3082 results about "Bushing" patented technology

The invention discloses a sleeve fault diagnosis method and system. The method comprises the following steps: preprocessing an acquired sleeve infrared image to filter out a non-heating part; segmenting the image of which the non-heating part is filtered out to obtain a single sleeve image; diagnosing the sleeve fault according to the segmented single sleeve image. According to the invention, theinfrared image of the transformer sleeve is preprocessed and segmented, therefore, an infrared image of a single sleeve is obtained; the temperature of each part of the sleeve can be conveniently obtained by converting the gray scale of each pixel in the gray scale map of the infrared image of the single sleeve into the corresponding temperature value, the method is simple but very ingenious, thefaulted sleeve and the faulted area can be quickly positioned, the specific fault type can be judged, and convenience and quickness are achieved.

The invention relates to the technical field of high-voltage electrical equipment, and particularly discloses a high-insulating-property thermoplastic sleeve and a method for preparing the same based on a co-extrusion process, the surface of a nonlinear layer is wrapped with an insulating material, so that the corona discharge phenomenon is avoided; and meanwhile, the same thermoplastic material is adopted as the insulating layer (including the first thermoplastic layer and the second thermoplastic layer) material and the base material of the nonlinear layer, so that no obvious interface exists between the insulating layer and the nonlinear layer, charge accumulation is avoided, insulation failure is avoided, the insulation and voltage resistance of the sleeve is improved, and the operation reliability is improved.

The utility model provides a spring-free type bushing end screen, which belongs to the technical field of bushing end screens and comprises a flange seat, an insulating sealing sleeve is embedded in an inner cavity of the flange seat and is clamped in the inner cavity of the flange seat through a locking component, and a locking thread is arranged at the end part, far away from the flange seat, of a binding post along the outer wall. The inner wall of the side, away from the flange hole, of the flange base is in threaded connection with a grounding piece, the grounding piece is arranged outside the locking thread in a sleeving mode, anti-skid lines are arranged on the outer wall of the grounding piece in the circumferential direction, external threads are formed in the bottom of the outer wall of the grounding piece in the circumferential direction, internal threads are formed in the top of the inner wall of the flange base, and therefore the grounding piece is in threaded connection with the top of an inner cavity of the flange base. After the grounding piece is in threaded connection with the flange seat, the end screen is in a continuous grounding state, stable operation of the transformer is guaranteed under the condition that overall stability is guaranteed, and the protection effect is enhanced.

The invention relates to a safety system for automatic pressure relief during an internal arc fault period of an alternating-current transformer bushing, and the system comprises the alternating-current transformer bushing which is used for accommodating an insulating medium; the first pressure relief structure is arranged between the alternating-current transformer bushing and the vacuum container and is used for communicating the alternating-current transformer bushing with the vacuum container under the condition that the internal pressure of the alternating-current transformer bushing exceeds a preset pressure threshold value; the optical signal detection device is arranged in the alternating-current transformer bushing, is in communication connection with the control device, and is used for detecting an optical signal, converting the optical signal into an electric signal and outputting the electric signal to the control device; the control device is in communication connection with the second pressure relief structure and is used for outputting a starting instruction to the second pressure relief structure under the condition that it is determined that the arc fault occurs according to the electric signal; and the second pressure relief structure is arranged on the middle flange and is used for communicating the alternating-current transformer bushing and the external space in response to the opening instruction. By adopting the system, early fault intervention and controllable pressure release can be realized.

The application discloses a composite material structure bushing reinforcing method based on electromagnetic loading, which uses electromagnetic loading to complete the bushing reinforcement of the composite material structure, and obvious beneficial effects are obtained compared with traditional methods. The method proposes a process parameter calculation method for the reinforcement process of the structure to solve the problem that existing devices and methods cannot be applied to the bushing reinforcement of the composite material structure. The radial compressive stress around the hole is obtained through the Lame formula and the elastic stress-strain relationship of the composite material, and then the total resistance of dynamic extrusion friction in the reinforcement process is obtained through the Coulomb friction theory, and the process parameters are determined in combination with the mathematical model of the electromagnetic force. The application can realize the calculation of the reinforcement process parameters of the composite material bushing with different structures and sizes, and is used for guiding the reinforcement of the dynamic cold extrusion composite material bushing structure.

