94results about How to "Prevent accidents from expanding" patented technology

This invention discloses a method of ammonia liquid storage tank remote monitoring and automatic spraying system. This system can real -time on-line monitor operational conditions of storage tank and provide rapid remote processing if ammonia liquid accidentally leak. The remote photographical monitoring system can monitor the device operating state directly. When ammonia liquid leaking, the remote pneumatic cut-off valve intercepts the storage tank out of the flow quickly. At the same time, the ammonia on-line monitor and automatic spraying system can dilute the ammonia liquid and ammonia into waste liquid, which is then transferred to other working procedure by waste liquid pump. Thus, it effectively decreases ammonia leaking pollution. This invention is safe, simple and low cost.

The invention relates to an early warning type telegraph pole anti-collision barrel which mainly comprises an outer barrel, a base, an inner barrel and an upper cover and further comprises a grading shrinkage rod, a multi-element sensing device, a control device, sound and light alarm devices, a rechargeable battery, a solar charging device and a CT (current transformer) charging device. The outer barrel comprises two sub outer barrels. The base is fixedly connected to the position below the outer barrel and extends outwards. The inner barrel comprises two sub inner barrels. The upper cover comprises two sub upper covers. The grading shrinkage rod is arranged between the outer barrel and the inner barrel. The multi-element sensing device comprises a vibration sensor, an inclination sensor and an ultrasonic ranging sensor. The controller is arranged in a control box. The sound and light alarm devices are evenly distributed on the outer wall of the outer barrel in the circumferential direction. The rechargeable battery is arranged in the control box. The solar charging device and the CT charging device are electrically connected with the rechargeable battery through a charging power source switching unit. By the adoption of the early warning type telegraph pole anti-collision barrel, a telegraph pole is effectively protected and an early warning can be given.

The invention discloses a high-voltage cabinet busbar joint temperature and current monitoring and protecting system which comprises a monitoring unit, a control unit, a fire protection unit, an alarm unit, a base station and a centralized control center. The monitoring unit, the control unit, the base station and the centralized control center are sequentially connected. The monitoring unit comprises a temperature monitoring module and a current monitoring module. The control unit comprises an A/D converter and a single-chip microcomputer. The fire protection unit comprises an automatic fire extinguisher. The control unit is connected with the base station through an RS485. The base station is connected with the centralized control center through a wired optical fiber. According to the system, temperature and current information of a busbar joint in a high-voltage cabinet is monitored, the monitored temperature is compared with normal temperature through the control unit, smog information in the high-voltage cabinet is acquired, urgent repair is conducted when fire breaks out, the information is collected to the centralized control center, the temperature and the current of the high-voltage cabinet busbar joint are remotely monitored on line, power work quality is improved, and the probability and losses of accidents are reduced.

The invention relates to the field of hydraulic transmission, in particular to a hydraulic pipeline leakage online detecting method and a device. The hydraulic pipeline leakage online detecting method and the device are characterized in that an oil input amount of a hydraulic cylinder is metered and an oil input amount of a qualified hydraulic cylinder is used as a benchmark and the difference between the oil input amount and a benchmark value is judged in a real-time mode and used as a basis for hydraulic cylinder leakage. The specific steps are as follows: 1) a flow meter is installed on an oil inlet pipeline of the hydraulic cylinder; 2) the hydraulic cylinder is stretched out all the stroke, and cumulative values a0 of the flow meter are measured and used as the benchmark value; 3) during operation of the hydraulic cylinder, a computer detects cumulative flow a at an arbitrary moment when the hydraulic cylinder is full in stoke in a real time mode and when the difference between a and a0 exceeds the upper limit, the fact that the hydraulic cylinder leaks is determined; and 4) a pressure source is cut off. The upper limit is a0*(0.01 - 0.1). Compared with the prior art, the hydraulic pipeline leakage online detecting method and the device have the advantages that an alarming signal can be emitted in time and the pressure source is cut off, environmental pollution and resource waste caused by loss of oil products are reduced and fire disaster is avoided.

