Judging method and device of overvoltage in power grid

Abstract

The invention discloses a judging method and device of overvoltage in a power grid. The method comprises the following steps of measurement equipment arrangement, wherein measurement equipment for measuring three-phase information and grounded circuit information in real time is arranged in a three-phase circuit and a grounded circuit respectively, and the measurment equipment includes first measurement equipment, second measurement equipment, third measurement equipment and fourth measurement equipment; data collection, wherein current which passes the first measurement equipment, the secondmeasurement equipment, the third measurement equipment and the fourth measurement equipment is collected respectively to obtain Ia, Ib, Ic and Io; overvoltage judgement, wherein according to comparison of numeric values of Ia, Ib, Ic and Io at the same time, whether or not an overvoltage phenomenon exists is judged. The method is simple and has the concise steps.

Description

technical field [0001] The invention belongs to the technical field of judging overvoltage in a power grid, and in particular relates to a judging method and device for overvoltage in a power grid. Background technique [0002] At present, there are various types of overvoltage protection devices on the market, all of which have unsatisfactory effects and functions that cannot meet the safety requirements of power grid operation. [0003] In the overvoltage protection device in the prior art, for different types of overvoltage such as operating overvoltage, resonance overvoltage, single-phase intermittent arc grounding overvoltage, lightning overvoltage, etc., there are missed detections and false detections from the protection of the microcomputer. , False detection and missed negative, false negative, false negative and other hidden dangers. [0004] At the same time, in the prior art, it is judged for a long time, and it is determined as an overvoltage phenomenon. This ...

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Problems solved by technology

[0002] At present, there are many kinds of overvoltage protection devices on the market, and their effects are not ideal, and their functions cannot meet the safety requirements of power grid operation.

[0003] In the overvoltage protection device in the prior art, for different types of overvoltage such as operating overvoltage, resonance overvoltage, single-phase intermittent arc grounding overvoltage, lightning overvoltage, etc., there are missed detections and false detections from the protection of the microcomputer. , False detection and missed negative, false negative, false negative and other hidden dangers

[0004] At the same time, in the prior art, it is judged for a long time, and it is determined to be an overvoltage phenomenon

This kind of long-term data judgment takes a long time. At the same time, it is too late to find overvoltage, which is very inconvenient to use.

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