Fuse selection The selection of the fuse should ensure that the distribution transformer internal or the high and low voltage outlet pipe can be quickly fused when there is a short circuit. In practice, the following principles are often used for selection; if the capacity of the distribution transformer is below 160KV, the fuse should be 2-2% of the rated current of the transformer.
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The role of drop-out fuses10kV equipment can be installed on the high-voltage side of the transformer on the pole, where the transformer and capacitor are connected to the line. The drop-out fuse can effectively protect the circuit from overload and short-circuit. At the same time, it can also be installed at the end of a long line or on a branch line, which can provide extended protection for areas that cannot be protected by relays.
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Drop type (drop type, detachable type) lightning arrester is a distribution type zinc oxide lightning arrester that is modified and skillfully installed on the drop type mechanism of the drop type fuse, so that the lightning arrester can be easily detected, repaired and replaced with the help of an insulating switch lever under the condition of continuous power supply, which not only ensures the smoothness of the line, but also greatly reduces the work intensity and time of power maintenance personnel, It is especially suitable for places that are not suitable for power failure, such as post a
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installation and use 1. The fuse allows horizontal or vertical installation 2. When the data of the melt tube does not match the voltage and rated current of the line, it must not be connected to the line for use. 3.
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FN12-12 and FN12-12R combined apparatus are three-phase high-voltage switchgear with a rated voltage of 12KV and a rated frequency of 50Hz. They are used for breaking and closing load current, closed-loop current, no-load transformer and cable charging current, closing short circuit current, and load switches equipped with grounding switches.
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ZFN21-12D/630-20, ZFN21-12DR/T125-31.5 high-voltage vacuum load switch and combination apparatus are used in three-phase AC 10KV, 50Hz power distribution system. It has the advantages of compact structure, small volume, light weight, long service life, strong making and breaking capacity, safety and reliability, etc.
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use environment a. The altitude does not exceed 1000 meters; b. The surrounding air environment has no conductive dust and no corrosive, flammable and explosive gases, etc.; c. Wind pressure does not exceed 100Pa (equivalent to wind speed 34m/S); d. The earthquake intensity does not exceed magnitude 8; e. The annual temperature difference ratio is within ±40°C.
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The sight is mainly used for aiming and shooting with corresponding weapons by personnel of armed police, public security and other units. It can also be used for hand-held observation mirror search and monitoring.
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Night vision instrument is mainly used to identify targets at close range (250mm ~ 10m) at night, operate equipment, read documents and observe. For target search. The low illumination CCD and infrared lighting mode can also be replaced by ICCD mode.
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Type B double tube binocular low light level observation mirror can assist pilots to directly observe the environment and search targets in the night, complete night takeoff and landing, formation flight, visual recognition of landmark landform, heaven and earth line, aerial reconnaissance and recognition, search and recognition of ground targets at low altitude, and cooperate with forward-looking infrared to search.
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Very good delivery time. Lowest price in the world. Can work with C308, C330 or C363 stirling cooler. Very good reliability.
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The multifunctional handheld thermal imager has the functions of infrared, visible light observation, GPS positioning, orientation and laser ranging, and can realize the observation of targets in day and night and under adverse weather conditions
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The direct coupled low light level enhanced digital camera (idc1616) adopts the advanced image tube direct coupling technology to integrate the digital camera and image intensifier, forming a new generation of low illumination digital night vision equipment with compact structure, high sensitivity and clear imaging.
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Glass Pin Insulator is extremely convenient for transportation and installation; it adopts non-breakthrough type design, no need to measure zero value during operation; reliable structure, no damage to the core bar, and can give full play to its mechanical strength.
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Hjk-m series monitoring thermal imager can be used in industrial production detection, chemical industry and precision electronics. Equipped with this series of thermal image products, it is like a special eye to break the dark cover and uncover all kinds of camouflage.This series of monitoring thermal imager adopts modular and standardized design, which can be quickly and easily installed on various vehicles and ships currently equipped.
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It can diagnose the fault of the thermal imager through the communication port of the thermal imaging system, locate the fault group components conveniently and quickly according to the built-in fault expert database, and greatly improve the maintenance efficiency of the fault thermal imager;Through the self-developed comprehensive performance test algorithm of thermal imager, it is convenient and accurate to test the performance parameters of thermal imager: minimum resolvable temperature difference (MRTD), minimum detectable temperature difference (mdtd), field of view (FOV), zero travel mom
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The general low light level gun sight is a sight with high definition, good combination of gun and mirror, strong adaptability, reliability and durability, stable performance, good man-machine efficiency and low cost. It is suitable for short-range accurate shooting at night and can solve the rapid aiming and accurate shooting at 25-100 meters at night. The fixture can be quickly changed to adapt to various gun types.
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HT series reflective infrared collimator is used for the assembly, correction and detection of infrared optical products and optical parts. It has long focal length, large aperture and high precision. It is a necessary general equipment for the production and testing of infrared optical instruments.
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The low light level sight integrates the functions of observing and aiming, measuring the target distance and setting the weapon firing angle. It has the characteristics of small volume, light weight, high aiming accuracy, good reliability and convenient carrying. It can be used not only as a night sight, but also as an observation command mirror for night observation. It is mainly used for observation and monitoring by personnel of border armed police, public security and other units, and it is a precision optical instrument product for assisting gun aiming and shooting at night.
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Long focal length: it can provide higher spatial frequency for the system to be tested; Large aperture: provide testing possibility for multi-channel optical system; The target plate and blackbody have high infrared emissivity; The system is equipped with vibration isolation air cushion platform; Electrically controlled target wheel is easy to operate and replace; It can meet the test of large aperture thermal imaging system; It can realize the semi-automatic test of all the main parameters of the thermal imager system; High performance test software system.The parameters of the thermal imager
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Itc-3c adopts the modular design idea. The three optical axes of thermal imager, laser ranging system and CCD camera system are parallel to each other. It can output two analog video signals in the infrared and visible bands of the target and background (the two bands are independent of each other). If necessary, it can range the target according to the overall instruction.
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For border and coastal defense monitoring and important places, long-distance and ultra long-distance observation equipment is essential. Long focus and multi field of view infrared thermal imager products can well meet the needs of long-distance observation at night. The infrared optical system designed with long focus and multi field of view can not only meet the needs of target search, but also meet the needs of further observation.
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1. Reasonable design, novel structure, reliable technical performance, compact shape, light weight, flexible installation, high tensile strength, collision resistance, and no damage during transportation;2. The advantages of silicon rubber sheathed metal oxide arrester are cited.
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