention discloses a MIMO radar waveform optimization method, used to improve parameter estimation performance of a MIMO radar system under a condition that target prior information exists in a clutter scene. Implement method thereof comprises: firstly, establishing a MIMO radar signal model, and deriving Cramer-Rao bound (CRB) of an unknown parameter based on the model; based on a Trace-Opt criterion, minimizing trace of the CRB, establishing a waveform optimization model; and based on a diagonal loading (DL) method, relaxing a nonlinear optimization problem to a semi-definite programming (SDP) problem, to obtain efficient solution of the optimization problem, so as to improve parameter estimation performance of the system. Compared with an uncorrelated transmitted waveform and a non-prior scene, the method can obviously improve system parameter estimation performance.

The invention discloses a geographical coordinate projection transformation method. The method comprises the steps of extracting the coordinates of a vertex of a transformation area, calculating the coordinates of a homonymy point of the vertex under a target projected coordinate system, setting up a projection transformation linear system of equations, and calculating the coordinates of elements in the projection transformation area under the target projected coordinate system according to the projection transformation linear system of equations. Meridians and latitude lines in a small local area are represented through straight lines respectively, spherical surface calculation is converted to planar calculation, the calculating speed of geographical coordinate projection transformation can be increased, error control can be achieved by controlling the size of the local area, and the requirements of actual application can be met with little cost, wherein the actual application relates to mass data transformation, and the requirements for transformation precision and transformation speed are high.

The invention relates to a treatment device and method for simultaneously removing high-concentration SS, fluoride, sulfate, arsenate and COD in desulfurization waste water. The treatment device is characterized in that an overflowing port of a settling pond is connected with a first delivery pump through a pipeline, a first-level defecator stirring device is installed on a first-level defecator, and a second delivery pump is connected with a third reaction tank through a pipeline. The treatment method includes the steps that the desulfurization waste water enters the settling pond for primary settling, and then outlet water sequentially enters a first reaction tank and a second reaction tank to be subjected to a chemical-coagulating sedimentation reaction and then enters the first-level defecator for solid-liquid separation; supernate is introduced into the third reaction tank, mixed liquid after the reaction sequentially enters a flocculation tank to be subjected to a flocculation reaction and a second-level defecator to be defecated and concentrated; the supernate is introduced into a filtering device to be filtered, and the pH value of output water is adjusted to be 6-9. The high-concentration SS, fluoride, sulfate, arsenate and COD in the desulfurization waste water are effectively and simultaneously removed.

The invention provides a protection welding technique for melting-pole inert gases (MIG) of titanium and a titanium alloy. A welding process adopts a wire sending mode of a pushing and pulling type, a melting drop transition form is short circuit transition or jetting transition, a welding electric arc is combined by mutually switching a pulse and an electric arc of continuous combustion, and a welding position and a corresponding welding rule are selected properly according to different welding work conditions. A welding joint is designed into a butt joint welding seam with a padding plate or without the padding plate, and a T-shaped joint angle welding seam and a butt joint welding seam in an angle joint form. The welding groove design is carried out correspondingly. Incline angles theta and omega of the welding seams relative to a welding gun are controlled. High-purity argon gas or helium and argon combing protection are adopted in the welding process to realize the welding. The technique solves the problems of controlling the MIG welding process of complicated structural parts of large thin walls of the titanium and the titanium alloy and relevant technical problems, realizes the engineered application to the MIG welding of the titanium and the titanium alloy, improves the welding production efficiency by 1 to 3 times, and improves the comprehensive quality of the welding seams and welding components.

