49results about How to "Avoid fault expansion" patented technology

The invention discloses a distributing net single phase earth fault type and a distinguishing method of phase identification, relating to a distributing net single phase earth fault distinguishing method in the field of AC distributing net testing and relaying protection technology. According to the invention, through collecting three-phase voltage of the distributing net system and neutral point voltage of the distributing net system, phase angle of each eigenvector is computed through a special relation, the type of the fault and the phase identification can be fast distinguished through the phase angle distinguishing logic. The inventive working system is that a three-phase bus (000), a grounding transformer (100), a linear side of an arc suppression coil (200) are connected in turn with the earth; a controller (400), a thyristor (300) and a secondary side of an arc suppression coil (200) are connected in turn. The invention is simple in criterion, small in collection quantity, fast in distinguishing speed, high in accuracy, reliable in security, which is suitable for 3-66 KV distributing net based on an aerial line or a power cable.

The invention discloses a power supply and distribution monitoring system. The power supply and distribution monitoring system comprises an on-site monitoring sub system, a communication network and a monitoring center, wherein the on-site monitoring sub system is used for collecting analog quantities and switching values of on-site voltage-transformation equipment and power distribution equipment adapted with the voltage-transformation equipment, and transmitting the collected data to the monitoring centre through the communication network; and the monitoring center is used for receiving, and storing, making statistics, analyzing and processing the collected various data information, and issuing a control instruction through the communication network. According to the power supply and distribution monitoring system, the management efficiency and the power supply reliability of the system are improved; the required information for lowering electric energy cost, equipment investment cost and potential loss in equipment running is provided; the power supply and distribution monitoring system establishes the complete monitoring system for the voltage-transformation equipment and power distribution equipment by collecting, storing, making statistics, analyzing and processing the electric power parameters; an abnormal phenomenon can be found in time in the real-time monitoring process; and effective measures are adopted for equipment upgrading or compensation so as to avoid malfunction expansion and loss.

The invention discloses a diagnosis method and monitoring method for a turn-to-turn short circuit fault of a double-winding synchronous wind driven generator, and the diagnosis method comprises the following steps: 1), controlling a stator winding to serve as a testing winding when a target generator is in a stationary state, applying a testing voltage to the testing winding through a wind power converter, and enabling the other winding to serve as an induction winding; 2), diagnosing the state of a single-winding turn-to-turn short circuit fault according to the size relation between a three-phase induction voltage of the induction winding and the linear voltage of the testing winding. The monitoring method carries out the turn-to-turn short circuit fault diagnosis according to the above diagnosis method after the self-inspection of the wind power converter and the start of the target generator, and gives a fault alarm if the fault is diagnosed. The method can timely diagnose and monitor an early stator single-winding turn-to-turn short circuit fault of the double-winding wind driven generator, is simple for implementation, does not need auxiliary equipment and complex calculation, and is accurate in diagnosis result.

The invention provides an automatic repair system for power supplies. The automatic repair system is connected between a switching power supply set and a load set. The automatic repair system comprises a voltage sampling circuit, a current sampling circuit, a filtering network, an amplifying circuit, a main control unit, a relay set and a local power supply circuit. The main control unit is connected with a relay drive circuit to compare obtained multi-circuit voltage sampling values and multi-circuit current sampling values with preset threshold values respectively to judge whether the sampling values are abnormal, if the voltage sampling values are abnormal, the switching power supply set is abnormal, and the relay drive circuit is controlled to cut off the switching power supply breaking down, and connect the standby switching power supply; if the current sampling values are abnormal, the load set is abnormal, and the relay drive circuit is controlled to cut off the load power supply breaking down; if the voltage sampling values and the current sampling values are abnormal, the switching power supply breaking down and the load power supply breaking down are cut off, and fault phenomena and processing results are reported to a remote terminal. The automatic repair system is multifunctional and can be applied to automatic repair of the direct-current power supplies.

