32results about How to "Applicable to online monitoring" patented technology

The invention relates to a method and device for online detection of the state of a leakage conductor with a series gap. The method and device are applied to an electric transmission line of an electric system. A conductor action power frequency current collector is connected with a data processor. A counting indicator is respectively connected with the conductor action power frequency current collector and the data processor. The data processor is connected with a failure alarm indicator. The detected action current and continuous actuation time of the leakage conductor with the series gap are adopted to serve as criteria, alarm threshold values are set for the action current and the voltage value of the continuous actuation time, and when the alarm threshold values are reached or exceeded, an alarm is given for state abnormality of the leakage conductor with the series gap, so that the state of the leakage conductor with the series gap is monitored. A passive monitoring method is adopted in the device, the device is simple in structure, state information of the leakage conductor is provided for operation and maintenance personnel in time, and the operation reliability of the leakage conductor with the series gap is improved.

The invention discloses an inverter online open-circuit fault detection method. Firstly, the two-phase current of the inverter is collected, and then the amplitude and phase of the three-phase current at the sampling time are calculated, and then the three-phase current at the sampling time is calculated based on the method. The per-unit value of the sum of the absolute values ​​of the current, compare this per-unit value with the preset threshold to determine whether an open-circuit fault occurs, and if it occurs, perform fault location based on the three-phase current. The specific method is to perform a per-unit Then perform zero-crossing and “one” processing on the unitized current, calculate the fault location identification at the sampling time, compare the fault location identification with the preset threshold, and realize the location detection of the open circuit fault phase and the fault tube. The invention performs on-line processing on the detected load current to perform open-circuit fault detection, reduces fault detection time, and realizes on-line fault detection.

The invention discloses a method for monitoring resistance of valve discs of arresters based on a resistance-capacitance network. The method includes the first step of building an arrestor three-dimensional resistance-capacitance network model based on a three-dimensional finite element static electric field, the second step of solving partition capacitance between the arrestors and capacitance of the valve discs of the arresters, the third step of installing leaked current measurement devices on flanges at the lowest ends of the arresters operating on site, and obtaining actual leaked current measurement values and actual phase angle difference measurement values of the arresters, and the fourth step of solving resistance of the valve discs of the arresters in an iteration mode. The resistance valve of the valve discs of the arresters in operating states can be accurately obtained in the method, errors are controllable, requirements of a project can be met, operation conditions of the arresters are directly and effectively monitored, and meanwhile accurate data references an be provided for power grid operation and maintenance staff; the method is suitable for being used for monitoring a high-voltage zinc oxide arrestor on line.

The invention relates to a method for quantitatively detecting solid fermentation moisture distribution uniformity through the hyper-spectral image technology, and belongs to the technical field of food and agricultural product fermentation relative parameter detection. Firstly, a hyper-spectral image of multiple fermentation substrates under a certain waveband is collected; image information of a region-of-interest is extracted, and fixed wavelength points and corresponding spectrum data in the waveband are selected; n characteristic wavelengths are screened; a prediction model relation expression of moisture content is built according to spectrum reflection values under the characteristic wavelengths and moisture content measured values of all the fermentation substrates; by means of the built relation expression, the moisture content corresponding to each pixel point in the spectral image of the fermentation substrates is detected, and a two-dimensional distribution graph of the moisture content is drawn; the variance value of moisture distribution is calculated; the moisture distribution uniformity of the fermentation substrate is detected according to the variance value of moisture distribution. The method reduces detection cost, increases detection speed, is suitable for online monitoring, and quickly and quantitatively detects moisture distribution uniformity of the fermentation substrate.

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 a detection device and an online water quality detection system provided with the detection device. The detection device comprises a detection tank which is provided with a reagent inlet, a water sample inlet, an air inlet, an overflow hole and a liquid discharge hole, wherein the detection tank is also provided with a mixing hole; the mixing hole is connected with a mixing pump used for mixing the mixed liquid in the detection tank; the mixing pump is connected with a controller used for controlling the work of the mixing pump; the detection tank is also provided with a heating device and a temperature sensor used for detecting the temperature of the wall body of the detection tank; the controller is used for receiving signals of the temperature sensor and controlling the work of the heating device. According to the detection device, the design with multiple functions of reaction, heating, temperature control, mixing, detection, overflowing and the like can be realized, the space occupation area is reduced, installation parts are saved, and the consumption of a water sample and a reagent can be greatly reduced; furthermore, long optical path design is adopted, so that the detection sensitivity is high.

The invention discloses an online monitoring method for the exhaust steam dryness of a low-pressure cylinder of a steam turbine. According to the method, an online monitoring system for the exhaust steam dryness of the low-pressure cylinder of the steam turbine is adopted for carrying out monitoring; in the system, exhaust steam of the low-pressure cylinder of the steam turbine is extracted by a throat of a condenser, enters the condenser through a gas-side inlet of the condenser, and then is discharged to the atmosphere by a gas-side outlet of the condenser and a vacuum pump; a refrigerant inlet and a refrigerant outlet of the condenser are connected with an outlet and an inlet of a refrigerating machine respectively; a drain opening of the condenser is connected with a hot well of the condenser through a drain pipeline; and sensors are correspondingly arranged at the gas-side inlet, the gas-side outlet and the drain opening of the condenser. According to the online monitoring methodfor the exhaust steam dryness of the low-pressure cylinder of the steam turbine, the calculation process is simple, and complex iterative calculation is not needed, so that the online monitoring method is more suitable for online monitoring; and the pressure, the temperature, the flow rate and the humidity of a medium are only required to be measured in the monitoring process, and the obtaining method of the parameters is mature and reliable, so that the relatively accurate parameters can be obtained, and the obtaining cost is relatively low.

An overhead transmission line overvoltage measurement sensor based on coupling electric field relates to the structure of an overhead transmission line overvoltage on-line monitoring sensor. The invention mainly includes a sensor shell, an insulating pad, a fixing plate, a voltage dividing capacitor group, a matching resistor, a coaxial cable, an inner shielding shell, a data acquisition unit and the like. The invention has the characteristics of simple structure, convenient loading and unloading, low cost; high accuracy of measuring overvoltage, good linearity and high precision; strong versatility, wide application range, safe and reliable use, etc.; Overvoltage online monitoring. The invention can be widely used in the online monitoring of overvoltage of overhead transmission lines, and is especially suitable for the online monitoring of overvoltage of 110kV-1000kV high-voltage overhead transmission lines.