The invention discloses a thermal barrier coating with a thermal barrier and an anti-CMAS corrosion attachment and a preparation process of the thermal barrier coating. The thermal barrier coating isof a double-layer structure and comprises the anti-CMAS corrosion adhesive layer and a thermal insulating layer. The thickness of the thermal insulating layer close to a base body is 30%-60% of the total thickness of the thermal barrier coating, and the thickness of the anti-CMAS corrosion adhesive layer close to thermal current is 40%-70% of the total thickness of the thermal barrier coating. Thethermal insulating layer and the anti-CMAS corrosion adhesive layer are both formed by stacking sheet layers. The sheet layers of the anti-CMAS corrosion adhesive layer can be peeled layer by layer.In the service process of the coating, by means of the large stacked sheet layers, the permeating path of CMAS is obviously increased, the speed of permeating along surface defects of the CMAS is delayed, and the anti-CMAS corrosion capacity of the coating is improved; and on the other hand, the film thermal mismatch stress generated by the temperature change can trigger local layer peeling of theanti-CMAS corrosion adhesive layer, therefore CMAS sediment adhering to the surface of the thermal barrier coating can be removed so that air film hole blockage caused by deposition, near air film holes, of the CMAS can be removed, and the long-time service stability of aero-engine hot end metal components can be greatly improved.

The present invention discloses a method for preparing a fluorapatite ceramic solidified body. The method is characterized by comprising the steps of: taking and mixing 23-76 wt.% of calcium pyrophosphate, 8-26 wt.% of calcium fluoride, 0. 02-52wt.% of samarium oxide (europium oxide, gadolinium oxide), 0-15 wt.% of sodium carbonate, 0-16 wt.% of silica to obtain a mixture; grinding, drying, granulating, molding, discharging rubber and conducting vacuum hot pressing sintering on the mixture to obtain a fluorapatite ceramic solidified body. The method not only utilizes the phosphorus in high-level radioactive waste in a recycling way, but also can address the problem of low solubility of phosphorus and minor actinides nuclide in glass solidified body. The fluorapatite ceramic cured body prepared by the invention has excellent preparation geological stability, irradiation stability, mechanical stability, chemical stability and thermal stability, and can be used as a ceramic solidified body for safe treatment of minor actinides high-level radioactive waste with high toxicity, long half-life period and strong radioactivity.

The invention discloses a preparation technology of an anti-sintering dual-die composite structure thermal barrier coating. The preparation technology includes the steps that first, metal is depositedon a substrate to form a metal bonding layer; second, first thermal barrier coating material powder and second thermal barrier coating material powder are deposited on the metal bonding layer in an alternative layered mode through a thermal spraying method to form a composite layered structure thermal barrier coating; and third, a plurality of longitudinal holes are formed in the composite layered structure thermal barrier coating through a strong flow impingement cooling pretreatment technology, and accordingly the dual-die composite structure thermal barrier coating can be obtained. According to the dual-die composite structure provided by the invention, the multiple holes perpendicular to the heat flow direction are spontaneously formed on service, high-strain tolerance is maintained and thus the characteristics of being resistant to sintering and long in service life are achieved.

The present invention discloses a Ti2AlC / TiAl-based composite and a preparation method thereof, firstly TixAly powder is prepared by reaction of Ti / Al, the TixAly powder and Ti3AlC2 powder are mixed evenly by wet milling, then dried and filled into a mold for vacuum hot pressing curing to obtain the Ti2AlC / TiAl-based composite. The Ti2AlC / TiAl-based composite comprises matrix phase TiAl and reinforcing phase Ti2AlC, Ti3AlC2 is completely converted into the Ti2AlC, and the Ti2AlC / TiAl-based composite is free of impurity phase TiC and the like. The preparation process is simple, the sintering temperature is low, production cost is low, the obtained composite is fine in organization and remarkable in toughening effect, and can greatly improve the strength and toughness of the TiAl intermetallic compound. The preparation method is suitable for industrial production, the obtained Ti2AlC / TiAl-based composite is expected for using in the manufacture of aircraft engine components and ultra high-speed aircraft wings and housings.

