39results about How to "High withstand voltage level" patented technology

The invention relates to a breaker of a direct current system, in particular to a semi-controlled active injection current high voltage direct current breaker and a realization method thereof. The breaker comprises a high speed switch-thyristor module branch, as well as a lightning arrester branch and a bridge circuit which are connected in parallel with the branch, wherein a capacitor-reactor series branch and a resistor-thyristor series branch are connected in parallel and then connected with middle points of two bridge arms of the bridge circuit; and the two ends of a capacitor are connected in parallel with a charging loop. The breaker is based on a direct current breaking principle by the traditional active injection current manner; semi-controlled power electronic devices are added; a high speed mechanical switch is adopted; the advantage of low loss during normal breakover is kept; and bidirectional current can be broken quickly without an arc. The breaker is simple in circuit topological structure, simple and convenient to control, mature in technology, easy to realize, great in current breaking capability, high in withstand voltage level and strong in expansion capability, and the cost is lowered greatly since the number of the adopted power electronic devices is small.

The invention relates to a circuit breaker and a realization method thereof, and particularly relates to a high-voltage DC circuit breaker and a realization method thereof. The DC circuit breaker, based on a secondary current transferring principle, comprises a main branch, a current transferring branch and an energy absorption branch in parallel connection. The DC circuit breaker is serially connected in a DC system. The main branch comprises at least one high-speed mechanical switch K and at least one current transferring module comprising a fully-controlled device in serial connection. The current transferring branch is a bridge circuit formed by thyristor valves, inductors and capacitors. The energy absorption branch is formed by a non-linear resistor. The invention also provides a high-voltage DC circuit breaker realization method. The circuit breaker provided by the invention has a simple topological structure, the control is simple and convenient, used power electronic devices are mainly half-controlled thyristors, the technology is mature, realization is easy, the current breaking ability is large, a voltage-withstanding grade is high, the extension ability is strong, and the cost is greatly reduced.

The invention provides a high voltage direct current circuit breaker topology circuit which comprises a main branch, a current transfer branch and an energy absorption branch. The main branch, the current transfer branch and the energy absorption branch are connected in parallel. According to the high voltage direct current circuit breaker topology circuit provided by the invention, the structure of a circuit topology is simple; a stable current zero crossing point is in a breaking process; and the high voltage direct current circuit breaker topology circuit has the advantages of convenient control, flexible application, easy realization, high current breaking capacity, high withstand voltage level, high expansibility and low equipment cost.

The present invention discloses a cable with a copper core, a copper protecting sleeve and a mineral insulator having the rated voltage of 3kV or below and the manufacturing method thereof. The cable is constituted of conductor 1, covering layer 2 of the conductor, insulating layer 3, copper protecting sleeve 4 and outer protecting sheath 5. In order to obtain the cable with a copper core, a copper protecting sleeve and a mineral insulator, the manufacturing method comprises the steps as follows: providing evenly covering layer 2 of the conductor around conductor 1 to form a conductor core; then filling insulating layer 3 between the conductor core and copper protecting sleeve 4 to form a cable blank; stretching the cable blank consisting of conductor 1, covering layer 2 of the conductor, insulating layer 3 and copper protecting sleeve 4 to reduce its diameter and make insulating layer 3 fully fill up the gap between the conductor core and copper protecting sleeve 4 so as to form the cable. The cable and the method of the invention can increase effectively the insulating property of the cable, so that this cable has the high voltage level, the wide suitable range and the good safety.

The invention relates to a manufacturing process of enamelled copper strap wires, and particularly relates to a manufacturing method of corona-resistant polyimide film sintered enamelled copper strap wires. The manufacturing method comprises the following steps of: processing a copper conductor into a copper strap wire; making the copper strap wire to a 200-grade polyester-imine / polyamide-imide compound type enamelled copper strap wire; and covering a corona-resistant polyimide film on the enamelled copper strap wire and then heating, baking and sintering the enamelled copper strap wire. The manufacturing method combines an enameling process and a glass-coating process, overcomes the limitation of the conventional process, makes up single performance of the existing process, and well combines the enameling process and the glass-coating process; and the product has high corona resistance strength and reaches a high temperature resistance level.

