62results about How to "Increase electrical clearance" patented technology

The invention discloses a construction method for reducing temperature rise at an electrician busbar lap joint part, belonging to the field of electrical equipment, and specifically relates to construction and installation of an electrician busbar. The connection column is provided with a first cylindrical portion which is in interference fit with a pre-drilled hole in an electrician busbar, wherein the first cylindrical portion is provided with conductivity; a second cylindrical portion with conductivity is coaxially arranged in the first cylindrical portion; the first cylindrical portion is in interference fit with the second cylindrical portion; and the thermal expansion coefficient of the second cylindrical portion is greater than the thermal expansion coefficient of the first cylindrical portion. The connection column has the advantages that 1) the same lap joint length can generate larger conductive area, so that the current density can be reduced and the low temperature rise of the busbar can be realized; 2) the use level of the busbar is reduced so that the resource is saved; 3) the electric clearance or the phase spacing can be enlarged, so that the electrical safety of equipment is improved; and 4) the wiring width of the busbar is reduced, so that the occupied space of the busbar can be reduced.

The invention discloses a design method of a connecting column for reducing temperature rise at an overlap position between electric bus bars, belongs to the field of power equipment, and particularly relates to a design method of a connecting column. The design method of the connecting column disclosed by the invention comprises the following steps: providing first columnar parts which are in interference fit with prefabricated holes in the electric bus bars, wherein the first columnar parts are electrically conductive; coaxially arranging second columnar parts which are electrically conductive in the first columnar parts; making the first columnar parts be in interference fit with the second columnar parts; and making thermal expansion coefficients of the second columnar parts be greater than the thermal expansion coefficients of the first columnar parts. The connecting column made by the design method disclosed by the invention has the beneficial effects that 1, more electric conduction area is formed at a same overlap length, so that the current density is lowered, and low temperature rise of the bus bars is realized; 2, a using quantity of the bus bars is reduced, and resources are saved; 3, electric clearances or space distances are increased, and the electrical safety of equipment is enhanced; and 4, arrangement widths of the bus bars are reduced, so that space occupied by the bus bars can be reduced.

The invention relates to a motor, in particular to a permanent-magnet synchronous traction motor for a motor train. The permanent-magnet synchronous traction motor for the motor train solves the problem that an existing permanent-magnet synchronous motor is not suitable for being directly used as a permanent-magnet synchronous traction motor for a motor train due to structure defects. The motor adopts a novel rotor magnetic circuit structure punching plate, a high-integration compact type rotor structure, a detachable connecting box structure and a lead structure. A connecting box can be conveniently disassembled so that the motor can be installed easily. A U-shaped magnetic circuit permanent magnet structure of an inner rotor is adopted, the magnetic separation bridge and circular bead design is added, and therefore the start and overload capacity of the motor can be improved. A rotor pressing ring at the driving end integrates rotor core pressing, permanent magnet end face pressing, rotor dynamic balancing and an inner seal ring labyrinth seal structure into a whole, the advantages that the structure is compact, the axial occupied space is small, and the installation is convenient are achieved, and the motor can be widely applied in the field of locomotive trains. According to the research, development and the operation of the permanent-magnet synchronous traction motor for the motor train, realistic bases are supplied for the permanent-magnet motor to research and develop a permanent-magnet traction motor structure with higher power, higher rotation speed and higher power density.

The invention discloses a design method for an integrated fixed contact of an electric power switch, belongs to the field of an electric power device, and specifically relates to the design method for the integrated fixed contact. The method comprises following steps of providing a contact end and a connection end; designing the contact end and the connection end as a continuous and integrated structure; arranging a connection column at the connection end; enabling the connection column to be embedded into the connection end partially; enabling the connection column to be in interference fit with the connection end; arranging a first columnar part on the connection column, wherein the first columnar part is in interference fit with an electric power busbar and is conductive; arranging a second columnar part with conductivity in the first columnar part coaxially; enabling the first columnar part and the second columnar part to be in interference fit; and enabling the thermal expansion coefficient of the second columnar part to be greater than that of the second columnar part. The integrated fixed contact disclosed by the invention has the advantages that 1, more conductive area is produced by using the same overlapping length; further the current density is reduced; low temperature rise of the connection end is realized; 2, the usage of the busbar is reduced; the resource is saved; 3, the electric clearance or security distance is improved; and the electrical security of the device is improved.