The invention relates to a detection system and a detection method for alternating-current loops of a wind generation set. The detection method comprises the following steps: a main control system is electrified by controlling a contactor; a controller is used for disconnecting or connecting corresponding micro circuit breakers and contactors of many alternating-current loops of a control system of the wind generation set so as to control the existence of various phase voltage of the corresponding alternating-current loops of the control system of the wind generation set; and whether the voltage of the corresponding loops of the control system of the wind generation set exists or does not exist, whether phase sequences are correct and whether the action condition of a contact is the same as control expectation can be detected by a test system through an optical isolator and the controller, therefore, whether hardware loops, devices and connection wires of the main control system are virtually connected can be detected. The detection system and the detection method disclosed by the invention are capable of automatic judging by adopting the controller and preventing from detecting the certain loops in a missing manner because of artificial faults caused by many loops and high workload; furthermore, the test efficiency and the safety are greatly increased; in addition, because the number of the output alternating-current loops of the main control system of the wind generation set is nearly 100, artificial testing is time-wasting, error detection and missed detection are easily caused, and potential safety hazards also exist.

The invention discloses a gas laser failure detecting system and a detecting method thereof. The gas laser failure detecting system comprises the components of: a laser, a charging power supply which is connected with the laser, a trigger which triggers conduction of the laser, a control module which is connected with the charging power supply and the trigger respectively, and an energy storage capacitor which is connected with the charging power supply. Two ends of the energy storage capacitor are connected with a voltage detecting unit. A current detecting unit is connected between the energy storage capacitor and the laser. The voltage detecting unit and the current detecting unit are respectively connected with the control module. The control module is used for determining failure position through detecting capacitor voltage and current and controlling sequential relationship between the charging power supply and the trigger. The gas laser failure detecting system with the structure and the method have the following advantages: 1. quickly determining failure position, realizing a target of quick maintenance, simultaneously preventing failure enlargement; and 2. realizing high maintenance efficiency and low maintenance cost.

The invention relates to a TFT glass BOD process rapid dynamic weighing system. The system comprises two groups of weighing devices and a plc, wherein one group of weighing devices are arranged at a no-load weighing station and used for measuring the weight of a transport trolley, the other group of weighing devices is arranged at a load weighing station and is used for measuring the weights of the transport trolley and the weighing glass, each group of weighing devices comprises two high-precision measuring scales, and the two high-precision measuring scales jointly complete weight measurement. A TFT glass BOD process rapid dynamic weighing method comprises steps that the weight of the transport trolley is measured firstly, then the weight of the transport trolley and the weight of the weighing glass are measured, and the weight of the weighing glass is obtained by taking a difference value; in the weighing process, a weight change curve of a current weight value of the weighed objectmeasured in real time is drawn, the sampling frequency is calculated by more than 200 milliseconds, previous data with large fluctuation is avoided, and whether weighing is completed is judged according to the data whether weight change curve change is in the stable stage, so the plc can conveniently calculate to obtain accurate weighing data at the first time.

The invention relates to an intelligent water pump fault early warning system. The intelligent water pump fault early warning system comprises a sensor group and a water pump control center which areconnected with each other, and is characterized in that the sensor group comprises a current measurement module, a motor bearing temperature sensor, a motor stator temperature sensor, an IGBT built-intemperature sensor, a pressure sensor and a flow sensor; the current measurement module is used for detecting the running current of a motor, the motor bearing temperature sensor is used for detecting the temperature of a motor bearing, the motor stator temperature sensor is used for detecting the temperature of a motor stator, the IGBT built-in temperature sensor is used for detecting the temperature of the frequency converter IGBT, the pressure sensor is used for detecting the input pressure of a water pump, the flow sensor is used for detecting the flow of the water pump, and the water pump control center compares and analyzes the data acquired by the sensor group with a stored water pump data model, and whether the water pump has a fault foreboding or not is judged. The intelligent water pump fault early warning system can effectively avoid expansion of faults of the water pump.

The invention relates to the technical field of cable temperature monitoring, and in particular to relates to a cable temperature monitoring device. The cable temperature monitoring device comprises a cable, two cable joints disposed at two ends of the cable, an insulation box body, a first signal collecting device, a second signal collecting device, and a control unit. The cable is provided with a first temperature sensor. The two cable joints are respectively provided with a second temperature sensor and a third temperature sensor. One side surface of the insulation box body is provided with two cable joint inserting holes. Two spiral clamping type terminal binding posts are disposed in the insulation box body. The bottom of the spiral clamping type terminal binding post is connected to a conductance sheet, which is respectively and electrically connected to the detection probe of the corresponding second temperature sensor and the third temperature sensor. The invention is advantageous in that through the real-time monitoring of the change of cable temperature, workers in charge of regulation and control and operation can be reminded in time when the cable is at high temperature, and thereby faults can be prevented, and fault enlargement due to cable breakdown can be prevented.

