66results about How to "Avoid the spread of accidents" patented technology

The invention, which relates to the technical field of circuit protection, provides a single-phase ground fault diagnosis method on various conditions of a cable, an overhead line, and a parallel-serial line. The method comprises: step a, an opening delta zero-sequence voltage at a PT secondary side is monitored; step b, whether a zero-sequence voltage occurs is determined; step c, whether the frequency of the zero-sequence voltage is a power frequency is determined; is not, a signal is sent out to respond to a moving element of a resonance elimination device; step d, three-phase voltage monitoring data are read; if voltage of one phase or voltages of two phases is / are normal-phase voltages and the voltages of other phases are zero, a PT primary side line-breaking fault is determined; step e, a single-phase ground switch that can be turned on or off normally can be put between a neutral point of the PT and the ground, so that a grounding switch trips and is closed rapidly; and step f, whether the opening delta voltage exists is determined; if so, a single-phase ground fault is determined; and if not, fundamental-frequency ferromagnetic resonance is determined. According to the multi-parameter rapid switch fault determination method, the method can be realized simply and reliably; and a fault loop can be disconnected rapidly by using a quick switch, so that accident extending can be avoided.

The invention discloses a split blowout on-load tap changer for a transformer. The split blowout on-load tap changer comprises a tap selector and a diverter switch; the diverter switch comprises a power circuit, a control circuit and a control power supply; the tap selector realizes selection of the number of winding turns of the transformer, and a moving contact of the tap selector is connected with one fixed contact of the power circuit; each fixed contact of the power circuit is connected with a direct contact and a bilateral switch branch; the bilateral switch branch is formed by connecting two electronic power switches, then parallelly connecting the two connected electronic power switches with a buffer circuit and finally serially connecting the three with a fuse; buffer circuits are parallelly connected among the fixed contacts of the power circuit; the control circuit comprises a communication unit, a trigger unit and a detection unit; on and off of the bilateral switch branch are controlled according to data detected by the detection unit. Blowout switching of the split blowout on-load tap changer is realized, expansion of accidents caused by faults of a bilateral switch is prevented, devices are protected from damages, and the split blowout on-load tap changer is simple in structure and reliable in operation.

The invention discloses a fireproof and leakproof system for a high-temperature centrifugal pump, and belongs to the field of chemical equipment. The fireproof and leakproof system comprises a pump body, a non-driving-end bearing housing, a driving-end bearing housing and a shaft, the non-driving-end bearing housing and the driving-end bearing housing are of sealed structures and are fixed onto the pump body, a bearing is positioned in a sealed cavity of each bearing housing, the shaft penetrates through the bearings and the pump body and is fittingly fixed, a gas inlet and a condensate drain opening are disposed on each bearing housing, each gas inlet is connected with a gas pipeline, a gas inlet valve is disposed on each gas pipeline, the gas pipelines are connected with a gas delivery pipe, and a condensate drain valve is arranged on each condensate drain opening. The gas delivery pipe is connected with a gas supply device. Each bearing housing is provided with a pressure monitoring device. Opening and closing of each condensate drain valve are adjusted by a remote control device. The bearing housings at two ends of the pump are of the sealed structures after change, the fireproof and leakproof system is provided with vapor seals or gas seals, when seal leakage occurs, water vapor or nitrogen is filled into the pump via a control system, oil gas leakage is stopped, and fire accidents are prevented. Furthermore, combustion can be reduced by the aid of blowing and diluting effects of the water vapor or the nitrogen, fire is quickly extinguished, and accordingly loss is reduced.

