Centralized bus-bar protection extension access capability method and device

Abstract

The invention discloses a centralized bus-bar protection extension access capability method, which comprises the following steps: connecting a bus-bar protection host with an analog quantity extension device, and realizing the extension of an analog quantity channel; connecting the bus-bar protection host with a switching value extension device, and realizing the extension of a switching value signal. The bus-bar protection host and the analog quantity extension device are respectively subjected to an analog quantity sampling, and highly reliable sampling synchronization independent of an external synchronous source is realized by using a synchronous sampling method independent of the external synchronous source; the analog quantity extension device sends synchronized sampling data to the bus-bar protection host, and the bus-bar protection host performs protection logic programming by using the received synchronized sampling data and self-sampling analog quantity data; input and output of the switching value signal are realized through a data bus by the bus-bar protection host and the switching value extension device respectively. The invention also discloses a centralized bus-bar protection extension access capability device. The method and the device are flexible and reliable, and the protection access capability of a centralized bus-bar is improved, meanwhile the number of devices and communication links are greatly reduced, and the overall reliability is high.

Description

technical field [0001] The invention relates to the busbar protection technology in the field of electric power system relay protection, in particular to a method and a device for expanding access capability of centralized busbar protection. Background technique [0002] Microcomputer busbar protection is the most widely used busbar protection at present. At present, there are two main types of microcomputer busbar protection, one is centralized busbar protection, and the other is distributed busbar protection. [0003] Such as figure 1 As shown, the centralized busbar protection implements all the protection functions by one device. The advantage is that the functions are highly centralized, and there is no need to pay attention to the sampling synchronization problem, and the reliability is easy to guarantee. The disadvantage is that the access capability is fixed. When the number increases, the existing centralized busbar protection is difficult to realize the disadvanta...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the main wiring scale of the busbar exceeds the access capability of the centralized busbar protection, and the use of distributed busbar protection increases the equipment investment cost and the overall reliability is poor, and provides a flexible and reliable centralized busbar protection with extended access capability method and device

Images