1339 results about "Gas insulation" patented technology

This invention relates to gas insulation combination electric apparatus partial discharge online detecting and position equipment and its position method. It belongs to electric equipment insulation detecting technique field. This invention includes sensor array consisted by microtrip patch antenna, two groups multiple intelligence selecting switch; two amplify filter, high speed digital collector, computer and control module. The array in this invention is made up by the microtrip patch antennas fixed at GIS basin type insulator, its antenna is made up by rectangular metal patch, medium board, metal platter, coaxial probe type feed line and antenna shielding case. This invention is computer program control, it can online, actual time, quickly, actually poison of GIS inner discharging. This invention can be widely used to electric generator plant booster station and electric network GIS electric substation, it can auto detecting GIS inner partial discharge, and actually poison of partial discharging defect, also it can interconnection run with electric substation and electric generator plant auto monitoring system.

The simulating experiment equipment for local discharge in gas insulated combined electric appliance consists of inducing pressure regulator, no-corona experiment transformer, no-local discharge protecting resistor, standard capacity voltage divider, GIS simulating experimental device, internal UHF antenna sensor and external UHF antenna sensor, microstrip line filtering amplifier, intelligent UHF multiplexer, wide band high speed ultrahigh capacirty digital storage oscilloscope and microcomputer. The simulating experiment equipment and method for local discharge in gas insulated combined electric appliance may be used for simulating various defaults inside GIS to obtain PD experiment data reflecting various kinds of insulation defaults and distinguish the PD modes of the insulation defaults in GIS, so that the present invention may be used widely in relevant theoretical analysis and application research.

The invention discloses a partial discharging experiment device of a structure-variable combined electrical gas-insulated apparatus and a method thereof, and belongs to the technical field of insulation online detection of electrical equipment. The partial discharging experiment device mainly comprises a GIS simulating element, a digital storage oscillograph and a signal generator, etc. By utilizing the device, the partial discharging experiment method carries out a pressurized experiment so as to collect ultrahigh frequency PD signals, carries out a signal injecting experiment, collects and corrects the ultrahigh frequency PD signals through programs, thus obtaining real waveform of the ultrahigh frequency PD signals. The device can simulate the T-shaped, L-shaped and bar-shaped structures of real GIS equipment. The method can carry out the experiment to the T-shaped, L-shaped or bar-shaped GIS structures by one to four insulated defect models, and the experiment is real, accurate and wide in range. The device and the method can be widely applied to the experimental research of the insulated state online monitoring of GIS equipments in teaching practices, scientific research institutions and equipment manufacturing plants, and the detected PD signals can be used for theoretical analysis and applied research.

The invention belongs to the field of on-line monitoring technology of insulative condition of SF6 (sulfur hexafluoride) gas insulated electric equipment, and in particular relates to a gas insulated electric equipment partial discharge multi-source joint detection method. The detection method mainly comprises the steps of preparing a test, cleaning a stainless steel cylinder, filling with SF6 gas, performing an industrial frequency AC SF6 gas PD test, pulse current detection, ultrahigh frequency sensor detection, fluorescent optical fiber sensor detection, discharge gas collection and component detection and the like. The detection method provided by the invention is simple in operation, liable to promote, and provides references for multi-dimensional information joint detection method. The detection method is widely applied to SF6 gas insulated electric equipment partial discharge multi-sensor joint detection under the condition of power frequency, and provides a simple test scheme for multi-dimensional information extraction of PD (Potential Difference) decomposition characteristics and a decomposition theory.

The invention relates to a multi-region detection system for the partial discharge decomposition components of insulating gas and a method thereof, which belong to the technical field of on-line gas-insulated equipment insulation monitoring. The system comprises a voltage regulator, an isolation transformer, a corona-free test transformer, a partial discharge-free protective resistor, a capacitive divider, an insulating gas discharge decomposition device, an ultrahigh-frequency antenna, an oscillograph, a gas chromatograph-mass spectrometer and the like, and the insulating gas discharge decomposition device comprises a housing, insulating sleeves, connecting rods, electrodes, valves, a vacuum meter, a gas pressure meter, a vacuum pump, an SF6 gas bottle, a pure compressed air bottle and the like. The method utilizes the system to respectively detect the discharge decomposition components of multiple regions in the insulating gas discharge decomposition device. The invention can accurately detect the components and component contents of the decomposed gas of a main gas chamber, a glow discharge region and an electron drift region and provide a standard. The invention can be widely applied to the on-line monitoring of gas-insulated equipment insulation, in particular to the on-line monitoring of GIS (gas-insulated switchgear) insulation.