The invention relates to a warning system for wheel disengagement of a sintering circle-cooling machine. The warning system for wheel disengagement of the sintering circle-cooling machine comprises an optoelectronic switch, a pull switch and an infrared camera, wherein the optoelectronic switch, the pull switch and the infrared camera are located beside the circle-cooling machine. The optoelectronic switch is connected with the pull switch and a programmable logic controller (PLC) module. The PLC module is used for writing a corresponding program according to signals sent by the optoelectronic switch and the pull switch and sending the signals to a computer and a broadcast in a center-control operating room for computer picture warning and broadcast voice warning. The infrared camera is connected with a television monitoring system, and the signals are transmitted to a television through the television monitoring system to be displayed in the form of television images. By the adoption of the warning system, people can be warned of the fault of wheel disengagement of the circle-cooling machine in time, center control operators are reminded to check through the television monitoring system, and accidents are prevented from being further worsened.

The invention provides an automatic integrated processing method for a single-phase earth fault, and belongs to the field of emergency protective devices. The automatic integrated processing method for the single-phase earth fault comprises the steps: S1, a controllable electric reactor and a small resistor are arranged on a earth connection return circuit of a converting station, the controllable electric reactor outputs a compensating current when a power distribution network has an earth fault; S2, lasting time of the single-phase earth fault is measured and recorded; S3, the single-phase earth fault is confirmed to be instant grounding when the lasting time of the single-phase earth fault is shorter than preset time; S4, the single-phase earth fault is confirmed to be permanent grounding when the lasting time of the single-phase earth fault is longer than the preset time; and S5, a first treatment measure and a second treatment measure are conducted to the instant grounding and the permanent grounding respectively. Therefore, the permanent earth fault is isolated quickly and accurately, expansion of an accident caused by the fact that overvoltage of power frequency of a system exists for long time is avoided, instant earth fault is compensated accurately and disappears automatically, tripping operation is not needed, and the safety and reliability of the system are improved. Further, the automatic one-in-all processing method for the single-phase earth fault can be widely used in the field of converting station system protection.

The invention provides a compressor piston automatic production line monitoring system which is characterized by comprising a central processor. The input end of the central processor is connected with a human-computer interface, an information acquisition module, a remote operation terminal, a monitoring module and a safety module. The output end of the central processor is connected with a display module, a storage module, an alarm device and a wireless emitter. The information acquisition module is used for acquiring displacement sensor information, angle sensor information, operation parameters of all the machine tool equipment, all levels of product parameter information and principle parameter information of the overall production line. According to the monitoring system, the compressor piston automatic production line can be monitored in real time, and information acquisition of the lathe machining situation, the production situation, the maintenance situation, the shutdown fault situation and the on-duty situation can be completed so that integrated analysis is facilitated and control and operation of the production line can be optimized.

The invention discloses a method for discriminating ineffective protection tail current based on DC component blocking. The method uses proportion of DC component in a phase current to determine an ineffective tail current. The method is easy to operate, has high efficiency, greatly reduces the time of a replay protection apparatus in discriminating the ineffective tail current, and effectively increases accuracy in discriminating the ineffective tail current. The method makes it possible that when a fault current occurs, the ineffective protection does not refuse initiation, and when a CT tail current occurs, the ineffective protection is not wrongfully initiated, and the method accelerates phase-splitting and ineffective protection, prevents enlargement of an accident, and provides better safeguard for safe and stable operation of a power grid.

The invention relates to an automatic dismounting type power battery box system. The automatic dismounting type power battery box system comprises a base and a battery box. The automatic dismounting type power battery box system adopts a vehicle-mounted power source to realize installation and separation of the battery box, and rapid guidance and graded positioning of the vehicle-mounted battery box; the uniformity of light and convenient guidance and accurate positioning is realized; the base and a vehicle body adopt a suspension mechanism connected with an elastic part; in an absorption process of the battery box, a lock tongue of a locking device is popped out under the action of a locking spring and the battery box is automatically locked; when the battery box has safety failures or isdismounted, an unlocking triggering device of an unlocking device is triggered, and the battery box and the base and a connector socket and a plug are rapidly separated through a separation spring; the battery box is smoothly released from the vehicle body and the safety hidden safety dangers hazards are eliminated; accidents are prevented from being further expanded.

