Advantages and disadvantages of the hottest box tr

Advantages and disadvantages of box transformer in residential supporting

Abstract: in the workshop supporting, the most commonly used power supply supporting scheme of the power supply department is to adopt the power supply mode of type III station or type V station. Type III and type V stations are widely used because of their reliable power supply. Because as long as the equipment of type III and type V stations is properly selected, there will generally be no failure, that is, failure. As long as it is not a low-voltage bus failure, uninterrupted power supply can generally be achieved through the interconnection switch on the low-voltage bus...

key words: American box type substation, European box type substation, box type substation structure, residential supporting box type substation, the advantages and disadvantages of residential supporting box type substation in the workshop supporting, The most commonly used power supply supporting scheme of the power supply department is to adopt the power supply mode of type III station or type V station. Type III and type V stations are widely used because of their reliable power supply. As long as the equipment of type III and type V stations are properly selected, there will generally be no failure, that is, failure. As long as it is not a low-voltage bus failure, the uninterrupted power supply can generally be achieved through the interconnection switch on the low-voltage bus. In case of failure of type III or type V station, it is also convenient for emergency repair. However, due to the high cost of type III and type V stations, the uniformity test method of concrete admixture gb/t8077 ⑵ 000 has a large floor area, which is disgusted by real estate developers, especially today when they pay special attention to the environment of the community. With the progress of science and technology and the introduction of advanced technology, a new type of small distribution station is gradually replacing the old huge type III and type V stations, which is the box distribution station. Box type distribution station is divided into two forms: American box type substation and European box type substation. American box type substation and European box type substation have different applications due to their different structures and different reliability. Now the basic information of the two box transformers is introduced as follows: first, the difference between American box transformer and European box transformer: 1. American box transformer: 1). The wiring form of box transformer is one or two 10kV incoming lines; The capacity of a single transformer is generally 500kva~800kva; There are 4-6 low-voltage outgoing cables. 2) The main components of the box transformer are transformer, 10kV ring switch, 10kV cable plug, low-voltage pile head box and other main components. It has the advantages of small size, low cost and easy installation. Advantages and disadvantages of American box type substation 3). Advantages: small volume, small floor area, easy to place and high-end bars and poles, easy to camouflage, easy to coordinate with the environment of the community. It can shorten the length of low-voltage cable, reduce line loss, and reduce the cost of power supply. 4) Disadvantages: low power supply reliability; There is no electric mechanism, so it is impossible to add distribution automation devices; There is no capacitor device, which is unfavorable to reduce line loss; The noise is higher than that of type III and type V stations, because type III and type V stations place the average thin-layer transformers indoors to play the role of sound insulation; In addition, the centralized electromagnetic radiation of type III and type V stations is decomposed into multipoint radiation; Because the civil engineering foundation of box transformer with different capacity is different, it is inconvenient to increase the capacity of box transformer; When the box transformer is overloaded or the user increases the capacity, the civil engineering will be rebuilt, and there will be a long power outage time, which will increase the difficulty of the project. 2. European box transformer: 1) connection form of box transformer A. single distribution transformer form - two 10kV incoming lines; The capacity of a single transformer is generally 500kva~800kva; Low voltage outgoing cables are generally 4-6 ways. b. Form of two distribution transformers - two 10kV incoming lines; Two transformers, each with a capacity of 500kva~800kva; The low-voltage outgoing cable is generally 8-12 ways. 2) The main components of the box transformer are transformer, 10kV ring switch cabinet, low-voltage capacitor, low-voltage switch and other main components, which is equivalent to the compact installation of the equipment of type III station in the metal box, so as to miniaturize the type III station. The volume of European type box transformer is higher and larger than that of American type box transformer, and the cost is also larger than that of American type box transformer. 3) Advantages: noise