The invention discloses an intelligent control method and an intelligent control system for an offshore petroleum platform power grid, and relates to a method and a system for monitoring an offshore oilfield group power grid. The method comprises that a wide-range intelligent monitoring system and a multi-target coordinated optimization operating system are arranged; the multi-target coordinated optimization operating system carries out restricted non-linear optimization on corresponding targets on the basis of synchronous data collected by the wide-range intelligent monitoring system; and an intelligent self-healing control system carries out control strategy decision making according to optimization results and automatic control on relay protection, switches, automatic safety devices and automatic adjusting devices. The system disclosed by the invention comprises the wide-range intelligent monitoring system, a dynamic early warning system, the multi-target coordinated optimization operating system and the intelligent self-healing control system. The intelligent control method and the intelligent control device solve a problem that the safety and the economy of the power grid cannot be precisely monitored and evaluated because of incomplete information, varied operating modes and uncertainty of model parameters, and problems of coupling of multiple control targets and coordination of multiple control measures of the offshore oilfield group power grid in a complex operating environment, thereby realizing comprehensive regulation of reactive power and active power of the power grid, and achieving an objective of automatic optimization operation.

The invention discloses a carbide-reinforced Mo2NiB2 metal ceramic and a preparation method thereof. The preparation method comprises the following steps: proportioning Mo powder, B powder, Ni powder and graphite powder in a Ni:B:Mo:C mass ratio of (21-45):6:(44-63):(5-10), filling the Mo powder and graphite powder into a ball milling tank, charging inert gas, carrying out mechanical alloying, adding the B powder and Ni powder, and uniformly mixing to obtain mixed powder; and putting the mixed powder into a mold, carrying out compression molding compression molding to obtain a billet, putting the billet into a vacuum sintering furnace, carrying out nonpressure sintering at 1200-1400 DEG C, and carrying out furnace cooling to obtain the carbide-reinforced Mo2NiB2 metal ceramic. The method has the advantages of short preparation period, simple procedure, high material utilization ratio and low cost. The prepared carbide-reinforced Mo2NiB2 metal ceramic has the advantages of compact structure and favorable mechanical properties, and has favorable application prospects.

A method for preparing porous fluorapatite ceramic adsorbing radioactive nuclide is characterized by including: using the materials in percent by weight: 50-80% of calcium pyrophosphate, 4-26% of calcium fluoride and 16-45% of calcium carbonate, and mixing, ball-milling, drying, press-forming, calcining, grinding, and screening to obtain fluorapatite powder; mixing the fluorapatite powder with polyethylene glycol solution, methyl cellulose solution and hydrogen peroxide solution, and performing microwave assisted pore-forming, drying and the like to obtain a porous fluorapatite ceramic blank; preparing porous fluorapatite ceramic adsorbing material via normal pressure sintering. The porous fluorapatite ceramic adsorbing material prepared herein has the advantages of high radiation stability, good thermal stability, high mechanical and chemical stability and the like, also has high specific surface energy and nuclide adsorbing capacity and may be used as an efficient adsorbing material for radioactive nuclide in high-radioactive waste liquid, thus effectively protecting human health and ecological environment.

The invention relates to a detection method for the sub-surface damage layer thickness of silicate glass, and the method comprises the steps: cutting a silicate glass sample to form a slope, and carrying out the cleaning and supersonic processing, wherein an inclination angle alpha is an inclined angle between the slope and a plane; polishing the slope, and carrying out the cleaning and supersonicprocessing; carrying out the acid-alkali-acid processing of the polished slope, and carrying out the cleaning, supersonic dehydration and drying; carrying out the high-temperature reduction of the dried sample, carrying out the cooling operation, and measuring the length L of a damage region on the slope, wherein the length L takes an intersection line of the plane with the slope as a start point, and takes an intersection line of a crack region with a region without a crack on the slope as the end point; and calculating the damage layer thickness D=L*sin(alpha). The method is suitable for the detection of the sub-surface damage layer thickness of silicate glass, is high in detection precision, and can achieve the engineering application.