The invention relates to a current transformer disconnection identification method, differential protection method and device for an electric reactor. The current transformer disconnection identification method includes judging whether current transformer disconnection judgment start conditions are met or not; if the starting conditions are met, judging whether the following conditions, including(1) the zero sequence current of a home terminal of the electric reactor is not zero and either phase of phase current is zero after disconnection judgment is started; (2) the zero sequence current ofthe other end of the electric reactor is zero and three phases of phase current are all not zero when the disconnection judgment is started; (3) the zero sequence current of the head end of the electric reactor is zero when the disconnection judgment is started, are met or not; determining disconnection of the current transformer for the electric reactor after a set delay time if the above conditions are met. According to the invention, whether disconnection of the current transformer occurs or not is identified according to disconnection and failure features of the current transformer. Besides, the head end voltage of the electric reactor is introduced for auxiliary judgment. Therefore, the disconnection of the current transformer can be judged accurately for the electric reactor and basis is provided for reliable action of differential protection.

The invention discloses a temporary blocking device for shield tunnel water permeable accident rescuing. The device comprises a water blocking air bag and a high-strength drag net, the water blockingair bag comprises an inner container and an outer bag, an inner container protecting layer wraps the inner container, the outer bag wraps the inner container protecting layer, and a layer of high-strength steel wire net wraps the outer bag; an anchoring flange plate is arranged at one end of the inner container, a protecting layer reserved hole matched with the anchoring flange plate is formed inthe inner container protecting layer, and an outer bag reserved hole matched with the anchoring flange plate is formed in the outer bag; a tunnel with a water permeable accident can be rapidly blocked, and the accident is prevented from being expanded further; rescuing facilities are portable, the device is high in adaptability for the poor rescuing environment, a worker can carry the device in place, the facilities can be recycled, and the cost is low; the facilities are high in safety, no ejection or other disaster consequences are caused, and the safety of rescue workers is high; after rescuing is finished, later processing is simple, and no large amount of explosion work is needed.

The invention provides a micro-leakage detector, a system with the same and a detection method of the detector. A micro-leakage detector and a valve leakage detecting fault preprocessing device are arranged on storage equipment; the input end of the valve leakage detecting preprocessing device is connected with the output end of a first button and is respectively connected with an air inlet air pressure sensor and an air outlet air pressure sensor; the output end of the valve leakage detecting preprocessing device is respectively connected with an inlet cutoff valve and an outlet cutoff valve; the input end of the micro-leakage detector is connected with the output end of a second button and is connected with an air pressure sensor for the storage equipment; the output end of the micro-leakage detector is respectively connected with the inlet cutoff valve and the outlet cutoff valve. According to the micro-leakage detector, the system with the same and the detection method of the detector, equipment leakage can be effectively found as soon as possible to avoid accident expanding, and non-permanent non-damaging temporary leaking hidden safety loopholes can be automatically processed in advance, so the manual workload can be reduced.

The invention discloses a fault self-adaptive ground connecting processing system and method for a distribution network power grid. The distribution network power grid comprises a bus. The grounding processing system comprises a grounding transformer, a small resistor putting system, arc extinction complete equipment and a main control system, wherein the arc extinction complete equipment is connected with the bus through the grounding transformer, the small resistor putting system comprises a small resistor and a high-voltage contactor, one end of the small resistor is grounded, the other end of the small resistor is connected with the high-voltage contactor, the high-voltage contactor is connected with the grounding transformer, and the main control system is used for controlling the arc extinction complete equipment and the high-voltage contactor. The embodiment of the invention further discloses a fault self-adaptive ground connecting processing method for the distribution network power grid. By means of the fault self-adaptive ground connecting processing system and method for the distribution network power grid, instant grounding and permanent grounding faults can be intelligently distinguished, frequent trips caused by instant grounding faults are prevented, a circuit with permanent grounding faults can be isolated rapidly and accurately, and stable power supply of the power grid is guaranteed.