The invention discloses a ferromagnetic resonance online monitoring system for a power distribution network, and the system comprises a system initialization module, a database module, a data communication module, a clustering recognition module, a knowledge base module, and a main control unit. The clustering recognition module carries out the clustering of a certain number of training samples comprising different types of ferromagnetic resonance through calculating the clustering analysis indexes, obtains the ferromagnetic resonance classification indexes, and stores the ferromagnetic resonance classification indexes into the knowledge base module; and then the clustering recognition module calculates the clustering analysis index of an actual sample, and compares the clustering analysis index of the actual sample with the ferromagnetic resonance classification indexes, thereby recognizing the type of ferromagnetic resonance. The invention also discloses a ferromagnetic resonance classification recognition method for the power distribution network. The system carries out the clustering analysis index calculation of the certain number of training samples, carries out the clustering to obtain the ferromagnetic resonance classification indexes, compares the clustering analysis index of the actual sample with the ferromagnetic resonance classification indexes during a fault to recognize the type of ferromagnetic resonance of the actual sample, brings convenience to a power maintainer to timely take corresponding measures for inhibiting the resonance, and prevents an accident from being further expanded.

The invention discloses a longitudinal differential protection synchronization remote test method. The method specially comprises steps: 1, two relay protection testers with time synchronization analog output functions are adopted to be connected onto an M side and an N side of a substation respectively, and the relay protection testers are connected with a GPS receiving device; 2; the two relay protection testers are used for applying current analog to circuit longitudinal differential protection devices, and output current of the two testers has a phase difference of Delta phi=180 DEG; 3, current magnitudes at the M side and the N side and a corresponding phase relationship are displayed via the circuit longitudinal differential protection devices; 4, when differential current on the circuit longitudinal differential protection devices is larger than 100mA, a problem exists in differential protection on two sets of circuit longitudinal differential protection devices and data synchronization performance of sampling circuits of the circuit longitudinal differential protection devices; and 5, the phase difference phi MN of current at two sides of the circuit longitudinal differential protection device is calculated, and when the difference value between phi MN and Delta phi is in a range of +/-1.5 DEG, phase of the circuit longitudinal differential protection device is shown to be correct.

The invention discloses a quick assembly and disassembly type steel pipeline extrusion cut-off device. From bottom to top, the quick assembly and disassembly type steel pipeline extrusion cut-off device is sequentially provided with a base (1), a fixed knife edge (2), a movable knife edge (3), a cross beam (4) and a hydraulic cylinder (5), wherein upright columns (6) are perpendicularly inserted in the left and right sides of the plane on the base (1); the movable knife edge (3) is connected to the upright columns (6) in a sliding mode; the hydraulic cylinder (5) comprises a cylinder cover (7) and a cylinder body (8); a piston (9) is arranged in the cylinder body (8) and fixedly connected to a piston rod (10); and the piston rod (10) is inserted into the central hole of the movable knife edge (3) after penetrating through the cylinder cover (7) and the cross beam (4). The invention provides a hydraulic device which has simple structure and is convenient for quick disassembly and assembly and convenient to carry. The quick assembly and disassembly type steel pipeline extrusion cut-off device can be used for salvaging pipeline bursting accidents in the transportation process of large-diameter pipelines, and performs the function of quickly cutting off the pipeline or weakening the medium flow. The quick assembly and disassembly type steel pipeline extrusion cut-off device is a novel salvage device for long-distance pipelines, and is efficient, practical, safe and reliable.

The invention discloses a large nuclear power station with underground reactor and radioactive auxiliary plant. The large nuclear power station comprises a nuclear island and a conventional island, wherein the nuclear island generates steam by nuclear fission, the conventional island uses the steam generated by the nuclear island to generate electricity, the large nuclear power station is characterized in that the nuclear island is arranged in a underground cavern group excavated in hard rocks by men, the conventional island is on the ground, a passive pool is arranged at the upper part of the cavern group, and a nuclide migration protective system is also arranged outside the cavern group. The large nuclear power station is consistent with the passive concept of the third generation of nuclear power technology, effectively prevents nuclear radiation diffusion in accidents, has the good resistance to shock, prevents tsunami and typhoon from damaging nuclear buildings, has the good safety, and can resist the terrorist attack.

