14 results about "Liquid dielectric" patented technology

The invention discloses a modeling method for a streamer discharge process in natural ester insulating oil by considering ionization in bubbles. The modeling method comprises the following steps: 1) constructing a two-dimensional non-axisymmetric model for simulating discharge of bubbles to streamers in the natural ester insulating oil under lightning impulse voltage; 2) introducing a plasma chemical reaction, and constructing a natural ester insulating oil stream discharge electrohydrodynamic model coupled with an ionization process of gas molecules in bubbles; and after a set voltage is applied to the two-dimensional non-axisymmetric model, the natural ester insulating oil streamer discharge electro-hydrodynamic model simulates a natural ester insulating oil streamer morphology evolution process. According to the method, the drift-diffusion-reaction process of the plasma in the bubble and the Poisson equation are subjected to self-consistent solution, and the plasma generation process in the bubble under the strong electric field is integrated into the existing streamer discharge model, so that the method is beneficial to understanding the liquid dielectric breakdown theory.

The present invention relates to a specific combination of esters, a composition comprising it, and its uses as a lubricant and / or liquid dielectric coolant.

The present invention provides an actuator that can easily adjust the electrostatic stress acting between electrodes. [Solution] The actuator comprises an insulating flexible bag that forms a housing, a liquid dielectric filled inside the flexible bag, a plurality of electrodes arranged on the inner circumferential surface of the flexible bag whose separation distance changes according to the applied voltage, an expansion section in which the liquid dielectric present between the electrodes flows in and expands in volume when the separation distance between the electrodes decreases, and a separator inserted between the electrodes. The separator is in the form of a film with its front and back surfaces facing the electrodes and has through holes that penetrate in the thickness direction. As a result, the applied voltage is directly applied to the capacitor portion where only liquid dielectric is filled between the electrodes, and by adjusting the relative permittivity of the liquid dielectric, the amount of charge induced between the electrodes can be adjusted accordingly.

The present application belongs to the field of insulation test, and relates to a plant oil paper composite insulation electrical performance test device and method. The test device comprises an upper section test oil tank and a lower section oil storage oil tank. A support frame is fixedly installed inside the upper section test oil tank, and an electrode device is fixedly installed on the support frame. The electrode device comprises a windowed insulation paper board, two voltage grading rings and an electrode. The electrode is a copper conductor with insulation, which is bent into a T-shaped hanger shape. The test method comprises the following steps: press the plant insulation liquid dielectric from the lower section oil storage oil tank into the upper section test oil tank through a connecting pipe until the electrode device is covered; simulate the change of the electrode gap, i.e. the oil gap, by adjusting the distance between the long oval circles of the electrode; simulate the change of the turn insulation specification by changing the thickness of the insulation paper of the electrode; and realize the test under different operating conditions. The test device is convenient to disassemble and oil injection, strictly controls a single variable, and reduces the influence of the oxidation degree of the insulation oil and impurities on the test.

The application discloses application of an active double-mode microwave micro-flow sensor to liquid dielectric constant detection. The double-mode resonant unit is formed by a microstrip line and a split ring resonator, and has high and low resonant frequency points. The low-frequency resonant frequency point moves to a low frequency with the increase of the dielectric constant, and the high-frequency frequency point moves to a high frequency with the increase of the dielectric constant, thereby effectively increasing the sensitivity of the passive resonant unit. A negative impedance circuit is embedded at the rear end of the microwave passive sensor to form an oscillator, namely a microwave passive resonator and a radio frequency amplifier, and the oscillation frequency changes with the change of the dielectric constant of the material to be detected, and the change of the dielectric constant is mapped to the change of the oscillation frequency. The relationship between the dielectric constant and the resonant frequency is converted to the relationship between the dielectric constant and the direct current voltage through a demodulation circuit. The application has the advantages of high sensitivity, low price, convenience for carrying, etc., and is a high-performance and low-cost system-level detection device which will play an important role in the detection field of liquid materials.

This application relates to the technical field of reactive power compensation, disclosing a reactive power compensation method, system, and storage medium based on an asynchronous motor and a capacitor. The method involves placing a liquid dielectric capacitor next to the asynchronous motor, connecting it to the starting circuit during startup, opening the injection and return solenoid valves, and adjusting the dielectric injection speed in a positive correlation with the motor speed. Once the injection volume reaches the target or startup is complete, injection stops and the state is switched. Injection can be adjusted by cooperating with a hydraulic coupler and a dielectric pump, or the motor can be reversed / linked with an air pump to recover the dielectric during shutdown. Alternatively, the opening and closing degree of the solenoid valve can be adjusted in a positive correlation with the target flow rate, and the return gas pipe pressure can be adjusted in a negative correlation with the target gas flow rate, or the coupling degree of the hydraulic coupler, the opening and closing degree of the solenoid valve, and the height of the return gas pipe inlet can be adjusted in a negative correlation. This method achieves harmonic-free soft start, power factor compensation to 1, avoids the risk of self-excitation during shutdown, simplifies the structure, and has low energy consumption.

Liquefied natural gas has brought about energy hegemonism and environmental destruction. This liquefied natural gas is, however, a liquid dielectric which can be liquefied easily by applying pressure at room temperature, expands in volume by more than 250 times when vaporized, and has a relatively high dielectric constant and a relatively low withstand voltage. As a capacitor, this liquid dielectric is regarded; the energy of the liquid dielectric capacitor is consumed inside the capacitor for use in engines, welding, or producing buoyancy gas, or consumed outside the capacitor for use as an on-board capacitor for a vehicle. The liquid dielectric capacitor is considered to be a dielectric breakdown-inducing igniter as an alternative to the conventional spark plug. In order to utilize the principle of this igniter as an energy source for an engine, a welding device or a gas production device for a buoyancy bag used to lift off seabed resources, an electric charge is applied to a liquid dielectric thin layer, then the thickness of the liquid dielectric thin layer is brought close to zero to cause dielectric breakdown, or the thickness of the liquid dielectric thin layer is increased to create a high voltage source for an on-board capacitor for a vehicle. Thus, a world without environmental destruction is achieved.

