Transient overvoltage on-line monitoring system based on CVT and provided with built-in low-voltage capacitor

Abstract

The invention relates to a transient overvoltage on-line monitoring system based on a CVT and provided with a built-in low-voltage capacitor. The transient overvoltage on-line monitoring system is connected with a power grid and comprises a partial pressure sensor, a protector, a transient voltage collector and an industrial personal computer. The partial pressure sensor is a capacitor voltage transformer provided with a built-in non-inductive capacitor. The partial pressure sensor is connected with a power transmission line or a bus. The partial pressure sensor monitors voltage disturbance of the power grid in real time; the magnitude of voltages of all phases is transmits to the transient voltage collector through the protector; the magnitude of voltages of all the phases when a transient overvoltage occurs and waveforms and parameters before and after a failure are collected and saved by the transient voltage collector, and the transient voltage collector transmits collected signals to the industrial personal computer. The industrial personal computer gives out an alarm according to the collected signals and displays monitoring results. Compared with the prior art, the transient overvoltage on-line monitoring system based on the CVT and provided with the built-in low-voltage capacitor has the advantages of being high in stability and monitoring accuracy and beneficial to the improvement of the operational stability of the power grid.

Description

technical field [0001] The invention relates to an online monitoring technology of a power grid, in particular to a transient overvoltage online monitoring system based on a CVT built-in low-voltage capacitor. Background technique [0002] The transient process of the power grid is an important indicator of the operating state of the power grid. At present, the measurement or monitoring of the transient process of the ultra-high voltage power grid in East China is carried out by using an external voltage divider or the end screen of the bushing, except in the start-up and debugging room before the new equipment is put into operation. Except for a few temporary switching measurements, the monitoring of the transient process in the actual operation of the power grid has not yet started, and there is a lack of effective and feasible means for measurement or monitoring. [0003] At this stage, there are mainly three working modes of the overvoltage online monitoring voltage divi...

AI Technical Summary

Problems solved by technology

Mode 1 is affected by the transient performance of PT, and its accuracy is poor; Mode 2 is only suitable for low-voltage distribution networks such as 10kV and 35kV voltage level system overvoltage monitoring; Mode 3 can better meet the requirements of current engineering applications through capacitor voltage division. Requirements, but because the sensor is exposed outside the device, it is more suitable for startup and debugging, and it will be removed at the end of debugging

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