136results about How to "Improve the insulation level" patented technology

The invention discloses arc extinguish chambers of a high voltage alternating current SF6 pot-type breaker. The invention is characterized in that an arc extinguish chamber system comprises a shell with the arc extinguish chambers, plum blossom contact systems, fixed contact systems, capacitor assembling units, air cylinder systems, a mechanical drive system, ion capturing systems, compressed airpiston assembling units, intermediate contact assembling units, insulation supporting bars, moving end large shields and fixed end large shields; the arc extinguish chambers are of double-break structure and are symmetrically distributed, with the mechanical drive system as the center; the middle mechanical drive system moves along the vertical direction; and vertical movement of the mechanical drive system is transformed to horizontal movement through crankarms and connecting rods in the mechanical drive system to drive the two air cylinder systems of the arc extinguish chambers to move horizontally to switch off and switch on the switchgear. Through promoting the technology of the integral arc extinguish chamber of the breaker, the arc extinguish chambers have more uniform electrical field, high insulation level, stronger breaking capability and high current-carrying capability and is safer to operate.

A 10kV power distribution circuit insulation tower head is disclosed, which is characterized in that: adopting hydrophobic high-strength insulation bar to be assembled with needle-typed insulator by gold tool and form an insulation tower head entity, or adopting hydrophobic high-strength insulation bar to be assembled with gold tool directly and form an insulation tower head. By using the invention, the insulation level of the power distribution circuit can be greatly improved, the thunder discharge air gap can be obviously enlarged, the lightning stroke and line break accidents can be effectively prevented and the climbing distance can be expanded, further, the structure type is easy to improve self-cleaning ability and the occurrence of pollution flashover can be basically and completely precluded, which is beneficial in charged operation, simple in operation process and improves the operation security.

The invention relates to a voltage transformer, comprising a winding part wound on an iron core, wherein the winding part and the iron core are both sealed in an insulator, the voltage transformer is characterized in that the winding part comprises a secondary winding directly wound on an external surface of the iron core, an insulating layer wound on an external surface of the second winding, a primary winding wound on an external surface of the insulating layer, and a grading ring wound on an external surface of the primary winding. Compared with the prior art, the voltage transformer of the invention has the following advantages: insulation level of a tail end of the primary winding is improved to 20kV so as to satisfy high voltage caused by voltage division of a resonance eliminator, secondary load is large, precision is high, surface creepage distance is large, the grading ring is placed on the primary winding, and the iron core is covered with semiconductor materials, so that the whole product has uniform electric field and has no suspension potential. If the product has unsatisfactory error after casting, the product can be adjusted by externally adding a compensation coil so as to achieve optimal state of the error.

The invention discloses a composite material tower, which comprises a body, a first outer layer, a second outer layer and a foam filter placed in the body, wherein the first outer layer and the second outer layer are positioned outside the body; the body is made of a composite material of a resin and insulating fibers; the first outer layer is made of a composite material of weatherproof resin and insulating fibers; the second outer layer is made of inorganic paint; and the body, the first outer layer, the second outer layer and the foam filter in the body form the composite material tower. The composite material tower provided by the invention is very suitable for long-term operated under various outdoor severe weather conditions as the adopted cycloaliphatic epoxy resin and inorganic paint have excellent uvioresistant, waterproof, dampproof, non-adhesive, self-cleaning and electrical insulating properties.

The invention relates to a busbar connector used in a gas-insulated metal-enclosed switchgear of 24 kV or less than 24 kV. The busbar connector mainly comprises a rubber sleeve, a spring, a sectorial wafer, a grid plate, a ground wire group and aluminum tubes, wherein the sectorial wafer is arranged inside a clamping groove of the grid plate, and the sectorial wafer and the grid plate are fixed with each other by the spring to form a sectorial contact; and the aluminum tubes are arranged on both ends of an inner cavity of the rubber sleeve, the sectorial contact is inserted into the rubber sleeve, and the ground wire group is arranged in the middle of the outer surface of the rubber sleeve, so that the busbar connector is formed. The gas-insulated metal-enclosed switchgear of 24 kV or less than 24 kV using the busbar connector to assemble machine cabinets has good discharge current capability, a compact structure, reliable quality and superior insulating property, and improves the stability and the safety of equipment operation.

