Application of PLC on the hottest power line in li

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Application of power line (PLC) in living quarters

the domestic low-voltage distribution network structure is complex, and the building distribution structure of different floors and different construction periods are different, so the access scheme is not unified. PLC network structure is flexible and can be changed according to the number of users. According to the characteristics of distribution lines, building structures and users, the scheme can be divided into three cases: high-rise residential buildings, low-rise residential buildings and commercial office buildings

low rise residence

building structural characteristics: each residential building on the ground floor has 5 to 6 floors, which is divided into multiple units, each unit has independent stairs, and each floor has 2 to 4 households. There are usually 60 ~ 80 households in the building, and the larger ones can reach 100 households. Low voltage distribution structure: a distribution transformer is responsible for 5 ~ 6 buildings, and each unit has a power line from the ground floor to the top floor. There are electricity meters of users on each floor, and the total electricity meters of all users of the unit on the first floor. Group scheme: fttz+plc or optical fiber to transformer +plc scheme is adopted. Based on the physical network division of power distribution, a PLC office equipment is placed in a unit, and users share power lines. When there are few users, the sharing scope can be expanded, and several units or even several buildings can be shared. When the number of users increases (5) the spring fatigue testing machine is simple to operate, and then according to the distribution of users, it can flexibly divide the sharing range. PLC modems are connected to user computers through USB, RJ45 and other interfaces to ensure end-to-end 2Mbps bandwidth. Multiple PLC modems can form a small local area. The scheme is aimed at the common problems of the user phase 3T wire insulation tensile testing machine, which is concentrated on residential buildings with less demand

high rise residential buildings

in fact, the building structure is special: the new high-rise residential buildings are more than ten to twenty floors high, and the density of residents is large and concentrated, with about 150 to 200 households in each building. Low voltage distribution structure: there is usually an independent distribution room in the basement of the building, and a distribution transformer converts 10KV voltage into 220V civil voltage. There are many power lines leading to households in the building, and each power line transmits electricity to households on one or several adjacent floors. The three-phase load of the power line is basically average. There is a distribution box in the shaft on the floor, in which there is a floor master meter and a household sub meter. Group scheme: fttb+plc scheme is adopted for access, with optical fiber to the community and optical fiber to the building. PLC access is adopted in the building. Based on the physical network of power distribution, the power distribution is divided into different users to access the shared area, and the access scheme is determined according to the actual situation. The PLC local end equipment is placed in the power distribution room in the basement, and the users on one floor or adjacent floors of the same power line are used as a shared area to share a PLC local end equipment. If there are few users, multiple shared areas can be merged and connected to the same device. If users are divided into three-phase lines, users using A-phase lines share A-phase power lines; Users of the whole building can even share the same power line. This can ensure the bandwidth of users while maintaining a high utilization rate of devices. After the number of users increases, the sharing area can be easily separated, which will not affect the use of the original users. The user equipment PLC modem separates the data signal from the power line and connects with the user computer through USB, RJ45 and other interfaces to ensure the end-to-end 2Mbps bandwidth. Multiple PLC modems can form a small local area. The scheme is mainly aimed at high-rise residential buildings in residential areas with concentrated users and high occupancy rate, and can be combined with remote meter reading, housekeeping automation and other applications

commercial office buildings

commercial office buildings are mainly small and medium-sized enterprises. These users do not have high demand for network bandwidth and security, and PLC broadband access can meet the requirements of users. The access of the office building adopts the scheme of FTTB + Ethernet +plc, with optical fiber to the building. Install a switch or hub as the core switching equipment of the building, and make Ethernet generic cabling on the floor to ensure 100m bandwidth to the floor. Install PLC office end equipment in the floor distribution room, and divide the shared area according to the number of ports required by enterprise users. Users with a large number of ports can share a p controller as the core LC device of the control system, and users with a small number of ports can share the PLC device. The signal is transmitted to the office room through the power line and reaches the user's computer through the PLC modem. Enterprises that adopt PLC access do not need to make wiring in the office. They can use power lines to realize high-speed connection and establish internal local areas of the enterprise at the same time

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