The invention relates to a shielding and isolating technology between an IGBT (Insulated Gate Bipolar Translator) and a driving unit, in particular to a composite shielding device for the driving circuit. According to the composite shielding device, the technical problems that electromagnetic interference between the IGBT and the driving unit cannot be completely shielded and high-voltage interference cannot be isolated at present are solved. The composite shielding device for the driving circuit comprises a layer of metal shielding plate, two layers of insulating plates and an insulating protective film for performing pressing seal on the three layers of plates to form a whole; the metal shielding plate is produced by processing a 6061 aluminum-alloy sheet with the thickness of 1 to 1.5mm; insulating layers with the thickness of 1 to 1.5mm, which are made by processing insulating materials GPO-3, are tightly adhered to two sides of the metal shielding plate; a metal shielding layer and two insulating layers are enabled to form a whole by using the high-voltage-resisting insulating protective film in a pressing seal manner; a driving plate mounting hole is formed in the composite shielding plate; metal parts on the upper side, the lower side, the left side and the right side of the metal layer outwards extend in sections; mounting holes are formed in the corresponding extending parts. According to the composite shielding device disclosed by the invention, the interference of an alternating magnetic field on a low-voltage signal of the driving plate can be reduced, the working reliability of the IGBT is improved, and electrical voltage-resisting insulating conditions of 10,000V can be met.

The invention discloses a dry-type electric transformer and belongs to the field of power equipment.A connecting column is arranged at the low-voltage output end of the dry-type electric transformer, part of the connecting column is embedded into the low-voltage output end and is in interference fit with the low-voltage output end, the connecting column is provided with a first conductive columnar part in interference fit with a power busbar, a second conductive columnar part is coaxially arranged in the first columnar part, the first columnar part and the second columnar part are in interference fit, and the thermal coefficient of expansion of the second columnar part is larger than that of the first columnar part.The transformer has the advantages that a larger conductive area is generated by the same lap joint length, then the current density is reduced, and low temperature rise of the low-voltage output end is achieved; the use number of busbars is reduced, and resources are saved; the electrical clearance or the safe distance is increased, and the electrical safety of the equipment is improved.

The invention provides a switch power supply suitable for a high-overvoltage-grade high-altitude place. The switch power supply comprises a DC bus voltage input, an open-loop isolation DC / DC circuit and a closed-loop isolation DC / DC circuit; an input end of the DC bus voltage input is connected with a DC bus of electric power equipment, and an output end is connected with the open-loop isolation DC / DC circuit; and an output end of the open-loop isolation DC / DC circuit is connected with the closed-loop isolation DC / DC circuit, and an output end of the closed-loop isolation DC / DC circuit outputs an output voltage Vo. The switch power supply adopts two stages of the isolation DC / DC circuits, the former stage is in an open-loop state, and the latter stage is in a closed-loop state; the switch power supply can achieve a large electric gap and a creepage distance, and then the switch power supply can be suitable for the high-overvoltage-grade high-altitude place; and the switch power supply can compatibly and simultaneously take electricity from the DC bus and an external input power supply, and the switch power supply is ensured to be capable of continuously providing power in certain conditions.

A roof high-voltage box installation structure is disclosed. A high-voltage box adopts a glass fiber reinforced plastics top cover. A laminated board is laid on an inner bottom surface of the high-voltage box. An inner surface of the glass fiber reinforced plastics top cover is sprayed with an anti-pollution flashover coating layer. A vacuum main circuit breaker, a voltage transformer, a current transformer, a disconnecting switch, a lightning arrester and three high-voltage cable heads are integrated in the box. A high voltage power supply of a motor train unit is introduced into the high-voltage box by a first high-voltage cable head and is divided into two branches. One branch enters into the voltage transformer. The other branch passes through the vacuum main circuit breaker and then is divided into two branches. One branch is led out by a second high-voltage cable head and the other branch passes through a high-voltage disconnecting switch and is led out by a third high-voltage cable head. The current transformer sleeves the first high-voltage cable head and collects current signals. The lightning arrester, the disconnecting switch and the second high-voltage cable head are connected in parallel. By using the structure of the invention, an influence of an environment on electrical performance of a high voltage component is avoided. Cleaning frequencies are reduced, and manpower and water sources are saved. In addition, an influence of cleaning on the high voltage component is reduced. Discharging performance of an electric appliance is decreased. An insulating plate is laid on the inner bottom surface of the high-voltage box so that an electric clearance between a high voltage wiring point and ground of a high-voltage box body is increased.

