30results about How to "No effect on normal operation" patented technology

The invention discloses a method and device for online monitoring and fault identification of a mechanical state of a high-voltage circuit breaker, and relates to the technical field of electrical equipment testing. The method for online monitoring and fault identification of a mechanical state of a high-voltage circuit breaker uses four different sensors to synchronously monitor various parameters of an operating mechanism of the high-voltage circuit breaker during operation, and performs time-domain and frequency-domain analysis on the information obtained by the sensors in different mannersto form a feature hybrid discriminant matrix, thereby realizing on-line monitoring and fault identification of the state of the high-voltage circuit breaker, solving the problem that it is difficultto accurately determine the failure of the high-voltage circuit breaker during the operator's regular inspection only due to perceptual knowledge and experience, improving the inspection efficiency, and saving resources such as manpower and materials.

The invention relates to a downgrading management system of a train control system based on train-train communication. The downgrading management system comprises a safety equipment trackside TKTC system, a safety equipment ID device and a safety equipment ID reader, wherein the safety equipment trackside TKTC system is in communication connection with a vehicle-mounted CC, a safety equipment trackside TKIC, an ATS and the safety equipment ID reader; the safety equipment ID device is in communication connection with the safety equipment ID reader correspondingly; and when the vehicle-mounted CC fails or the train-ground wireless safety communication fails to downgrade, the safety equipment trackside TKTC system performs tasks instead of the vehicle-mounted CC. Compared with the prior art,the downgrading management system can still maintain the normal operation of a failed train and other trains when the vehicle-mounted fault of the train control system based on the train-train communication is downgraded, and the availability and safety of the whole system are ensured.

The invention discloses a sleet melting method suitable for a power transmission line with multiple bundled conductors. The method comprises the following steps: (1). 2-4 sleet melting switches controlled by an electric operating mechanism are arranged at the connection places between a transformer station or a converter station and the power transmission line with the multiple bundled conductors; (2). suspension string insulation, tension string insulation, mid span and jumper insulation are adopted at the power transmission line side to insulate all sub-conductors of the bundle conductors; (3). when the conductors are covered by ice, one or more sleet melting switches are switched off to disconnect the bundled conductors communicated with the sleet melting switches, thus improving the current density of the communicated multiple bundled conductors and improving the calorific value of the communicated conductors to melt ice; and (4). the step (3) is repeated in the same manner to melt ice covering the bundled conductors. By the method, the sleet melting device has the advantages of simple structure, high reliability, and low investment cost; the normal operation mode of the power transmission line is switched to the sleet melting mode in a simple, safe and reliable manner, which has rare impact on the normal operation of a power grid.

The invention discloses an optimized membrane bioreactor (MBR) back washing method. An MBR is operated at constant flux. The method comprises the following steps: I. computing the transmembrane pressure (TMP) of membrane modules of the MBR in a certain period of time; II. computing the similarity S in the certain period of time: specifically, firstly determining the reference value Tref of the TMP and then computing the similarity S by utilizing the TMP according to a formula in the specification; III. comparing the value of S with a preset threshold, washing the membrane modules by an online cleaning mode at different cleaning time if the value of S is not less than the preset threshold, and washing the membrane modules by an online chemical cleaning or offline cleaning mode if the value of S is less than the preset threshold. According to the actual situation of membrane pollution, through low-strength more timely cleaning, pollution of the MBR membrane is eliminated at the initial stage of formation, thus preventing synergistic deterioration effects caused because membrane pollution is not timely recovered, saving energy and time and prolonging the service lives of the membrane modules.

The invention relates to a combined desalting and anti-corrosion method of a catalytic reforming device. According to the method, a dewatering dechlorination tank (7) is additionally arranged behind a stabilizing tower feeding pressurizing pump (6); after the dewatering by the dewatering dechlorination tank, the water content is less than or equal to 15 ug/g; the chloride content is less than or equal to 0.5ug/g; a water washing desalination device (5) is additionally arranged on a tower top liquefied gas tower return backflow flow process; a great number of NH3, H2S and HCl inorganic matters are removed through the water washing desalination device (5), so that the backflow total salt content is reduced to be within 1mg/L. The long-period stable operation of the catalytic reforming device is realized.

The invention discloses a single-end electrical quantity full-line quick-acting protection method using a choke coil to construct the line boundary, according to the topology of different power supplysystems, the choke coil is installed on the line to construct the line boundary, and then the protection criterion is constructed according to the difference of the electric quantity between the protected line area and the internal and external faults, so as to realize the single-end electric quantity full-line quick-action protection. The invention adopts choke coil to construct the boundary ofthe circuit and realizes the single-end quantity full-line quick-acting protection on the circuit without boundary element, As that method of the invention can effectively overcome the problem of lowsensitivity of the pow frequency protection of the alternating current circuit in the multi-converter, It also meets the requirements of fast operation of protection for DC lines. At the same time, itdoes not need protection coordination when applied to distribution network. Only the electrical quantity of a single end can realize the rapid identification of faults inside and outside the protection zone, and it can effectively solve the relay protection problem of a power grid including multiple converters.