The invention discloses a novel arc suppression coil grounding compensation device with a grounding shunt function, and belongs to the technical field of compensation treatment of a power system on a single-phase ground fault. The novel arc suppression coil grounding compensation device comprises a grounding transformer JDB, an arc suppression coil XL and a grounding switch, wherein the arc suppression coil XL is connected with a neutral point of the grounding transformer JDB and grounded; the grounding switch is connected with various phases of a bus of the power system and grounded; the grounding switch, the grounding transformer JDB and the arc suppression coil XL are arranged in parallel; and the arc suppression coil XL and the grounding switch are connected with an automatic control device capable of detecting bus voltage and grounded capacity current of the power system. The current of a ground fault point can be quickly compensated, shunted and transferred and a ground fault line can be accurately selected, so that safe and stable operation of a power distribution network system and the personal safety are achieved.

The invention relates to a remote fault detection and processing system of a DC power supply screen, which comprises a high-frequency intelligent PLC (Programmable Logic Controller), a background debugging PC (Personal Computer), a PLC communication module and a background communication module, wherein the high-frequency intelligent PLC is connected with the PLC communication module, the background communication module is connected with the background debugging PC, and the PLC communication module is connected with the background communication module. Compared with the prior art, the invention can save manpower and material resources, greatly reduces the maintenance cost of a faulty DC screen, shortens the maintenance time of the faulty DC screen and increases the stable operation reliability of the DC power supply screen.

The invention provides a method for online detecting abnormity of a hydro-generator air cooler. The method comprises the steps of setting a generator stator core normal temperature value, a highest temperature alarm value, an air cooler normal fluid temperature difference and an alarm value; obtaining a temperature value of a generator stator core, water inlet and outlet temperatures of an air cooler, cold air and hot air temperatures, active power, exciting current, a water turbine guide vane opening degree and a generator set working water head; calculating an average value and a temperaturedifference value of each parameter; establishing a mathematical model to obtain the current highest temperature value of the stator core and the current fluid temperature difference of the cooler; calculating the highest temperature of the stator core and the slow variable of the fluid temperature difference of the cooler; and calculating the maximum temperature of the stator core and the first-stage and second-stage alarm prediction values of the fluid temperature difference of the air cooler, detecting that the air cooler of the hydro-generator is abnormal, formulating maintenance and processing plans and measures, and processing the air cooler.

The invention discloses a method for realizing seamless switching between an isolated-network mode and a grid-connected mode in a CCHP (combined cooling, heating and power) system. The method for switching the isolated-network mode into the grid-connected mode comprises the following steps: a synchronizing device is added with a mode switching function; when a CCHP mode controller receives a request instruction for switching the isolated-network mode into the grid-connected mode and a power grid runs in a normal state, the synchronizing device is started to adjust the frequency and voltage of a generator; when the frequency and voltage of the generator meet synchronous connection requirement, and the absolute value of phase difference of the generator and network voltage is smaller than a fixed value 1, an action instruction for switching the isolated-network mode into the grid-connected mode is output; the CCHP mode controller changes from frequency regulation and voltage regulation control to power control; when the frequency and voltage of the generator meet synchronous connection requirement, and the absolute value of phase difference of the generator and network is smaller than a fixed value 2, a generator grid connection instruction is output; and the isolated-network mode is switched into the grid-connected mode. Therefore, the problems of power failure in the switching process and overlarge disturbance and the like of the mode switching process in the CCHP system due to stop of output power of the generator are solved.