The invention relates to an unloading off-circuit tapping switch used in a transformer, comprising an upper pedestal, a lower pedestal and a rotary shaft which penetrates through the upper and lower pedestals, the rotary shaft is provided with a support piece and a moving contact assembly, an insulator is linked between the upper pedestal and the lower pedestal, a fixed contact configured corresponding to the moving contact assembly is mounted at the inner side of the insulator, the difference lies in the fact that an outer insulating cylinder is mounted on the periphery of the insulator, theouter insulating cylinder is provided with spaced connecting terminals, an inner end of the connecting terminal is linked with a leading-out terminal on the insulator via a linkage conductor, the leading-out terminal is connected with the fixed contact, and two adjacent connecting terminals are distributed in an axially and vertically staggered manner. The invention dramatically ameliorates electric field distribution of the switch at the same time of unloading, and the adjacent connecting terminals are distributed on the outer insulating cylinder in an axially and vertically staggered manner,thus further improving insulating level of the adjacent terminals; the invention is simple and compact in structure as well convenient for manufacturing and installation, The invention is suitable for tapping switches of high voltage and large current in particular.

The invention relates to a high voltage alternate current isolating switch and earthing switch combination which is characterized in that an isolating switch is connected with a ball screw by a control mechanism through an insulating pull rod; a center shaft of the ball screw rotates together with the insulating pull rod; a shaft sleeve on the ball screw pushes an isolating switch moving contact fixed on the shaft sleeve of the ball screw to move along the axial direction; an earthing switch drives an earthing switch moving contact by the control mechanism to realize switching-off or switching-on; a main conductive loop when the isolating switch is positioned at the switching-on position is formed by the isolating switch moving contact and an isolating switch fixed contact; and sulfur hexafluoride gas is used as an insulating medium and an arc extinguishing medium. A rated current of the high voltage alternate current isolating switch and earthing switch combination can reach 10,000A. Moreover, the high voltage alternate current isolating switch and earthing switch combination has compact structure and high insulating level and can be applied to a gas-insulated metal-enclosed switchgear (Gas Insulated Switchgear GIS) at the voltage level of 126kV to 1,200kV.

The invention provides a three-phase voltage transformer based on a D_dot principle and a three-phase influence voltage compensating method. The three-phase voltage transformer comprises an annular electrode I, an annular electrode II, an insulating support and a grounding capacitor. The insulating support comprises a semicircular support body I, a semicircular support body II and a supporting arm. The supporting arm is arranged on the side wall of the semicircular support body I and the side wall of the semicircular support body II, and the semicircular support body I and the semicircular support body II are concentrically arranged to form a through hole used for allowing a measured conductor to penetrate through. The annular electrode I and the annular electrode II are concentrically arranged and are embedded into the semicircular support body I and the semicircular support body II respectively. The annular electrode I and the annular electrode II are in series connection with the grounding capacitor and the ground through wires. The three-phase voltage transformer has the advantages of being small in size, simple in structure, good in insulating property, safe to measure and the like. The three-phase influence voltage compensating method analyzes the mutual influence among three phase lines in the measuring process, so that a measured value close to the real situation is obtained.

The invention belongs to the field of high-voltage SF6 circuit breakers, in particular to a gas rotation energy separation type high-voltage SF6 circuit breaker and an energy separation method thereof. The circuit breaker comprises a piston (1), an air cylinder (2), a movable main contact (3), a movable arcing contact (4), a static arcing contact (5), a static main contact (6) and a nozzle (7), wherein a vortex diversion mechanism (8) is fixedly arranged near the end part of the movable arcing contact (4) on the upstream of the nozzle (7), consists of a group of flow deflector units (9) with intersected structures and can consist of a fan blade type flow deflector (16) or a screw type flow deflector (21). By the circuit breaker and the method, SF6 gas which flows out of the air cylinder is subjected to vortex motion, temperature gradient variation along the radial direction is formed in the motion process, and arc energy is quickly dissipated; and the circuit breaker has a high arc temperature reduction speed, a high insulating property, high breaking capacity and high operation reliability and is convenient to mount and maintain.

