A load switch plus fuse cabinet, the average cost of more than 10,000 yuan, if the use of KYN-series hand-cranked vacuum circuit breaker cabinet, the cost of tens of thousands. If the breaking capacity requires 50kA, the vacuum hand-operated switchgear will cost more than 100,000 yuan each. If the load switch and the current-limiting fuse are replaced, the expected short-circuit current is 50kA, but the investment is more than 10,000 yuan.
2. Use a load switch with a current limiting fuse to feed the transformer.
The protection of the transformer is sometimes even better than the circuit breaker, mainly due to the rapid and limited flow of the fuse cut-off, which benefits other components in the same circuit, that is, the requirements of dynamic and thermal stability are no longer considered.
3. The transformer can be fully protected.
The load switch fuse cabinet that feeds the transformer should use the full range protection current limiting fuse. The full range protection fuse is a new type of current limiting fuse, which can reliably break the current causing the melt to melt to the rated opening. Any fault current between the breaking currents, so that the protection overcurrent range is very wide. Of course, in order to better protect the overload of the transformer, a current transformer can be added, and the load switch trip mechanism is actuated by the protection device. The load switch breaks the overload current, and the slightly larger fault current is interrupted by the fuse. The intersection of the two breaking currents is called the crossover current. Because of the error range of overload tripping and fusing, the crossover current also has a certain range. Less than the handover current is interrupted by the overload trip action load switch, and the fuse is responsible for cutting off when the handover current is greater than the handover current, thereby restoring the transformer to obtain full overcurrent protection. However, it is very difficult to protect the transformer overload with a fuse, because the full range protection does not mean the full range protection of the transformer overload, but the fuse protection range is relatively large, such as the melt current is 125A, the breaking 50kA, does not mean the current from It can be protected in the range of 125A to 50kA, but it will start to fuse after a certain multiple of the rated current of the melt, thus it is difficult to protect the overload of the transformer. For this reason, the transformer overload should be carried out on the low voltage side, and the transformer low voltage outlet main switch protection transformer is overloaded. As long as the low voltage side is not overloaded, the high voltage side will not be overloaded. If the transformer is overload protected on the high voltage side, as described above, the current transformer, current relay, and intermediate relay act on the high-voltage side load switch release, which cannot be misdirected by the full-range protection fuse, so that the transformer cannot be overloaded. protection.
4. Small size and small footprint.
For high-rise buildings, it can be said that the size of the gold, so that the switch station consisting of ring network cabinets, occupying less space, which invisibly brings greater investment benefits.
What is more commendable is that the small-sized ring network cabinets are concentrated in one box to form a ring network switch station, which can be placed next to the building or simply placed on the side of the road, which does not occupy the user's building area and brings more to the user. The benefits, and the power supply department is easy to manage, and accidents do not have to enter the user's building for easy maintenance.
The ring network switch station can be used as a common switch station in the city, which brings greater convenience to the management of the power supply department and also expands the power supply range.
5. Easy to install and easy to expand.
Generally, the ring network switchgear is very convenient to install, and some do not need to excavate the foundation ditch. As long as the high 20# channel steel is fixed by the expansion plug, the ring net cabinet can be fixed on the channel steel. For the outdoor ring switch station, in order to prevent the intrusion of water, a foundation pier with a height of 400 mm is used, and then the equipment base channel can be erected on it.
When the electric equipment is added, it is very convenient to add the ring network cabinet. Just add the cabinet to the original cabinet and the horizontal busbar can be connected.
6. The power supply recovery time is short.
The switch station (or user substation) powered by the ring network is equipped with an intelligent measurement and control module, and the power supply side substation main control room is provided with a ring network monitoring substation. Intelligent network management is realized by using optical cable or five types of twisted pair networking. On-duty personnel can observe the operation of the ring network without leaving the house, complete fault diagnosis, fault isolation, network reconstruction, and load deployment. The loop fault segment can be quickly isolated and the system can quickly restore power. Of course, in order to achieve this goal, in addition to the intelligent measurement and control module, each switch station in the network should be equipped with a current transformer to detect the current. The load switch uses an electric operating mechanism, and the operating power can be obtained from the power side voltage transformer.
Some people think that the radial power supply is reliable. This is an inertial thinking. Once the radiation supply cable is faulty, it takes a long time to eliminate it. It is better to use the fault isolation method to restore the power supply. In view of this, it is no problem that the ring network power supply satisfies the secondary load. So this is why the ring network switchgear is now more and more widely used.
Indoor Rental Die-Cast 576x576
Indoor Rental Led Wall Panel improved competitive price with perfect effect and high quality. The Led Video Wall Die Casting Aluminum Cabinet size is 576x576mm for Indoor Usage, Best resolution for Rental Indoor Led Video Display P6mm P3mm, Rental Led Display Screen Panels to achieve uniform brightness and driving chip of high consistency and pixel brightness consistency.
The led screen showed more uniform and more clear. When choose 576mm x 576mm Led Display Rental Cabinet, it can depend on different price for P3 P6, because all their module size can be 192x192mm, it is easy to make 576x576 Die Cast Aluminum Cabinet.
Light and slim seamless connection design die-casting aluminum cabinet, it`s only 90mm in thickness which can achieve better wall mounted effect The cabinet is light, it`s only 28kg/sqm which is labor saving.
1) Stronger protection: LED chips are welded on the PCB board directly, then do encapsulation. It has excellent protection capabilities.
2) Higher reliability and stability: simpler process on material using and producing than SMD, so it has higher performance on heat dissipation to prolong life span.
3) Larger viewing angle: has larger viewing angle and is easy to control the loss of light refraction.
Easy Installation: magnesium alloy cabinet design and fast lock make the installation, transportation, maintenance easier
Lightweight: only 30kgs, saving workforce and transportation cost
High Waterproof Level: IP65 for rear and back side, fit for naked installation without decoration.
Adopt dual service of black kingkong series among core techniques, free back service path for all kinds of installation surroundings.Broadcast level color scale, color temperature and brightness adjustable intelligentizedly, smooth color, high color ratio, nature pictures.
We Jongsun LED is specialized manufacturer from Shenzhen China, which focusing on the research and development, production, sales and engineering services of terminal LED Displays. We have the perfectly after-sales and 7x24hours technical support. Looking forward your cooperation!
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Shenzhen Jongsun Electronic Technology Co., Ltd. , https://www.jongsunled.com