Control method, control terminal and control system of sectionalizer

Abstract

The invention provides a control method for a sectionalizer. The actuation time of the sectionalizer is flexibly controlled through inverse time limit overcurrent protection characteristics, when overcurrents exist in a transmission line, the actuation time of the sectionalizer is short when the overcurrents are large, the larger delta t is, the quicker a set critical value t is reached through accumulation, the actuation time of the sectionalizer is long when the overcurrents are small, the smaller delta t is, the slower the set critical value t is reached through accumulation, and therefore the power supply restoration time of the transmission line can be well shortened. The actuation time is short when the overcurrents are large, and the probability in which the transmission line and equipment are damaged can be decreased. The invention further discloses a control terminal and system for the sectionalizer.

Description

technical field [0001] The invention relates to the field of feeder automation, in particular to a control method, a control terminal and a control system for a sectionalizer. Background technique [0002] With the rapid development of the economy and the improvement of people's living standards, users have higher and higher requirements for the quality of power supply. To improve the reliability of power supply, we must focus on the distribution network. Because in the current power system, the distribution network is a short board that affects the reliability of power supply for users. The investment in the distribution network is relatively insufficient, and the level of automation is low, which is a very weak link. Feeder automation is one of the main tasks of distribution network automation. When a fault occurs, timely and accurately determine the fault section, quickly isolate the fault and restore power supply to the non-fault section. At present, there are two main ...

AI Technical Summary

Problems solved by technology

[0006] At present, the voltage-time feeder automation scheme is mostly used. Although it has been improved to a certain extent on the traditional basis, there are still the following deficiencies: first, when an instantaneous fault occurs, it needs to be restored by reclosing one by one with the help of switches, so it cannot The power supply is restored in a short time; for permanent faults, it is necessary to experience a reclosure and sequential closing to determine the fault section, and the number of switch actions is large, which not only has a large impact on the equipment, but also takes a long time to restore power supply; for improved The voltage-current-time scheme is only used to detect overcurrent pulses and count the number of overcurrents; in addition, various schemes do not consider the processing when a single-phase ground fault occurs on the line

Images