The invention provides an arc extinguishing system and a circuit breaker. The arc extinguishing system comprises a contact device which comprises a static contact and a moving contact, the static contact is provided with a contact plate, a conductive frame and a contact point which are connected in sequence, and the moving contact can be in contact with or separated from the contact point; the arc extinguishing system further comprises an arc extinguishing shell which is provided with an arc extinguishing chamber for inserting the moving contact and an insulating assembly for separating the conductive frame from the moving contact, and the conductive frame is arranged outside the arc extinguishing shell. The arc extinguishing system can overcome the defects that in the prior art, the insulating effect of the moving contact and the static contact is poor, short circuit is easily formed during breaking, and a breaking test fails.

The invention discloses laminated busbars and a frequency converter. The frequency converter comprises the laminated busbars, wherein the laminated busbars comprise a positive busbar, a negative busbar and an insulating plate mounted between the positive busbar and the negative busbar; the negative busbar comprises a first connecting part used for connecting an IGBT (Insulated Gate Bipolar Transistor) module, and a second connecting part used for connecting a capacitor; the side, close to the IGBT module, of the negative busbar and / or the side, close to the capacitor, of the negative busbar are bent to the direction which is deviated from the positive busbar, so that a gap used for improving the creepage distance between the positive busbar and the negative busbar is formed between the first connecting part and the insulating plate and / or between the second connecting part and the insulating plate. The implementation of the laminated busbars and the frequency converter has the benefits that the laminated busbars adopt the structure that the side, close to the IGBT module, of the negative busbar and / or the side, close to the capacitor, of the negative busbar are bent to the direction which is deviated from the positive busbar, so that the creepage distance and the electric clearance between the positive busbar and the negative busbar can be improved.

The invention discloses a single-phase self-recovery type overvoltage / undervoltage protector which comprises the components of an upper cover, a base, an N-pole assembly, a relay assembly, a control circuit board, and two sets of wire inlet / outlet terminals. The upper cover is correspondingly connected with the base. The control circuit board, the relay assembly and the N-pole assembly are mounted on the base and are accommodated in a space which is between the upper cover and the base. One set of wire inlet / outlet terminal is connected with the N-pole assembly, and the other set of wire inlet / outlet terminals is connected with the relay pin of the relay assembly. The base is internally provided with a mounting part for mounting the relay. In the mounting part, a position between two relay pins which correspond with the relay assembly is provided with a retaining wall which is used for increasing a creepage distance between the two relay pins. According to the single-phase self-recovery type overvoltage / undervoltage protector, through improving the structure of the base, the creepage distance between the two relay pins can be increased. A hidden trouble of incapability of switching off a main line is eliminated on condition that main circuit switching-off is required. Furthermore an effect of stably supporting the relay assembly is realized.

The invention discloses a motor driving controller and a direct-current pump with the motor driving controller; the motor driving controller comprises a controller box and a motor circuit board positioned in the controller box; the controller box comprises a box body and a box cover; an inlet port and an outlet port electrically connected with the motor circuit board are arranged on the side wallof the box body; the motor driving controller further comprises at least one power device arranged on the lower surface of the motor circuit board; a lug boss corresponding to the power device is arranged on the inside surface of the bottom of the box body; and the surface of the power device is appressed to the lug boss. The controller is specifically connected with the controller box through thepower device in the circuit board; the controller box is used as the radiator of the power device; the heat dissipation effect of the power device is effectively ensured; and the service life of thecircuit board is prolonged easily.

The invention relates to a three-in-one motor control device integrating a speed reducer, a motor and a controller, wherein the speed reducer is fixed at one side end of the motor, and the controller comprises a shell, an IGBT, a thin-film capacitor, a PCBA-circuit board, a three-phase output copper bar, a current sensor assembly, a magnetic ring assembly, a high-voltage bus connector, a high-voltage branching connector and a signal connector. The shell comprises a box cover and a flat box body and is fixed above the motor, the high-voltage bus connector, the high-voltage branching connector and the signal connector are all fixed on the same side wall of the box body, and the IGBT, the thin-film capacitor, the PCBA-circuit board, the three-phase output copper bar, the current sensor assembly and the magnetic ring assembly are all fixed on a bottom plate in the box body, and are distributed in the shell in four rows. Compared with the prior art, the overall structure of the device is flattened, the power density is high, the space in a vehicle can be saved, the overall gravity center of the device can be lowered, and the working stability of the device is improved.

