113results about How to "Reduce failure loss" patented technology

The invention provides a fault on-line diagnosis and early warning method of a flameproof dry-type transformer for mine in order to raise the accuracy and rapidity of fault diagnosis. The method comprises the following steps: determining monitoring quantity; extracting characteristic values: extracting a three-dimensional spectra parameter and two-dimensional statistical parameter in a partial discharge signal as characteristic quantities, with regard to operation voltage, current and iron core leakage current, extracting effective values of the operation voltage, the current and the iron core leakage current as characteristic values, and taking real-time values of a temperature parameter as characteristic quantities; using a normalization method to calculate a corresponding value of each characteristic quantity and taking the corresponding value as an input parameter of an intelligent diagnosis system; collecting values of each monitoring quantity under different environment, and obtaining training and testing samples of a nerve network under corresponding environment; establishing a nerve network: selecting a generalized RBF nerve network intelligent diagnosis method to establish a nerve network; utilizing a sample data training nerve network and forming a fault diagnosis tool; establishing a database; storing collected real time data and the above diagnosis result into a ground server real-time database and a real-time early warning information table, and carrying out diagnosis and early warning through an expert system.

The invention provides a visual grid system and a fault identification method thereof. A visual information graph of a transformer substation and a visual geographic information graph of a grid are built, the position of the faulted transformer substation and the position of a faulted device are marked on the visual geographic information graph of the grid and the visual information graph of the transformer substation respectively when the transformer substation is faulted, so that a dispatcher can rapidly and directly obtain information of the positions of the faulted transformer substation and the faulted device, faults are rapidly isolated and recovered, and fault loss is decreased.

The invention provides a single-phase two-tube five-level rectifier based on a hybrid H bridge. The rectifier comprises a switching tube Q1 and a switching tube Q2, one side of an alternating currentpower supply Vs is connected with the anode of a diode D1 and the cathode of a diode D2, and the connection node forms an end point b; the connection nodes of the other end of an inductor L and diodesD3, D4, D5 and D6 form end points a; the connection nodes of the drain electrode of the switching tube Q1 and the diodes D1, D3 and D7 form end points c; the connection nodes of the source electrodeof the switching tube Q1 and the diodes D2, D4 and D8 form end points d; the anode of the diode D8 is connected with the negative electrode of a capacitor C2 to form an end point m; the anode of the diode D11, the cathode of the diode D12 and the positive electrode of the capacitor C2 are connected with the negative electrode of a capacitor C1 to form an end point n; the cathode of the diode D7 isconnected with the positive electrode of the capacitor C1 to form an end point p. The end point a, the end point c, the end point d and the end point n form four ports of the hybrid H bridge. The rectifier has the advantages of being high in output direct-current voltage, small in harmonic content, low in switching tube stress, easy to control and the like.

A single-phase five-level power factor correction circuit based on a hybrid H bridge comprises switching tubes Q1, Q2 and Q3. One side of an alternating-current power supply Vs is connected with an anode of a diode D1 and a cathode of a diode D2, and a connection node forms an end point b. The other side of the alternating-current power supply Vs is connected with one end of an inductor L, the other end of the inductor L is connected with the anode of a diode D3 and the cathode of a diode D4, and connection nodes form an end point a. The drain electrode of the switching tube Q3 is connected with the cathode of the diode D1, the cathode of the diode D3, the anode of the diode D7, the drain electrode of the switching tube Q1 and a connection node to form an end point c. The source electrodeof the switching tube Q3 is connected with the anode of a diode D2, the anode of a diode D4, the cathode of a diode D8 and the source electrode of a switching tube Q2, and the connection node forms anend point d. The source of the switching tube Q2 is connected with the drain of the switching tube Q1, and the connection node forms an end point n. The cathode of the diode D7 is connected with oneend of the capacitor C1, and a connection node forms an end point p. The negative electrode of the capacitor C2 is connected with the anode of the diode D8 and the connection node forms an end point m. And the endpoint a, the endpoint c, the endpoint d and the endpoint n form four ports of the hybrid H-bridge network structure. The circuit structure has the advantages of low cost, high reliability, simple control system design and the like.

