A data transmission method for in-situ protection devices based on double-ring network

Abstract

The invention relates to a data transmission method of an in-situ protection device based on a double-ring network. More than two sub-machines of an in-situ protection device are formed into a double-ring network; each sub-machine separately collects external analog signals, converts them into digital quantities, and performs After the encoding and encoding are completed, send the data to the ring network; judge whether there are unreceived slave data frames, and integrate the local data and the ring network transmission data for framing; after completing the framing, send the data frame to the management CPU1 To complete its related business, the protection CPU2 focuses on the operation of the protection logic; each sub-machine obtains the protection activation codes of other sub-machines, and determines whether to perform a protection action and make a protection exit through the comparison relationship between the sub-machine activation codes. The invention reduces the type selection cost of the CPU, improves the reliability of the protection action, fully satisfies the real-time performance, and has higher reliability at the same time.

Description

technical field [0001] The invention belongs to the technical field of power system distribution network automation, and in particular relates to a data transmission method of an in-situ protection device based on a double-ring network. Background technique [0002] With the implementation of the "three-in-one" localization scheme, the performance requirements of the local protection device have been greatly increased. Compared with the traditional protection device, the local protection device has higher integration and stronger reliability requirements. , Faster response. Accompanied by this is the increase in data volume, data processing time, and the number of ring network slaves, resulting in a significant increase in the load of the CPU-based data processing module. [0003] Most of the current on-site protection devices operate on a single machine, and use dual AD data (that is, analog data such as current and voltage collected by dual channels) to process the protec...

AI Technical Summary

Problems solved by technology

For distributed in-situ protection devices, the production cost of each sub-machine is very high, and the hardware is not completely independent.

[0005] Due to the limited cost of CPU selection, the current in-situ protection device has a relatively low main frequency, which leads to a sharp increase in CPU computing load and a decrease in reliability as the amount of data increases.

Images