Difference between public transformer and special transformer in distribution system

Public transformer and transformer are two different power supply modes, and the main differences are as follows:

1, public power supply mode, refers to the power supply equipment of real estate, including line transformers, which are installed by the power supply bureau and maintained and managed by the power supply bureau for life. When a fault occurs, just dial 1 10, and the 24-hour emergency repair team of the power supply department can arrive at the scene of the accident in the shortest time for emergency repair, and immediately restore the power supply, and the maintenance cost will never be spread to the users.

2. Changing the power supply mode refers to the self-management power distribution room in the residential area, which is managed by the residential property and pays the electricity fee. The power supply company will only install a master meter in its own distribution room, and usually only charge electricity on this master meter. In addition to the local power distribution room, all other electricity consumption in the community is connected from the self-management power distribution room.

When the substation scheme and preliminary design are carried out, the design should be carried out in accordance with the relevant measurement and relay protection methods of regional power grid, and the consent of the power supply department should be obtained. The user's electric energy metering settings shall conform to the following principles:

1. Public management users (public transformers): users directly managed by power supply departments (such as substations in residential quarters, transformers on urban telephone poles, etc.). ) and power supply adopts low-voltage metering to households.

2. Self-managed households (special transformer):

(1) The equipment capacity ≤ 100kW is a low-voltage user with no transformer, and the low-voltage master meter is adopted.

(2) The transformer capacity ≤2x400kVA is a high-voltage user, and the low-voltage side metering mode of high-voltage power supply is adopted.

(3) Transformer capacity &; gt； 800kVA is a high-voltage user, and the high-voltage side metering mode of high-voltage power supply is adopted.

3. Calculation method of electricity fee for civil users:?

(1) Users who charge by government administrative units, institutions and military units will be charged with power fees and lighting fees respectively; According to the smaller load between the two, set up sub-meter metering (residential metering to households). ?

(2) Users who adopt the commercial billing method will collect electricity and lighting fees in a unified way (residential buildings are metered to households).