Distance back-up protection setting method of ultrahigh voltage circuit

Abstract

The invention discloses a distance back-up protection setting method of an ultrahigh voltage circuit. The distance back-up protection setting method of the ultrahigh voltage circuit comprises the following steps of: (1) carrying out three-section configuration on grounding distance spare protection and phase-to-phase distance protection respectively; and enabling each section of the grounding distance spare protection and the corresponding section of the phase-to-phase distance protection to use the same constant value; (2) setting the I section of the grounding distance spare protection by reliably avoiding metal faults occurring outside an area, so as to obtain a constant value of the I section of the grounding distance spare protection and a constant value of the I section of the phase-to-phase distance protection; (3) dividing the setting of the II section and the III section of distance spare protection into the setting of the II section or the III section of standard side distance spare protection and the setting of the II section or the III section of non-standard side distance spare protection according to a datum mark, so as to respectively obtain the constant value of the III section of the grounding distance spare protection and the constant value of the III section of the phase-to-phase distance spare protection. On the premise of not reducing security risk of a power grid, the adaptation capability of a spare protection constant value to an operation manner of the power grid is improved, and the working capacity of setting calculation is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a method for setting backup protection of ultra-high voltage line distance. Background technique [0002] Relay protection is one of the most important secondary devices in the power system, and it plays an extremely critical role in the safe and stable operation of the system. Line protection is used to automatically and quickly cut off the faulty line and isolate the fault after a fault occurs in the power grid, so as to ensure the safety of people and equipment and the normal operation of the non-faulty part. The main protection of the line trips the circuit breaker without delay when there is a fault, cuts off the line, and isolates the fault. The back-up protection of the line is used to trip the circuit breaker of this line or other lines to isolate the line fault when the main protection of the line fails or the circuit breaker f...

AI Technical Summary

Problems solved by technology

Second, with the rapid development of the power grid, the structure and operation mode of the power grid are changing extremely rapidly. The complex setting principles make the setting calculation of the backup protection very difficult. Insufficient sensitivity has become a hidden danger to the safety of the power grid

[0004] Therefore, the current distance backup protection setting method restricts the flexible adjustment of the power grid operation mode, the mismatch between the protection settings, and the frequent changes of the settings bring unpredictable potential risks to the system, and also greatly increase the setting. Calculator Workload

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