The invention discloses an on-line intelligent monitoring module for intelligent transformer substation GISs, which comprises an SF6 monitoring function module, a circuit beaker monitoring function module, a capacitive equipment monitoring function modules for mutual inductors and the like, a lightning arrester monitoring function module, a station level communication function module and a human-machine interface function module. By means of the function modules, the on-line intelligent monitoring module for intelligent transformer substation GISs can monitor the gas insulation condition in a gas insulated metal-enclosed switchgear (GIS) and the operating condition of the primary equipment of each power system on line, consequently, power system operation maintainers can fully know the operating state of the GIS in real time and accordingly arrange the operation and maintenance time of the equipment, the safety of the operation of the GIS is enhanced, the safe operation of a power grid is effectively guaranteed, moreover, the maintenance method for the GIS is changed from the conventional scheduled maintenance to state maintenance, the equipment maintenance cost is effectively reduced, and the benefit of a power grid operation maintenance enterprise is increased.

The present invention provides a gas-insulated electric apparatus which includes: a vertically-arranged gas insulation main tank; a first gas insulation branch pipe connected to and making right angle with the gas insulation main tank; a second gas insulation branch pipe connected to and making right angle with the gas insulation main tank; a breaker manipulator which is arranged on an upper side of the main tank, a feeder-side current transformer which is incorporated in the first gas insulation branch pipe; a voltage transformer arranged on the first gas insulation branch pipe; and an arrestor arranged on the first gas insulation branch pipe and connected with the feeder.

The invention discloses a method for analyzing decomposition products of SF6 in electric equipment. The method comprises the following steps: sampling; and analyzing and detecting a sample with a chromatograph, wherein the detection part of the chromatograph comprises a thermal conductivity detector (TCD) and fission-product detector (FPD) which are in serial connection, the chromatographic column adopts capillary column GS GasPro, and all the pipelines of the chromatograph must be passivated. By using the invention, the decomposition products such as SO2F2 in SF6 can be accurately analyzed; and by analyzing the decomposition impurities such as SO2F2, the internal operating condition of the SF6 gas isolating device can be effectively judged and the electric equipment failure can be successfully judged.

The invention discloses a device and a method for a partial discharge test of a gas insulated combined electric appliance under impact voltage. The device comprises an impact voltage generator, wherein the impact voltage generator is respectively connected with a voltage divider and a gas insulated combined electric appliance, the gas insulated combined electric appliance comprises a sleeve, one end of the sleeve is connected with the impact voltage generator, the other end of the sleeve is connected with a high voltage conductor, the high voltage conductor is arranged in a chamber, at least one box type insulator is arranged in the chamber, the chamber is divided into multiple defect test chamber units, a current sensor is connected with the chamber, each defect test chamber unit is internally provided with an extra high frequency sensor, an ultrasonic sensor is arranged at an outer surface of the chamber, and the current sensor, the extra high frequency sensors and the ultrasonic sensor are respectively connected with a partial discharge signal processing device. The device can realize detection and result analysis on GIS partial discharge under field-exerted impact voltage.

The invention discloses a calibration system and a calibration method of a partial discharge ultrahigh frequency detection device in the technical field of online detection of the partial discharge of power transformers and gas insulation combination switch devices. The calibration system comprises a standard antenna, a standard pulse source, a detection and control computer and a partial discharge ultrahigh frequency detection device to be detected, wherein the standard pulse source, the detection and control computer and the partial discharge ultrahigh frequency detection device to be detected are connected sequentially. The partial discharge ultrahigh frequency detection device to be detected comprises a sensor for collecting voltage signals. The calibration system further comprises a coaxial cavity, the coaxial cavity is composed of an outer cylinder, an inner cylinder, two outer cones and two inner cones which are coaxial, and a detection window is arranged in the middle of the outer cylinder. The invention also provides the calibration method with the calibration system. The calibration system utilizes the matched coaxial cavity to replace a small GTEM (Giagahertz Transverse Electromagnetic Cell) for the calibration of the partial discharge ultrahigh frequency detection device, and is simple in structure and easy to implement.

