On-site feeder automatic protection method and application thereof

Abstract

The invention discloses an on-site feeder automatic protection method and an application thereof. The designed modular protection method includes instantaneous trip protection, overcurrent protection, post-acceleration protection, voltage-loss tripping protection, voltage-feed closing protection, current type reclosing protection, zero-sequence current protection, one-side voltage-loss automatic switching protection, latching current tripping protection, transient voltage latching automatic closing protection, closed-loop control protection and two-side under-voltage latching protection. A feeder terminal panel designed by adopting the on-site feeder automatic protection method integrates main line, branch line and contact modular switches. The on-site feeder automatic protection method and the application thereof can achieve on-site fault isolation and non-fault region power supply recovery without relying on a main station of a power distribution network and communication, and improve troubleshooting speed and reliability; and the operating personnel in a power supply company selects modes of the switches according to position of a power distribution network line, and convenience is brought to the operating personnel for use.

Description

technical field [0001] The invention relates to power system protection, and is especially suitable for distribution network automation systems. Background technique [0002] In recent years, with the rapid development of power system related technologies and the introduction of the concept of smart grid, there are higher requirements for the safety and reliability of distribution network feeder line operation. In the existing distribution network system, the detection of local power grid information is completed through the feeder automation terminal and sent to the control substation or the main station, and the specific fault area is obtained through the calculation and analysis of the distribution network automation system software of the main station, and then by The master station sends an instruction to remove the fault area to realize the feeder automation function. However, under the current technical conditions of distribution network automation, no power company ...

AI Technical Summary

Problems solved by technology

However, under the current technical conditions of distribution network automation, no power company has really used this automatic protection control technology. In some pilot projects of distribution network automation, the master station of the distribution network is still used to provide fault handling suggestions, and then the personnel of the power supply company will come The main reason for manually determining the fault handling plan is that my country's power distribution network is too complex, and the software calculation of the distribution network master station is not reliable enough; at the same time, all the information and control of fault handling depend on the control master station, which depends on the speed and reliability of communication , it may not be able to deal with the fault in time due to reasons such as the processing speed of the master station and the reliability of communication, resulting in damage to the grid equipment and the occurrence of large-scale power outages

[0003] Generally, voltage-time type load switch or current-time type circuit breaker is used for automatic fault treatment of local feeders that do not depend on the main station and communication. However, in the complex distribution network environment with multiple power sources, the protection setting Cooperate

General distribution network switches are divided into three types: main line segment switch, branch line boundary switch and dual power contact switch. The switch needs switches with different protection functions according to different grid positions. At present, there is no universal protection switch on the market. The personnel of the power supply company are required to select and set parameters, which also brings difficulties in technology and product use to the personnel of the power supply company

Images