4349 results about "Transformer oil" patented technology

The invention belongs to the technical field of transformer ageing detection. An experimental device for transformer oilpaper insulating thermal ageing consists of an outer cavity, an inner cavity and a measurement-display system, wherein the inner cavity consist of a main cavity body, an oil conservator on the main cavity body, an electrode-sample test frame inside the main cavity body and a minor cavity body; the minor cavity body and the main cavity body are connected through a pipeline; a valve is arranged on the pipeline; and an air exhaust port and an oil injection port are arranged on the main cavity body. An experimental method for transformer oilpaper insulating thermal ageing comprises the following steps: 1) performing insulating-paperboard vacuum dry sample treatment; 2) placing sample and injecting oil; 3) installing the minor cavity body; 4) injecting transformer oil; 5) accelerating thermal ageing experiment; 6) measuring dielectric parameters on line to acquire related experiment data; and 7) analyzing off-line sample physicochemical parameters to acquire experiment data. The invention can measure the dielectric parameters of the samples on line in real time, regularly samples on the premise of not changing the prior test environment of the samples, and can research thermal ageing laws of oilpaper insulating materials of large-scale power transformers.

The invention discloses a method for vibration online monitoring and fault diagnosis of a power transformer. The surface vibration of an oil tank of a transformer, the voltage, the current and the oil temperature of the transformer, and the switching values reflecting the on-states of a vibration source fan and the oil tank of the transformer are taken as basic monitoring parameters to be monitored; after signal conditioning is performed on the monitoring parameters, continuous synchronous waveform data sampling, processing and saving are performed; then the processed waveform data are continuously displayed in real time; signal decomposition, multi-parameter correlation analysis and characteristic vector magnitude extraction are performed on the waveform data; and then various characteristic vector thresholds of a specific transformer are compared to analyze and diagnose the operating state and the fault of the transformer. With the method, the operating state of the power transformer can be monitored in real time, and early warning as well as the analysis and the diagnosis of the fault condition of the transformer are provided, thus guaranteeing the secure and stable operation of the transformer.

The invention provides a testing device and a testing method of electricity-heat-mechanical stress three-factor combined ageing for transformer paper oil insulation ageing study; the testing device comprises an electric heating ageing oven, in which a transformer paper oil insulation simulator, a shake unit and a temperature control device used for controlling the temperature of the electric heating ageing oven. The shake unit can drive the simulator to vibrate, the simulator is electrically connected with a high-voltage power supply; the testing method includes vacuum drying and oil impregnation of insulating paper, attaching the paper to the earth electrode in a stainless steel case of the testing device, winding coils as a high voltage electrode outside the insulating paper and the earth electrode and injecting insulating oil to the stainless steel case; connecting a high tension lead with the high-voltage power supply and starting the shake unit; sampling the insulating paper and the insulating oil alternately and measuring insulation ageing parameters.

The invention provides a transformer paper oil insulation experiment device integrated with electric heating combination ageing and partial discharge, and provides a corresponding experiment method. The experiment device comprises a high voltage portion, a low voltage portion and a sealing tank portion. The device can provide a platform of electric heating combination ageing and partial discharge experiments for a transformer paper oil insulation defect model, and can provide experiments of corona discharge, creeping discharge and air-gap discharge models in oil. The device has good air-tight performance, and can be isolated from external air and other influences. The whole system self cannot produce partial discharge, and the device cannot produce rust and other impurities in the partial discharge, can guarantee reliability of the partial discharge, and is simple in structure, convenient to operate, and capable of achieving good test effects.