The invention discloses a DG (Distribution Generation) optimized configuration method taking into account operation risk cost of a power distribution network. The method includes steps of S1, constructing a power distribution network operation risk cost model in a DG grid connected mode; S2, constructing an operation risk cost model in a DG off-grid operation mode; S3, constructing target functions and constraint conditions of power distribution network operation risk cost according to the S1 and the S2; S4, solving S3 by adopting an improved particle swarm optimization and obtaining particles, which correspond to a configuration scheme, with the optimal adaptive value change rate. According to the invention, the DG optimized configuration model taking into account the operation risk costof the power distribution network is established; and risk costs in DC grid-connected operation and off-grid operation are taken as the target functions and DG access capacity, active power balance, no threshold crossing of node voltage, no overload of lines and no threshold crossing of reverse load flows and the like are taken as the constraint conditions in the DG multi-target optimized configuration model, and a Pareto multi-attribute decision method is adopted for processing the constructed multi-target model, so that DG optimized configuration is achieved.

A monitor method of engine performance is to analyze the raising amplitude of rotating speed of each engine cylinder to decide working performance of the engine. This invention adopts ns-grade gethering and processing circuit with very high gethering accuracy to identify the rotation speed difference among teeth of the engine flywheel and by analyzing amplitude of speed wave pulse of each cylinder in operation to know the working performance of the cylinder and uniform working of each cylinder. The device comprises a rotation speed transducer the output of which is connected with a signal gethering treatment circuit connected with a computer process circuit.

The invention discloses a main-standby power supply circuit and storage power supply equipment. The main-standby power supply circuit comprises a voltage stabilization buffer circuit, a PSU anti-backflow control circuit, a BBU anti-backflow control circuit and an overcurrent protection circuit. The voltage stabilization buffer circuit carries out voltage stabilization and voltage buffer processingon a power supply signal output by the PSU; when the PSU/BBU loses power, the PSU/BBU anti-backflow control circuit prevents a PSU/BBU power supply rear-end current from flowing back into the power supply line of the PSU/BBU; the over-current protection circuit detects a current signal input to an electric load and judges whether the current signal is greater than a preset over-current thresholdvalue or not, and if so, a load power supply line is cut off; and if not, the load power supply line is kept to be connected. Therefore, the main-standby power supply circuit is simple in overall design, and the voltage stabilization buffer circuit, the PSU anti-backflow control circuit, the BBU anti-backflow control circuit and the overcurrent protection circuit are all constructed by discrete devices so that cost is relatively low, and a fault loss is relatively small.

The invention relates to a power supply and consumption energy efficiency monitoring and fault liability recognition method and system for a green industrial park. The method includes that an electricenergy data acquisition terminal performs real-time data acquisition and storage on electric energy of each power consumer and each power grid electric energy supply point in the green industrial park; after data processing of the real-time data acquired by the data acquisition terminal, the data are uploaded to a power supply and consumption energy efficiency monitoring and fault liability recognition analysis platform through a communication network; the analysis platform subjects the uploaded electric energy data and other energy consumption data to data processing, data mining and data analysis according to application demands. The system comprises a data acquisition terminal, a data communication unit, a data server, a power supply and consumption energy efficiency monitoring and fault liability recognition analysis workstation and a man-machine interaction unit. On the basis of real-time data acquisition of a power supply and consumption system, online monitoring and analysis ofelectrical operating parameters, electric energy quality and energy efficiency, fault alarming, fault diagnosis and fault liability recognition are realized through big data mining.

The invention relates to an intelligent-protection-type dry-type air-core reactor which comprises a dry-type air-core reactor, a temperature sensor, a voltage transformer, a current transformer, a signal collecting device, an electromagnetic induction power supply and a protection control device, wherein the temperature sensor collects the partial temperature signal enveloped by the coil of the air-core reactor; the voltage transformer collects the voltage variation signal enveloped by the coil of a dry-type air-core reactor; the current transformer collects the current variation signal enveloped by the dry-type air-core reactor; the signal collecting device receives various real-time signals transmitted by a sensor, and converts each signal into the preset formatted data, and transmits the preset formatted data to the protection control device; and the protection control device receives the real-time data sent by the signal collecting device, and outputs corresponding control signals to a vacuum circuit breaker and a fan when the critical parameter value is achieved. The intelligent-protection-type dry-type air-core reactor provided by the invention can complete the monitoring of the own operation state in operation. The invention also comprises the control method of the dry-type air-core reactor.