The invention discloses an isolating switch operated on the front side, which belongs to the field of power devices and particularly relates to an isolating switch operated on the front side. The isolating switch disclosed by the invention comprises a contact room, a handle arranged on the front side of the switch and wiring terminals connected with static contacts. A connection column is arranged on the wiring terminal, the connection column is partially embedded in the wiring terminal and in interference fit with the wiring terminal, a conductive first column-shaped part in interference fit with a power busbar is arranged on the connection column, the first column-shaped part is internally coaxially provided with a second conductive column-shaped part, the first column-shaped part and the second column-shaped part are in interference fit, and the thermal expansion coefficient of the second column-shaped part is larger than that of the first column-shaped part. The isolating switch disclosed by the invention has the following beneficial effects that a more conductive area can be generated with the same overlapping length, the current density is further reduced, and low temperature rise of the wiring terminal is realized; usage of busbars can be reduced, and resources are saved; and electrical clearance or the safety distance is increased, and the electrical safety of the device is improved.

The invention provides a miniature fuse type isolating switch, which comprises a plurality of contacts arranged on a base, an elastic contact part capable of being clamped with a fusible core being arranged at one end of each contact, the other end of each contact being connected with a wiring terminal, and a first partition plate being arranged between every two adjacent wiring terminals; and a second partition plate, arranged between the two adjacent contacts, the left end surface of the second partition plate exceeding the elastic contact part, and the right end surface of the second partition plate extending into an inner cavity formed by the two adjacent first partition plates. By lengthening the end faces of the two sides of the second partition plate, the creepage distance and the electrical gap between every two adjacent contacts are increased, then the rated stamping withstand voltage and the rated insulation voltage of the product are improved, and the use requirements of customers in some special occasions are met.

The invention provides an outdoor vertical type vacuum circuit breaker. According to the outdoor vertical type vacuum circuit breaker, an upper flange of an upper insulator and a lower flange of a lower insulator are wrapped in a silicone rubber shell, so that the original electric clearance and the original creep distance are increased, and the interelectrode external insulation capacity and the ground insulation capacity are improved; in addition, insulation covers are arranged on a high-voltage input port of an upper busbar assembly and a high-voltage output port of a lower busbar assembly respectively, an air path between the upper busbar and the lower busbar is blocked, and then the interelectrode external insulation capacity and the ground insulation capacity are further improved; furthermore, due to the fact that a corrugated pipe is arranged between the lower insulator and a base plate assembly, compared with an existing sealing ring, the outdoor vertical type vacuum circuit breaker has the advantages that a sealed isolation cavity can be formed, the creep distance and the electric clearance are increased, the ground insulation capacity is improved, and the requirement for the level of outdoor protection is met.

The invention discloses an electromagnetic relay for dual-power switching. The electromagnetic relay comprises a base, a sliding block, a contact portion and a magnetic circuit portion; the magnetic circuit portion is arranged on the base, the sliding block is arranged on the base in a sliding mode; the magnetic circuit portion is provided with a pushing arm and is matched with the sliding block,so as to drive the sliding block to move back and forth; the contact part comprises at least two movable springs and at least four static springs; the static springs are arranged on the base and are symmetrically distributed on the two sides of the moving direction of the sliding block in a symmetric manner; the movable reeds are of a straight-piece type structure and are rigid movable springs, and the middle parts of the movable reeds are inserted into the sliding block, and the two ends of each movable reed are fixedly connected with a movable contact in a single-side mode and are matched with static contacts of corresponding static reeds on the two sides of the sliding block. The electromagnetic relay has the advantages of being long in electrical gap between the contact sets and shortin flight time, so that a sufficient isolation requirement between the conversion power sources can be met, the magnetic circuit air gap is reduced, and rapid switching between the conversion power sources is realized.

