726 results about "Solid insulation" patented technology

The magnetic circuit of a generator in a wind power plant is arranged to directly supply a high supply voltage of 2-50 kV, preferably higher than 10 kV. The generator is provided with solid insulation and its winding includes a cable (6) comprising one or more current-carrying conductors (31) with a number of strands (36) surrounded by at least one outer and one inner semiconducting layer (34, 32) and intermediate insulating layers (33). The outer semiconducting layer (34) is at earth potential. The stator winding may be produced with full or fractional slot winding, the phases of the winding being Y-connected. The Y-point may be insulated and protected from over-voltage by means of surge arrestors, or else the Y-point may be earthed via a suppression filter. The invention also relates to a wind power plant, a generator included in the plant and a variable speed system for such a plant.

A wind-power unit has a wind turbine has an electric generator connected to the wind turbine. The stator of the generator has a winding formed of a high-voltage cable having a core of conducting material, a first layer of semiconducting material surrounding the core, an insulating layer of solid material surrounding the first layer, and a second layer of semiconducting material surrounding th solid insulation. The wind turbine has a plurality of turbine blades running vertically and being connected to a turbine shaft. The generator is arranged at the lower end of the turbine shaft. A wind-power plant; the use of a wind-power unit; and a method of generating electric power are described.

Disclosed is an apparatus used for measuring medium insulating property in the gas-liquid phase flow state, a heating device (20) is positioned at the bottom part of an airtight container (10), and a condensing device (90) is positioned at the upper part of the airtight container (10). The condensing device (90) is provided with a water inlet (100) and a water outlet (110) penetrating through the top plate of the airtight container (10). A high voltage electrode (50) and a low voltage electrode (60) are positioned at the middle part of the airtight container (10), and penetrate into the airtight container (10) from two relative directions; and a liquid medium (40) under test is added into the airtight container (10), the heating device (20) heats the liquid medium (40) to boil in the two-phase flow state, the steam generated by the liquid medium (40) after boiling evaporation is cooled by the condensing device (90) to turn into liquid and flow back to the bottom part of the airtight container (10). The apparatus can be used for measuring insulating properties of various liquid media and solid insulation materials in the liquid medium environment under the gas-liquid phase flow state.

The invention relates to an electrode plate and a lithium ion battery comprising the same. The electrode plate comprises a current collector, an electrode diaphragm and an insulation layer; the electrode diaphragm comprises an electrode active substance; the insulation layer comprises solid insulation padding with the mohs hardness being less than or equal to 5; the insulation layer at least covers an area, which is not covered by the electrode diaphragm, of the surface of the current collector. By adopting the insulation layer, the safety problem caused by the piercing of burrs of the current collector to the diaphragm can be avoided; the insulation layer also has the good extension rate and the good effect on transferring the rolling pressure, the flat appearance of the electrode plate in rolling can be guaranteed, a good fitting interface of the electrode plate inside a cell also can be guaranteed, and the capacity loss of the lithium battery in the charging and discharging processes can be reduced.

The invention discloses an oiled paper compound insulation electrical ageing test system which comprises an alternating current-direct current high voltage power supply, a high voltage capacitance-resistance divider, an oiled paper insulation sample tank, a partial discharge measuring instrument and an upper computer. The alternating current-direct current high voltage power supply is connected with the oiled paper insulation sample tank. The high voltage capacitance-resistance divider is connected with the oiled paper insulation sample tank. The partial discharge measuring instrument is connected with the oiled paper insulation sample tank, and collects partial discharge signals inside an oiled paper insulation sample. The upper computer is in two-way communication connection with the alternating current-direct current high voltage power supply and the partial discharge measuring instrument. According to the oiled paper compound insulation electrical ageing test system, alternating current-direct current compound voltage is adopted for oiled paper insulation, accurate and accelerated ageing is conducted on a solid insulation paper board, and an oiled paper insulation electrical ageing laboratory test is achieved.

A power supply includes a casing, an electronic module and a filler having a solid insulating substance, and the casing has a cavity for installing the electronic module, and a filling space reserved from an internal wall of the casing, and the filler having the solid insulating substance is filled into the filling space, such that the consumption of potting can be reduced to lower the cost of the potting and meet the application requirements of the power supply.