The invention discloses an extra-high voltage multi-terminal hybrid direct-current power transmission system valve group fault exit control method. The method comprises the steps of judging the typesof converter stations where a fault valve group is located in an extra-high voltage multi-terminal hybrid direct-current power transmission system, wherein the types of the converter stations are divided into a sending-end converter station and a receiving-end converter station; judging whether the inter-station communication of the converter stations is normal or not, and if the inter-station communication of the converter stations is interrupted, independently carrying out valve group fault quit control according to the type of the converter station where the fault valve group is located, the sending-end converter station and the receiving-end converter station; otherwise, according to the type of the converter station where the fault valve group is located, allowing the sending-end converter station and the receiving-end converter station to jointly carry out valve group fault quit control. The method is suitable for the multi-terminal hybrid direct-current power transmission control system, the control characteristics of different types of valve groups are combined, the valve groups of all stations are matched with one another, the fault quitting of the valve groups of the multi-terminal hybrid direct-current power transmission system can be rapidly completed, and the shutdown of the whole system caused by faults of a single valve group is avoided.

The invention discloses an internet-based electric power monitoring device. The internet-based electrical power monitoring device comprises an electric leakage detector, a data collection module, a computer, a data processing module and a portable power monitor. A signal output end of the electric leakage detector is electrically connected with a first signal input end of the data collection module, an open-short circuit tester is electrically connected with a second signal input end of the data collection module, a signal output end of the data collection module is in signal connection with asignal input end of the data processing module, a commonly used circuit is electrically connected to a circuit access end of the data processing module, and a branch switch and a main switch are electrically connected to a control end of the data processing module. The internet-based electric power monitoring device has the advantages that a database and a storage module are in signal connectionwith a signal end of the computer, so that the computer can analyze and summarize failure data, upload such failure data to the database and back up such failure data to the storage module; data resources in the database can be shared to improve the ability of relevant professionals to tackle problems.

The invention discloses a warping pressing device and method used in a strip steel rough rolling process and relates to the technical field of steel rolling automatic control. A warping pressing device is mounted above a roller bed and comprises a pressing block, a chain, a steel wire rope, a bracket, a motor, a rope disc and a pulley, wherein the pressing block is connected to one end of the steel wire rope through the chain; the pulley is fixedly mounted on the bracket, and the other end of the steel wire rope penetrates the pulley and is fixedly connected to the rope disc; the rope disc isfixedly mounted on the motor, and the steel wire rope is pulled by the motor, the rope disc and the pulley. The warping height of the strip steel is determined by means of a warping and buckling detection device arranged next to the roller bed, and whether the wrapped strip steel can enter the racks to be rolled or not according to the height of follow-up rack inlet equipment. If the wrapping height exceeds the height of follow-up rack inlet equipment, the strip steel is leveled automatically and rolled subsequently by controlling the wrapping pressing devices arranged above the roller bed between the two racks, so that steel scrap and disorderly close-down are reduced.

The invention relates to a derailment-prevention auxiliary device of a sintering machine trolley. The derailment-prevention auxiliary device comprises a turning lane (1), the trolley (2) and trolley wheels (10), and is characterized in that the device is provided with cross beams (6) through a support; the cross beams (6) are symmetrically mounted on the two sides of the tail turning lane; two press wheels (3) are mounted on the cross beams (6) through press wheel bases (9) and adjusting bolts (5); springs (4) are mounted between the press wheel bases (9) and the cross beams (6), and the pretightening force of the springs (4) is adjusted through the adjusting bolts (5); and the center distance of the two press wheels (3) is equal to that of the trolley wheels (10) of the trolley (2). According to the derailment-prevention auxiliary device, the trolley wheels at the two ends of the trolley just operating from a tail bent rail of a sintering machine are reset, the trolley bulging phenomenon is avoided, derailment of the sintering machine trolley is prevented, and fault expansion is avoided.