The invention discloses a transformer integrated arc-free load-equipped tap switch. The transformer integrated arc-free load-equipped tap switch comprises a fixed contact connected with a transformer tapping, a moving contact D1 connected with a transformer outlet terminal and driven by a motor, and a controlling circuit, wherein the moving contact D1 comprises a first bilateral switch branch of which one end is connected with the outlet terminal, a direct connection contact terminal and a second bilateral switch branch; both of the first switch branch and the second bilateral switch branch are formed by adopting the structure that two power electronic switches are connected in a combined manner, then, a cushion circuits is connected with the two power electronic switches in parallel, and a fuse is connected in series. The bilateral switches and sequential control on triggering of the bilateral switches are adopted to realize arc-free switching of load-equipped tap switches, an accident during failure of the bilateral switches is prevented, reliable power supply is ensured for the controlling circuit, and the transformer integrated arc-free load-equipped tap switch is simple in structure and reliable in working.

The invention provides a method for judging and handling steel channeling on the junction surface of a submerged nozzle. The method comprises the following steps of: turning down the argon flow according to the overturning condition of the liquid level of molten steel, detecting a submerged nozzle part under the liquid level by using a stick if the overturning variation of the liquid level is unremarkable, and judging that an air sucking phenomenon exists at a junction surface of the submerged nozzle and a down nozzle if no remarkable crack exists on the upper part of the liquid level; when steel channeling appears on the junction surface, decelerating immediately, turning down the argon flow, communicating an argon tube, and cooling the junction surface at high argon flow; closely watching the opening state of a sliding plate, and appropriately adjusting the argon flow; and recovering the argon flow at an upper nozzle simultaneously, and pulling steel at a low speed till casting is finished. Due to the adoption of the method, the problem of steel channeling on the junction surface can be discovered and handled as early as possible, casting stop accidents caused by steel channeling are avoided, heat recovery and cold recovery of the molten steel are reduced, the accident loss is lowered, and successful performance of production is ensured.

The invention relates to a directional current based shutting method of a high-speed switching device of an industrial enterprise power supply, which is characterized in that a current amplitude is increased when a working bus and equipment of the working bus generate unsymmetrical faults or symmetrical fault symmetrical faults so as to obtain a fault current identification criterion, a criterion of directional current of a busbar incoming switch, which flows to the working bus, and a criterion of the working bus generating high negative sequence voltage or low working bus voltage; and a shutting logic is formed by identifying whether the faults are generated on the working bus and the load of the working bus. The invention forms the effective and reliable shutting method by optimally combining relative independent data and puts an emphasis on identifying the faults generated on the working bus positioned at the lower switching side of the industrial enterprise power supply and the loading equipment; in addition, under the fault condition, if the switching of the industrial enterprise power supply is falsely operated, a standby power supply can be arranged in the faults to aggravate accidents, thus the shutting method can effectively shut the switching under the condition of the faults through reasonably arrangement and ensure the safety.

The invention provides a system for a rapid short-circuit protection system for a direct current bus of an energy storage converter. Compared with a conventional short circuit protection structure based on a breaker or a fuse, the rapid short-circuit protection system for the direct current bus of the energy storage converter is based on a rapid cutoff capability of an IGBT (Insulated Gate Bipolar Translator), a power supply circuit can be cut off in hundreds of microseconds, and the safety of an energy storage battery and the energy storage converter is protected. According to the system, functions of all modules can be positioned clearly, the structure is compact, the installation and the debugging are facilitated, the response time of protection action is remarkably shortened, and the reliability of an energy storage converter system is improved.