A method is provided for carbonizing and activating carbonaceous material, which comprises supplying the material to an externally fired rotary kiln maintained at carbonizing and activating temperatures, the kiln having a downward slope to progress the material as it rotates, the kiln having an atmosphere substantially free of oxygen provided by a counter-current of steam or carbon dioxide, and annular weirs being provided at intervals along the kiln to control progress of the material. There may further be provided an externally fired rotary kiln for carbonizing and activating carbonaceous material having a hollow rotary body that has a downward slope towards a discharge end thereof, and which is provided at intervals along its length with annular weirs for controlling progress of the carbonaceous material. In embodiments, there is also provided a process is for producing discrete solid beads of polymeric material e.g. phenolic resin beads having a mesoporous structure, which may be useful as feedstock for the above mentioned carbonization/activation process or which may have other utility e.g. as ion exchange resins. The process may produce resin beads on an industrial scale without aggregates of resin building up speedily and interrupting production. The process comprises the steps of: (a) combining a stream of a polymerizable liquid precursor e.g. a novolac and hexamine as cross-linking agent dissolved in a first polar organic liquid e.g. ethylene glycol with a stream of a liquid suspension medium which is a second non-polar organic liquid with which the liquid precursor is substantially or completely immiscible e.g. transformer oil containing a drying oil; (b) mixing the combined stream to disperse the polymerizable liquid precursor as droplets in the suspension medium e.g. using an in-line static mixer; (c) allowing the droplets to polymerise in a laminar flow of the suspension medium so as to form discrete solid beads that cannot agglomerate; and (d) recovering the beads from the suspension medium. There is also provided apparatus for forming discrete solid beads of polymeric material, said apparatus comprising: a first line for conveying s stream of a polymerizable liquid precursor; a second line for conveying a stream of a dispersion medium with which the polymerizable liquid precursor is substantially or completely immiscible; an in-line mixer configured to receive a combined flow from the first and second lines and to disperse the polymerizable liquid precursor as droplets in the dispersion medium; a vertical polymerization column configured to receive the dispersion medium with the droplets dispersed therein and to permit the polymerizable liquid precursor polymerize while descending the column in a descending flow of polymerization medium; and a vessel at the base of the column for receiving the descending flow of dispersion medium and collecting polymerized solid beads.

The invention aims at providing a low-temperature resistant rubber which can be used for a long time in low temperature and has almost the same tensile strength and elongation at break and the same hardness at low temperature as at normal temperature. The low-temperature resistant rubber contains main body rubber, strengthening agent, plasticization softener and curing ingredient, and the weight ratio of main body rubber : strengthening agent : plastifying softener : curing ingredient is 100:10-350:5-75:0.5-3; the main body rubber is natural gum, styrene-butadiene-rubber, cis-butadiene rubber, butyl rubber, ethylene propylene diene rubber, butadiene nitrile rubber or the combination of natural gum and cis-butadiene rubber; the strengthening agent is black carbon or white carbon; the plastifying softener is machine oil, transformer oil, dibutyl sebacate, dibutyl phthalate or silicon oil; the curing ingredient is 2,5-dimethyl curing ingredient or sulphur.

The invention relates to a transformer oil-paper insulation electricity-heating unite ageing test device which comprises a sealing cavity and a test device body located in the sealing cavity. The test device body of the transformer oil-paper insulation electricity-heating unite ageing test device comprises a high voltage electrode, a low voltage electrode and an insulation paper sample, the insulation paper sample of the test device body is located between the high voltage electrode and the low voltage electrode, and electric ageing conditions of an oil-paper insulation test are controlled by controlling the voltage exerted to the insulation paper sample; the transformer oil-paper insulation electricity-heating unite ageing test device further comprises a heating device, and heat aging conditions of the oil-paper insulation test are controlled by controlling the heating temperature of the heating device; the transformer oil-paper insulation electricity-heating unite ageing test device further comprises a partial discharge detecting device, and high-frequency partial discharge detecting and low-frequency partial discharge detecting are achieved. By means of the transformer oil-paper insulation electricity-heating unite ageing test device, multi-state detection and fault diagnosis of a transformer can be achieved, an oil sample and gas in the sealing cavity after the aging test are directly taken out under the condition that the sealing cavity is not opened, the reliability of experimental analysis results is high, and the device is easy and convenient to operate, and the problem that an existing test device is low in reliability of the experimental analysis results and inconvenient to operate is solved.

An oil-filled transformer monitoring system is provided which calculates an oil temperature of an oil-filled transformer with high precision from a current of the transformer and an ambient temperature. The oil-filled transformer monitoring system of this invention has an oil temperature calculation device to calculate a transformer oil temperature using measurements from a transformer current measuring device and an ambient temperature measuring device. The transformer monitoring system also has an oil temperature measuring device and compares an output value from the oil temperature calculation device with an output value from the oil temperature measuring device to detect any anomaly.

