On-line overvoltage monitoring system based on lightning surge current of lightning arrester
A technology of lightning impulse and monitoring system, applied in the direction of measuring current/voltage, instruments, measuring devices, etc., can solve the problems that have not been used and affect the reliability of system operation, and achieve the effect of safe and reliable operation
Inactive Publication Date: 2013-09-18
STATE GRID CORP OF CHINA +1
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Problems solved by technology
However, these methods are still in their infancy, and need to add equipment on the high-voltage side, design special bushing taps, etc., which affect the reliability of the system operation. These overvoltage online monitoring methods are mainly used in distribution networks. monitoring is currently not in use
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[0031] Taking the metal oxide surge arrester with a rated voltage of 51kV gapless in a 35kV power system as an example, the iron-free self-integrating Rogowski coil is used as the current sensing head to measure the lightning impulse current of the zinc oxide arrester in real time, and the measured data is collected through USB high-speed data acquisition. The card collects, and then transmits to the computer record and display system through the USB optical fiber transmission system. The computer record and display system obtains the parameters of current amplitude and wave head time. The records show that the system calculates the surge arrester node voltage under the condition of operating surge current to be 147.32kV, and the arrester node voltage is 138.93kV measured using a high-voltage divider, and the error is within 5%. Realize real-time online monitoring of the overvoltage of arrester nodes. Through the computer recording and displaying the arrester node voltage disp...
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The invention discloses an on-line overvoltage monitoring system based on the lightning surge current of a lightning arrester. The system comprises a front-end sensor, a USB (universal serial bus) high-speed data acquisition card, a USB optical fiber transmission system and a computer recording and display system which are sequentially connected; the front-end sensor is arranged at a lightning arrester node of a transformer substation, and is used for collecting the lightning surge current of the lightning arrester in real time; the USB high-speed data acquisition card acquires the electric signal outputted by the front-end sensor in real time, and transmits the electric signal to the computer recording and display system via the USB optical fiber transmission system, and the computer recording and display system works out and displays the voltage of the lightning arrester node according to the obtained lightning surge current of the lightning arrester and wave head time. The system can effectively monitor overvoltage in a power system without requiring the addition of equipment, the change of equipment structures or the adoption of specially designed bushing taps and other measures in the power system, and can come up to the requirement of the power system on the safety and reliability of operation.
Description
technical field [0001] The invention belongs to the technical field of overvoltage monitoring of ultra-high voltage and ultra-high voltage transmission systems, and in particular relates to a system for realizing on-line overvoltage monitoring of super- and ultra-high voltage transmission system substations and transmission line voltages based on the operating current of lightning arresters. Background technique [0002] Most of the various accidents in the power grid are caused by overvoltage in the system. However, when an overvoltage accident occurs in the system, often due to the lack of effective monitoring means, it is impossible to determine whether the cause of the accident is the overvoltage amplitude or steepness exceeding the withstand capacity of the equipment, or the insulation level of the equipment is reduced, which makes analysis and judgment become difficult. It is very difficult to come up with effective countermeasures. The realization of overvoltage moni...
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IPC IPC(8): G01R19/165
Inventor 王森胡攀峰牛博黄国强蒲路郭洁
Owner STATE GRID CORP OF CHINA