The invention provides a water supply equipment trouble intelligent linkage alarm control system, which comprises an equipment unit, a trouble detection device, an intelligent alarm control terminal,an alarm system and a control system, wherein the trouble detection device is respectively connected with a equipment unit and an intelligent alarm control terminal; the utility model has the following characteristics: the intelligent alarm control terminal comprises a central processor, and the intelligent alarm control terminal is respectively connected with an alarm system and a control system,the control system comprises a protection module, a display module and a power supply module, the protection module, the display module and the power supply module being connected to the central processing unit through a data bus, while the protection module is being further connected to the equipment unit; the alarm system includes an alarm module and a network communication module; the above mechnism can effectively transmit the equipment failure signal to the personnel on-duty, thereby reducing the risk of further deterioration of equipment failures, further reducing cost damage and personnel injuries.

The invention provides a special detecting machine for an automobile circuit breaker and relates to the technical field of automobile detection. The special detecting machine for the automobile circuit breaker solves the problem that currently, when a system goes wrong, because the automobile current breaker is invalid, fault current cannot be cut off effectively and further the accident is expanded. The special detecting machine for the automobile circuit breaker comprises a current sensor, a singlechip control unit and a computer data processing system, wherein a current output end of the current sensor is connected with a data input end of the singlechip control unit; and a data output end of the singlechip control unit is connected with a data input end of the computer data processing system. The special detecting machine for the automobile circuit breaker is suitable for detection of the automobile circuit breakers.

The invention belongs to the field of running control and discloses a control method for preventing a motor from being switched into a short-circuit fault. The control method includes that by improving a motor control loop and adopting double locking logic of switch quantity and analog quantity, after a spare power source automatic switch fails to lock, the motor can be effectively prevented from being mistakenly switched into the short-circuit fault; the motor can run safely and reliably to meet requirements of industrial and enterprise production under the circumstance that a spare power source power-losing automatic switch is enabled to act normally. The control method is safe, reliable, easy to implement and used for motor running, has a double locking function and can be widely used in the field of running control of the motors.

The invention discloses a liquid circular cooling system and a protection method and device thereof. The method comprises the steps that in the state that power of a cooled device outputs, and a power switch of a pump is closed, the hydraulic value at one preset position point of a liquid circulation pipeline in the liquid circular cooling system is obtained; whether the hydraulic value exceeds the first allowable range or not is judged; and if the hydraulic value exceeds the first allowable range, a shutdown protection instruction is sent. Whether the faults such as blockage or leakage or fracture of the liquid circulation pipeline of the liquid circular cooling system or abnormal running of the pump of the liquid circular cooling system or not is monitored online, and maintenance can be conducted in time after the faults happen.

The invention provides a relay protection device and a method for realizing a quick exit of the relay protection device. An MOSFET is connected in series between two output contacts of a relay to serve as an exit of the relay protection device; when a sudden change of a current is detected, the relay is immediately triggered to act, a half period is delayed to calculate a current Fourier fundamental wave value, and when a current fundamental wave value is greater than a set action value, the MOSFET is controlled to be switched on so that the relay protection device quickly exits; a signal thata sudden change quantity triggers the relay to act is automatically released after being kept for 500ms; and when the current fundamental wave value is smaller than the set action value after a faultis removed, 100ms is delayed to make the MOSFET be disconnected so that a secondary circuit is disconnected, and arc discharge of an auxiliary contact of a circuit breaker is ensured. In the invention, a simple and practical method is used to realize rapid exit of the relay protection device, and has great significance for removing the fault as soon as possible and preventing accident expansion,and the scheme is convenient to realize, reliable in control and high in practicability.

The invention discloses an Internet of Things data monitoring processing method and system based on a television, and the television. The method comprises the steps that a television obtains an imagevideo signal of a monitored object and an environment data signal monitored by a sensor through the Internet of Things; the television respectively analyzes and processes the acquired image video signal and the environment data signal monitored by the sensor, and judges whether the image video signal and / or the environment data signal monitored by the sensor have / has an abnormal condition; and when the image video signal and / or the environment data signal monitored by the sensor have / has an abnormal condition, corresponding reminding is performed. According to the invention, a new function isadded to the television; user related equipment states can be checked at any time through the television; for example, the vehicle state of the user and the charging state of the new energy vehicle can be checked at any time; and the user can interact with his / her own car at any time when enjoying the audio-visual feast, and convenience is provided for the user to use.

