180results about "Material breakdown voltage" patented technology

The invention discloses a method for detecting composite insulator interface defects; according to the method, DC voltage leakage current characteristic tests of a composite insulator before and after a water boiling test are performed; power function fitting of the DV voltage and corresponding leakage current data and curves obtained in the measurement is performed; interface defects of the composite insulator are discriminated according to the fitting results; and discrimination determination can be performed by using characteristic coefficient ratios or characteristic index change rates. The method provided by the invention overcomes the disadvantage that withstand voltage tests and steep impulse tests can not sensitively reflect composite insulator interface defects; the method of the invention is simple and effective, and is applicable to the detection of 35-1000 kV AC-DC composite insulator interface defects.

The present invention is detection equipment based on electric leakage imprinting resistance and electric corrosion wear resistance of electric insulating material, and is suitable for the electric leakage imprinting resistance test of electric insulating material. The detection equipment includes test transformer inside a casing, stepped motor on the fixing rack, driving gear on the shaft of the stepped motor and meshed driven gear, lead screw mounted to the driven gear and connected liquid pushing board and liquid pushing unit, limiting resistor, and tested sampler holder in the position corresponding to the liquid pushing unit. The limiting resistor is connected to the test transformer and the upper electrode on the tested sample holder, and the lower electrode of the tested sampler holder is grounded. During operation, the motor rotates the driving gear and the driven gear and pushes the liquid pushing board to move downwards for dropping the corrosive liquid to the tested sample.

A monitoring system includes an acoustic emission monitoring system including acoustic emission sensors, a partial discharge monitoring system including partial discharge sensors and synchronized with the acoustic emission monitoring system, and a computer receiving acoustic emission data from the acoustic emission sensors and electrical data from the partial discharge sensors. The computer is configured to classify a first statistical event as a fatigue cracking event by pattern recognition of the acoustic emission data and determine a first location and a first damage condition resulting from the fatigue cracking event, classify a second statistical event as a partial discharge event by pattern recognition of the acoustic emission data or the electrical data, and fuse the acoustic emission data and the electrical data for the second statistical event and determine a second location and a second damage condition resulting from the partial discharge event. Methods of monitoring are also disclosed.

While a sealed package (3) prepared by wrapping conductive contents (1) with an electric-insulation film (2) is being conveyed by two conveyors (4, 4), front and rear, a conductor (5) disposed on one side of a conveyance path (A) and at least one of two conductors (6, 6), front and rear, disposed on the other side are simultaneously contacted with opposed surfaces of the sealed package (3) being conveyed. In this state, a high voltage from a high voltage source (7) is applied to the sealed package (3), and a current detector (8) is used to detect whether or not a change in current is occurring in the portion which is in contact with the conductor (5) and the portion which is in contact with at least one of the two conductors (6, 6) so as to find pinholes in the sealed package (3). Whether or not there is a pinhole in at least one of the opposed surfaces in the portion of the sealed package (3) where the contents (1) exist can be detected by simultaneous inspection from both surfaces. Pinhole inspection can be effected by increasing the applied voltage.

A method is provided for characterizing emulsion stability to evaluate suitability of the emulsion for use as a drilling fluid in drilling subterranean boreholes. The method provides a supplement or alternative to the standard method of determining Electrical Stability of the emulsion. In the method of the invention, Breakdown Energy is calculated. Breakdown Energy can be measured at the same test point as Electrical Stability. A digital storage oscilloscope and a computer are used in addition to an electrical stability meter.

The invention relates to an electric strength inspection device for oil paper compound insulation oil during flowing, belongs to the technical field of high voltage and insulation, and aims at solving the problems of difficulty in mounting and frequent flashover caused by processing errors of the existing electric strength inspection devices. The electric strength inspection device comprises a high-voltage bushing, a lower connecting piece of the high-voltage bushing, an upper electrode connecting piece, an upper electrode, an upper electrode insulating member, a lower electrode insulating member, an insulating screw rod, an insulating nut, a lower electrode, an insulating paper board, an oil duct, an earthing bolt, an oil inlet, an oil outlet, an oil inlet connecting piece and an oil outlet connecting piece, wherein the low connecting piece of the high-voltage bushing, the upper electrode connecting piece, the upper electrode, the upper electrode insulating member, the lower electrode insulating member, the insulating screw rod, the insulating nut, the lower electrode, the insulating paper board, the oil duct and the earthing bolt are arranged in a high-voltage test box, the upper electrode is arranged right above the lower electrode and is embedded in the upper electrode insulating member, the lower electrode is embedded in the lower electrode insulating member, and the upper electrode insulating member is arranged above the lower electrode insulating member.

