Optical fiber blocking override-avoiding tripping system

Abstract

The invention discloses an optical fiber blocking override-avoiding tripping system and a blocking signal processing method for realizing an override avoiding function. The system comprises two types of devices, the first type is microcomputer synthetic protective devices PA 61 with the override-avoiding tripping function, and the second type is override-avoiding optical fiber hubs SU20. Optical blocking signals are used for connection blocking among the microcomputer synthetic protective devices and between the microcomputer synthetic protective devices and the override-avoiding optical fiber hubs. The states of the signals comprise a normal working state and 1-10 levels of time delay blocking states. The states of the signals are distinguished according to different frequencies of the signals. The frequencies of the signals are generated by an FPGA (Field Programmable Gate Array), and the FPGA outputs blocking signals with different widths to a DSP (Digital Signal Processor) when the FPGA communicates with the DSP. The system can realize the override-avoiding tripping of an upper level power supply system and a lower level power supply system, and can also realize multi-point concentration. The override-avoiding tripping is realized by the mode of unified blocking signal sending.

Description

technical field [0001] The invention is an anti-overstepping tripping system. In the multi-level power supply system, especially for the characteristics of short power supply distance, small protection interval and variable operation mode of the underground power supply system, the fiber optic blocking signal is used to effectively block the current protection of the entire line to prevent skipping trips. Background technique [0002] At present, most relay protection devices are implemented by using optical fiber differential protection to prevent over-level tripping on the ground, but for underground anti-over-level tripping, there are very few microcomputer protection devices with anti-over-level tripping functions, and the protection devices basically rely on Line longitudinal differential protection and bus differential protection cooperate to prevent over-level tripping. Since the power system is not a static system, its operation mode will change, and the priority le...

AI Technical Summary

Problems solved by technology

If it is only a simple one-to-one one-way blocking of the fixed contact line, when the operation mode is changed, the incoming line of the lower line will be changed. If the blocking setting is not changed, it will not be able to effectively prevent the skipping trip; some intelligent measurement and control The terminal adopts the software configuration method, and the priority of the switch can be configured on the ground monitoring platform, but as long as the line operation mode changes, the priority of the corresponding switch must be reset, and the operation is quite cumbersome

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