The invention discloses a diagnosis method and monitoring method for a turn-to-turn short circuit fault of a double-winding synchronous wind driven generator, and the diagnosis method comprises the following steps: 1), controlling a stator winding to serve as a testing winding when a target generator is in a stationary state, applying a testing voltage to the testing winding through a wind power converter, and enabling the other winding to serve as an induction winding; 2), diagnosing the state of a single-winding turn-to-turn short circuit fault according to the size relation between a three-phase induction voltage of the induction winding and the linear voltage of the testing winding. The monitoring method carries out the turn-to-turn short circuit fault diagnosis according to the above diagnosis method after the self-inspection of the wind power converter and the start of the target generator, and gives a fault alarm if the fault is diagnosed. The method can timely diagnose and monitor an early stator single-winding turn-to-turn short circuit fault of the double-winding wind driven generator, is simple for implementation, does not need auxiliary equipment and complex calculation, and is accurate in diagnosis result.

The invention discloses a rail transit vehicle and an energy storage system and a control method thereof. The energy storage system comprises N energy storage units connected in parallel. The energy storage power supply comprises an energy storage power supply box, wherein the energy storage power supply box comprises n energy storage elements which are connected in series, two ends of a series branch formed by the n energy storage elements which are connected in series are respectively connected with two main contacts of the contactor, and the two main contacts are both connected with a vehicle load; a coil of the contactor is connected with a train control management system; and N is greater than or equal to 1. By adopting the bistable contactor, under the condition of no fault removal, the contactor does not need to be controlled to be closed, and the problem that the contactor cannot be closed due to low electric quantity of a vehicle control storage battery and line voltage drop does not need to be considered.

The invention discloses a split type three-phase three-wire high-voltage electric energy metering box that comprises two single-phase combined transformers; the single-phase combined mutual inductor comprises a power supply end, a load end and a B-phase voltage end which are connected with a high-voltage power grid. The two single-phase combined transformers are independently packaged and can be interchanged; when the two single-phase combined transformers are exchanged, the connection directions of the power supply end, the load end and the B-phase voltage end and leads of the power supply, the load and a B-phase line of the high-voltage power grid are unchanged; the two B-phase voltage ends are still connected with the B-phase line of the high-voltage power grid through the lead betweenthe two single-phase combined transformers; the three-phase three-wire high-voltage electric energy metering box is formed by combining two independently packaged single-phase combined transformer single bodies with the same appearance structure and internal connection, so that electric energy metering is realized, the weight of the mounting single body of the metering box is greatly reduced, andthe mounting is light and convenient.

The invention relates to a power distribution network single-phase earth fault differentiation processing and fault area isolation method, which is characterized in that complete equipment consists ofa dynamic intelligent resistance grounding device, a feeder zero-sequence protection device, a feeder node zero-sequence current sensor, a feeder node intelligent switch and a control system, and processes faults by different delays in event of single-phase earth fault in a power distribution network. According to the invention, when a high-resistance fault occurs, a grounding fault line is selected, and a fault current path is checked for fault area judgment and isolation; and when a low-resistance fault occurs, differentiated fault processing and fault area isolation are realized through cooperation with feeder zero-sequence protection and a node intelligent switch so as to reduce a power failure range.

The invention discloses a fault detection method, device and system for a scraper conveyor. The fault detection method, device and system are used for detecting whether the scraper conveyor breaks down or not in real time. The method comprises the steps that in the operation process of the scraper conveyor, signals fed back by the scraper conveyor are received through at least one sensor arranged above the scraper conveyor; when the signal fed back by the scraper conveyer meets the fault occurrence condition, the scraper conveyer is controlled to stop running; the fault type of the scraper conveyor is determined according to the signals fed back by the scraper conveyor; and sending reminding information for the fault type. By the adoption of the scheme, when the scraper conveyor breaks down, electricity consumption can be saved, and further expansion of the fault is avoided; meanwhile, the fault type can be judged according to the feedback signal, and a fault prompt is sent according to the fault type, so that a worker can conveniently know the fault type in advance, and the fault removal efficiency is improved.

