Fiber channel cyclic redundancy check (CRC) method for longitudinal protection

Abstract

The invention relates to a fiber channel sectionalized cyclic redundancy check (CRC) method for longitudinal protection. The method comprises that: when data is transmitted, a transmitter divides data information to be transmitted into a plurality of data sections, wherein a CRC code with a bit length equal to that of an information code is appended in each data section; and after receiving the data, a receiver performs conversion check on each data section according to the CRC code, discards data sections with errors when detecting the errors, and continues using data without any error. By the sectionalized CRC method, the CRC code and the information code have the equal bit length, so error codes of any form can be detected and an error detection rate is 100 percent. The transmission can be ensured to be absolutely reliable, so longitudinal fiber distance protection and remote tripping protection can act after a frame of signal is received, and the acting speed of the protection is further increased. Simultaneously, due to the adoption of the sectionalized CRC method, when a certain data section has the errors, the usage of the other data sections is not influenced, so the error resilience of a fiber channel can be greatly improved, and the acting speed of the protection can be increased.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and relates to a CRC checking method of an optical fiber channel for longitudinal protection. Background technique [0002] The main longitudinal protection of the high-voltage transmission line of the power system needs to complete the data exchange of the protection devices at both ends by means of the channel, so as to achieve the purpose of fast action of the whole line. [0003] At present, the high-voltage line protection with the help of optical fiber channel mainly includes: optical fiber differential protection and optical fiber distance protection. The optical fiber distance protection sends the local protection discrimination signal through the optical fiber channel. This signal determines whether to allow the peer protection to trip, so fast and reliable transmission Discriminating the signal becomes the key to whether the optical fiber distance protect...

AI Technical Summary

Problems solved by technology

[0004] Conventional longitudinal fiber channel data transmission formats and verification methods have poor error detection capabilities and a high rate of missed detection, and when errors are detected, the position of the error cannot be located. Therefore, optical fiber distance protection and long-hop The protection adopts the method of delay tripping to prevent the influence of error codes on itself, and the delay tripping switch directly leads to the extension of the fault existence time, which affects the stable operation of the power grid and also causes great economic losses.

Images