The invention discloses a PTC (Positive Temperature Coefficient) protection element capable of maintaining ultralarge current, which comprises a first external conducting metal pin, a second external conducting metal pin and a resistance PTC chip, wherein the resistance PTC chip is arranged between the first external conducting metal pin and the second external conducting metal pin; the resistance PTC chip comprises (1) at least one crystallinity high polymer material; (2) a conductive filler dispersed in the crystallinity high polymer material, wherein the mass resistivity of the conductive filler is lower than 200[mu]omega.cm, heat conductivity is larger than 10W / (m.k), the particle size is between 0.1[mu]m to 30[mu]m and D50 is not larger than 20[mu]m; (3) and at least two metal electrode foils, wherein the first / second external conducting metal pin is respectively connected to the electrode foils at two faces of the PTC chip. The PTC thermal sensitive element has ultralow electrical resistance property, discharging of high voltage and large current is realized by low specific resistance and high thermal conductivity of the material while overtemperature protection under small current is realized, and application in an accumulator of an electric bicycle is realized.

The invention relates to a bypass protection device for a high-voltage DC circuit breaker and a protection method thereof. The bypass protection device comprises a thyristor valve and a bridge type over-voltage protection circuit. The bridge type over-voltage protection circuit is connected between thyristors in anti-parallel connection with each other inside the thyristor valve. The two ends of each H-bridge sub-module of a main branch are connected in parallel with the thyristor valve. By means of the bypass protection device, during the abnormal shutting of the main branch of the circuit breaker, the circuit breaker is prevented from being damaged under the over-voltage effect of the sub-module. Namely, thyristors are connected in parallel with the sub-module of the main branch, wherein the thyristors are in compression joint in forward and reverse directions. During the normal operation, the current is switched on by a mechanical switch. During the occurrence of a fault, the current of the main branch is converted to the branch of a power electronic device in parallel connection with the main branch. After that, the current is switched off by the power electronic device. During the over-voltage period of the main branch, the thyristors are triggered, so that the current is enabled to pass through the thyristors to form a passageway. Therefore, the main branch is protected.

A novel transposition electrical aluminium wire relates to a winding wire. The aluminium product, a substitute for copper product, is used for supervoltage and ultra-high voltage fields and can reduce eddy current loss in coils and save energy. The wire is characterized by comprising a flat transposition wire, a film insulating layer and a compound insulating layer; the flat transposition wire is a rectangle transposition stranded wire, which consists of a plurality of non-defective single-stranded circular aluminum wires with insulated film lapping layers and arrayed in double layers; the film insulating layer is the insulated film lapping layer; the compound insulating layer is a compound non-woven fabric lapping layer with an insulated film, the film insulating layer is covered at the outside of the flat transposition wire, and the compound insulating layer is covered at the outside of the film insulating layer. The aluminium wire is used for making the windings supervoltage or ultra-high voltage reactors and high voltage electric appliances.

The invention relates to a flat transposed aluminum conductor with a cooling channel. The flat transposed aluminum conductor comprises a flat transposed aluminum conductor core, cooling channel soft copper pipes, a film insulating layer and a composite insulating layer, wherein the flat transposed aluminum conductor core is sequentially wrapped by the film insulating layer and the composite insulating layer. The flat transposed aluminum conductor core is formed by a plurality of defect-free single-stranded round aluminum wires with insulating film taped coverings, namely the flat transposed aluminum conductor core is a multi-layer arrangement disposed rectangular stranded wire. The cooling channel soft copper pipes are multiple soft copper pipes with insulating film taped coverings, the lengths of the soft copper pipes are the same as the lengths of the round aluminum wires, the diameters of the soft copper pipes are the same as the diameters of the single-stranded round aluminum wires in the flat transposed aluminum conductor core, and the soft copper pipes are transversely arranged in the middle of the flat transposed aluminum conductor core to serve as the channel of cooling liquid. The film insulating layer is an insulating film taped covering. The composite insulating layer is a composite non-woven fabric taped covering with an insulating film. According to the flat transposed aluminum conductor, the cooling liquid can carry out circulating cooling in the cooling channel soft copper pipes inside the flat transposed aluminum conductor to directly cool the winding wires, and the flat transposed aluminum conductor is safe and reliable.

The invention relates to a transformer DC (Direct Current) bias magnetic suppression device which comprises a group of capacitors which are connected in parallel. One parallel connection end of the capacitor group is connected in series with a capacitive current transformer ACTA2; the capacitive current transformer ACTA2 is connected with a DC current transformer DCTA and a bypass switch current transformer ACTA1 which are connected in series; voltage transformers TV1 and TV2, a discharging gap and a bypass mechanical switch QF are connected in parallel between the bypass switch current transformer ACTA1 and the other parallel connection end of the capacitor group; both ends of the bypass mechanical switch QF are also connected in parallel with reactors L1 to L3, thyristors T1 to T6 which are respectively connected in series with the reactors L1 to L3 and are reversely connected in parallel and a triggering circuit of the thyristors T1 to T6; and the DC current transformer DCTA, the bypass switch current transformer ACTA1, the voltage transformers TV1 and TV2 and the triggering circuit of the thyristors T1 to T6 are also connected with a measurement and control protection unit. The structure is simplified and the reliability and the intelligence of a system are improved.