The invention provides a high voltage capacitor with a plug-in bipolar line outgoing structure, achieves rapid replacement of a capacitor in a closed insulation condition, and is characterized by electrode integration and simple usage. The high voltage capacitor comprises an inner cone socket, one line outgoing sleeve, an independently-arranged capacitor body and a sealed metal shell. The capacitor body is internally provided with a capacitor core. A socket inner electrode and a socket outer electrode are arranged in the inner cone socket in a penetrating manner, and one end of the inner cone socket is embedded in the metal shell in a sealing manner. One end of the line outgoing sleeve is fixed on the capacitor body in a sealing manner. A sleeve inner electrode and a sleeve outer electrode are arranged in the line outgoing sleeve in a penetrating manner, and the sleeve inner electrode and the sleeve outer electrode are electrically connected with two sides of the capacitor core respectively. The other end of the inner cone socket and the other end of the line outgoing sleeve are cooperated with each other in a plug-in manner through a groove and a projection in corresponding arrangement. The socket inner electrode is electrically connected with the sleeve inner electrode. The socket outer electrode is electrically connected with the sleeve outer electrode.

The invention discloses an insulation tower head used for a distribution network overhead line, relating to the field of distribution network overhead line lightning overvoltage protection; wherein, the insulation tower head comprises an insulation pillar which is used for single-circuit or same-rod multi-circuit line. The insulation tower head also comprises a cross arm insulator or a cross arm and a pin-typed/pillar insulator; wherein, an overhead lead is fixed at one end of the cross arm insulator or on the pin-typed/pillar insulator at the end of the cross arm; the other end of the downmost cross arm or the middle part of the cross arm is fixed at the upper end of the insulation pillar; the lower end of the insulation pillar is fixed on the top of a power pole. According to the practical requirement of the system, the insulation pillar, the composite/ceramic cross arm insulator, the insulation/metal cross arm and the pin-typed/pillar insulator can be combined for usage to form the insulation tower head with a plurality of structure types, thus greatly improving the insulation level of the line and effectively preventing the accidents of line trip, insulator damage and insulation lead breakdown, etc. which are caused by lightning induction overvoltage of overhead line.

The invention discloses a leakage monitoring and protection device for a generator casing, and a using method thereof, comprising a leakage detecting device, an insulation resistance measuring mechanism, an insulation resistance comparing mechanism, a control mechanism, an alarm device, and a moisture removing mechanism, wherein the leakage detecting device is connected with the generator casing,the insulation resistance measuring mechanism is connected with the insulation resistance comparing mechanism, the insulation resistance measuring mechanism measures the insulation resistance values between each of the generator windings and the generator casing, and the control mechanism is respectively connected with the leakage detecting device, the insulation resistance detecting mechanism, the insulation resistance comparing mechanism, the alarm mechanism, and the moisture removing mechanism. The invention is capable of detecting the leakage condition of the generator casing in real time,automatically activating the dehumidification mechanism to dehumidify when the leakage occurs, and using the short-circuit current generated in the excitation magnetic field and the stator winding ofthe generator to generate heat and dry, thereby improving the insulation resistance values between each of the windings of the generator and the generator casings, and well ensuring the insulation safety of the generator casing.

Inductors L1, L2 are respectively inserted in series at the positive and negative sides of lines for guiding a direct current supplied from an alternating current power supply 1 through a rectification circuit 2, or a direct current supplied directly from a direct current power supply, a switching element S is connected in parallel to the inductors L1, L2, and capacitors C1, C2 are respectively inserted in series between the positive-side inductor L1 and a load, and between the negative-side inductor L2 and the load. Even no transformer is used, not only insulation for a direct current but also insulation for an alternating current can sufficiently be ensured (FIG. 1).

The invention discloses a composite material tower, which comprises a body, a first outer layer, a second outer layer and a foam filter placed in the body, wherein the first outer layer and the second outer layer are positioned outside the body; the body is made of a composite material of a resin and insulating fibers; the first outer layer is made of a composite material of weatherproof resin and insulating fibers; the second outer layer is made of inorganic paint; and the body, the first outer layer, the second outer layer and the foam filter in the body form the composite material tower. The composite material tower provided by the invention is very suitable for long-term operated under various outdoor severe weather conditions as the adopted cycloaliphatic epoxy resin and inorganic paint have excellent uvioresistant, waterproof, dampproof, non-adhesive, self-cleaning and electrical insulating properties.