The invention provides a columnar layer double-mode structure thermal barrier coating and a preparation method thereof, wherein the thermal barrier coating is formed by stacking flat particle layers formed by material powder to form a layered structure, has vertical pores, and is divided into a plurality of blocks by the vertical pores to form a columnar structure. During the preparation, thermalbarrier coating powder is subjected to spray deposition through a thermal spray coating method to prepare a layered thermal barrier coating formed by stacking flat particles, and a plurality of vertical pores are formed in the layered thermal barrier coating through a stress excitation and pore induction pretreatment process to obtain the columnar layer double-mode structure thermal barrier coating. According to the present invention, with the columnar layer double-mode structure thermal barrier coating, the service life of the coating is significantly prolonged while the vertical thermal insulation performance of the coating is maintained so as to integrate the high thermal insulation and long service life of the coating.

The invention relates to a constant temperature control device, in particular to a temperature control device for an electrolyte storage device of a vanadium redox battery. The electrolyte storage device is controlled at constant temperature by using a cyclic temperature control method, the optimum working temperature of the whole system is effectively ensured, radiating area is large, the occupation area of an energy storage system is saved by using an internal space of a liquid storage tank, and the system can operate safely, stably and reliably. The temperature control device is novel in design and reasonable in structure, the working temperature of a control system can be controlled in real time, the constancy of temperature is maintained, and the system can operate safely and reliably. The temperature control device can be conveniently integrated in the energy storage system of the vanadium redox battery, large-scale engineering application of the energy storage system is realized, and the stability of the system is effectively improved.

The invention discloses a deformation monitoring method of an elastic supporting plate based on strain monitoring. By adoption of the method, the deformation monitoring theory of beams is extended tothe deformation monitoring of two-dimensional plates, and the monitoring theory of bending deformation of the plate is deduced. The method comprises the following steps: obtaining strain data of theplate by using a strain sensor, approximately assuming a strain function of the plate under an edge elastic supporting boundary condition, substituting strain measurement results of different positions into the strain function to obtain parameters of the strain function, and obtaining a displacement function through a strain-displacement transformation relationship to figure out a bending deformation value of the plate; and calculating the bending deformation of the plate at each moment by calculating the strain at each moment, so that the dynamic monitoring of the bending deformation of the plate can be realized. By adoption of the deformation monitoring method disclosed by the invention, the bending deformation of the plate can be monitored at lower cost by simple equipment on the premise of ensuring the precision, thereby having important theoretical significance and engineering application value for the structure health monitoring, structure safety evaluation, etc.

The invention discloses foam light soil with granite ballast powder as a main material and a preparation method of the foam light soil. The foam light soil is prepared from, by mass, 45-60 parts of the granite ballast powder, 11-20 parts of pozzolana cement, 7-15 parts of slag, 0.8-1.9 parts of a water reducing agent and 14-25 parts of foam. Cement is replaced by the granite ballast powder to serve as the main material for foam light soil production, and the foam light soil prepared by taking the granite ballast powder as the main material is superior to existing foam light soil mainly prepared from cement in the mechanical property of uniaxial compressive strength, so that production cost is reduced, product performances are improved, and a high market value is achieved. Further, by adoption of the granite ballast powder in specific particle size, compressive strength of the foam light soil is greatly improved, and the uniaxial compressive strength is improved by 50% or above.

The invention belongs to the field of industrial wastewater treatment, and particularly relates to a method for treating heavy metal complex wastewater based on a UV / chlorine advanced oxidation technology. The following technical schemes adopted by the invention are that the method for treating the heavy metal complex wastewater based on the UV / chlorine advanced oxidation technology is characterized by comprising the following steps: (1) dropping a chlorine oxidizing agent in to the heavy metal complex wastewater, then regulating pH of water quality by using hydrochloric acid or sodium hydroxide solutions and stirring, and lighting and treating a damaged complex structure, wherein the dropping is carried out according to a molar equivalence ratio that active chlorine produced by the chlorine oxidizing agent to complex-state heavy metal in water is (5-150) to 1; (2) regulating a pH value to enable the heavy metal to form precipitants, and then carrying out solid-liquid separation to complete wastewater treatment. By adopting the scheme, a novel method for treating the heavy metal complex wastewater based on the UV / chlorine advanced oxidation technology which can realize economic and high-efficient treatment on wastewater in a variety of industries such as electroplating, tanning, printing circuit board and the like.

