Ground wire state on-line monitoring device based on indirect current injection technology

Abstract

The invention provides a ground wire state on-line monitoring device based on an indirect current injection technology. The ground wire state on-line monitoring device comprises a signal injection unit, a signal acquisition unit, a signal processing unit, a control processing unit, a display unit, a storage unit, an alarm unit and a communication unit. The ground wire state on-line monitoring device injects a current signal into the ground wire, then collects a voltage signal of the injected signal and an induction current signal of the ground wire, calculates the resistance of a grounding loop, and further judges whether the state of the ground wire is normal or not. According to the ground wire state on-line monitoring device based on the indirect current injection technology, the working state of a grounding wire can be accurately determined in real time, personal safety and equipment safety of maintenance personnel are guaranteed, and safe and stable operation of an electric power system is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of electric power detection, and in particular relates to an on-line monitoring device for ground wire status based on indirect current injection technology. Background technique [0002] Reliable grounding during the maintenance of electrical equipment, and clearing the grounding point after the maintenance work is completed are important measures to ensure the safety of the maintenance personnel and equipment, and to ensure the safe and stable operation of the power system. Due to factors such as residual charge and induction of adjacent equipment or lines, there will be a voltage that endangers the personal safety of the maintenance personnel. The reliable grounding of the equipment and lines to be repaired can discharge the residual charge, and the connection of the ground wire is indispensable for the protection of the maintenance personnel. It is the lifeline of electric power employees. [0003] The ...

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Problems solved by technology

[0005] (1) It can only judge whether the line has been installed or missed (not dismantled) grounding, but it cannot realize the digital online monitoring of the grounding resistance of the grounding wire, and cannot further judge whether the grounding effect is good, whether the grounding is effective, and the specifics of the abnormal grounding wire Location

[0006] (2) Due to the lack of online monitoring means, during the construction process, when problems such as grounding wire loosening and disconnection occur, they cannot be found in time

[0007] (3) When the maintenance work is completed, if there is a ground wire that has not been removed, the system cannot inform the maintenance personnel that the ground wire has not been removed and its specific location, nor can it judge the existence of unplanned short-circuit points

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