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32results about How to "Good protection level" patented technology

Method for evaluating pollution flashover risk of insulator of power transmission line

InactiveCN106570651AReduce equipment costsReduce the frequency and frequency of monitoringResourcesNeural learning methodsMonitoring dataTransmission line
The invention discloses a method for evaluating a pollution flashover risk of an insulator of a power transmission line. The method comprises the following steps of (1) obtaining meteorological data through a meteorological early-warning system and calculating a salt density value of the insulator of the power transmission line by adopting a BP neural network algorithm; (2) calculating 50% of pollution flashover voltage of the insulator under the salt density according to the calculated salt density vale and the meteorological data of a tower location; and (3) dividing the power transmission line into Num intervals, carrying out pollution flashover risk evaluation of the insulator of the power transmission line on each interval and finally calculating the pollution flashover risk of the insulator of whole power transmission line. Compared with the prior art, the method has the advantages that pollution flashover risk evaluation of the power transmission line is carried out by providing given meteorological conditions on the basis of meteorological and salt density monitoring data of historical records, so that real-time online contamination monitoring is not needed, a lot of online contamination monitoring devices do not need to be arranged on the power transmission line and the equipment cost can be reduced.
Owner:STATE GRID CORP OF CHINA +2

Multi-channel multi-functional ultrasonic heat and cold amount meter

The invention relates to a multi-channel multi-functional ultrasonic heat and cold amount meter. The heat and cold amount meter comprises a meter body, a meter head upper cover, a meter head lower cover and a temperature sensor. A glass window is arranged at the top of the meter head upper cover, a circuit board is arranged inside the meter head upper cover, the meter head upper cover is connected with the meter head lower cover through fixing screws, a pipeline extending downwards is arranged on the meter head lower cover, the meter body is in a hollow pipeline shape, and the two ends of the meter body are provided with a water inlet and a water outlet respectively. Transducer installation holes are formed in the two sides of the meter body, ultrasonic transducers are installed in the transducer installation holes, and wire penetrating holes are connected above the transducer installation holes and connected with the pipeline of the meter head lower cover, and the meter body is further provided with a temperature measuring hole and a pressure measuring hole. Through kinds of seal and protection treatment, the protection grade of the product reaches the level of IP68, and the heat and cold amount meter can normally work under kinds of environments and is particularly suitable for occasions of an unstable water field, a severe using environment and a turbid sewage medium environment.
Owner:BEIJING ACCURATE ENERGY & TECH

Cabinet body temperature and humidity regulating device, using method thereof and cabinet body applying same

The invention discloses a cabinet body temperature and humidity regulation and control device, a using method thereof and a cabinet body applying the same, and belongs to the technical field of heat exchange devices. The cabinet body is provided with a cabinet body wall and a cabinet body cavity located in the cabinet body wall. The cabinet body wall is provided with a communication port. The cabinet body cavity is connected with the outside of the cabinet body through the communication port. An electric refrigeration element is further included; the electric refrigeration element is arrangedat the communication port and is in sealed connection with the edge of the communication port; the electric refrigeration element is provided with a first end and a second end; the first end faces thecabinet cavity, and the second end faces the outside of the cabinet body. When the first end is a refrigeration end, the second end is a heat dissipation end; and when the first end is the heat dissipation end, the second end is the refrigeration end. According to the device, external electric energy can be converted into cold energy through the electric refrigeration element, and the cold energyis transmitted to cool the interior of the cabinet body through the cold dissipation aluminum profile, so that high temperature is prevented; meanwhile, heat generated after the electric refrigeration element is electrified can be discharged out of the cabinet body by utilizing the heat dissipation aluminum profile, so that heat exchange between the inside and the outside of the cabinet body is realized.
Owner:北京威能通电气设备有限公司 +1

Novel closed type chain link group applied to drag chain

The invention relates to a novel closed type chain link group applied to a drag chain. The novel closed type chain link group comprises a plurality of chain link units, all the chain link units are sequentially connected end to end, each chain link unit comprises a side plate and a supporting connecting panel, the side plate is divided into a left side plate and a right side plate, the left side plates and the right side plates are arranged on the two sides of each supporting connecting panel, the two adjacent chain link units are movably connected, the novel closed type chain link group is characterized in that each supporting connecting panels is provided with a front connecting panel and a rear connecting panel, the end face of the rear connecting panel is machined into a rear plane with a downward recess, the front connecting panel is arranged at the front end of the rear connecting panel, the lower side of the front connecting panel is processed into an arc-shaped inwards-concave surface, inwards-arranged fluctuation is formed, the rear plane is machined into a convex face matched with the arc-shaped inwards-concave face, and an inwards-concave arc-shaped area is formed between the rear plane and the rear connecting panel, when one chain link unit is connected with the adjacent chain link unit, the front connecting panel of one chain link unit is located on the rear plane of the other adjacent chain link unit, and a closed face with a gap of 0.1-0.5 mm is formed by the front connecting panel of one chain link unit and the rear plane of the other adjacent chain link unit, and when the adjacently connected chain link units are in a plane state, the end part of the front connecting panel positioned on the rear plane is arranged in the inwards-concave arc-shaped area. The closed face structure is designed structurally, the protection grade is better, particles with the particle size of 0.3 mm or above can be prevented through the novel closed face during normal operation of a product, and the problems of instability of drag chain operation and short service life caused by falling of the particles at present are solved.
Owner:浙江永驰科技有限公司
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