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Fault transient protection method for electric transmission line

A technology for power transmission lines and transient protection, applied in emergency protection circuit devices, electrical components, etc., can solve the problem of low reliability, and achieve the effect of easy promotion, simple and easy implementation, and broad application prospects.

Active Publication Date: 2016-03-02
湖南深能智能科技有限公司
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AI Technical Summary

Problems solved by technology

[0003] Aiming at the current situation that the reliability of the existing transmission line fault transient protection method is not high, the present invention proposes a new transmission line fault transient protection method

Method used

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  • Fault transient protection method for electric transmission line
  • Fault transient protection method for electric transmission line
  • Fault transient protection method for electric transmission line

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Embodiment Construction

[0024] see figure 1 , figure 1 It is a structural diagram of a power grid implementing the present invention, which is a typical 500kV high-voltage transmission line model. figure 1 Among them, P, M, N, and Q are four substations, l 1 , l 2 , l 3 There are three 500kV high-voltage transmission lines with lengths of 60km, 100km and 50km respectively. agreed transmission line l 2 For the protected line, in the transmission line l 2 The protection device 1 is installed at the substation M at the end, which is a reverse out-of-area fault, an in-area fault, and a forward out-of-area fault. Simulation analysis of the adaptability of the transmission line fault transient protection method in various fault situations, first, in the transmission line l 2 Set a sample fault point every 500 meters, simulate various faults at all sample fault points, detect the simulated fault transient waveform, and establish a fault transient waveform sample database.

[0025] Select a typ...

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Abstract

The invention discloses a fault transient protection method for an electric transmission line. The fault transient protection method comprises the following steps: mounting a protection device at one end of the electric transmission line; arranging sample fault points on the electric transmission line at certain intervals; simulating various fault conditions at all the sample fault points; mounting a transient signal detection device at the end of the electric transmission line to detect the fault transient wave forms of all the simulated fault conditions and building a fault transient wave form sample database T; detecting the transient wave form of a fault when the electric transmission line gets out of order at one end of the electric transmission line, and carrying out wave form relativity analysis between the transient wave form and all fault transient wave forms in the fault transient wave form sample database T to calculate a wave form related coefficient k; judging whether the fault is an internal fault or an external fault according to the difference between wave form related coefficients, and sending out a tripping instruction to insulate fault when the fault is an internal fault, otherwise, locking the protection device. The method can be used for judging whether the fault is an internal fault or an external fault accurately, so as to further improve the reliability and the practicability of transient protection.

Description

technical field [0001] The invention belongs to the field of relay protection of electric power systems, and relates to a fault transient protection method of transmission lines. Background technique [0002] With the comprehensive construction of the smart grid, the power system puts forward higher requirements for the reliability, rapidity, selectivity and sensitivity of relay protection, so there is an urgent need for ultra-high-speed and high-reliability relay protection devices as a guarantee The first line of defense for the safe and stable operation of the power system after a transmission line fault. Transient protection technology has unique advantages such as fast action speed and no influence from transition resistance, current transformer saturation, system oscillation and distributed capacitance of long lines, and has become a research hotspot in the field of relay protection at home and abroad. At present, the protection principles that use fault transient wav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/226H02H7/26
Inventor 李泽文范彩兄郭田田赵廷刘柏罕
Owner 湖南深能智能科技有限公司
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