The invention discloses an electric power high-voltage cable connector non-contact infrared temperature measurement system and an electric power high-voltage cable connector non-contact infrared temperature measurement method. The electric power high-voltage cable connector non-contact infrared temperature measurement system comprises a non-contact infrared temperature measurement device and a non-contact infrared temperature measurement probe. The non-contact infrared temperature measurement device comprises an embedded processing unit, a carrier communication module, a data storage unit, a super-capacitor power pack and an SDI communication module. The embedded processing unit is respectively connected with the carrier communication module, the data storage unit, the super-capacitor power pack and the SDI communication module. The non-contact infrared temperature measurement device is connected with the non-contact infrared temperature measurement probe through the SDI communication module, and therefore acquisition of temperature data is achieved. Through measurement, monitoring and statistic analysis of non-contact temperature of a branch box or a switch cabinet or a high-voltage contact, operating staff can comprehensively master operating conditions of the branch box or the switch cabinet or the high-voltage contact, the electric power high-voltage cable connector non-contact infrared temperature measurement system gives out alerting signals to warn relevant people to conduct emergency treatment when temperature rises sharply and reaches ultimate temperature, and therefore occurrence of failures is avoided or reduced.

The invention discloses a power cable temperature measuring device. The power cable temperature measuring device comprises an embedded processing unit, a temperature measuring sensor unit, a data receiving and processing unit, a communication module, a display module, a storage unit, an alarm device and a supercapacitor power supply group; data measured by the temperature measuring sensor unit arefed into the data receiving and processing unit through the communication module to process; the data receiving and processing unit feeds the processed data into the embedded type processing unit; when monitoring that the temperature is abnormal, the embedded type processing unit sends out alarm information to the alarm device and stores failure information into the storage unit; and the displaymodule is a projection type capacitive touch screen, can display a monitored cable joint temperature value and a processing result, and can set the temperature monitoring condition through a screen menu and inquire historic record. The invention also provides a temperature measuring method of the power cable temperature measuring device. The power cable temperature measuring device and the temperature measuring method have the beneficial effects of high reliability, full functions and capabilities of effectively reducing failure occurrence times and reducing failure loss.

The related circuit unit of LED lamp assembly comprises: a LED branch with one LED or at least serial two LED's, and a voltage-stabilizing branch with one or at least serial voltage stabilizing diodes. Wherein, it parallels former branches. The composite serial LED lamp circuit comprises at least two of former LED lamp assembly circuit units. Compared with current lighting circuit, this invention improves reliability and maintenance, reduces structure complexity and cost, and overcomes the technical problem applying serial LED load in LED lighting circuit.

The invention aims to overcome the defects in the prior art, and provides a parallel operation and load switching control method of a 10kV generator set. According to the method, automation and intelligentization of parallel operation and load switching control are achieved through reasonable and accurate setting of a logical relationship, and accordingly a parallel operation system of the generator set accords with security characteristics of a communication network. Parallel operation and load switching management is achieved through a PLC, and the method mainly comprises control of the parallel operation system and control of load switching. In application of set parallel operation and the load switching management, the PLC achieves related functions ultimately by means of control over various breakers through collection of analog quantity and the switching value via logic setting of a user.

The application discloses a method and system for early warning of failures of an air compressor applied to chip production, as well as a relative device. The method comprises the following steps of obtaining historical observation vectors of the air compressor, wherein the historical observation vectors comprises monitoring data of various variables; separating the historical observation vectorsinto a first historical observation vector and a second historical observation vector, establishing a failure early warning model through the first historical observation vector, and determining failure early warning thresholds according to the failure early warning model and the second historical observation vector; obtaining actual observation vector of the air compressor; judging whether the failure early warning condition is met or not through the failure early warning model and the failure early warning thresholds; and if yes, generating an early warning signal. According to the method disclosed by the invention, when the situation that the actual observation vector meets the early warning condition is judged, the failure early warning signal is generated, so that in-site workers areenabled to find early-stage omens of the failure of the air compressor in advance, and adopt right measures to reduce the damages of the failure, so that the safety and economic efficiency of the starting production course are greatly improved.

The invention provides a single-phase power factor correction circuit based on three-tube five-level topology. The circuit comprises switching tubes Q1, Q2 and Q3, one side of an AC power supply is connected with the anode of a diode D1 and the cathode of a diode D2, and the connection nodes form an end point b; the other side of the AC power supply AC is connected with one end of an inductor L, and the other end of the inductor L is connected with the anode of a diode D3 and the cathode of a diode D4 and the connection nodes form an end point a; the cathode of the diode D7 is connected with one end of a capacitor C1, and the connection node forms an end point p; the other end of the capacitor C1 is connected with one end of a capacitor C2, and the connection node forms an end point n; theother end of the capacitor C2 is connected with the anode of the diode D8, and the connection node forms an end point m; the drain electrode of the switching tube Q1 is connected with the cathode ofthe diode D1 and the anode of the diode D7 respectively, and the connection node forms an end point c; the source electrode of the switching tube Q3 is connected with the anode of the diode D2 and thecathode of the diode D8, and the connection node forms an end point d. The end point a, the end point c, the end point d and the end point n form four symmetrical ports. The correction circuit adoptsmultiple levels so as to have the advantage that the voltage stress of the switching tube is low.