The invention discloses a method for rapidly judging poor insulation of a soft package lithium ion battery aluminium-plastic film. The method comprises the following steps: 1) enabling a probe to be pierced into any seal edge of a soft package lithium ion battery to enable the probe to make contact with an aluminium layer of the aluminium-plastic film, and then, enabling the probe and the positive electrode lug or negative electrode lug of the soft package lithium ion battery to be connected with the two electrodes of an adjustable voltage DC power source through wires respectively, wherein the voltage of the adjustable voltage DC power source is equal to or larger than 400V; and 2) starting the power source, if the seal edge of the soft package lithium ion battery has liquid leakage, breakdown or smoking phenomenon, judging that the aluminium-plastic film insulation is poor at the seal edge place; and if the seal edge of the soft package lithium ion battery does not have liquid leakage, breakdown or smoking phenomenon, judging that the aluminium-plastic film insulation at the seal edge of the soft package lithium ion battery is good. With the method, the insulation state of the soft package lithium ion battery can he judged quickly, and meanwhile, the specific position of microdefect in the aluminum-plastic film can be determined, so that technicists are allowed to carry out optimization adjustment on the operation state of heat-seal equipment or heat-seal parameters in time conveniently.

The invention relates particularly to methods and apparatuses for characterizing water-in-oil or invert emulsion fluids for use in drilling well bores in hydro-carbon bearing subterranean formations. A fluid stability measurement method is described. The method includes placing a sample of an emulsion in a gap between electrodes, disturbing the sample, measuring the electrical stability of the sample, and establishing a relationship between electrical stability and time since the sample was disturbed.

The invention relates particularly to methods and apparatuses for characterizing water-in-oil or invert emulsion fluids for use in drilling well bores in hydro-carbon bearing subterranean formations. A fluid stability measurement device is disclosed. The device comprises a reference electrode and a second electrode coupled to an insulating body. A guard electrode is placed in the path between the reference electrode and the second electrode on the surface of the insulating body.

This invention discloses one method to estimate and monitor dielectric layer quality and reliability, which comprises the following steps: first setting deficiency to result the puncture of dielectric layer; exerting field onto tested dielectric layer to get puncture voltage of VBD; setting the tested dielectric intensity as EDS as certain value under process condition; getting tested dielectric thickness dEQ for comparison between puncture voltage with dielectric intensity; comparing the thickness with the tested dielectric layer production to get real dielectric thickness and design.

The present invention is test method and device for repeated nanosecond pulse medium breakdown characteristic. After determining the output voltage of pulse power source and regulating the gap between breakdown electrodes, the pulse generator sends out the enabling pulse, the pulse power source outputs repeated high voltage pulses, the oscilloscope is triggered and one channel is broken down. After certain tolerance time, the gap between breakdown electrodes is broken down, the voltage sensor and the current sensor detect the breakdown voltage and the breakdown current, and the oscilloscope records the breakdown voltage signal and the breakdown current signal. Then, the oscilloscope sends out one low level signal through its TTL logic port, one other measuring channel of the oscilloscope detects the signal while the outer trigger port of the pulse generator receives the signal for automatic shut off, and the voltage, current and tolerance time signals are measured.

The invention relates to a method of using a discharge gas sensor to directly measure the density of gas and nano carbon pipe film gas sensor, including the characteristics that: measure breakdown voltage of the sensor by discharge characteristics testing system to acquire one or two or multiple dimensional original model; use interpolation fitting process to build interpolation original model; do monodromy conversion and build the secondary rebuilt model of the sensor; build verse modle of the secondary rebuilt model the sensor is made of two pieces of ITO film conducting glass or two pieces of conducting glass material, whose two poles both hate multiply holes pasting to carbon millimicron pipe film and the distance of poles is structural characteristic parameter.

The invention relates to a method for detecting the integrity of a gate oxide, which comprises the following steps of: acquiring the minimum sample number according to the significance level, the failure number and the defect density of an object; performing a ramp voltage test on tested chips with the sample number of greater than or equal to the minimum sample number; and estimating whether the tested chips pass the ramp voltage test or not. The method for detecting the integrity of the gate oxide can acquire more economical and accurate test results.