This invention relates to gas insulation combination apparatus online monitor method based on virtual device in the device insulation monitor technique field. This invention uses the computer and gas insulation combination apparatus local online test and positioning device and through virtual device technique and comprises parameter setting, online monitor, data analysis, history research four units module computer program and all-day GIS local discharging for online monitoring with multiple data analysis, warning and fault finding and requiring function.

The invention discloses a method for detecting and judging an overheating fault of a bus joint of a gas insulation switch device. The method comprises the following steps of: selecting three temperature measuring points on a shell of a bus, and respectively measuring the temperature of three-phase conductors in the bus; providing an ambient temperature detection point in a predetermined range of the shell so as to obtain the ambient temperature; comparing the temperature of the three-phase conductors and the ambient temperature so as to respectively obtain temperature rises of the three-phase conductors; when the temperature is greater than the predetermined maximum allowed temperature rise, judging as the overheating fault of the bus; otherwise, storing the temperature rises of the three-phase conductors, and obtaining a temperature difference change trend meter according to the stored temperature rises; when the temperature trend meter shows that the temperature rise is continuously increased in the predetermined time, judging as the overheating fault of the bus. By adopting the invention, the accurate on-line detection of the overheating fault of the bus is realized, a failure operation is unnecessary, a bus structure is not improved, and the method has good safety and reliability.

The invention which relates to an automatic constant temperature type photoacoustic detection device for SF6 decomposed components and an experiment method thereof belongs to the technical field of SF6 gas insulation device partial discharge online monitoring. The device is characterized in that an automatic constant temperature system is arranged in present infrared photoacoustic spectrum monitoring systems; and according to the method, the device is utilized to detect the SF6 gas partial discharge decomposed components in a GIS (gas insulated substation) simulation element under automatic preset temperature constancy conditions. According to the invention, the influence of external environment can be eliminated, the gas components of SO2, CO2, CF4, SO2F2, SOF2 and the like with the concentrations of low to 0.01muL/L can be effectively detected, the accuracy, the detection precision and the stability are high, and performances of a solid state relay are stable, so the long-term effective working of the automatic constant temperature system can be guaranteed. The device which can be widely applied to the field of the SF6 gas insulation equipment partial discharge online monitoring is especially suitable for detecting the SF6 gas partial discharge decomposed components in the GIS.

The invention provides a detachable bus unit and a rigid gas insulation electric transmission line. The detachable bus unit comprises a center conductor, a basin-type insulator, a fixed contact, a sliding contact base and an outer shell, the center conductor is arranged in the outer shell, the two ends of the basin-type insulator are fixed to the outer shell, the center conductor is cylindrical, the fixed contact is connected with an insert to achieve electrical connection between the fixed contact and the center conductor, the sliding contact base is of a cylindrical structure, one end of the sliding contact base is in sleeving connection to the center conductor, the other end of the sliding contact base is in sleeved connection to a fixed contact of a first basic bus unit to achieve electrical connection between the center conductor and the fixed contact of the first basic bus unit, and the first basic bus unit is a bus unit connected with the detachable bus unit and located on the left side of the detachable bus unit in the rigid gas insulation electric transmission line. The detachable bus unit is a simple detachable bus unit and has the higher long-term through-current capacity and the higher short-circuit fault through-current capacity.

The invention belongs to the technical field of on-line monitoring temperature of contact temperature of a gas insulated composite appliance, in particularly relates to an isolation switch contact temperature monitoring model for GIS shell and environment temperature measurement. A GIS isolation switch temperature rise test loop is used for providing experimental large current to a GIS isolation switch and comprises a large current generator, a bus 1, a circuit breaker and a bus 2 connected in order, and the large current generator, the bus 1, the circuit breaker and the bus 2 are connected in series and then are connected to the GIS isolation switch to form an experimental loop. The GIS isolation switch comprises a GIS isolation switch and a shielding cover which is arranged outside the GIS isolation switch. A sensor is arranged at the surface of a GIS isolation switch shell and is used for testing a shell temperature in a test. The model can be widely applied to GIS isolation switch contact temperature monitoring based on GIS isolation switch shell and environment temperature measurement, and a simple and easy method is provided for GIS isolation switch contact temperature monitoring research.

