Method for temporary segmentation of distribution network

Abstract

The invention provides a method for temporary segmentation of a distribution network. The method comprises the following steps of (S1) determining a connection mode of a planned maintenance section; and (S2) when a planned maintenance line adopts a radial connection mode, selecting a tower next to the planned maintenance section as a bypass switch mounting point A, carrying out charged on-load mounting of a bypass switch on the bypass switch mounting point A before maintenance and achieving power-on and power-off of the planned maintenance section through opening and closing of the bypass switch during maintenance; and when the planned maintenance line adopts a ring network connection mode, firstly determining an opposite-side power supply of the planned maintenance line, determining the towers at two ends of a planned maintenance range as a bypass switch mounting point B and a bypass switch mounting point C separately, carrying out charged on-load mounting of the bypass switches on the bypass switch mounting point B and the bypass switch mounting point C before maintenance and achieving power-on and power-off of the planned maintenance section through opening and closing of the bypass switches during maintenance. According to the method, the number of accompanied power outage users in the planned maintenance process can be effectively reduced and the power supply reliability is effectively improved.

Description

technical field [0001] The invention relates to the field of power grid maintenance methods, in particular to a method for temporary segmentation of distribution networks. Background technique [0002] Generally speaking, the segmentation of distribution network lines is a problem that requires comprehensive consideration of investment economy and equipment reliability. Because increasing the number of subsection switches in the distribution network and optimizing the location of the subsection switches can improve the reliability of power supply, but the increase in the number of subsection switches will lead to an increase in the overall investment of the power grid. At the same time, with the increase in the number of subsection switchgears, The reliability of equipment will also continue to decline, which will reduce the reliability of power supply. Therefore, the grid structure of the existing distribution network, regardless of the ring network connection method or the...

AI Technical Summary

Problems solved by technology

[0003] First, if the conventional power outage construction method is adopted, due to the large segmented range of the grid structure, a large number of users accompanying power outages will be generated outside the normal maintenance and construction power outage of some users, which will seriously affect the overall power supply reliability of the distribution network and users. Satisfaction with electricity use;

[0004] Second, if the traditional construction method of bypass cable without power interruption is adopted, the ideal effect of no power interruption for all users can be realized in theory, but in actual production, it will not be able to be carried out due to the following factors:

[0005] 1. Because the bypass cable laying and deployment and bypass switch installation are required to replace the normal operation line when the bypass cable is not powered off, a complete and long section of the overall construction channel and the bypass cable deployment channel are required, and the minimum maintenance is one level When conducting the wire, it is necessary to bypass the calculation of the third-grade wire, and usually need to have more than 150 meters of cable laying and deployment channels. These channels are often located on social vehicles and pedestrian-intensive roads. For the safety of personal and equipment, in the During the construction period, it is very unrealistic and difficult to evacuate and prohibit the normal working and living personnel and vehicles in the passage from entering and exiting.

[0006] 2. The operation lasts for a long time and requires high meteorological conditions during the operation. Once there is a temporary sudden thunderstorm or other weather change that may cause construction safety, the entire bypass cable will stop working without power failure. In severe cases, the incomplete The equipment that has been installed and laid is protected from rain or recovered, which will delay the overall construction progress

[0007] 3. The construction vehicles, equipment and personnel are complex, and the overall cable operation without power failure requires various special operation vehicles such as live working arm trucks and bypass cable laying cable cars; bypass cables, bypass switches, intermediate connectors of bypass cables, and ground A large number of special special equipment such as insulating blankets and special cover plates for bypass cables require the participation of multiple types of personnel such as bypass cable laying personnel and live working personnel. wide, high security risk

[0008] The above two operation methods are either due to the large scope of the original line segmentation, resulting in power outages for many enterprises and users not within the scope of maintenance and construction, resulting in direct economic losses

Either due to various factors such as the on-site environment, it is impossible to carry out cable non-stop operation. In the end, due to the time limit requirements such as time nodes and construction periods, the actual construction has to adopt the operation method of all power outages in sections, which seriously affects the overall power supply reliability of the distribution network and User Satisfaction with Electricity

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