An electro-hydraulic actuator includes a deformable shell defining an enclosed internal cavity and containing a liquid dielectric, first and second electrodes on first and second sides, respectively, of the enclosed internal cavity. An electrostatic force between the first and second electrodes upon application of a voltage to one of the electrodes draws the electrodes towards each other to displace the liquid dielectric within the enclosed internal cavity. The shell includes active and inactive areas such that the electrostatic forces between the first and second electrodes displaces the liquid dielectric within the enclosed internal cavity from the active area of the shell to the inactive area of the shell. The first and second electrodes, the deformable shell, and the liquid dielectric cooperate to form a self-healing capacitor, and the liquid dielectric is configured for automatically filling breaches in the liquid dielectric resulting from dielectric breakdown.

This invention relates to the use of a combination of monohydric alcohol fatty acid esters and diesters as a liquid dielectric coolant.

A flexible membrane container for thermal management of an electronic object, the flexible membrane container comprising a first flexible membrane defining a bag-like container having a first interior volume, the container having an opening for removably receiving an electronic object. At least one outflow conduit is disposed in fluid communication with the first interior volume, and at least one inflow conduit is disposed in fluid communication with the first interior volume, thereby enabling a liquid dielectric coolant from a source external to the flexible membrane container to enter into the first interior volume. An insert frame member having a header is configured for releasably attaching to the electronic object. The header provides controls and power connectivity for electronic communication with the electronic object.

This invention discloses a liquid dielectric rod antenna with reconfigurable polarization, comprising an antenna housing, a metal waveguide, a loading container, an RF coaxial probe, and a metal cylinder. The antenna housing is mounted on the metal waveguide, with helical first to third channels arranged along its axis. The loading container has excitation channels passing through its two sides and sealed to the container. The metal waveguide encloses the loading container and has mounting holes communicating with the excitation channels. The inner conductor of the RF coaxial probe extends into the excitation channels and connects to the metal cylinder. The loading container is filled with dimethyl silicone oil. When tetrahydrofuran is injected into the first channel, the dielectric rod antenna operates in circular polarization mode; when tetrahydrofuran is injected into the first to third channels simultaneously, the dielectric rod antenna operates in linear polarization mode. This invention solves the problem that traditional dielectric rod antennas can only operate in a single polarization mode, and has great potential in future wireless communications.

The invention belongs to the technical field of electronic measurement, and particularly relates to a liquid dielectric constant measuring system and method based on an RC transient state. The measuring system comprises a liquid storage container, a measuring circuit, a signal processor and a display terminal, the measuring circuit comprises a parallel-plate capacitor, two polar plates of the parallel-plate capacitor are respectively fixed on opposite inner walls of the liquid storage container, the parallel-plate capacitor is connected with the signal processor, and the signal processor is connected with the display terminal; to-be-detected liquid is injected into the liquid storage container, the parallel plate capacitor is controlled to be charged, the signal processor collects transient voltage-time original data in the charging process of the parallel plate capacitor and transmits the collected data to the display terminal, the display terminal processes the transient voltage-time original data based on an RC zero-state response algorithm, and the display terminal displays the processed transient voltage-time original data. And obtaining and displaying the dielectric constant of the to-be-measured liquid. According to the invention, high-precision, rapid and low-cost liquid dielectric constant measurement can be realized.

The application discloses a double-sided attached liquid dielectric constant detection microwave sensor and belongs to the technical field of microwave sensors. The sensor mainly comprises a thin-wall container 3, a metal defect-free film 1 closely attached to the inner wall of the thin-wall container 3, and a metal microstrip line film 2 attached to the outer wall of the thin-wall container 3; the metal defect-free film 1 and the metal microstrip line film 2 are attached to the inner and outer walls of the same part of the thin-wall container 3, and the lower edges of the two films are flush; the metal defect-free film 1 is composed of a flexible dielectric substrate 5 and a metal reference ground 4 printed on the flexible dielectric substrate 5, the metal reference ground 4 is etched with a nested complementary split ring resonator (NCSRR) 10, and the NCSRR 10 is a dumbbell-shaped CSRR 21 internally nested with a dumbbell-shaped split ring resonator (SRR) 22 which is the same in shape. The microwave sensor is not limited to a rigid flat plate structure, can be used on some substrates with arc shapes, and makes the selection of the substrate more flexible; the new resonance structure NCSRR is proposed, so that the sensitivity is significantly improved, and the quality factor is also improved correspondingly.

This invention provides a high-voltage variable capacitor and its method of use, comprising: a sealable housing assembly with ports; an electrode assembly mounted within the cavity of the housing assembly, the capacitance value of which is adjusted by changing the effective overlap area between the electrodes; and an insulating fluid dielectric filling the cavity to immerse the electrode assembly; the fluid dielectric is a liquid dielectric. This invention also provides a method for operating the capacitor, comprising draining the original first fluid dielectric from the cavity and injecting a second fluid dielectric with a different dielectric constant. Through this structure and method, the user can replace different types of fluid dielectrics, thereby changing the overall capacitance adjustment range and voltage rating of the capacitor. The capacitor of this invention has the advantages of high voltage resistance, small size, high power carrying capacity, flexible application, and relatively low cost.