The invention provides a liquid helium and superflow helium temperature zone insulating material high-voltage electrical performance test experiment platform. The platform comprises a vacuum chamber,a first-stage test chamber and a second-stage test chamber which are nested layer by layer from outside to inside. A refrigerator is used for providing cold energy for a liquid helium temperature zonetest platform in the first-stage test chamber, so that the test requirement of the insulating material under the 4.2 K temperature zone use condition can be met; and the second-stage test chamber isin contact with a liquid helium temperature zone test platform, helium is introduced, and the cooling capacity is provided for the liquid helium temperature zone test platform by adopting the refrigerator, helium introduced into the helium condensation cavity is liquefied under the action of the refrigerator; liquefied helium is converted into superfluid helium through a throttle valve and an airexhaust pressure reduction pipeline, and the superfluid helium is output into the superfluid helium cavity to provide cold energy for a superfluid helium zone test platform in the secondary test chamber, so that the test requirement of the insulating material under the 1.8 K temperature area use condition can be met.

The invention provides a method and a device for on-line withstand voltage detection of a film sintered electromagnetic wire, wherein an insulation tank is arranged at the leading-out terminal of the film sintered electromagnetic wire, the tank therein is filled with conducting liquid medium, the film sintered electromagnetic wire passes through the conducting liquid medium in the insulation tank; the conducting wire before winding and sintering is used as an earth electrode, the conducting liquid medium is switched in a high voltage so as to form voltage at the two insulation sides of the electromagnetic wire; a leakage current detecting and alarming device is led out from the conducting liquid medium and connected with a remote control system through a network interface; when the electromagnetic wire has bare wire, burrs, film damage and incomplete film sintering, leakage current is generated, and when the leakage current exceeds the alarm leakage current set by the leakage current detecting and alarming device, the leakage current detecting and alarming device alarms and stops.

The object of the invention is to provide a container inspection method and a container inspection device which is not container quality inspection by individual and operator's empirical approach, not influenced by operator's skillfulness, can eliminate human error such as missing when recording and error in writing, not based on operator's subjective judgment, whose result is objective, and easily and statistically stores objective data. The container inspection method and container inspection device comprises an inspection for a container formed of a web-like packaging laminated material, which includes peeling flaps from the container wall by a pre-processing unit, cutting the container wall to prepare a sampled body by a sampled body preparing unit, inspecting seal quality by a seal quality unit, inspecting seal zone by an image processing unit, and inspecting damage on the seal zone by a seal damage inspection unit.

The invention discloses an electric strength measurement device for rubber-like materials, belongs to the technical field of electric strength measurement, and solves the problem that measurement results of an existing measurement device of rubber-like materials are lack of guiding significance on design of electric cable accessories. The electric strength measurement device is characterized in that an upper bottom plate and a lower bottom plate are fixedly connected through struts, a spring bearer plate and an electrode bearer plate are slidably connected to the struts, and pressure springs are located between the spring bearer plate and the electrode bearer plate; a pressure screw drives the spring bearer plate to move vertically; the middle portion of a rubber sample is arranged at the position between an upper electrode and a lower electrode while two ends of the same are clamped through sample holders; a sample-fixing holder is fixedly connected with the lower bottom plate, a sample-moving holder is slidably mounted on an auxiliary slide, a first slide bearing is connected with the sample-moving holder through a screw, and a nut is mounted on the outer end, penetrating the first slide bearing, of the screw. By the arrangement, electric strength of hold-tight force on measurement of the rubber materials under tensile and stress states is simulated, accuracy in measurement is achieved, and the measurement results are of great guiding significance to design of the electric cable accessories.

The invention discloses a nerve cell discharge performance detection method under the variable concentration medicine action. The method is characterized by comprising steps of: firstly, preparing nerve cells cultured in vitro into a cell suspension, adding the cell suspension into a biocompatible glass lantern ring of a microelectrode array chip, and contacting part cell wall structures of the nerve cells with a microelectrode of a microelectrode array so as to form a bioelectric port; adding the medicine with the concentration of 1 microgram/ml into the biocompatible glass lantern ring, putting the microelectrode array chip on a microelectrode array system support, stimulating the nerve cells through a 1mV excitation pulse signal generated by a microelectrode array (EMA) system, gradually changing the voltage amplitude of the excitation pulse signal from low to high through according to an increment of 1mV, wherein the voltage amplitude value of the excitation pulse signal is utilized when the nerve cells generate standard action potential signals as the condition threshold value of the electro-excitation signal at the current medicine concentration; and changing the medicine concentration according to the concentration gradient of 1 microgram/ml, and continuously detecting the corresponding condition threshold value of the electro-excitation signal.