The invention relates to the technical field of power equipment on-line monitoring and fault diagnosis, and discloses a converter transformer bushing end screen voltage abnormity detection device and early warning method.The method comprises the steps that voltage data are collected through a wireless intelligent sensor, soft synchronization and self-adaptive windowing are achieved through a commutation notch feature locking mechanism, and a preprocessing signal is output; topological correlation clustering is executed to construct a virtual health reference, a dynamic residual sequence is extracted through time domain difference, and system side and equipment side features are decoupled; constructing a variational mode decomposition model, and calculating a characteristic entropy value of the intrinsic mode function; and comparing the entropy value with a threshold value, triggering an active impedance disturbance verification mechanism, controlling a sensor to access a load and comparing an actual voltage drop rate with a theoretical voltage drop rate, and determining an insulation degradation or poor contact fault. High-precision synchronization can be achieved without a hardware clock, and the problems that weak fault features are difficult to extract and virtual connection and insulation faults are difficult to distinguish in a high-impedance loop are effectively solved.

The invention relates to the field of precision machining detection, and discloses a hydraulic shaft sleeve machining detection system and detection device which comprises a pneumatic servo control module, a signal collecting and processing module and a thermal inversion calculation module. The pneumatic servo control module drives the overturning air cylinder to apply a composite pressure waveform containing a static reference and a periodic flutter component to the hydraulic sleeve; the signal acquisition and processing module performs frequency domain analysis on a displacement signal detected by the displacement sensor and separates average displacement and displacement amplitude; the thermal inversion calculation module calculates real-time dynamic stiffness according to the displacement amplitude, a material stiffness thermal softening model is used for reversely deducing a temperature rise value, thermal expansion and elastic deformation errors are stripped through multi-dimensional error decoupling operation, and real height data under the standard temperature and without external force are calculated. According to the invention, active excitation and frequency domain analysis technologies are utilized, so that the interference of an oil film and thermal deformation is effectively solved, and high-precision online detection and processing compensation of a thermal-state workpiece are realized.

The invention relates to the technical field of transformer arc fault detection, in particular to an optical fiber sensing detection method, system and device for an arc fault in a transformer bushing and a storage medium. Acquiring internal pressure and flow velocity data of the casing by constructing an optical fiber sensing detection model, identifying fault feature points and determining a pressure-flow velocity relationship; establishing a pressure change prediction model in combination with the environmental parameters to perform first prediction, and analyzing pressure and flow velocity dynamic characteristics to obtain a dual-drive fault threshold to perform second prediction; and an arc fault diagnosis model is constructed based on the double-parameter coupling matrix, and a time-varying early warning model is established in combination with fault evolution to realize fault prediction. According to the invention, the technical problem that the traditional detection method cannot monitor the arc fault in the bushing in real time is solved, the accurate identification of fault features, the early warning of precursor signals and the accurate prediction of residual life are realized, the detection precision and real-time performance are obviously improved, and reliable guarantee is provided for the safe operation of the transformer.

The invention discloses a modularly installed electric energy metering box, and relates to the technical field of electric energy metering boxes, the top and bottom of a main gas box are connected with a plurality of assembly gas heads, one side of the main gas box is provided with a plurality of assembly boxes, one side of each assembly box is uniformly provided with a plurality of heat dissipation holes, and two sides of the top and two sides of the bottom of each assembly box are connected with communicating sleeves; the middle of the communication sleeve is connected with a supporting pipe, one end of the supporting pipe is sleeved with an assembling nut, the assembling nut is connected with the adjacent assembling air head, and the other end of the supporting pipe is connected with an external air head. The external air head in the assembling heat dissipation assembly can be connected with the assembling nut, and double-layer installation of electrical devices can be achieved in the metering box; the assembling nut in the flexible expansion assembly can also be connected with the expansion air head, flexible installation of a small number of electrical devices is achieved, the two assemblies are installed in a modularized mode, the heat dissipation effect is guaranteed, and meanwhile the space utilization rate of the whole metering box is improved.

