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T type wiring optical fiber longitudinal differential protection data synchronization method

A technology for optical fiber vertical difference protection and data synchronization, which is applied to emergency protection circuit devices, electrical components, etc., and can solve problems such as calculation deviations

Active Publication Date: 2018-05-18
NANJING INTELLIGENT APP
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Problems solved by technology

[0003] Aiming at the problems existing in the prior art, the object of the present invention is to provide a data synchronization method for T-connection light difference protection to solve the calculation deviation problem existing in the existing T-connection light difference data synchronization method

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  • T type wiring optical fiber longitudinal differential protection data synchronization method
  • T type wiring optical fiber longitudinal differential protection data synchronization method
  • T type wiring optical fiber longitudinal differential protection data synchronization method

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] The data synchronization method for T-type connection optical fiber longitudinal differential protection in this embodiment includes a data resampling module at the local side, a data sending module at the opposite side, a data receiving module at the opposite side, and a data resampling module at the opposite side. In this embodiment, the devices on the three sides of the T-connection have no master-slave distinction, each side is asynchronously sampled at equal intervals, and the frequency tracking function is performed on each of the three sides. The side reads the receiving buffer data in the interrupt, calculates the channel delay according to the time mark in the data frame, and maps the time mark of the opposite side data to the time axis of the device on the current side. Then, according to the data sampling time scale on both sides of th...

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Abstract

The invention relates to a T type wiring optical fiber longitudinal differential protection data synchronization method, including a local side data resampling module, an opposite side data sending module, an opposite side data receiving module and an opposite side data resampling module. Devices at three sides in T connection have no master-slave difference, nonsynchronous sampling at equal intervals is performed on the three sides, a frequency tracking function is performed separately at the three sides, and after frequency tracking resampling, local side data are sent to the two opposite sides immediately; at each side, buffering area data are read and received during interruption, channel delay is calculated according to the time scale in a data frame, and opposite side data time scales are mapped to a time shaft of a local side device. Then the corresponding historical interpolation moments of local side data is searched according to data sampling time scales of the two opposite sides, resampling is performed on the received data of the two sides, and the resampled data are filled in resampling serial number buffering areas corresponding to the historical moments. For a singledevice, data of the three sides have synchronous resampling serial numbers, and current differential data are calculated according to the sampling serial number of each side to be used for protectioncalculation.

Description

technical field [0001] The invention belongs to the technical field of power system automation, and in particular relates to a data synchronization method for a line optical fiber longitudinal differential protection device. Background technique [0002] T-type connection optical difference protection is also called three-terminal optical difference protection. It needs to receive data from both sides of the other party at the same time, and process the data on the three sides synchronously, and calculate the differential current of the three sides for protection calculation. At present, the more mature data synchronization method for T-connection differential is to adjust the sampling interval synchronization method. That is, one side is the main side, and the other two sides are the slaves. The synchronization method of the T-connected optical differential protection differential data is based on one side, and the slave side is based on the master side. Adjust the sampling...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 张杭陈国富张燕
Owner NANJING INTELLIGENT APP
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