The invention discloses a dynamic force sensor sensitivity calibration method and device. The method comprises steps that silicone grease is filled between a calibration force sensor and a standard acceleration sensor fixing surface; M mass blocks are respectively arranged on a standard acceleration sensor for measurement, and the M is not smaller than 2, a vibrator is driven to generate vibration, output voltage signals of a standard acceleration gauge and a to-be-calibrated force sensor and acceleration detected by the standard acceleration gauge are acquired, and sensitivity of the to-be-calibrated force sensor is calculated according to the acquired signals. According to the method and the device, a fixing method of the to-be-calibrated force sensor and the standard acceleration sensor is realized, a specific dynamic calibration precision expression of the force sensor is acquired through derivation, no-suspension mounting requirement is proposed for the standard mass blocks, operation difficulty is reduced, and measurement precision and reliability are easily guaranteed.

The invention belongs to the field of a drill-rivet method, specifically relates to a drill-rivet method for a semi-closed cage type thin-wall inter-box housing section, and aims at realizing the engineering application of the automatic drill-rivet technology on the inter-box section of a carrier rocket. The automatic drill-rivet technology is a novel technology developed for overcoming the shortage of manual drill rivet, and has the advantages of being high in production efficiency, high in quality reliability and small in production noise. The automatic drill-rivet technology enables automatic drilling, pin feeding, rivet performing, gumming, planing and other functions, and can be widely applied to a wing wallboard and body wallboard and the like with high openness in spacecraft instrumentation. With the adoption of the drill-rivet method, the drill-rivet efficiency is increased, the form and location tolerance of the product meets the design index requirement, the rivet noise is reduced, and the first pass yield of a rivet is increased.

The invention aims at provides a preparation method of an NiCrAlYSi powder spraying material. The method adopts a technology of 'mother alloy pre-preparation and ultrasonic gas atomization' and a purpose of uniform control for chemical components of powder is achieved. The method comprises the specific steps that (1), a mother alloy is pre-prepared by a vacuum induction heating method; raw materials are placed into a magnesia crucible, with forvacuum degree higher than 2Pa, refining temperature of 1390-1430 DEG C, refining period of 15-20min, and casting temperature of 1420-1460 DEG C; the raw materials are cooled and cast to an alloy bar with a diameter of 70-100mm; (2) component analysis is conducted on the obtained mother alloy; if components of the obtained alloy exceed a proportion of the chemical components of the NiCrAlYSi powder, secondary stock preparation is conducted according to the proportion; (3), gas atomization pulverization is conducted, with atomization temperature of 1500-1530 DEG C, atomization pressure of 8-10MPa, gas flow of 10-15m<3> / min, alloy liquid flow of 2-4kg / min, and an atomization medium of pure argon.

The invention discloses a 304L austenitic stainless steel MIG welding method. The welding method comprises the following steps of preparing grooves in 304L base materials, removing moisture on the twosides of the grooves, conducting assembly on the 304L base materials to be welded, and conducting tack-welding through tungsten electrode argon arc welding; conducting bottoming welding through double-sided tungsten electrode argon arc welding, wherein welding wires adopt ER316L; conducting welding on a filling layer and a surfacing layer through MIG welding; and conducting heat treatment on welded 304L austenitic stainless steel welded joints at the heat treatment temperature of 550-590 DEG C for 1-2 h of temperature holding. Through the 304L austenitic stainless steel MIG welding method provided by the invention, the low-temperature toughness of the 304L austenitic stainless steel MIG welded joints can be improved.