The invention discloses an online monitoring device and method for the insulation characteristic of a cable head. The device comprises a receiving terminal and a temperature measuring module communicatively connected with the receiving terminal. The receiving terminal includes a microprocessor connected with an ambient temperature detecting module. The microprocessor collects the temperature of the outer surface of the cable head in real time through the temperature measuring module, calculates a temperature rise of the cable head, and carries out insulation characteristic determination of thecable head by combining the ambient temperature outputted by the ambient temperature detecting module and a predetermined insulating characteristic. According to the invention, the surface temperature of the cable joint is collected in real time and the insulation property of the cable head is evaluated according to the temperature rise of the cable head surface, the ambient temperature and the predetermined insulation characteristic, so that the potential safety hazard can be discovered timely and accurately and thus the fault losses are reduced.

The invention discloses an online monitoring and combined protection system for a reducing and sizing mill. The online monitoring and combined protection system for the reducing and sizing mill comprises a vibration online detection and analysis module and a temperature online detection and analysis module. The vibration online detection and analysis module establishes a transmission model according to an equipment input rotating speed and speed-ratio information of all transmission stages of the mill so as to monitor vibration amplitude changes at all frequencies, and the system gives out a stopping command when the vibration amplitude at a certain frequency is abnormal. The temperature online detection and analysis module monitors temperature conditions at all oil film bearing positions,establishes a corresponding associated data model according to data steady-state information of bearings, oil supply, oil return temperature and equipment loads, and gives out a warning and automaticstopping command and displays the high-temperature position when the temperature rise rate is high or exceeds a set value. Data from the vibration online detection and analysis module and data from the temperature online detection and analysis module are processed in combination, and independent or inaccurate temperature or vibration measurement data caused by equipment load changes are filteredout. By adoption of the online monitoring and combined protection system, the accuracy of a system detection alarm signal or a stopping signal given out by the system can be improved.

The invention relates to a metallurgical auxiliary material product, in particular to metallurgical auxiliary material core-wrapped blocks and a production device thereof, and belongs to molten iron alloy treatment. The core-wrapped blocks are characterized by being composed of core materials, flexible wrapping films and rigid wrapping covers; press-fit edges are arranged at the two ends, and the core-wrapped blocks are in a lump shape; the diameter ranges from 60 mm to 350 mm; the grain size of the core materials is smaller than 50 mm; the vacuum degree of flexibly-wrapped blocks is smaller than or equal to 200 pa. The production device is formed by connecting a feeding belt, a feeding device, a block mold, a mold conveying chain belt, a vacuum flexible wrapping device, a flexibly-wrapped block conveying device, a rigid wrapping device and a finished product conveying belt. Metallurgical auxiliary materials are conveyed to a feeding bin through the feeding belt, pushed by a feeding screw to be fed, charged into the mold and packaged into the flexibly-wrapped blocks in a flexible wrapping mode in a vacuum chamber; the rigid wrapping device wrap performs roll wrapping, press fit and cutting so that the core-wrapped blocks can be formed. The core-wrapped blocks have the advantages of being novel in concept, small in superficial area, good in sealing performance and metallurgical function, convenient to transport, store and use and high in recovery rate, lowering loss and reducing environmental pollution. The production device is compact in structure, reasonable in arrangement, convenient to operate and high in finished product yield.

The invention belongs to the power transmission and distribution network intelligent technical field in a smart grid and discloses an automatic lightning strike information lightning arrester for a power transmission and distribution network. The lightning arrester is composed of a lightning arrester body part 1 and a lightning arrester information part 2. According to the automatic lightning strike information lightning arrester for the power transmission and distribution network of the invention, a current sensor 31 acquires current signals; the current signals are connected to an information main processor 20 of the lightning arrester through a current processor 32 of the lightning arrester; when it is judged that warning is required to be performed, a communication processor 21 is activated to transmit signals to a power transmission and distribution management center; a power source acquisition circuit 22 obtains a power source from lightning strike; and the automatic lightning strike information lightning arrester arranges lightning strike address information in lightning strike warning information frames, so that a person in charge of the management of the transmission and distribution network can clearly know the location of a current network fault and can be facilitated to timely organize maintenance processing.