Medium voltage distributed power supply and distribution system used in high-rise buildings

Abstract

The invention provides a medium voltage distributed power supply and distribution system used in high-rise buildings, belonging to the field of power supply and distribution system technology. The power supply and distribution system comprises a high voltage incoming line, a high voltage outgoing line, a low voltage power transmission line, an electrical appliance, a micro box-type substation and a medium voltage switching station. The medium voltage distributed power supply and distribution system is characterized in that one end of the medium voltage switching station is connected with the high voltage incoming line, and the other end of the medium voltage switching station is connected with the high voltage outgoing line; one end of the micro box-type substation is connected with the high voltage outgoing line, and the other end of the micro box-type substation is connected with the low voltage power transmission line; the other end of the low voltage power transmission line is connected with the electrical appliance; and the micro box-type substation comprises a box body, the box body is rectangular, and the box body includes a main body, a top cover and a safety door. According to the medium voltage distributed power supply and distribution system provided by the invention, the medium voltage distributed power supply and distribution mode is adopted, the micro box-type substations are separately arranged on the large buildings and high-rise buildings with larger load to ensure that the transformer is set as close as possible to the electrical load, and thus the length of the low voltage line can be reduced; and meanwhile, due to the shorter distance from the low voltage power transmission line to the electrical appliance, the smaller voltage drop and power transmission loss can be achieved.

Description

[0001] 【Technical field】 [0002] The invention relates to the field of substation systems, in particular to a medium-voltage distributed power distribution system used in high-rise buildings, which can save electric energy and stabilize the power quality of users. [0003] 【Background technique】 [0004] Substation, a place where voltage is changed. In order to transmit the electric energy from the power plant to a distant place, the voltage must be raised to become high-voltage electricity, and then the voltage is lowered as needed near the user. This work of raising and lowering the voltage is done by the substation. The main equipment of substations are switches and transformers. According to the size, the small ones are called substations. A substation is larger than a substation. Substation: generally a step-down substation with a voltage level below 110KV; substation: including "step-up and step-down" substations of various voltage levels. A substation is a power fac...

AI Technical Summary

Problems solved by technology

[0005] At present, the box transformers in most substations are large-scale box transformers. After the high-voltage line enters the line, it is connected to the transformer in the box transformer, and then the low-voltage line is distributed from the low-voltage end of the transformer to lead into the building. The box transformers are large in size and are arranged side by side Arrangement requires a longer low-voltage line to connect with the user's electrical appliances, which not only wastes space, but also increases the cost of the wire and the power loss of the wire. In addition, in the community of high-rise buildings, another area needs to be planned for placing large box transformers.

Not only does it need to take up more space, but it also needs safety protection to prevent people in the building from getting an electric shock, which poses a certain safety hazard; in addition, electricians need to enter the box to operate the replacement and maintenance of the electric meter or power distribution control , There are also certain hidden dangers to the safety of electricians, and it is easy to cause electric shocks to electricians, and the temperature inside the box transformer will rise due to the heating of equipment, especially in hot summer, it is also very unsafe for electricians to perform maintenance or other electrical operations. comfortable

At the same time, the traditional power supply method: 10kV medium voltage terminal users use radial and transformer centralized power supply from the power supply and distribution system, and often arrange large-capacity transformers close to the main load center, so that although the power distribution system has high power supply reliability , easy to manage, but there are many lines and high-voltage switchgears, and it is suitable for power distribution systems with a small number of outgoing lines and close distances

[0006] Due to the large capacity of the transformer, the breaking capacity of the low-voltage protection device is high. For the equipment far away from the load center, the low-voltage line is long, the consumption of non-ferrous metals is large, the line loss is large, the terminal voltage sometimes does not meet the requirements, and the quality of power supply is poor; and it cannot be detected in time. Problems or monitoring the user's circuit status, resulting in the need for a lot of manpower and material resources, and the efficiency is reduced

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