On-line monitor device of lightning current of overhead transmission line based on PCI collection card

Abstract

An on-line monitor device of a lightning current of an overhead transmission line based on a PCI collection card is composed of a Rogowski coil, a trigger circuit, the high-speed PCI collection card, an industrial personal computer, a GPRS module, an energy absorption coil, a charging controller, a storage battery and a voltage changer. The monitor device is installed at a cross arm of a tower; non-contact type on-line monitoring is carried out on a three-phase insulator string on the power transmission line tower and a lightning line and a lightning arrester at the tower top; if the position near the monitored point is stricken by lightning, the Rogowski coil outputs induced voltage, the device begins to collect lightning current signals of each path, data are sent to a terminal computer through the wireless communication GPRS module, then states are evaluated, and a lightning strike fault point is located accurately. Due to the use of the high-speed PCI collection card, the sensitivity is high, and the lightning signals can be captured accurately.

Description

technical field [0001] The invention relates to a lightning current measuring device for a power transmission line and a lightning protection line. Background technique [0002] Lightning accidents on transmission lines bring huge losses to the power grid every year. Among 10kV-35kV equipment accidents, the proportion of lightning tripping times accounts for the first in the total number of tripping times of power transmission and distribution equipment, and the proportion of unplanned outages of power transmission and distribution equipment accounts for a large proportion. Second, it has seriously affected the safe and reliable operation of the power grid. Due to the uncertainty of the magnitude and direction of the lightning strike current, the same lightning protection system has different protection effects on different lightning strikes, and it is difficult to find the lightning strike fault point. Previous lightning current detection devices, such as Chinese patent CN...

AI Technical Summary

Problems solved by technology

[0002] Lightning accidents on transmission lines bring huge losses to the power grid every year. Among 10kV-35kV equipment accidents, the proportion of lightning tripping times accounts for the first in the total number of tripping times of power transmission and distribution equipment, and the proportion of unplanned outages of power transmission and distribution equipment accounts for a large proportion. The second place has seriously affected the safe and reliable operation of the power grid

Due to the uncertainty of lightning current amplitude and direction, the same lightning protection system has different protection effects for different lightning strikes, and it is difficult to find the lightning strike fault point

Previous lightning current detection devices, such as Chinese patent CN201087843Y "a lightning current detection device", cannot locate the time and amplitude of lightning strikes, let alone measure the lightning current waveform; Chinese patent CN101937015A "a lightning current and "On-line monitoring device for lightning voltage waveform parameters" needs to be installed on each wire, and the cost is high. Its technical route and the adoption of components are different from those of the present invention.

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