Overvoltage on-line monitoring device and method

Abstract

The invention relates to the field of an electric power system and particularly relates to an overvoltage on-line monitoring device and method. The device comprises a voltage transformer connected with a high-voltage bus, a capacitive divider connected with the voltage transformer through a cable, a data collection card connected with the capacitive divider and an industrial control computer connected with the data collection card. The method comprises: (1), utilizing a voltage transformer carried by a transformer station itself to acquire voltage signals on a high-voltage bus; (2), transmitting the acquired voltage signals through a cable, next, performing voltage dividing again through a divider, then forming sampling signals by using a data collection card to perform sampling, and sending the sampling signals to an industrial control computer; and (3), the industrial control computer converting the sampling signals into voltages at the high-voltage side of the voltage transformer by use of an inversion calculating method combining time domain recursion convolution and a vector coupling method. By using the system provided by the invention, the cost is low, and the safety is high.

Description

technical field [0001] The invention relates to the field of power systems, in particular to an overvoltage online monitoring device and method. Background technique [0002] Modern power system operation experience and research have shown that overvoltage is the main cause of grid insulation damage accidents, and is also a decisive factor in selecting the insulation strength of electrical equipment. Although the power system has a series of overvoltage protection measures such as lightning rods, lightning wires, lightning arresters and lightning protection grounding (grounding grid), overvoltage phenomena still occur from time to time and cause a series of accidents such as breakdown, discharge, flashover, and explosion of electrical equipment. . Overvoltage online monitoring can realize online capture and real-time analysis of overvoltage waveforms, and provide real first-hand data for overvoltage accident inversion and treatment and numerical simulation research. Theref...

AI Technical Summary

Problems solved by technology

[0003] The methods for acquiring voltage signals of overvoltage on-line monitoring devices in the prior art mainly include capacitive voltage divider or resistance-capacitance voltage divider, optical fiber voltage sensor, end-screen voltage sensor based on capacitive bushing, and non-contact type based on electrostatic coupling principle. Voltage sensors, etc., these methods need to install voltage sensors on the primary side of the online monitoring system, and also need to install communication equipment between the site and the control room, which not only reduces the safety of the primary system, but also increases the cost of communication equipment

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