Method for sampling and processing transmission data for protecting transmission line optical-fiber longitudinal difference

Abstract

The method comprises: processing fiber differential signals from master machine and slave machine side; the slave machine sends out the message format, and the transmitted data is the unprocessed real time sampling point data, the bus voltage of slave machine side and the bus negative sequence voltage; the master machine sends the failure information of slave machine differential protection, and the slave machine side simultaneously reports the protection signals used for realizing the voltage-locking at both side of differential protection; Ia,Ib,Ic are the data of three phase current sampling point of slave machine side; the master machine receives the sampling data of three phase current sent from the slave machine, and compares the data with its own three phase current in order to calculate the differential current; the differential protection uses the split-phase type ratio differential protection, and based on the feature of line failure, uses the both side voltage locking differential protection.

Description

technical field [0001] The invention relates to nanosecond-level precision synchronous sampling control and high-speed data transmission technology, which is used to realize transmission line optical fiber longitudinal difference protection, transmit sampling point raw data and process the sampled raw data. In particular, the longitudinal difference protection of optical fiber is realized by using the synchronous sampling control and data transmission technology based on encoding and decoding. Background technique [0002] The existing data transmission and processing methods of line optical fiber differential protection are described as follows: [0003] The current differential protection based on optical fiber communication provides a good solution for the relay protection of the line. The key technology is to solve the communication problems at both ends of the line, that is, how to sample synchronously, obtain reliable opposite-side data, how to adjust after losing syn...

AI Technical Summary

Problems solved by technology

[0006] 2. The master side cannot monitor the phase of the slave side current, which brings inconvenience to commissioning and debugging

[0007] 3. When a fault occurs, the wave recording function of the devices on both sides can only record their respective sampling currents, which brings difficulties to fault analysis

[0008] 4. For the bit error caused by the channel, it can only be monitored, and the current transmission current data is discarded, and the error cannot be corrected, which reduces the protection sensitivity

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