The invention discloses an intrinsically-safe direct current system. The input end of the system is connected with two three-phase alternating current power supplies at the same time. The output end of the system is connected with a control bus and a switching bus. The system comprises a number of battery packs in parallel operation. Each battery pack comprises a corresponding charging circuit, a non-isolated feed out circuit and an isolation feed out circuit, wherein each battery pack is connected with the corresponding charging circuit, the non-isolated feed out circuit and the isolation feed out circuit. The output ends of a number of non-isolated feed out circuits which are connected in parallel are connected with the switching bus. The output ends of a number of isolation feed out circuits which are connected in parallel are connected with the control bus. According to the invention, the system has the advantages of high reliability and low cost; investment and maintenance costs of the battery packs are not increased; the problem that a failed battery pack cannot discharge due to outage of a whole substation or outage of a whole power plant can be effectively prevented; and expansion of accidents caused by outage of the whole substation or outage of the whole power plant can be prevented.

The invention discloses a large water delivering and transferring unit preventive control method. The large water delivering and transferring unit preventive control method is characterized by comprising the following steps that firstly, temperature, vibration degree and lubricating oil amount data of a water pump motor and liquid level data of a water inlet pond are collected, the collected dataare sent to a unit control cabinet, and the unit control cabinet sends control signals to the water pump motor, a pump control valve, an overhauling valve and a monitoring instrument; secondly, the unit control cabinet controls running of the water pump motor, the pump control valve, the overhauling valve and the monitoring instrument; thirdly, the unit control cabinet detects unit exterior suddenchange signals and unit interior signal faults; and fourthly, corresponding measures are taken according to the detection result for preventive control. The large water delivering and transferring unit preventive control method solves the problem that in the unit producing and running process, due to exterior technology sudden changes or self faults, sudden shutdown is caused, and damage is caused; and advanced preventive measures are taken for a unit in the production process, automatic detection is timely, and protection measures are taken.

The invention discloses a fast acting fuse-based detection and positioning device and a method thereof. The fast acting fuse-based detection and positioning device comprises a power supply conversion module, a fast acting fuse node signal detection module, a logic processing unit, a fast acting fuse fault alarm and trip signal output module, and a communication module; the input of the power supply conversion module is connected with an external direct-current power supply, and the output of the power supply conversion module is connected with the logic processing unit; the input end of the fast acting fuse node signal detection module is connected with a fast acting fuse node signal; the output end of the node signal detection module is connected with the logic processing unit; the logic processing unit is connected with the fast acting fuse fault alarm and trip signal output module and outputs a fast acting fuse fault alarm or trip signal; and the communication module is connected with the logic processing unit, communicates with the external and transfers fault positioning information. The invention has the advantages that: the fast acting fuse-based detection and positioning device has a simple structure, and can acquire the fast acting fuse node signal in a large-power eliminator supply; and the fast acting fuse fault information can be positioned by communication transmission and the like.

The invention relates to a power generator, transmission line and generator-grid early warning and early control method and a system thereof, a method of accurately calculating and controlling the dynamic reserve power of the power generator or the transmission line and a generator-grid coordination early warning and early control system, which can guide a duty worker in a power plant or a substation to tend to a strong power grid direction to coordinate stable operation of the power generator or the transmission line, and hidden instable operation states are alarmed. The dynamic reserve power of the power generator or the transmission line is calculated in real time, a generator-grid coordination PQ curve range is calculated, the power plant or the substation is guided to be adjusted safely and stably, all automatic stable adjustment devices in a substation are ensured to have enough accident reserve adjustment space and effective hot standby, accurate adjustment can be carried out in a system disturbance state, failure due to lacking of the adjustment space is avoided or protection maloperation or secondary disturbance caused by over adjustment can be avoided; and the real-time high quality and the maximization of the whole accident reserve power of the substation can be ensured, and co-management of a generator-grid coordination safe and stable operation mechanism by the substation and the dispatching can be realized.