The invention provides an efficient gas insulated electrical machinery, capable of preventing the insulativity of the insulated electrical machinery from being aggravated by using gases containing CF3I as an insulated gas having small warmer coefficient. The device includes: a sealing container for enclosing an insulated gas; a vacuum circuit breaker and cutter, which are mounted in the sealing container and are electrical-insulated with the sealing container, characterized in that, the vacuum circuit breaker is able to prevent the arc light from leaking out the vaccum container when the current is turned off, the insulated gas is a mixed gas comprising CF3I having volumetric ratio of over 40% and the other insulated gas having lower condensing temperature than CF3I and smaller earth warmered coefficient than SF6, the air pressure of the mixed gas is 0.1-0.3 MPa.abs, moreover, there is provided with an adsorbent, which can adsorb a low-molecular-weight compound produced by the dissociation of CF3I.

The invention relates to a gas insulation combination electric appliance internal local discharge detector, belonging to the high voltage insulation detection technical field, for resolving the problem that the prior art can not effectively filter environment signals and interference signals in detection. The gas insulation combination electric appliance internal local discharge detector comprises a shield ring outside a GIS insulation sub ring, which is provided with a detection window; an antenna group and a detection unit, while the antenna unit at least comprises a first antenna unit and a second antenna unit and the detection unit comprises a signal operation circuit for eliminating the environment interference signals in the received GIS leakage signal to obtain a GIS local discharge signal. The gas insulation combination electric appliance internal local discharge detector can correctly detect various local discharges in GIS in early period, without error and leaked judgment. For the integrated online detection system, the gas insulation combination electric appliance internal local discharge detector has reduced cost and can realize simple and effectively following treatments.

The invention discloses an identification method of an insulation defect type of a gas-insulated switchgear, which comprises the following steps that 1, a partial discharge ultrahigh frequency signal of the gas-insulated switchgear is collected; 2, filtering and noise reduction are performed on the partial discharge ultrahigh frequency signal; 3, an envelope of the partial discharge ultrahigh frequency signal is obtained; 4, five characteristic values including a pulse peak Vtop, a trough Vv1 which early appears after the pulse peak, a peak Vp1 which early appears after the pulse peak, a trough Vv2 which appears later after the pulse peak and a peak Vp2 which appears later after the pulse peak are extracted from the envelope; 5, the five characteristic values are formed to construct a characteristic aggregate, and three characteristics with the highest degree of differentiation are taken from the characteristic aggregate to construct a three-dimensional characteristic space; 6, sample data of the partial discharge signal which corresponds to a typical partial discharge type are adopted to train a sample space training classifier; and 7, the trained sample space training classifier is used for classifying and identifying the partial discharge type which is mapped to the three-dimensional characteristic space.

The invention discloses a method for diagnosing overheat fault of joints of a gas insulated switch equipment bus. The method comprises the following steps: determining three joint detection points of three-phase joints of the gas insulated switch equipment bus and detecting the joint temperature value of each phase joint of the gas insulated switch equipment bus respectively; determining three conductor detection points of three-phase conductors of the gas insulated switch equipment bus according to the three joint detection points and detecting the conductor temperature value of each phase conductor of the gas insulated switch equipment bus respectively; and judging each phase joint of the gas insulated switch equipment bus is in overheat fault or not according to the temperature value of the three joints and the temperature value of the three corresponding conductors. Correspondingly, the invention also provides a system for diagnosing the overheat fault of the joints of the gas insulated switch equipment bus. By the method and the system, the overheat fault of the bus joints can be judged, the fault type of the three-phase joints can be determined and the diagnosis result is not influenced by the environmental factor.

The UHF detection equipment for local discharge in gas insulated combined electric appliance consists of seven parts of gas insulated combined electric appliance, leaked electromagnetic wave, UHF ultrawideband vibrator antenna sensor, coaxial RF cables, amplifying filter, high speed digital sampler, bus and computer. The present invention has effectively increased UHF detecting bandwidth and raised detecting sensitivity and S/N ratio, so that it can obtain accurate local discharge information. The present invention may be used widely in insulation state monitoring of gas insulated high voltage equipment with SF6 breaker, gas insulated cable, etc.