The utility model discloses a novel bearing for a fan blade main shaft of a wind power generator, which relates to the technical field of generator bearing equipment, and comprises a bearing seat, a bearing seat base, a bearing cover, a sectional bearing bush, an upper bushing and a lower bushing, the top end of the bearing seat is provided with a circular-truncated-cone-shaped mounting groove, and the bottom end of the bearing cover is a circular-truncated-cone-shaped surface matched with the circular-truncated-cone-shaped mounting groove. A first gap is reserved between the outer wall of the upper bushing and the top wall of the circular-truncated-cone-shaped mounting groove and a first gap is reserved between the outer wall of the lower bushing and the bottom wall of the bearing cover, and a plurality of sectional bearing bushes are movably arranged in the first gaps at equal angles. Compared with the prior art, the service life of the bearing is prolonged, stable and long-acting operation of the wind driven generator is effectively guaranteed, smaller bearing bush segments are adopted, the difficulty in manufacturing, mounting and transporting the bearing bush is reduced, and only a small number of bearing bush segments which break down need to be replaced during maintenance.

The invention discloses a through needle temperature and pressure sensor and an assembly process, and relates to the technical field of temperature and pressure sensors, and the sensor comprises a ceramic pressure core body and an NTC assembly. An NTC (Negative Temperature Coefficient) through needle for outputting a temperature signal is arranged on the ceramic pressure core body in a penetrating manner; the NTC assembly comprises an NTC chip, a lead wire sleeve, a fixing seat and a metal sheath, a lead wire of the NTC chip is sleeved in the lead wire sleeve and extends out to be arranged through the fixing seat, and the metal sheath is sleeved outside the lead wire sleeve and the NTC chip and is fixed on the fixing seat; the lead of the NTC chip is connected with the NTC through pin through electric resistance welding, so that the connection reliability is improved, and meanwhile, the soldering tin rosin is prevented from sputtering to pollute the fixed seat and the ceramic pressure core body; the structure of the temperature pressure sensor is simplified, the reliability of electric connection is improved, and a signal path is rationalized through lead wire arrangement, metal sheath protection and electric resistance welding direct connection; the problems of complex structure, circuit virtual connection and low reliability of the existing temperature and pressure sensor are effectively solved.

The invention relates to the field of power system equipment detection, in particular to a residual magnetism measuring device and method for a large power transformer. The residual magnetism measuring device for the large-scale power transformer comprises the large-scale power transformer, a high-voltage bushing, a high-voltage neutral point bushing, a low-voltage bushing, an iron core outgoing line bushing, a first capacitor, a second capacitor, a detection impedor, a partial discharge instrument and a large-current generator, the capacitance of the first capacitor is 30pf-40pf and is matched with the capacitance of a transformer iron core, and the capacitance of the second capacitor is 300pf-400pf and is 10 times proportional to the capacitance of the first capacitor; the method comprises the following steps: carrying out a long-time induction withstand voltage and partial discharge test after a conventional test, measuring discharge amounts Q1, Q2 and Q3 at 0.5, 1 and 1.5 times of rated voltages, judging residual magnetism according to the difference value of the discharge amounts and an iron core grounding current, and if the residual magnetism exceeds the standard, magnetizing and demagnetizing by using a large current generator at the frequency of 150Hz. The method has the advantages that the residual magnetism is measured and evaluated in time, equipment faults are avoided, operation is easy and convenient, and adaptability is high.