The invention provides a data conjoint analysis method applied to a transformer oiling detection test, and belongs to the technical field of power transformation detection test data analysis and power equipment operation state evaluation. According to the method, a power transformation five-way detection test item is taken as a basis, and an insulating oil performance state is taken as an evaluation target, so that a data joint intelligent analysis method and strategy for evaluating the insulating performance of the insulating oil of the oil-filled transformer are provided. According to the method and the strategy, an oiling test data selection principle strongly associated with the insulating oil state of a single device and a decision factor determination method thereof are determined, an insulating oil performance index is calculated by establishing a transformer insulating oil performance index evaluation model, comprehensive evaluation of the insulating state of the transformer insulating oil is achieved to the maximum extent, and therefore, the health state of the transformer, especially the health state of the oil-filled transformer, can be evaluated more accurately.

The invention provides a metal particle harmless experimental apparatus and method, allowing ratio and pressure of mixed gas to be adjusted as required, allowing various metal particle experiments tobe carried out and allowing metal particle experiments to be implemented in different mixed gas environments. The apparatus comprises an SF6 mixed gas charging and recycling device, a metal chamber, an electrode module, an adsorbing device, and a metal particle capture device; the metal chamber includes a left gas compartment and a right gas compartment each of which is fitted with an insulator; the metal particle capture device is mounted in the right gas compartment; the adsorbing device is mounted in the left gas compartment; the SF6 mixed gas charging and recycling device is connected to the left and right gas compartments of the metal chamber; the electrode module is mounted in the metal chamber and is coaxial to the metal chamber. The metal particle harmless experimental apparatus and method allow metal particle harmless experiments to be efficiently carried out on mixed gases different in concentration and pressure, allows the mixed gases to be recycled to increase resource utilization and save experiment cost, and allows substantially zero emission of SF6 to the air.

The present invention discloses a multiple insulation sample partial discharge test electrode device which comprises an earth electrode, a high pressure electrode and a conductive rod connected with the high pressure electrode. The invention also comprises a high pressure electrode plate, a supporting insulator and an insulating base plate. One end of the supporting insulator is permanently connected with the high pressure electrode plate and the other end is permanently connected with the insulating base plate. One end of the conductive rod is permanently connected with the high pressure electrode plate and is conducted, and the other end is connected with the high pressure electrode and is conducted. The high pressure electrode is arranged at the upper part of the insulator to be measured. The insulator to be measured contacts the earth electrode. The number of conductive rods, high pressure electrodes and earth electrodes are at least two respectively and these components are arranged at the circumference of the supporting insulator with one-to-one correspondence. The invention can simulate various typical single defect or mixed defect at the inner part of the high pressure electric power equipment. The characteristics of partial discharge signals which are generated simultaneously by a plurality of insulation samples or a plurality of insulation defects are obtained. The reliability and objectivity for on-line monitoring the inner insulation defect of the electric power device is increased.

The invention discloses a detecting method and detecting equipment for an ultrahigh vacuum accelerating pipe process section and relates to the treatment and detection of an ultrahigh vacuum metal ceramic welded accelerating pipe process section of an electronic accelerator. The voltage training and detection are gradually carried out on all clearances of a detected process section; after the voltage of a small high-voltage power supply is gradually increased till the detected clearances generate fire striking or electricity leakage, the high-voltage training starts to be carried out; when the voltage is raised to 2.5 times of rated working voltage and reaches a specified electricity leakage and fire striking frequency limit value, the high-voltage training of the clearance is finished, and the quality reaches the standard; only if all clearances reach the standard, the detected process section is judged to be qualified. In order to overcome the defects, the invention provides the detecting method and the detecting equipment for the ultrahigh vacuum accelerating pipe process section, which have a scale production way and are beneficial to improving the production efficiency, reducing the cost and ensuring the quality.