The invention provides a simulated experiment method of overheat faults of a contact surface in sulfur hexafluoride gas insulation equipment, belonging to the technical field of online monitoring of an insulation state of the SF6 gas insulation equipment. The method provided by the invention utilizes a 'simulation device of the overheat faults of the contact surface in the sulfur hexafluoride gas insulation equipment' applied by the applicant to carry out simulated experiment on the overheat faults of the contact surface in the SF6 gas insulation equipment. According to the method provided by the invention, the overheat faults of the contact surface in the SF6 gas insulation equipment can be simulated and the method has the characteristics of high simulation accuracy, high detection precision, simple experiment method, safety, easiness of mastering, convenience for popularization and application and the like. The simulated experiment method can be widely applied to simulating the overheat faults in the SF6 gas insulation equipment and particularly simulating the overheat faults of the contact surface in the SF6 gas insulation equipment.

In a conventional gas pressure monitoring system that detects a gas leak inside the hermetic container using temperatures measured by the temperature sensor provided outside the hermetic container, there exist uncertain temperature differences between actual temperatures inside the hermetic container and measured temperatures. Thus it is difficult to obtain from a pressure measured inside the hermetic container, an equivalent pressure converted to one at a predetermined temperature, so that it is not possible to early detect a gas leak. By removing the influence of the uncertain differences between temperatures inside and outside the hermetic container, from characteristic-curve slopes obtained from time-series measurements in pressure and temperature during predetermined periods at intervals of 24 hours, it becomes possible to obtain an equivalent pressure inside the hermetic container with a high accuracy, to detect a gas leak at early stages.

The present invention relates to novel high pressure combination independent electronic type current, voltage transformer, which includes inverted vertical SF6 gas insulation current mutual-inductor, electronic voltage mutual inductor, signal conditioning modulation circuit and direct current supply, the conventional iron-core coil inverted vertical SF6 gas insulation current mutual-inductor of the conventional iron-core coil is taken placed by hollow coil or low power iron-core coil and hollow coil, the insulated low-voltage electric pole is fixed by using the same insulator of current transformer at inner layer of the double-layer shielding barrel, and the low-voltage electric pole has same center with the primary conductor and double-layer shielding barrel, a conducting wire is fixed or welded at the low-voltage electric pole and the inner layer of the double-layer shielding barrel respectively, the output lead of the current secondary winding and the output conducting wire of the voltage transformer secondary sensing connect with the current of the signal conditioning modulation circuit and the input terminal of the electric voltage channel respectively, the direct current supply connects with the signal conditioning modulation circuit. The present invention adopts SF6 as main insulation with simple insulation structure and high insulating intensity, and overcoming defect of electronic type current and voltage transformer and reducing cost greatly.

A gas-insulated switchgear includes a tank filled with an electrically insulating gas, first and second conductors disposed within the tank, a disconnector for disconnecting the first conductor and the second conductor from each other, and a grounding switch for grounding the first conductor when the disconnector is in an open position. The disconnector includes a first and second fixed electrode disposed on the first and second conductors, respectively, a bridging movable electrode that is always maintained in contact with the first electrode and that is slidably movable for contacting with and separating from the second fixed electrode to connect and disconnect the first and second fixed electrodes, and an operating mechanism for opening and closing operation of the movable electrode. The grounding switch includes the bridging movable electrode which is in contact with the first contact, and a third fixed grounding electrode disposed to the tank capable of contacting with the movable electrode when the movable electrode is separated from the second electrode. The operating mechanism is provided with an electrically insulating operating rod extending through the first fixed electrode in the direction of movement of the movable electrode.

The invention discloses a decomposition simulation experiment method for sulfur hexafluoride gas insulating medium electro-thermo combination. A decomposition experiment system for sulfur hexafluoride under the application number 201310551600.2 is used, and the method includes the steps of examining seal performance of the experiment system, cleaning a cylinder and performing SF6 gas filling. The method further includes the following steps that the maximum externally exerted experiment voltage Umax is measured, a parallel-plate electrode and a heating body are installed, initial discharging voltage Ust is measured, the initial decomposition temperature T0 of SF6 is measured when experiment voltage U=0.5 Ust, and an decomposition experiment is performed on SF6 at different temperatures when the experiment voltage U=0.5 Ust. The method has the advantages that the failure state of electro-thermo combination in SF6 gas insulation electrical equipment can be simulated, the defects that an existing experiment method and an existing evaluation method evaluate the state of the SF6 insulation electrical equipment through detecting components of SF6 decomposed gas, and take a discharging failure or an overheating failure in the SF6 gas insulation electrical equipment into consideration instead of both the discharging failure and the overheating failure are overcome, and the accuracy of judging the failures of the SF6 gas insulation electrical equipment is improved.