This utility model discloses an automatic circuit board testing device, including a base and a support. The support has a crossbeam and a vertical support. The crossbeam is equipped with a vertical moving mechanism that drives a detection positioning plate to move up and down. The vertical support has a guide mechanism that slides with the detection positioning plate. The detection positioning plate has several circular holes for placing detection probes or detection seats. The circular holes are arranged in a matrix and have annular grooves inside. The annular bosses on the detection probes or detection seats are interference-fitted with the annular grooves for fixation. The vertical moving mechanism can adopt a wrench drive or a bushing structure. The guide mechanism includes a guide post that fits with a through hole or a groove that fits with a boss. The device also includes a transition plate and a transition hole on the base. This device achieves automated testing through mechanical structure design, improving efficiency and accuracy, and has the advantages of strong versatility and convenient maintenance.

The invention discloses a die-casting die thermal fatigue life detection device, and relates to the technical field of die-casting die detection, the die-casting die thermal fatigue life detection device comprises a detection machine body and a control platform, and the top of the detection machine body is provided with a material thermal fatigue detection assembly and a mechanical load mechanism. When the device is used, the electric push rod pushes the heat insulation sleeve to penetrate through the penetrating hole and continue to move, and the movable turning cover is jacked upwards. Under the combination of the vacuum cavity, the honeycomb-shaped porous heat insulation plate and the metal foil reflecting screen, the heat insulation sleeve forms a triple barrier of reflection, vacuum and porous heat insulation, heat transfer is blocked, and it is guaranteed that cold air is not affected by heat of an air cooling opening when blown. When the material thermal fatigue detection assembly works, the cold air pipe and the heat insulation sleeve are located outside the detection box, the heat absorption temperature of the cold air pipe is prevented from increasing in the heating process, and the mold thermal fatigue detection precision and efficiency can be improved.

A shielded electrical connector is provided, comprising a plurality of wire elements, a plurality of wire element sheaths, an outer shielding sleeve, at least one inner shielding sleeve, a connector housing for accommodating terminal members, a shield divider for defining at least two shielding sectors, wherein the first subset of wire elements is extended into a first shielding sector and a second subset of wire elements is extended into a second shielding sector, at least one sealing insert for being arranged in one of the shielding sectors for sealing off a cable side from a connector side in the area of the shield divider, and an electrically conductive shielding bridge for electrically connecting the outer shielding sleeve to the at least one inner shielding sleeve and to the shield divider.

The invention relates to the technical field of partial discharge detection and sensor verification, and particularly discloses an ultrahigh frequency sensor relative amplitude online verification method for transformer bushing defects. The method comprises the following steps: firstly, spraying conductive paint into a lower porcelain bushing of the transformer bushing to form a creeping discharge channel, and constructing a transformer bushing operation simulation device; then, a standard calibration pulse generator is utilized to inject a discharge signal equivalent to a 10pC electric charge quantity at the defect position of the sleeve; then, the ultrahigh frequency sensor to be tested receives a partial discharge signal, and a relative amplitude model is established based on sensor frequency response, dielectric constant, signal propagation attenuation and installation conditions; and finally, comparing the actually measured signal amplitude with the calculated relative amplitude threshold, and if the amplitude is lower than the threshold, judging that the performance of the sensor is degraded. According to the method, the installation condition correction model is introduced, online evaluation of the sensitivity of the ultrahigh-frequency sensor under the condition that equipment is not disassembled is achieved, the real performance of the sensor in a complex field environment can be accurately reflected, and the reliability and maintenance efficiency of a transformer bushing partial discharge monitoring system are remarkably improved.

The invention provides a laser wire and powder collaborative additive manufacturing paraxial wire feeding equipment fixing device which comprises a fixing mechanism, a rotating mechanism, a wire twisting mechanism and a shielding gas mechanism, the fixing mechanism comprises a laser head and a clamping plate, a powder spray head is arranged at the laser head, and a molten pool for laser fusion of metal wires is arranged below the laser head and the powder spray head; the rotating mechanism comprises a connecting block and a rotating shaft, the connecting block is fixedly connected to one side of the clamping plate, the rotating shaft is rotationally connected with the connecting block, and a rotating shaft sleeve is arranged on the rotating shaft; the wire twisting mechanism comprises a wire feeding pipe, a wire twisting pipe and a wire guiding pipe which are communicated in sequence, the wire twisting pipe is fixedly connected with the rotating shaft sleeve, and a wire twisting cavity is formed in the wire twisting pipe; the protective gas mechanism comprises a cavity block and a connecting pipe, the cavity block is connected with the clamping plate, and the connecting pipe is used for connecting a protective gas bottle. Compared with the prior art, according to the scheme, the contact angle of the powder spray head of metal powder and the metal wire and the melting angle of laser and the metal wire can be adjusted, and then the forming quality of a metal component is guaranteed.