The invention provides a consumable part fault detection method in a plasma arc spray gun. The method is characterized by continuously detecting at least one of the E-pole voltage of an arc-turning IGBT or the voltage of the low-voltage end of a high-voltage arc striking transformer in plasma arc spray gun operation; and determining that a consumable part in the plasma arc spray gun has a fault according to the quantitative density of detection voltages which are suddenly changed within a certain period of time. By using the method, the fault of the consumable part during the plasma arc spraygun operation can be timely detected, a machine can be stopped and a warning is sent out so as to avoid the further enlargement of the fault, production is not stopped because of the scrapping of thespray gun, economic losses are reduced and the decrease of processing quality, which is caused by the excessive loss of the consumable part, can be prevented.

The invention relates to a current-based longitudinal differential protection method and system for a belt conveyor, which are used for protecting the belt conveyor during operation. The method comprises the following steps of periodically collecting the current value of the belt conveyor, and judging whether the belt conveyor is in no-load operation or not, if yes, protecting the belt conveyor through the no-load protection step, and if not, protecting the belt conveyor through the load protection step. Compared with the prior art, the method has the advantages of high accuracy, high reliability, good safety, strong timeliness and the like.

A method for differentiated treatment of single-phase ground faults and fault area isolation in a distribution network. The complete set of devices consists of a dynamic intelligent resistance grounding device, a feeder zero-sequence protection, a feeder node zero-sequence current sensor, a feeder node intelligent switch, and a control system. When a single-phase ground fault occurs in the power grid, the fault is processed through different delays. In the event of a high-resistance fault, the ground fault line is selected, and the fault current path is checked to judge and isolate the fault area. In the case of low-resistance faults, it cooperates with feeder zero-sequence protection and node intelligent switches to achieve differentiated fault handling and fault area isolation to reduce the scope of power outages.

The invention discloses an electromechanical equipment data acquisition and analysis method. A data receiving unit, a data classification unit, a database unit, a data comparison unit, a prompt unit,an authority threshold modification unit, a control unit and an instruction output unit are adopted as application software for analysis. A current acquisition sensor, a voltage acquisition sensor, afrequency acquisition sensor, a rotating speed acquisition sensor, a temperature acquisition sensor, a GPRS module and a single-chip microcomputer module which are provided with RS485 data ports are used as equipment for acquiring working current, working voltage, working frequency, rotating speed data, self temperature data and environment temperature data of electromechanical equipment. Variousdata of the electromechanical equipment can be collected in real time, the collected data are more comprehensive, managers can be prompted in time after abnormal data occur, the managers can set and modify various alarm threshold data according to the specific working state of the electromechanical equipment, and after main data thresholds of the electromechanical equipment exceed the standard, the electromechanical equipment can be controlled to stop working, and fault expansion is prevented.

The invention relates to a dynamic template sending method and device, electronic equipment and a storage medium. The method comprises the following steps: receiving template operation data sent by a first client which has sent a dynamic template, wherein the dynamic template has an acquisition point for acquiring data, and the template operation data is data acquired by the first client through the acquisition point; when abnormal data exists in the template operation data, obtaining the abnormal data; and when the abnormal data meets an abnormal index, sending an adjusting instruction to a template configuration center, wherein the adjusting instruction is used for indicating the template configuration center to reduce the sending number of the dynamic templates. According to the scheme, the running condition of the dynamic template is monitored based on the big data collected in real time, the issuing amount of the dynamic template is reduced when it is judged that the dynamic template has problems, fault expansion can be avoided in time, and the sending quality of the dynamic template is improved.

The invention discloses a buffer loop protection circuit. The method comprises the following steps of considering that a controllable switch in a buffer loop cannot be successfully closed when a faultoccurs; this case, the charging of the energy storage capacitor is completed; when the controllable switch needs to be closed, the voltage detection module detects a relatively high voltage across the two ends of the buffer resistor. When the power-on time reaches the preset time period and the voltage values at the two ends of the buffer loop are higher than the preset threshold value, the prompter is controlled to prompt the controllable switch to fail, so that workers can know and overhaul the controllable switch conveniently, the buffer resistor is prevented from being damaged due to excessive electric energy consumption, and the failure is prevented from being further expanded. The invention further discloses a servo driver which has the same beneficial effects as the buffer loop protection circuit.