A Calculation Method for On-line Setting of Relay Protection

Abstract

The invention discloses an online setting calculation method for relay protection. The method comprises the following steps: carrying out online verification on the agility, the selectivity and the load-hiding capacity according to the online operating mode and the relay protection filed operating constant value of a power grid, wherein the constant value set is taken as an initial online setting calculation range; combining the online operating mode and carrying out online setting calculation by virtue of a setting calculation formula to obtain a calculated constant value; acquiring a limited value of the constant value in the calculation range by adopting the setting calculation formula according to constraint conditions matched with superior protection; and judging whether the calculated constant value is greater than the limited value or not, if so, ending, and if not, classifying the constant value of the superior protection into the online setting calculation range for re-calculating. According to the method disclosed by the invention, the online setting calculation range is quickly identified through online verification and early warning, the online setting calculation for the relay protection constant values in a full grid with potential safety hazards is quickly realized, so that problems in the prior art are avoided, workers can immediately make a constant value optimizing policy, and the operating risk of the power grid is effectively lowered.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and more specifically relates to an online setting calculation method for electric power system relay protection fixed value taking into account upper-level limit values. Background technique [0002] Relay protection is one of the most important secondary equipment in the power system, and it is the guarantee for the safe operation of the power system. Whether the relay protection device can meet the "four characteristics" requirements proposed by the power grid depends largely on whether the relay protection setting is reasonable. At present, the relay protection setting values ​​are obtained offline and remain unchanged during system operation. However, the operation mode of the power system is constantly changing in actual operation. When the power grid is in some special operating states due to equipment maintenance, new project commissioning and power grid ac...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides an online setting method for relay protection, the purpose of which is to quickly and accurately perform online setting calculations in consideration of the upper-level protection limit value, thereby solving the problem of existing setting calculations. The method does not meet the requirements for cooperation with the upper-level line protection, resulting in the technical problem that the results of the setting calculation cannot be directly sent to the site of the protection device

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