The invention discloses a design method for a power transformer low voltage side outlet apparatus, and belongs to the field of power equipment. The design method for the outlet apparatus, disclosed by the invention, comprises the steps of providing a clamping end matched with a low-voltage connection pole and a connecting end matched with a power busbar, and enabling the clamping end and the connecting end to be integrally formed; and arranging a connecting column at the connecting end, enabling the connecting column to be partially embedded in the connecting end and to be in interference fit with the connecting end, arranging a first conductive columnar part in interference fit with the power busbar on the connecting column, coaxially arranging a second conductive columnar part in the first columnar part, enabling the first columnar part to be in interference fit with the second columnar part, and enabling a thermal expansion coefficient of the second columnar part to be greater than that of the first columnar part. The design method disclosed by the invention has the following beneficial effects: 1, more conductive areas are generated under the same lap length, so that the current density is reduced and low temperature rise of the connecting end is realized; 2, the busbar consumption is reduced and resources are saved; and 3, an electric clearance is expanded or a safety distance is increased, and the electric safety of the equipment is improved.

The invention discloses a main and standby power supply switching circuit. An arranged inboard power circuit can provide a switching execution circuit and a main control circuit with adaptive workingvoltage, so that the main control circuit can control a switch drive chip; and through the arrangement of the switch drive chip, control of a zero line control switch and a fire line control switch can be more convenient, and the circuit is simplified. Therefore, compared with an existing power supply switching circuit of which a double-pole double-throw relay is connected to zero lines and fire lines of a main power supply and a standby power supply at the same time, the main and standby power supply switching circuit disclosed by the invention has the advantages that the zero line control switch outputs a main circuit zero line or a standby circuit zero line, and the fire line control switch outputs a main circuit fire line or a standby circuit fire line, so that power lines can be far away from each other; and furthermore, the fire line control switch only controls on / off of the fire lines of the main power supply and the standby power supply, and the zero line control switch only controls on / off of the zero lines of the main power supply and the standby power supply, so that the relay is prevented from generating an electric arc.

The invention discloses a design method for a dual-power electric change-over switch, belongs to the field of electrical equipment, and in particular relates to the design method for the dual-power electric change-over switch. The design method comprises the steps of arranging an electric operating mechanism provided with an electromagnet and a triggering button, and a contact chamber provided with two power supply wiring terminals and a load wiring terminal; arranging a linking post on each wiring terminal, thus allowing the linking post to be partly embedded into the wiring terminal and in interference fit with the wiring terminal; and arranging a first conductive columnar part in interference fit with a power bus on each linking post, and arranging a second conductive columnar part in the first columnar part in a coaxial manner, and thereby the first and second columnar parts being in interference fit with each other, and the thermal expansion coefficient of the second columnar part being more than that of the first columnar part. The design method disclosed by the invention has the advantages that 1, the more conductive areas are generated with the same splicing length, so that the current density is reduced, and the low temperature rise of the wiring terminal is achieved; 2, the consumption of the buses is reduced, and the resources are saved; and 3, the electric clearance or safe distance is increased, and the electrical security of the equipment is improved.

The invention discloses a junction device. The junction device comprises one or more sleeve components which are arranged side by side. Each sleeve component comprises a sleeve rod, a sleeve rod head, an outer sleeve and an elastic element. One end of each sleeve rod head is connected with one sleeve rod and the other end of each sleeve rod head is in butt joint with an electrical connection component of a wiring board. Each sleeve rod is sleeved with one outer sleeve. Each elastic element is arranged between one outer sleeve and one sleeve rod. Each sleeve rod head is a cup-shaped cylinder. Each cup-shaped cylinder comprises a sleeve rod head post gap. The periphery of each sleeve rod head post gap is composed of two opposite arc surface portions and two parallel plane portions. The junction device has the advantages of being good in universality, low in requirement for machining and assembly precision, and capable of effectively enlarging an electrical gap. In addition, the junction device is simple in structure and high in safety.

The invention provides a high-voltage switch cabinet capable of changing the position of a grounding switch and the position of a current transformer, and relates to the technical field of switch cabinets. The high-voltage switch cabinet is used as a distribution device for receiving or distributing power supplies. A bus chamber, a breaker chamber and a cable chamber are arranged on the upper portion in the switch cabinet, wherein the breaker chamber is located on one side of the bus chamber, the cable chamber is located below the bus chamber, bus bars are installed in the bus chamber, and an incoming and outgoing cable is led out of the cable chamber. The current transformer is installed below the bus chamber. A lower partition plate is arranged in the cable chamber. An operating shaft is installed below the breaker chamber, part of the operating shaft is located in the cable chamber, and the part, located in the cable chamber, of the operating shaft is connected with the grounding switch which is transversely and vertically installed on the lower partition plate. By the adoption of the high-voltage switch cabinet, electric clearance between the grounding switch, the current transformer and the outgoing cable is increased, safety of the electric clearance is higher, and space is more reasonable after the installing positions of elements of the cable chamber are changed.

