Sampling value display method and system based on optical digital sampling value relay protection device

Abstract

The invention discloses an optical digital sampling value relaying protection device-based sampling value display method and system. The system includes a channel sampling module, a soft strap state judging module and a protection sampling value module; the channel sampling module is used for receiving the amplitude and phase of relaying protection device optical digital input which accords with an IEC61850-9-2 sampling value; the soft strap state judging module is used for judging whether the switching-in of an MU is realized, when the MU is switched in, the state of a soft strap is 1, and when the switching-in of the MU is not realized, the state of the soft strap is 0; the protection sampling value module is used for receiving the amplitude and phase of relaying protection device optical digital input which accords with the IEC61850-9-2 sampling value when the state of the soft strap is 1, and the sampling value enters protection logic calculation; MU-switching-in soft strap state judgment is completed through software programs without manual participation required; and therefore, calculation results are reliable, sampling value display has high discrimination degree, and whether the interval MU soft strap is switched in can be clearly distinguished. The optical digital sampling value relaying protection device-based sampling value display method and system have the advantages of convenient operation, safe and efficient work of maintenance personnel and great application value.

Description

Technical field [0001] The invention relates to a sampling value display method and system based on an optical digital sampling value relay protection device. Background technique [0002] The voltage and current sampling in the domestic smart substation is realized by the merging unit. The merging unit completes the analog quantity sampling and converts it into the IEC61850-9-2 sample value transmission communication standard format optical signal, which is transmitted to the relay protection device through the optical fiber. According to Q / GDW441-2010 "Technical Specification for Relay Protection of Intelligent Substations", the requirements for relay protection devices: (Relay protection device) The protection device connected to two or more MUs should be set with "MU input" soft pressure plate according to MU. The protection measurement and control device controls whether the current and voltage of each channel are included in the protection logic calculation through the "MU ...

AI Technical Summary

Problems solved by technology

(Schematic as figure 2 ) In this method, the sampling value display on the panel before and after the "MU input" soft pressure plate exits the relay protection device has obvious changes, but the equipment operator cannot judge whether the sampling value is indeed zero at a certain interval or the channel setting caused by the "MU input" soft pressure plate exit. Zero, it is easy to cause frequent operations, wrong re-insertion after successful exit and other misoperations

[0007] Based on the above analysis, neither of the two display methods can enable equipment operators to simply and clearly judge the state of the MU input soft pressure plate, and the inconsistency will lead to confusion on the panel of the relay protection device, which will easily lead to the occurrence of false input and false exit of the MU soft pressure plate of the protection device , which brings hidden dangers to safe operation

Since the large-scale operation of smart substations, there have been many power outages in power grid enterprises due to the wrong switching of MU soft pressure plates, which have seriously affected the safe and stable operation of the power grid and the safe production of power consumers.

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