Voltage online monitoring device for power system

Abstract

The invention discloses a voltage online monitoring device for a power system. A high-voltage capacitive voltage divider is connected with a bus-bar and operated in the grid to divide the voltage of the bus-bar for the first time, a low voltage arm signal is transmitted to a secondary resistance-capacitance divider through a first coaxial cable, the secondary resistance-capacitance divider carries out secondary voltage division on the low voltage arm signal, the voltage signal at the low voltage side is transmitted to a high-speed data acquisition card to be subjected to A / D conversion through a second coaxial cable, and then the obtained digital signal is transmitted to an industrial personal computer to be judged, stored and analyzed; the high-voltage capacitive voltage divider, the secondary resistance-capacitance divider, the high-speed data acquisition card and the industrial personal computer are respectively grounded. The voltage online monitoring device for the power system can reach the sampling rate per channel of 7.5 MS / s, can run in the grid for long time, is low in power consumption and convenient to maintain, can track and record various over-voltage and voltage dip waveforms in an online manner, has various analysis and waveform processing functions, and provides scientific basis for the safe and reliable running of the power system.

Description

technical field [0001] The invention relates to the field of on-line monitoring of power systems, in particular to a power system voltage on-line monitoring device based on a PCI-1714UL high-speed data acquisition card, which is used for monitoring, recording and analyzing various electromagnetic transient faults of the power system. Background technique [0002] Operation experience shows that in a 10kV power system, various voltages, including internal overvoltage and lightning overvoltage, have a high accident rate, and the duration, amplitude, waveform, cause and effect on insulation of various overvoltages are also different. Are not the same. Although a large number of overvoltage protection devices such as lightning arresters are installed in practice, when an overvoltage accident occurs in the system, it is difficult to determine whether the cause of the accident is due to the overvoltage amplitude or steepness exceeding the bearing capacity of the equipment, or the ...

AI Technical Summary

Problems solved by technology

[0004] On-line monitoring technology is an emerging technology that has developed very rapidly in recent years and has been widely used in power systems. However, all kinds of voltage on-line monitoring devices developed at home and abroad can generally only monitor the internal overvoltage of the power system, or monitor the sampling The rate cannot reach 7.5MS / s per channel, and the existing device has a single function and is not complete

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