The invention discloses a dual-power automatic change-over switch, belongs to the field of electrical equipment, and in particular relates to the dual-power automatic change-over switch, comprising an automatic operating mechanism provided with a sampling unit, a control unit and an electromagnet, and a contact chamber provided with wiring terminals that comprise two power supply wiring terminals and a load wiring terminal, wherein each wiring terminal is provided with a linking post, the linking post is partly embedded into the wiring terminal and in interference fit with the wiring terminal, the linking post is provided with a first conductive columnar part in interference fit with a power bus, a second conductive columnar part is coaxially arranged in the first columnar part, the first and second columnar parts are in interference fit with each other, and the thermal expansion coefficient of the second columnar part is more than that of the first columnar part. The switch disclosed by the invention has the advantages that 1, the more conductive areas are generated with the same splicing length, and thus the current density is reduced, and the lower temperature rise of the wiring terminal is achieved; 2, the consumption of the buses is reduced, and the resources are saved; and 3, the electric clearance or safe distance is increased, and the electrical security of the equipment is improved.

The invention relates to a motor, in particular to a permanent-magnet synchronous traction motor for a motor train. The permanent-magnet synchronous traction motor for the motor train solves the problem that an existing permanent-magnet synchronous motor is not suitable for being directly used as a permanent-magnet synchronous traction motor for a motor train due to structure defects. The motor adopts a novel rotor magnetic circuit structure punching plate, a high-integration compact type rotor structure, a detachable connecting box structure and a lead structure. A connecting box can be conveniently disassembled so that the motor can be installed easily. A U-shaped magnetic circuit permanent magnet structure of an inner rotor is adopted, the magnetic separation bridge and circular bead design is added, and therefore the start and overload capacity of the motor can be improved. A rotor pressing ring at the driving end integrates rotor core pressing, permanent magnet end face pressing, rotor dynamic balancing and an inner seal ring labyrinth seal structure into a whole, the advantages that the structure is compact, the axial occupied space is small, and the installation is convenient are achieved, and the motor can be widely applied in the field of locomotive trains. According to the research, development and the operation of the permanent-magnet synchronous traction motor for the motor train, realistic bases are supplied for the permanent-magnet motor to research and develop a permanent-magnet traction motor structure with higher power, higher rotation speed and higher power density.

The invention discloses a side operated isolation switch, belonging to the field of power equipment. The isolation switch disclosed by the invention comprises a contact room, a handle and wiring terminals, wherein the handle is arranged on the side surface of the switch; the wiring terminals are connected with a static contact; the wiring terminals are provided with connection columns; the connection columns are partly embedded in the wiring terminal and in interference fit with the wiring terminal; each of the connection columns is provided with a first conductive columnar part in interference fit with a power busbar; a second conductive columnar part is coaxially arranged in the first columnar part; the first columnar part and the second columnar part are in interference fit; and the thermal expansion coefficient of the second columnar part is greater than the thermal expansion coefficient of the first columnar part. The isolation switch disclosed by the invention has the following beneficial effects: a relatively large conductive area is generated through the same splicing length; therefore, the current density is reduced; low temperature rise of the wiring terminals is realized; the use amount of the busbar is reduced, such that resources are saved; and the electric clearance or the safe distance is enlarged, such that the electric safety of the equipment is improved.

The invention discloses an oil-immersed power transformer, belongs to the field of power equipment and particularly relates to the oil-immersed power transformer. A coupling column is arranged at a low-voltage output end of the oil-immersed power transformer; the coupling column is partially embedded into the low-voltage output end and is in interference fit with the low-voltage output end; the coupling column is provided with a conducting first columnar part in interference fit with a power bus; a second columnar part with conductivity is coaxially arranged in the first columnar part; the first columnar part and the second columnar part are in interference fit; and the thermal expansion coefficient of the second columnar part is greater than that of the first columnar part. The transformer disclosed by the invention has the beneficial effects that (1) more conducting area is generated by the same overlapping length, so that the current density is reduced and a low temperature rise of the low-voltage output end is achieved; (2) the usage amount of the bus is reduced and resources are saved; and (3) the electric clearance or the safety distance is increased and the electric safety of equipment is improved.