The present invention provides a reliable modular production quality excimer laser capable of producing 10 mJ laser pulses in the range of 1000 Hz to 2000 Hz or greater. Replaceable modules include a laser chamber; a pulse power system comprised of three modules; an optical resonator comprised of a line narrowing module and an output coupler module; a wavemeter module, an electrical control module, a cooling water module and a gas control module. Important improvements have been provided in the pulse power unit to produce faster rise time and improved pulse energy control. These improvements include an increased capacity high voltage power supply with a voltage bleed-down circuit for precise voltage trimming, an improved communication module that generates a high voltage pulse from the capacitors charged by the high voltage power supply and amplifies the pulse voltage 23 times with a very fast voltage transformer having a secondary winding consisting of a single four-segment stainless steel rod. A novel design for the compression head saturable inductor greatly reduces the quantity of transformer oil required and virtually eliminates the possibility of oil leakage which in the past has posed a hazard.

The invention discloses a partial discharge simulation experiment device of suspended metal particles in oil of a transformer, which belongs to the technical field of partial discharge online monitoring of oil immersed transformers. The partial discharge simulation experiment device mainly comprises an induction regulator, a non-corona test transformer, a non-partial discharge protective resistor, a standard capacity voltage divider, a partial discharge generation device, a noninductive detection resistor, an ultrahigh frequency antenna, a coaxial cable, a broadband high-speed large-capacity digital storage oscillometer and the like. The partial discharge simulation experiment device can simulate stable partial discharge signals generated by the suspended metal particles in flowing oil with different oil flowing speeds at different temperatures when the oil immersed transformer is in a working stage. Therefore, the partial discharge simulation experiment device can be widely applied to the simulation of partial discharge generated by the defect of the suspended metal particles in the oil immersed transformer in a laboratory and can provide reliable experimental data for teaching, scientific research institutions and schools and transformer manufacturers to monitor oil immersed transformers on line and analyze and apply partial discharge signals.

The invention a high oil-absorbing resin, which is prepared from monomer, cross-linking agent, pore forming agent, initiator and dispersant at a ratio of 100:(1.2-2.8):(10-50):(0.2-2):(0.1-0.5) by initiating suspension polymerization in a nitrogen gas protective atmosphere via free-radical. The high oil-absorbing resin is adopted as an adsorbent in abandoned oil recovery treatment, for example, the high oil-absorbing resin which accounts for 2.5wt%-10wt% of the oil amount of a waste transformer is added to an oil water mixture of the waste transformer, and the waste transformer oil in waste water can be absorbed by resin and condensed into gel blocks, so as to separate from the water. The gel blocks containing the waste transformer oil is removed by filtering with a filter screen. The tank water can be discharged in a pollution-free manner. The oil product is recovered from the gel blocks containing the oil by distillation. The resin can be utilized repeatedly. The abandoned oil recovery treatment method adopting the high oil-absorbing resin has the advantages of simple process and low processing cost, and conforms to the environmental requirements.

The invention provides environment-friendly insulating oil which takes vegetable oil as the raw material, and has high flash point and anti-oxidation stability, consists essentially of triglyceride and antioxidant, and also contains a metal deactivator in the further technical proposal. The environment-friendly insulating oil is prepared by refinement by taking vegetable oil as the raw material, does not contain toxic substances, dose not cause damage to environment and human body, and can be rapidly and thoroughly biodegraded, is environment-friendly insulating liquid, and can be applied in places with requirement of high fireproof performance as the flash point and the fire point thereof are both higher than 300 DEG C; the risk of fire and explosion is far lower than that of the traditional transformer oil; and all other performance indexes fully conform to the national standard GB 2536-90 of mineral transformer oil.

The invention provides a kind of environment-friendly transformer oil and the preparation method. The invention takes vegetable oil and the leftovers thereof as the materials, and is prepared after alkali refining, dehydration, esterifying alcoholysis, stopping neutralization, washing and refining, decompression and distillation, decolorization filtration; and after mixing 0.1-5.0 wt percent antioxidant and 0.1-5.0 wt percent pour inhibitor in. The high-grade fatty acid monoester content is 5-95 wt percent; the mono-substituted disubstituted, trisubstituted high-grade fatty acid glyceride contents are 5-95 percent. The appearance of the environment-friendly transformer oil is light-yellow transparent liquid, the kinematic viscosity at 50 DEG C is 2-8mm2/s, the breakdown tension is 40-90KV/2.5mm, and the specific inductive capacity is 2.3-3.2. The environment-friendly transformer oil does not contain sulfur, is innoxious, has high natural decomposability, and can reduce environmental pollution.

