Method for detecting concentration of high-temperature gas phase moisture online

The invention relates to the technical field of moisture detection, and particularly relates to a method for detecting the concentration of high-temperature gas phase moisture online. The method is characterized in that a perovskite-type solid metal oxide ABO3 acts as a detection unit, wherein A refers to one or more of calcium or barium, and B refers to one or more of titanium, zirconium or cerium. A preparation method of a detection unit comprises the following steps: preparing a precursor from metal salt by a sol-gel spontaneous combustion method, baking the precursor in a box-type furnace at 300-500 DEG C so as to obtain an oxide powder body, then carrying out ball milling and screening on the powder body to obtain 100-200 meshes of powder, then pelleting and molding the powder at 5-10MPa, baking the molded powder at 1000-1500 DEG C for 10-20 hours so as to obtain a perovskite-type solid metal oxide membrane sheet, connecting leads to two sides of the membrane sheet respectively, sealing ...

Substation equipment insulation online monitoring system and working method thereof

The invention discloses a substation equipment insulation online monitoring system. The system comprises a current measuring device for measuring leakage currents of an MOA or capacitive equipment. The current measuring device comprises a first transformer, a second transformer, a synchronization ADC, a CPU and a communication module, wherein the first transformer is used for acquiring leakage current signals of the MOA or the capacitive equipment, the second transformer is used for acquiring voltage signals of a power grid, the synchronization ADC is connected with the first transformer and the second transformer, the CPU is connected with the synchronization ADC, and the communication module is connected with the CPU. In the system, a method for measuring the resistance leakage currents of the MOA or the capacitive equipment includes the steps that W sample data of power grid voltages and the leakage current signals of the MOA or the capacitive equipment are synchronously sampled at equal ...

Transformer oil chromatography online monitoring method and system based on adaptive neural network fuzzy PID

The invention discloses a fuzzy PID transformer oil chromatography online monitoring method and system based on an adaptive neural network, and the method comprises the following steps: 1) collecting an oil sample, opening an oil inlet valve by the system after the detection time set by a user is up, and enabling transformer oil to enter an oil-gas separator through an oil taking valve port by virtue of the oil pressure of the transformer oil; step 2) oil-gas separation: in an oil-gas separator, fault characteristic gas dissolved in oil is separated out, residual oil enters an oil tank through oil circulation, and the extracted gas is separated by using an oil chromatographic analyzer; and step 3) gas detection: the separated gas enters a gas concentration sensor, gas concentration detection information is converted into a voltage signal, the voltage signal is converted into a digital sequence signal by using a high-precision A/D converter, and whether the operation state of the transformer ...

TECHNIQUE FOR INCREASING YIELD OF BASIC 2-DICHLOROMETHYLBENZIMIDAZOLE

Novel separation system for simulated moving bed chromatography (SMBC)

The invention discloses a novel separation system for a simulated moving bed chromatography (SMBC), and belongs to the technical field of chromatography separation. The separation system adopts a chromatographic column as an operation unit, and comprises N functional bands (N is not less than 5 and not greater than 7), two material inlets, three product outlets and 1-2 eluent inlets. The novel separation system for the simulated moving bed chromatography can be used for separation of mixture with three or more components and producing high-purity products by combination of a conventional simulated moving bed, so that the adsorbent and solvent consumption is reduced.

Crane girder tip structure

The utility model discloses a crane girder tip structure, the key lies in: the crane girder tip is high lower than span centre height, adopts the circular arc transition between tip and the span centre, the span centre web of crane girder is single web, for the fatigue stress who reduces tip web variable cross section department, is three webs with the design of tip web, smooth transition for realizing three webs and single web has designed the transition web between three webs and single web, well intersternite in order to realize the tip damages later to the both sides web, with the thickening of well intersternite, reduces this web fatigue stress. This technique has effectively reduced the fatigue stress of variable cross section crane girder tip web, and the reduction range reaches 30% to 50%, can avoid crane girder web circular arc department of variable cross section department fracture, the tip forms the box cross -section, has increased the stability of crane girder tip, can prevent ...

