Method for detecting electric network fault transient travelling wave signal

Abstract

The invention relates to a power network transient-cause forced outage travelling wave signal detection method, belonging to the field of power system. The method is that an opening-typed special travelling wave sensor is arranged on a shell grounding wire of the transformer of a transformer substation and used for detecting the power network transient signal; the power network transient-cause forced outage travelling signal is judged according to the arising time and amplitude of the transient signal and the exact time and polarity used for the arrival of the travelling wave signal are recorded. The opening-typed special travelling wave sensor of the invention can detect the forced outage travelling wave signals of all wires at high voltage side, low voltage side and middle voltage side of the transformer of the transformer substation, thus having simple realization and facilitating generalization.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis of a high-voltage transmission network, and in particular relates to a detection method for a fault transient traveling wave signal of a power grid. Background technique [0002] Transient traveling wave signal detection of power grid fault is the key to fault traveling wave location and protection of transmission line. Most of the existing transient traveling wave signal detection methods extract the traveling wave signal from the secondary side of the current transformer, judge the fault traveling wave signal through high-speed acquisition and software detection, record the arrival time of the fault traveling wave, and measure the transient state of each outgoing line Electric current, detection device is complicated, and cost is high. For this reason, the related technologies of extracting the transient voltage traveling wave of power grid for fault location by traveling wave sensor ha...

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Problems solved by technology

The invention patent with the application number 200510102444.7 titled "Traveling wave fault location device for transmission line with time-division multiplexing sampling" discloses an analog sampling method for each data acquisition channel by using high sampling rate A / D under the condition of time-division multiplexing. method, this method has high positioning accuracy and good reliability; however, the device has a complex hardware and software structure, and needs to be equipped with a high-speed acquisition card and special data analysis software for traveling wave morphology, and the cost of the equipment is high, which is not easy to popularize and apply

The invention patent with the application number 00131128.x titled "Power Line Protection Method and Traveling Wave Sensor Used in the Method" discloses a method of using a traveling wave sensor to detect fault transient traveling wave signals for power line protection and fault location. The traveling wave sensor in this method can detect voltage and current traveling waves, and the detection effect is good, but the traveling wave sensor can only detect the fault traveling wave signal of a voltage level line, and the installation is more complicated

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