Method for sampling and processing transmission data with transmission line optical-fiber longitudinal difference protection
A technology for optical fiber longitudinal differential protection and power transmission lines, which is applied in the direction of electrical signal transmission systems, circuit devices, signal transmission systems, etc., can solve the problems of reduced protection sensitivity, difficult fault analysis, and inability to correct errors, and achieves high synchronous sampling accuracy, The effect of convenient fault analysis and improved protection sensitivity
Active Publication Date: 2007-11-21
NANJING PANENG TECHNOLOGY DEVELOPMENT CO LTD
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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
Method used
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[0052] Example: After the synchronization is completed, the slave transmits the data of the current sampling point of the machine to the host, and the host calculates the current and voltage of the host and the phase and amplitude of the three-phase current transmitted by the slave, and displays it in real time, calculates the differential current, and protects the A split-phase ratio differential is used. When there is a fault, start the recorder to record the host information and the three-phase current data of the slave. When the host detects that there is only one bit error in two cycles, the average algorithm is used to correct the error data.
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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 coding 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 synch...
Claims
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IPC IPC(8): H02J13/00G08C19/00G08C19/16H02H7/26H02H3/34
CPCY04S40/143Y02E60/7884Y02E60/00
Inventor 刘设计
Owner NANJING PANENG TECHNOLOGY DEVELOPMENT CO LTD
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