41results about How to "Maintain safe operation" patented technology

The invention discloses an MMC converter valve submodule on-line monitoring method and system. The method comprises the steps of: obtaining a switch module trigger signal and operation state electrical quantity parameters of all submodules; calculating operation monitoring parameters of each sub-module according to the switch module trigger signal and the operation state electrical quantity parameters of each sub-module; and according to a preset sub-module operation monitoring parameter threshold, the operation state electrical quantity parameters of each sub-module and the operation monitoring parameters of each sub-module, judging whether the operation of each sub-module is abnormal or not, and obtaining a monitoring result. According to the invention, the measured electrical quantity parameters of the operation states of the sub-modules are analyzed and calculated; and the multi-submodule operation monitoring parameters capable of visually reflecting the operation state of the converter valve submodule are obtained, so that maintenance personnel can conveniently monitor the MMC converter valve submodule at multiple angles, and the safe operation of the converter valve can be more accurately, more conveniently and more effectively maintained.

The invention relates to negative sequence inhibiting device and method for an asynchronous motor under an unbalanced voltage condition. The device is characterized in three phases of a positive/ negative sequence voltage current detecting module are respectively correspondingly connected with three phases at the asynchronous motor; the input side of a negative sequence inhibiting wave generation module is connected to a power grid through a voltage regulator; a power supply module is connected with the power grid. According to the technical scheme, the device has the advantages that the positive and negative sequence components and unbalance factor of the asynchronous motor end of the motor in running are acquired on real time; the microcomputer is used for calculating and processing, a corresponding control instruction is sent to the negative sequence inhibitor to generate voltage waveform for inhibiting the negative sequence component of the asynchronous motor, so as to reduce the adverse influence of the negative sequence component on the asynchronous motor; in addition, when detecting that the voltage unbalance factor of the asynchronous motor end and the stator single-phase maximum current exceed the extreme safety operation range, an alarming signal is sent, a power supply of the asynchronous motor is cut off, and therefore, the safety operation of the asynchronous motor is ensured.

The invention provides an early warning method and equipment for a secondary circuit fault of a relay protection device. The method comprises steps of S1, acquiring recording files of the plurality of interrelated relay protection devices; S2, according to the recording files, if a first relay protection device that is uniquely triggered or only not triggered to start exists in the relay protection devices, determining that the secondary circuit of the first relay protection device is faulty, otherwise, determining that there is no fault. By determining whether there is a relay protection device that is uniquely triggered or only not triggered to start in the plurality of interrelated relay protection devices, it is possible to detect not only the steady-state fault inside the relay protection devices but also to effectively detect the intermittent hidden failure of the secondary circuit and send an early warning signal, so as to facilitate the timely elimination of hidden dangers and to maintain the safe operation of the power system.

The invention discloses a photovoltaic rapid detection and accurate diagnosis method based on maximum power point tracking data. The method comprises the following steps: detecting abnormality based on instantaneous current drop of a maximum power point, and setting a threshold value while considering a sampling interval and a disturbance step length; utilizing the number of key working points andextreme points on a characteristic curve to distinguish occlusion and line faults, and further evaluating a fault degree; and according to a fault evaluation result, setting a working voltage to distinguish a fault string from a normal string so as to realize fault positioning. The detection method provided by the invention does not need to install additional data acquisition equipment, can be conveniently embedded into a commercial inverter, and is suitable for complex environments such as low irradiance, a low mismatch level and installation of blocking diodes, and meanwhile, extracted inflection point characteristics can effectively distinguish partial occlusion and line faults with similar characteristics, and unnecessary power-off protection is avoided. In addition, a fault positioning method provided by the invention can be used for quickly isolating the fault so that the safe operation of the system is ensured.

The invention provides a detection device for testing the working state of a substation SF6 sensor. The detection device comprises a gas storage mechanism for storing an SF6 gas and an SF6 sensor detection mechanism; a detection gas hood is provided with a gas inlet, the gas storage mechanism is provided a gas outlet, the gas outlet is provided with a control valve for controlling the output of the SF6 gas in the gas storage mechanism, and the output end of the control valve is connected with the gas inlet of the detection gas hood through a conduit; a test plate is arranged in the gas hood ofthe detection gas hood, and a display screen and a handle are arranged on the external surface of the detection gas hood; the display screen and the SF6 sensing tester are respectively connected withthe controller; and the controller obtains the concentration information of the SF6 gas in the gas hood through the SF6 sensing tester and displays the obtained concentration information on the display. The detection device for detecting the substation SF6 sensor has the advantages of shortening of the detection time, increase of the working efficiency, ensuring of the safety of personnel, ensuring of the detection accuracy, and maintenance of the safe running of a power grid.