The invention discloses a solid insulated totally-enclosed ring main unit, which comprises at least a line of leading-in unit and at least a line of leading-out unit, and each line of switch comprises a 3-phase high-voltage vacuum switch unit. The high-voltage vacuum switch consists of a housing fixed inside a box body, and a main switch and an isolator arranged in the housing, wherein, the housing is made of epoxy resin, and a copper joint pin of the main switch and the outside of a busbar connected with the copper joint pin are coated with silicon rubber layers. The ring main unit of the invention adopts a totally enclosed design, which causes the ring main unit to have a smaller volume and compact structure, and to be safe and reliable; the probability of leakage and discharge is low, thus improving the insulation class, and the ring main unit has obvious effect on saving energy and materials; air, moisture, dust and hot and cool air sources are isolated, which effectively retards the corrosion of a power source body, stabilizes the output of source voltage, decreases the times of the device maintenance, reduces expense cost and prolongs the service life of the ring main unit.

Disclosed herein is a method that relates to determining water content of a solid insulation at a specific location within a transformer. The method comprising, determining a temperature of the solid insulation at a specific location, calculating a relative moisture saturation of the oil at the specific location, calculating the ultimate water content in the solid insulation at the specific location, and calculating an actual water content in the solid insulation at the specific location.

A high-voltage combined electrical apparatus is disclosed, which overcomes the following problems that: in the existing high-voltage combined electrical apparatus, an insulating sleeve has the dangers of leakage and explosion; the on/off induced current and the on/off bus transfer current of a three-position switch and a quick grounding switch are very difficult, so that the SF6 gas excellent in insulation property must be used; and a high-voltage circuit breaker is high in stress as being arranged in a high-pressure force gas. The high-voltage combined electrical apparatus has the following characteristic and advantages that: (1) all dry air or nitrogen is used as the insulating gas, so that the electric apparatus can be used under the condition of low temperatures; (2) a solid insulating sleeve is employed without the dangers of leakage and explosion; (3) the three-position switch and a high-voltage vacuum circuit breaker are designed to have a cordwood structure, so that the switch and the breaker can be plugged in flexible and a plurality of structure proposals are realized; and (4) the three-position switch and the quick grounding switch are characterized in that an opening spring is used as the power for quickly opening the isolating switch and the quick grounding switch, thereby achieving the purposes of the on/off induced current of the three-position switch and the on/off bus transfer current of the quick grounding switch.

The invention discloses an oil-immersed type transformer solid insulation moisture content assessment method based on return voltage, comprising the following steps: 1) preparation work: the temperature of a transformer is lowered without forced oil circulation; an outgoing line terminal and a line of each winding sleeve are separated; and each phase of a high voltage winding and neutral points are in short circuit and grounded; 2) wire connection: each measured winding is in grounded insulation; 3) parameter configuration; 4) test end judgment: a polarized spectrum curve raises smoothly and then declines, when the peak value of the polarized spectrum curve appears, test is ended; when the tested polarized spectrum curve has serious jump or a plurality of peak values, the test is ended when the charging time Tc equals to 100s; 5) moisture content is judged according to a main time constant of the polarized spectrum curve; and 6) when the moisture content is less than 1%, the insulation state is good; when the moisture content ranges from 1% to 2.5%, the insulation state is general; and when the moisture content is higher than 2.5%, the insulation state is very poor. The invention can accurately assess brackish moisture content in insulation paper and judge the insulation and aging state of oil paper without suspended core and sampling and destroying the insulation material.

The invention discloses an isolated insulation cover and an isolating switch device, belonging to the field of conductive connection devices. The isolating switch device is composed of an isolated insulation cover and an insulation switch unit, wherein the insulation cover comprises a cover body which is made of a solid insulation material and has an open back face; an upper plate of the cover body is provided with a first step hole; a first insulation cover is installed in an upper section hole of the first step hole; the first insulation cover is provided with a second step hole; a lower plate of the cover body is provided with a first through hole; a second insulation cover is installed on the first through hole; a third step hole is formed at the center of the second insulation cover; a bump is arranged at the middle part of the front surface of a front plate of the cover body; the bump is provided with a casing connection hole communicated to the inner cavity of the cover body; the left and the right sidewalls of the inner cavity of the cover body are symmetrically provided with a pair of ribs; and a three-position isolating switch unit is installed in the isolated insulation cover. The isolated insulation cover and the isolating switch device disclosed by the invention have the advantages of small size, convenience for installing in on-site construction, reduced size for the box body of the power distribution unit, and saved cost; and the isolating switch device can achieve the functions of three stations consisting of switch-on operation, isolating and earthing.