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 discloses a system for judging grounding fault and a method for judging grounding fault in a multi-stage power supply network. The multi-stage power supply network is a N-stage power supply network; the system comprises low current line selection devices arranged in a distribution section of each stage of power supply network, a first to a N-th stage low current line selection devices are formed; the system further comprises a grounding line selection logic control device, the first to the N-th stage low current line selection device are respectively and independently connected with the grounding line selection logic control device through optical fibre. According to the judging method, the grounding alarm signal of multi-stage power supply network grounding line selection device is managed uniformly, and then which stage and which circuit has the grounding fault is accurately judged, and the grounding line is directly founded out.

The invention discloses a buffering device for a cogging mill manipulator guide point. The guide point (1) is fixedly arranged on a manipulator (6) through a fixing pin (7); a thin steel plate (2) is welded on the guide point (1); a spring (3) is arranged on the guide point (1); and one end of the spring (3) is fixed on the guide point (1), and the other end of the spring (3) is fixed on the manipulator (6). According to the buffering device, the guide point is fixed thoroughly, so that friction between a guide point safety pin and a pin hole is reduced, and the guide point can be used normally; therefore, steel materials can be input into or output from a rolling slot of a cogging mill precisely; and when the guide point swings a lot and fails, a full-automatic program stops automatically, and rolling is stopped, so that equipment is protected.

The invention discloses a tank car operation platform monitoring and vehicle guiding positioning system and a using method thereof. The system comprises operation platforms, each operation platform is provided with a liftable support, the front end of the support includes an operation device, and the operation platform is provided with an upper sensor, a lower sensor and a stress sensor; and each operation platform is further provided with a central control device, a range finder and an in-place sensor, the central control device is connected with the upper sensor, the lower sensor and the stress sensor, and the range finder and the in-place sensor detect a vehicle. The central control device can send a signal to a display device, platform state and vehicle position guiding information can be displayed on the display device, whether a driver platform can be used, the driving direction of the vehicle and the position of the vehicle relative to the platform are prompted, and the central control device can receive identification information from the vehicle. At the same time, the central control device sends data to a server for monitoring and management. Thus, the entry position of a tank car can be detected, the states of tank car platforms are detected, and central control and management functions are provided.

The invention discloses an electric control device system for a mining elevator and a control method thereof. The electric control device comprises the components of an elevator motor forward-rotation and backward-rotation operation control part, a frequency converter frequency setting part, a working brake control part, a safety brake control part and a double-wire-system control part. Forward rotation control and backward rotation control on the motor are realized through controlling to a frequency converter for performing forward rotation and backward rotation by a programmable logic controller (PLC). Controlling for the operation speed of the motor is finished through setting the frequency of the frequency converter by the PLC. In a normal operation condition, a braking torque is controlled through a braking handle; and safety braking is performed in emergency. The safety braking is divided into two-stage braking control and one-stage brake control. According to the electric control device system, two PLCs are mounted for realizing simultaneous operation. Operation of the elevator can be safely and reliably controlled. Furthermore production efficiency is effectively improved.

The invention relates to a non-disturbance rapid switching simulation test system. The system comprises a switch K1 connected with a 400V bus, a switch K2, a transformer T1, a transformer T2, a transformer T3, a transformer T4, a rapid switch DL1, a rapid switch DL2, a low voltage contactor JCQ2, a low voltage contactor JCQ5, a low voltage reactor L1, a middle voltage reactor L2, a middle voltage breaker DL3, a middle voltage contactor JC1, a power source wire incoming breaker module VFC1 and a power source wire incoming breaker module VFC2, wherein middle and low voltage outgoing wires of the system are led out through the four transformers, a 400V incoming line is divided into two, the voltage is boosted to 10KV through the transformers T1 and T3, two segments of 10KV outgoing wires are simulated, the voltage is reduced to 400V through the transformers T2 and T4, two segments of 400V outgoing wires are simulated, fault simulation is carried out through the middle voltage contactor JC1, the low voltage contactor JCQ2, the middle voltage reactor L2 and the low voltage reactor L1, artificial interphase and relative short circuit is realized, and common operation problems of field loads are simulated.