This invention relates to one high temperature macromolecule PTC heat sensitive resistance, which is made of conductive macromolecule materials by press, wherein, the materials is added with heat fluro-resin and the layer silicon salt clay through surface process; the formula is as: macromolecule polymer for 30 to 60 percent; carbon for 30 to 55 percent; heat fix fluro-resin for 0.5 to 20 percent; layer silicon salt for 25 to 25 percent; process aid for 0.1 to 10 percent; the macromolecule polymer is of polyvinylidene fluoride, melt politef, ethene perfluoroethylene polymer, nylon 11 and 12, fluorinated ethylenepropylene copolymer and chlorotrifluoroethylene.

The invention provides a novel DC-DC converter which comprises a first bridge arm unit, a second bridge arm unit, a third bridge arm unit, a fourth bridge arm unit, a first reactor and a second reactor, wherein the first bridge arm unit and the second bridge arm unit access to a low-voltage side dc source, the third bridge arm unit and the fourth bridge arm unit access to a high-voltage side dc source, the first bridge arm unit is connected with the second bridge arm unit in series, the third bridge arm unit is connected with the fourth bridge arm unit in series, the other end of the first bridge arm unit is connected with the other end of the third bridge arm unit through the first reactor, the other end of the second bridge arm unit is connected with the other end of the fourth bridge arm unit through the second reactor, and the connecting ends of the first bridge arm unit and the second bridge arm unit are directly connected with the connecting ends of the third bridge arm unit and the fourth bridge arm unit. Compared with the prior art, the novel DC-DC converter is low in cost, small in space and wide in transformation ratio scope and is suitable for mediate and large power situations.

The invention relates to a improved macromolecule PTC thermistor and its manufacturing method. The manufacturing method is that the high polymer, conductive filler, inorganic non-conductive filler, and various auxiliary agents are melted and mixed to form core material by milling device banbury mixer and blender mill; the metal electrode sheet is compounded to the two sides of the core material by press; the composite sheet material is irradiated by the GAMA-ray or electron, its dosage is from 5Mad to 100Mad; then the sheet material is incised into chip with certain size, dipped into the coating liquid, solidify or cooled. After this the high polymer PTC thermistor is made. The invention PTC is made the surface of the material isolate from the air by the coating isolation layer. Thus with high of high voltage resistant.

The invention discloses an antistatic PVC (Polyvinyl Chloride) pipe. The antistatic PVC pipe is characterized by comprising an antistatic inner layer, an antistatic outer layer and a PVC-M middle layer, wherein the composition of the antistatic inner layer and the antistatic outer layer comprises the following components in parts by weight: 100 parts of PVC resin, 0.8-1.2 parts of a heat stabilizer, 4-8 parts of an impact-resistant modifying agent, 1.3-2.0 parts of a lubricant, 5-10 parts of a processing aid and 6 parts of nano-conductive carbon black; and the composition of the PVC-M middle layer comprises the following components in parts by weight: 100 parts of PVC resin, 1.0-1.5 parts of a heat stabilizer, 10-15 parts of an impact-resistant modifying agent, 2.1-3.5 parts of a lubricant and 1.5 parts of filler. The composition of the antistatic PVC pipe disclosed by the invention has the advantages that the strength is higher, the impact resistance can be comparable with that of a polyethylene antistatic coal mine pipe, the modulus reaches 2231MPa, the tensile strength reaches 46.3MPa, the impact strength value of simply supported beams reaches 97.6MPa, the mechanical property is balanced in rigidity and toughness, the permanent antistatic property is achieved, and the requirements for pipes for coal mines are met.

The invention discloses an inflatable type high-voltage relay. The inflatable type high-voltage relay comprises a first insulating sealing shell; a contact is arranged inside the first insulating sealing shell; and the interior of the first insulating sealing shell is inflated with high-pressure gas. Since the interior of the relay can be inflated with the high-pressure gas, a capability of the relay to bear pulse current when a capacitive load is switched on can be improved, and influence of contact bounce on discharge current waveform can be eliminated, and a switch-on service life can be prolonged.

The invention discloses an energy supply device applied to a high-voltage direct-current circuit breaker. According to the energy supply device, an air supply system and a fuel cell are arranged, thefuel cell is connected with a mechanical switch, and energy supply of the mechanical switch is realized in virtue of electric energy generated by the fuel cell. Thus, external power support or supplementation is not need, and the need for multi-stage voltage transformation is eliminated; the energy supply device is simple in design and high in reliability; and by controlling the flow of high-voltage insulating gas and / or the number of the fuel cell, output power can be controlled, so the different energy demands of the mechanical switch can be flexibly met, and energy can be continuously supplied to the mechanical switch. Eventually, the structure of the high-voltage direct-current circuit breaker is simplified; the controllability and voltage tolerance grade of the circuit breaker are improved; and the circuit breaker can withstand a high voltage of 500 kV and realize continuous operation for 10000 h or more.