Dyeing technique for polylactic acid fabric/cotton blended shuttle weaving

The process of dyeing woven polylactic acid fiber/cotton blended fabric belongs to the field of textile dyeing technology. The process of dyeing woven polylactic acid fiber/cotton blended fabric has China produced disperse dye and assistant adopted and improved steps of desizing, boiling and rinsing, mercerizing and dyeing. The dyed product has bright colors, proper shade and high color fastness. The present invention is suitable for industrial production.

Harmonic phase angle analysis method

The invention relates to a harmonic phase angle analysis method comprising the following steps that (1) W+2 sampling point data are sampled (W is determined by an integration method); (2) W+1 data are analyzed from the sampling point i=0 by utilizing a quasi-synchronization DFT formula (expressed in the specification) so that cardinal wave information F(0) and F(0) are acquired; (3) the W+1 data are analyzed from the sampling point i=1 by utilizing the quasi-synchronization DFT formula so that cardinal wave information F(1) and F(1) are acquired; (4) frequency drift mu of signals is calculated by utilizing a formula (expressed in the specification); (5) the W+1 data are analyzed from the sampling point i=0 by utilizing the quasi-synchronization DFT formula so that all frequencies of harmonic wave information F(0) and F(0) are acquired; (6) amplitude phase angles of all frequencies of harmonic waves are calculated by applying a formula phi'=tg ...

Polylactic acid fabric knitted cloth dyeing technique

The process of dyeing knitted fabric of polylactic acid fiber belongs to the field of fabric dyeing technology. The process of dyeing knitted fabric of polylactic acid fiber with disperse dye features the dye amount of 1-3 wt% of the polylactic acid fiber fabric, the dyeing temperature of 95-115 deg.c, the dispersant amount in 0.1-0.3 g/l, the leveling agent amount of 0.4-0.5 g/l, the bath ratio of 1 to 6-14, and the pH value of 3-6. The present invention can reach dye uptake as high as 80 % and high color fastness, and the dyed polylactic acid fiber fabric is bright and beautiful.

MOA resistive current cardinal wave measuring method

The invention relates to an MOA resistive current cardinal wave measuring method. Resistive leakage current cardinal wave parameters are acquired by adopting a projection method. The concrete process is that power grid voltage and MOA leakage current signals are sampled simultaneously; a cardinal wave initial phase angle phi of power grid voltage is acquired by applying a quasi-synchronization DFT harmonic phase angle linear modification method; an MOA leakage current cardinal wave amplitude value I1 and an initial phase angle phi are acquired by applying the quasi-synchronization DFT harmonic phase angle linear modification method; the projection angle phi=phi-phi of leakage current cardinal wave on power grid voltage cardinal wave is acquired according to the projection method; and MOA resistive leakage current cardinal wave I=I<1cosphi> is acquired. According to the MOA resistive current cardinal wave measuring method, the analysis error of the quasi-synchronization ...

Harmonic analysis method of power quality harmonic analyzer

The invention discloses a harmonic analysis method of a power quality harmonic analyzer, wherein the harmonic analysis method is achieved based on the improvement on the quasi-synchronization DFT. The harmonic analysis method comprises the steps that an electrical signal X on which the harmonic analysis needs to be carried out is sampled in a power grid, and data of W+2 sampling points are sampled at equal intervals; when the harmonic analysis is carried out according to the quasi-synchronization DFT, the position of frequency domain sampling is changed according to the drifting value, seen in the specification, of the signal frequency and then the frequency domain sampling position confirms to the value in the specification; the amplitude, seen in the specification, of all harmonics of the electrical signal X and the initial phase angles, seen in the specification, of the harmonics of the electrical signals X are worked out; the amplitude percentage, seen in the specification, of the amplitude ...