Support structures and methods for securing at least one element, such as a wire or bundle of wires, in an opening of a panel or other structure. A support assembly may comprise a grommet having an opening to accommodate the at least one element and a bushing configured to clamp around an outer surface of the grommet. The bushing may comprise one or more petals configured to contact a first surface of the structure and one or more snaps configured to contact a second surface of the structure that is opposite to the first surface.

The invention relates to the technical field of electric power, in particular to a multi-field coupling optimization design method applied to a high-voltage wall bushing. According to the technical scheme, the method comprises the following steps: (1) constructing a three-dimensional geometric model of the high-voltage bushing, and solving an electric-thermal bidirectional coupling field based on a finite element method; selecting a to-be-optimized variable, and constructing a dual-objective function of an electric field distortion coefficient and a hot spot temperature through nonlinear regression; (2) carrying out multi-target optimization by adopting an improved multi-target particle swarm algorithm coupled with the soup discharge discrimination, and synchronously executing discharge risk screening in an iteration process; and (3) generating an optimization design scheme based on the Pareto leading edge solution set, and verifying that the design is effective through a field distribution test. Therefore, the establishment of the optimization problem is more accurate, the optimization efficiency is higher, and the phenomena of partial discharge and the like of the bushing caused by a local high-field-intensity region generated in the design can be avoided.

A casing patch assembly that is deployable within a casing has a pipe with a wide diameter portion and a narrow diameter portion, an expansion cone positioned within the pipe, a plug sealingly engaged against the wide diameter portion of the pipe so as to form a seal, and an anchor having a portion engaged with the inner wall of the wide diameter portion of the pipe. The plug has a first shaft extending through a borehole in the expansion cone and a second shaft adapted to pass a fluid through a channel in the plug so as to urge the expansion cone along the narrow diameter portion of the pipe so as to expand the narrow diameter portion of the pipe.

The invention relates to a composite vapor chamber with vertical gradient capillary channels as well as a preparation method and application of the composite vapor chamber. The composite vapor chamber comprises an upper shell, a lower shell, a liquid absorption core and a heat transfer working medium, the upper shell and the lower shell are both composite boards formed by combining outer side base layers and inner side copper layers, the lower shell is provided with supporting columns protruding towards the inner side, and the supporting columns are located in the cavity and connected with the upper shell; the wick comprises a first wick, a second wick and a third wick, and the first wick is located at one end of the upper shell and combined with the copper layer of the upper shell; the second wick is positioned at one end of the lower shell and is combined with the copper layer of the lower shell; the third wick is an annular sleeve and sleeves the periphery of the supporting column, one end of the third wick is connected with the first wick, the other end of the third wick is connected with the second wick, and a heat transfer working medium backflow channel penetrating through the upper shell and the lower shell is formed; the heat transfer working medium is located in the cavity.