The utility model discloses a high-voltage cable intermediate joint adopting a gas or oil insulating medium. The high-voltage cable intermediate joint comprises an intermediate joint body made of an insulating material and wire core tubes which are made of the insulating material and are detachably connected with two ends of the intermediate joint body, wherein a middle part of the middle joint body is hollow to form a sealed medium cabin, a medium injection port communicated with the medium cabin is arranged on the intermediate joint body, two ends of the intermediate joint body are connecting ends, connecting holes communicated with the medium cabin are arranged in the connecting ends of the intermediate joint body, a conductive rod is arranged in the middle of a medium cabin, and two ends of the conductive rod are fixed in the two connecting holes. The high-voltage cable intermediate joint is advantaged in that the high-voltage cable intermediate joint is good in universality, highin withstand voltage level and long in connection distance, maintenance efficiency is greatly improved, and maintenance cost is reduced.

The invention discloses an energy supply system usable under high voltage and an energy supply method thereof. The energy supply method comprises the following steps: acquiring high-voltage insulatinggas at first; then conveying the high-voltage insulating gas to the interior of a fuel cell through an insulated pipeline; and finally, generating electric energy via the fuel cell to supply energy to energy-demanding devices. Thus, external power support or supplementation is not need, and the need for multi-stage voltage transformation is eliminated. The energy supply system is simple in designand high in reliability; and by controlling the flow of high-voltage insulating gas and / or the number of the fuel cell, output power can be controlled, so the different energy demands of the energy-demanding devices can be flexibly met, and energy can be continuously supplied to the energy-demanding devices.

The invention provides a polyimide film cold-pressed composite busbar for an automobile capacitor and a preparation method of the polyimide film cold-pressed composite busbar. The composite busbar comprises an upper busbar unit and a lower busbar unit, wherein the upper busbar unit comprises an L-shaped upper busbar and an upper busbar insulating film, the L-shaped upper busbar comprises an upper busbar vertical plate and an upper busbar horizontal plate, the upper busbar insulating film is attached to the inner side of the upper busbar vertical plate; the lower busbar unit comprises an L-shaped lower busbar and a lower busbar insulating film, the L-shaped lower busbar comprises a lower busbar vertical plate and a lower busbar horizontal plate, the lower busbar vertical plate comprises a lower busbar positioning plate and a connecting plate which are located on the upper side, and the lower busbar insulating film is attached to the inner side of the lower busbar positioning plate; and the upper busbar insulating film and the lower busbar insulating film are both made of polyimide. The composite busbar provided by the invention solves the problems of insufficient high-temperature-resistant grade, insufficient high-voltage-resistant grade, insufficient wear resistance, early failure and the like in the prior art.

The invention relates to a circuit breaker and a realization method thereof, and specifically relates to a mixed high-voltage direct-current circuit breaker and a realization method thereof. The direct-current circuit breaker is based on the principle of secondary current transfer. A main branch is composed of a quick-action mechanical switch and a current transfer module which contains a full-controlled device, which ensures the advantages of low loss and flexible current transfer control in the state of normal conduction. A first current transfer branch is composed of half-controlled device thyristors connected in series, so that the circuit breaker has strong fault flow capacity and breaking capacity, 'zero voltage and zero current' of the mechanical switch can be maintained long enough, and arc-free switching of the mechanical switch is realized. A second current transfer branch is composed of capacitors with pre-charged voltage, an inductor, and series-connected thyristors. After the thyristors of the first current transfer branch are reliably switched off, the capacitors quickly build up direct voltage high enough to resist the system, and an energy absorption circuit limits the voltage of the capacitors. Thus, the size and cost of the capacitors are well controlled.

A high-voltage cable intermediate joint using a gas or oil insulating medium, comprising an intermediate joint body made of insulating material and a wire core tube made of insulating material and detachably connected to both ends of the intermediate joint body, the intermediate joint body The middle part of the middle part is hollow to form a sealed medium compartment. The medium joint body is provided with a medium injection port communicating with the medium compartment. The two ends of the intermediate joint body are connecting ends. The hole is connected with the medium cabin, and the middle part of the medium cabin is provided with a conductive rod, and the two ends of the conductive rod are fixed in the two connection holes. This device has good versatility, high withstand voltage level, and long connection distance, which greatly improves the Maintenance efficiency reduces maintenance costs.