Processing method and system for relay protection setting value of nuclear power plant generator-transformer unit

Abstract

The invention discloses a method and system for processing the relay protection setting value of a nuclear power plant generator-transformer unit. The method for processing the relay protection setting value of the nuclear power plant generator-transformer unit includes the following steps that S1, a first initial setting value of the main transformer zero-sequence differential slope of a generator of the generator-transformer unit and a second initial setting value of differential protection second harmonic intersecting lock time are collected; S2, the actuation time T1 of a main transformer zero-sequence differential protection switch is detected, when T1 is larger than a preset value T, the first initial setting value is optimized, and the actuation time T1 of the main transformer zero-sequence differential protection switch is made to be smaller than the preset value T; whether three-phase second harmonic attenuation time constants of the generator are the same or not is detected, when the three-phase second harmonic attenuation time constants are not the same, the second initial setting value is optimized, and the three-phase second harmonic attenuation time constants are made to be the same; S3, the optimized initial setting value is sent to a control system of the generator-transformer unit. The method and system have the advantage that the stability and the safety of the generator-transformer unit are improved.

Description

Technical field [0001] The invention relates to the field of nuclear power, and more specifically, to a method and system for processing the setting value of the relay protection of the generator-transformer group of a nuclear power plant. Background technique [0002] The setting of the relay protection of generator and transformer group (generator-transformer group protection for short) in nuclear power plants is very important. The correctness of the protection setting will seriously affect the safe operation of the power plant and the system. However, some generator-transformer protection settings are not completely calculated in accordance with the calculation guidelines for large-scale generators and transformers relay protection setting calculations, and there is a large reserve current protection setting value for generator 100% stator grounding protection and zero sequence of the main transformer. The differential slope setting value is too large, the setting value of th...

AI Technical Summary

Problems solved by technology

However, some generator-transformer protection settings are not fully set according to the calculation guidelines for large-scale generator transformer relay protection setting calculations, and there are backup current protection settings for 100% stator grounding protection of generators that are too large, and main transformer zero sequence The setting value of the differential slope is too large, the setting value of the second harmonic cross-blocking time of the main plant transformer is unreasonable, and the setting value of the out-of-step protection characteristic range of the generator is unreasonable; The malfunction of the relay protection unit will affect the normal operation of the generator-transformer unit, and even fail to act when a fault occurs, causing serious accidents to the power plant of the nuclear power plant

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