The invention discloses a micro-nanometer composite laminated gradient structure thermal barrier coating and a preparation method of the micro-nanometer composite laminated gradient structure thermalbarrier coating. The coating is formed by stacking a plurality of sub-layers with the quantity of N. The ratio of the thickness of each sub-layer to the heat conductivity of the same sub-layer is equal. The thermal conductivity of the sub-layers gradually decreases from the first sub-layer close to a bonding layer to the sub-layer with the serial number of N. Each sub-layer is formed by alternately layering and depositing first thermal barrier coating material powder and second thermal barrier coating material powder. A sheet layer unit with the density greater than 90% is formed by the firstthermal barrier coating material powder, and a sheet layer unit with the density less than 60% is formed by the second thermal barrier coating material powder. The volume of a second thermal barrier coating material accounts for 10%-50% of the total volume of the thermal barrier coating. The micro-nanometer composite laminated gradient structure thermal barrier coating achieves the purpose of resisting sintering of a ceramic coating in a high-temperature environment. Due to the gradient design, reverse restrictions imposed by the thickness of a single structure coating on the heat insulation capability and the service life are lifted, and the sintering resistance and long service life collaborative design of a novel structure is ensured.

The invention discloses a broadband high-reliability piezoelectric beam coupled energy collection device, which is formed by a plurality of piezoelectric beams arranged in the housing. The opposite ends of the piezoelectric beams are connected through a mass block made of a ferromagnetic material and a limit bolt to control large deformation under over-impact load. The housing is internally provided with a permanent magnet, which produces a magnetic field at the place of the mass block to form a piezoelectric magneto-elastic structure. Under the external vibration loading condition, the vibration energy is transferred to the housing, which makes the piezoelectric beams generate nonlinear vibration perpendicular to the piezoelectric beams, so that wideband energy collection is realized. Thetail ends of the piezoelectric beams are connected to an energy collection module, and the energy collection module collects electric charges generated by vibration of the piezoelectric beams. The device has the characteristics of large strain, wide response frequency and high charge output of the piezoelectric beams, as well as reliability of the structure in the vibration energy collection process, thereby not only ensuring efficient vibration energy collection, but also ensuring long-term reliable and stable working condition of the structure.

The invention discloses a differential protection method for a multi-winding arbitrary phase shift angle phase shift transformer. The method comprises steps that currents of windings at a primary side and a secondary side of a transformer are acquired in real time; reduction from a secondary side multi-winding arbitrary angle current of the transformer to a primary side current is carried out through a phase shift synthesis algorithm; current differential amount and braking amount are calculated according to the current after reduction and the primary side current; in combination with the current differential amount and the braking amount, whether action conditions are satisfied is determined, if yes, a differential protection logic locking mark is invalid, differential protection is valid, and the protected transformer is cut off through tripping. The method is advantaged in that the method is suitable for differential protection on the multi-winding arbitrary phase shift angle phase shift transformer, the method is compatible with differential protection of common transformers, strong universality is realized, and the phase shift synthesis algorithm provides a new solution thinking for reduction from the secondary side multi-winding arbitrary angle current of the transformer to the primary side current.

The invention belongs to the field of scintillation crystal materials, especially relating to a codoping modified lithium gadolinium borate scintillation crystal and a preparation method thereof. The codoping modified lithium gadolinium borate scintillation crystal has the following chemical formula: Li6CexNyGd1-x-yB3O9-delta / 2Mdelta, wherein, M is selected from one or two elements of F, Cl, Br and I, N is selected from one or two elements of Sc, Y, La and Lu, and at least one of Li element, Gd element and B element exists in the form of special isotope; x is more than 0 and is 0.2 at most, y is 0 at least and is smaller than 1, delta is 0 at least and 0.1 at most, and y and delta can not be 0 at the same time. The preparation method comprises the following steps: raw materials are mixed, synthesized in solid phase and transformed to grow and prepare single crystal form with a pulling method in a single crystal growing furnace. The codoping modified lithium gadolinium borate scintillation crystal of the invention takes Ce ion as an luminous center, and lithium, gadolinium and borate elements exist in one or the combination of Li-6, gadolinium-155, gadolinium-157 or borate-10 isotope so as to perform the function of generating nuclear reaction with the detected neutrons.