The invention discloses a design method for a frame circuit breaker and belongs to the field of electrical equipment. The design method includes the steps that an insulating base, a terminal, a fixed contact, a moving contact, an operating mechanism, an energy storage mechanism, a controller and a rotating mechanism are provided, and the terminal is partially exposed out of the insulating base; a connecting post is arranged on the terminal, the connecting post is partially embedded into the terminal and is in interference fit with the terminal, a first conductive columnar part in interference fit with a power busbar is arranged on the connecting post, a second conductive columnar part is coaxially arranged inside the first columnar part, the first columnar part and the second columnar part are in interference fit, and the thermal expansion coefficient of the second columnar part is larger than that of the first columnar part. The design method has the advantages that a larger conduction area is generated through the same lap joint length, then current density is reduced, and low temperature rise of the terminal is achieved; the use number of busbars is reduced, and resources are saved; the electrical clearance or safety distance is increased, and the electrical safety of equipment is improved.

The invention provides an adapter structure and a connector including the same. The adapter structure comprises a main connector, a sub-connector, a first socket contact member and a second socket contact member, wherein the main connector is provided with a through insertion hole and a through first mounting hole; the first socket contact member is installed in the first mounting hole; the sub-connector is provided with a through second mounting hole; the second socket contact member is installed in the second mounting hole; the first end of the sub-connector is embedded in the insertion hole; and the second end of the sub-connector extends out of the insertion hole. The main connector and the sub-connector are nested to form the split-type adapter structure. The first socket contact member extends out of the first mounting hole end and is soldered to a line on a main printed board inside the controller. The second socket contact member extends out of the second mounting hole end to be soldered to a line on a sub-printed board inside the controller. Thus, a purpose of replacing the wires of internal components of the controller with a printed circuit can be well achieved.

The invention discloses a frequency converter and an insulation device of an IGBT (Insulated Gate Bipolar Transistor) wiring terminal. The insulation device is provided with two terminal containing grooves corresponding to two wiring terminals at one end of an IGBT, wherein a fixing plate corresponding to a gap between the two wiring terminals is arranged between the two terminal containing grooves; fixing screws used for mounting and fixing are arranged at one end of the IGBT; and the insulation device is provided with bolt baffle plates for covering the fixing screws in a stretching manner. The frequency converter comprises the insulation device of the IGBT wiring terminal. The insulation device is inserted into the gap of the two wiring terminals at one end of the IGBT by the fixing plate in the middle for fixing, so that the insulation device can be well mounted and fixed; and the bolt baffle plates for covering the fixing screws are arranged on the two sides of the insulation device, so that creepage distances between the wiring terminals and the fixing screws are increased. In addition, the insulation device also increases creepage distances between the fixing screws and a positive copper bar and between the fixing screws and a negative copper bar.

The invention discloses a high-voltage insulation gas circuit distributor for a high-speed motor train unit. The high-voltage insulation gas circuit distributor comprises a distributor body, an upper-end connecting part, a lower-end connecting part, a gas channel core body and outer insulation umbrella groups, wherein the upper-end connecting part and the lower-end connecting part are arranged at the two ends of the distributor body; the outer insulation umbrella groups are distributed on the periphery end of the distributor and are integrally injection molded with the distributor body; the gas channel core body is arranged at the inner end of the distributor body; each of the port of the upper-end connecting part and the port of the lower-end connecting part is provided with a plurality of gas channels with trapezoidal sealing grooves which enable the gas channel core body to be in close fit with the gas channels of the upper-end and lower-end connecting parts, and enable the gas channels to communicate with the gas channel core body. The high-voltage insulation gas circuit distributor has the following characteristics that the sealing property is good; the distributor is capable of bearing the severe outdoor conditions, such as acute radiation of ultraviolet rays, salt mist, fine sand flying up in the air, high and low temperature change in the south and north areas and haze weather and has good anti-creepage trace, flame retardance and hydrophobicity; and the reliability and economy of the product can be ensured.