An overturn-preventing valve comprises a valve body housing, a switch bracket, a pedestal, a straight handle, a return spring and a hex head plug screw, wherein an upper spigot is arranged in the valve body housing; the switch bracket, steel balls and the pedestal are arranged below the upper spigot in sequence; the pedestal comprises a table board and a table body; the table board is arranged at the junction part between the upper cavity and the lower cavity of the valve body; a groove, an oil through hole, an inclined plane and a flow guide groove are formed in the table board; the table board is connected with the straight handle through the table body; the other end of the straight handle is connected with the hex head plug screw after passing through a lower end cap; the return spring is sleeved with the exteriors of the pedestal and the straight handle in parts between the table board and the lower end cap; when a vehicle overturns, an oil inlet pipe and an oil outlet pipe are switched off synchronously through the overturn-preventing valve and a one-way valve; the vehicle returns manually through the pedestal, the straight handle and the return spring. According to the invention, the oil inlet pipeline and the oil outlet pipeline of a fuel oil system can be switched off synchronously to ensure manual return of an overturn oil shut off device, the mounting is convenient, and the safety is higher.

The invention relates to a fireproof drag chain device of a power battery. The fireproof drag chain device comprises an iron chain, fireproof cloth, a left fixed ring and a right fixed ring, wherein the right fixed ring is arranged at the middle part of the iron chain in a penetrating manner; one end of the iron chain passes through the left fixed ring and extends out of a left side extension segment outwards and the other end of the iron chain sequentially passes through the left fixed ring and the right fixed ring and extends out of a right side extension segment outwards; the fireproof cloth is arranged on the iron chain, the left fixed ring and the right fixed ring; and the fireproof cloth, the iron chain, the left fixed ring and the right fixed ring form a fireproof occlusion region. The fireproof drag chain device of the power battery is ingenious in design, reasonable in structure and flexible and convenient to use; by the device, the treatment efficiency can be improved, the treatment effect is ensured, accident diffusion is avoided and the personnel and property safety is ensured; and the fireproof drag chain device is especially suitable for promotion and application in the occasions of an electric vehicle swap station and the like.

The invention belongs to the field of running control of motors and discloses a locking method for preventing a motor from being switched into a short-circuit fault. The locking method includes that by improving a motor control loop and adopting double locking logic of switch quantity and analog quantity, after a spare power source automatic switch fails to lock, the motor can be effectively prevented from being mistakenly switched into the short-circuit fault; under the circumstance that a spare power source power-losing automatic switch normally acts, the motor can run safely, reliably and continuously to meet requirements of industrial and enterprise production. The locking method is a power supply method which is safe, reliable, easy to implement and used for motor running and has a double locking function, and can be widely used in the field of running control of the motors.

The invention relates to an on-line monitoring device and monitoring method for insulation of a wire rod hydroelectric joint of an internal water-cooled generator. According to the technical scheme, a weld joint is arranged between a water box and a water box cover of the hydroelectric joint of the wire rod of the generator, and a gas detection box which is arranged along the weld joint and covers the weld joint is arranged on the outer side of the weld joint; the bottom surface of the gas detection box is in sealed connection with the outer surface of the generator wire rod hydroelectric joint so that an inner cavity of the gas detection box forms a relatively closed tracer gas monitoring space, and the whole section of the weld joint is located in the coverage range of the tracer gas monitoring space; the gas detection box is connected with a three-way valve for charging the tracer gas or for monitoring the internal pressure of the tracer gas monitoring space. According to the present invention, the change of the pressure values on the two sides of the hydroelectric joint is measured, and the content of the characteristic gas of the inner cooling water tank is measured so as to intuitively determine the insulation performance of each hydroelectric joint so that the safety and the reliability are realized; the gas detection box covering the weld joint provides a second defense line for insulation degradation, and internal cooling water is effectively prevented from entering the generator.