Impact wrench (1) having an overall shape of a ‘T’ and comprising an upper handle group (2), a lower working group (3) and an intermediate connecting rod (4) connected between the handle group (2) and the working group (3), wherein: - the handle group (2) comprises a first body (2') with two elongated handles (5, 6) extending in opposite directions to each other and transversely to a longitudinal direction (14) of the screwdriver (1), a manual actuating element (7) and a battery seat (8) for receiving an electric battery (9), - the working group (3) comprises a second body (3'), a tool holder shaft (10) rotatably mounted about a pivot axis (R) and capable of carrying a screw bushing, an electric motor (11) powered by the battery (9) and operable by the manual actuating element (7), a gearbox (12) and an impact mechanism (13) connected between the motor (11) and the tool holder shaft (10) to impart rotational and impact impulses, where: - the battery seat (8) consists of a cavity (34) formed in an outer surface of the first body (2') on an operator side (33) of the impact wrench (1), wherein the cavity (34) is open to the outside of the first body (2') on the operator side (33) and on a top surface (35) of the impact wrench (1) opposite the working group (3), - the cavity (34) accommodates the battery (9) over at least half of its thickness (37), measured in the direction of the operator side (33), and / or the battery (9) extends beyond the free ends of the handles (5, 6) in the direction of the operator side (33) by less than one third or less than one quarter of the thickness of the battery (37), measured in the direction of the operator side (33).

A method for hot-press injection molding of a composite material control arm is disclosed. The resulting control arm structure includes a composite sheet with pin holes and needle holes, a rubber body, a ball pin, and a bushing. The mold used for hot-press injection molding has a rear mold with positioning pins, positioning holes, and a positioning cylinder. During molding, the composite sheet is hung on the positioning pins through its pin holes, the bushing is fitted onto the positioning cylinder, and the ball pin is inserted into the positioning hole through its pin shaft. Then, the front mold presses the composite sheet, bending its edges to form a concave shape. Finally, plastic is injected to form the rubber body, combining the composite sheet, ball pin, and bushing into a whole. The bushing has ribs extending circumferentially on its outer side. During injection molding, the two ends of the composite sheet rest on the outer side of a bushing's rib. By setting the ribs, the distance between the composite sheet and the outer circumference of the bushing is maintained, allowing the rubber to flow between the composite sheet and the bushing. This enables the pre-forming and injection molding of the skeleton to be completed on a single mold, resulting in stable product quality.

The invention discloses anti-corrosion treatment equipment for a high-conductivity wire, and relates to the field of wire production equipment, the anti-corrosion treatment equipment comprises a wire harness rack and a wire harness barrel body, a steel core sleeve is arranged on the wire harness rack, a wire twisting disc is arranged on the wire harness rack, a base is arranged at one end of the wire harness rack, an adjusting body is arranged on the base, the adjusting body is provided with a greasing frame body, and a storage body is arranged on the greasing frame body; a heating part is arranged in the storage body, a grease filling assembly is arranged on one side of the base, one end of the grease filling assembly is communicated with the storage body, a grease coating part is connected to the storage body and comprises a plurality of inclined pipes, and pressurizing parts are arranged outside the inclined pipes; according to the anti-corrosion treatment equipment for the wire, grease enters gaps of an aluminum stranded wire, the aluminum wire and a steel core under the action of the pressurizing part through the inclined pipe and the grease spray head, the grease is rapidly dried through the arc-shaped drying lamp, it is ensured that grease anti-corrosion treatment is conducted on the gaps in the wire, and the heating part is synchronously heated while redundant grease on the surface of the wire is scraped; grease can be heated and kept warm, and the anti-corrosion effect of the wire is improved.

The invention relates to the technical field of electrical equipment, in particular to a moisture-proof impregnated paper composite insulating sleeve and a preparation method and application thereof. The moisture-proof impregnated paper composite insulating sleeve provided by the invention comprises an impregnated paper capacitor core body and a moisture-proof enhancement layer on the outer surface, the moisture-proof reinforcing material comprises at least one of glass fiber, polyester and polyolefin, and the polyester comprises polyethylene glycol terephthalate; the impregnated paper capacitor core body comprises a central conductive tube, impregnated paper and a capacitor plate; the impregnated paper and the capacitor plates are alternately coated on the outer surface of the central conductive tube from inside to outside, and the impregnated paper or the capacitor plates are arranged on the outermost layer of the impregnated paper capacitor core body. According to the invention, the moisture-proof reinforcing layer is arranged on the outer surface of the impregnated paper capacitor core body, so that moisture in air during storage and trace moisture in transformer oil during operation can be effectively prevented from invading the impregnated paper capacitor core body, the capacitor core body is prevented from being affected with damp, the electrical property is reduced, the mechanical bending strength is enhanced, and the service life of the capacitor sleeve is prolonged.