Dielectric loss measuring method

The invention relates to a dielectric loss measuring method which is realized by improvement based on quasi-synchronization DFT. The dielectric loss measuring method comprises the following steps that a voltage signal V applied to a tested piece and a current signal I flowing through the tested piece are sampled simultaneously; a cardinal wave phase angle phi applying voltage is acquired by applying a quasi-synchronization DFT harmonic phase angle linear modification method; a cardinal wave initial phase angle phi of the current signal flowing through the tested piece is acquired by applying the quasi-synchronization DFT harmonic phase angle linear modification method; and dielectric loss angle tangent is calculated according to the formula tgdelta=tg[pi/2-(ph-phi)]. The dielectric loss measuring method is suitable for effectively improving analysis error of the quasi-synchronization DFT harmonic analysis technology to acquire a high-precision harmonic phase angle analysis ...

Remote asynchronous power frequency signal phase difference measurement method and system

The invention relates to a remote asynchronous power frequency signal phase difference measurement method and system. The power frequency signal phase difference measurement method comprises the steps that first phase difference between a first measured power frequency signal and a city power reference signal and second phase difference between a second measured power frequency signal and the city power reference signal are acquired, and phase difference between first and second measured power frequency signals is acquired through first and second phase difference. According to the invention, remote asynchronous phase difference measurement is realized; the problem of inconvenient tow wire construction, which is caused by long distance between two measured signals in engineering application, is solved; defects of long distance signal transmission distortion are avoided; the construction difficulty of the measurement system based on a phase difference technology in the fields of power device ...

Power quality harmonic analysis method

The invention discloses a power quality harmonic analysis method which is realized through improvement on the basis of quasi-synchronous DFT (discrete fourier transform). The harmonic analysis method comprises the following steps: sampling an electrical signal X needing harmonic analysis in a power grid, and sampling the data of W+2 sampling points at an equal interval; changing the sampling position of a frequency domain according to the drift micron of signal frequency when the quasi-synchronous DFT is applied to harmonic analysis, namely the sampling position of the frequency domain as a micron2pai/N; calculating the amplitude and initial phase angle of harmonic waves of the electric signal X; and finally, respectively calculating the percentage of amplitude P and amplitude of first harmonic P1, and phase angle difference of higher harmonic and first harmonic P1 of a voltage signal V and a current signal I, and outputting and displaying.

Measurement method of zinc oxide arrester resistive current fundamental wave

The invention relates to a measurement method of zinc oxide arrester resistive current fundamental wave. The measurement method comprises the following steps: obtaining the first phase difference between the leakage current signal of the zinc oxide arrester and the mains supply reference signal, and the second phase difference of the voltage signal of PT equipment and the mains supply referential signal; obtaining the phase difference of the leakage current signal and the voltage signal through the first phase difference and the second phase difference; obtaining the resistive current fundamental wave of the zinc oxide arrester according to the phase difference obtained in the previous step. The measurement method of zinc oxide arrester resistive current fundamental wave, provided by the invention, fundamentally solves the problem related to MOA remote measurement synchronization, can realize resistive current fundamental wave measurement without the need of dragging lines, and has the ...

Capacitive equipment dielectric loss measuring method and system

The invention relates to a capacitive equipment dielectric loss measuring method and system. The capacitive equipment dielectric loss measuring method includes: obtaining a first phase difference of an end screen current signal of capacitive equipment and a commercial power reference signal, and a second phase difference of a voltage signal of PT equipment and the commercial power reference signal, obtaining a phase difference of the end screen current signal of the capacitive equipment and the voltage signal of the PT equipment through the first phase difference and the second phase difference, and obtaining capacitive equipment dielectric loss according to the phase difference. The capacitive equipment dielectric loss measuring method provided by the invention can obtain a high-precision dielectric loss measuring result, fundamentally solves the problem of synchronization of remote measurement of the capacitive equipment, can realize dielectric measurement without a tow line, and has ...