Method and system for modifying fixed value of dual protection screen

Abstract

The invention provides a method for modifying the fixed value of dual protection screens, which includes obtaining the modification order of the two protection screens; adjusting all the tripping outlet connectors on the first protection screen to the disconnected state, and sorting them on the second protection screen All the tripping outlet connecting pieces are in the input state; modify the fixed value on the first protection screen of the sorting, and after checking that all the tripping outlet connecting pieces are qualified, they are all adjusted to the input state; all the tripping on the second protective screen of the sorting The outlet connecting pieces are all adjusted to the disconnected state, and all the tripping outlet connecting pieces on the first sorting protection screen are in the input state; modify the setting value on the second sorting protective screen, and after checking that all the tripping outlet connecting pieces are qualified, All are adjusted to the input state. The implementation of the present invention can overcome the incorrect exit operation sequence of the trip outlet connecting piece or the phenomenon of switching on / off vacuum in the prior art, thereby effectively pre-controlling the risk of modifying the protection setting value and ensuring the safe and stable operation of the power grid.

Description

technical field [0001] The invention relates to the technical field of relay protection, in particular to a method and system for modifying the fixed value of a dual protection screen. Background technique [0002] According to the power system regulations, any power equipment operation must be protected by a relay protection device, so as to ensure that the system failure point can be effectively isolated in the event of an equipment system failure, so as to avoid large-scale power outage accidents in the power grid. [0003] At present, each power grid company configures dual relay protection devices for protection at intervals of the same operating power equipment with a voltage level above 220kV, so as to ensure accurate control of switch tripping to isolate the fault point when the primary equipment system fails, and realize safe and stable operation of the system. [0004] Such as figure 1 As shown, the dual relay protection device is usually equipped with a trip outl...

AI Technical Summary

Problems solved by technology

However, when the protection setting is modified, if the exit operation sequence of the trip outlet connecting piece is incorrect or there is a vacuum phenomenon (either full withdrawal or full investment) of the trip outlet connection piece, if the risk pre-control is not done well, it may cause It will lead to the withdrawal of the protection of the power grid for one fault, causing the switch to refuse to move and appearing unprotected, or it may cause the protection of the power grid to be put in for one fault protection, resulting in misoperation protection of the switch action, thus causing large-scale power outages in the power grid.

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