The invention discloses an optimized chemical dosing method of membrane subassembly backwashing of a membrane bioreactor. Operation of the membrane bioreactor is carried out at a constant water yield. The optimized chemical dosing method comprises following steps: a current membrane flux change rate dJ/dt of a membrane subassembly of the membrane bioreactor in a continuous water production period is calculated; a membrane flux change rate reference value mu is set, and the specific ratio (R) of the current membrane flux change rate dJ/dt of the membrane subassembly of the membrane bioreactor in the continuous water production period to the membrane flux change rate reference value mu is calculated, R=(dJ/dt)/mu; the value of R is compared with a threshold value, if the value of R is in a threshold value range, chemical dosing amount of membrane subassembly backwashing of the membrane bioreactor is adjusted, otherwise, the chemical dosing amount of membrane subassembly backwashing of the membrane bioreactor is not adjusted. According to the optimized chemical dosing method, the chemical dosing amount is adjusted based on practical situations of membrane contamination so as to eliminate MBR membrane pollution at a forming stage, avoiding collaborative deterioration effect caused because of delayed membrane pollution control, saving time, and prolonging service life of the membrane subassembly.

The invention relates to a direct-current reactor type magnetizing inrush current suppressor. The magnetizing inrush current suppressor is characterized by comprising four diodes, an inductor and a resistor, wherein the positive pole of the diode D1 and the negative pole of the diode D4 are connected with an alternating-current voltage source, the negative pole of the diode D1 is connected with that of the diode D2, the positive pole of the diode D4 is connected with that of the diode D3, the positive pole of the diode D2 and the negative pole of the diode D3 are connected with a generator, the negative pole of the diode D1 and that of the diode D2 are also connected with one ends of the inductor Ld and the resistor rd which are connected together in series, and the other ends of the inductor Ld and the resistor rd which are connected together in series are connected with the positive pole of the diode D4 and that of the diode D3. The magnetizing inrush current suppressor disclosed by the invention is directly accessed into an electric network, at the moment of electrifying, the resistor and the inductor are used for suppressing the mutation of a current, so that the generation of the starting current can be effectively suppressed; during stable operation, the normal running of the generator is not influenced, and besides, the mass production is convenient; the magnetizing inrush current suppressor has a favorable application prospect.

The invention belongs to the technical field of shock absorbing devices of buildings and relates to a horizontal free sliding anti-drawing device. The horizontal free sliding anti-drawing device comprises a first anti-drawing frame, a second anti-drawing frame and an anti-drawing sliding hinge part, wherein the first anti-drawing frame comprises a frame supporting beam, the second anti-drawing frame comprises a frame bearing beam, the frame supporting beam is arranged vertical to the frame bearing beam, the upper part of the anti-drawing sliding hinge part is movably connected to the frame bearing beam, and the lower part of the anti-drawing sliding hinge part is movably connected to the frame supporting beam. The device can be used for preventing the upper and lower structures of buildings from being damaged by horizontal impact of seismic waves, typhoon and the like.

The invention discloses a method and device for online DDL table structure modification of a relational database, and relates to the field of relational databases (MySQL). The method comprises the steps: creating a shadow table according to a DDL function needing to be modified while an original table is not locked and a service system continuously maintains DML operation on the original table; after the shadow table is created, copying the data in the original table into the shadow table; checking the copy data in the shadow table and the data of the original table; and when the verificationresults of the shadow table and the original table are consistent, guaranteeing the consistency of the copied table data, copying and renaming the shadow table of the original table data, replacing the original table. The whole DDL table structure modification process does not affect normal operation of online services at all, and efficient processing of a large number of threads in the table structure modification process is guaranteed, and normal operation of a service system can be maintained, and target writing operation of a front-end application is not affected.

The invention discloses a multi-channel noise based fault diagnosis method of a transformer winding, and relates to the technical field of the fault diagnosis of transformers. The method comprises thefollowing steps of firstly collecting a noise signal of a to-be-detected transformer through multiple channels and recording a current signal; afterwards, carrying out load correction on the currentsignal, so as to obtain a noise signal under a normalized current; secondly, carrying out 9-layer decomposition and reconstruction on the noise signal under the normalized current by adopting a wavelet function, and carrying out characteristic quantity extraction, so as to obtain a characteristic quantity of the noise signal of the to-be-detected transformer; comparing the characteristic quantityof the noise signal of the to-be-detected transformer with a corresponding energy characteristic quantity fingerprint, carrying out correlation analysis on each vector element in a matrix of the characteristic quantity of the noise signal of the to-be-detected transformer, and calculating to obtain a correlation coefficient vector and a negative infinite norm; and finally, judging whether a faulthidden danger exists in the to-be-detected transformer or not according to the value of the infinite norm. The internal structure of the transformer is not influenced in a testing process; the influence on the normal running of the transformer does not exist; and further, whether the fault hidden danger exists in the transformer or not can be accurately judged.

The invention provides an absorption-type unit concentrated solution bypass defrosting device. The absorption-type unit concentrated solution bypass defrosting device comprises a medium flow-in pipeline and a medium flow-out pipeline. The medium flow-in pipeline comprises an absorber, a concentrated solution flowing direction control device and a liquid distributing device, wherein the absorber isused for containing a concentrated solution medium; the concentrated solution flowing direction control device is connected with the absorber, a casing pipe and the input end of the liquid distributing device through pipelines; and the output end of the liquid distributing device is used for being connected with an evaporator of a heat pump unit. The evaporator comprises an air-cooling finned heat exchanger. The air-cooling finned heat exchanger comprises a finned tube. A heat exchange coil pipe and a defrosting coil pipe are arranged in an inner cavity of the finned tube. The defrosting coilpipe is attached to the heat exchange coil pipe. The output end of the liquid distributing device is connected with the defrosting coil pipe through a pipeline. The medium flow-out pipeline comprisesa pump front filter and a solution pump. The input end of the pump front filter is connected with the defrosting coil pipe, and the output end of the pump front filter is connected with an inlet of the solution pump.