The invention belongs to the field of high-voltage DC solid insulation material surface charge accumulation and surface flashover measurement, and particularly relates to a DC GIL disc insulator surface charge density measurement and observation platform, which is characterized in that two insulators separate a sealed metal cavity into three cavity rooms; the cavity room at the left side is connected with an external casing via a flange; a charge measurement device inside the cavity room above the right side is located above a coaxial cylindrical structure test device, a turning mechanism is fixed on the wall of the metal cavity, the coaxial cylindrical structure test device is connected with the turning mechanism via the support, a quartz window is arranged at the top of the cavity room, and a high-speed camera support and a high-speed camera are arranged outside the cover plate of the top flange; and each of the three cavity rooms is respectively provided with a valve with a barometer. The design is easy to realize, the operation is simple, and a reliable and effective test platform is provided for doing research on correlated characteristics between the disc insulator surface charge accumulation and surface flashover in the DC GIL.

A multiphase superconducting cable connection structure includes a connection box accommodating three conductor connects connecting a superconductor of a cable core of each phase extracted from a pair of 3-phase superconducting cables, a solid insulation member fixed to an outer circumference of each conductor connect, and a metal flange fixing the solid insulation member to the connection box. By fixing the metal flange to the connection box (a refrigerant vessel), the conductor connect can be positioned and the conductor connector's movement caused as the cable core thermally contracts can be reduced. The structure can help to position the conductor connect in the connection box and reliably hold it at a prescribed position.

The invention discloses a solid insulating bus connector which comprises a T-shaped insulating sleeve, an insulating rubber sheath, a conducting rod and a plug, wherein an electrified conductor is embedded in the T-shaped insulating sleeve. By arranging a through hole on one end of the electrified conductor in the T-shaped insulating sleeve, arranging a spring contact finger in the through hole of the electrified conductor and using the flexibility of the insulating rubber sheath, cabinet bodies can be firstly spliced, and then, buses can be connected. The dimensional accuracy and installation requirements for gas switch cabinets are reduced, installation deviation occurring in cabinet splicing can be effectively and adaptively compensated and adjusted, cabinet splicing is simple, buses are connected conveniently and reliably, and the insulating performance is good.

The invention relates to novel transformer anti-aging mixed insulating oil and a preparation method thereof. The novel transformer anti-aging mixed insulating oil mainly comprises the following raw materials in percentage by weight: 15% of rapeseed oil and 85% of mineral insulating oil. The novel mixed insulating oil disclosed by the invention meets the requirement of GB 2536-2011 in various physicochemical and electric indexes and can be directly added in the traditional mineral oil transformer. Compared with the mineral insulating oil, the novel mixed insulating oil disclosed by the invention can be used for obviously delaying the ageing speed of the solid insulation of a transformer and prolonging the service life of the transformer; compared with plant insulating oil, the novel mixed insulating oil disclosed by the invention can be used for obviously enhancing the radiating property of the transformer, and preventing the traditional transformer radiating system from being rebuilt; and compared with already developed olive oil-mineral oil type mixed oil, the novel mixed insulating oil disclosed by the invention can be used for obviously reducing the development cost of insulating oil and is favorable to large-area popularization.

The invention relates to a real-time microscopic observation test system for electrical tree characteristics in solid insulation under DC voltage, which comprises an open container, a supporting base is placed in the open container, a tested sample is placed on the supporting base, a pin electrode of the sample is connected with a high-voltage lead through a high-voltage copper cylinder, a plate electrode of the sample is connected with a low-voltage lead through a low-voltage copper rod, the low-voltage copper rod, a spring and the high-voltage copper cylinder are matched in design so as to be conducive to placement and position fixing of the sample, the open container is covered by a container cover, sloshing of silicon oil in an area above the sample can be effectively weakened through a microscopic observation column inserted at a hole in the container cover, and a direct observation window on the container cover is used for carrying out position observation and adjustment on the microscopic observation column. The real-time microscopic observation test system can fix the position of the tested sample effectively, is convenient for placing and taking the sample, can be applied to solid insulation electrical tree test samples with different shapes and sizes, can carry out real-time observation and photographic recording on a pinpoint area of the sample while applying the DC voltage, and does not need to cut off the power.