The invention provides a method for preparing super- voltage transformer oil. It comprises following steps: making naphthenic base oil contact with hydrogenation treatment catalyst and hydrogenation refining catalyst in sequence under hydrogenation process condition; said hydrogenation treatment catalyst contains a thermal- resistant inorganic oxidant carrier and cobalt and/ or nickel, molybdenum and/ or tungsten and fluoride or phosphorus that loaded on said carrier, the total airspeed of said naphthenic base oil is 0.2- 1 h-1, and the relative airspeed of hydrogenation treatment catalyst is 0.3- 1.2 h-1, the relative airspeed of hydrogenation refining catalyst is 0.3- 2h-1.

The invention relates to a method for online monitoring the content of gas in transformer oil and a system thereof. A gas optoacoustic spectroscopy is adopted to measure the gas dissolved in the transformer oil, namely, after the gas is sent into an opto-acoustic pond, a gas circuit valve is closed, laser sent by a laser is used for radiating sample gas in the opto-acoustic pond, sound wave is generated by the gas which passes through light-absorbing pulse, and the intensity of the sound wave is detected by a rheomicrophone; then, a signal is amplified by preposing and phase locking, and the data of the signal is collected by a high-accuracy digital-analog converter and a DSP data transmitter and stored; at the same time, opto-acoustic phase drift analysis is carried out by a lock-in amplifier, and the running quality or fault category and fault severity of an electrical power unit is exactly judged according to the sorts and the concentration of the gas, thus judging the running state or the property and degree of fault of the electrical power unit with high accuracy. The invention has simple structure and stable running, and can realize online monitoring for a long time.

The invention relates to the technical field of substation state monitoring, in particular to a method and a device for monitoring gas in transformer oil on line. A standard oil sample is subjected to factory delivery calibration during delivery test, the delivery recording of a specified gas sensor is recorded, the peak height test and factory delivery recording of the standard gas are compared and corrected, and the characteristic drift of the gas sensor is corrected and reduced. The method has profound significance for improving the long-term stability of the gas in the transformer oil through the online monitoring system, guaranteeing the transformer safety and stabilizing the operation.

The invention provides a transformer oil-paper insulation frequency domain dielectric loss integral reduction method under different temperature. An oil-paper insulation moisture and aging test product is prepared, and the characteristic quantity-frequency domain dielectric loss integral of the dielectric loss cumulative value of a certain frequency domain section of the oil-paper insulation test product under five different temperature is measured by using an insulation diagnostic instrument IDAX-300; the maximum value of the dielectric loss integral area of the oil-paper insulation moisture and aging test product at the 0.1-10Hz frequency band is acquired, and the maximum value of the dielectric loss integral area acts as a characteristic parameter; and fitting of the measurement temperature and the maximum value of the frequency domain dielectric loss integral area is performed through the least square method so that an expression of the frequency domain dielectric loss integral and aging and wetting under different temperature is acquired. Conversion of the frequency domain dielectric loss integral characteristic quantity under different temperature can be effectively performed so that accurate analysis of the test result of the transformer oil-paper insulation system frequency domain dielectric loss integral under different environmental temperature can be realized, and the influence of the measurement temperature on the transformer insulation state assessment through the frequency domain dielectric loss integral characteristic quantity can be eliminated.

The invention relates to a transformer oil chromatographic detection system and a detection method thereof, comprising a monitoring module, a detection module, a control module, an acquisition and conversion module, a data management module and a data analysis module; wherein, the monitoring module is connected with the detection module, the control module is separately connected with the monitoring module, the detection module and the acquisition and conversion module, the acquisition and conversion module is connected with the detection module, the detection module is connected with the acquisition and conversion module and the data management module in turn, the data management module is connected with the data analysis module and the data analysis module is operated by a user. Aiming to engineering rescue vehicles, the invention applies a self-made source gas, an automatic control function of quantitative oil-taking, a high effect vacuum degassing and an integrated technology of oil-taking, degassing and detection, thus reducing the volume, saving the source and shortening the detection and analysis circle. The invention can be fixed neatly on a car and is suitable to field work for timely discovering the power transformer latent fault and effectively tracking.