The invention discloses a detection method and system of clone terminal devices, and the detection is performed on the basis of a network consisting of a front-end server and a certain number of terminal devices. The method comprises the following steps that: S1) the front-end server receives access applications of the terminal devices, performs conversation after key agreement and performs the conversation in a way allowed by different key interval agreements if the access applications of the same terminal devices exist; S2) the front-end server records and stores information of each terminal device and behavior information for communicating with the front-end server; and S3) whether the terminal device is cloned or not is judged by combining the information and behavior information of each terminal device. The detection system has a simple structure, the method is easy to operate, the clone devices can be found timely, the accuracy in clone detection is greatly improved, the clone detection period is shorted, and the detection method and system are conductive to the safety operation of the network and interests of network participants.

A method for deriving at least one operating parameter of a fluid-insulated electrical apparatus, in particular of gas-insulated switchgear. The operating parameter is dependent on a dielectric breakdown strength of an insulation fluid of the electrical apparatus. The insulation fluid includes at least three components that are assigned to at least a first and a second component group such that at least one component group comprises at least two components. The component groups differ in their weighted average values of the molecular masses of the components in the respective component groups. At least one quantity which is indicative of the concentration of the first component group and of the concentration of the second component group is determined from the insulation fluid, e.g. by measuring one or more measurement variables with one or more sensors. The operating parameter is then derived using the at least one quantity.

The invention relates to a systematic low-temperature plasma gas treatment tandem device which comprises low-temperature plasma tandem treatment equipment 1, an exhaust fan 2 and a water scrubbing tower 3, wherein an air outlet of the low-temperature plasma tandem treatment equipment 1 is connected with an suction opening of the exhaust fan 2; an air outlet of the exhaust fan 2 is connected with the water scrubbing tower 3 through a ventilation pipeline; housings are connected with standard ground; and the low-temperature plasma tandem treatment equipment 1 is provided with a plurality of pieces of low-temperature plasma treatment equipment. The low-temperature plasma tandem treatment equipment comprises a stainless steel discharge pipeline 3, a quartz dual-medium discharge pipeline 8 andplasma generators 10. The systematic low-temperature plasma gas treatment tandem device has the benefits that: 1) various gas treatment manners are effectively tandem, so that the device can effectively treat various gases with complicated components, a service life of the equipment is prolonged, and safe operation of the equipment is maintained; 2) overhaul channels are reserved at the front partand the rear part, and the device is convenient and reliable to operate and overhaul; and 3) the experimental device is fully automatic in operation and improves experimental efficiency.

The invention discloses a rainproof strain insulator. The rainproof strain insulator comprises a core rod, umbrella skirts, iron caps, reinforced rings, bearings, rain shielding plates, weight balanceapparatuses, bird-expelling needles and fixers; the umbrella skirts are fixedly arranged outside the core rod in a sleeving manner; the iron caps are fixedly arranged at the two ends of the core rodin a sleeving manner; the fixers are fixedly connected with the outer sides of the corresponding iron caps; the bearings are fixedly connected in the umbrella skirt connecting positions at the two ends; the rain shielding plates are fixedly connected with the top of the bearings through supporting rods; and the weight balance apparatuses are fixedly connected with the bottoms of the bearings through the supporting rods. By virtue of additional rain shielding plates outside the umbrella skirts, contact between the umbrella skirts and rain and snow in rainy and snowy days can be avoided, therebyavoiding corrosion to the umbrella skirts by rain and snow, avoiding a phenomena of umbrella skirt breaking caused by external force impact, reinforcing the protection effect on the core rod, prolonging the service life of the strain insulator, and maintaining safety operation of power transmission and transformation.

The amplifying circuit based on flux negative feedback is designed by using Multisim circuit simulation software, an amplitude-frequency characteristic curve and a phase-frequency characteristic curveof the amplifying circuit are analyzed, and the reliability of the amplifying circuit is verified. The research result can be used for amplifying the induced voltage at the two ends of the inductioncoil of the magnetic field sensor, widening the measurement frequency of the sensor and improving the sensitivity of the magnetic field sensor, and has great significance in maintaining the stable operation of the power cable, maintaining the online detection of the cable and maintaining the safe and stable operation of the power grid in China.

The invention relates to a fire spraying gear real-time regulation and control system and a corresponding terminal, and the system comprises a fire spraying execution device which is located in a ball body of a hot-air balloon and is used for executing fire spraying operation in the ball body so as to drive the ball body to ascend or descend; and a fire spraying driving mechanism which is connected with the fire spraying execution device and used for lowering the current fire spraying gear of the fire spraying execution equipment when receiving a gear lowering instruction; the fire spraying driving mechanism is further used for maintaining the current fire spraying gear of the fire spraying execution equipment when receiving the gear maintaining instruction. The fire spraying gear real-time regulation and control system and the corresponding terminal are safe and reliable, and have a certain self-control level. As the scene that the fire spraying flame area of the fire spraying execution equipment of the hot-air balloon is too large or even a driven balloon body is threatened can be detected in time, the fire spraying driving mechanism is automatically controlled to lower the fire spitting gear of the fire spraying execution equipment, and therefore safe operation of the hot-air balloon facility serving as a tourism project is effectively maintained.