An adjustable roller assembly for a linear rail system carriage has an indexing collar, an eccentric bushing, an adjustable roller, a suspension element, and an adjustment collar. The indexing collar has a first indexing structure. The adjustable roller is rollably mounted to a roller side end of the eccentric bushing. A rolling axis of the adjustable roller is offset from the axis of the adjustable roller assembly. The suspension element is mounted in axial alignment with an adjustment side end of the eccentric bushing. The adjustment collar has a circumferential flange having a second indexing structure. The first indexing structure and the second indexing structure are coupled to rotationally couple the adjustment collar with the suspension element.

The application discloses a novel lung lobe-shaped magnetic shielding partial discharge detection device and a detection method. The device comprises an isolation transformer, a bushing, a detection electrode and a partial discharge instrument. A single-phase power supply is connected with a reactor in parallel, and then connected with an input end of the isolation transformer. One end of an output end of the isolation transformer is connected with the bushing, and then connected with the detection electrode. The other end of the output end of the isolation transformer is grounded. A grounding end of a to-be-detected lung lobe-shaped magnetic shielding is grounded, and the grounding end of the to-be-detected lung lobe-shaped magnetic shielding is connected with the partial discharge instrument. The to-be-detected lung lobe-shaped magnetic shielding and the detection electrode are correspondingly arranged to form an equivalent capacitor and are coupled and connected. The application can be used to determine whether there is a defect in the lung lobe-shaped magnetic shielding by performing a partial discharge test on the lung lobe-shaped magnetic shielding before the lung lobe-shaped magnetic shielding is assembled into a transformer. The application has the characteristics of high test efficiency and low applied voltage, and greatly improves the first-time pass rate of the transformer product provided with the lung lobe-shaped magnetic shielding.

This invention discloses a method for determining the unloaded bus current and a busbar switching control method using the same method. The method for determining the unloaded bus current includes the following steps: A1. Installing current sensors on the porcelain bushings of the circuit breakers on the unloaded busbar side of each phase; A2. Connecting each current sensor to a multi-channel waveform recorder to obtain the maximum capacitive current of each phase unloaded busbar through the multi-channel waveform recorder; A3. Obtaining the maximum capacitive current value of the unloaded busbar. The busbar switching control method includes selecting the threshold value for operating the unloaded busbar with the disconnecting switch according to the rated voltage level of the busbar; and selecting the disconnecting switch or the circuit breaker on the unloaded busbar side to control the switching operation of the corresponding unloaded busbar according to the maximum capacitive current and the threshold value. This invention can flexibly adjust the threshold values ​​for operating the unloaded busbar with the current sensors and disconnecting switches according to the rated voltage level of the busbar, which has good engineering adaptability, is more in line with the actual situation on the engineering site, has good performance, and is easy to promote and use.

This invention provides a load switch assembly, comprising: a load switch; an insulating sleeve mounted on the load switch, the insulating sleeve having a conductive rod inside for electrical connection with the load switch; and a power-taking insulating assembly assembled at the end of the insulating sleeve, the power-taking insulating assembly including an insulating sleeve, a voltage-taking block, a conductive contact, and a power-taking lead; wherein the insulating sleeve covers the end of the insulating sleeve and has a cavity covering the voltage-taking block; the voltage-taking block and the cavity have lead grooves for accommodating the power-taking lead to extend outwards; the voltage-taking block and the insulating sleeve respectively have first and second through holes for accommodating the conductive contact, the conductive contact abutting against the end face of the voltage-taking block and passing through the first and second through holes to connect with the conductive rod. This invention, by placing the voltage-taking block within the cavity of the insulating sleeve and using the lead grooves to extend the power-taking lead, avoids problems such as loose clamps and poor contact caused by assembly gaps in traditional external power-taking fixtures.

1. The name of the design product: wall bushing. 2. The use of the design product: pipe installation for fluid handling system clean area. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view 1.