The invention provides an earthing switch device which can be switched between a separating brake state and an on-position state. The earthing switch device comprises an underframe (1), at least one pair of fixed contacts (2), at least one pair of movable contacts (3), a main shaft (4), a connecting lever part (7) and a shield part (6), and the main shaft (4) is arranged on the underframe (1) in a rotating mode. The connecting lever part (7) is used for fixed installation of the movable contacts (3) on the main shaft (4). The shape and/or arrangement of the shield part (6) allows the earthing switch device to shield the connecting lever part (7) under the separating brake state, opposite to the static contacts (2). The earthing switch device can at least eliminate top electric field between the fixed contacts (2) and the connecting lever part (7), and improves evenness of electric field of the earthing switch device.

The invention provides an ultra-high voltage outdoor bar-shaped porcelain support insulator, aiming to solve the technical problem that the 500 kv and 750 kv voltage-class bar-shaped porcelain support insulator is not applicable to a 1000 kv alternating-current ultra-high voltage power grid. The invention is characterized in that the support insulator is composed of five equal- height porcelain elements, the height of each porcelain element is 2 m, the diameter of the main body of the last porcelain element is 310-330 mm, and the outer diameter of the upper equalizing ring is 2000-2800 mm. The invention is applicable to 1000 kv alternating-current ultra-high voltage power transmission engineering.

The invention discloses a dry-type bushing insulator vacuum gas filling casting system, which includes an epoxy resin casting mold, a material injection tank, a gas storage pressure tank, a gas compressor, a vacuum pump, an insulating gas storage and inflation device, and a gas recovery device; The injection tank is connected with the epoxy resin casting mold through the injection pipe, and the gas storage pressure tank is located between the injection tank and the gas compressor, which is connected with the pipeline between the injection tank and the gas compressor; the vacuum pump and The insulating gas storage and inflation device is respectively connected to the epoxy resin casting mold through the vacuum pumping pipeline and the gas filling pipeline, and the gas recovery device is connected in parallel to the gas filling pipeline through the gas recovery pipeline. This dry-type bushing insulator vacuum gas filling system adopts the method of vacuuming the special mold and filling the insulating gas to realize the automatic pressure coagulation of the epoxy resin, which improves the insulation level of the product and reduces the possibility of partial discharge. Advanced production means, less manual intervention, and high product yield.

The invention provides a high-pressure pneumatic isolating switch and relates to the field of electric equipment. The high-pressure pneumatic isolating switch comprises a multi-level cylinder, a moving contact and a grading shield, wherein a middle flange is arranged on the cylinder; a limiting section is respectively arranged on each section of cylinder; the middle flange is limited and fixed by one limiting section; a hook piece is arranged at a connecting end of the cylinder barrel; a cover-shaped connector is connected with a piston rod end of the cylinder; an opening of the cover-shaped connector is faced to the cylinder; the moving contact is fixed on the cover-shaped connector; at least two hard wires are arranged between the cover-shaped connector and the middle flange; the two ends of the hard wires are respectively fixed with the middle flange and the cover-shaped connector; the grading shield is buckled on the moving contact; an opening through which the moving contact can enter or exit is formed on the middle part of the grading shield. The high-pressure pneumatic isolating switch is simple to use and occupies small area; the grading shield of the high-pressure pneumatic isolating switch is softly connected in or under the cover and is important to the uniform distribution of electric field; the high-pressure pneumatic isolating switch can obviously increase the insulation level of the isolating switch; the switch has the advantage of strong arc resistance.

Aiming at resolve the defects that assemblage and maintenance are not convenient of traditional isolating switch device, the invention provides an isolating switch device that the operation is simple, insulation is strong, performance is more reliable, it includes shell, operating mechanism, a isolating switch and at least one grounding switch, the isolating switch includes act end screening can and spacing movable contact, static end screening can and spacing stationary contact; the grounding switch includes grounding act contact which is on lower side wall of the shell and grounding static contact which is on lower side of the act end screening can or static end screening can. It characterized in that the spacing movable contact and spacing stationary contact are arranged in level linear type, the action direction is uniform with the axial center of shell, the act end screening can and static end screening can are separately fixed to two ends of the shell via insulated basin, the operating mechanism adopts two separated drive and connection mechanism of separating and grounding to realize the non-interference of separating switch and grounding switch.