Adaptive line section leakage protection system and method for three-phase non-reliability grounding system

Abstract

The invention relates to an adaptive line section leakage protection system and method for a three-phase non-reliability grounding system. On the basis of a power direction detection-based leakage protection unit, an adaptive characteristic collection unit is added; and when a power grid structure is changed, leakage characteristic parameters are captured through the adaptive characteristic collection unit and circuit parameters are adjusted to adapt the leakage protection unit, so that the problem of power direction detection-based leakage protection failure when the power grid system structure is changed can be solved.

Description

technical field [0001] The invention relates to the field of leakage protection, in particular to an adaptive line selection leakage protection system and method for a three-phase non-reliable grounding system. Background technique [0002] The three-phase unreliable grounding system is mostly used in industrial and mining enterprises. These units have high requirements for power reliability, and generally the production environment of these enterprises is complex, and there are more or less flammable and explosive gases or various dusts. Necessary safety measures should be taken for leakage faults that may generate sparks or endanger the lives of personnel. Once a leakage fault occurs, the faulty branch should be cut off in time to prevent the fault from expanding. Current leakage detection methods used in three-phase unreliable grounding systems include: additional DC method, zero-sequence voltage method, zero-sequence power direction method, etc. Among them, if the leaka...

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