The present invention provides an epoxy pouring solid insulation switch with double-isolation which comprises three same switch bodies arranged in a housing, the switch body comprises a vacuum explosion chamber and two same upper and lower isolation switches; the upper isolation switch, the vacuum explosion-chamber cabin and the down isolation switch are fixedly connected each other, the upper isolation switch locates above the vacuum explosion chamber cabin, the lower isolation switch locates below the vacuum explosion chamber cabin, the lower isolation switch has a same horizontal installingdirection and an opposite vertical installing direction with the upper isolation switch. The switch provided by the invention has advantages of reasonable design, higher electric safety performance,little volume, light weight, stable performance, reliable motion, stronger practicability and advancement. The switch provides assurance for reliability of electric supply, which is a precondition condition for reducing user investment.

The invention discloses a partial discharge signal comprehensive entropy value-based electrical equipment dangerous discharge discrimination method, which relates to a discharge discrimination method.Multiple dangerous signals are hidden in a data sequence and can not be found, and thus, equipment failure is caused, and the failure can not be warned in advance. The method comprises steps: 1) a discharge state feature library of insulation defects under long-term voltage is built, wherein the library building comprises the following sub steps of building of a test system, building of a transformer defect test model, boosting test and data analysis; 2) neural network learning for solid insulation surface defect discharge signal data in a sample library is carried out; 3) the neural networkis used to carry out real-time monitoring on the data; and 4) according to the detection result, diagnosis and early warning are carried out on solid insulation surface defect discharge failure of high voltage power equipment. Effective evaluation and early warning on the risks of breakdown or flashover failure caused by insulation defect discharge under field engineering conditions can be realized.

The invention relates to a method for slowing down the aging of solid insulation of an oil-paper insulating transformer, which is used for slowing down the aging of solid insulation of the transformer and belongs to the technical field of insulation of power transformer. The method comprises the following steps of: (1) setting a control target value T + delta T of a constant value of winding hot spot temperature of the transformer; (2) measuring the winding hot spot temperature in the transformer operation; (3) according to the winding hot spot temperature of the transformer obtained through measurement, calculating the changing rate D/Dt of the winding hot spot temperature; and (4) comparing the winding hot spot temperature of the transformer obtained through measurement with the preset control target value T + delta T of the constant value of the winding hot spot temperature of the transformer, combining with the changing rate D/Dt of the winding hot spot temperature of the transformer obtained through calculation, and determining a cooling control system to input or output a cooling fan. The method controls a heat-removal system of the transformer and pursues the approximate constancy of the winding hot spot temperature of the transformer to reduce the relative motion of moisture between the oil-paper insulation of the transformer, so that the aging speed of the solid insulation of the transformer can be effectively slowed down.

The invention relates to a fatigue test device and method for a solid insulation degradation process. The fatigue test device comprises a glass cabinet, a platform assembly arranged in the glass cabinet and used for placement of a tested object, a high voltage system and a low voltage system. The glass cabinet is filled with insulating oil. The glass cabinet is supported against the ground through insulating supporting columns. Part of the high voltage system is arranged in the glass cabinet, and the other part of the high voltage system is arranged outside the glass cabinet. Part of the low voltage system is arranged in the glass cabinet, and the other part of the low voltage system is arranged outside the glass cabinet. An index model used for evaluating the insulating fatigue state is set up through the influences of the test waveform, the frequency and the temperature on electric treeing; a model for describing an insulating fatigue service life curve is set up; a model for conducting service life evaluation on the insulating state by means of the fatigue service life curve and running test data is set up. According to the fatigue test device and method, the insulating aging development process can be accurately described and predicted, and therefore the insulating state can be accurately judged, the state maintenance work efficiency of electrical devices can be improved, and cost is reduced.