The invention discloses a transformer fault diagnosis analysis method based on a bayesian network. The method includes the specific steps: step 1, determining transformer oil chromatography property variables Y = { Y1, Y2, Y3... Yn } and fault type variables D = { D1, D2, D3... Dm }, wherein yi is a value of Y1, dm is a value of Dm, using characteristic gas of a transformer oil chromatography as the transformer oil chromatography property variables, and using transformer fault types as the fault type variables; step 2, determining classification models, structural parameters and probability parameters of the bayesian network according to the transformer oil chromatography property variables and the fault type variables; and step 3, determining the transformer fault types by utilization of a connection tree algorithm.

The invention relates to an absorbent for treating and reclaiming waste liquid oil, in particular for treating and reclaiming waste transformer oil and a production method thereof. The absorbent is characterized in that the absorbent is prepared from the following raw materials according to the weight ratio: sulphuric acid solution, aluminium sulphate solution, sodium silicate solution and ammonia water are mixed, aged, roasted and dried, cleaned and re-roasted; and the finished product of the absorbent is obtained. The absorbent for treating the waste oil has the characteristics of innocuity, noninflammability, nonexplosiveness and so on, and higher capability of adsorbing substances in the waste oil such as acid, carbon microsphere, metal, water content, gel, and the like. The absorbent is sufficiently contacted with the waste oil so as to remove harmful substances in the oil. The absorbent not only has a simple production process, wide raw material sources, low production cost and no environmental pollution, but also has good effect of waste oil treatment, and high yield. The absorbent can save mass production cost for enterprises and energy for the country.

The invention relates to a liquid nitrogen strong cooling transformer and a refrigerating method thereof. The transformer comprises a transformer oil tank and a liquid nitrogen tank; the liquid nitrogen tank is connected with a liquid nitrogen outlet pipe; the transformer oil tank is connected with a gas nitrogen outlet pipe; an evaporating pipe is coiled in the transformer oil tank; one end of the evaporating pipe is communicated with the liquid nitrogen outlet pipe and the other end of the evaporating pipe is communicated with the gas nitrogen outlet pipe; the gas nitrogen outlet pipe is sequentially provided with a liquid nitrogen compressor, a condenser and a throttling valve; the tail end of the gas nitrogen outlet pipe extends into the liquid nitrogen tank; a temperature sensor is arranged in the transformer oil tank; and the liquid nitrogen outlet pipe is provided with a heat preservation electromagnetic valve electrically connected with the temperature sensor. The liquid nitrogen strong cooling transformer and the refrigerating method thereof have the beneficial effects that 1, heat exchange is carried out between liquid nitrogen and transformer oil, heat exchange efficiency is high and gas nitrogen is retransformed into liquid nitrogen by the liquid nitrogen compressor and the condenser and is recycled; and 2, the transformer oil in upper and lower cavities of the transformer oil tank is repeatedly circulated by a transformer oil circulating pipe and a circulating oil pump so as to enable the oil temperature to be balanced.

The invention relates to a cooling method for rectification vacuum pump in ketene dimer production, wherein the method comprises the steps of: placing 25#transformer oil in an oil groove with cooling pipe, when the rectification vacuum pump is operating, pumping the 25#transformer from the oil cooler to the pump for cooling and sealing, combining the ketene dimer taken back from the bottom connected by the rectification vacuum pump to coarse ketene dimer section. The outlet gas of the rectification vacuum pump is pumped in tail gas absorber to spray and absorb ketene dimer. When acid content of circulating recycling liquid reaches 35-50%, the liquid is sent to glacial acetic acid for recycling, and residual carbon dioxide and nitrogen are pumped in the cracking still as fuel. The cooling method of rectification vacuum pump in ketene dimer production utilizes oil to replace water as cooling and sealing of vacuum pump, and uses soft water to absorb gases such as ketene dimer in the vacuum pump, which not only saves a great deal of water reduces emission, but also takes back ketene dimer to save resources and reduce environmental pollution.